Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 2 | * linux/fs/jbd2/commit.c |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 3 | * |
| 4 | * Written by Stephen C. Tweedie <sct@redhat.com>, 1998 |
| 5 | * |
| 6 | * Copyright 1998 Red Hat corp --- All Rights Reserved |
| 7 | * |
| 8 | * This file is part of the Linux kernel and is made available under |
| 9 | * the terms of the GNU General Public License, version 2, or at your |
| 10 | * option, any later version, incorporated herein by reference. |
| 11 | * |
| 12 | * Journal commit routines for the generic filesystem journaling code; |
| 13 | * part of the ext2fs journaling system. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/time.h> |
| 17 | #include <linux/fs.h> |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 18 | #include <linux/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 19 | #include <linux/errno.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/mm.h> |
| 22 | #include <linux/pagemap.h> |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 23 | #include <linux/jiffies.h> |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 24 | #include <linux/crc32.h> |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 25 | #include <linux/writeback.h> |
| 26 | #include <linux/backing-dev.h> |
Theodore Ts'o | fd98496 | 2009-01-05 21:34:13 -0500 | [diff] [blame] | 27 | #include <linux/bio.h> |
Theodore Ts'o | 0e3d2a6 | 2009-09-11 09:30:12 -0400 | [diff] [blame] | 28 | #include <linux/blkdev.h> |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 29 | #include <linux/bitops.h> |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 30 | #include <trace/events/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 31 | |
| 32 | /* |
| 33 | * Default IO end handler for temporary BJ_IO buffer_heads. |
| 34 | */ |
| 35 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) |
| 36 | { |
| 37 | BUFFER_TRACE(bh, ""); |
| 38 | if (uptodate) |
| 39 | set_buffer_uptodate(bh); |
| 40 | else |
| 41 | clear_buffer_uptodate(bh); |
| 42 | unlock_buffer(bh); |
| 43 | } |
| 44 | |
| 45 | /* |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 46 | * When an ext4 file is truncated, it is possible that some pages are not |
| 47 | * successfully freed, because they are attached to a committing transaction. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 48 | * After the transaction commits, these pages are left on the LRU, with no |
| 49 | * ->mapping, and with attached buffers. These pages are trivially reclaimable |
| 50 | * by the VM, but their apparent absence upsets the VM accounting, and it makes |
| 51 | * the numbers in /proc/meminfo look odd. |
| 52 | * |
| 53 | * So here, we have a buffer which has just come off the forget list. Look to |
| 54 | * see if we can strip all buffers from the backing page. |
| 55 | * |
| 56 | * Called under lock_journal(), and possibly under journal_datalist_lock. The |
| 57 | * caller provided us with a ref against the buffer, and we drop that here. |
| 58 | */ |
| 59 | static void release_buffer_page(struct buffer_head *bh) |
| 60 | { |
| 61 | struct page *page; |
| 62 | |
| 63 | if (buffer_dirty(bh)) |
| 64 | goto nope; |
| 65 | if (atomic_read(&bh->b_count) != 1) |
| 66 | goto nope; |
| 67 | page = bh->b_page; |
| 68 | if (!page) |
| 69 | goto nope; |
| 70 | if (page->mapping) |
| 71 | goto nope; |
| 72 | |
| 73 | /* OK, it's a truncated page */ |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 74 | if (!trylock_page(page)) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 75 | goto nope; |
| 76 | |
| 77 | page_cache_get(page); |
| 78 | __brelse(bh); |
| 79 | try_to_free_buffers(page); |
| 80 | unlock_page(page); |
| 81 | page_cache_release(page); |
| 82 | return; |
| 83 | |
| 84 | nope: |
| 85 | __brelse(bh); |
| 86 | } |
| 87 | |
| 88 | /* |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 89 | * Done it all: now submit the commit record. We should have |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 90 | * cleaned up our previous buffers by now, so if we are in abort |
| 91 | * mode we can now just skip the rest of the journal write |
| 92 | * entirely. |
| 93 | * |
| 94 | * Returns 1 if the journal needs to be aborted or 0 on success |
| 95 | */ |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 96 | static int journal_submit_commit_record(journal_t *journal, |
| 97 | transaction_t *commit_transaction, |
| 98 | struct buffer_head **cbh, |
| 99 | __u32 crc32_sum) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 100 | { |
| 101 | struct journal_head *descriptor; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 102 | struct commit_header *tmp; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 103 | struct buffer_head *bh; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 104 | int ret; |
Theodore Ts'o | 736603a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 105 | struct timespec now = current_kernel_time(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 106 | |
Zhang Huan | 6cba611 | 2011-04-05 19:16:20 -0400 | [diff] [blame] | 107 | *cbh = NULL; |
| 108 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 109 | if (is_journal_aborted(journal)) |
| 110 | return 0; |
| 111 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 112 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 113 | if (!descriptor) |
| 114 | return 1; |
| 115 | |
| 116 | bh = jh2bh(descriptor); |
| 117 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 118 | tmp = (struct commit_header *)bh->b_data; |
| 119 | tmp->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
| 120 | tmp->h_blocktype = cpu_to_be32(JBD2_COMMIT_BLOCK); |
| 121 | tmp->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
Theodore Ts'o | 736603a | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 122 | tmp->h_commit_sec = cpu_to_be64(now.tv_sec); |
| 123 | tmp->h_commit_nsec = cpu_to_be32(now.tv_nsec); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 124 | |
| 125 | if (JBD2_HAS_COMPAT_FEATURE(journal, |
| 126 | JBD2_FEATURE_COMPAT_CHECKSUM)) { |
| 127 | tmp->h_chksum_type = JBD2_CRC32_CHKSUM; |
| 128 | tmp->h_chksum_size = JBD2_CRC32_CHKSUM_SIZE; |
| 129 | tmp->h_chksum[0] = cpu_to_be32(crc32_sum); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 130 | } |
| 131 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 132 | JBUFFER_TRACE(descriptor, "submit commit block"); |
| 133 | lock_buffer(bh); |
Theodore Ts'o | 45a90bf | 2008-10-06 12:04:02 -0400 | [diff] [blame] | 134 | clear_buffer_dirty(bh); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 135 | set_buffer_uptodate(bh); |
| 136 | bh->b_end_io = journal_end_buffer_io_sync; |
| 137 | |
| 138 | if (journal->j_flags & JBD2_BARRIER && |
Theodore Ts'o | 0e3d2a6 | 2009-09-11 09:30:12 -0400 | [diff] [blame] | 139 | !JBD2_HAS_INCOMPAT_FEATURE(journal, |
Christoph Hellwig | 9c35575 | 2010-08-18 05:29:17 -0400 | [diff] [blame] | 140 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 141 | ret = submit_bh(WRITE_SYNC | WRITE_FLUSH_FUA, bh); |
Christoph Hellwig | 9c35575 | 2010-08-18 05:29:17 -0400 | [diff] [blame] | 142 | else |
Jens Axboe | 721a960 | 2011-03-09 11:56:30 +0100 | [diff] [blame] | 143 | ret = submit_bh(WRITE_SYNC, bh); |
Christoph Hellwig | 9c35575 | 2010-08-18 05:29:17 -0400 | [diff] [blame] | 144 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 145 | *cbh = bh; |
| 146 | return ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 147 | } |
| 148 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 149 | /* |
