Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * linux/fs/jbd/commit.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -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> |
| 18 | #include <linux/jbd.h> |
| 19 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/mm.h> |
| 21 | #include <linux/pagemap.h> |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 22 | #include <linux/bio.h> |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 23 | #include <linux/blkdev.h> |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 24 | #include <trace/events/jbd.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | /* |
| 27 | * Default IO end handler for temporary BJ_IO buffer_heads. |
| 28 | */ |
| 29 | static void journal_end_buffer_io_sync(struct buffer_head *bh, int uptodate) |
| 30 | { |
| 31 | BUFFER_TRACE(bh, ""); |
| 32 | if (uptodate) |
| 33 | set_buffer_uptodate(bh); |
| 34 | else |
| 35 | clear_buffer_uptodate(bh); |
| 36 | unlock_buffer(bh); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * When an ext3-ordered file is truncated, it is possible that many pages are |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 41 | * not successfully freed, because they are attached to a committing transaction. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | * After the transaction commits, these pages are left on the LRU, with no |
| 43 | * ->mapping, and with attached buffers. These pages are trivially reclaimable |
| 44 | * by the VM, but their apparent absence upsets the VM accounting, and it makes |
| 45 | * the numbers in /proc/meminfo look odd. |
| 46 | * |
| 47 | * So here, we have a buffer which has just come off the forget list. Look to |
| 48 | * see if we can strip all buffers from the backing page. |
| 49 | * |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 50 | * Called under journal->j_list_lock. The caller provided us with a ref |
| 51 | * against the buffer, and we drop that here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | */ |
| 53 | static void release_buffer_page(struct buffer_head *bh) |
| 54 | { |
| 55 | struct page *page; |
| 56 | |
| 57 | if (buffer_dirty(bh)) |
| 58 | goto nope; |
| 59 | if (atomic_read(&bh->b_count) != 1) |
| 60 | goto nope; |
| 61 | page = bh->b_page; |
| 62 | if (!page) |
| 63 | goto nope; |
| 64 | if (page->mapping) |
| 65 | goto nope; |
| 66 | |
| 67 | /* OK, it's a truncated page */ |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 68 | if (!trylock_page(page)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | goto nope; |
| 70 | |
| 71 | page_cache_get(page); |
| 72 | __brelse(bh); |
| 73 | try_to_free_buffers(page); |
| 74 | unlock_page(page); |
| 75 | page_cache_release(page); |
| 76 | return; |
| 77 | |
| 78 | nope: |
| 79 | __brelse(bh); |
| 80 | } |
| 81 | |
| 82 | /* |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 83 | * Decrement reference counter for data buffer. If it has been marked |
| 84 | * 'BH_Freed', release it and the page to which it belongs if possible. |
| 85 | */ |
| 86 | static void release_data_buffer(struct buffer_head *bh) |
| 87 | { |
| 88 | if (buffer_freed(bh)) { |
| 89 | clear_buffer_freed(bh); |
| 90 | release_buffer_page(bh); |
| 91 | } else |
| 92 | put_bh(bh); |
| 93 | } |
| 94 | |
| 95 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | * Try to acquire jbd_lock_bh_state() against the buffer, when j_list_lock is |
| 97 | * held. For ranking reasons we must trylock. If we lose, schedule away and |
| 98 | * return 0. j_list_lock is dropped in this case. |
| 99 | */ |
| 100 | static int inverted_lock(journal_t *journal, struct buffer_head *bh) |
| 101 | { |
| 102 | if (!jbd_trylock_bh_state(bh)) { |
| 103 | spin_unlock(&journal->j_list_lock); |
| 104 | schedule(); |
| 105 | return 0; |
| 106 | } |
| 107 | return 1; |
| 108 | } |
| 109 | |
| 110 | /* Done it all: now write the commit record. We should have |
| 111 | * cleaned up our previous buffers by now, so if we are in abort |
| 112 | * mode we can now just skip the rest of the journal write |
| 113 | * entirely. |
| 114 | * |
| 115 | * Returns 1 if the journal needs to be aborted or 0 on success |
| 116 | */ |
| 117 | static int journal_write_commit_record(journal_t *journal, |
| 118 | transaction_t *commit_transaction) |
| 119 | { |
| 120 | struct journal_head *descriptor; |
| 121 | struct buffer_head *bh; |
Jan Kara | 5315217 | 2008-02-01 08:26:46 -0500 | [diff] [blame] | 122 | journal_header_t *header; |
| 123 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | |
| 125 | if (is_journal_aborted(journal)) |
| 126 | return 0; |
| 127 | |
| 128 | descriptor = journal_get_descriptor_buffer(journal); |
| 129 | if (!descriptor) |
| 130 | return 1; |
| 131 | |
| 132 | bh = jh2bh(descriptor); |
| 133 | |
Jan Kara | 5315217 | 2008-02-01 08:26:46 -0500 | [diff] [blame] | 134 | header = (journal_header_t *)(bh->b_data); |
| 135 | header->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER); |
| 136 | header->h_blocktype = cpu_to_be32(JFS_COMMIT_BLOCK); |
| 137 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | |
| 139 | JBUFFER_TRACE(descriptor, "write commit block"); |
| 140 | set_buffer_dirty(bh); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 141 | |
Christoph Hellwig | 4524451 | 2010-08-18 05:29:16 -0400 | [diff] [blame] | 142 | if (journal->j_flags & JFS_BARRIER) |
| 143 | ret = __sync_dirty_buffer(bh, WRITE_SYNC | WRITE_FLUSH_FUA); |
