Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext3/inode.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/inode.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
| 15 | * Goal-directed block allocation by Stephen Tweedie |
Dave Kleikamp | e9ad562 | 2006-09-27 01:49:35 -0700 | [diff] [blame] | 16 | * (sct@redhat.com), 1993, 1998 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 18 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 19 | * 64-bit file support on 64-bit platforms by Jakub Jelinek |
Dave Kleikamp | e9ad562 | 2006-09-27 01:49:35 -0700 | [diff] [blame] | 20 | * (jj@sunsite.ms.mff.cuni.cz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | * |
| 22 | * Assorted race fixes, rewrite of ext3_get_block() by Al Viro, 2000 |
| 23 | */ |
| 24 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include <linux/highuid.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/quotaops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/writeback.h> |
| 28 | #include <linux/mpage.h> |
Duane Griffin | b5ed311 | 2008-12-19 20:47:14 +0000 | [diff] [blame] | 29 | #include <linux/namei.h> |
Al Viro | 4613ad1 | 2012-03-29 22:30:07 -0400 | [diff] [blame] | 30 | #include "ext3.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "xattr.h" |
| 32 | #include "acl.h" |
| 33 | |
| 34 | static int ext3_writepage_trans_blocks(struct inode *inode); |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 35 | static int ext3_block_truncate_page(struct inode *inode, loff_t from); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | |
| 37 | /* |
| 38 | * Test whether an inode is a fast symlink. |
| 39 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 40 | static int ext3_inode_is_fast_symlink(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | { |
| 42 | int ea_blocks = EXT3_I(inode)->i_file_acl ? |
| 43 | (inode->i_sb->s_blocksize >> 9) : 0; |
| 44 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 45 | return (S_ISLNK(inode->i_mode) && inode->i_blocks - ea_blocks == 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | } |
| 47 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 48 | /* |
| 49 | * The ext3 forget function must perform a revoke if we are freeing data |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | * which has been journaled. Metadata (eg. indirect blocks) must be |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 51 | * revoked in all cases. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | * |
| 53 | * "bh" may be NULL: a metadata block may have been freed from memory |
| 54 | * but there may still be a record of it in the journal, and that record |
| 55 | * still needs to be revoked. |
| 56 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 57 | int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode, |
Mingming Cao | 1c2bf37 | 2006-06-25 05:48:06 -0700 | [diff] [blame] | 58 | struct buffer_head *bh, ext3_fsblk_t blocknr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | { |
| 60 | int err; |
| 61 | |
| 62 | might_sleep(); |
| 63 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 64 | trace_ext3_forget(inode, is_metadata, blocknr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | BUFFER_TRACE(bh, "enter"); |
| 66 | |
| 67 | jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, " |
| 68 | "data mode %lx\n", |
| 69 | bh, is_metadata, inode->i_mode, |
| 70 | test_opt(inode->i_sb, DATA_FLAGS)); |
| 71 | |
| 72 | /* Never use the revoke function if we are doing full data |
| 73 | * journaling: there is no need to, and a V1 superblock won't |
| 74 | * support it. Otherwise, only skip the revoke on un-journaled |
| 75 | * data blocks. */ |
| 76 | |
| 77 | if (test_opt(inode->i_sb, DATA_FLAGS) == EXT3_MOUNT_JOURNAL_DATA || |
| 78 | (!is_metadata && !ext3_should_journal_data(inode))) { |
| 79 | if (bh) { |
| 80 | BUFFER_TRACE(bh, "call journal_forget"); |
| 81 | return ext3_journal_forget(handle, bh); |
| 82 | } |
| 83 | return 0; |
| 84 | } |
| 85 | |
| 86 | /* |
| 87 | * data!=journal && (is_metadata || should_journal_data(inode)) |
| 88 | */ |
| 89 | BUFFER_TRACE(bh, "call ext3_journal_revoke"); |
| 90 | err = ext3_journal_revoke(handle, blocknr, bh); |
| 91 | if (err) |
Harvey Harrison | e05b6b5 | 2008-04-28 02:16:15 -0700 | [diff] [blame] | 92 | ext3_abort(inode->i_sb, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | "error %d when attempting revoke", err); |
| 94 | BUFFER_TRACE(bh, "exit"); |
| 95 | return err; |
| 96 | } |
| 97 | |
| 98 | /* |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 99 | * Work out how many blocks we need to proceed with the next chunk of a |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | * truncate transaction. |
| 101 | */ |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 102 | static unsigned long blocks_for_truncate(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | { |
| 104 | unsigned long needed; |
| 105 | |
| 106 | needed = inode->i_blocks >> (inode->i_sb->s_blocksize_bits - 9); |
| 107 | |
| 108 | /* Give ourselves just enough room to cope with inodes in which |
| 109 | * i_blocks is corrupt: we've seen disk corruptions in the past |
| 110 | * which resulted in random data in an inode which looked enough |
| 111 | * like a regular file for ext3 to try to delete it. Things |
| 112 | * will go a bit crazy if that happens, but at least we should |
| 113 | * try not to panic the whole kernel. */ |
| 114 | if (needed < 2) |
| 115 | needed = 2; |
| 116 | |
| 117 | /* But we need to bound the transaction so we don't overflow the |
| 118 | * journal. */ |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 119 | if (needed > EXT3_MAX_TRANS_DATA) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | needed = EXT3_MAX_TRANS_DATA; |
| 121 | |
Jan Kara | 1f54587 | 2005-06-23 22:01:04 -0700 | [diff] [blame] | 122 | return EXT3_DATA_TRANS_BLOCKS(inode->i_sb) + needed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 125 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | * Truncate transactions can be complex and absolutely huge. So we need to |
| 127 | * be able to restart the transaction at a conventient checkpoint to make |
| 128 | * sure we don't overflow the journal. |
| 129 | * |
| 130 | * start_transaction gets us a new handle for a truncate transaction, |
| 131 | * and extend_transaction tries to extend the existing one a bit. If |
| 132 | * extend fails, we need to propagate the failure up and restart the |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 133 | * transaction in the top-level truncate loop. --sct |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | */ |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 135 | static handle_t *start_transaction(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | { |
| 137 | handle_t *result; |
| 138 | |
| 139 | result = ext3_journal_start(inode, blocks_for_truncate(inode)); |
| 140 | if (!IS_ERR(result)) |
| 141 | return result; |
| 142 | |
| 143 | ext3_std_error(inode->i_sb, PTR_ERR(result)); |
| 144 | return result; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Try to extend this transaction for the purposes of truncation. |
| 149 | * |
| 150 | * Returns 0 if we managed to create more room. If we can't create more |
| 151 | * room, and the transaction must be restarted we return 1. |
| 152 | */ |
| 153 | static int try_to_extend_transaction(handle_t *handle, struct inode *inode) |
| 154 | { |
| 155 | if (handle->h_buffer_credits > EXT3_RESERVE_TRANS_BLOCKS) |
| 156 | return 0; |
| 157 | if (!ext3_journal_extend(handle, blocks_for_truncate(inode))) |
| 158 | return 0; |
| 159 | return 1; |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * Restart the transaction associated with *handle. This does a commit, |
| 164 | * so before we call here everything must be consistently dirtied against |
| 165 | * this transaction. |
| 166 | */ |
Jan Kara | 00171d3 | 2009-08-11 19:06:10 +0200 | [diff] [blame] | 167 | static int truncate_restart_transaction(handle_t *handle, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Jan Kara | 00171d3 | 2009-08-11 19:06:10 +0200 | [diff] [blame] | 169 | int ret; |
| 170 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | jbd_debug(2, "restarting handle %p\n", handle); |
Jan Kara | 00171d3 | 2009-08-11 19:06:10 +0200 | [diff] [blame] | 172 | /* |
| 173 | * Drop truncate_mutex to avoid deadlock with ext3_get_blocks_handle |
| 174 | * At this moment, get_block can be called only for blocks inside |
| 175 | * i_size since page cache has been already dropped and writes are |
| 176 | * blocked by i_mutex. So we can safely drop the truncate_mutex. |
| 177 | */ |
| 178 | mutex_unlock(&EXT3_I(inode)->truncate_mutex); |
| 179 | ret = ext3_journal_restart(handle, blocks_for_truncate(inode)); |
| 180 | mutex_lock(&EXT3_I(inode)->truncate_mutex); |
| 181 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
| 183 | |
| 184 | /* |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 185 | * Called at inode eviction from icache |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | */ |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 187 | void ext3_evict_inode (struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | { |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 189 | struct ext3_inode_info *ei = EXT3_I(inode); |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 190 | struct ext3_block_alloc_info *rsv; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | handle_t *handle; |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 192 | int want_delete = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 194 | trace_ext3_evict_inode(inode); |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 195 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 196 | dquot_initialize(inode); |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 197 | want_delete = 1; |
| 198 | } |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 199 | |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 200 | /* |
| 201 | * When journalling data dirty buffers are tracked only in the journal. |
| 202 | * So although mm thinks everything is clean and ready for reaping the |
| 203 | * inode might still have some pages to write in the running |
| 204 | * transaction or waiting to be checkpointed. Thus calling |
| 205 | * journal_invalidatepage() (via truncate_inode_pages()) to discard |
| 206 | * these buffers can cause data loss. Also even if we did not discard |
| 207 | * these buffers, we would have no way to find them after the inode |
| 208 | * is reaped and thus user could see stale data if he tries to read |
| 209 | * them before the transaction is checkpointed. So be careful and |
| 210 | * force everything to disk here... We use ei->i_datasync_tid to |
| 211 | * store the newest transaction containing inode's data. |
| 212 | * |
| 213 | * Note that directories do not have this problem because they don't |
| 214 | * use page cache. |
Dan Carpenter | bcdd0c1 | 2011-11-22 11:00:20 +0300 | [diff] [blame] | 215 | * |
| 216 | * The s_journal check handles the case when ext3_get_journal() fails |
| 217 | * and puts the journal inode. |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 218 | */ |
| 219 | if (inode->i_nlink && ext3_should_journal_data(inode) && |
Dan Carpenter | bcdd0c1 | 2011-11-22 11:00:20 +0300 | [diff] [blame] | 220 | EXT3_SB(inode->i_sb)->s_journal && |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 221 | (S_ISLNK(inode->i_mode) || S_ISREG(inode->i_mode))) { |
| 222 | tid_t commit_tid = atomic_read(&ei->i_datasync_tid); |
| 223 | journal_t *journal = EXT3_SB(inode->i_sb)->s_journal; |
| 224 | |
| 225 | log_start_commit(journal, commit_tid); |
| 226 | log_wait_commit(journal, commit_tid); |
| 227 | filemap_write_and_wait(&inode->i_data); |
| 228 | } |
Mark Fasheh | fef2665 | 2005-09-09 13:01:31 -0700 | [diff] [blame] | 229 | truncate_inode_pages(&inode->i_data, 0); |
| 230 | |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 231 | ext3_discard_reservation(inode); |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 232 | rsv = ei->i_block_alloc_info; |
| 233 | ei->i_block_alloc_info = NULL; |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 234 | if (unlikely(rsv)) |
| 235 | kfree(rsv); |
| 236 | |
| 237 | if (!want_delete) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | goto no_delete; |
| 239 | |
| 240 | handle = start_transaction(inode); |
| 241 | if (IS_ERR(handle)) { |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 242 | /* |
| 243 | * If we're going to skip the normal cleanup, we still need to |
| 244 | * make sure that the in-core orphan linked list is properly |
| 245 | * cleaned up. |
| 246 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | ext3_orphan_del(NULL, inode); |
| 248 | goto no_delete; |
| 249 | } |
| 250 | |
| 251 | if (IS_SYNC(inode)) |
| 252 | handle->h_sync = 1; |
| 253 | inode->i_size = 0; |
| 254 | if (inode->i_blocks) |
| 255 | ext3_truncate(inode); |
| 256 | /* |
Jan Kara | 40680f2f | 2011-05-24 22:24:47 +0200 | [diff] [blame] | 257 | * Kill off the orphan record created when the inode lost the last |
| 258 | * link. Note that ext3_orphan_del() has to be able to cope with the |
| 259 | * deletion of a non-existent orphan - ext3_truncate() could |
| 260 | * have removed the record. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | */ |
| 262 | ext3_orphan_del(handle, inode); |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 263 | ei->i_dtime = get_seconds(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 264 | |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 265 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | * One subtle ordering requirement: if anything has gone wrong |
| 267 | * (transaction abort, IO errors, whatever), then we can still |
| 268 | * do these next steps (the fs will already have been marked as |
| 269 | * having errors), but we can't free the inode if the mark_dirty |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 270 | * fails. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | */ |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 272 | if (ext3_mark_inode_dirty(handle, inode)) { |
| 273 | /* If that failed, just dquot_drop() and be done with that */ |
| 274 | dquot_drop(inode); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 275 | clear_inode(inode); |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 276 | } else { |
| 277 | ext3_xattr_delete_inode(handle, inode); |
| 278 | dquot_free_inode(inode); |
| 279 | dquot_drop(inode); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 280 | clear_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | ext3_free_inode(handle, inode); |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 282 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | ext3_journal_stop(handle); |
| 284 | return; |
| 285 | no_delete: |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 286 | clear_inode(inode); |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 287 | dquot_drop(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | typedef struct { |
| 291 | __le32 *p; |
| 292 | __le32 key; |
| 293 | struct buffer_head *bh; |
| 294 | } Indirect; |
| 295 | |
| 296 | static inline void add_chain(Indirect *p, struct buffer_head *bh, __le32 *v) |
| 297 | { |
| 298 | p->key = *(p->p = v); |
| 299 | p->bh = bh; |
| 300 | } |
| 301 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 302 | static int verify_chain(Indirect *from, Indirect *to) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | { |
| 304 | while (from <= to && from->key == *from->p) |
| 305 | from++; |
| 306 | return (from > to); |
| 307 | } |
| 308 | |
| 309 | /** |
| 310 | * ext3_block_to_path - parse the block number into array of offsets |
| 311 | * @inode: inode in question (we are only interested in its superblock) |
| 312 | * @i_block: block number to be parsed |
| 313 | * @offsets: array to store the offsets in |
| 314 | * @boundary: set this non-zero if the referred-to block is likely to be |
| 315 | * followed (on disk) by an indirect block. |
| 316 | * |
| 317 | * To store the locations of file's data ext3 uses a data structure common |
| 318 | * for UNIX filesystems - tree of pointers anchored in the inode, with |
| 319 | * data blocks at leaves and indirect blocks in intermediate nodes. |
| 320 | * This function translates the block number into path in that tree - |
| 321 | * return value is the path length and @offsets[n] is the offset of |
| 322 | * pointer to (n+1)th node in the nth one. If @block is out of range |
| 323 | * (negative or too large) warning is printed and zero returned. |
| 324 | * |
| 325 | * Note: function doesn't find node addresses, so no IO is needed. All |
| 326 | * we need to know is the capacity of indirect blocks (taken from the |
| 327 | * inode->i_sb). |
| 328 | */ |
| 329 | |
| 330 | /* |
| 331 | * Portability note: the last comparison (check that we fit into triple |
| 332 | * indirect block) is spelled differently, because otherwise on an |
| 333 | * architecture with 32-bit longs and 8Kb pages we might get into trouble |
| 334 | * if our filesystem had 8Kb blocks. We might use long long, but that would |
| 335 | * kill us on x86. Oh, well, at least the sign propagation does not matter - |
| 336 | * i_block would have to be negative in the very beginning, so we would not |
| 337 | * get there at all. |
| 338 | */ |
| 339 | |
| 340 | static int ext3_block_to_path(struct inode *inode, |
| 341 | long i_block, int offsets[4], int *boundary) |
| 342 | { |
| 343 | int ptrs = EXT3_ADDR_PER_BLOCK(inode->i_sb); |
| 344 | int ptrs_bits = EXT3_ADDR_PER_BLOCK_BITS(inode->i_sb); |
| 345 | const long direct_blocks = EXT3_NDIR_BLOCKS, |
| 346 | indirect_blocks = ptrs, |
| 347 | double_blocks = (1 << (ptrs_bits * 2)); |
| 348 | int n = 0; |
| 349 | int final = 0; |
| 350 | |
| 351 | if (i_block < 0) { |
| 352 | ext3_warning (inode->i_sb, "ext3_block_to_path", "block < 0"); |
| 353 | } else if (i_block < direct_blocks) { |
| 354 | offsets[n++] = i_block; |
| 355 | final = direct_blocks; |
| 356 | } else if ( (i_block -= direct_blocks) < indirect_blocks) { |
| 357 | offsets[n++] = EXT3_IND_BLOCK; |
| 358 | offsets[n++] = i_block; |
| 359 | final = ptrs; |
| 360 | } else if ((i_block -= indirect_blocks) < double_blocks) { |
| 361 | offsets[n++] = EXT3_DIND_BLOCK; |
| 362 | offsets[n++] = i_block >> ptrs_bits; |
| 363 | offsets[n++] = i_block & (ptrs - 1); |
| 364 | final = ptrs; |
| 365 | } else if (((i_block -= double_blocks) >> (ptrs_bits * 2)) < ptrs) { |
| 366 | offsets[n++] = EXT3_TIND_BLOCK; |
| 367 | offsets[n++] = i_block >> (ptrs_bits * 2); |
| 368 | offsets[n++] = (i_block >> ptrs_bits) & (ptrs - 1); |
| 369 | offsets[n++] = i_block & (ptrs - 1); |
| 370 | final = ptrs; |
| 371 | } else { |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 372 | ext3_warning(inode->i_sb, "ext3_block_to_path", "block > big"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | } |
| 374 | if (boundary) |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 375 | *boundary = final - 1 - (i_block & (ptrs - 1)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | return n; |
| 377 | } |
| 378 | |
| 379 | /** |
| 380 | * ext3_get_branch - read the chain of indirect blocks leading to data |
| 381 | * @inode: inode in question |
| 382 | * @depth: depth of the chain (1 - direct pointer, etc.) |
| 383 | * @offsets: offsets of pointers in inode/indirect blocks |
| 384 | * @chain: place to store the result |
| 385 | * @err: here we store the error value |
| 386 | * |
| 387 | * Function fills the array of triples <key, p, bh> and returns %NULL |
| 388 | * if everything went OK or the pointer to the last filled triple |
| 389 | * (incomplete one) otherwise. Upon the return chain[i].key contains |
| 390 | * the number of (i+1)-th block in the chain (as it is stored in memory, |
| 391 | * i.e. little-endian 32-bit), chain[i].p contains the address of that |
| 392 | * number (it points into struct inode for i==0 and into the bh->b_data |
| 393 | * for i>0) and chain[i].bh points to the buffer_head of i-th indirect |
| 394 | * block for i>0 and NULL for i==0. In other words, it holds the block |
| 395 | * numbers of the chain, addresses they were taken from (and where we can |
| 396 | * verify that chain did not change) and buffer_heads hosting these |
| 397 | * numbers. |
| 398 | * |
| 399 | * Function stops when it stumbles upon zero pointer (absent block) |
| 400 | * (pointer to last triple returned, *@err == 0) |
| 401 | * or when it gets an IO error reading an indirect block |
| 402 | * (ditto, *@err == -EIO) |
| 403 | * or when it notices that chain had been changed while it was reading |
| 404 | * (ditto, *@err == -EAGAIN) |
| 405 | * or when it reads all @depth-1 indirect blocks successfully and finds |
| 406 | * the whole chain, all way to the data (returns %NULL, *err == 0). |
| 407 | */ |
| 408 | static Indirect *ext3_get_branch(struct inode *inode, int depth, int *offsets, |
| 409 | Indirect chain[4], int *err) |
| 410 | { |
| 411 | struct super_block *sb = inode->i_sb; |
| 412 | Indirect *p = chain; |
| 413 | struct buffer_head *bh; |
| 414 | |
| 415 | *err = 0; |
| 416 | /* i_data is not going away, no lock needed */ |
| 417 | add_chain (chain, NULL, EXT3_I(inode)->i_data + *offsets); |
| 418 | if (!p->key) |
| 419 | goto no_block; |
| 420 | while (--depth) { |
| 421 | bh = sb_bread(sb, le32_to_cpu(p->key)); |
| 422 | if (!bh) |
| 423 | goto failure; |
| 424 | /* Reader: pointers */ |
| 425 | if (!verify_chain(chain, p)) |
| 426 | goto changed; |
| 427 | add_chain(++p, bh, (__le32*)bh->b_data + *++offsets); |
| 428 | /* Reader: end */ |
| 429 | if (!p->key) |
| 430 | goto no_block; |
| 431 | } |
| 432 | return NULL; |
| 433 | |
| 434 | changed: |
| 435 | brelse(bh); |
| 436 | *err = -EAGAIN; |
| 437 | goto no_block; |
| 438 | failure: |
| 439 | *err = -EIO; |
| 440 | no_block: |
| 441 | return p; |
| 442 | } |
| 443 | |
| 444 | /** |
| 445 | * ext3_find_near - find a place for allocation with sufficient locality |
| 446 | * @inode: owner |
| 447 | * @ind: descriptor of indirect block. |
| 448 | * |
Benoit Boissinot | 1cc8dcf | 2008-04-21 22:45:55 +0000 | [diff] [blame] | 449 | * This function returns the preferred place for block allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | * It is used when heuristic for sequential allocation fails. |
| 451 | * Rules are: |
| 452 | * + if there is a block to the left of our position - allocate near it. |
| 453 | * + if pointer will live in indirect block - allocate near that block. |
| 454 | * + if pointer will live in inode - allocate in the same |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 455 | * cylinder group. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | * |
| 457 | * In the latter case we colour the starting block by the callers PID to |