| 150 | * This function along with journal_submit_commit_record |
| 151 | * allows to write the commit record asynchronously. |
| 152 | */ |
Theodore Ts'o | fd98496 | 2009-01-05 21:34:13 -0500 | [diff] [blame] | 153 | static int journal_wait_on_commit_record(journal_t *journal, |
| 154 | struct buffer_head *bh) |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 155 | { |
| 156 | int ret = 0; |
| 157 | |
| 158 | clear_buffer_dirty(bh); |
| 159 | wait_on_buffer(bh); |
| 160 | |
| 161 | if (unlikely(!buffer_uptodate(bh))) |
| 162 | ret = -EIO; |
| 163 | put_bh(bh); /* One for getblk() */ |
| 164 | jbd2_journal_put_journal_head(bh2jh(bh)); |
| 165 | |
| 166 | return ret; |
| 167 | } |
| 168 | |
| 169 | /* |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 170 | * write the filemap data using writepage() address_space_operations. |
| 171 | * We don't do block allocation here even for delalloc. We don't |
| 172 | * use writepages() because with dealyed allocation we may be doing |
| 173 | * block allocation in writepages(). |
| 174 | */ |
| 175 | static int journal_submit_inode_data_buffers(struct address_space *mapping) |
| 176 | { |
| 177 | int ret; |
| 178 | struct writeback_control wbc = { |
| 179 | .sync_mode = WB_SYNC_ALL, |
| 180 | .nr_to_write = mapping->nrpages * 2, |
| 181 | .range_start = 0, |
| 182 | .range_end = i_size_read(mapping->host), |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 183 | }; |
| 184 | |
| 185 | ret = generic_writepages(mapping, &wbc); |
| 186 | return ret; |
| 187 | } |
| 188 | |
| 189 | /* |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 190 | * Submit all the data buffers of inode associated with the transaction to |
| 191 | * disk. |
| 192 | * |
| 193 | * We are in a committing transaction. Therefore no new inode can be added to |
| 194 | * our inode list. We use JI_COMMIT_RUNNING flag to protect inode we currently |
| 195 | * operate on from being released while we write out pages. |
| 196 | */ |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 197 | static int journal_submit_data_buffers(journal_t *journal, |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 198 | transaction_t *commit_transaction) |
| 199 | { |
| 200 | struct jbd2_inode *jinode; |
| 201 | int err, ret = 0; |
| 202 | struct address_space *mapping; |
| 203 | |
| 204 | spin_lock(&journal->j_list_lock); |
| 205 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { |
| 206 | mapping = jinode->i_vfs_inode->i_mapping; |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 207 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 208 | spin_unlock(&journal->j_list_lock); |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 209 | /* |
| 210 | * submit the inode data buffers. We use writepage |
| 211 | * instead of writepages. Because writepages can do |
| 212 | * block allocation with delalloc. We need to write |
| 213 | * only allocated blocks here. |
| 214 | */ |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 215 | trace_jbd2_submit_inode_data(jinode->i_vfs_inode); |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 216 | err = journal_submit_inode_data_buffers(mapping); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 217 | if (!ret) |
| 218 | ret = err; |
| 219 | spin_lock(&journal->j_list_lock); |
| 220 | J_ASSERT(jinode->i_transaction == commit_transaction); |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 221 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
| 222 | smp_mb__after_clear_bit(); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 223 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
| 224 | } |
| 225 | spin_unlock(&journal->j_list_lock); |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * Wait for data submitted for writeout, refile inodes to proper |
| 231 | * transaction if needed. |
| 232 | * |
| 233 | */ |
| 234 | static int journal_finish_inode_data_buffers(journal_t *journal, |
| 235 | transaction_t *commit_transaction) |
| 236 | { |
| 237 | struct jbd2_inode *jinode, *next_i; |
| 238 | int err, ret = 0; |
| 239 | |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 240 | /* For locking, see the comment in journal_submit_data_buffers() */ |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 241 | spin_lock(&journal->j_list_lock); |
| 242 | list_for_each_entry(jinode, &commit_transaction->t_inode_list, i_list) { |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 243 | set_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 244 | spin_unlock(&journal->j_list_lock); |
| 245 | err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping); |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 246 | if (err) { |
| 247 | /* |
| 248 | * Because AS_EIO is cleared by |
Christoph Hellwig | 94004ed | 2009-09-30 22:16:33 +0200 | [diff] [blame] | 249 | * filemap_fdatawait_range(), set it again so |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 250 | * that user process can get -EIO from fsync(). |
| 251 | */ |
| 252 | set_bit(AS_EIO, |
| 253 | &jinode->i_vfs_inode->i_mapping->flags); |
| 254 | |
| 255 | if (!ret) |
| 256 | ret = err; |
| 257 | } |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 258 | spin_lock(&journal->j_list_lock); |
Brian King | 39e3ac2 | 2010-10-27 21:25:12 -0400 | [diff] [blame] | 259 | clear_bit(__JI_COMMIT_RUNNING, &jinode->i_flags); |
| 260 | smp_mb__after_clear_bit(); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 261 | wake_up_bit(&jinode->i_flags, __JI_COMMIT_RUNNING); |
| 262 | } |
| 263 | |
| 264 | /* Now refile inode to proper lists */ |
| 265 | list_for_each_entry_safe(jinode, next_i, |
| 266 | &commit_transaction->t_inode_list, i_list) { |
| 267 | list_del(&jinode->i_list); |
| 268 | if (jinode->i_next_transaction) { |
| 269 | jinode->i_transaction = jinode->i_next_transaction; |
| 270 | jinode->i_next_transaction = NULL; |
| 271 | list_add(&jinode->i_list, |
| 272 | &jinode->i_transaction->t_inode_list); |
| 273 | } else { |
| 274 | jinode->i_transaction = NULL; |
| 275 | } |
| 276 | } |
| 277 | spin_unlock(&journal->j_list_lock); |
| 278 | |
| 279 | return ret; |
| 280 | } |
| 281 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 282 | static __u32 jbd2_checksum_data(__u32 crc32_sum, struct buffer_head *bh) |
| 283 | { |
| 284 | struct page *page = bh->b_page; |
| 285 | char *addr; |
| 286 | __u32 checksum; |
| 287 | |
Cong Wang | 303a8f2 | 2011-11-25 23:14:31 +0800 | [diff] [blame] | 288 | addr = kmap_atomic(page); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 289 | checksum = crc32_be(crc32_sum, |
| 290 | (void *)(addr + offset_in_page(bh->b_data)), bh->b_size); |
Cong Wang | 303a8f2 | 2011-11-25 23:14:31 +0800 | [diff] [blame] | 291 | kunmap_atomic(addr); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 292 | |
| 293 | return checksum; |
| 294 | } |
| 295 | |
| 296 | static void write_tag_block(int tag_bytes, journal_block_tag_t *tag, |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 297 | unsigned long long block) |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 298 | { |
| 299 | tag->t_blocknr = cpu_to_be32(block & (u32)~0); |
Mingming Cao | cd02ff0 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 300 | if (tag_bytes > JBD2_TAG_SIZE32) |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 301 | tag->t_blocknr_high = cpu_to_be32((block >> 31) >> 1); |
| 302 | } |