| 144 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | ret = sync_dirty_buffer(bh); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | put_bh(bh); /* One for getblk() */ |
| 148 | journal_put_journal_head(descriptor); |
| 149 | |
| 150 | return (ret == -EIO); |
| 151 | } |
| 152 | |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 153 | static void journal_do_submit_data(struct buffer_head **wbuf, int bufs, |
| 154 | int write_op) |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 155 | { |
| 156 | int i; |
| 157 | |
| 158 | for (i = 0; i < bufs; i++) { |
| 159 | wbuf[i]->b_end_io = end_buffer_write_sync; |
| 160 | /* We use-up our safety reference in submit_bh() */ |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 161 | submit_bh(write_op, wbuf[i]); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 162 | } |
| 163 | } |
| 164 | |
| 165 | /* |
| 166 | * Submit all the data buffers to disk |
| 167 | */ |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 168 | static int journal_submit_data_buffers(journal_t *journal, |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 169 | transaction_t *commit_transaction, |
| 170 | int write_op) |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 171 | { |
| 172 | struct journal_head *jh; |
| 173 | struct buffer_head *bh; |
| 174 | int locked; |
| 175 | int bufs = 0; |
| 176 | struct buffer_head **wbuf = journal->j_wbuf; |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 177 | int err = 0; |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 178 | |
| 179 | /* |
| 180 | * Whenever we unlock the journal and sleep, things can get added |
| 181 | * onto ->t_sync_datalist, so we have to keep looping back to |
| 182 | * write_out_data until we *know* that the list is empty. |
| 183 | * |
| 184 | * Cleanup any flushed data buffers from the data list. Even in |
| 185 | * abort mode, we want to flush this out as soon as possible. |
| 186 | */ |
| 187 | write_out_data: |
| 188 | cond_resched(); |
| 189 | spin_lock(&journal->j_list_lock); |
| 190 | |
| 191 | while (commit_transaction->t_sync_datalist) { |
| 192 | jh = commit_transaction->t_sync_datalist; |
| 193 | bh = jh2bh(jh); |
| 194 | locked = 0; |
| 195 | |
| 196 | /* Get reference just to make sure buffer does not disappear |
| 197 | * when we are forced to drop various locks */ |
| 198 | get_bh(bh); |
| 199 | /* If the buffer is dirty, we need to submit IO and hence |
| 200 | * we need the buffer lock. We try to lock the buffer without |
| 201 | * blocking. If we fail, we need to drop j_list_lock and do |
| 202 | * blocking lock_buffer(). |
| 203 | */ |
| 204 | if (buffer_dirty(bh)) { |
Nick Piggin | ca5de40 | 2008-08-02 12:02:13 +0200 | [diff] [blame] | 205 | if (!trylock_buffer(bh)) { |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 206 | BUFFER_TRACE(bh, "needs blocking lock"); |
| 207 | spin_unlock(&journal->j_list_lock); |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 208 | trace_jbd_do_submit_data(journal, |
| 209 | commit_transaction); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 210 | /* Write out all data to prevent deadlocks */ |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 211 | journal_do_submit_data(wbuf, bufs, write_op); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 212 | bufs = 0; |
| 213 | lock_buffer(bh); |
| 214 | spin_lock(&journal->j_list_lock); |
| 215 | } |
| 216 | locked = 1; |
| 217 | } |
| 218 | /* We have to get bh_state lock. Again out of order, sigh. */ |
| 219 | if (!inverted_lock(journal, bh)) { |
| 220 | jbd_lock_bh_state(bh); |
| 221 | spin_lock(&journal->j_list_lock); |
| 222 | } |
| 223 | /* Someone already cleaned up the buffer? */ |
Jan Kara | a61d90d | 2009-06-09 16:26:26 -0700 | [diff] [blame] | 224 | if (!buffer_jbd(bh) || bh2jh(bh) != jh |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 225 | || jh->b_transaction != commit_transaction |
| 226 | || jh->b_jlist != BJ_SyncData) { |
| 227 | jbd_unlock_bh_state(bh); |
| 228 | if (locked) |
| 229 | unlock_buffer(bh); |
| 230 | BUFFER_TRACE(bh, "already cleaned up"); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 231 | release_data_buffer(bh); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 232 | continue; |
| 233 | } |
| 234 | if (locked && test_clear_buffer_dirty(bh)) { |
| 235 | BUFFER_TRACE(bh, "needs writeout, adding to array"); |
| 236 | wbuf[bufs++] = bh; |
| 237 | __journal_file_buffer(jh, commit_transaction, |
| 238 | BJ_Locked); |
| 239 | jbd_unlock_bh_state(bh); |
| 240 | if (bufs == journal->j_wbufsize) { |
| 241 | spin_unlock(&journal->j_list_lock); |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 242 | trace_jbd_do_submit_data(journal, |
| 243 | commit_transaction); |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 244 | journal_do_submit_data(wbuf, bufs, write_op); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 245 | bufs = 0; |
| 246 | goto write_out_data; |
| 247 | } |
Hisashi Hifumi | 6f5a9da | 2006-12-22 01:11:50 -0800 | [diff] [blame] | 248 | } else if (!locked && buffer_locked(bh)) { |
| 249 | __journal_file_buffer(jh, commit_transaction, |
| 250 | BJ_Locked); |
| 251 | jbd_unlock_bh_state(bh); |
| 252 | put_bh(bh); |
| 253 | } else { |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 254 | BUFFER_TRACE(bh, "writeout complete: unfile"); |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 255 | if (unlikely(!buffer_uptodate(bh))) |