| 458 | * prevent it from clashing with concurrent allocations for a different inode |
| 459 | * in the same block group. The PID is used here so that functionally related |
| 460 | * files will be close-by on-disk. |
| 461 | * |
| 462 | * Caller must make sure that @ind is valid and will stay that way. |
| 463 | */ |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 464 | static ext3_fsblk_t ext3_find_near(struct inode *inode, Indirect *ind) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | { |
| 466 | struct ext3_inode_info *ei = EXT3_I(inode); |
| 467 | __le32 *start = ind->bh ? (__le32*) ind->bh->b_data : ei->i_data; |
| 468 | __le32 *p; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 469 | ext3_fsblk_t bg_start; |
| 470 | ext3_grpblk_t colour; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
| 472 | /* Try to find previous block */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 473 | for (p = ind->p - 1; p >= start; p--) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | if (*p) |
| 475 | return le32_to_cpu(*p); |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 476 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | |
| 478 | /* No such thing, so let's try location of indirect block */ |
| 479 | if (ind->bh) |
| 480 | return ind->bh->b_blocknr; |
| 481 | |
| 482 | /* |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 483 | * It is going to be referred to from the inode itself? OK, just put it |
| 484 | * into the same cylinder group then. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | */ |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 486 | bg_start = ext3_group_first_block_no(inode->i_sb, ei->i_block_group); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | colour = (current->pid % 16) * |
| 488 | (EXT3_BLOCKS_PER_GROUP(inode->i_sb) / 16); |
| 489 | return bg_start + colour; |
| 490 | } |
| 491 | |
| 492 | /** |
Benoit Boissinot | 1cc8dcf | 2008-04-21 22:45:55 +0000 | [diff] [blame] | 493 | * ext3_find_goal - find a preferred place for allocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | * @inode: owner |
| 495 | * @block: block we want |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | * @partial: pointer to the last triple within a chain |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | * |
Benoit Boissinot | 1cc8dcf | 2008-04-21 22:45:55 +0000 | [diff] [blame] | 498 | * Normally this function find the preferred place for block allocation, |
Akinobu Mita | fb01bfd | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 499 | * returns it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | */ |
| 501 | |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 502 | static ext3_fsblk_t ext3_find_goal(struct inode *inode, long block, |
Akinobu Mita | fb01bfd | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 503 | Indirect *partial) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | { |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 505 | struct ext3_block_alloc_info *block_i; |
| 506 | |
| 507 | block_i = EXT3_I(inode)->i_block_alloc_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | |
| 509 | /* |
| 510 | * try the heuristic for sequential allocation, |
| 511 | * failing that at least try to get decent locality. |
| 512 | */ |
| 513 | if (block_i && (block == block_i->last_alloc_logical_block + 1) |
| 514 | && (block_i->last_alloc_physical_block != 0)) { |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 515 | return block_i->last_alloc_physical_block + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | } |
| 517 | |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 518 | return ext3_find_near(inode, partial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | } |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 520 | |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 521 | /** |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 522 | * ext3_blks_to_allocate - Look up the block map and count the number |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 523 | * of direct blocks need to be allocated for the given branch. |
| 524 | * |
Dave Kleikamp | e9ad562 | 2006-09-27 01:49:35 -0700 | [diff] [blame] | 525 | * @branch: chain of indirect blocks |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 526 | * @k: number of blocks need for indirect blocks |
| 527 | * @blks: number of data blocks to be mapped. |
| 528 | * @blocks_to_boundary: the offset in the indirect block |
| 529 | * |
| 530 | * return the total number of blocks to be allocate, including the |
| 531 | * direct and indirect blocks. |
| 532 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 533 | static int ext3_blks_to_allocate(Indirect *branch, int k, unsigned long blks, |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 534 | int blocks_to_boundary) |
| 535 | { |
| 536 | unsigned long count = 0; |
| 537 | |
| 538 | /* |
| 539 | * Simple case, [t,d]Indirect block(s) has not allocated yet |
| 540 | * then it's clear blocks on that path have not allocated |
| 541 | */ |
| 542 | if (k > 0) { |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 543 | /* right now we don't handle cross boundary allocation */ |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 544 | if (blks < blocks_to_boundary + 1) |
| 545 | count += blks; |
| 546 | else |
| 547 | count += blocks_to_boundary + 1; |
| 548 | return count; |
| 549 | } |
| 550 | |
| 551 | count++; |
| 552 | while (count < blks && count <= blocks_to_boundary && |
| 553 | le32_to_cpu(*(branch[0].p + count)) == 0) { |
| 554 | count++; |
| 555 | } |
| 556 | return count; |
| 557 | } |
| 558 | |
| 559 | /** |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 560 | * ext3_alloc_blocks - multiple allocate blocks needed for a branch |
| 561 | * @handle: handle for this transaction |
| 562 | * @inode: owner |
| 563 | * @goal: preferred place for allocation |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 564 | * @indirect_blks: the number of blocks need to allocate for indirect |
| 565 | * blocks |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 566 | * @blks: number of blocks need to allocated for direct blocks |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 567 | * @new_blocks: on return it will store the new block numbers for |
| 568 | * the indirect blocks(if needed) and the first direct block, |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 569 | * @err: here we store the error value |
| 570 | * |
| 571 | * return the number of direct blocks allocated |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 572 | */ |
| 573 | static int ext3_alloc_blocks(handle_t *handle, struct inode *inode, |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 574 | ext3_fsblk_t goal, int indirect_blks, int blks, |
| 575 | ext3_fsblk_t new_blocks[4], int *err) |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 576 | { |
| 577 | int target, i; |
| 578 | unsigned long count = 0; |
| 579 | int index = 0; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 580 | ext3_fsblk_t current_block = 0; |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 581 | int ret = 0; |
| 582 | |
| 583 | /* |
| 584 | * Here we try to allocate the requested multiple blocks at once, |
| 585 | * on a best-effort basis. |
| 586 | * To build a branch, we should allocate blocks for |
| 587 | * the indirect blocks(if not allocated yet), and at least |
| 588 | * the first direct block of this branch. That's the |
| 589 | * minimum number of blocks need to allocate(required) |
| 590 | */ |
| 591 | target = blks + indirect_blks; |
| 592 | |
| 593 | while (1) { |
| 594 | count = target; |
| 595 | /* allocating blocks for indirect blocks and direct blocks */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 596 | current_block = ext3_new_blocks(handle,inode,goal,&count,err); |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 597 | if (*err) |
| 598 | goto failed_out; |
| 599 | |
| 600 | target -= count; |
| 601 | /* allocate blocks for indirect blocks */ |
| 602 | while (index < indirect_blks && count) { |
| 603 | new_blocks[index++] = current_block++; |
| 604 | count--; |
| 605 | } |
| 606 | |
| 607 | if (count > 0) |
| 608 | break; |
| 609 | } |
| 610 | |
| 611 | /* save the new block number for the first direct block */ |
| 612 | new_blocks[index] = current_block; |
| 613 | |
| 614 | /* total number of blocks allocated for direct blocks */ |
| 615 | ret = count; |
| 616 | *err = 0; |
| 617 | return ret; |
| 618 | failed_out: |
| 619 | for (i = 0; i <index; i++) |
| 620 | ext3_free_blocks(handle, inode, new_blocks[i], 1); |
| 621 | return ret; |
| 622 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | |
| 624 | /** |
| 625 | * ext3_alloc_branch - allocate and set up a chain of blocks. |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 626 | * @handle: handle for this transaction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | * @inode: owner |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 628 | * @indirect_blks: number of allocated indirect blocks |
| 629 | * @blks: number of allocated direct blocks |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 630 | * @goal: preferred place for allocation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | * @offsets: offsets (in the blocks) to store the pointers to next. |
| 632 | * @branch: place to store the chain in. |
| 633 | * |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 634 | * This function allocates blocks, zeroes out all but the last one, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | * links them into chain and (if we are synchronous) writes them to disk. |
| 636 | * In other words, it prepares a branch that can be spliced onto the |
| 637 | * inode. It stores the information about that chain in the branch[], in |
| 638 | * the same format as ext3_get_branch() would do. We are calling it after |
| 639 | * we had read the existing part of chain and partial points to the last |
| 640 | * triple of that (one with zero ->key). Upon the exit we have the same |
Glauber de Oliveira Costa | 5b11687 | 2005-10-30 15:02:48 -0800 | [diff] [blame] | 641 | * picture as after the successful ext3_get_block(), except that in one |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | * place chain is disconnected - *branch->p is still zero (we did not |
| 643 | * set the last link), but branch->key contains the number that should |
| 644 | * be placed into *branch->p to fill that gap. |
| 645 | * |
| 646 | * If allocation fails we free all blocks we've allocated (and forget |
| 647 | * their buffer_heads) and return the error value the from failed |
| 648 | * ext3_alloc_block() (normally -ENOSPC). Otherwise we set the chain |
| 649 | * as described above and return 0. |
| 650 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | static int ext3_alloc_branch(handle_t *handle, struct inode *inode, |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 652 | int indirect_blks, int *blks, ext3_fsblk_t goal, |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 653 | int *offsets, Indirect *branch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | { |
| 655 | int blocksize = inode->i_sb->s_blocksize; |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 656 | int i, n = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | int err = 0; |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 658 | struct buffer_head *bh; |
| 659 | int num; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 660 | ext3_fsblk_t new_blocks[4]; |
| 661 | ext3_fsblk_t current_block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 663 | num = ext3_alloc_blocks(handle, inode, goal, indirect_blks, |
| 664 | *blks, new_blocks, &err); |
| 665 | if (err) |
| 666 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 668 | branch[0].key = cpu_to_le32(new_blocks[0]); |
| 669 | /* |
| 670 | * metadata blocks and data blocks are allocated. |
| 671 | */ |
| 672 | for (n = 1; n <= indirect_blks; n++) { |
| 673 | /* |
| 674 | * Get buffer_head for parent block, zero it out |
| 675 | * and set the pointer to new one, then send |
| 676 | * parent to disk. |
| 677 | */ |
| 678 | bh = sb_getblk(inode->i_sb, new_blocks[n-1]); |
| 679 | branch[n].bh = bh; |
| 680 | lock_buffer(bh); |
| 681 | BUFFER_TRACE(bh, "call get_create_access"); |
| 682 | err = ext3_journal_get_create_access(handle, bh); |
| 683 | if (err) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | unlock_buffer(bh); |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 685 | brelse(bh); |
| 686 | goto failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 689 | memset(bh->b_data, 0, blocksize); |
| 690 | branch[n].p = (__le32 *) bh->b_data + offsets[n]; |
| 691 | branch[n].key = cpu_to_le32(new_blocks[n]); |
| 692 | *branch[n].p = branch[n].key; |
| 693 | if ( n == indirect_blks) { |
| 694 | current_block = new_blocks[n]; |
| 695 | /* |
| 696 | * End of chain, update the last new metablock of |
| 697 | * the chain to point to the new allocated |
| 698 | * data blocks numbers |
| 699 | */ |
| 700 | for (i=1; i < num; i++) |
| 701 | *(branch[n].p + i) = cpu_to_le32(++current_block); |
| 702 | } |
| 703 | BUFFER_TRACE(bh, "marking uptodate"); |
| 704 | set_buffer_uptodate(bh); |
| 705 | unlock_buffer(bh); |
| 706 | |
| 707 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); |
| 708 | err = ext3_journal_dirty_metadata(handle, bh); |
| 709 | if (err) |
| 710 | goto failed; |
| 711 | } |
| 712 | *blks = num; |
| 713 | return err; |
| 714 | failed: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | /* Allocation failed, free what we already allocated */ |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 716 | for (i = 1; i <= n ; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | BUFFER_TRACE(branch[i].bh, "call journal_forget"); |
| 718 | ext3_journal_forget(handle, branch[i].bh); |
| 719 | } |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 720 | for (i = 0; i <indirect_blks; i++) |
| 721 | ext3_free_blocks(handle, inode, new_blocks[i], 1); |
| 722 | |
| 723 | ext3_free_blocks(handle, inode, new_blocks[i], num); |
| 724 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | return err; |
| 726 | } |
| 727 | |
| 728 | /** |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 729 | * ext3_splice_branch - splice the allocated branch onto inode. |
Namhyung Kim | a4c18ad | 2010-10-19 00:34:35 +0900 | [diff] [blame] | 730 | * @handle: handle for this transaction |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 731 | * @inode: owner |
| 732 | * @block: (logical) number of block we are adding |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 733 | * @where: location of missing link |
| 734 | * @num: number of indirect blocks we are adding |
| 735 | * @blks: number of direct blocks we are adding |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | * |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 737 | * This function fills the missing link and does all housekeeping needed in |
| 738 | * inode (->i_blocks, etc.). In case of success we end up with the full |
| 739 | * chain to new block and return 0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 741 | static int ext3_splice_branch(handle_t *handle, struct inode *inode, |
| 742 | long block, Indirect *where, int num, int blks) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | { |
| 744 | int i; |
| 745 | int err = 0; |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 746 | struct ext3_block_alloc_info *block_i; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 747 | ext3_fsblk_t current_block; |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 748 | struct ext3_inode_info *ei = EXT3_I(inode); |
Kazuya Mio | ac1334b | 2012-02-08 16:34:29 +0900 | [diff] [blame] | 749 | struct timespec now; |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 750 | |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 751 | block_i = ei->i_block_alloc_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | /* |
| 753 | * If we're splicing into a [td]indirect block (as opposed to the |
| 754 | * inode) then we need to get write access to the [td]indirect block |
| 755 | * before the splice. |
| 756 | */ |
| 757 | if (where->bh) { |
| 758 | BUFFER_TRACE(where->bh, "get_write_access"); |
| 759 | err = ext3_journal_get_write_access(handle, where->bh); |
| 760 | if (err) |
| 761 | goto err_out; |
| 762 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | /* That's it */ |
| 764 | |
| 765 | *where->p = where->key; |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 766 | |
| 767 | /* |
| 768 | * Update the host buffer_head or inode to point to more just allocated |
| 769 | * direct blocks blocks |
| 770 | */ |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 771 | if (num == 0 && blks > 1) { |
Mingming Cao | 5dea517 | 2006-05-03 19:55:12 -0700 | [diff] [blame] | 772 | current_block = le32_to_cpu(where->key) + 1; |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 773 | for (i = 1; i < blks; i++) |
| 774 | *(where->p + i ) = cpu_to_le32(current_block++); |
| 775 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | |
| 777 | /* |
| 778 | * update the most recently allocated logical & physical block |
| 779 | * in i_block_alloc_info, to assist find the proper goal block for next |
| 780 | * allocation |
| 781 | */ |
| 782 | if (block_i) { |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 783 | block_i->last_alloc_logical_block = block + blks - 1; |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 784 | block_i->last_alloc_physical_block = |
Mingming Cao | 5dea517 | 2006-05-03 19:55:12 -0700 | [diff] [blame] | 785 | le32_to_cpu(where[num].key) + blks - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | } |
| 787 | |
| 788 | /* We are done with atomic stuff, now do the rest of housekeeping */ |
Kazuya Mio | ac1334b | 2012-02-08 16:34:29 +0900 | [diff] [blame] | 789 | now = CURRENT_TIME_SEC; |
| 790 | if (!timespec_equal(&inode->i_ctime, &now) || !where->bh) { |
| 791 | inode->i_ctime = now; |
| 792 | ext3_mark_inode_dirty(handle, inode); |
| 793 | } |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 794 | /* ext3_mark_inode_dirty already updated i_sync_tid */ |
| 795 | atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | |
| 797 | /* had we spliced it onto indirect block? */ |
| 798 | if (where->bh) { |
| 799 | /* |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 800 | * If we spliced it onto an indirect block, we haven't |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | * altered the inode. Note however that if it is being spliced |
| 802 | * onto an indirect block at the very end of the file (the |
| 803 | * file is growing) then we *will* alter the inode to reflect |
| 804 | * the new i_size. But that is not done here - it is done in |
| 805 | * generic_commit_write->__mark_inode_dirty->ext3_dirty_inode. |
| 806 | */ |
| 807 | jbd_debug(5, "splicing indirect only\n"); |
| 808 | BUFFER_TRACE(where->bh, "call ext3_journal_dirty_metadata"); |
| 809 | err = ext3_journal_dirty_metadata(handle, where->bh); |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 810 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 811 | goto err_out; |
| 812 | } else { |
| 813 | /* |
| 814 | * OK, we spliced it into the inode itself on a direct block. |
| 815 | * Inode was dirtied above. |
| 816 | */ |
| 817 | jbd_debug(5, "splicing direct\n"); |
| 818 | } |
| 819 | return err; |
| 820 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | err_out: |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 822 | for (i = 1; i <= num; i++) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | BUFFER_TRACE(where[i].bh, "call journal_forget"); |
| 824 | ext3_journal_forget(handle, where[i].bh); |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 825 | ext3_free_blocks(handle,inode,le32_to_cpu(where[i-1].key),1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 826 | } |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 827 | ext3_free_blocks(handle, inode, le32_to_cpu(where[num].key), blks); |
| 828 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | return err; |
| 830 | } |
| 831 | |
| 832 | /* |
| 833 | * Allocation strategy is simple: if we have to allocate something, we will |
| 834 | * have to go the whole way to leaf. So let's do it before attaching anything |
| 835 | * to tree, set linkage between the newborn blocks, write them if sync is |
| 836 | * required, recheck the path, free and repeat if check fails, otherwise |
| 837 | * set the last missing link (that will protect us from any truncate-generated |
| 838 | * removals - all blocks on the path are immune now) and possibly force the |
| 839 | * write on the parent block. |
| 840 | * That has a nice additional property: no special recovery from the failed |
| 841 | * allocations is needed - we simply release blocks and do not touch anything |
| 842 | * reachable from inode. |
| 843 | * |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 844 | * `handle' can be NULL if create == 0. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | * |
| 846 | * The BKL may not be held on entry here. Be sure to take it early. |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 847 | * return > 0, # of blocks mapped or allocated. |
| 848 | * return = 0, if plain lookup failed. |
| 849 | * return < 0, error case. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 851 | int ext3_get_blocks_handle(handle_t *handle, struct inode *inode, |
| 852 | sector_t iblock, unsigned long maxblocks, |
| 853 | struct buffer_head *bh_result, |
Jan Kara | 43237b5 | 2009-05-20 18:41:58 +0200 | [diff] [blame] | 854 | int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 855 | { |
| 856 | int err = -EIO; |
| 857 | int offsets[4]; |
| 858 | Indirect chain[4]; |
| 859 | Indirect *partial; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 860 | ext3_fsblk_t goal; |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 861 | int indirect_blks; |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 862 | int blocks_to_boundary = 0; |
| 863 | int depth; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 864 | struct ext3_inode_info *ei = EXT3_I(inode); |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 865 | int count = 0; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 866 | ext3_fsblk_t first_block = 0; |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 867 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 869 | trace_ext3_get_blocks_enter(inode, iblock, maxblocks, create); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | J_ASSERT(handle != NULL || create == 0); |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 871 | depth = ext3_block_to_path(inode,iblock,offsets,&blocks_to_boundary); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