| 303 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 304 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 305 | * jbd2_journal_commit_transaction |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 306 | * |
| 307 | * The primary function for committing a transaction to the log. This |
| 308 | * function is called by the journal thread to begin a complete commit. |
| 309 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 310 | void jbd2_journal_commit_transaction(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 311 | { |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 312 | struct transaction_stats_s stats; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 313 | transaction_t *commit_transaction; |
| 314 | struct journal_head *jh, *new_jh, *descriptor; |
| 315 | struct buffer_head **wbuf = journal->j_wbuf; |
| 316 | int bufs; |
| 317 | int flags; |
| 318 | int err; |
Mingming Cao | 18eba7a | 2006-10-11 01:21:13 -0700 | [diff] [blame] | 319 | unsigned long long blocknr; |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 320 | ktime_t start_time; |
| 321 | u64 commit_time; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 322 | char *tagp = NULL; |
| 323 | journal_header_t *header; |
| 324 | journal_block_tag_t *tag = NULL; |
| 325 | int space_left = 0; |
| 326 | int first_tag = 0; |
| 327 | int tag_flag; |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 328 | int i, to_free = 0; |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 329 | int tag_bytes = journal_tag_bytes(journal); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 330 | struct buffer_head *cbh = NULL; /* For transactional checksums */ |
| 331 | __u32 crc32_sum = ~0; |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 332 | struct blk_plug plug; |
Jan Kara | 3339578 | 2012-03-13 22:45:38 -0400 | [diff] [blame] | 333 | /* Tail of the journal */ |
| 334 | unsigned long first_block; |
| 335 | tid_t first_tid; |
| 336 | int update_tail; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 337 | |
| 338 | /* |
| 339 | * First job: lock down the current transaction and wait for |
| 340 | * all outstanding updates to complete. |
| 341 | */ |
| 342 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 343 | /* Do we need to erase the effects of a prior jbd2_journal_flush? */ |
| 344 | if (journal->j_flags & JBD2_FLUSHED) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 345 | jbd_debug(3, "super block updated\n"); |
Jan Kara | a78bb11 | 2012-03-13 15:43:04 -0400 | [diff] [blame] | 346 | mutex_lock(&journal->j_checkpoint_mutex); |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 347 | /* |
| 348 | * We hold j_checkpoint_mutex so tail cannot change under us. |
| 349 | * We don't need any special data guarantees for writing sb |
| 350 | * since journal is empty and it is ok for write to be |
| 351 | * flushed only with transaction commit. |
| 352 | */ |
| 353 | jbd2_journal_update_sb_log_tail(journal, |
| 354 | journal->j_tail_sequence, |
| 355 | journal->j_tail, |
| 356 | WRITE_SYNC); |
Jan Kara | a78bb11 | 2012-03-13 15:43:04 -0400 | [diff] [blame] | 357 | mutex_unlock(&journal->j_checkpoint_mutex); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 358 | } else { |
| 359 | jbd_debug(3, "superblock not updated\n"); |
| 360 | } |
| 361 | |
| 362 | J_ASSERT(journal->j_running_transaction != NULL); |
| 363 | J_ASSERT(journal->j_committing_transaction == NULL); |
| 364 | |
| 365 | commit_transaction = journal->j_running_transaction; |
| 366 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
| 367 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 368 | trace_jbd2_start_commit(journal, commit_transaction); |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 369 | jbd_debug(1, "JBD2: starting commit of transaction %d\n", |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 370 | commit_transaction->t_tid); |
| 371 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 372 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 373 | commit_transaction->t_state = T_LOCKED; |
| 374 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 375 | trace_jbd2_commit_locking(journal, commit_transaction); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 376 | stats.run.rs_wait = commit_transaction->t_max_wait; |
| 377 | stats.run.rs_locked = jiffies; |
| 378 | stats.run.rs_running = jbd2_time_diff(commit_transaction->t_start, |
| 379 | stats.run.rs_locked); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 380 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 381 | spin_lock(&commit_transaction->t_handle_lock); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 382 | while (atomic_read(&commit_transaction->t_updates)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 383 | DEFINE_WAIT(wait); |
| 384 | |
| 385 | prepare_to_wait(&journal->j_wait_updates, &wait, |
| 386 | TASK_UNINTERRUPTIBLE); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 387 | if (atomic_read(&commit_transaction->t_updates)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 388 | spin_unlock(&commit_transaction->t_handle_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 389 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 390 | schedule(); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 391 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 392 | spin_lock(&commit_transaction->t_handle_lock); |
| 393 | } |
| 394 | finish_wait(&journal->j_wait_updates, &wait); |
| 395 | } |
| 396 | spin_unlock(&commit_transaction->t_handle_lock); |
| 397 | |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 398 | J_ASSERT (atomic_read(&commit_transaction->t_outstanding_credits) <= |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 399 | journal->j_max_transaction_buffers); |
| 400 | |
| 401 | /* |
| 402 | * First thing we are allowed to do is to discard any remaining |
| 403 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume |
| 404 | * that there are no such buffers: if a large filesystem |
| 405 | * operation like a truncate needs to split itself over multiple |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 406 | * transactions, then it may try to do a jbd2_journal_restart() while |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 407 | * there are still BJ_Reserved buffers outstanding. These must |
| 408 | * be released cleanly from the current transaction. |
| 409 | * |
| 410 | * In this case, the filesystem must still reserve write access |
| 411 | * again before modifying the buffer in the new transaction, but |
| 412 | * we do not require it to remember exactly which old buffers it |
| 413 | * has reserved. This is consistent with the existing behaviour |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 414 | * that multiple jbd2_journal_get_write_access() calls to the same |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 415 | * buffer are perfectly permissible. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 416 | */ |
| 417 | while (commit_transaction->t_reserved_list) { |
| 418 | jh = commit_transaction->t_reserved_list; |
| 419 | JBUFFER_TRACE(jh, "reserved, unused: refile"); |
| 420 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 421 | * A jbd2_journal_get_undo_access()+jbd2_journal_release_buffer() may |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 422 | * leave undo-committed data. |
| 423 | */ |
| 424 | if (jh->b_committed_data) { |
| 425 | struct buffer_head *bh = jh2bh(jh); |
| 426 | |
| 427 | jbd_lock_bh_state(bh); |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 428 | jbd2_free(jh->b_committed_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 429 | jh->b_committed_data = NULL; |