| 256 | err = -EIO; |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 257 | __journal_unfile_buffer(jh); |
| 258 | jbd_unlock_bh_state(bh); |
| 259 | if (locked) |
| 260 | unlock_buffer(bh); |
| 261 | journal_remove_journal_head(bh); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 262 | /* One for our safety reference, other for |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 263 | * journal_remove_journal_head() */ |
| 264 | put_bh(bh); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 265 | release_data_buffer(bh); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 266 | } |
| 267 | |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 268 | if (need_resched() || spin_needbreak(&journal->j_list_lock)) { |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 269 | spin_unlock(&journal->j_list_lock); |
| 270 | goto write_out_data; |
| 271 | } |
| 272 | } |
| 273 | spin_unlock(&journal->j_list_lock); |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 274 | trace_jbd_do_submit_data(journal, commit_transaction); |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 275 | journal_do_submit_data(wbuf, bufs, write_op); |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 276 | |
| 277 | return err; |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 278 | } |
| 279 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | /* |
| 281 | * journal_commit_transaction |
| 282 | * |
| 283 | * The primary function for committing a transaction to the log. This |
| 284 | * function is called by the journal thread to begin a complete commit. |
| 285 | */ |
| 286 | void journal_commit_transaction(journal_t *journal) |
| 287 | { |
| 288 | transaction_t *commit_transaction; |
| 289 | struct journal_head *jh, *new_jh, *descriptor; |
| 290 | struct buffer_head **wbuf = journal->j_wbuf; |
| 291 | int bufs; |
| 292 | int flags; |
| 293 | int err; |
Jan Kara | 9c28cbc | 2009-08-03 19:21:00 +0200 | [diff] [blame] | 294 | unsigned int blocknr; |
Josef Bacik | f420d4d | 2009-01-07 18:07:24 -0800 | [diff] [blame] | 295 | ktime_t start_time; |
| 296 | u64 commit_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | char *tagp = NULL; |
| 298 | journal_header_t *header; |
| 299 | journal_block_tag_t *tag = NULL; |
| 300 | int space_left = 0; |
| 301 | int first_tag = 0; |
| 302 | int tag_flag; |
| 303 | int i; |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 304 | struct blk_plug plug; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | /* |
| 307 | * First job: lock down the current transaction and wait for |
| 308 | * all outstanding updates to complete. |
| 309 | */ |
| 310 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | /* Do we need to erase the effects of a prior journal_flush? */ |
| 312 | if (journal->j_flags & JFS_FLUSHED) { |
| 313 | jbd_debug(3, "super block updated\n"); |
| 314 | journal_update_superblock(journal, 1); |
| 315 | } else { |
| 316 | jbd_debug(3, "superblock not updated\n"); |
| 317 | } |
| 318 | |
| 319 | J_ASSERT(journal->j_running_transaction != NULL); |
| 320 | J_ASSERT(journal->j_committing_transaction == NULL); |
| 321 | |
| 322 | commit_transaction = journal->j_running_transaction; |
| 323 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
| 324 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 325 | trace_jbd_start_commit(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | jbd_debug(1, "JBD: starting commit of transaction %d\n", |
| 327 | commit_transaction->t_tid); |
| 328 | |
| 329 | spin_lock(&journal->j_state_lock); |
| 330 | commit_transaction->t_state = T_LOCKED; |
| 331 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 332 | trace_jbd_commit_locking(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | spin_lock(&commit_transaction->t_handle_lock); |
| 334 | while (commit_transaction->t_updates) { |
| 335 | DEFINE_WAIT(wait); |
| 336 | |
| 337 | prepare_to_wait(&journal->j_wait_updates, &wait, |
| 338 | TASK_UNINTERRUPTIBLE); |
| 339 | if (commit_transaction->t_updates) { |
| 340 | spin_unlock(&commit_transaction->t_handle_lock); |
| 341 | spin_unlock(&journal->j_state_lock); |
| 342 | schedule(); |
| 343 | spin_lock(&journal->j_state_lock); |
| 344 | spin_lock(&commit_transaction->t_handle_lock); |
| 345 | } |
| 346 | finish_wait(&journal->j_wait_updates, &wait); |
| 347 | } |
| 348 | spin_unlock(&commit_transaction->t_handle_lock); |
| 349 | |
| 350 | J_ASSERT (commit_transaction->t_outstanding_credits <= |
| 351 | journal->j_max_transaction_buffers); |
| 352 | |
| 353 | /* |
| 354 | * First thing we are allowed to do is to discard any remaining |
| 355 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume |
| 356 | * that there are no such buffers: if a large filesystem |
| 357 | * operation like a truncate needs to split itself over multiple |
| 358 | * transactions, then it may try to do a journal_restart() while |
| 359 | * there are still BJ_Reserved buffers outstanding. These must |
| 360 | * be released cleanly from the current transaction. |
| 361 | * |
| 362 | * In this case, the filesystem must still reserve write access |
| 363 | * again before modifying the buffer in the new transaction, but |
| 364 | * we do not require it to remember exactly which old buffers it |
| 365 | * has reserved. This is consistent with the existing behaviour |