| 873 | if (depth == 0) |
| 874 | goto out; |
| 875 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | partial = ext3_get_branch(inode, depth, offsets, chain, &err); |
| 877 | |
| 878 | /* Simplest case - block found, no allocation needed */ |
| 879 | if (!partial) { |
Mingming Cao | 5dea517 | 2006-05-03 19:55:12 -0700 | [diff] [blame] | 880 | first_block = le32_to_cpu(chain[depth - 1].key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 881 | clear_buffer_new(bh_result); |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 882 | count++; |
| 883 | /*map more blocks*/ |
| 884 | while (count < maxblocks && count <= blocks_to_boundary) { |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 885 | ext3_fsblk_t blk; |
Mingming Cao | 5dea517 | 2006-05-03 19:55:12 -0700 | [diff] [blame] | 886 | |
Jan Kara | e8ef7aa | 2009-06-17 16:26:23 -0700 | [diff] [blame] | 887 | if (!verify_chain(chain, chain + depth - 1)) { |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 888 | /* |
| 889 | * Indirect block might be removed by |
| 890 | * truncate while we were reading it. |
| 891 | * Handling of that case: forget what we've |
| 892 | * got now. Flag the err as EAGAIN, so it |
| 893 | * will reread. |
| 894 | */ |
| 895 | err = -EAGAIN; |
| 896 | count = 0; |
| 897 | break; |
| 898 | } |
Mingming Cao | 5dea517 | 2006-05-03 19:55:12 -0700 | [diff] [blame] | 899 | blk = le32_to_cpu(*(chain[depth-1].p + count)); |
| 900 | |
| 901 | if (blk == first_block + count) |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 902 | count++; |
| 903 | else |
| 904 | break; |
| 905 | } |
| 906 | if (err != -EAGAIN) |
| 907 | goto got_it; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | } |
| 909 | |
| 910 | /* Next simple case - plain lookup or failed read of indirect block */ |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 911 | if (!create || err == -EIO) |
| 912 | goto cleanup; |
| 913 | |
Jan Kara | 40680f2f | 2011-05-24 22:24:47 +0200 | [diff] [blame] | 914 | /* |
| 915 | * Block out ext3_truncate while we alter the tree |
| 916 | */ |
Arjan van de Ven | 9746151 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 917 | mutex_lock(&ei->truncate_mutex); |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 918 | |
| 919 | /* |
| 920 | * If the indirect block is missing while we are reading |
| 921 | * the chain(ext3_get_branch() returns -EAGAIN err), or |
| 922 | * if the chain has been changed after we grab the semaphore, |
| 923 | * (either because another process truncated this branch, or |
| 924 | * another get_block allocated this branch) re-grab the chain to see if |
| 925 | * the request block has been allocated or not. |
| 926 | * |
| 927 | * Since we already block the truncate/other get_block |
| 928 | * at this point, we will have the current copy of the chain when we |
| 929 | * splice the branch into the tree. |
| 930 | */ |
| 931 | if (err == -EAGAIN || !verify_chain(chain, partial)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | while (partial > chain) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | brelse(partial->bh); |
| 934 | partial--; |
| 935 | } |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 936 | partial = ext3_get_branch(inode, depth, offsets, chain, &err); |
| 937 | if (!partial) { |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 938 | count++; |
Arjan van de Ven | 9746151 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 939 | mutex_unlock(&ei->truncate_mutex); |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 940 | if (err) |
| 941 | goto cleanup; |
| 942 | clear_buffer_new(bh_result); |
| 943 | goto got_it; |
| 944 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | } |
| 946 | |
| 947 | /* |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 948 | * Okay, we need to do block allocation. Lazily initialize the block |
| 949 | * allocation info here if necessary |
| 950 | */ |
| 951 | if (S_ISREG(inode->i_mode) && (!ei->i_block_alloc_info)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | ext3_init_block_alloc_info(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | |
Akinobu Mita | fb01bfd | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 954 | goal = ext3_find_goal(inode, iblock, partial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 956 | /* the number of blocks need to allocate for [d,t]indirect blocks */ |
| 957 | indirect_blks = (chain + depth) - partial - 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 958 | |
| 959 | /* |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 960 | * Next look up the indirect map to count the totoal number of |
| 961 | * direct blocks to allocate for this branch. |
| 962 | */ |
| 963 | count = ext3_blks_to_allocate(partial, indirect_blks, |
| 964 | maxblocks, blocks_to_boundary); |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 965 | err = ext3_alloc_branch(handle, inode, indirect_blks, &count, goal, |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 966 | offsets + (partial - chain), partial); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 968 | /* |
| 969 | * The ext3_splice_branch call will free and forget any buffers |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 970 | * on the new chain if there is a failure, but that risks using |
| 971 | * up transaction credits, especially for bitmaps where the |
| 972 | * credits cannot be returned. Can we handle this somehow? We |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 973 | * may need to return -EAGAIN upwards in the worst case. --sct |
| 974 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | if (!err) |
Mingming Cao | b47b247 | 2006-03-26 01:37:56 -0800 | [diff] [blame] | 976 | err = ext3_splice_branch(handle, inode, iblock, |
| 977 | partial, indirect_blks, count); |
Arjan van de Ven | 9746151 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 978 | mutex_unlock(&ei->truncate_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | if (err) |
| 980 | goto cleanup; |
| 981 | |
| 982 | set_buffer_new(bh_result); |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 983 | got_it: |
| 984 | map_bh(bh_result, inode->i_sb, le32_to_cpu(chain[depth-1].key)); |
Suparna Bhattacharya | 20acaa1 | 2006-09-16 12:15:58 -0700 | [diff] [blame] | 985 | if (count > blocks_to_boundary) |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 986 | set_buffer_boundary(bh_result); |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 987 | err = count; |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 988 | /* Clean up and exit */ |
| 989 | partial = chain + depth - 1; /* the whole chain */ |
| 990 | cleanup: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 991 | while (partial > chain) { |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 992 | BUFFER_TRACE(partial->bh, "call brelse"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | brelse(partial->bh); |
| 994 | partial--; |
| 995 | } |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 996 | BUFFER_TRACE(bh_result, "returned"); |
| 997 | out: |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 998 | trace_ext3_get_blocks_exit(inode, iblock, |
| 999 | depth ? le32_to_cpu(chain[depth-1].key) : 0, |
| 1000 | count, err); |
Mingming Cao | fe55c45 | 2005-05-01 08:59:20 -0700 | [diff] [blame] | 1001 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | } |
| 1003 | |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1004 | /* Maximum number of blocks we map for direct IO at once. */ |
| 1005 | #define DIO_MAX_BLOCKS 4096 |
| 1006 | /* |
| 1007 | * Number of credits we need for writing DIO_MAX_BLOCKS: |
| 1008 | * We need sb + group descriptor + bitmap + inode -> 4 |
| 1009 | * For B blocks with A block pointers per block we need: |
| 1010 | * 1 (triple ind.) + (B/A/A + 2) (doubly ind.) + (B/A + 2) (indirect). |
| 1011 | * If we plug in 4096 for B and 256 for A (for 1KB block size), we get 25. |
| 1012 | */ |
| 1013 | #define DIO_CREDITS 25 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1014 | |
Badari Pulavarty | f91a2ad | 2006-03-26 01:38:04 -0800 | [diff] [blame] | 1015 | static int ext3_get_block(struct inode *inode, sector_t iblock, |
| 1016 | struct buffer_head *bh_result, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | { |
Dmitriy Monakhov | 3e4fdaf | 2007-02-10 01:46:35 -0800 | [diff] [blame] | 1018 | handle_t *handle = ext3_journal_current_handle(); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1019 | int ret = 0, started = 0; |
Badari Pulavarty | 1d8fa7a | 2006-03-26 01:38:02 -0800 | [diff] [blame] | 1020 | unsigned max_blocks = bh_result->b_size >> inode->i_blkbits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1022 | if (create && !handle) { /* Direct IO write... */ |
| 1023 | if (max_blocks > DIO_MAX_BLOCKS) |
| 1024 | max_blocks = DIO_MAX_BLOCKS; |
| 1025 | handle = ext3_journal_start(inode, DIO_CREDITS + |
Dmitry Monakhov | c459001 | 2009-12-09 03:05:30 +0300 | [diff] [blame] | 1026 | EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb)); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1027 | if (IS_ERR(handle)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | ret = PTR_ERR(handle); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1029 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | } |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1031 | started = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1032 | } |
| 1033 | |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1034 | ret = ext3_get_blocks_handle(handle, inode, iblock, |
Jan Kara | 43237b5 | 2009-05-20 18:41:58 +0200 | [diff] [blame] | 1035 | max_blocks, bh_result, create); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1036 | if (ret > 0) { |
| 1037 | bh_result->b_size = (ret << inode->i_blkbits); |
| 1038 | ret = 0; |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 1039 | } |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1040 | if (started) |
| 1041 | ext3_journal_stop(handle); |
| 1042 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | return ret; |
| 1044 | } |
| 1045 | |
Josef Bacik | 68c9d70 | 2008-10-03 17:32:43 -0400 | [diff] [blame] | 1046 | int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 1047 | u64 start, u64 len) |
| 1048 | { |
| 1049 | return generic_block_fiemap(inode, fieinfo, start, len, |
| 1050 | ext3_get_block); |
| 1051 | } |
| 1052 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | /* |
| 1054 | * `handle' can be NULL if create is zero |
| 1055 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1056 | struct buffer_head *ext3_getblk(handle_t *handle, struct inode *inode, |
| 1057 | long block, int create, int *errp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1058 | { |
| 1059 | struct buffer_head dummy; |
| 1060 | int fatal = 0, err; |
| 1061 | |
| 1062 | J_ASSERT(handle != NULL || create == 0); |
| 1063 | |
| 1064 | dummy.b_state = 0; |
| 1065 | dummy.b_blocknr = -1000; |
| 1066 | buffer_trace_init(&dummy.b_history); |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 1067 | err = ext3_get_blocks_handle(handle, inode, block, 1, |
Jan Kara | 43237b5 | 2009-05-20 18:41:58 +0200 | [diff] [blame] | 1068 | &dummy, create); |
Badari Pulavarty | 3665d0e | 2006-09-08 09:48:21 -0700 | [diff] [blame] | 1069 | /* |
| 1070 | * ext3_get_blocks_handle() returns number of blocks |
| 1071 | * mapped. 0 in case of a HOLE. |
| 1072 | */ |
| 1073 | if (err > 0) { |
Julia Lawall | 4789775 | 2012-11-03 21:30:21 +0100 | [diff] [blame] | 1074 | WARN_ON(err > 1); |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 1075 | err = 0; |
Mingming Cao | 89747d3 | 2006-03-26 01:37:55 -0800 | [diff] [blame] | 1076 | } |
| 1077 | *errp = err; |
| 1078 | if (!err && buffer_mapped(&dummy)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1079 | struct buffer_head *bh; |
| 1080 | bh = sb_getblk(inode->i_sb, dummy.b_blocknr); |
Glauber de Oliveira Costa | 2973dfd | 2005-10-30 15:03:05 -0800 | [diff] [blame] | 1081 | if (!bh) { |
| 1082 | *errp = -EIO; |
| 1083 | goto err; |
| 1084 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | if (buffer_new(&dummy)) { |
| 1086 | J_ASSERT(create != 0); |
Stephen Hemminger | c80544d | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 1087 | J_ASSERT(handle != NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1089 | /* |
| 1090 | * Now that we do not always journal data, we should |
| 1091 | * keep in mind whether this should always journal the |
| 1092 | * new buffer as metadata. For now, regular file |
| 1093 | * writes use ext3_get_block instead, so it's not a |
| 1094 | * problem. |
| 1095 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | lock_buffer(bh); |
| 1097 | BUFFER_TRACE(bh, "call get_create_access"); |
| 1098 | fatal = ext3_journal_get_create_access(handle, bh); |
| 1099 | if (!fatal && !buffer_uptodate(bh)) { |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1100 | memset(bh->b_data,0,inode->i_sb->s_blocksize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1101 | set_buffer_uptodate(bh); |
| 1102 | } |
| 1103 | unlock_buffer(bh); |
| 1104 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); |
| 1105 | err = ext3_journal_dirty_metadata(handle, bh); |
| 1106 | if (!fatal) |
| 1107 | fatal = err; |
| 1108 | } else { |
| 1109 | BUFFER_TRACE(bh, "not a new buffer"); |
| 1110 | } |
| 1111 | if (fatal) { |
| 1112 | *errp = fatal; |
| 1113 | brelse(bh); |
| 1114 | bh = NULL; |
| 1115 | } |
| 1116 | return bh; |
| 1117 | } |
Glauber de Oliveira Costa | 2973dfd | 2005-10-30 15:03:05 -0800 | [diff] [blame] | 1118 | err: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1119 | return NULL; |
| 1120 | } |
| 1121 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1122 | struct buffer_head *ext3_bread(handle_t *handle, struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1123 | int block, int create, int *err) |
| 1124 | { |
| 1125 | struct buffer_head * bh; |
| 1126 | |
| 1127 | bh = ext3_getblk(handle, inode, block, create, err); |
| 1128 | if (!bh) |
| 1129 | return bh; |
Zheng Liu | d03e129 | 2011-12-05 15:55:11 +0800 | [diff] [blame] | 1130 | if (bh_uptodate_or_lock(bh)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | return bh; |
Zheng Liu | d03e129 | 2011-12-05 15:55:11 +0800 | [diff] [blame] | 1132 | get_bh(bh); |
| 1133 | bh->b_end_io = end_buffer_read_sync; |
| 1134 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | wait_on_buffer(bh); |
| 1136 | if (buffer_uptodate(bh)) |
| 1137 | return bh; |
| 1138 | put_bh(bh); |
| 1139 | *err = -EIO; |
| 1140 | return NULL; |
| 1141 | } |
| 1142 | |
| 1143 | static int walk_page_buffers( handle_t *handle, |
| 1144 | struct buffer_head *head, |
| 1145 | unsigned from, |
| 1146 | unsigned to, |
| 1147 | int *partial, |
| 1148 | int (*fn)( handle_t *handle, |
| 1149 | struct buffer_head *bh)) |
| 1150 | { |
| 1151 | struct buffer_head *bh; |
| 1152 | unsigned block_start, block_end; |
| 1153 | unsigned blocksize = head->b_size; |
| 1154 | int err, ret = 0; |
| 1155 | struct buffer_head *next; |
| 1156 | |
| 1157 | for ( bh = head, block_start = 0; |
| 1158 | ret == 0 && (bh != head || !block_start); |
Dave Kleikamp | e9ad562 | 2006-09-27 01:49:35 -0700 | [diff] [blame] | 1159 | block_start = block_end, bh = next) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | { |
| 1161 | next = bh->b_this_page; |
| 1162 | block_end = block_start + blocksize; |
| 1163 | if (block_end <= from || block_start >= to) { |
| 1164 | if (partial && !buffer_uptodate(bh)) |
| 1165 | *partial = 1; |
| 1166 | continue; |
| 1167 | } |
| 1168 | err = (*fn)(handle, bh); |
| 1169 | if (!ret) |
| 1170 | ret = err; |
| 1171 | } |
| 1172 | return ret; |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * To preserve ordering, it is essential that the hole instantiation and |
| 1177 | * the data write be encapsulated in a single transaction. We cannot |
| 1178 | * close off a transaction and start a new one between the ext3_get_block() |
| 1179 | * and the commit_write(). So doing the journal_start at the start of |
| 1180 | * prepare_write() is the right place. |
| 1181 | * |
| 1182 | * Also, this function can nest inside ext3_writepage() -> |
| 1183 | * block_write_full_page(). In that case, we *know* that ext3_writepage() |
| 1184 | * has generated enough buffer credits to do the whole page. So we won't |
| 1185 | * block on the journal in that case, which is good, because the caller may |
| 1186 | * be PF_MEMALLOC. |
| 1187 | * |
| 1188 | * By accident, ext3 can be reentered when a transaction is open via |
| 1189 | * quota file writes. If we were to commit the transaction while thus |
| 1190 | * reentered, there can be a deadlock - we would be holding a quota |
| 1191 | * lock, and the commit would never complete if another thread had a |
| 1192 | * transaction open and was blocking on the quota lock - a ranking |
| 1193 | * violation. |
| 1194 | * |
| 1195 | * So what we do is to rely on the fact that journal_stop/journal_start |
| 1196 | * will _not_ run commit under these circumstances because handle->h_ref |
| 1197 | * is elevated. We'll still have enough credits for the tiny quotafile |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1198 | * write. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1199 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1200 | static int do_journal_get_write_access(handle_t *handle, |
| 1201 | struct buffer_head *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1202 | { |
Jan Kara | 5f11e6a | 2010-08-05 12:38:26 +0200 | [diff] [blame] | 1203 | int dirty = buffer_dirty(bh); |
| 1204 | int ret; |
| 1205 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1206 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
| 1207 | return 0; |
Jan Kara | 5f11e6a | 2010-08-05 12:38:26 +0200 | [diff] [blame] | 1208 | /* |
| 1209 | * __block_prepare_write() could have dirtied some buffers. Clean |
| 1210 | * the dirty bit as jbd2_journal_get_write_access() could complain |
| 1211 | * otherwise about fs integrity issues. Setting of the dirty bit |
| 1212 | * by __block_prepare_write() isn't a real problem here as we clear |
| 1213 | * the bit before releasing a page lock and thus writeback cannot |
| 1214 | * ever write the buffer. |
| 1215 | */ |
| 1216 | if (dirty) |
| 1217 | clear_buffer_dirty(bh); |
| 1218 | ret = ext3_journal_get_write_access(handle, bh); |
| 1219 | if (!ret && dirty) |
| 1220 | ret = ext3_journal_dirty_metadata(handle, bh); |
| 1221 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1222 | } |
| 1223 | |
Jan Kara | 68eb3db | 2009-12-01 16:53:06 +0100 | [diff] [blame] | 1224 | /* |
| 1225 | * Truncate blocks that were not used by write. We have to truncate the |
| 1226 | * pagecache as well so that corresponding buffers get properly unmapped. |
| 1227 | */ |
| 1228 | static void ext3_truncate_failed_write(struct inode *inode) |
| 1229 | { |
| 1230 | truncate_inode_pages(inode->i_mapping, inode->i_size); |
| 1231 | ext3_truncate(inode); |
| 1232 | } |
| 1233 | |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 1234 | /* |
| 1235 | * Truncate blocks that were not used by direct IO write. We have to zero out |
| 1236 | * the last file block as well because direct IO might have written to it. |
| 1237 | */ |
| 1238 | static void ext3_truncate_failed_direct_write(struct inode *inode) |
| 1239 | { |
| 1240 | ext3_block_truncate_page(inode, inode->i_size); |
| 1241 | ext3_truncate(inode); |
| 1242 | } |
| 1243 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1244 | static int ext3_write_begin(struct file *file, struct address_space *mapping, |
| 1245 | loff_t pos, unsigned len, unsigned flags, |
| 1246 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1247 | { |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1248 | struct inode *inode = mapping->host; |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1249 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1250 | handle_t *handle; |
| 1251 | int retries = 0; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1252 | struct page *page; |
| 1253 | pgoff_t index; |
| 1254 | unsigned from, to; |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1255 | /* Reserve one block more for addition to orphan list in case |
| 1256 | * we allocate blocks but write fails for some reason */ |
| 1257 | int needed_blocks = ext3_writepage_trans_blocks(inode) + 1; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1258 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1259 | trace_ext3_write_begin(inode, pos, len, flags); |
| 1260 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1261 | index = pos >> PAGE_CACHE_SHIFT; |
| 1262 | from = pos & (PAGE_CACHE_SIZE - 1); |
| 1263 | to = from + len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | |
| 1265 | retry: |
Nick Piggin | 54566b2 | 2009-01-04 12:00:53 -0800 | [diff] [blame] | 1266 | page = grab_cache_page_write_begin(mapping, index, flags); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1267 | if (!page) |
| 1268 | return -ENOMEM; |
| 1269 | *pagep = page; |
| 1270 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1271 | handle = ext3_journal_start(inode, needed_blocks); |
Andrew Morton | 1aa9b4b | 2007-04-01 23:49:43 -0700 | [diff] [blame] | 1272 | if (IS_ERR(handle)) { |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1273 | unlock_page(page); |
| 1274 | page_cache_release(page); |
Andrew Morton | 1aa9b4b | 2007-04-01 23:49:43 -0700 | [diff] [blame] | 1275 | ret = PTR_ERR(handle); |
| 1276 | goto out; |
| 1277 | } |
Christoph Hellwig | 6e1db88 | 2010-06-04 11:29:57 +0200 | [diff] [blame] | 1278 | ret = __block_write_begin(page, pos, len, ext3_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | if (ret) |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1280 | goto write_begin_failed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | |
| 1282 | if (ext3_should_journal_data(inode)) { |
| 1283 | ret = walk_page_buffers(handle, page_buffers(page), |
| 1284 | from, to, NULL, do_journal_get_write_access); |
| 1285 | } |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1286 | write_begin_failed: |
| 1287 | if (ret) { |
Aneesh Kumar K.V | 5ec8b75 | 2008-10-18 20:28:00 -0700 | [diff] [blame] | 1288 | /* |
| 1289 | * block_write_begin may have instantiated a few blocks |
| 1290 | * outside i_size. Trim these off again. Don't need |
| 1291 | * i_size_read because we hold i_mutex. |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1292 | * |
| 1293 | * Add inode to orphan list in case we crash before truncate |
Jan Kara | 9eaaa2d | 2009-07-13 20:26:52 +0200 | [diff] [blame] | 1294 | * finishes. Do this only if ext3_can_truncate() agrees so |
| 1295 | * that orphan processing code is happy. |
Aneesh Kumar K.V | 5ec8b75 | 2008-10-18 20:28:00 -0700 | [diff] [blame] | 1296 | */ |