| 430 | jbd_unlock_bh_state(bh); |
| 431 | } |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 432 | jbd2_journal_refile_buffer(journal, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Now try to drop any written-back buffers from the journal's |
| 437 | * checkpoint lists. We do this *before* commit because it potentially |
| 438 | * frees some memory |
| 439 | */ |
| 440 | spin_lock(&journal->j_list_lock); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 441 | __jbd2_journal_clean_checkpoint_list(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 442 | spin_unlock(&journal->j_list_lock); |
| 443 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 444 | jbd_debug(3, "JBD2: commit phase 1\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 445 | |
| 446 | /* |
Yongqiang Yang | 1ba3726 | 2011-12-28 17:46:46 -0500 | [diff] [blame] | 447 | * Clear revoked flag to reflect there is no revoked buffers |
| 448 | * in the next transaction which is going to be started. |
| 449 | */ |
| 450 | jbd2_clear_buffer_revoked_flags(journal); |
| 451 | |
| 452 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 453 | * Switch to a new revoke table. |
| 454 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 455 | jbd2_journal_switch_revoke_table(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 456 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 457 | trace_jbd2_commit_flushing(journal, commit_transaction); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 458 | stats.run.rs_flushing = jiffies; |
| 459 | stats.run.rs_locked = jbd2_time_diff(stats.run.rs_locked, |
| 460 | stats.run.rs_flushing); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 461 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 462 | commit_transaction->t_state = T_FLUSH; |
| 463 | journal->j_committing_transaction = commit_transaction; |
| 464 | journal->j_running_transaction = NULL; |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 465 | start_time = ktime_get(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 466 | commit_transaction->t_log_start = journal->j_head; |
| 467 | wake_up(&journal->j_wait_transaction_locked); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 468 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 469 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 470 | jbd_debug(3, "JBD2: commit phase 2\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 471 | |
| 472 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 473 | * Now start flushing things to disk, in the order they appear |
| 474 | * on the transaction lists. Data blocks go first. |
| 475 | */ |
Aneesh Kumar K.V | cd1aac3 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 476 | err = journal_submit_data_buffers(journal, commit_transaction); |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 477 | if (err) |
| 478 | jbd2_journal_abort(journal, err); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 479 | |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 480 | blk_start_plug(&plug); |
Theodore Ts'o | 67c457a | 2009-04-14 07:50:56 -0400 | [diff] [blame] | 481 | jbd2_journal_write_revoke_records(journal, commit_transaction, |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 482 | WRITE_SYNC); |
| 483 | blk_finish_plug(&plug); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 484 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 485 | jbd_debug(3, "JBD2: commit phase 2\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 486 | |
| 487 | /* |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 488 | * Way to go: we have now written out all of the data for a |
| 489 | * transaction! Now comes the tricky part: we need to write out |
| 490 | * metadata. Loop over the transaction's entire buffer list: |
| 491 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 492 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 493 | commit_transaction->t_state = T_COMMIT; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 494 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 495 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 496 | trace_jbd2_commit_logging(journal, commit_transaction); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 497 | stats.run.rs_logging = jiffies; |
| 498 | stats.run.rs_flushing = jbd2_time_diff(stats.run.rs_flushing, |
| 499 | stats.run.rs_logging); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 500 | stats.run.rs_blocks = |
| 501 | atomic_read(&commit_transaction->t_outstanding_credits); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 502 | stats.run.rs_blocks_logged = 0; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 503 | |
Josef Bacik | 1dfc322 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 504 | J_ASSERT(commit_transaction->t_nr_buffers <= |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 505 | atomic_read(&commit_transaction->t_outstanding_credits)); |
Josef Bacik | 1dfc322 | 2008-04-17 10:38:59 -0400 | [diff] [blame] | 506 | |
Jan Kara | 87c89c2 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 507 | err = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 508 | descriptor = NULL; |
| 509 | bufs = 0; |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 510 | blk_start_plug(&plug); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 511 | while (commit_transaction->t_buffers) { |
| 512 | |
| 513 | /* Find the next buffer to be journaled... */ |
| 514 | |
| 515 | jh = commit_transaction->t_buffers; |
| 516 | |
| 517 | /* If we're in abort mode, we just un-journal the buffer and |
Hidehiro Kawai | 7ad7445 | 2008-10-10 20:29:31 -0400 | [diff] [blame] | 518 | release it. */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 519 | |
| 520 | if (is_journal_aborted(journal)) { |
Hidehiro Kawai | 7ad7445 | 2008-10-10 20:29:31 -0400 | [diff] [blame] | 521 | clear_buffer_jbddirty(jh2bh(jh)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 522 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 523 | jbd2_buffer_abort_trigger(jh, |
| 524 | jh->b_frozen_data ? |
| 525 | jh->b_frozen_triggers : |
| 526 | jh->b_triggers); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 527 | jbd2_journal_refile_buffer(journal, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 528 | /* If that was the last one, we need to clean up |
| 529 | * any descriptor buffers which may have been |
| 530 | * already allocated, even if we are now |
| 531 | * aborting. */ |
| 532 | if (!commit_transaction->t_buffers) |
| 533 | goto start_journal_io; |
| 534 | continue; |
| 535 | } |
| 536 | |
| 537 | /* Make sure we have a descriptor block in which to |
| 538 | record the metadata buffer. */ |
| 539 | |
| 540 | if (!descriptor) { |
| 541 | struct buffer_head *bh; |
| 542 | |
| 543 | J_ASSERT (bufs == 0); |
| 544 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 545 | jbd_debug(4, "JBD2: get descriptor\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 546 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 547 | descriptor = jbd2_journal_get_descriptor_buffer(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 548 | if (!descriptor) { |
Jan Kara | a7fa2ba | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 549 | jbd2_journal_abort(journal, -EIO); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 550 | continue; |
| 551 | } |
| 552 | |