| 366 | * that multiple journal_get_write_access() calls to the same |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 367 | * buffer are perfectly permissible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | */ |
| 369 | while (commit_transaction->t_reserved_list) { |
| 370 | jh = commit_transaction->t_reserved_list; |
| 371 | JBUFFER_TRACE(jh, "reserved, unused: refile"); |
| 372 | /* |
| 373 | * A journal_get_undo_access()+journal_release_buffer() may |
| 374 | * leave undo-committed data. |
| 375 | */ |
| 376 | if (jh->b_committed_data) { |
| 377 | struct buffer_head *bh = jh2bh(jh); |
| 378 | |
| 379 | jbd_lock_bh_state(bh); |
Mingming Cao | c089d49 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 380 | jbd_free(jh->b_committed_data, bh->b_size); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 381 | jh->b_committed_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | jbd_unlock_bh_state(bh); |
| 383 | } |
| 384 | journal_refile_buffer(journal, jh); |
| 385 | } |
| 386 | |
| 387 | /* |
| 388 | * Now try to drop any written-back buffers from the journal's |
| 389 | * checkpoint lists. We do this *before* commit because it potentially |
| 390 | * frees some memory |
| 391 | */ |
| 392 | spin_lock(&journal->j_list_lock); |
| 393 | __journal_clean_checkpoint_list(journal); |
| 394 | spin_unlock(&journal->j_list_lock); |
| 395 | |
| 396 | jbd_debug (3, "JBD: commit phase 1\n"); |
| 397 | |
| 398 | /* |
| 399 | * Switch to a new revoke table. |
| 400 | */ |
| 401 | journal_switch_revoke_table(journal); |
| 402 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 403 | trace_jbd_commit_flushing(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | commit_transaction->t_state = T_FLUSH; |
| 405 | journal->j_committing_transaction = commit_transaction; |
| 406 | journal->j_running_transaction = NULL; |
Josef Bacik | f420d4d | 2009-01-07 18:07:24 -0800 | [diff] [blame] | 407 | start_time = ktime_get(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | commit_transaction->t_log_start = journal->j_head; |
| 409 | wake_up(&journal->j_wait_transaction_locked); |
| 410 | spin_unlock(&journal->j_state_lock); |
| 411 | |
| 412 | jbd_debug (3, "JBD: commit phase 2\n"); |
| 413 | |
| 414 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | * Now start flushing things to disk, in the order they appear |
| 416 | * on the transaction lists. Data blocks go first. |
| 417 | */ |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 418 | blk_start_plug(&plug); |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 419 | err = journal_submit_data_buffers(journal, commit_transaction, |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 420 | WRITE_SYNC); |
| 421 | blk_finish_plug(&plug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | /* |
| 424 | * Wait for all previously submitted IO to complete. |
| 425 | */ |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 426 | spin_lock(&journal->j_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | while (commit_transaction->t_locked_list) { |
| 428 | struct buffer_head *bh; |
| 429 | |
| 430 | jh = commit_transaction->t_locked_list->b_tprev; |
| 431 | bh = jh2bh(jh); |
| 432 | get_bh(bh); |
| 433 | if (buffer_locked(bh)) { |
| 434 | spin_unlock(&journal->j_list_lock); |
| 435 | wait_on_buffer(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | spin_lock(&journal->j_list_lock); |
| 437 | } |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 438 | if (unlikely(!buffer_uptodate(bh))) { |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 439 | if (!trylock_page(bh->b_page)) { |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 440 | spin_unlock(&journal->j_list_lock); |
| 441 | lock_page(bh->b_page); |
| 442 | spin_lock(&journal->j_list_lock); |
| 443 | } |
| 444 | if (bh->b_page->mapping) |
| 445 | set_bit(AS_EIO, &bh->b_page->mapping->flags); |
| 446 | |
| 447 | unlock_page(bh->b_page); |
| 448 | SetPageError(bh->b_page); |
| 449 | err = -EIO; |
| 450 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | if (!inverted_lock(journal, bh)) { |
| 452 | put_bh(bh); |
| 453 | spin_lock(&journal->j_list_lock); |
| 454 | continue; |
| 455 | } |
Jan Kara | a61d90d | 2009-06-09 16:26:26 -0700 | [diff] [blame] | 456 | if (buffer_jbd(bh) && bh2jh(bh) == jh && |
| 457 | jh->b_transaction == commit_transaction && |
| 458 | jh->b_jlist == BJ_Locked) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | __journal_unfile_buffer(jh); |
| 460 | jbd_unlock_bh_state(bh); |
| 461 | journal_remove_journal_head(bh); |
| 462 | put_bh(bh); |
| 463 | } else { |
| 464 | jbd_unlock_bh_state(bh); |
| 465 | } |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 466 | release_data_buffer(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | cond_resched_lock(&journal->j_list_lock); |
| 468 | } |
| 469 | spin_unlock(&journal->j_list_lock); |
| 470 | |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 471 | if (err) { |
| 472 | char b[BDEVNAME_SIZE]; |
| 473 | |
| 474 | printk(KERN_WARNING |
| 475 | "JBD: Detected IO errors while flushing file data " |
| 476 | "on %s\n", bdevname(journal->j_fs_dev, b)); |
Hidehiro Kawai | 0e4fb5e | 2008-10-18 20:27:57 -0700 | [diff] [blame] | 477 | if (journal->j_flags & JFS_ABORT_ON_SYNCDATA_ERR) |
| 478 | journal_abort(journal, err); |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 479 | err = 0; |
| 480 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 482 | blk_start_plug(&plug); |