Jan Kara | 9eaaa2d | 2009-07-13 20:26:52 +0200 | [diff] [blame] | 1297 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1298 | ext3_orphan_add(handle, inode); |
| 1299 | ext3_journal_stop(handle); |
| 1300 | unlock_page(page); |
| 1301 | page_cache_release(page); |
| 1302 | if (pos + len > inode->i_size) |
Jan Kara | 68eb3db | 2009-12-01 16:53:06 +0100 | [diff] [blame] | 1303 | ext3_truncate_failed_write(inode); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1304 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) |
| 1306 | goto retry; |
Andrew Morton | 1aa9b4b | 2007-04-01 23:49:43 -0700 | [diff] [blame] | 1307 | out: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1308 | return ret; |
| 1309 | } |
| 1310 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1311 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1312 | int ext3_journal_dirty_data(handle_t *handle, struct buffer_head *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | { |
| 1314 | int err = journal_dirty_data(handle, bh); |
| 1315 | if (err) |
Harvey Harrison | e05b6b5 | 2008-04-28 02:16:15 -0700 | [diff] [blame] | 1316 | ext3_journal_abort_handle(__func__, __func__, |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1317 | bh, handle, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | return err; |
| 1319 | } |
| 1320 | |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1321 | /* For ordered writepage and write_end functions */ |
| 1322 | static int journal_dirty_data_fn(handle_t *handle, struct buffer_head *bh) |
| 1323 | { |
| 1324 | /* |
| 1325 | * Write could have mapped the buffer but it didn't copy the data in |
| 1326 | * yet. So avoid filing such buffer into a transaction. |
| 1327 | */ |
| 1328 | if (buffer_mapped(bh) && buffer_uptodate(bh)) |
| 1329 | return ext3_journal_dirty_data(handle, bh); |
| 1330 | return 0; |
| 1331 | } |
| 1332 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1333 | /* For write_end() in data=journal mode */ |
| 1334 | static int write_end_fn(handle_t *handle, struct buffer_head *bh) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | { |
| 1336 | if (!buffer_mapped(bh) || buffer_freed(bh)) |
| 1337 | return 0; |
| 1338 | set_buffer_uptodate(bh); |
| 1339 | return ext3_journal_dirty_metadata(handle, bh); |
| 1340 | } |
| 1341 | |
| 1342 | /* |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1343 | * This is nasty and subtle: ext3_write_begin() could have allocated blocks |
| 1344 | * for the whole page but later we failed to copy the data in. Update inode |
| 1345 | * size according to what we managed to copy. The rest is going to be |
| 1346 | * truncated in write_end function. |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1347 | */ |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1348 | static void update_file_sizes(struct inode *inode, loff_t pos, unsigned copied) |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1349 | { |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1350 | /* What matters to us is i_disksize. We don't write i_size anywhere */ |
| 1351 | if (pos + copied > inode->i_size) |
| 1352 | i_size_write(inode, pos + copied); |
| 1353 | if (pos + copied > EXT3_I(inode)->i_disksize) { |
| 1354 | EXT3_I(inode)->i_disksize = pos + copied; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1355 | mark_inode_dirty(inode); |
| 1356 | } |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1357 | } |
| 1358 | |
| 1359 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1360 | * We need to pick up the new inode size which generic_commit_write gave us |
| 1361 | * `file' can be NULL - eg, when called from page_symlink(). |
| 1362 | * |
| 1363 | * ext3 never places buffers on inode->i_mapping->private_list. metadata |
| 1364 | * buffers are managed internally. |
| 1365 | */ |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1366 | static int ext3_ordered_write_end(struct file *file, |
| 1367 | struct address_space *mapping, |
| 1368 | loff_t pos, unsigned len, unsigned copied, |
| 1369 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | { |
| 1371 | handle_t *handle = ext3_journal_current_handle(); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1372 | struct inode *inode = file->f_mapping->host; |
| 1373 | unsigned from, to; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | int ret = 0, ret2; |
| 1375 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1376 | trace_ext3_ordered_write_end(inode, pos, len, copied); |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1377 | copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); |
| 1378 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1379 | from = pos & (PAGE_CACHE_SIZE - 1); |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1380 | to = from + copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1381 | ret = walk_page_buffers(handle, page_buffers(page), |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1382 | from, to, NULL, journal_dirty_data_fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1383 | |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1384 | if (ret == 0) |
| 1385 | update_file_sizes(inode, pos, copied); |
| 1386 | /* |
| 1387 | * There may be allocated blocks outside of i_size because |
| 1388 | * we failed to copy some data. Prepare for truncate. |
| 1389 | */ |
Jan Kara | 9eaaa2d | 2009-07-13 20:26:52 +0200 | [diff] [blame] | 1390 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1391 | ext3_orphan_add(handle, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1392 | ret2 = ext3_journal_stop(handle); |
| 1393 | if (!ret) |
| 1394 | ret = ret2; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1395 | unlock_page(page); |
| 1396 | page_cache_release(page); |
| 1397 | |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1398 | if (pos + len > inode->i_size) |
Jan Kara | 68eb3db | 2009-12-01 16:53:06 +0100 | [diff] [blame] | 1399 | ext3_truncate_failed_write(inode); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1400 | return ret ? ret : copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1401 | } |
| 1402 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1403 | static int ext3_writeback_write_end(struct file *file, |
| 1404 | struct address_space *mapping, |
| 1405 | loff_t pos, unsigned len, unsigned copied, |
| 1406 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1407 | { |
| 1408 | handle_t *handle = ext3_journal_current_handle(); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1409 | struct inode *inode = file->f_mapping->host; |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1410 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1411 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1412 | trace_ext3_writeback_write_end(inode, pos, len, copied); |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1413 | copied = block_write_end(file, mapping, pos, len, copied, page, fsdata); |
| 1414 | update_file_sizes(inode, pos, copied); |
| 1415 | /* |
| 1416 | * There may be allocated blocks outside of i_size because |
| 1417 | * we failed to copy some data. Prepare for truncate. |
| 1418 | */ |
Jan Kara | 9eaaa2d | 2009-07-13 20:26:52 +0200 | [diff] [blame] | 1419 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1420 | ext3_orphan_add(handle, inode); |
| 1421 | ret = ext3_journal_stop(handle); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1422 | unlock_page(page); |
| 1423 | page_cache_release(page); |
| 1424 | |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1425 | if (pos + len > inode->i_size) |
Jan Kara | 68eb3db | 2009-12-01 16:53:06 +0100 | [diff] [blame] | 1426 | ext3_truncate_failed_write(inode); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1427 | return ret ? ret : copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1428 | } |
| 1429 | |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1430 | static int ext3_journalled_write_end(struct file *file, |
| 1431 | struct address_space *mapping, |
| 1432 | loff_t pos, unsigned len, unsigned copied, |
| 1433 | struct page *page, void *fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | { |
| 1435 | handle_t *handle = ext3_journal_current_handle(); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1436 | struct inode *inode = mapping->host; |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 1437 | struct ext3_inode_info *ei = EXT3_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1438 | int ret = 0, ret2; |
| 1439 | int partial = 0; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1440 | unsigned from, to; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1442 | trace_ext3_journalled_write_end(inode, pos, len, copied); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1443 | from = pos & (PAGE_CACHE_SIZE - 1); |
| 1444 | to = from + len; |
| 1445 | |
| 1446 | if (copied < len) { |
| 1447 | if (!PageUptodate(page)) |
| 1448 | copied = 0; |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1449 | page_zero_new_buffers(page, from + copied, to); |
| 1450 | to = from + copied; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1451 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1452 | |
| 1453 | ret = walk_page_buffers(handle, page_buffers(page), from, |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1454 | to, &partial, write_end_fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1455 | if (!partial) |
| 1456 | SetPageUptodate(page); |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1457 | |
| 1458 | if (pos + copied > inode->i_size) |
| 1459 | i_size_write(inode, pos + copied); |
| 1460 | /* |
| 1461 | * There may be allocated blocks outside of i_size because |
| 1462 | * we failed to copy some data. Prepare for truncate. |
| 1463 | */ |
Jan Kara | 9eaaa2d | 2009-07-13 20:26:52 +0200 | [diff] [blame] | 1464 | if (pos + len > inode->i_size && ext3_can_truncate(inode)) |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1465 | ext3_orphan_add(handle, inode); |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 1466 | ext3_set_inode_state(inode, EXT3_STATE_JDATA); |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 1467 | atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); |
| 1468 | if (inode->i_size > ei->i_disksize) { |
| 1469 | ei->i_disksize = inode->i_size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | ret2 = ext3_mark_inode_dirty(handle, inode); |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1471 | if (!ret) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1472 | ret = ret2; |
| 1473 | } |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1474 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | ret2 = ext3_journal_stop(handle); |
| 1476 | if (!ret) |
| 1477 | ret = ret2; |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1478 | unlock_page(page); |
| 1479 | page_cache_release(page); |
| 1480 | |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1481 | if (pos + len > inode->i_size) |
Jan Kara | 68eb3db | 2009-12-01 16:53:06 +0100 | [diff] [blame] | 1482 | ext3_truncate_failed_write(inode); |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1483 | return ret ? ret : copied; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1484 | } |
| 1485 | |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1486 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | * bmap() is special. It gets used by applications such as lilo and by |
| 1488 | * the swapper to find the on-disk block of a specific piece of data. |
| 1489 | * |
| 1490 | * Naturally, this is dangerous if the block concerned is still in the |
| 1491 | * journal. If somebody makes a swapfile on an ext3 data-journaling |
| 1492 | * filesystem and enables swap, then they may get a nasty shock when the |
| 1493 | * data getting swapped to that swapfile suddenly gets overwritten by |
| 1494 | * the original zero's written out previously to the journal and |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1495 | * awaiting writeback in the kernel's buffer cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1496 | * |
| 1497 | * So, if we see any bmap calls here on a modified, data-journaled file, |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1498 | * take extra steps to flush any blocks which might be in the cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | */ |
| 1500 | static sector_t ext3_bmap(struct address_space *mapping, sector_t block) |
| 1501 | { |
| 1502 | struct inode *inode = mapping->host; |
| 1503 | journal_t *journal; |
| 1504 | int err; |
| 1505 | |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 1506 | if (ext3_test_inode_state(inode, EXT3_STATE_JDATA)) { |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1507 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1508 | * This is a REALLY heavyweight approach, but the use of |
| 1509 | * bmap on dirty files is expected to be extremely rare: |
| 1510 | * only if we run lilo or swapon on a freshly made file |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1511 | * do we expect this to happen. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1512 | * |
| 1513 | * (bmap requires CAP_SYS_RAWIO so this does not |
| 1514 | * represent an unprivileged user DOS attack --- we'd be |
| 1515 | * in trouble if mortal users could trigger this path at |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1516 | * will.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1517 | * |
| 1518 | * NB. EXT3_STATE_JDATA is not set on files other than |
| 1519 | * regular files. If somebody wants to bmap a directory |
| 1520 | * or symlink and gets confused because the buffer |
| 1521 | * hasn't yet been flushed to disk, they deserve |
| 1522 | * everything they get. |
| 1523 | */ |
| 1524 | |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 1525 | ext3_clear_inode_state(inode, EXT3_STATE_JDATA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | journal = EXT3_JOURNAL(inode); |
| 1527 | journal_lock_updates(journal); |
| 1528 | err = journal_flush(journal); |
| 1529 | journal_unlock_updates(journal); |
| 1530 | |
| 1531 | if (err) |
| 1532 | return 0; |
| 1533 | } |
| 1534 | |
| 1535 | return generic_block_bmap(mapping,block,ext3_get_block); |
| 1536 | } |
| 1537 | |
| 1538 | static int bget_one(handle_t *handle, struct buffer_head *bh) |
| 1539 | { |
| 1540 | get_bh(bh); |
| 1541 | return 0; |
| 1542 | } |
| 1543 | |
| 1544 | static int bput_one(handle_t *handle, struct buffer_head *bh) |
| 1545 | { |
| 1546 | put_bh(bh); |
| 1547 | return 0; |
| 1548 | } |
| 1549 | |
Jan Kara | 9e80d40 | 2009-03-26 13:08:04 +0100 | [diff] [blame] | 1550 | static int buffer_unmapped(handle_t *handle, struct buffer_head *bh) |
| 1551 | { |
| 1552 | return !buffer_mapped(bh); |
| 1553 | } |
Jan Kara | 695f6ae | 2009-04-02 16:57:17 -0700 | [diff] [blame] | 1554 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | /* |
| 1556 | * Note that we always start a transaction even if we're not journalling |
| 1557 | * data. This is to preserve ordering: any hole instantiation within |
| 1558 | * __block_write_full_page -> ext3_get_block() should be journalled |
| 1559 | * along with the data so we don't crash and then get metadata which |
| 1560 | * refers to old data. |
| 1561 | * |
| 1562 | * In all journalling modes block_write_full_page() will start the I/O. |
| 1563 | * |
| 1564 | * Problem: |
| 1565 | * |
| 1566 | * ext3_writepage() -> kmalloc() -> __alloc_pages() -> page_launder() -> |
| 1567 | * ext3_writepage() |
| 1568 | * |
| 1569 | * Similar for: |
| 1570 | * |
| 1571 | * ext3_file_write() -> generic_file_write() -> __alloc_pages() -> ... |
| 1572 | * |
| 1573 | * Same applies to ext3_get_block(). We will deadlock on various things like |
Arjan van de Ven | 9746151 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 1574 | * lock_journal and i_truncate_mutex. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1575 | * |
| 1576 | * Setting PF_MEMALLOC here doesn't work - too many internal memory |
| 1577 | * allocations fail. |
| 1578 | * |
| 1579 | * 16May01: If we're reentered then journal_current_handle() will be |
| 1580 | * non-zero. We simply *return*. |
| 1581 | * |
| 1582 | * 1 July 2001: @@@ FIXME: |
| 1583 | * In journalled data mode, a data buffer may be metadata against the |
| 1584 | * current transaction. But the same file is part of a shared mapping |
| 1585 | * and someone does a writepage() on it. |
| 1586 | * |
| 1587 | * We will move the buffer onto the async_data list, but *after* it has |
| 1588 | * been dirtied. So there's a small window where we have dirty data on |
| 1589 | * BJ_Metadata. |
| 1590 | * |
| 1591 | * Note that this only applies to the last partial page in the file. The |
| 1592 | * bit which block_write_full_page() uses prepare/commit for. (That's |
| 1593 | * broken code anyway: it's wrong for msync()). |
| 1594 | * |
| 1595 | * It's a rare case: affects the final partial page, for journalled data |
| 1596 | * where the file is subject to bith write() and writepage() in the same |
| 1597 | * transction. To fix it we'll need a custom block_write_full_page(). |
| 1598 | * We'll probably need that anyway for journalling writepage() output. |
| 1599 | * |
| 1600 | * We don't honour synchronous mounts for writepage(). That would be |
| 1601 | * disastrous. Any write() or metadata operation will sync the fs for |
| 1602 | * us. |
| 1603 | * |
| 1604 | * AKPM2: if all the page's buffers are mapped to disk and !data=journal, |
| 1605 | * we don't need to open a transaction here. |
| 1606 | */ |
| 1607 | static int ext3_ordered_writepage(struct page *page, |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 1608 | struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1609 | { |
| 1610 | struct inode *inode = page->mapping->host; |
| 1611 | struct buffer_head *page_bufs; |
| 1612 | handle_t *handle = NULL; |
| 1613 | int ret = 0; |
| 1614 | int err; |
| 1615 | |
| 1616 | J_ASSERT(PageLocked(page)); |
Jan Kara | 33c104d | 2011-12-22 16:49:05 +0100 | [diff] [blame] | 1617 | /* |
| 1618 | * We don't want to warn for emergency remount. The condition is |
| 1619 | * ordered to avoid dereferencing inode->i_sb in non-error case to |
| 1620 | * avoid slow-downs. |
| 1621 | */ |
| 1622 | WARN_ON_ONCE(IS_RDONLY(inode) && |
| 1623 | !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1624 | |
| 1625 | /* |
| 1626 | * We give up here if we're reentered, because it might be for a |
| 1627 | * different filesystem. |
| 1628 | */ |
| 1629 | if (ext3_journal_current_handle()) |
| 1630 | goto out_fail; |
| 1631 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1632 | trace_ext3_ordered_writepage(page); |
Jan Kara | 9e80d40 | 2009-03-26 13:08:04 +0100 | [diff] [blame] | 1633 | if (!page_has_buffers(page)) { |
| 1634 | create_empty_buffers(page, inode->i_sb->s_blocksize, |
| 1635 | (1 << BH_Dirty)|(1 << BH_Uptodate)); |
Jan Kara | 430db32 | 2009-04-07 18:25:01 -0400 | [diff] [blame] | 1636 | page_bufs = page_buffers(page); |
| 1637 | } else { |
| 1638 | page_bufs = page_buffers(page); |
| 1639 | if (!walk_page_buffers(NULL, page_bufs, 0, PAGE_CACHE_SIZE, |
| 1640 | NULL, buffer_unmapped)) { |
| 1641 | /* Provide NULL get_block() to catch bugs if buffers |
| 1642 | * weren't really mapped */ |
| 1643 | return block_write_full_page(page, NULL, wbc); |
| 1644 | } |
Jan Kara | 9e80d40 | 2009-03-26 13:08:04 +0100 | [diff] [blame] | 1645 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1646 | handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); |
| 1647 | |
| 1648 | if (IS_ERR(handle)) { |
| 1649 | ret = PTR_ERR(handle); |
| 1650 | goto out_fail; |
| 1651 | } |
| 1652 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | walk_page_buffers(handle, page_bufs, 0, |
| 1654 | PAGE_CACHE_SIZE, NULL, bget_one); |
| 1655 | |
| 1656 | ret = block_write_full_page(page, ext3_get_block, wbc); |
| 1657 | |
| 1658 | /* |
| 1659 | * The page can become unlocked at any point now, and |
| 1660 | * truncate can then come in and change things. So we |
| 1661 | * can't touch *page from now on. But *page_bufs is |
| 1662 | * safe due to elevated refcount. |
| 1663 | */ |
| 1664 | |
| 1665 | /* |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 1666 | * And attach them to the current transaction. But only if |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1667 | * block_write_full_page() succeeded. Otherwise they are unmapped, |
| 1668 | * and generally junk. |
| 1669 | */ |
| 1670 | if (ret == 0) { |
| 1671 | err = walk_page_buffers(handle, page_bufs, 0, PAGE_CACHE_SIZE, |
| 1672 | NULL, journal_dirty_data_fn); |
| 1673 | if (!ret) |
| 1674 | ret = err; |
| 1675 | } |
| 1676 | walk_page_buffers(handle, page_bufs, 0, |
| 1677 | PAGE_CACHE_SIZE, NULL, bput_one); |
| 1678 | err = ext3_journal_stop(handle); |
| 1679 | if (!ret) |
| 1680 | ret = err; |
| 1681 | return ret; |
| 1682 | |
| 1683 | out_fail: |
| 1684 | redirty_page_for_writepage(wbc, page); |
| 1685 | unlock_page(page); |
| 1686 | return ret; |
| 1687 | } |
| 1688 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1689 | static int ext3_writeback_writepage(struct page *page, |
| 1690 | struct writeback_control *wbc) |
| 1691 | { |
| 1692 | struct inode *inode = page->mapping->host; |
| 1693 | handle_t *handle = NULL; |
| 1694 | int ret = 0; |
| 1695 | int err; |
| 1696 | |
Dmitry Monakhov | 49792c8 | 2010-03-02 15:51:02 +0300 | [diff] [blame] | 1697 | J_ASSERT(PageLocked(page)); |
Jan Kara | 33c104d | 2011-12-22 16:49:05 +0100 | [diff] [blame] | 1698 | /* |
| 1699 | * We don't want to warn for emergency remount. The condition is |
| 1700 | * ordered to avoid dereferencing inode->i_sb in non-error case to |
| 1701 | * avoid slow-downs. |
| 1702 | */ |
| 1703 | WARN_ON_ONCE(IS_RDONLY(inode) && |
| 1704 | !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); |
Dmitry Monakhov | 49792c8 | 2010-03-02 15:51:02 +0300 | [diff] [blame] | 1705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1706 | if (ext3_journal_current_handle()) |
| 1707 | goto out_fail; |
| 1708 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1709 | trace_ext3_writeback_writepage(page); |
Jan Kara | 430db32 | 2009-04-07 18:25:01 -0400 | [diff] [blame] | 1710 | if (page_has_buffers(page)) { |
| 1711 | if (!walk_page_buffers(NULL, page_buffers(page), 0, |
| 1712 | PAGE_CACHE_SIZE, NULL, buffer_unmapped)) { |
| 1713 | /* Provide NULL get_block() to catch bugs if buffers |
| 1714 | * weren't really mapped */ |
| 1715 | return block_write_full_page(page, NULL, wbc); |
| 1716 | } |
| 1717 | } |
| 1718 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1719 | handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); |
| 1720 | if (IS_ERR(handle)) { |
| 1721 | ret = PTR_ERR(handle); |
| 1722 | goto out_fail; |
| 1723 | } |
| 1724 | |
Christoph Hellwig | 4c4d390 | 2010-06-07 10:20:39 +0200 | [diff] [blame] | 1725 | ret = block_write_full_page(page, ext3_get_block, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1726 | |