| 553 | bh = jh2bh(descriptor); |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 554 | jbd_debug(4, "JBD2: got buffer %llu (%p)\n", |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 555 | (unsigned long long)bh->b_blocknr, bh->b_data); |
| 556 | header = (journal_header_t *)&bh->b_data[0]; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 557 | header->h_magic = cpu_to_be32(JBD2_MAGIC_NUMBER); |
| 558 | header->h_blocktype = cpu_to_be32(JBD2_DESCRIPTOR_BLOCK); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 559 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
| 560 | |
| 561 | tagp = &bh->b_data[sizeof(journal_header_t)]; |
| 562 | space_left = bh->b_size - sizeof(journal_header_t); |
| 563 | first_tag = 1; |
| 564 | set_buffer_jwrite(bh); |
| 565 | set_buffer_dirty(bh); |
| 566 | wbuf[bufs++] = bh; |
| 567 | |
| 568 | /* Record it so that we can wait for IO |
| 569 | completion later */ |
| 570 | BUFFER_TRACE(bh, "ph3: file as descriptor"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 571 | jbd2_journal_file_buffer(descriptor, commit_transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 572 | BJ_LogCtl); |
| 573 | } |
| 574 | |
| 575 | /* Where is the buffer to be written? */ |
| 576 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 577 | err = jbd2_journal_next_log_block(journal, &blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 578 | /* If the block mapping failed, just abandon the buffer |
| 579 | and repeat this loop: we'll fall into the |
| 580 | refile-on-abort condition above. */ |
| 581 | if (err) { |
Jan Kara | a7fa2ba | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 582 | jbd2_journal_abort(journal, err); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 583 | continue; |
| 584 | } |
| 585 | |
| 586 | /* |
| 587 | * start_this_handle() uses t_outstanding_credits to determine |
| 588 | * the free space in the log, but this counter is changed |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 589 | * by jbd2_journal_next_log_block() also. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 590 | */ |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 591 | atomic_dec(&commit_transaction->t_outstanding_credits); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 592 | |
| 593 | /* Bump b_count to prevent truncate from stumbling over |
| 594 | the shadowed buffer! @@@ This can go if we ever get |
| 595 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ |
| 596 | atomic_inc(&jh2bh(jh)->b_count); |
| 597 | |
| 598 | /* Make a temporary IO buffer with which to write it out |
| 599 | (this will requeue both the metadata buffer and the |
| 600 | temporary IO buffer). new_bh goes on BJ_IO*/ |
| 601 | |
| 602 | set_bit(BH_JWrite, &jh2bh(jh)->b_state); |
| 603 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 604 | * akpm: jbd2_journal_write_metadata_buffer() sets |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 605 | * new_bh->b_transaction to commit_transaction. |
| 606 | * We need to clean this up before we release new_bh |
| 607 | * (which is of type BJ_IO) |
| 608 | */ |
| 609 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 610 | flags = jbd2_journal_write_metadata_buffer(commit_transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 611 | jh, &new_jh, blocknr); |
Theodore Ts'o | e6ec116 | 2009-12-01 09:04:42 -0500 | [diff] [blame] | 612 | if (flags < 0) { |
| 613 | jbd2_journal_abort(journal, flags); |
| 614 | continue; |
| 615 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 616 | set_bit(BH_JWrite, &jh2bh(new_jh)->b_state); |
| 617 | wbuf[bufs++] = jh2bh(new_jh); |
| 618 | |
| 619 | /* Record the new block's tag in the current descriptor |
| 620 | buffer */ |
| 621 | |
| 622 | tag_flag = 0; |
| 623 | if (flags & 1) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 624 | tag_flag |= JBD2_FLAG_ESCAPE; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 625 | if (!first_tag) |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 626 | tag_flag |= JBD2_FLAG_SAME_UUID; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 627 | |
| 628 | tag = (journal_block_tag_t *) tagp; |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 629 | write_tag_block(tag_bytes, tag, jh2bh(jh)->b_blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 630 | tag->t_flags = cpu_to_be32(tag_flag); |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 631 | tagp += tag_bytes; |
| 632 | space_left -= tag_bytes; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 633 | |
| 634 | if (first_tag) { |
| 635 | memcpy (tagp, journal->j_uuid, 16); |
| 636 | tagp += 16; |
| 637 | space_left -= 16; |
| 638 | first_tag = 0; |
| 639 | } |
| 640 | |
| 641 | /* If there's no more to do, or if the descriptor is full, |
| 642 | let the IO rip! */ |
| 643 | |
| 644 | if (bufs == journal->j_wbufsize || |
| 645 | commit_transaction->t_buffers == NULL || |
Zach Brown | b517bea | 2006-10-11 01:21:08 -0700 | [diff] [blame] | 646 | space_left < tag_bytes + 16) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 647 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 648 | jbd_debug(4, "JBD2: Submit %d IOs\n", bufs); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 649 | |
| 650 | /* Write an end-of-descriptor marker before |
| 651 | submitting the IOs. "tag" still points to |
| 652 | the last tag we set up. */ |
| 653 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 654 | tag->t_flags |= cpu_to_be32(JBD2_FLAG_LAST_TAG); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 655 | |
| 656 | start_journal_io: |
| 657 | for (i = 0; i < bufs; i++) { |
| 658 | struct buffer_head *bh = wbuf[i]; |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 659 | /* |
| 660 | * Compute checksum. |
| 661 | */ |
| 662 | if (JBD2_HAS_COMPAT_FEATURE(journal, |
| 663 | JBD2_FEATURE_COMPAT_CHECKSUM)) { |
| 664 | crc32_sum = |
| 665 | jbd2_checksum_data(crc32_sum, bh); |
| 666 | } |
| 667 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 668 | lock_buffer(bh); |
| 669 | clear_buffer_dirty(bh); |
| 670 | set_buffer_uptodate(bh); |
| 671 | bh->b_end_io = journal_end_buffer_io_sync; |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 672 | submit_bh(WRITE_SYNC, bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 673 | } |
| 674 | cond_resched(); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 675 | stats.run.rs_blocks_logged += bufs; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 676 | |
| 677 | /* Force a new descriptor to be generated next |
| 678 | time round the loop. */ |
| 679 | descriptor = NULL; |
| 680 | bufs = 0; |
| 681 | } |
| 682 | } |
| 683 | |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 684 | err = journal_finish_inode_data_buffers(journal, commit_transaction); |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 685 | if (err) { |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 686 | printk(KERN_WARNING |
| 687 | "JBD2: Detected IO errors while flushing file data " |
Theodore Ts'o | 0549676 | 2008-09-16 14:36:17 -0400 | [diff] [blame] | 688 | "on %s\n", journal->j_devname); |
Hidehiro Kawai | 5bf5683 | 2008-10-10 22:12:43 -0400 | [diff] [blame] | 689 | if (journal->j_flags & JBD2_ABORT_ON_SYNCDATA_ERR) |
| 690 | jbd2_journal_abort(journal, err); |
Hidehiro Kawai | e9e34f4 | 2008-07-31 22:26:04 -0400 | [diff] [blame] | 691 | err = 0; |
| 692 | } |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 693 | |
Jan Kara | 3339578 | 2012-03-13 22:45:38 -0400 | [diff] [blame] | 694 | /* |
| 695 | * Get current oldest transaction in the log before we issue flush |