| 483 | |
| 484 | journal_write_revoke_records(journal, commit_transaction, WRITE_SYNC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | /* |
| 487 | * If we found any dirty or locked buffers, then we should have |
| 488 | * looped back up to the write_out_data label. If there weren't |
| 489 | * any then journal_clean_data_list should have wiped the list |
| 490 | * clean by now, so check that it is in fact empty. |
| 491 | */ |
| 492 | J_ASSERT (commit_transaction->t_sync_datalist == NULL); |
| 493 | |
| 494 | jbd_debug (3, "JBD: commit phase 3\n"); |
| 495 | |
| 496 | /* |
| 497 | * Way to go: we have now written out all of the data for a |
| 498 | * transaction! Now comes the tricky part: we need to write out |
| 499 | * metadata. Loop over the transaction's entire buffer list: |
| 500 | */ |
Mingming Cao | 772279c | 2008-05-14 16:05:41 -0700 | [diff] [blame] | 501 | spin_lock(&journal->j_state_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | commit_transaction->t_state = T_COMMIT; |
Mingming Cao | 772279c | 2008-05-14 16:05:41 -0700 | [diff] [blame] | 503 | spin_unlock(&journal->j_state_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 505 | trace_jbd_commit_logging(journal, commit_transaction); |
Josef Bacik | 5b9a499 | 2008-04-28 02:16:12 -0700 | [diff] [blame] | 506 | J_ASSERT(commit_transaction->t_nr_buffers <= |
| 507 | commit_transaction->t_outstanding_credits); |
| 508 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | descriptor = NULL; |
| 510 | bufs = 0; |
| 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 | 885e353 | 2008-10-18 20:27:54 -0700 | [diff] [blame] | 518 | release it. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
| 520 | if (is_journal_aborted(journal)) { |
Hidehiro Kawai | 885e353 | 2008-10-18 20:27:54 -0700 | [diff] [blame] | 521 | clear_buffer_jbddirty(jh2bh(jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 522 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
| 523 | journal_refile_buffer(journal, jh); |
| 524 | /* If that was the last one, we need to clean up |
| 525 | * any descriptor buffers which may have been |
| 526 | * already allocated, even if we are now |
| 527 | * aborting. */ |
| 528 | if (!commit_transaction->t_buffers) |
| 529 | goto start_journal_io; |
| 530 | continue; |
| 531 | } |
| 532 | |
| 533 | /* Make sure we have a descriptor block in which to |
| 534 | record the metadata buffer. */ |
| 535 | |
| 536 | if (!descriptor) { |
| 537 | struct buffer_head *bh; |
| 538 | |
| 539 | J_ASSERT (bufs == 0); |
| 540 | |
| 541 | jbd_debug(4, "JBD: get descriptor\n"); |
| 542 | |
| 543 | descriptor = journal_get_descriptor_buffer(journal); |
| 544 | if (!descriptor) { |
Jan Kara | 7a266e7 | 2007-10-18 23:39:22 -0700 | [diff] [blame] | 545 | journal_abort(journal, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | continue; |
| 547 | } |
| 548 | |
| 549 | bh = jh2bh(descriptor); |
| 550 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", |
| 551 | (unsigned long long)bh->b_blocknr, bh->b_data); |
| 552 | header = (journal_header_t *)&bh->b_data[0]; |
| 553 | header->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER); |
| 554 | header->h_blocktype = cpu_to_be32(JFS_DESCRIPTOR_BLOCK); |
| 555 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
| 556 | |
| 557 | tagp = &bh->b_data[sizeof(journal_header_t)]; |
| 558 | space_left = bh->b_size - sizeof(journal_header_t); |
| 559 | first_tag = 1; |
| 560 | set_buffer_jwrite(bh); |
| 561 | set_buffer_dirty(bh); |
| 562 | wbuf[bufs++] = bh; |
| 563 | |
| 564 | /* Record it so that we can wait for IO |
| 565 | completion later */ |
| 566 | BUFFER_TRACE(bh, "ph3: file as descriptor"); |
| 567 | journal_file_buffer(descriptor, commit_transaction, |
| 568 | BJ_LogCtl); |
| 569 | } |
| 570 | |
| 571 | /* Where is the buffer to be written? */ |
| 572 | |
| 573 | err = journal_next_log_block(journal, &blocknr); |
| 574 | /* If the block mapping failed, just abandon the buffer |
| 575 | and repeat this loop: we'll fall into the |
| 576 | refile-on-abort condition above. */ |
| 577 | if (err) { |
Jan Kara | 7a266e7 | 2007-10-18 23:39:22 -0700 | [diff] [blame] | 578 | journal_abort(journal, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | continue; |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * start_this_handle() uses t_outstanding_credits to determine |
| 584 | * the free space in the log, but this counter is changed |
| 585 | * by journal_next_log_block() also. |
| 586 | */ |
| 587 | commit_transaction->t_outstanding_credits--; |
| 588 | |
| 589 | /* Bump b_count to prevent truncate from stumbling over |
| 590 | the shadowed buffer! @@@ This can go if we ever get |
| 591 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ |
Namhyung Kim | e4d5e3a | 2010-10-16 17:11:02 +0900 | [diff] [blame] | 592 | get_bh(jh2bh(jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | |
| 594 | /* Make a temporary IO buffer with which to write it out |
| 595 | (this will requeue both the metadata buffer and the |
| 596 | temporary IO buffer). new_bh goes on BJ_IO*/ |
| 597 | |
Namhyung Kim | a910eef | 2010-10-08 20:05:06 +0900 | [diff] [blame] | 598 | set_buffer_jwrite(jh2bh(jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | /* |
| 600 | * akpm: journal_write_metadata_buffer() sets |
| 601 | * new_bh->b_transaction to commit_transaction. |
| 602 | * We need to clean this up before we release new_bh |