| 1727 | err = ext3_journal_stop(handle); |
| 1728 | if (!ret) |
| 1729 | ret = err; |
| 1730 | return ret; |
| 1731 | |
| 1732 | out_fail: |
| 1733 | redirty_page_for_writepage(wbc, page); |
| 1734 | unlock_page(page); |
| 1735 | return ret; |
| 1736 | } |
| 1737 | |
| 1738 | static int ext3_journalled_writepage(struct page *page, |
| 1739 | struct writeback_control *wbc) |
| 1740 | { |
| 1741 | struct inode *inode = page->mapping->host; |
| 1742 | handle_t *handle = NULL; |
| 1743 | int ret = 0; |
| 1744 | int err; |
| 1745 | |
Dmitry Monakhov | 49792c8 | 2010-03-02 15:51:02 +0300 | [diff] [blame] | 1746 | J_ASSERT(PageLocked(page)); |
Jan Kara | 33c104d | 2011-12-22 16:49:05 +0100 | [diff] [blame] | 1747 | /* |
| 1748 | * We don't want to warn for emergency remount. The condition is |
| 1749 | * ordered to avoid dereferencing inode->i_sb in non-error case to |
| 1750 | * avoid slow-downs. |
| 1751 | */ |
| 1752 | WARN_ON_ONCE(IS_RDONLY(inode) && |
| 1753 | !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS)); |
Dmitry Monakhov | 49792c8 | 2010-03-02 15:51:02 +0300 | [diff] [blame] | 1754 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1755 | if (ext3_journal_current_handle()) |
| 1756 | goto no_write; |
| 1757 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1758 | trace_ext3_journalled_writepage(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1759 | handle = ext3_journal_start(inode, ext3_writepage_trans_blocks(inode)); |
| 1760 | if (IS_ERR(handle)) { |
| 1761 | ret = PTR_ERR(handle); |
| 1762 | goto no_write; |
| 1763 | } |
| 1764 | |
| 1765 | if (!page_has_buffers(page) || PageChecked(page)) { |
| 1766 | /* |
| 1767 | * It's mmapped pagecache. Add buffers and journal it. There |
| 1768 | * doesn't seem much point in redirtying the page here. |
| 1769 | */ |
| 1770 | ClearPageChecked(page); |
Christoph Hellwig | ebdec24 | 2010-10-06 10:47:23 +0200 | [diff] [blame] | 1771 | ret = __block_write_begin(page, 0, PAGE_CACHE_SIZE, |
| 1772 | ext3_get_block); |
Denis Lunev | ab4eb43 | 2005-11-13 16:07:17 -0800 | [diff] [blame] | 1773 | if (ret != 0) { |
| 1774 | ext3_journal_stop(handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1775 | goto out_unlock; |
Denis Lunev | ab4eb43 | 2005-11-13 16:07:17 -0800 | [diff] [blame] | 1776 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1777 | ret = walk_page_buffers(handle, page_buffers(page), 0, |
| 1778 | PAGE_CACHE_SIZE, NULL, do_journal_get_write_access); |
| 1779 | |
| 1780 | err = walk_page_buffers(handle, page_buffers(page), 0, |
Nick Piggin | f4fc66a | 2007-10-16 01:25:05 -0700 | [diff] [blame] | 1781 | PAGE_CACHE_SIZE, NULL, write_end_fn); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1782 | if (ret == 0) |
| 1783 | ret = err; |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 1784 | ext3_set_inode_state(inode, EXT3_STATE_JDATA); |
Jan Kara | b22570d | 2011-07-23 01:21:38 +0200 | [diff] [blame] | 1785 | atomic_set(&EXT3_I(inode)->i_datasync_tid, |
| 1786 | handle->h_transaction->t_tid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | unlock_page(page); |
| 1788 | } else { |
| 1789 | /* |
| 1790 | * It may be a page full of checkpoint-mode buffers. We don't |
| 1791 | * really know unless we go poke around in the buffer_heads. |
| 1792 | * But block_write_full_page will do the right thing. |
| 1793 | */ |
| 1794 | ret = block_write_full_page(page, ext3_get_block, wbc); |
| 1795 | } |
| 1796 | err = ext3_journal_stop(handle); |
| 1797 | if (!ret) |
| 1798 | ret = err; |
| 1799 | out: |
| 1800 | return ret; |
| 1801 | |
| 1802 | no_write: |
| 1803 | redirty_page_for_writepage(wbc, page); |
| 1804 | out_unlock: |
| 1805 | unlock_page(page); |
| 1806 | goto out; |
| 1807 | } |
| 1808 | |
| 1809 | static int ext3_readpage(struct file *file, struct page *page) |
| 1810 | { |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1811 | trace_ext3_readpage(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1812 | return mpage_readpage(page, ext3_get_block); |
| 1813 | } |
| 1814 | |
| 1815 | static int |
| 1816 | ext3_readpages(struct file *file, struct address_space *mapping, |
| 1817 | struct list_head *pages, unsigned nr_pages) |
| 1818 | { |
| 1819 | return mpage_readpages(mapping, pages, nr_pages, ext3_get_block); |
| 1820 | } |
| 1821 | |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 1822 | static void ext3_invalidatepage(struct page *page, unsigned long offset) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | { |
| 1824 | journal_t *journal = EXT3_JOURNAL(page->mapping->host); |
| 1825 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1826 | trace_ext3_invalidatepage(page, offset); |
| 1827 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1828 | /* |
| 1829 | * If it's a full truncate we just forget about the pending dirtying |
| 1830 | */ |
| 1831 | if (offset == 0) |
| 1832 | ClearPageChecked(page); |
| 1833 | |
NeilBrown | 2ff28e2 | 2006-03-26 01:37:18 -0800 | [diff] [blame] | 1834 | journal_invalidatepage(journal, page, offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1835 | } |
| 1836 | |
Al Viro | 27496a8 | 2005-10-21 03:20:48 -0400 | [diff] [blame] | 1837 | static int ext3_releasepage(struct page *page, gfp_t wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1838 | { |
| 1839 | journal_t *journal = EXT3_JOURNAL(page->mapping->host); |
| 1840 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1841 | trace_ext3_releasepage(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1842 | WARN_ON(PageChecked(page)); |
| 1843 | if (!page_has_buffers(page)) |
| 1844 | return 0; |
| 1845 | return journal_try_to_free_buffers(journal, page, wait); |
| 1846 | } |
| 1847 | |
| 1848 | /* |
| 1849 | * If the O_DIRECT write will extend the file then add this inode to the |
| 1850 | * orphan list. So recovery will truncate it back to the original size |
| 1851 | * if the machine crashes during the write. |
| 1852 | * |
| 1853 | * If the O_DIRECT write is intantiating holes inside i_size and the machine |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1854 | * crashes then stale disk data _may_ be exposed inside the file. But current |
| 1855 | * VFS code falls back into buffered path in that case so we are safe. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1856 | */ |
| 1857 | static ssize_t ext3_direct_IO(int rw, struct kiocb *iocb, |
| 1858 | const struct iovec *iov, loff_t offset, |
| 1859 | unsigned long nr_segs) |
| 1860 | { |
| 1861 | struct file *file = iocb->ki_filp; |
| 1862 | struct inode *inode = file->f_mapping->host; |
| 1863 | struct ext3_inode_info *ei = EXT3_I(inode); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1864 | handle_t *handle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | ssize_t ret; |
| 1866 | int orphan = 0; |
| 1867 | size_t count = iov_length(iov, nr_segs); |
Eric Sandeen | ea0174a | 2009-10-12 21:34:27 -0500 | [diff] [blame] | 1868 | int retries = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1869 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1870 | trace_ext3_direct_IO_enter(inode, offset, iov_length(iov, nr_segs), rw); |
| 1871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1872 | if (rw == WRITE) { |
| 1873 | loff_t final_size = offset + count; |
| 1874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1875 | if (final_size > inode->i_size) { |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1876 | /* Credits for sb + inode write */ |
| 1877 | handle = ext3_journal_start(inode, 2); |
| 1878 | if (IS_ERR(handle)) { |
| 1879 | ret = PTR_ERR(handle); |
| 1880 | goto out; |
| 1881 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | ret = ext3_orphan_add(handle, inode); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1883 | if (ret) { |
| 1884 | ext3_journal_stop(handle); |
| 1885 | goto out; |
| 1886 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | orphan = 1; |
| 1888 | ei->i_disksize = inode->i_size; |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1889 | ext3_journal_stop(handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | } |
| 1891 | } |
| 1892 | |
Eric Sandeen | ea0174a | 2009-10-12 21:34:27 -0500 | [diff] [blame] | 1893 | retry: |
Christoph Hellwig | aacfc19c | 2011-06-24 14:29:47 -0400 | [diff] [blame] | 1894 | ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
| 1895 | ext3_get_block); |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1896 | /* |
| 1897 | * In case of error extending write may have instantiated a few |
| 1898 | * blocks outside i_size. Trim these off again. |
| 1899 | */ |
| 1900 | if (unlikely((rw & WRITE) && ret < 0)) { |
| 1901 | loff_t isize = i_size_read(inode); |
| 1902 | loff_t end = offset + iov_length(iov, nr_segs); |
| 1903 | |
| 1904 | if (end > isize) |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 1905 | ext3_truncate_failed_direct_write(inode); |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 1906 | } |
Eric Sandeen | ea0174a | 2009-10-12 21:34:27 -0500 | [diff] [blame] | 1907 | if (ret == -ENOSPC && ext3_should_retry_alloc(inode->i_sb, &retries)) |
| 1908 | goto retry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1909 | |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1910 | if (orphan) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1911 | int err; |
| 1912 | |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1913 | /* Credits for sb + inode write */ |
| 1914 | handle = ext3_journal_start(inode, 2); |
| 1915 | if (IS_ERR(handle)) { |
| 1916 | /* This is really bad luck. We've written the data |
Jan Kara | 7eb4969 | 2010-03-01 14:02:37 +0100 | [diff] [blame] | 1917 | * but cannot extend i_size. Truncate allocated blocks |
| 1918 | * and pretend the write failed... */ |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 1919 | ext3_truncate_failed_direct_write(inode); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1920 | ret = PTR_ERR(handle); |
| 1921 | goto out; |
| 1922 | } |
| 1923 | if (inode->i_nlink) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1924 | ext3_orphan_del(handle, inode); |
Jan Kara | bd1939d | 2008-02-06 01:40:21 -0800 | [diff] [blame] | 1925 | if (ret > 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1926 | loff_t end = offset + ret; |
| 1927 | if (end > inode->i_size) { |
| 1928 | ei->i_disksize = end; |
| 1929 | i_size_write(inode, end); |
| 1930 | /* |
| 1931 | * We're going to return a positive `ret' |
| 1932 | * here due to non-zero-length I/O, so there's |
| 1933 | * no way of reporting error returns from |
| 1934 | * ext3_mark_inode_dirty() to userspace. So |
| 1935 | * ignore it. |
| 1936 | */ |
| 1937 | ext3_mark_inode_dirty(handle, inode); |
| 1938 | } |
| 1939 | } |
| 1940 | err = ext3_journal_stop(handle); |
| 1941 | if (ret == 0) |
| 1942 | ret = err; |
| 1943 | } |
| 1944 | out: |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 1945 | trace_ext3_direct_IO_exit(inode, offset, |
| 1946 | iov_length(iov, nr_segs), rw, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1947 | return ret; |
| 1948 | } |
| 1949 | |
| 1950 | /* |
| 1951 | * Pages can be marked dirty completely asynchronously from ext3's journalling |
| 1952 | * activity. By filemap_sync_pte(), try_to_unmap_one(), etc. We cannot do |
| 1953 | * much here because ->set_page_dirty is called under VFS locks. The page is |
| 1954 | * not necessarily locked. |
| 1955 | * |
| 1956 | * We cannot just dirty the page and leave attached buffers clean, because the |
| 1957 | * buffers' dirty state is "definitive". We cannot just set the buffers dirty |
| 1958 | * or jbddirty because all the journalling code will explode. |
| 1959 | * |
| 1960 | * So what we do is to mark the page "pending dirty" and next time writepage |
| 1961 | * is called, propagate that into the buffers appropriately. |
| 1962 | */ |
| 1963 | static int ext3_journalled_set_page_dirty(struct page *page) |
| 1964 | { |
| 1965 | SetPageChecked(page); |
| 1966 | return __set_page_dirty_nobuffers(page); |
| 1967 | } |
| 1968 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1969 | static const struct address_space_operations ext3_ordered_aops = { |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 1970 | .readpage = ext3_readpage, |
| 1971 | .readpages = ext3_readpages, |
| 1972 | .writepage = ext3_ordered_writepage, |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 1973 | .write_begin = ext3_write_begin, |
| 1974 | .write_end = ext3_ordered_write_end, |
| 1975 | .bmap = ext3_bmap, |
| 1976 | .invalidatepage = ext3_invalidatepage, |
| 1977 | .releasepage = ext3_releasepage, |
| 1978 | .direct_IO = ext3_direct_IO, |
| 1979 | .migratepage = buffer_migrate_page, |
| 1980 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1981 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1982 | }; |
| 1983 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1984 | static const struct address_space_operations ext3_writeback_aops = { |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 1985 | .readpage = ext3_readpage, |
| 1986 | .readpages = ext3_readpages, |
| 1987 | .writepage = ext3_writeback_writepage, |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 1988 | .write_begin = ext3_write_begin, |
| 1989 | .write_end = ext3_writeback_write_end, |
| 1990 | .bmap = ext3_bmap, |
| 1991 | .invalidatepage = ext3_invalidatepage, |
| 1992 | .releasepage = ext3_releasepage, |
| 1993 | .direct_IO = ext3_direct_IO, |
| 1994 | .migratepage = buffer_migrate_page, |
| 1995 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 1996 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1997 | }; |
| 1998 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 1999 | static const struct address_space_operations ext3_journalled_aops = { |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 2000 | .readpage = ext3_readpage, |
| 2001 | .readpages = ext3_readpages, |
| 2002 | .writepage = ext3_journalled_writepage, |
Hisashi Hifumi | 8ab22b9 | 2008-07-28 15:46:36 -0700 | [diff] [blame] | 2003 | .write_begin = ext3_write_begin, |
| 2004 | .write_end = ext3_journalled_write_end, |
| 2005 | .set_page_dirty = ext3_journalled_set_page_dirty, |
| 2006 | .bmap = ext3_bmap, |
| 2007 | .invalidatepage = ext3_invalidatepage, |
| 2008 | .releasepage = ext3_releasepage, |
| 2009 | .is_partially_uptodate = block_is_partially_uptodate, |
Andi Kleen | aa261f5 | 2009-09-16 11:50:16 +0200 | [diff] [blame] | 2010 | .error_remove_page = generic_error_remove_page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2011 | }; |
| 2012 | |
| 2013 | void ext3_set_aops(struct inode *inode) |
| 2014 | { |
| 2015 | if (ext3_should_order_data(inode)) |
| 2016 | inode->i_mapping->a_ops = &ext3_ordered_aops; |
| 2017 | else if (ext3_should_writeback_data(inode)) |
| 2018 | inode->i_mapping->a_ops = &ext3_writeback_aops; |
| 2019 | else |
| 2020 | inode->i_mapping->a_ops = &ext3_journalled_aops; |
| 2021 | } |
| 2022 | |
| 2023 | /* |
| 2024 | * ext3_block_truncate_page() zeroes out a mapping from file offset `from' |
| 2025 | * up to the end of the block which corresponds to `from'. |
| 2026 | * This required during truncate. We need to physically zero the tail end |
| 2027 | * of that block so it doesn't yield old data if the file is later grown. |
| 2028 | */ |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2029 | static int ext3_block_truncate_page(struct inode *inode, loff_t from) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2030 | { |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2031 | ext3_fsblk_t index = from >> PAGE_CACHE_SHIFT; |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2032 | unsigned offset = from & (PAGE_CACHE_SIZE - 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2033 | unsigned blocksize, iblock, length, pos; |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2034 | struct page *page; |
| 2035 | handle_t *handle = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2036 | struct buffer_head *bh; |
| 2037 | int err = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2038 | |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2039 | /* Truncated on block boundary - nothing to do */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2040 | blocksize = inode->i_sb->s_blocksize; |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2041 | if ((from & (blocksize - 1)) == 0) |
| 2042 | return 0; |
| 2043 | |
| 2044 | page = grab_cache_page(inode->i_mapping, index); |
| 2045 | if (!page) |
| 2046 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2047 | length = blocksize - (offset & (blocksize - 1)); |
| 2048 | iblock = index << (PAGE_CACHE_SHIFT - inode->i_sb->s_blocksize_bits); |
| 2049 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2050 | if (!page_has_buffers(page)) |
| 2051 | create_empty_buffers(page, blocksize, 0); |
| 2052 | |
| 2053 | /* Find the buffer that contains "offset" */ |
| 2054 | bh = page_buffers(page); |
| 2055 | pos = blocksize; |
| 2056 | while (offset >= pos) { |
| 2057 | bh = bh->b_this_page; |
| 2058 | iblock++; |
| 2059 | pos += blocksize; |
| 2060 | } |
| 2061 | |
| 2062 | err = 0; |
| 2063 | if (buffer_freed(bh)) { |
| 2064 | BUFFER_TRACE(bh, "freed: skip"); |
| 2065 | goto unlock; |
| 2066 | } |
| 2067 | |
| 2068 | if (!buffer_mapped(bh)) { |
| 2069 | BUFFER_TRACE(bh, "unmapped"); |
| 2070 | ext3_get_block(inode, iblock, bh, 0); |
| 2071 | /* unmapped? It's a hole - nothing to do */ |
| 2072 | if (!buffer_mapped(bh)) { |
| 2073 | BUFFER_TRACE(bh, "still unmapped"); |
| 2074 | goto unlock; |
| 2075 | } |
| 2076 | } |
| 2077 | |
| 2078 | /* Ok, it's mapped. Make sure it's up-to-date */ |
| 2079 | if (PageUptodate(page)) |
| 2080 | set_buffer_uptodate(bh); |
| 2081 | |
Zheng Liu | d03e129 | 2011-12-05 15:55:11 +0800 | [diff] [blame] | 2082 | if (!bh_uptodate_or_lock(bh)) { |
| 2083 | err = bh_submit_read(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2084 | /* Uhhuh. Read error. Complain and punt. */ |
Zheng Liu | d03e129 | 2011-12-05 15:55:11 +0800 | [diff] [blame] | 2085 | if (err) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2086 | goto unlock; |
| 2087 | } |
| 2088 | |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2089 | /* data=writeback mode doesn't need transaction to zero-out data */ |
| 2090 | if (!ext3_should_writeback_data(inode)) { |
| 2091 | /* We journal at most one block */ |
| 2092 | handle = ext3_journal_start(inode, 1); |
| 2093 | if (IS_ERR(handle)) { |
| 2094 | clear_highpage(page); |
| 2095 | flush_dcache_page(page); |
| 2096 | err = PTR_ERR(handle); |
| 2097 | goto unlock; |
| 2098 | } |
| 2099 | } |
| 2100 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2101 | if (ext3_should_journal_data(inode)) { |
| 2102 | BUFFER_TRACE(bh, "get write access"); |
| 2103 | err = ext3_journal_get_write_access(handle, bh); |
| 2104 | if (err) |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2105 | goto stop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2106 | } |
| 2107 | |
Christoph Lameter | eebd2aa | 2008-02-04 22:28:29 -0800 | [diff] [blame] | 2108 | zero_user(page, offset, length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2109 | BUFFER_TRACE(bh, "zeroed end of block"); |
| 2110 | |
| 2111 | err = 0; |
| 2112 | if (ext3_should_journal_data(inode)) { |
| 2113 | err = ext3_journal_dirty_metadata(handle, bh); |
| 2114 | } else { |
| 2115 | if (ext3_should_order_data(inode)) |
| 2116 | err = ext3_journal_dirty_data(handle, bh); |
| 2117 | mark_buffer_dirty(bh); |
| 2118 | } |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2119 | stop: |
| 2120 | if (handle) |
| 2121 | ext3_journal_stop(handle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2122 | |
| 2123 | unlock: |
| 2124 | unlock_page(page); |
| 2125 | page_cache_release(page); |
| 2126 | return err; |
| 2127 | } |
| 2128 | |
| 2129 | /* |
| 2130 | * Probably it should be a library function... search for first non-zero word |
| 2131 | * or memcmp with zero_page, whatever is better for particular architecture. |
| 2132 | * Linus? |
| 2133 | */ |
| 2134 | static inline int all_zeroes(__le32 *p, __le32 *q) |
| 2135 | { |
| 2136 | while (p < q) |
| 2137 | if (*p++) |
| 2138 | return 0; |
| 2139 | return 1; |
| 2140 | } |
| 2141 | |
| 2142 | /** |
| 2143 | * ext3_find_shared - find the indirect blocks for partial truncation. |
| 2144 | * @inode: inode in question |
| 2145 | * @depth: depth of the affected branch |
| 2146 | * @offsets: offsets of pointers in that branch (see ext3_block_to_path) |
| 2147 | * @chain: place to store the pointers to partial indirect blocks |
| 2148 | * @top: place to the (detached) top of branch |
| 2149 | * |
| 2150 | * This is a helper function used by ext3_truncate(). |
| 2151 | * |
| 2152 | * When we do truncate() we may have to clean the ends of several |
| 2153 | * indirect blocks but leave the blocks themselves alive. Block is |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2154 | * partially truncated if some data below the new i_size is referred |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2155 | * from it (and it is on the path to the first completely truncated |
| 2156 | * data block, indeed). We have to free the top of that path along |
| 2157 | * with everything to the right of the path. Since no allocation |
| 2158 | * past the truncation point is possible until ext3_truncate() |
| 2159 | * finishes, we may safely do the latter, but top of branch may |
| 2160 | * require special attention - pageout below the truncation point |
| 2161 | * might try to populate it. |
| 2162 | * |
| 2163 | * We atomically detach the top of branch from the tree, store the |
| 2164 | * block number of its root in *@top, pointers to buffer_heads of |
| 2165 | * partially truncated blocks - in @chain[].bh and pointers to |
| 2166 | * their last elements that should not be removed - in |
| 2167 | * @chain[].p. Return value is the pointer to last filled element |
| 2168 | * of @chain. |
| 2169 | * |
| 2170 | * The work left to caller to do the actual freeing of subtrees: |
| 2171 | * a) free the subtree starting from *@top |
| 2172 | * b) free the subtrees whose roots are stored in |
| 2173 | * (@chain[i].p+1 .. end of @chain[i].bh->b_data) |
| 2174 | * c) free the subtrees growing from the inode past the @chain[0]. |
| 2175 | * (no partially truncated stuff there). */ |
| 2176 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2177 | static Indirect *ext3_find_shared(struct inode *inode, int depth, |
| 2178 | int offsets[4], Indirect chain[4], __le32 *top) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2179 | { |
| 2180 | Indirect *partial, *p; |
| 2181 | int k, err; |
| 2182 | |
| 2183 | *top = 0; |
Uwe Kleine-König | bf48aab | 2009-10-28 20:11:03 +0100 | [diff] [blame] | 2184 | /* Make k index the deepest non-null offset + 1 */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2185 | for (k = depth; k > 1 && !offsets[k-1]; k--) |