| 696 | * to the filesystem device. After the flush we can be sure that |
| 697 | * blocks of all older transactions are checkpointed to persistent |
| 698 | * storage and we will be safe to update journal start in the |
| 699 | * superblock with the numbers we get here. |
| 700 | */ |
| 701 | update_tail = |
| 702 | jbd2_journal_get_log_tail(journal, &first_tid, &first_block); |
| 703 | |
Jan Kara | bbd2be3 | 2011-05-24 11:59:18 -0400 | [diff] [blame] | 704 | write_lock(&journal->j_state_lock); |
Jan Kara | 3339578 | 2012-03-13 22:45:38 -0400 | [diff] [blame] | 705 | if (update_tail) { |
| 706 | long freed = first_block - journal->j_tail; |
| 707 | |
| 708 | if (first_block < journal->j_tail) |
| 709 | freed += journal->j_last - journal->j_first; |
| 710 | /* Update tail only if we free significant amount of space */ |
| 711 | if (freed < journal->j_maxlen / 4) |
| 712 | update_tail = 0; |
| 713 | } |
Jan Kara | bbd2be3 | 2011-05-24 11:59:18 -0400 | [diff] [blame] | 714 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
| 715 | commit_transaction->t_state = T_COMMIT_DFLUSH; |
| 716 | write_unlock(&journal->j_state_lock); |
Jan Kara | 3339578 | 2012-03-13 22:45:38 -0400 | [diff] [blame] | 717 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 718 | /* |
| 719 | * If the journal is not located on the file system device, |
| 720 | * then we must flush the file system device before we issue |
| 721 | * the commit record |
| 722 | */ |
Jan Kara | 81be12c | 2011-05-24 11:52:40 -0400 | [diff] [blame] | 723 | if (commit_transaction->t_need_data_flush && |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 724 | (journal->j_fs_dev != journal->j_dev) && |
| 725 | (journal->j_flags & JBD2_BARRIER)) |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 726 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL); |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 727 | |
| 728 | /* Done it all: now write the commit record asynchronously. */ |
| 729 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
| 730 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
| 731 | err = journal_submit_commit_record(journal, commit_transaction, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 732 | &cbh, crc32_sum); |
| 733 | if (err) |
| 734 | __jbd2_journal_abort_hard(journal); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 735 | } |
| 736 | |
Jens Axboe | 82f04ab | 2011-03-17 11:01:52 +0100 | [diff] [blame] | 737 | blk_finish_plug(&plug); |
| 738 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 739 | /* Lo and behold: we have just managed to send a transaction to |
| 740 | the log. Before we can commit it, wait for the IO so far to |
| 741 | complete. Control buffers being written are on the |
| 742 | transaction's t_log_list queue, and metadata buffers are on |
| 743 | the t_iobuf_list queue. |
| 744 | |
| 745 | Wait for the buffers in reverse order. That way we are |
| 746 | less likely to be woken up until all IOs have completed, and |
| 747 | so we incur less scheduling load. |
| 748 | */ |
| 749 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 750 | jbd_debug(3, "JBD2: commit phase 3\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 751 | |
| 752 | /* |
| 753 | * akpm: these are BJ_IO, and j_list_lock is not needed. |
| 754 | * See __journal_try_to_free_buffer. |
| 755 | */ |
| 756 | wait_for_iobuf: |
| 757 | while (commit_transaction->t_iobuf_list != NULL) { |
| 758 | struct buffer_head *bh; |
| 759 | |
| 760 | jh = commit_transaction->t_iobuf_list->b_tprev; |
| 761 | bh = jh2bh(jh); |
| 762 | if (buffer_locked(bh)) { |
| 763 | wait_on_buffer(bh); |
| 764 | goto wait_for_iobuf; |
| 765 | } |
| 766 | if (cond_resched()) |
| 767 | goto wait_for_iobuf; |
| 768 | |
| 769 | if (unlikely(!buffer_uptodate(bh))) |
| 770 | err = -EIO; |
| 771 | |
| 772 | clear_buffer_jwrite(bh); |
| 773 | |
| 774 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 775 | jbd2_journal_unfile_buffer(journal, jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 776 | |
| 777 | /* |
| 778 | * ->t_iobuf_list should contain only dummy buffer_heads |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 779 | * which were created by jbd2_journal_write_metadata_buffer(). |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 780 | */ |
| 781 | BUFFER_TRACE(bh, "dumping temporary bh"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 782 | jbd2_journal_put_journal_head(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 783 | __brelse(bh); |
| 784 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); |
| 785 | free_buffer_head(bh); |
| 786 | |
| 787 | /* We also have to unlock and free the corresponding |
| 788 | shadowed buffer */ |
| 789 | jh = commit_transaction->t_shadow_list->b_tprev; |
| 790 | bh = jh2bh(jh); |
| 791 | clear_bit(BH_JWrite, &bh->b_state); |
| 792 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
| 793 | |
| 794 | /* The metadata is now released for reuse, but we need |
| 795 | to remember it against this transaction so that when |
| 796 | we finally commit, we can do any checkpointing |
| 797 | required. */ |
| 798 | JBUFFER_TRACE(jh, "file as BJ_Forget"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 799 | jbd2_journal_file_buffer(jh, commit_transaction, BJ_Forget); |
Jan Kara | 229309c | 2011-05-08 19:09:53 -0400 | [diff] [blame] | 800 | /* |
| 801 | * Wake up any transactions which were waiting for this IO to |
| 802 | * complete. The barrier must be here so that changes by |
| 803 | * jbd2_journal_file_buffer() take effect before wake_up_bit() |
| 804 | * does the waitqueue check. |
| 805 | */ |
| 806 | smp_mb(); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 807 | wake_up_bit(&bh->b_state, BH_Unshadow); |
| 808 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
| 809 | __brelse(bh); |
| 810 | } |
| 811 | |
| 812 | J_ASSERT (commit_transaction->t_shadow_list == NULL); |
| 813 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 814 | jbd_debug(3, "JBD2: commit phase 4\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 815 | |
| 816 | /* Here we wait for the revoke record and descriptor record buffers */ |
| 817 | wait_for_ctlbuf: |
| 818 | while (commit_transaction->t_log_list != NULL) { |
| 819 | struct buffer_head *bh; |
| 820 | |
| 821 | jh = commit_transaction->t_log_list->b_tprev; |
| 822 | bh = jh2bh(jh); |
| 823 | if (buffer_locked(bh)) { |
| 824 | wait_on_buffer(bh); |
| 825 | goto wait_for_ctlbuf; |
| 826 | } |
| 827 | if (cond_resched()) |
| 828 | goto wait_for_ctlbuf; |
| 829 | |
| 830 | if (unlikely(!buffer_uptodate(bh))) |
| 831 | err = -EIO; |
| 832 | |
| 833 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); |
| 834 | clear_buffer_jwrite(bh); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 835 | jbd2_journal_unfile_buffer(journal, jh); |
| 836 | jbd2_journal_put_journal_head(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 837 | __brelse(bh); /* One for getblk */ |
| 838 | /* AKPM: bforget here */ |
| 839 | } |
| 840 | |
Hidehiro Kawai | 77e841d | 2008-10-12 16:39:16 -0400 | [diff] [blame] | 841 | if (err) |
| 842 | jbd2_journal_abort(journal, err); |
| 843 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 844 | jbd_debug(3, "JBD2: commit phase 5\n"); |
Jan Kara | bbd2be3 | 2011-05-24 11:59:18 -0400 | [diff] [blame] | 845 | write_lock(&journal->j_state_lock); |
| 846 | J_ASSERT(commit_transaction->t_state == T_COMMIT_DFLUSH); |
| 847 | commit_transaction->t_state = T_COMMIT_JFLUSH; |