| 603 | * (which is of type BJ_IO) |
| 604 | */ |
| 605 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
| 606 | flags = journal_write_metadata_buffer(commit_transaction, |
| 607 | jh, &new_jh, blocknr); |
Namhyung Kim | a910eef | 2010-10-08 20:05:06 +0900 | [diff] [blame] | 608 | set_buffer_jwrite(jh2bh(new_jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | wbuf[bufs++] = jh2bh(new_jh); |
| 610 | |
| 611 | /* Record the new block's tag in the current descriptor |
| 612 | buffer */ |
| 613 | |
| 614 | tag_flag = 0; |
| 615 | if (flags & 1) |
| 616 | tag_flag |= JFS_FLAG_ESCAPE; |
| 617 | if (!first_tag) |
| 618 | tag_flag |= JFS_FLAG_SAME_UUID; |
| 619 | |
| 620 | tag = (journal_block_tag_t *) tagp; |
| 621 | tag->t_blocknr = cpu_to_be32(jh2bh(jh)->b_blocknr); |
| 622 | tag->t_flags = cpu_to_be32(tag_flag); |
| 623 | tagp += sizeof(journal_block_tag_t); |
| 624 | space_left -= sizeof(journal_block_tag_t); |
| 625 | |
| 626 | if (first_tag) { |
| 627 | memcpy (tagp, journal->j_uuid, 16); |
| 628 | tagp += 16; |
| 629 | space_left -= 16; |
| 630 | first_tag = 0; |
| 631 | } |
| 632 | |
| 633 | /* If there's no more to do, or if the descriptor is full, |
| 634 | let the IO rip! */ |
| 635 | |
| 636 | if (bufs == journal->j_wbufsize || |
| 637 | commit_transaction->t_buffers == NULL || |
| 638 | space_left < sizeof(journal_block_tag_t) + 16) { |
| 639 | |
| 640 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); |
| 641 | |
| 642 | /* Write an end-of-descriptor marker before |
| 643 | submitting the IOs. "tag" still points to |
| 644 | the last tag we set up. */ |
| 645 | |
| 646 | tag->t_flags |= cpu_to_be32(JFS_FLAG_LAST_TAG); |
| 647 | |
| 648 | start_journal_io: |
| 649 | for (i = 0; i < bufs; i++) { |
| 650 | struct buffer_head *bh = wbuf[i]; |
| 651 | lock_buffer(bh); |
| 652 | clear_buffer_dirty(bh); |
| 653 | set_buffer_uptodate(bh); |
| 654 | bh->b_end_io = journal_end_buffer_io_sync; |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 655 | submit_bh(WRITE_SYNC, bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | } |
| 657 | cond_resched(); |
| 658 | |
| 659 | /* Force a new descriptor to be generated next |
| 660 | time round the loop. */ |
| 661 | descriptor = NULL; |
| 662 | bufs = 0; |
| 663 | } |
| 664 | } |
| 665 | |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 666 | blk_finish_plug(&plug); |
| 667 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | /* Lo and behold: we have just managed to send a transaction to |
| 669 | the log. Before we can commit it, wait for the IO so far to |
| 670 | complete. Control buffers being written are on the |
| 671 | transaction's t_log_list queue, and metadata buffers are on |
| 672 | the t_iobuf_list queue. |
| 673 | |
| 674 | Wait for the buffers in reverse order. That way we are |
| 675 | less likely to be woken up until all IOs have completed, and |
| 676 | so we incur less scheduling load. |
| 677 | */ |
| 678 | |
| 679 | jbd_debug(3, "JBD: commit phase 4\n"); |
| 680 | |
| 681 | /* |
| 682 | * akpm: these are BJ_IO, and j_list_lock is not needed. |
| 683 | * See __journal_try_to_free_buffer. |
| 684 | */ |
| 685 | wait_for_iobuf: |
| 686 | while (commit_transaction->t_iobuf_list != NULL) { |
| 687 | struct buffer_head *bh; |
| 688 | |
| 689 | jh = commit_transaction->t_iobuf_list->b_tprev; |
| 690 | bh = jh2bh(jh); |
| 691 | if (buffer_locked(bh)) { |
| 692 | wait_on_buffer(bh); |
| 693 | goto wait_for_iobuf; |
| 694 | } |
| 695 | if (cond_resched()) |
| 696 | goto wait_for_iobuf; |
| 697 | |
| 698 | if (unlikely(!buffer_uptodate(bh))) |
| 699 | err = -EIO; |
| 700 | |
| 701 | clear_buffer_jwrite(bh); |
| 702 | |
| 703 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); |
| 704 | journal_unfile_buffer(journal, jh); |
| 705 | |
| 706 | /* |
| 707 | * ->t_iobuf_list should contain only dummy buffer_heads |
| 708 | * which were created by journal_write_metadata_buffer(). |
| 709 | */ |
| 710 | BUFFER_TRACE(bh, "dumping temporary bh"); |
| 711 | journal_put_journal_head(jh); |
| 712 | __brelse(bh); |
| 713 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); |
| 714 | free_buffer_head(bh); |
| 715 | |
| 716 | /* We also have to unlock and free the corresponding |
| 717 | shadowed buffer */ |
| 718 | jh = commit_transaction->t_shadow_list->b_tprev; |
| 719 | bh = jh2bh(jh); |
Namhyung Kim | a910eef | 2010-10-08 20:05:06 +0900 | [diff] [blame] | 720 | clear_buffer_jwrite(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
| 722 | |
| 723 | /* The metadata is now released for reuse, but we need |
| 724 | to remember it against this transaction so that when |
| 725 | we finally commit, we can do any checkpointing |
| 726 | required. */ |
| 727 | JBUFFER_TRACE(jh, "file as BJ_Forget"); |
| 728 | journal_file_buffer(jh, commit_transaction, BJ_Forget); |
Jan Kara | 2842bb2 | 2011-05-05 13:59:35 +0200 | [diff] [blame] | 729 | /* |
| 730 | * Wake up any transactions which were waiting for this |
| 731 | * IO to complete. The barrier must be here so that changes |
| 732 | * by journal_file_buffer() take effect before wake_up_bit() |
| 733 | * does the waitqueue check. |
| 734 | */ |
| 735 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | wake_up_bit(&bh->b_state, BH_Unshadow); |
| 737 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
| 738 | __brelse(bh); |
| 739 | } |
| 740 | |