| 2186 | ; |
| 2187 | partial = ext3_get_branch(inode, k, offsets, chain, &err); |
| 2188 | /* Writer: pointers */ |
| 2189 | if (!partial) |
| 2190 | partial = chain + k-1; |
| 2191 | /* |
| 2192 | * If the branch acquired continuation since we've looked at it - |
| 2193 | * fine, it should all survive and (new) top doesn't belong to us. |
| 2194 | */ |
| 2195 | if (!partial->key && *partial->p) |
| 2196 | /* Writer: end */ |
| 2197 | goto no_top; |
| 2198 | for (p=partial; p>chain && all_zeroes((__le32*)p->bh->b_data,p->p); p--) |
| 2199 | ; |
| 2200 | /* |
| 2201 | * OK, we've found the last block that must survive. The rest of our |
| 2202 | * branch should be detached before unlocking. However, if that rest |
| 2203 | * of branch is all ours and does not grow immediately from the inode |
| 2204 | * it's easier to cheat and just decrement partial->p. |
| 2205 | */ |
| 2206 | if (p == chain + k - 1 && p > chain) { |
| 2207 | p->p--; |
| 2208 | } else { |
| 2209 | *top = *p->p; |
| 2210 | /* Nope, don't do this in ext3. Must leave the tree intact */ |
| 2211 | #if 0 |
| 2212 | *p->p = 0; |
| 2213 | #endif |
| 2214 | } |
| 2215 | /* Writer: end */ |
| 2216 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2217 | while(partial > p) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2218 | brelse(partial->bh); |
| 2219 | partial--; |
| 2220 | } |
| 2221 | no_top: |
| 2222 | return partial; |
| 2223 | } |
| 2224 | |
| 2225 | /* |
| 2226 | * Zero a number of block pointers in either an inode or an indirect block. |
| 2227 | * If we restart the transaction we must again get write access to the |
| 2228 | * indirect block for further modification. |
| 2229 | * |
| 2230 | * We release `count' blocks on disk, but (last - first) may be greater |
| 2231 | * than `count' because there can be holes in there. |
| 2232 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2233 | static void ext3_clear_blocks(handle_t *handle, struct inode *inode, |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2234 | struct buffer_head *bh, ext3_fsblk_t block_to_free, |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2235 | unsigned long count, __le32 *first, __le32 *last) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2236 | { |
| 2237 | __le32 *p; |
| 2238 | if (try_to_extend_transaction(handle, inode)) { |
| 2239 | if (bh) { |
| 2240 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); |
Namhyung Kim | 156e743 | 2010-11-25 01:53:13 +0900 | [diff] [blame] | 2241 | if (ext3_journal_dirty_metadata(handle, bh)) |
| 2242 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2243 | } |
| 2244 | ext3_mark_inode_dirty(handle, inode); |
Jan Kara | 00171d3 | 2009-08-11 19:06:10 +0200 | [diff] [blame] | 2245 | truncate_restart_transaction(handle, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2246 | if (bh) { |
| 2247 | BUFFER_TRACE(bh, "retaking write access"); |
Namhyung Kim | 156e743 | 2010-11-25 01:53:13 +0900 | [diff] [blame] | 2248 | if (ext3_journal_get_write_access(handle, bh)) |
| 2249 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2250 | } |
| 2251 | } |
| 2252 | |
| 2253 | /* |
| 2254 | * Any buffers which are on the journal will be in memory. We find |
| 2255 | * them on the hash table so journal_revoke() will run journal_forget() |
| 2256 | * on them. We've already detached each block from the file, so |
| 2257 | * bforget() in journal_forget() should be safe. |
| 2258 | * |
| 2259 | * AKPM: turn on bforget in journal_forget()!!! |
| 2260 | */ |
| 2261 | for (p = first; p < last; p++) { |
| 2262 | u32 nr = le32_to_cpu(*p); |
| 2263 | if (nr) { |
| 2264 | struct buffer_head *bh; |
| 2265 | |
| 2266 | *p = 0; |
| 2267 | bh = sb_find_get_block(inode->i_sb, nr); |
| 2268 | ext3_forget(handle, 0, inode, bh, nr); |
| 2269 | } |
| 2270 | } |
| 2271 | |
| 2272 | ext3_free_blocks(handle, inode, block_to_free, count); |
| 2273 | } |
| 2274 | |
| 2275 | /** |
| 2276 | * ext3_free_data - free a list of data blocks |
| 2277 | * @handle: handle for this transaction |
| 2278 | * @inode: inode we are dealing with |
| 2279 | * @this_bh: indirect buffer_head which contains *@first and *@last |
| 2280 | * @first: array of block numbers |
| 2281 | * @last: points immediately past the end of array |
| 2282 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2283 | * We are freeing all blocks referred from that array (numbers are stored as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2284 | * little-endian 32-bit) and updating @inode->i_blocks appropriately. |
| 2285 | * |
| 2286 | * We accumulate contiguous runs of blocks to free. Conveniently, if these |
| 2287 | * blocks are contiguous then releasing them at one time will only affect one |
| 2288 | * or two bitmap blocks (+ group descriptor(s) and superblock) and we won't |
| 2289 | * actually use a lot of journal space. |
| 2290 | * |
| 2291 | * @this_bh will be %NULL if @first and @last point into the inode's direct |
| 2292 | * block pointers. |
| 2293 | */ |
| 2294 | static void ext3_free_data(handle_t *handle, struct inode *inode, |
| 2295 | struct buffer_head *this_bh, |
| 2296 | __le32 *first, __le32 *last) |
| 2297 | { |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2298 | ext3_fsblk_t block_to_free = 0; /* Starting block # of a run */ |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 2299 | unsigned long count = 0; /* Number of blocks in the run */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2300 | __le32 *block_to_free_p = NULL; /* Pointer into inode/ind |
| 2301 | corresponding to |
| 2302 | block_to_free */ |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2303 | ext3_fsblk_t nr; /* Current block # */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2304 | __le32 *p; /* Pointer into inode/ind |
| 2305 | for current block */ |
| 2306 | int err; |
| 2307 | |
| 2308 | if (this_bh) { /* For indirect block */ |
| 2309 | BUFFER_TRACE(this_bh, "get_write_access"); |
| 2310 | err = ext3_journal_get_write_access(handle, this_bh); |
| 2311 | /* Important: if we can't update the indirect pointers |
| 2312 | * to the blocks, we can't free them. */ |
| 2313 | if (err) |
| 2314 | return; |
| 2315 | } |
| 2316 | |
| 2317 | for (p = first; p < last; p++) { |
| 2318 | nr = le32_to_cpu(*p); |
| 2319 | if (nr) { |
| 2320 | /* accumulate blocks to free if they're contiguous */ |
| 2321 | if (count == 0) { |
| 2322 | block_to_free = nr; |
| 2323 | block_to_free_p = p; |
| 2324 | count = 1; |
| 2325 | } else if (nr == block_to_free + count) { |
| 2326 | count++; |
| 2327 | } else { |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 2328 | ext3_clear_blocks(handle, inode, this_bh, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2329 | block_to_free, |
| 2330 | count, block_to_free_p, p); |
| 2331 | block_to_free = nr; |
| 2332 | block_to_free_p = p; |
| 2333 | count = 1; |
| 2334 | } |
| 2335 | } |
| 2336 | } |
| 2337 | |
| 2338 | if (count > 0) |
| 2339 | ext3_clear_blocks(handle, inode, this_bh, block_to_free, |
| 2340 | count, block_to_free_p, p); |
| 2341 | |
| 2342 | if (this_bh) { |
| 2343 | BUFFER_TRACE(this_bh, "call ext3_journal_dirty_metadata"); |
Duane Griffin | 3ccc316 | 2008-07-25 01:46:26 -0700 | [diff] [blame] | 2344 | |
| 2345 | /* |
| 2346 | * The buffer head should have an attached journal head at this |
| 2347 | * point. However, if the data is corrupted and an indirect |
| 2348 | * block pointed to itself, it would have been detached when |
| 2349 | * the block was cleared. Check for this instead of OOPSing. |
| 2350 | */ |
| 2351 | if (bh2jh(this_bh)) |
| 2352 | ext3_journal_dirty_metadata(handle, this_bh); |
| 2353 | else |
| 2354 | ext3_error(inode->i_sb, "ext3_free_data", |
| 2355 | "circular indirect block detected, " |
| 2356 | "inode=%lu, block=%llu", |
| 2357 | inode->i_ino, |
| 2358 | (unsigned long long)this_bh->b_blocknr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2359 | } |
| 2360 | } |
| 2361 | |
| 2362 | /** |
| 2363 | * ext3_free_branches - free an array of branches |
| 2364 | * @handle: JBD handle for this transaction |
| 2365 | * @inode: inode we are dealing with |
| 2366 | * @parent_bh: the buffer_head which contains *@first and *@last |
| 2367 | * @first: array of block numbers |
| 2368 | * @last: pointer immediately past the end of array |
| 2369 | * @depth: depth of the branches to free |
| 2370 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2371 | * We are freeing all blocks referred from these branches (numbers are |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2372 | * stored as little-endian 32-bit) and updating @inode->i_blocks |
| 2373 | * appropriately. |
| 2374 | */ |
| 2375 | static void ext3_free_branches(handle_t *handle, struct inode *inode, |
| 2376 | struct buffer_head *parent_bh, |
| 2377 | __le32 *first, __le32 *last, int depth) |
| 2378 | { |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2379 | ext3_fsblk_t nr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2380 | __le32 *p; |
| 2381 | |
| 2382 | if (is_handle_aborted(handle)) |
| 2383 | return; |
| 2384 | |
| 2385 | if (depth--) { |
| 2386 | struct buffer_head *bh; |
| 2387 | int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb); |
| 2388 | p = last; |
| 2389 | while (--p >= first) { |
| 2390 | nr = le32_to_cpu(*p); |
| 2391 | if (!nr) |
| 2392 | continue; /* A hole */ |
| 2393 | |
| 2394 | /* Go read the buffer for the next level down */ |
| 2395 | bh = sb_bread(inode->i_sb, nr); |
| 2396 | |
| 2397 | /* |
| 2398 | * A read failure? Report error and clear slot |
| 2399 | * (should be rare). |
| 2400 | */ |
| 2401 | if (!bh) { |
| 2402 | ext3_error(inode->i_sb, "ext3_free_branches", |
Eric Sandeen | eee194e | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 2403 | "Read failure, inode=%lu, block="E3FSBLK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2404 | inode->i_ino, nr); |
| 2405 | continue; |
| 2406 | } |
| 2407 | |
| 2408 | /* This zaps the entire block. Bottom up. */ |
| 2409 | BUFFER_TRACE(bh, "free child branches"); |
| 2410 | ext3_free_branches(handle, inode, bh, |
| 2411 | (__le32*)bh->b_data, |
| 2412 | (__le32*)bh->b_data + addr_per_block, |
| 2413 | depth); |
| 2414 | |
| 2415 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2416 | * Everything below this this pointer has been |
| 2417 | * released. Now let this top-of-subtree go. |
| 2418 | * |
| 2419 | * We want the freeing of this indirect block to be |
| 2420 | * atomic in the journal with the updating of the |
| 2421 | * bitmap block which owns it. So make some room in |
| 2422 | * the journal. |
| 2423 | * |
| 2424 | * We zero the parent pointer *after* freeing its |
| 2425 | * pointee in the bitmaps, so if extend_transaction() |
| 2426 | * for some reason fails to put the bitmap changes and |
| 2427 | * the release into the same transaction, recovery |
| 2428 | * will merely complain about releasing a free block, |
| 2429 | * rather than leaking blocks. |
| 2430 | */ |
| 2431 | if (is_handle_aborted(handle)) |
| 2432 | return; |
| 2433 | if (try_to_extend_transaction(handle, inode)) { |
| 2434 | ext3_mark_inode_dirty(handle, inode); |
Jan Kara | 00171d3 | 2009-08-11 19:06:10 +0200 | [diff] [blame] | 2435 | truncate_restart_transaction(handle, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2436 | } |
| 2437 | |
Jan Kara | f25f624 | 2010-07-12 21:04:31 +0200 | [diff] [blame] | 2438 | /* |
| 2439 | * We've probably journalled the indirect block several |
| 2440 | * times during the truncate. But it's no longer |
| 2441 | * needed and we now drop it from the transaction via |
| 2442 | * journal_revoke(). |
| 2443 | * |
| 2444 | * That's easy if it's exclusively part of this |
| 2445 | * transaction. But if it's part of the committing |
| 2446 | * transaction then journal_forget() will simply |
| 2447 | * brelse() it. That means that if the underlying |
| 2448 | * block is reallocated in ext3_get_block(), |
| 2449 | * unmap_underlying_metadata() will find this block |
| 2450 | * and will try to get rid of it. damn, damn. Thus |
| 2451 | * we don't allow a block to be reallocated until |
| 2452 | * a transaction freeing it has fully committed. |
| 2453 | * |
| 2454 | * We also have to make sure journal replay after a |
| 2455 | * crash does not overwrite non-journaled data blocks |
| 2456 | * with old metadata when the block got reallocated for |
| 2457 | * data. Thus we have to store a revoke record for a |
| 2458 | * block in the same transaction in which we free the |
| 2459 | * block. |
| 2460 | */ |
| 2461 | ext3_forget(handle, 1, inode, bh, bh->b_blocknr); |
| 2462 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2463 | ext3_free_blocks(handle, inode, nr, 1); |
| 2464 | |
| 2465 | if (parent_bh) { |
| 2466 | /* |
| 2467 | * The block which we have just freed is |
| 2468 | * pointed to by an indirect block: journal it |
| 2469 | */ |
| 2470 | BUFFER_TRACE(parent_bh, "get_write_access"); |
| 2471 | if (!ext3_journal_get_write_access(handle, |
| 2472 | parent_bh)){ |
| 2473 | *p = 0; |
| 2474 | BUFFER_TRACE(parent_bh, |
| 2475 | "call ext3_journal_dirty_metadata"); |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 2476 | ext3_journal_dirty_metadata(handle, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2477 | parent_bh); |
| 2478 | } |
| 2479 | } |
| 2480 | } |
| 2481 | } else { |
| 2482 | /* We have reached the bottom of the tree. */ |
| 2483 | BUFFER_TRACE(parent_bh, "free data blocks"); |
| 2484 | ext3_free_data(handle, inode, parent_bh, first, last); |
| 2485 | } |
| 2486 | } |
| 2487 | |
Duane Griffin | ae76dd9 | 2008-07-25 01:46:23 -0700 | [diff] [blame] | 2488 | int ext3_can_truncate(struct inode *inode) |
| 2489 | { |
Duane Griffin | ae76dd9 | 2008-07-25 01:46:23 -0700 | [diff] [blame] | 2490 | if (S_ISREG(inode->i_mode)) |
| 2491 | return 1; |
| 2492 | if (S_ISDIR(inode->i_mode)) |
| 2493 | return 1; |
| 2494 | if (S_ISLNK(inode->i_mode)) |
| 2495 | return !ext3_inode_is_fast_symlink(inode); |
| 2496 | return 0; |
| 2497 | } |
| 2498 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2499 | /* |
| 2500 | * ext3_truncate() |
| 2501 | * |
| 2502 | * We block out ext3_get_block() block instantiations across the entire |
| 2503 | * transaction, and VFS/VM ensures that ext3_truncate() cannot run |
| 2504 | * simultaneously on behalf of the same inode. |
| 2505 | * |
Justin P. Mattock | 42b2aa8 | 2011-11-28 20:31:00 -0800 | [diff] [blame] | 2506 | * As we work through the truncate and commit bits of it to the journal there |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2507 | * is one core, guiding principle: the file's tree must always be consistent on |
| 2508 | * disk. We must be able to restart the truncate after a crash. |
| 2509 | * |
| 2510 | * The file's tree may be transiently inconsistent in memory (although it |
| 2511 | * probably isn't), but whenever we close off and commit a journal transaction, |
| 2512 | * the contents of (the filesystem + the journal) must be consistent and |
| 2513 | * restartable. It's pretty simple, really: bottom up, right to left (although |
| 2514 | * left-to-right works OK too). |
| 2515 | * |
| 2516 | * Note that at recovery time, journal replay occurs *before* the restart of |
| 2517 | * truncate against the orphan inode list. |
| 2518 | * |
| 2519 | * The committed inode has the new, desired i_size (which is the same as |
| 2520 | * i_disksize in this case). After a crash, ext3_orphan_cleanup() will see |
| 2521 | * that this inode's truncate did not complete and it will again call |
| 2522 | * ext3_truncate() to have another go. So there will be instantiated blocks |
| 2523 | * to the right of the truncation point in a crashed ext3 filesystem. But |
| 2524 | * that's fine - as long as they are linked from the inode, the post-crash |
| 2525 | * ext3_truncate() run will find them and release them. |
| 2526 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2527 | void ext3_truncate(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2528 | { |
| 2529 | handle_t *handle; |
| 2530 | struct ext3_inode_info *ei = EXT3_I(inode); |
| 2531 | __le32 *i_data = ei->i_data; |
| 2532 | int addr_per_block = EXT3_ADDR_PER_BLOCK(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2533 | int offsets[4]; |
| 2534 | Indirect chain[4]; |
| 2535 | Indirect *partial; |
| 2536 | __le32 nr = 0; |
| 2537 | int n; |
| 2538 | long last_block; |
| 2539 | unsigned blocksize = inode->i_sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2540 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 2541 | trace_ext3_truncate_enter(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2542 | |
Duane Griffin | ae76dd9 | 2008-07-25 01:46:23 -0700 | [diff] [blame] | 2543 | if (!ext3_can_truncate(inode)) |
Jan Kara | ef43618 | 2009-06-17 16:26:24 -0700 | [diff] [blame] | 2544 | goto out_notrans; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2545 | |
Theodore Ts'o | f7ab34e | 2009-04-03 01:34:35 -0400 | [diff] [blame] | 2546 | if (inode->i_size == 0 && ext3_should_writeback_data(inode)) |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 2547 | ext3_set_inode_state(inode, EXT3_STATE_FLUSH_ON_CLOSE); |
Theodore Ts'o | f7ab34e | 2009-04-03 01:34:35 -0400 | [diff] [blame] | 2548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2549 | handle = start_transaction(inode); |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 2550 | if (IS_ERR(handle)) |
Jan Kara | ef43618 | 2009-06-17 16:26:24 -0700 | [diff] [blame] | 2551 | goto out_notrans; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2552 | |
| 2553 | last_block = (inode->i_size + blocksize-1) |
| 2554 | >> EXT3_BLOCK_SIZE_BITS(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2555 | n = ext3_block_to_path(inode, last_block, offsets, NULL); |
| 2556 | if (n == 0) |
| 2557 | goto out_stop; /* error */ |
| 2558 | |
| 2559 | /* |
| 2560 | * OK. This truncate is going to happen. We add the inode to the |
| 2561 | * orphan list, so that if this truncate spans multiple transactions, |
| 2562 | * and we crash, we will resume the truncate when the filesystem |
| 2563 | * recovers. It also marks the inode dirty, to catch the new size. |
| 2564 | * |
| 2565 | * Implication: the file must always be in a sane, consistent |
| 2566 | * truncatable state while each transaction commits. |
| 2567 | */ |
| 2568 | if (ext3_orphan_add(handle, inode)) |
| 2569 | goto out_stop; |
| 2570 | |
| 2571 | /* |
| 2572 | * The orphan list entry will now protect us from any crash which |
| 2573 | * occurs before the truncate completes, so it is now safe to propagate |
| 2574 | * the new, shorter inode size (held for now in i_size) into the |
| 2575 | * on-disk inode. We do this via i_disksize, which is the value which |
| 2576 | * ext3 *really* writes onto the disk inode. |
| 2577 | */ |
| 2578 | ei->i_disksize = inode->i_size; |
| 2579 | |
| 2580 | /* |
| 2581 | * From here we block out all ext3_get_block() callers who want to |
| 2582 | * modify the block allocation tree. |
| 2583 | */ |
Arjan van de Ven | 9746151 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 2584 | mutex_lock(&ei->truncate_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2585 | |
| 2586 | if (n == 1) { /* direct blocks */ |
| 2587 | ext3_free_data(handle, inode, NULL, i_data+offsets[0], |
| 2588 | i_data + EXT3_NDIR_BLOCKS); |
| 2589 | goto do_indirects; |
| 2590 | } |
| 2591 | |
| 2592 | partial = ext3_find_shared(inode, n, offsets, chain, &nr); |
| 2593 | /* Kill the top of shared branch (not detached) */ |
| 2594 | if (nr) { |
| 2595 | if (partial == chain) { |
| 2596 | /* Shared branch grows from the inode */ |
| 2597 | ext3_free_branches(handle, inode, NULL, |
| 2598 | &nr, &nr+1, (chain+n-1) - partial); |
| 2599 | *partial->p = 0; |
| 2600 | /* |
| 2601 | * We mark the inode dirty prior to restart, |
| 2602 | * and prior to stop. No need for it here. |
| 2603 | */ |
| 2604 | } else { |
| 2605 | /* Shared branch grows from an indirect block */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2606 | ext3_free_branches(handle, inode, partial->bh, |
| 2607 | partial->p, |
| 2608 | partial->p+1, (chain+n-1) - partial); |
| 2609 | } |
| 2610 | } |
| 2611 | /* Clear the ends of indirect blocks on the shared branch */ |
| 2612 | while (partial > chain) { |
| 2613 | ext3_free_branches(handle, inode, partial->bh, partial->p + 1, |
| 2614 | (__le32*)partial->bh->b_data+addr_per_block, |
| 2615 | (chain+n-1) - partial); |
| 2616 | BUFFER_TRACE(partial->bh, "call brelse"); |
| 2617 | brelse (partial->bh); |
| 2618 | partial--; |
| 2619 | } |
| 2620 | do_indirects: |
| 2621 | /* Kill the remaining (whole) subtrees */ |
| 2622 | switch (offsets[0]) { |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2623 | default: |
| 2624 | nr = i_data[EXT3_IND_BLOCK]; |
| 2625 | if (nr) { |
| 2626 | ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 1); |
| 2627 | i_data[EXT3_IND_BLOCK] = 0; |
| 2628 | } |
| 2629 | case EXT3_IND_BLOCK: |
| 2630 | nr = i_data[EXT3_DIND_BLOCK]; |
| 2631 | if (nr) { |
| 2632 | ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 2); |
| 2633 | i_data[EXT3_DIND_BLOCK] = 0; |
| 2634 | } |
| 2635 | case EXT3_DIND_BLOCK: |
| 2636 | nr = i_data[EXT3_TIND_BLOCK]; |
| 2637 | if (nr) { |
| 2638 | ext3_free_branches(handle, inode, NULL, &nr, &nr+1, 3); |
| 2639 | i_data[EXT3_TIND_BLOCK] = 0; |
| 2640 | } |
| 2641 | case EXT3_TIND_BLOCK: |
| 2642 | ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2643 | } |
| 2644 | |
| 2645 | ext3_discard_reservation(inode); |
| 2646 | |
Arjan van de Ven | 9746151 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 2647 | mutex_unlock(&ei->truncate_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2648 | inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC; |
| 2649 | ext3_mark_inode_dirty(handle, inode); |
| 2650 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 2651 | /* |
| 2652 | * In a multi-transaction truncate, we only make the final transaction |
| 2653 | * synchronous |
| 2654 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2655 | if (IS_SYNC(inode)) |
| 2656 | handle->h_sync = 1; |
| 2657 | out_stop: |
| 2658 | /* |
| 2659 | * If this was a simple ftruncate(), and the file will remain alive |
| 2660 | * then we need to clear up the orphan record which we created above. |
| 2661 | * However, if this was a real unlink then we were called by |
Al Viro | ac14a95 | 2010-06-06 07:08:19 -0400 | [diff] [blame] | 2662 | * ext3_evict_inode(), and we allow that function to clean up the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2663 | * orphan info for us. |
| 2664 | */ |
| 2665 | if (inode->i_nlink) |
| 2666 | ext3_orphan_del(handle, inode); |
| 2667 | |
| 2668 | ext3_journal_stop(handle); |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 2669 | trace_ext3_truncate_exit(inode); |