| 848 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 849 | |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 850 | if (!JBD2_HAS_INCOMPAT_FEATURE(journal, |
Theodore Ts'o | 0e3d2a6 | 2009-09-11 09:30:12 -0400 | [diff] [blame] | 851 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT)) { |
Girish Shilamkar | 818d276 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 852 | err = journal_submit_commit_record(journal, commit_transaction, |
| 853 | &cbh, crc32_sum); |
| 854 | if (err) |
| 855 | __jbd2_journal_abort_hard(journal); |
| 856 | } |
Zhang Huan | 6cba611 | 2011-04-05 19:16:20 -0400 | [diff] [blame] | 857 | if (cbh) |
Theodore Ts'o | fd98496 | 2009-01-05 21:34:13 -0500 | [diff] [blame] | 858 | err = journal_wait_on_commit_record(journal, cbh); |
Jan Kara | f73bee4 | 2010-08-18 15:56:56 +0200 | [diff] [blame] | 859 | if (JBD2_HAS_INCOMPAT_FEATURE(journal, |
| 860 | JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) && |
| 861 | journal->j_flags & JBD2_BARRIER) { |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 862 | blkdev_issue_flush(journal->j_dev, GFP_KERNEL, NULL); |
Jan Kara | f73bee4 | 2010-08-18 15:56:56 +0200 | [diff] [blame] | 863 | } |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 864 | |
| 865 | if (err) |
Jan Kara | a7fa2ba | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 866 | jbd2_journal_abort(journal, err); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 867 | |
Jan Kara | 3339578 | 2012-03-13 22:45:38 -0400 | [diff] [blame] | 868 | /* |
| 869 | * Now disk caches for filesystem device are flushed so we are safe to |
| 870 | * erase checkpointed transactions from the log by updating journal |
| 871 | * superblock. |
| 872 | */ |
| 873 | if (update_tail) |
| 874 | jbd2_update_log_tail(journal, first_tid, first_block); |
| 875 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 876 | /* End of a transaction! Finally, we can do checkpoint |
| 877 | processing: any buffers committed as a result of this |
| 878 | transaction can be removed from any checkpoint list it was on |
| 879 | before. */ |
| 880 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 881 | jbd_debug(3, "JBD2: commit phase 6\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 882 | |
Jan Kara | c851ed5 | 2008-07-11 19:27:31 -0400 | [diff] [blame] | 883 | J_ASSERT(list_empty(&commit_transaction->t_inode_list)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 884 | J_ASSERT(commit_transaction->t_buffers == NULL); |
| 885 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); |
| 886 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); |
| 887 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
| 888 | J_ASSERT(commit_transaction->t_log_list == NULL); |
| 889 | |
| 890 | restart_loop: |
| 891 | /* |
| 892 | * As there are other places (journal_unmap_buffer()) adding buffers |
| 893 | * to this list we have to be careful and hold the j_list_lock. |
| 894 | */ |
| 895 | spin_lock(&journal->j_list_lock); |
| 896 | while (commit_transaction->t_forget) { |
| 897 | transaction_t *cp_transaction; |
| 898 | struct buffer_head *bh; |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 899 | int try_to_free = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 900 | |
| 901 | jh = commit_transaction->t_forget; |
| 902 | spin_unlock(&journal->j_list_lock); |
| 903 | bh = jh2bh(jh); |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 904 | /* |
| 905 | * Get a reference so that bh cannot be freed before we are |
| 906 | * done with it. |
| 907 | */ |
| 908 | get_bh(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 909 | jbd_lock_bh_state(bh); |
dingdinghua | 23e2af3 | 2010-02-24 12:11:20 -0500 | [diff] [blame] | 910 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 911 | |
| 912 | /* |
| 913 | * If there is undo-protected committed data against |
| 914 | * this buffer, then we can remove it now. If it is a |
| 915 | * buffer needing such protection, the old frozen_data |
| 916 | * field now points to a committed version of the |
| 917 | * buffer, so rotate that field to the new committed |
| 918 | * data. |
| 919 | * |
| 920 | * Otherwise, we can just throw away the frozen data now. |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 921 | * |
| 922 | * We also know that the frozen data has already fired |
| 923 | * its triggers if they exist, so we can clear that too. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 924 | */ |
| 925 | if (jh->b_committed_data) { |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 926 | jbd2_free(jh->b_committed_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 927 | jh->b_committed_data = NULL; |
| 928 | if (jh->b_frozen_data) { |
| 929 | jh->b_committed_data = jh->b_frozen_data; |
| 930 | jh->b_frozen_data = NULL; |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 931 | jh->b_frozen_triggers = NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 932 | } |
| 933 | } else if (jh->b_frozen_data) { |
Mingming Cao | af1e76d | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 934 | jbd2_free(jh->b_frozen_data, bh->b_size); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 935 | jh->b_frozen_data = NULL; |
Joel Becker | e06c822 | 2008-09-11 15:35:47 -0700 | [diff] [blame] | 936 | jh->b_frozen_triggers = NULL; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 937 | } |
| 938 | |
| 939 | spin_lock(&journal->j_list_lock); |
| 940 | cp_transaction = jh->b_cp_transaction; |
| 941 | if (cp_transaction) { |
| 942 | JBUFFER_TRACE(jh, "remove from old cp transaction"); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 943 | cp_transaction->t_chp_stats.cs_dropped++; |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 944 | __jbd2_journal_remove_checkpoint(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 945 | } |
| 946 | |
| 947 | /* Only re-checkpoint the buffer_head if it is marked |
| 948 | * dirty. If the buffer was added to the BJ_Forget list |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 949 | * by jbd2_journal_forget, it may no longer be dirty and |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 950 | * there's no point in keeping a checkpoint record for |
| 951 | * it. */ |
| 952 | |
| 953 | /* A buffer which has been freed while still being |
| 954 | * journaled by a previous transaction may end up still |
| 955 | * being dirty here, but we want to avoid writing back |
dingdinghua | ba86902 | 2010-02-15 16:35:42 -0500 | [diff] [blame] | 956 | * that buffer in the future after the "add to orphan" |
| 957 | * operation been committed, That's not only a performance |
| 958 | * gain, it also stops aliasing problems if the buffer is |
| 959 | * left behind for writeback and gets reallocated for another |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 960 | * use in a different page. */ |
dingdinghua | ba86902 | 2010-02-15 16:35:42 -0500 | [diff] [blame] | 961 | if (buffer_freed(bh) && !jh->b_next_transaction) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 962 | clear_buffer_freed(bh); |
| 963 | clear_buffer_jbddirty(bh); |
| 964 | } |
| 965 | |
| 966 | if (buffer_jbddirty(bh)) { |
| 967 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 968 | __jbd2_journal_insert_checkpoint(jh, commit_transaction); |
Hidehiro Kawai | 7ad7445 | 2008-10-10 20:29:31 -0400 | [diff] [blame] | 969 | if (is_journal_aborted(journal)) |
| 970 | clear_buffer_jbddirty(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 971 | } else { |