| 741 | J_ASSERT (commit_transaction->t_shadow_list == NULL); |
| 742 | |
| 743 | jbd_debug(3, "JBD: commit phase 5\n"); |
| 744 | |
| 745 | /* Here we wait for the revoke record and descriptor record buffers */ |
| 746 | wait_for_ctlbuf: |
| 747 | while (commit_transaction->t_log_list != NULL) { |
| 748 | struct buffer_head *bh; |
| 749 | |
| 750 | jh = commit_transaction->t_log_list->b_tprev; |
| 751 | bh = jh2bh(jh); |
| 752 | if (buffer_locked(bh)) { |
| 753 | wait_on_buffer(bh); |
| 754 | goto wait_for_ctlbuf; |
| 755 | } |
| 756 | if (cond_resched()) |
| 757 | goto wait_for_ctlbuf; |
| 758 | |
| 759 | if (unlikely(!buffer_uptodate(bh))) |
| 760 | err = -EIO; |
| 761 | |
| 762 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); |
| 763 | clear_buffer_jwrite(bh); |
| 764 | journal_unfile_buffer(journal, jh); |
| 765 | journal_put_journal_head(jh); |
| 766 | __brelse(bh); /* One for getblk */ |
| 767 | /* AKPM: bforget here */ |
| 768 | } |
| 769 | |
Hidehiro Kawai | d1645e5 | 2008-10-18 20:27:53 -0700 | [diff] [blame] | 770 | if (err) |
| 771 | journal_abort(journal, err); |
| 772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | jbd_debug(3, "JBD: commit phase 6\n"); |
| 774 | |
Jan Kara | 03f4d80 | 2010-04-15 22:16:24 +0200 | [diff] [blame] | 775 | /* All metadata is written, now write commit record and do cleanup */ |
| 776 | spin_lock(&journal->j_state_lock); |
| 777 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
| 778 | commit_transaction->t_state = T_COMMIT_RECORD; |
| 779 | spin_unlock(&journal->j_state_lock); |
| 780 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | if (journal_write_commit_record(journal, commit_transaction)) |
| 782 | err = -EIO; |
| 783 | |
| 784 | if (err) |
Jan Kara | 7a266e7 | 2007-10-18 23:39:22 -0700 | [diff] [blame] | 785 | journal_abort(journal, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | |
| 787 | /* End of a transaction! Finally, we can do checkpoint |
| 788 | processing: any buffers committed as a result of this |
| 789 | transaction can be removed from any checkpoint list it was on |
| 790 | before. */ |
| 791 | |
| 792 | jbd_debug(3, "JBD: commit phase 7\n"); |
| 793 | |
| 794 | J_ASSERT(commit_transaction->t_sync_datalist == NULL); |
| 795 | J_ASSERT(commit_transaction->t_buffers == NULL); |
| 796 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); |
| 797 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); |
| 798 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
| 799 | J_ASSERT(commit_transaction->t_log_list == NULL); |
| 800 | |
| 801 | restart_loop: |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 802 | /* |
| 803 | * As there are other places (journal_unmap_buffer()) adding buffers |
| 804 | * to this list we have to be careful and hold the j_list_lock. |
| 805 | */ |
| 806 | spin_lock(&journal->j_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | while (commit_transaction->t_forget) { |
| 808 | transaction_t *cp_transaction; |
| 809 | struct buffer_head *bh; |
| 810 | |
| 811 | jh = commit_transaction->t_forget; |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 812 | spin_unlock(&journal->j_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | bh = jh2bh(jh); |
| 814 | jbd_lock_bh_state(bh); |
| 815 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction || |
| 816 | jh->b_transaction == journal->j_running_transaction); |
| 817 | |
| 818 | /* |
| 819 | * If there is undo-protected committed data against |
| 820 | * this buffer, then we can remove it now. If it is a |
| 821 | * buffer needing such protection, the old frozen_data |
| 822 | * field now points to a committed version of the |
| 823 | * buffer, so rotate that field to the new committed |
| 824 | * data. |
| 825 | * |
| 826 | * Otherwise, we can just throw away the frozen data now. |
| 827 | */ |
| 828 | if (jh->b_committed_data) { |
Mingming Cao | c089d49 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 829 | jbd_free(jh->b_committed_data, bh->b_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | jh->b_committed_data = NULL; |
| 831 | if (jh->b_frozen_data) { |
| 832 | jh->b_committed_data = jh->b_frozen_data; |
| 833 | jh->b_frozen_data = NULL; |
| 834 | } |
| 835 | } else if (jh->b_frozen_data) { |
Mingming Cao | c089d49 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 836 | jbd_free(jh->b_frozen_data, bh->b_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | jh->b_frozen_data = NULL; |
| 838 | } |
| 839 | |
| 840 | spin_lock(&journal->j_list_lock); |
| 841 | cp_transaction = jh->b_cp_transaction; |
| 842 | if (cp_transaction) { |
| 843 | JBUFFER_TRACE(jh, "remove from old cp transaction"); |
| 844 | __journal_remove_checkpoint(jh); |
| 845 | } |
| 846 | |
| 847 | /* Only re-checkpoint the buffer_head if it is marked |
| 848 | * dirty. If the buffer was added to the BJ_Forget list |
| 849 | * by journal_forget, it may no longer be dirty and |
| 850 | * there's no point in keeping a checkpoint record for |
| 851 | * it. */ |
| 852 | |
| 853 | /* A buffer which has been freed while still being |
| 854 | * journaled by a previous transaction may end up still |
| 855 | * being dirty here, but we want to avoid writing back |
Jan Kara | 8696391 | 2010-02-16 20:37:12 +0100 | [diff] [blame] | 856 | * that buffer in the future after the "add to orphan" |
| 857 | * operation been committed, That's not only a performance |
| 858 | * gain, it also stops aliasing problems if the buffer is |