Jan Kara | ef43618 | 2009-06-17 16:26:24 -0700 | [diff] [blame] | 2670 | return; |
| 2671 | out_notrans: |
| 2672 | /* |
| 2673 | * Delete the inode from orphan list so that it doesn't stay there |
| 2674 | * forever and trigger assertion on umount. |
| 2675 | */ |
| 2676 | if (inode->i_nlink) |
| 2677 | ext3_orphan_del(NULL, inode); |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 2678 | trace_ext3_truncate_exit(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2679 | } |
| 2680 | |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2681 | static ext3_fsblk_t ext3_get_inode_block(struct super_block *sb, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2682 | unsigned long ino, struct ext3_iloc *iloc) |
| 2683 | { |
Akinobu Mita | e0e369a | 2008-04-28 02:16:08 -0700 | [diff] [blame] | 2684 | unsigned long block_group; |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2685 | unsigned long offset; |
| 2686 | ext3_fsblk_t block; |
Akinobu Mita | e0e369a | 2008-04-28 02:16:08 -0700 | [diff] [blame] | 2687 | struct ext3_group_desc *gdp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2688 | |
Neil Brown | 2ccb48e | 2006-07-30 03:03:01 -0700 | [diff] [blame] | 2689 | if (!ext3_valid_inum(sb, ino)) { |
| 2690 | /* |
| 2691 | * This error is already checked for in namei.c unless we are |
| 2692 | * looking at an NFS filehandle, in which case no error |
| 2693 | * report is needed |
| 2694 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2695 | return 0; |
| 2696 | } |
Neil Brown | 2ccb48e | 2006-07-30 03:03:01 -0700 | [diff] [blame] | 2697 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2698 | block_group = (ino - 1) / EXT3_INODES_PER_GROUP(sb); |
Akinobu Mita | e0e369a | 2008-04-28 02:16:08 -0700 | [diff] [blame] | 2699 | gdp = ext3_get_group_desc(sb, block_group, NULL); |
| 2700 | if (!gdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2701 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2702 | /* |
| 2703 | * Figure out the offset within the block group inode table |
| 2704 | */ |
| 2705 | offset = ((ino - 1) % EXT3_INODES_PER_GROUP(sb)) * |
| 2706 | EXT3_INODE_SIZE(sb); |
Akinobu Mita | e0e369a | 2008-04-28 02:16:08 -0700 | [diff] [blame] | 2707 | block = le32_to_cpu(gdp->bg_inode_table) + |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2708 | (offset >> EXT3_BLOCK_SIZE_BITS(sb)); |
| 2709 | |
| 2710 | iloc->block_group = block_group; |
| 2711 | iloc->offset = offset & (EXT3_BLOCK_SIZE(sb) - 1); |
| 2712 | return block; |
| 2713 | } |
| 2714 | |
| 2715 | /* |
| 2716 | * ext3_get_inode_loc returns with an extra refcount against the inode's |
| 2717 | * underlying buffer_head on success. If 'in_mem' is true, we have all |
| 2718 | * data in memory that is needed to recreate the on-disk version of this |
| 2719 | * inode. |
| 2720 | */ |
| 2721 | static int __ext3_get_inode_loc(struct inode *inode, |
| 2722 | struct ext3_iloc *iloc, int in_mem) |
| 2723 | { |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2724 | ext3_fsblk_t block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2725 | struct buffer_head *bh; |
| 2726 | |
| 2727 | block = ext3_get_inode_block(inode->i_sb, inode->i_ino, iloc); |
| 2728 | if (!block) |
| 2729 | return -EIO; |
| 2730 | |
| 2731 | bh = sb_getblk(inode->i_sb, block); |
| 2732 | if (!bh) { |
| 2733 | ext3_error (inode->i_sb, "ext3_get_inode_loc", |
| 2734 | "unable to read inode block - " |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2735 | "inode=%lu, block="E3FSBLK, |
| 2736 | inode->i_ino, block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2737 | return -EIO; |
| 2738 | } |
| 2739 | if (!buffer_uptodate(bh)) { |
| 2740 | lock_buffer(bh); |
Hidehiro Kawai | 95450f5 | 2008-07-25 01:46:24 -0700 | [diff] [blame] | 2741 | |
| 2742 | /* |
| 2743 | * If the buffer has the write error flag, we have failed |
| 2744 | * to write out another inode in the same block. In this |
| 2745 | * case, we don't have to read the block because we may |
| 2746 | * read the old inode data successfully. |
| 2747 | */ |
| 2748 | if (buffer_write_io_error(bh) && !buffer_uptodate(bh)) |
| 2749 | set_buffer_uptodate(bh); |
| 2750 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2751 | if (buffer_uptodate(bh)) { |
| 2752 | /* someone brought it uptodate while we waited */ |
| 2753 | unlock_buffer(bh); |
| 2754 | goto has_buffer; |
| 2755 | } |
| 2756 | |
| 2757 | /* |
| 2758 | * If we have all information of the inode in memory and this |
| 2759 | * is the only valid inode in the block, we need not read the |
| 2760 | * block. |
| 2761 | */ |
| 2762 | if (in_mem) { |
| 2763 | struct buffer_head *bitmap_bh; |
| 2764 | struct ext3_group_desc *desc; |
| 2765 | int inodes_per_buffer; |
| 2766 | int inode_offset, i; |
| 2767 | int block_group; |
| 2768 | int start; |
| 2769 | |
| 2770 | block_group = (inode->i_ino - 1) / |
| 2771 | EXT3_INODES_PER_GROUP(inode->i_sb); |
| 2772 | inodes_per_buffer = bh->b_size / |
| 2773 | EXT3_INODE_SIZE(inode->i_sb); |
| 2774 | inode_offset = ((inode->i_ino - 1) % |
| 2775 | EXT3_INODES_PER_GROUP(inode->i_sb)); |
| 2776 | start = inode_offset & ~(inodes_per_buffer - 1); |
| 2777 | |
| 2778 | /* Is the inode bitmap in cache? */ |
| 2779 | desc = ext3_get_group_desc(inode->i_sb, |
| 2780 | block_group, NULL); |
| 2781 | if (!desc) |
| 2782 | goto make_io; |
| 2783 | |
| 2784 | bitmap_bh = sb_getblk(inode->i_sb, |
| 2785 | le32_to_cpu(desc->bg_inode_bitmap)); |
| 2786 | if (!bitmap_bh) |
| 2787 | goto make_io; |
| 2788 | |
| 2789 | /* |
| 2790 | * If the inode bitmap isn't in cache then the |
| 2791 | * optimisation may end up performing two reads instead |
| 2792 | * of one, so skip it. |
| 2793 | */ |
| 2794 | if (!buffer_uptodate(bitmap_bh)) { |
| 2795 | brelse(bitmap_bh); |
| 2796 | goto make_io; |
| 2797 | } |
| 2798 | for (i = start; i < start + inodes_per_buffer; i++) { |
| 2799 | if (i == inode_offset) |
| 2800 | continue; |
| 2801 | if (ext3_test_bit(i, bitmap_bh->b_data)) |
| 2802 | break; |
| 2803 | } |
| 2804 | brelse(bitmap_bh); |
| 2805 | if (i == start + inodes_per_buffer) { |
| 2806 | /* all other inodes are free, so skip I/O */ |
| 2807 | memset(bh->b_data, 0, bh->b_size); |
| 2808 | set_buffer_uptodate(bh); |
| 2809 | unlock_buffer(bh); |
| 2810 | goto has_buffer; |
| 2811 | } |
| 2812 | } |
| 2813 | |
| 2814 | make_io: |
| 2815 | /* |
| 2816 | * There are other valid inodes in the buffer, this inode |
| 2817 | * has in-inode xattrs, or we don't have this inode in memory. |
| 2818 | * Read the block from disk. |
| 2819 | */ |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 2820 | trace_ext3_load_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2821 | get_bh(bh); |
| 2822 | bh->b_end_io = end_buffer_read_sync; |
Christoph Hellwig | 65299a3 | 2011-08-23 14:50:29 +0200 | [diff] [blame] | 2823 | submit_bh(READ | REQ_META | REQ_PRIO, bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2824 | wait_on_buffer(bh); |
| 2825 | if (!buffer_uptodate(bh)) { |
| 2826 | ext3_error(inode->i_sb, "ext3_get_inode_loc", |
| 2827 | "unable to read inode block - " |
Mingming Cao | 43d23f9 | 2006-06-25 05:48:07 -0700 | [diff] [blame] | 2828 | "inode=%lu, block="E3FSBLK, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2829 | inode->i_ino, block); |
| 2830 | brelse(bh); |
| 2831 | return -EIO; |
| 2832 | } |
| 2833 | } |
| 2834 | has_buffer: |
| 2835 | iloc->bh = bh; |
| 2836 | return 0; |
| 2837 | } |
| 2838 | |
| 2839 | int ext3_get_inode_loc(struct inode *inode, struct ext3_iloc *iloc) |
| 2840 | { |
| 2841 | /* We have all inode data except xattrs in memory here. */ |
| 2842 | return __ext3_get_inode_loc(inode, iloc, |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 2843 | !ext3_test_inode_state(inode, EXT3_STATE_XATTR)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2844 | } |
| 2845 | |
| 2846 | void ext3_set_inode_flags(struct inode *inode) |
| 2847 | { |
| 2848 | unsigned int flags = EXT3_I(inode)->i_flags; |
| 2849 | |
| 2850 | inode->i_flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); |
| 2851 | if (flags & EXT3_SYNC_FL) |
| 2852 | inode->i_flags |= S_SYNC; |
| 2853 | if (flags & EXT3_APPEND_FL) |
| 2854 | inode->i_flags |= S_APPEND; |
| 2855 | if (flags & EXT3_IMMUTABLE_FL) |
| 2856 | inode->i_flags |= S_IMMUTABLE; |
| 2857 | if (flags & EXT3_NOATIME_FL) |
| 2858 | inode->i_flags |= S_NOATIME; |
| 2859 | if (flags & EXT3_DIRSYNC_FL) |
| 2860 | inode->i_flags |= S_DIRSYNC; |
| 2861 | } |
| 2862 | |
Jan Kara | 28be5ab | 2007-05-08 00:30:33 -0700 | [diff] [blame] | 2863 | /* Propagate flags from i_flags to EXT3_I(inode)->i_flags */ |
| 2864 | void ext3_get_inode_flags(struct ext3_inode_info *ei) |
| 2865 | { |
| 2866 | unsigned int flags = ei->vfs_inode.i_flags; |
| 2867 | |
| 2868 | ei->i_flags &= ~(EXT3_SYNC_FL|EXT3_APPEND_FL| |
| 2869 | EXT3_IMMUTABLE_FL|EXT3_NOATIME_FL|EXT3_DIRSYNC_FL); |
| 2870 | if (flags & S_SYNC) |
| 2871 | ei->i_flags |= EXT3_SYNC_FL; |
| 2872 | if (flags & S_APPEND) |
| 2873 | ei->i_flags |= EXT3_APPEND_FL; |
| 2874 | if (flags & S_IMMUTABLE) |
| 2875 | ei->i_flags |= EXT3_IMMUTABLE_FL; |
| 2876 | if (flags & S_NOATIME) |
| 2877 | ei->i_flags |= EXT3_NOATIME_FL; |
| 2878 | if (flags & S_DIRSYNC) |
| 2879 | ei->i_flags |= EXT3_DIRSYNC_FL; |
| 2880 | } |
| 2881 | |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2882 | struct inode *ext3_iget(struct super_block *sb, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2883 | { |
| 2884 | struct ext3_iloc iloc; |
| 2885 | struct ext3_inode *raw_inode; |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2886 | struct ext3_inode_info *ei; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2887 | struct buffer_head *bh; |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2888 | struct inode *inode; |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 2889 | journal_t *journal = EXT3_SB(sb)->s_journal; |
| 2890 | transaction_t *transaction; |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2891 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2892 | int block; |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 2893 | uid_t i_uid; |
| 2894 | gid_t i_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2895 | |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2896 | inode = iget_locked(sb, ino); |
| 2897 | if (!inode) |
| 2898 | return ERR_PTR(-ENOMEM); |
| 2899 | if (!(inode->i_state & I_NEW)) |
| 2900 | return inode; |
| 2901 | |
| 2902 | ei = EXT3_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2903 | ei->i_block_alloc_info = NULL; |
| 2904 | |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2905 | ret = __ext3_get_inode_loc(inode, &iloc, 0); |
| 2906 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2907 | goto bad_inode; |
| 2908 | bh = iloc.bh; |
| 2909 | raw_inode = ext3_raw_inode(&iloc); |
| 2910 | inode->i_mode = le16_to_cpu(raw_inode->i_mode); |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 2911 | i_uid = (uid_t)le16_to_cpu(raw_inode->i_uid_low); |
| 2912 | i_gid = (gid_t)le16_to_cpu(raw_inode->i_gid_low); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2913 | if(!(test_opt (inode->i_sb, NO_UID32))) { |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 2914 | i_uid |= le16_to_cpu(raw_inode->i_uid_high) << 16; |
| 2915 | i_gid |= le16_to_cpu(raw_inode->i_gid_high) << 16; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2916 | } |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 2917 | i_uid_write(inode, i_uid); |
| 2918 | i_gid_write(inode, i_gid); |
Miklos Szeredi | bfe8684 | 2011-10-28 14:13:29 +0200 | [diff] [blame] | 2919 | set_nlink(inode, le16_to_cpu(raw_inode->i_links_count)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2920 | inode->i_size = le32_to_cpu(raw_inode->i_size); |
Markus Rechberger | 4d7bf11 | 2007-05-08 00:23:39 -0700 | [diff] [blame] | 2921 | inode->i_atime.tv_sec = (signed)le32_to_cpu(raw_inode->i_atime); |
| 2922 | inode->i_ctime.tv_sec = (signed)le32_to_cpu(raw_inode->i_ctime); |
| 2923 | inode->i_mtime.tv_sec = (signed)le32_to_cpu(raw_inode->i_mtime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2924 | inode->i_atime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_mtime.tv_nsec = 0; |
| 2925 | |
Linus Torvalds | de32982 | 2010-03-29 14:30:19 -0700 | [diff] [blame] | 2926 | ei->i_state_flags = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2927 | ei->i_dir_start_lookup = 0; |
| 2928 | ei->i_dtime = le32_to_cpu(raw_inode->i_dtime); |
| 2929 | /* We now have enough fields to check if the inode was active or not. |
| 2930 | * This is needed because nfsd might try to access dead inodes |
| 2931 | * the test is that same one that e2fsck uses |
| 2932 | * NeilBrown 1999oct15 |
| 2933 | */ |
| 2934 | if (inode->i_nlink == 0) { |
| 2935 | if (inode->i_mode == 0 || |
| 2936 | !(EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ORPHAN_FS)) { |
| 2937 | /* this inode is deleted */ |
| 2938 | brelse (bh); |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 2939 | ret = -ESTALE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2940 | goto bad_inode; |
| 2941 | } |
| 2942 | /* The only unlinked inodes we let through here have |
| 2943 | * valid i_mode and are being read by the orphan |
| 2944 | * recovery code: that's fine, we're about to complete |
| 2945 | * the process of deleting those. */ |
| 2946 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2947 | inode->i_blocks = le32_to_cpu(raw_inode->i_blocks); |
| 2948 | ei->i_flags = le32_to_cpu(raw_inode->i_flags); |
| 2949 | #ifdef EXT3_FRAGMENTS |
| 2950 | ei->i_faddr = le32_to_cpu(raw_inode->i_faddr); |
| 2951 | ei->i_frag_no = raw_inode->i_frag; |
| 2952 | ei->i_frag_size = raw_inode->i_fsize; |
| 2953 | #endif |
| 2954 | ei->i_file_acl = le32_to_cpu(raw_inode->i_file_acl); |
| 2955 | if (!S_ISREG(inode->i_mode)) { |
| 2956 | ei->i_dir_acl = le32_to_cpu(raw_inode->i_dir_acl); |
| 2957 | } else { |
| 2958 | inode->i_size |= |
| 2959 | ((__u64)le32_to_cpu(raw_inode->i_size_high)) << 32; |
| 2960 | } |
| 2961 | ei->i_disksize = inode->i_size; |
| 2962 | inode->i_generation = le32_to_cpu(raw_inode->i_generation); |
| 2963 | ei->i_block_group = iloc.block_group; |
| 2964 | /* |
| 2965 | * NOTE! The in-memory inode i_data array is in little-endian order |
| 2966 | * even on big-endian machines: we do NOT byteswap the block numbers! |
| 2967 | */ |
| 2968 | for (block = 0; block < EXT3_N_BLOCKS; block++) |
| 2969 | ei->i_data[block] = raw_inode->i_block[block]; |
| 2970 | INIT_LIST_HEAD(&ei->i_orphan); |
| 2971 | |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 2972 | /* |
| 2973 | * Set transaction id's of transactions that have to be committed |
| 2974 | * to finish f[data]sync. We set them to currently running transaction |
| 2975 | * as we cannot be sure that the inode or some of its metadata isn't |
| 2976 | * part of the transaction - the inode could have been reclaimed and |
| 2977 | * now it is reread from disk. |
| 2978 | */ |
| 2979 | if (journal) { |
| 2980 | tid_t tid; |
| 2981 | |
| 2982 | spin_lock(&journal->j_state_lock); |
| 2983 | if (journal->j_running_transaction) |
| 2984 | transaction = journal->j_running_transaction; |
| 2985 | else |
| 2986 | transaction = journal->j_committing_transaction; |
| 2987 | if (transaction) |
| 2988 | tid = transaction->t_tid; |
| 2989 | else |
| 2990 | tid = journal->j_commit_sequence; |
| 2991 | spin_unlock(&journal->j_state_lock); |
| 2992 | atomic_set(&ei->i_sync_tid, tid); |
| 2993 | atomic_set(&ei->i_datasync_tid, tid); |
| 2994 | } |
| 2995 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2996 | if (inode->i_ino >= EXT3_FIRST_INO(inode->i_sb) + 1 && |
| 2997 | EXT3_INODE_SIZE(inode->i_sb) > EXT3_GOOD_OLD_INODE_SIZE) { |
| 2998 | /* |
| 2999 | * When mke2fs creates big inodes it does not zero out |
| 3000 | * the unused bytes above EXT3_GOOD_OLD_INODE_SIZE, |
| 3001 | * so ignore those first few inodes. |
| 3002 | */ |
| 3003 | ei->i_extra_isize = le16_to_cpu(raw_inode->i_extra_isize); |
| 3004 | if (EXT3_GOOD_OLD_INODE_SIZE + ei->i_extra_isize > |
Kirill Korotaev | e4a10a3 | 2007-06-23 17:16:48 -0700 | [diff] [blame] | 3005 | EXT3_INODE_SIZE(inode->i_sb)) { |
| 3006 | brelse (bh); |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 3007 | ret = -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3008 | goto bad_inode; |
Kirill Korotaev | e4a10a3 | 2007-06-23 17:16:48 -0700 | [diff] [blame] | 3009 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3010 | if (ei->i_extra_isize == 0) { |
| 3011 | /* The extra space is currently unused. Use it. */ |
| 3012 | ei->i_extra_isize = sizeof(struct ext3_inode) - |
| 3013 | EXT3_GOOD_OLD_INODE_SIZE; |
| 3014 | } else { |
| 3015 | __le32 *magic = (void *)raw_inode + |
| 3016 | EXT3_GOOD_OLD_INODE_SIZE + |
| 3017 | ei->i_extra_isize; |
| 3018 | if (*magic == cpu_to_le32(EXT3_XATTR_MAGIC)) |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 3019 | ext3_set_inode_state(inode, EXT3_STATE_XATTR); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3020 | } |
| 3021 | } else |
| 3022 | ei->i_extra_isize = 0; |
| 3023 | |
| 3024 | if (S_ISREG(inode->i_mode)) { |
| 3025 | inode->i_op = &ext3_file_inode_operations; |
| 3026 | inode->i_fop = &ext3_file_operations; |
| 3027 | ext3_set_aops(inode); |
| 3028 | } else if (S_ISDIR(inode->i_mode)) { |
| 3029 | inode->i_op = &ext3_dir_inode_operations; |
| 3030 | inode->i_fop = &ext3_dir_operations; |
| 3031 | } else if (S_ISLNK(inode->i_mode)) { |
Duane Griffin | b5ed311 | 2008-12-19 20:47:14 +0000 | [diff] [blame] | 3032 | if (ext3_inode_is_fast_symlink(inode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3033 | inode->i_op = &ext3_fast_symlink_inode_operations; |
Duane Griffin | b5ed311 | 2008-12-19 20:47:14 +0000 | [diff] [blame] | 3034 | nd_terminate_link(ei->i_data, inode->i_size, |
| 3035 | sizeof(ei->i_data) - 1); |
| 3036 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3037 | inode->i_op = &ext3_symlink_inode_operations; |
| 3038 | ext3_set_aops(inode); |
| 3039 | } |
| 3040 | } else { |
| 3041 | inode->i_op = &ext3_special_inode_operations; |
| 3042 | if (raw_inode->i_block[0]) |
| 3043 | init_special_inode(inode, inode->i_mode, |
| 3044 | old_decode_dev(le32_to_cpu(raw_inode->i_block[0]))); |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3045 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3046 | init_special_inode(inode, inode->i_mode, |
| 3047 | new_decode_dev(le32_to_cpu(raw_inode->i_block[1]))); |
| 3048 | } |
| 3049 | brelse (iloc.bh); |
| 3050 | ext3_set_inode_flags(inode); |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 3051 | unlock_new_inode(inode); |
| 3052 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3053 | |
| 3054 | bad_inode: |
David Howells | 473043d | 2008-02-07 00:15:36 -0800 | [diff] [blame] | 3055 | iget_failed(inode); |
| 3056 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3057 | } |
| 3058 | |
| 3059 | /* |
| 3060 | * Post the struct inode info into an on-disk inode location in the |
| 3061 | * buffer-cache. This gobbles the caller's reference to the |
| 3062 | * buffer_head in the inode location struct. |
| 3063 | * |
| 3064 | * The caller must have write access to iloc->bh. |
| 3065 | */ |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3066 | static int ext3_do_update_inode(handle_t *handle, |
| 3067 | struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3068 | struct ext3_iloc *iloc) |
| 3069 | { |
| 3070 | struct ext3_inode *raw_inode = ext3_raw_inode(iloc); |
| 3071 | struct ext3_inode_info *ei = EXT3_I(inode); |
| 3072 | struct buffer_head *bh = iloc->bh; |
| 3073 | int err = 0, rc, block; |
Jan Kara | 156bddd | 2012-09-03 16:50:42 +0200 | [diff] [blame] | 3074 | int need_datasync = 0; |
| 3075 | __le32 disksize; |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3076 | uid_t i_uid; |
| 3077 | gid_t i_gid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3078 | |
Chris Mason | 4f003fd | 2009-09-08 00:22:14 +0200 | [diff] [blame] | 3079 | again: |
| 3080 | /* we can't allow multiple procs in here at once, its a bit racey */ |
| 3081 | lock_buffer(bh); |
| 3082 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3083 | /* For fields not not tracking in the in-memory inode, |
| 3084 | * initialise them to zero for new inodes. */ |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 3085 | if (ext3_test_inode_state(inode, EXT3_STATE_NEW)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3086 | memset(raw_inode, 0, EXT3_SB(inode->i_sb)->s_inode_size); |
| 3087 | |
Jan Kara | 28be5ab | 2007-05-08 00:30:33 -0700 | [diff] [blame] | 3088 | ext3_get_inode_flags(ei); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3089 | raw_inode->i_mode = cpu_to_le16(inode->i_mode); |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3090 | i_uid = i_uid_read(inode); |
| 3091 | i_gid = i_gid_read(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3092 | if(!(test_opt(inode->i_sb, NO_UID32))) { |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3093 | raw_inode->i_uid_low = cpu_to_le16(low_16_bits(i_uid)); |
| 3094 | raw_inode->i_gid_low = cpu_to_le16(low_16_bits(i_gid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3095 | /* |
| 3096 | * Fix up interoperability with old kernels. Otherwise, old inodes get |
| 3097 | * re-used with the upper 16 bits of the uid/gid intact |
| 3098 | */ |
| 3099 | if(!ei->i_dtime) { |
| 3100 | raw_inode->i_uid_high = |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3101 | cpu_to_le16(high_16_bits(i_uid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3102 | raw_inode->i_gid_high = |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3103 | cpu_to_le16(high_16_bits(i_gid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3104 | } else { |
| 3105 | raw_inode->i_uid_high = 0; |
| 3106 | raw_inode->i_gid_high = 0; |
| 3107 | } |
| 3108 | } else { |
| 3109 | raw_inode->i_uid_low = |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3110 | cpu_to_le16(fs_high2lowuid(i_uid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3111 | raw_inode->i_gid_low = |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3112 | cpu_to_le16(fs_high2lowgid(i_gid)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3113 | raw_inode->i_uid_high = 0; |
| 3114 | raw_inode->i_gid_high = 0; |
| 3115 | } |
| 3116 | raw_inode->i_links_count = cpu_to_le16(inode->i_nlink); |
Jan Kara | 156bddd | 2012-09-03 16:50:42 +0200 | [diff] [blame] | 3117 | disksize = cpu_to_le32(ei->i_disksize); |
| 3118 | if (disksize != raw_inode->i_size) { |
| 3119 | need_datasync = 1; |
| 3120 | raw_inode->i_size = disksize; |
| 3121 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3122 | raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec); |
| 3123 | raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec); |