| 972 | J_ASSERT_BH(bh, !buffer_dirty(bh)); |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 973 | /* |
| 974 | * The buffer on BJ_Forget list and not jbddirty means |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 975 | * it has been freed by this transaction and hence it |
| 976 | * could not have been reallocated until this |
| 977 | * transaction has committed. *BUT* it could be |
| 978 | * reallocated once we have written all the data to |
| 979 | * disk and before we process the buffer on BJ_Forget |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 980 | * list. |
| 981 | */ |
| 982 | if (!jh->b_next_transaction) |
| 983 | try_to_free = 1; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 984 | } |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 985 | JBUFFER_TRACE(jh, "refile or unfile buffer"); |
| 986 | __jbd2_journal_refile_buffer(jh); |
| 987 | jbd_unlock_bh_state(bh); |
| 988 | if (try_to_free) |
| 989 | release_buffer_page(bh); /* Drops bh reference */ |
| 990 | else |
| 991 | __brelse(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 992 | cond_resched_lock(&journal->j_list_lock); |
| 993 | } |
| 994 | spin_unlock(&journal->j_list_lock); |
| 995 | /* |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 996 | * This is a bit sleazy. We use j_list_lock to protect transition |
| 997 | * of a transaction into T_FINISHED state and calling |
| 998 | * __jbd2_journal_drop_transaction(). Otherwise we could race with |
| 999 | * other checkpointing code processing the transaction... |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1000 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1001 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1002 | spin_lock(&journal->j_list_lock); |
| 1003 | /* |
| 1004 | * Now recheck if some buffers did not get attached to the transaction |
| 1005 | * while the lock was dropped... |
| 1006 | */ |
| 1007 | if (commit_transaction->t_forget) { |
| 1008 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1009 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1010 | goto restart_loop; |
| 1011 | } |
| 1012 | |
| 1013 | /* Done with this transaction! */ |
| 1014 | |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 1015 | jbd_debug(3, "JBD2: commit phase 7\n"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1016 | |
Jan Kara | bbd2be3 | 2011-05-24 11:59:18 -0400 | [diff] [blame] | 1017 | J_ASSERT(commit_transaction->t_state == T_COMMIT_JFLUSH); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1018 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1019 | commit_transaction->t_start = jiffies; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 1020 | stats.run.rs_logging = jbd2_time_diff(stats.run.rs_logging, |
| 1021 | commit_transaction->t_start); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1022 | |
| 1023 | /* |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 1024 | * File the transaction statistics |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1025 | */ |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1026 | stats.ts_tid = commit_transaction->t_tid; |
Theodore Ts'o | 8dd4204 | 2010-08-03 21:38:29 -0400 | [diff] [blame] | 1027 | stats.run.rs_handle_count = |
| 1028 | atomic_read(&commit_transaction->t_handle_count); |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 1029 | trace_jbd2_run_stats(journal->j_fs_dev->bd_dev, |
| 1030 | commit_transaction->t_tid, &stats.run); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1031 | |
| 1032 | /* |
| 1033 | * Calculate overall stats |
| 1034 | */ |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 1035 | spin_lock(&journal->j_history_lock); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1036 | journal->j_stats.ts_tid++; |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 1037 | journal->j_stats.run.rs_wait += stats.run.rs_wait; |
| 1038 | journal->j_stats.run.rs_running += stats.run.rs_running; |
| 1039 | journal->j_stats.run.rs_locked += stats.run.rs_locked; |
| 1040 | journal->j_stats.run.rs_flushing += stats.run.rs_flushing; |
| 1041 | journal->j_stats.run.rs_logging += stats.run.rs_logging; |
| 1042 | journal->j_stats.run.rs_handle_count += stats.run.rs_handle_count; |
| 1043 | journal->j_stats.run.rs_blocks += stats.run.rs_blocks; |
| 1044 | journal->j_stats.run.rs_blocks_logged += stats.run.rs_blocks_logged; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 1045 | spin_unlock(&journal->j_history_lock); |
| 1046 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1047 | commit_transaction->t_state = T_FINISHED; |
| 1048 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
| 1049 | journal->j_commit_sequence = commit_transaction->t_tid; |
| 1050 | journal->j_committing_transaction = NULL; |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 1051 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1052 | |
Josef Bacik | e07f718 | 2008-11-26 01:14:26 -0500 | [diff] [blame] | 1053 | /* |
| 1054 | * weight the commit time higher than the average time so we don't |
| 1055 | * react too strongly to vast changes in the commit time |
| 1056 | */ |
| 1057 | if (likely(journal->j_average_commit_time)) |
| 1058 | journal->j_average_commit_time = (commit_time + |
| 1059 | journal->j_average_commit_time*3) / 4; |
| 1060 | else |
| 1061 | journal->j_average_commit_time = commit_time; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 1062 | write_unlock(&journal->j_state_lock); |
Theodore Ts'o | 6c20ec8 | 2008-10-28 21:08:20 -0400 | [diff] [blame] | 1063 | |
Jan Kara | f89b779 | 2007-07-15 23:37:20 -0700 | [diff] [blame] | 1064 | if (commit_transaction->t_checkpoint_list == NULL && |
| 1065 | commit_transaction->t_checkpoint_io_list == NULL) { |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 1066 | __jbd2_journal_drop_transaction(journal, commit_transaction); |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1067 | to_free = 1; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1068 | } else { |
| 1069 | if (journal->j_checkpoint_transactions == NULL) { |
| 1070 | journal->j_checkpoint_transactions = commit_transaction; |
| 1071 | commit_transaction->t_cpnext = commit_transaction; |
| 1072 | commit_transaction->t_cpprev = commit_transaction; |
| 1073 | } else { |
| 1074 | commit_transaction->t_cpnext = |
| 1075 | journal->j_checkpoint_transactions; |
| 1076 | commit_transaction->t_cpprev = |
| 1077 | commit_transaction->t_cpnext->t_cpprev; |
| 1078 | commit_transaction->t_cpnext->t_cpprev = |
| 1079 | commit_transaction; |
| 1080 | commit_transaction->t_cpprev->t_cpnext = |
| 1081 | commit_transaction; |
| 1082 | } |
| 1083 | } |
| 1084 | spin_unlock(&journal->j_list_lock); |
| 1085 | |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1086 | if (journal->j_commit_callback) |
| 1087 | journal->j_commit_callback(journal, commit_transaction); |
| 1088 | |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 1089 | trace_jbd2_end_commit(journal, commit_transaction); |
Eryu Guan | f2a4452 | 2011-11-01 19:09:18 -0400 | [diff] [blame] | 1090 | jbd_debug(1, "JBD2: commit %d complete, head %d\n", |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1091 | journal->j_commit_sequence, journal->j_tail_sequence); |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 1092 | if (to_free) |
Yongqiang Yang | 0c2022e | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 1093 | jbd2_journal_free_transaction(commit_transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1094 | |
| 1095 | wake_up(&journal->j_wait_done_commit); |
| 1096 | } |