| 859 | * left behind for writeback and gets reallocated for another |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | * use in a different page. */ |
Jan Kara | 8696391 | 2010-02-16 20:37:12 +0100 | [diff] [blame] | 861 | if (buffer_freed(bh) && !jh->b_next_transaction) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | clear_buffer_freed(bh); |
| 863 | clear_buffer_jbddirty(bh); |
| 864 | } |
| 865 | |
| 866 | if (buffer_jbddirty(bh)) { |
| 867 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); |
| 868 | __journal_insert_checkpoint(jh, commit_transaction); |
Hidehiro Kawai | 885e353 | 2008-10-18 20:27:54 -0700 | [diff] [blame] | 869 | if (is_journal_aborted(journal)) |
| 870 | clear_buffer_jbddirty(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 871 | JBUFFER_TRACE(jh, "refile for checkpoint writeback"); |
| 872 | __journal_refile_buffer(jh); |
| 873 | jbd_unlock_bh_state(bh); |
| 874 | } else { |
| 875 | J_ASSERT_BH(bh, !buffer_dirty(bh)); |
Jan Kara | 9ada734 | 2006-06-23 02:05:25 -0700 | [diff] [blame] | 876 | /* The buffer on BJ_Forget list and not jbddirty means |
| 877 | * it has been freed by this transaction and hence it |
| 878 | * could not have been reallocated until this |
| 879 | * transaction has committed. *BUT* it could be |
| 880 | * reallocated once we have written all the data to |
| 881 | * disk and before we process the buffer on BJ_Forget |
| 882 | * list. */ |
| 883 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); |
| 884 | __journal_refile_buffer(jh); |
| 885 | if (!jh->b_transaction) { |
| 886 | jbd_unlock_bh_state(bh); |
| 887 | /* needs a brelse */ |
| 888 | journal_remove_journal_head(bh); |
| 889 | release_buffer_page(bh); |
| 890 | } else |
| 891 | jbd_unlock_bh_state(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | } |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 893 | cond_resched_lock(&journal->j_list_lock); |
| 894 | } |
| 895 | spin_unlock(&journal->j_list_lock); |
| 896 | /* |
Jan Kara | d4beaf4 | 2007-12-04 23:45:27 -0800 | [diff] [blame] | 897 | * This is a bit sleazy. We use j_list_lock to protect transition |
| 898 | * of a transaction into T_FINISHED state and calling |
| 899 | * __journal_drop_transaction(). Otherwise we could race with |
| 900 | * other checkpointing code processing the transaction... |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 901 | */ |
| 902 | spin_lock(&journal->j_state_lock); |
| 903 | spin_lock(&journal->j_list_lock); |
| 904 | /* |
| 905 | * Now recheck if some buffers did not get attached to the transaction |
| 906 | * while the lock was dropped... |
| 907 | */ |
| 908 | if (commit_transaction->t_forget) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | spin_unlock(&journal->j_list_lock); |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 910 | spin_unlock(&journal->j_state_lock); |
| 911 | goto restart_loop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | } |
| 913 | |
| 914 | /* Done with this transaction! */ |
| 915 | |
| 916 | jbd_debug(3, "JBD: commit phase 8\n"); |
| 917 | |
Jan Kara | 03f4d80 | 2010-04-15 22:16:24 +0200 | [diff] [blame] | 918 | J_ASSERT(commit_transaction->t_state == T_COMMIT_RECORD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | commit_transaction->t_state = T_FINISHED; |
| 921 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
| 922 | journal->j_commit_sequence = commit_transaction->t_tid; |
| 923 | journal->j_committing_transaction = NULL; |
Josef Bacik | f420d4d | 2009-01-07 18:07:24 -0800 | [diff] [blame] | 924 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
| 925 | |
| 926 | /* |
| 927 | * weight the commit time higher than the average time so we don't |
| 928 | * react too strongly to vast changes in commit time |
| 929 | */ |
| 930 | if (likely(journal->j_average_commit_time)) |
| 931 | journal->j_average_commit_time = (commit_time*3 + |
| 932 | journal->j_average_commit_time) / 4; |
| 933 | else |
| 934 | journal->j_average_commit_time = commit_time; |
| 935 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | spin_unlock(&journal->j_state_lock); |
| 937 | |
Jan Kara | fe28e42 | 2007-07-15 23:37:18 -0700 | [diff] [blame] | 938 | if (commit_transaction->t_checkpoint_list == NULL && |
| 939 | commit_transaction->t_checkpoint_io_list == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 940 | __journal_drop_transaction(journal, commit_transaction); |
| 941 | } else { |
| 942 | if (journal->j_checkpoint_transactions == NULL) { |
| 943 | journal->j_checkpoint_transactions = commit_transaction; |
| 944 | commit_transaction->t_cpnext = commit_transaction; |
| 945 | commit_transaction->t_cpprev = commit_transaction; |
| 946 | } else { |
| 947 | commit_transaction->t_cpnext = |
| 948 | journal->j_checkpoint_transactions; |
| 949 | commit_transaction->t_cpprev = |
| 950 | commit_transaction->t_cpnext->t_cpprev; |
| 951 | commit_transaction->t_cpnext->t_cpprev = |
| 952 | commit_transaction; |
| 953 | commit_transaction->t_cpprev->t_cpnext = |
| 954 | commit_transaction; |
| 955 | } |
| 956 | } |
| 957 | spin_unlock(&journal->j_list_lock); |
| 958 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 959 | trace_jbd_end_commit(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
| 961 | journal->j_commit_sequence, journal->j_tail_sequence); |
| 962 | |
| 963 | wake_up(&journal->j_wait_done_commit); |
| 964 | } |