| 3124 | raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec); |
| 3125 | raw_inode->i_blocks = cpu_to_le32(inode->i_blocks); |
| 3126 | raw_inode->i_dtime = cpu_to_le32(ei->i_dtime); |
| 3127 | raw_inode->i_flags = cpu_to_le32(ei->i_flags); |
| 3128 | #ifdef EXT3_FRAGMENTS |
| 3129 | raw_inode->i_faddr = cpu_to_le32(ei->i_faddr); |
| 3130 | raw_inode->i_frag = ei->i_frag_no; |
| 3131 | raw_inode->i_fsize = ei->i_frag_size; |
| 3132 | #endif |
| 3133 | raw_inode->i_file_acl = cpu_to_le32(ei->i_file_acl); |
| 3134 | if (!S_ISREG(inode->i_mode)) { |
| 3135 | raw_inode->i_dir_acl = cpu_to_le32(ei->i_dir_acl); |
| 3136 | } else { |
Jan Kara | 156bddd | 2012-09-03 16:50:42 +0200 | [diff] [blame] | 3137 | disksize = cpu_to_le32(ei->i_disksize >> 32); |
| 3138 | if (disksize != raw_inode->i_size_high) { |
| 3139 | raw_inode->i_size_high = disksize; |
| 3140 | need_datasync = 1; |
| 3141 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3142 | if (ei->i_disksize > 0x7fffffffULL) { |
| 3143 | struct super_block *sb = inode->i_sb; |
| 3144 | if (!EXT3_HAS_RO_COMPAT_FEATURE(sb, |
| 3145 | EXT3_FEATURE_RO_COMPAT_LARGE_FILE) || |
| 3146 | EXT3_SB(sb)->s_es->s_rev_level == |
| 3147 | cpu_to_le32(EXT3_GOOD_OLD_REV)) { |
| 3148 | /* If this is the first large file |
| 3149 | * created, add a flag to the superblock. |
| 3150 | */ |
Chris Mason | 4f003fd | 2009-09-08 00:22:14 +0200 | [diff] [blame] | 3151 | unlock_buffer(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3152 | err = ext3_journal_get_write_access(handle, |
| 3153 | EXT3_SB(sb)->s_sbh); |
| 3154 | if (err) |
| 3155 | goto out_brelse; |
Chris Mason | 4f003fd | 2009-09-08 00:22:14 +0200 | [diff] [blame] | 3156 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3157 | ext3_update_dynamic_rev(sb); |
| 3158 | EXT3_SET_RO_COMPAT_FEATURE(sb, |
| 3159 | EXT3_FEATURE_RO_COMPAT_LARGE_FILE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3160 | handle->h_sync = 1; |
| 3161 | err = ext3_journal_dirty_metadata(handle, |
| 3162 | EXT3_SB(sb)->s_sbh); |
Chris Mason | 4f003fd | 2009-09-08 00:22:14 +0200 | [diff] [blame] | 3163 | /* get our lock and start over */ |
| 3164 | goto again; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3165 | } |
| 3166 | } |
| 3167 | } |
| 3168 | raw_inode->i_generation = cpu_to_le32(inode->i_generation); |
| 3169 | if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) { |
| 3170 | if (old_valid_dev(inode->i_rdev)) { |
| 3171 | raw_inode->i_block[0] = |
| 3172 | cpu_to_le32(old_encode_dev(inode->i_rdev)); |
| 3173 | raw_inode->i_block[1] = 0; |
| 3174 | } else { |
| 3175 | raw_inode->i_block[0] = 0; |
| 3176 | raw_inode->i_block[1] = |
| 3177 | cpu_to_le32(new_encode_dev(inode->i_rdev)); |
| 3178 | raw_inode->i_block[2] = 0; |
| 3179 | } |
| 3180 | } else for (block = 0; block < EXT3_N_BLOCKS; block++) |
| 3181 | raw_inode->i_block[block] = ei->i_data[block]; |
| 3182 | |
Andreas Gruenbacher | ff87b37 | 2005-07-07 17:57:00 -0700 | [diff] [blame] | 3183 | if (ei->i_extra_isize) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3184 | raw_inode->i_extra_isize = cpu_to_le16(ei->i_extra_isize); |
| 3185 | |
| 3186 | BUFFER_TRACE(bh, "call ext3_journal_dirty_metadata"); |
Chris Mason | 4f003fd | 2009-09-08 00:22:14 +0200 | [diff] [blame] | 3187 | unlock_buffer(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3188 | rc = ext3_journal_dirty_metadata(handle, bh); |
| 3189 | if (!err) |
| 3190 | err = rc; |
Jan Kara | 9df9393 | 2010-01-06 21:58:48 +0100 | [diff] [blame] | 3191 | ext3_clear_inode_state(inode, EXT3_STATE_NEW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3192 | |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 3193 | atomic_set(&ei->i_sync_tid, handle->h_transaction->t_tid); |
Jan Kara | 156bddd | 2012-09-03 16:50:42 +0200 | [diff] [blame] | 3194 | if (need_datasync) |
| 3195 | atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3196 | out_brelse: |
| 3197 | brelse (bh); |
| 3198 | ext3_std_error(inode->i_sb, err); |
| 3199 | return err; |
| 3200 | } |
| 3201 | |
| 3202 | /* |
| 3203 | * ext3_write_inode() |
| 3204 | * |
| 3205 | * We are called from a few places: |
| 3206 | * |
| 3207 | * - Within generic_file_write() for O_SYNC files. |
| 3208 | * Here, there will be no transaction running. We wait for any running |
Anatol Pomozov | 4907cb7 | 2012-09-01 10:31:09 -0700 | [diff] [blame] | 3209 | * transaction to commit. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3210 | * |
| 3211 | * - Within sys_sync(), kupdate and such. |
| 3212 | * We wait on commit, if tol to. |
| 3213 | * |
| 3214 | * - Within prune_icache() (PF_MEMALLOC == true) |
| 3215 | * Here we simply return. We can't afford to block kswapd on the |
| 3216 | * journal commit. |
| 3217 | * |
| 3218 | * In all cases it is actually safe for us to return without doing anything, |
| 3219 | * because the inode has been copied into a raw inode buffer in |
| 3220 | * ext3_mark_inode_dirty(). This is a correctness thing for O_SYNC and for |
| 3221 | * knfsd. |
| 3222 | * |
| 3223 | * Note that we are absolutely dependent upon all inode dirtiers doing the |
| 3224 | * right thing: they *must* call mark_inode_dirty() after dirtying info in |
| 3225 | * which we are interested. |
| 3226 | * |
| 3227 | * It would be a bug for them to not do this. The code: |
| 3228 | * |
| 3229 | * mark_inode_dirty(inode) |
| 3230 | * stuff(); |
| 3231 | * inode->i_size = expr; |
| 3232 | * |
| 3233 | * is in error because a kswapd-driven write_inode() could occur while |
| 3234 | * `stuff()' is running, and the new i_size will be lost. Plus the inode |
| 3235 | * will no longer be on the superblock's dirty inode list. |
| 3236 | */ |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 3237 | int ext3_write_inode(struct inode *inode, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3238 | { |
| 3239 | if (current->flags & PF_MEMALLOC) |
| 3240 | return 0; |
| 3241 | |
| 3242 | if (ext3_journal_current_handle()) { |
Jose R. Santos | 9ad163a | 2007-10-18 23:39:23 -0700 | [diff] [blame] | 3243 | jbd_debug(1, "called recursively, non-PF_MEMALLOC!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3244 | dump_stack(); |
| 3245 | return -EIO; |
| 3246 | } |
| 3247 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 3248 | if (wbc->sync_mode != WB_SYNC_ALL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3249 | return 0; |
| 3250 | |
| 3251 | return ext3_force_commit(inode->i_sb); |
| 3252 | } |
| 3253 | |
| 3254 | /* |
| 3255 | * ext3_setattr() |
| 3256 | * |
| 3257 | * Called from notify_change. |
| 3258 | * |
| 3259 | * We want to trap VFS attempts to truncate the file as soon as |
| 3260 | * possible. In particular, we want to make sure that when the VFS |
| 3261 | * shrinks i_size, we put the inode on the orphan list and modify |
| 3262 | * i_disksize immediately, so that during the subsequent flushing of |
| 3263 | * dirty pages and freeing of disk blocks, we can guarantee that any |
| 3264 | * commit will leave the blocks being flushed in an unused state on |
| 3265 | * disk. (On recovery, the inode will get truncated and the blocks will |
| 3266 | * be freed, so we have a strong guarantee that no future commit will |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3267 | * leave these blocks visible to the user.) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3268 | * |
| 3269 | * Called with inode->sem down. |
| 3270 | */ |
| 3271 | int ext3_setattr(struct dentry *dentry, struct iattr *attr) |
| 3272 | { |
| 3273 | struct inode *inode = dentry->d_inode; |
| 3274 | int error, rc = 0; |
| 3275 | const unsigned int ia_valid = attr->ia_valid; |
| 3276 | |
| 3277 | error = inode_change_ok(inode, attr); |
| 3278 | if (error) |
| 3279 | return error; |
| 3280 | |
Dmitry Monakhov | 1275562 | 2010-04-08 22:04:20 +0400 | [diff] [blame] | 3281 | if (is_quota_modification(inode, attr)) |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 3282 | dquot_initialize(inode); |
Eric W. Biederman | 1523299 | 2012-02-07 15:41:24 -0800 | [diff] [blame] | 3283 | if ((ia_valid & ATTR_UID && !uid_eq(attr->ia_uid, inode->i_uid)) || |
| 3284 | (ia_valid & ATTR_GID && !gid_eq(attr->ia_gid, inode->i_gid))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3285 | handle_t *handle; |
| 3286 | |
| 3287 | /* (user+group)*(old+new) structure, inode write (sb, |
| 3288 | * inode block, ? - but truncate inode update has it) */ |
Dmitry Monakhov | c459001 | 2009-12-09 03:05:30 +0300 | [diff] [blame] | 3289 | handle = ext3_journal_start(inode, EXT3_MAXQUOTAS_INIT_BLOCKS(inode->i_sb)+ |
| 3290 | EXT3_MAXQUOTAS_DEL_BLOCKS(inode->i_sb)+3); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3291 | if (IS_ERR(handle)) { |
| 3292 | error = PTR_ERR(handle); |
| 3293 | goto err_out; |
| 3294 | } |
Christoph Hellwig | b43fa82 | 2010-03-03 09:05:03 -0500 | [diff] [blame] | 3295 | error = dquot_transfer(inode, attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3296 | if (error) { |
| 3297 | ext3_journal_stop(handle); |
| 3298 | return error; |
| 3299 | } |
| 3300 | /* Update corresponding info in inode so that everything is in |
| 3301 | * one transaction */ |
| 3302 | if (attr->ia_valid & ATTR_UID) |
| 3303 | inode->i_uid = attr->ia_uid; |
| 3304 | if (attr->ia_valid & ATTR_GID) |
| 3305 | inode->i_gid = attr->ia_gid; |
| 3306 | error = ext3_mark_inode_dirty(handle, inode); |
| 3307 | ext3_journal_stop(handle); |
| 3308 | } |
| 3309 | |
Christoph Hellwig | 562c72a | 2011-06-24 14:29:45 -0400 | [diff] [blame] | 3310 | if (attr->ia_valid & ATTR_SIZE) |
| 3311 | inode_dio_wait(inode); |
| 3312 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3313 | if (S_ISREG(inode->i_mode) && |
| 3314 | attr->ia_valid & ATTR_SIZE && attr->ia_size < inode->i_size) { |
| 3315 | handle_t *handle; |
| 3316 | |
| 3317 | handle = ext3_journal_start(inode, 3); |
| 3318 | if (IS_ERR(handle)) { |
| 3319 | error = PTR_ERR(handle); |
| 3320 | goto err_out; |
| 3321 | } |
| 3322 | |
| 3323 | error = ext3_orphan_add(handle, inode); |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 3324 | if (error) { |
| 3325 | ext3_journal_stop(handle); |
| 3326 | goto err_out; |
| 3327 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3328 | EXT3_I(inode)->i_disksize = attr->ia_size; |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 3329 | error = ext3_mark_inode_dirty(handle, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3330 | ext3_journal_stop(handle); |
Jan Kara | ee3e77f | 2011-06-03 21:58:11 +0200 | [diff] [blame] | 3331 | if (error) { |
| 3332 | /* Some hard fs error must have happened. Bail out. */ |
| 3333 | ext3_orphan_del(NULL, inode); |
| 3334 | goto err_out; |
| 3335 | } |
| 3336 | rc = ext3_block_truncate_page(inode, attr->ia_size); |
| 3337 | if (rc) { |
| 3338 | /* Cleanup orphan list and exit */ |
| 3339 | handle = ext3_journal_start(inode, 3); |
| 3340 | if (IS_ERR(handle)) { |
| 3341 | ext3_orphan_del(NULL, inode); |
| 3342 | goto err_out; |
| 3343 | } |
| 3344 | ext3_orphan_del(handle, inode); |
| 3345 | ext3_journal_stop(handle); |
| 3346 | goto err_out; |
| 3347 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3348 | } |
| 3349 | |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3350 | if ((attr->ia_valid & ATTR_SIZE) && |
| 3351 | attr->ia_size != i_size_read(inode)) { |
Jan Kara | 40680f2f | 2011-05-24 22:24:47 +0200 | [diff] [blame] | 3352 | truncate_setsize(inode, attr->ia_size); |
| 3353 | ext3_truncate(inode); |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3354 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3355 | |
Christoph Hellwig | 1025774 | 2010-06-04 11:30:02 +0200 | [diff] [blame] | 3356 | setattr_copy(inode, attr); |
| 3357 | mark_inode_dirty(inode); |
| 3358 | |
| 3359 | if (ia_valid & ATTR_MODE) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3360 | rc = ext3_acl_chmod(inode); |
| 3361 | |
| 3362 | err_out: |
| 3363 | ext3_std_error(inode->i_sb, error); |
| 3364 | if (!error) |
| 3365 | error = rc; |
| 3366 | return error; |
| 3367 | } |
| 3368 | |
| 3369 | |
| 3370 | /* |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 3371 | * How many blocks doth make a writepage()? |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3372 | * |
| 3373 | * With N blocks per page, it may be: |
| 3374 | * N data blocks |
| 3375 | * 2 indirect block |
| 3376 | * 2 dindirect |
| 3377 | * 1 tindirect |
| 3378 | * N+5 bitmap blocks (from the above) |
| 3379 | * N+5 group descriptor summary blocks |
| 3380 | * 1 inode block |
| 3381 | * 1 superblock. |
| 3382 | * 2 * EXT3_SINGLEDATA_TRANS_BLOCKS for the quote files |
| 3383 | * |
| 3384 | * 3 * (N + 5) + 2 + 2 * EXT3_SINGLEDATA_TRANS_BLOCKS |
| 3385 | * |
| 3386 | * With ordered or writeback data it's the same, less the N data blocks. |
| 3387 | * |
| 3388 | * If the inode's direct blocks can hold an integral number of pages then a |
| 3389 | * page cannot straddle two indirect blocks, and we can only touch one indirect |
| 3390 | * and dindirect block, and the "5" above becomes "3". |
| 3391 | * |
| 3392 | * This still overestimates under most circumstances. If we were to pass the |
| 3393 | * start and end offsets in here as well we could do block_to_path() on each |
| 3394 | * block and work out the exact number of indirects which are touched. Pah. |
| 3395 | */ |
| 3396 | |
| 3397 | static int ext3_writepage_trans_blocks(struct inode *inode) |
| 3398 | { |
| 3399 | int bpp = ext3_journal_blocks_per_page(inode); |
| 3400 | int indirects = (EXT3_NDIR_BLOCKS % bpp) ? 5 : 3; |
| 3401 | int ret; |
| 3402 | |
| 3403 | if (ext3_should_journal_data(inode)) |
| 3404 | ret = 3 * (bpp + indirects) + 2; |
| 3405 | else |
Yongqiang Yang | 523334b | 2011-03-24 08:48:39 +0800 | [diff] [blame] | 3406 | ret = 2 * (bpp + indirects) + indirects + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3407 | |
| 3408 | #ifdef CONFIG_QUOTA |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 3409 | /* We know that structure was already allocated during dquot_initialize so |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3410 | * we will be updating only the data blocks + inodes */ |
Dmitry Monakhov | c459001 | 2009-12-09 03:05:30 +0300 | [diff] [blame] | 3411 | ret += EXT3_MAXQUOTAS_TRANS_BLOCKS(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3412 | #endif |
| 3413 | |
| 3414 | return ret; |
| 3415 | } |
| 3416 | |
| 3417 | /* |
| 3418 | * The caller must have previously called ext3_reserve_inode_write(). |
| 3419 | * Give this, we know that the caller already has write access to iloc->bh. |
| 3420 | */ |
| 3421 | int ext3_mark_iloc_dirty(handle_t *handle, |
| 3422 | struct inode *inode, struct ext3_iloc *iloc) |
| 3423 | { |
| 3424 | int err = 0; |
| 3425 | |
| 3426 | /* the do_update_inode consumes one bh->b_count */ |
| 3427 | get_bh(iloc->bh); |
| 3428 | |
| 3429 | /* ext3_do_update_inode() does journal_dirty_metadata */ |
| 3430 | err = ext3_do_update_inode(handle, inode, iloc); |
| 3431 | put_bh(iloc->bh); |
| 3432 | return err; |
| 3433 | } |
| 3434 | |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3435 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3436 | * On success, We end up with an outstanding reference count against |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3437 | * iloc->bh. This _must_ be cleaned up later. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3438 | */ |
| 3439 | |
| 3440 | int |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3441 | ext3_reserve_inode_write(handle_t *handle, struct inode *inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3442 | struct ext3_iloc *iloc) |
| 3443 | { |
| 3444 | int err = 0; |
| 3445 | if (handle) { |
| 3446 | err = ext3_get_inode_loc(inode, iloc); |
| 3447 | if (!err) { |
| 3448 | BUFFER_TRACE(iloc->bh, "get_write_access"); |
| 3449 | err = ext3_journal_get_write_access(handle, iloc->bh); |
| 3450 | if (err) { |
| 3451 | brelse(iloc->bh); |
| 3452 | iloc->bh = NULL; |
| 3453 | } |
| 3454 | } |
| 3455 | } |
| 3456 | ext3_std_error(inode->i_sb, err); |
| 3457 | return err; |
| 3458 | } |
| 3459 | |
| 3460 | /* |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 3461 | * What we do here is to mark the in-core inode as clean with respect to inode |
| 3462 | * dirtiness (it may still be data-dirty). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3463 | * This means that the in-core inode may be reaped by prune_icache |
| 3464 | * without having to perform any I/O. This is a very good thing, |
| 3465 | * because *any* task may call prune_icache - even ones which |
| 3466 | * have a transaction open against a different journal. |
| 3467 | * |
| 3468 | * Is this cheating? Not really. Sure, we haven't written the |
| 3469 | * inode out, but prune_icache isn't a user-visible syncing function. |
| 3470 | * Whenever the user wants stuff synced (sys_sync, sys_msync, sys_fsync) |
| 3471 | * we start and wait on commits. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3472 | */ |
| 3473 | int ext3_mark_inode_dirty(handle_t *handle, struct inode *inode) |
| 3474 | { |
| 3475 | struct ext3_iloc iloc; |
| 3476 | int err; |
| 3477 | |
| 3478 | might_sleep(); |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 3479 | trace_ext3_mark_inode_dirty(inode, _RET_IP_); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3480 | err = ext3_reserve_inode_write(handle, inode, &iloc); |
| 3481 | if (!err) |
| 3482 | err = ext3_mark_iloc_dirty(handle, inode, &iloc); |
| 3483 | return err; |
| 3484 | } |
| 3485 | |
| 3486 | /* |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 3487 | * ext3_dirty_inode() is called from __mark_inode_dirty() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3488 | * |
| 3489 | * We're really interested in the case where a file is being extended. |
| 3490 | * i_size has been changed by generic_commit_write() and we thus need |
| 3491 | * to include the updated inode in the current transaction. |
| 3492 | * |
Christoph Hellwig | 5dd4056 | 2010-03-03 09:05:00 -0500 | [diff] [blame] | 3493 | * Also, dquot_alloc_space() will always dirty the inode when blocks |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3494 | * are allocated to the file. |
| 3495 | * |
| 3496 | * If the inode is marked synchronous, we don't honour that here - doing |
| 3497 | * so would cause a commit on atime updates, which we don't bother doing. |
| 3498 | * We handle synchronous inodes at the highest possible level. |
| 3499 | */ |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 3500 | void ext3_dirty_inode(struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3501 | { |
| 3502 | handle_t *current_handle = ext3_journal_current_handle(); |
| 3503 | handle_t *handle; |
| 3504 | |
| 3505 | handle = ext3_journal_start(inode, 2); |
| 3506 | if (IS_ERR(handle)) |
| 3507 | goto out; |
| 3508 | if (current_handle && |
| 3509 | current_handle->h_transaction != handle->h_transaction) { |
| 3510 | /* This task has a transaction open against a different fs */ |
| 3511 | printk(KERN_EMERG "%s: transactions do not match!\n", |
Harvey Harrison | e05b6b5 | 2008-04-28 02:16:15 -0700 | [diff] [blame] | 3512 | __func__); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3513 | } else { |
| 3514 | jbd_debug(5, "marking dirty. outer handle=%p\n", |
| 3515 | current_handle); |
| 3516 | ext3_mark_inode_dirty(handle, inode); |
| 3517 | } |
| 3518 | ext3_journal_stop(handle); |
| 3519 | out: |
| 3520 | return; |
| 3521 | } |
| 3522 | |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 3523 | #if 0 |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3524 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3525 | * Bind an inode's backing buffer_head into this transaction, to prevent |
| 3526 | * it from being flushed to disk early. Unlike |
| 3527 | * ext3_reserve_inode_write, this leaves behind no bh reference and |
| 3528 | * returns no iloc structure, so the caller needs to repeat the iloc |
| 3529 | * lookup to mark the inode dirty later. |
| 3530 | */ |
Andrew Morton | d6859bf | 2006-03-26 01:38:03 -0800 | [diff] [blame] | 3531 | static int ext3_pin_inode(handle_t *handle, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3532 | { |
| 3533 | struct ext3_iloc iloc; |
| 3534 | |
| 3535 | int err = 0; |
| 3536 | if (handle) { |
| 3537 | err = ext3_get_inode_loc(inode, &iloc); |
| 3538 | if (!err) { |
| 3539 | BUFFER_TRACE(iloc.bh, "get_write_access"); |
| 3540 | err = journal_get_write_access(handle, iloc.bh); |
| 3541 | if (!err) |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 3542 | err = ext3_journal_dirty_metadata(handle, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3543 | iloc.bh); |
| 3544 | brelse(iloc.bh); |
| 3545 | } |
| 3546 | } |
| 3547 | ext3_std_error(inode->i_sb, err); |
| 3548 | return err; |
| 3549 | } |
| 3550 | #endif |
| 3551 | |
| 3552 | int ext3_change_inode_journal_flag(struct inode *inode, int val) |
| 3553 | { |
| 3554 | journal_t *journal; |
| 3555 | handle_t *handle; |
| 3556 | int err; |
| 3557 | |
| 3558 | /* |
| 3559 | * We have to be very careful here: changing a data block's |
| 3560 | * journaling status dynamically is dangerous. If we write a |
| 3561 | * data block to the journal, change the status and then delete |
| 3562 | * that block, we risk forgetting to revoke the old log record |
| 3563 | * from the journal and so a subsequent replay can corrupt data. |
| 3564 | * So, first we make sure that the journal is empty and that |
| 3565 | * nobody is changing anything. |
| 3566 | */ |
| 3567 | |
| 3568 | journal = EXT3_JOURNAL(inode); |
Dave Hansen | e3a68e3 | 2007-07-15 23:41:14 -0700 | [diff] [blame] | 3569 | if (is_journal_aborted(journal)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3570 | return -EROFS; |
| 3571 | |
| 3572 | journal_lock_updates(journal); |
| 3573 | journal_flush(journal); |
| 3574 | |
| 3575 | /* |
| 3576 | * OK, there are no updates running now, and all cached data is |
| 3577 | * synced to disk. We are now in a completely consistent state |
| 3578 | * which doesn't have anything in the journal, and we know that |
| 3579 | * no filesystem updates are running, so it is safe to modify |
| 3580 | * the inode's in-core data-journaling state flag now. |
| 3581 | */ |
| 3582 | |
| 3583 | if (val) |
| 3584 | EXT3_I(inode)->i_flags |= EXT3_JOURNAL_DATA_FL; |
| 3585 | else |
| 3586 | EXT3_I(inode)->i_flags &= ~EXT3_JOURNAL_DATA_FL; |
| 3587 | ext3_set_aops(inode); |
| 3588 | |
| 3589 | journal_unlock_updates(journal); |
| 3590 | |
| 3591 | /* Finally we can mark the inode as dirty. */ |
| 3592 | |
| 3593 | handle = ext3_journal_start(inode, 1); |
| 3594 | if (IS_ERR(handle)) |
| 3595 | return PTR_ERR(handle); |
| 3596 | |
| 3597 | err = ext3_mark_inode_dirty(handle, inode); |
| 3598 | handle->h_sync = 1; |
| 3599 | ext3_journal_stop(handle); |
| 3600 | ext3_std_error(inode->i_sb, err); |
| 3601 | |
| 3602 | return err; |
| 3603 | } |