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)) { |
Jan Kara | 09e05d4 | 2012-07-11 23:16:25 +0200 | [diff] [blame] | 89 | WARN_ON_ONCE(buffer_dirty(bh)); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 90 | clear_buffer_freed(bh); |
Jan Kara | 09e05d4 | 2012-07-11 23:16:25 +0200 | [diff] [blame] | 91 | clear_buffer_mapped(bh); |
| 92 | clear_buffer_new(bh); |
| 93 | clear_buffer_req(bh); |
| 94 | bh->b_bdev = NULL; |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 95 | release_buffer_page(bh); |
| 96 | } else |
| 97 | put_bh(bh); |
| 98 | } |
| 99 | |
| 100 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | * Try to acquire jbd_lock_bh_state() against the buffer, when j_list_lock is |
| 102 | * held. For ranking reasons we must trylock. If we lose, schedule away and |
| 103 | * return 0. j_list_lock is dropped in this case. |
| 104 | */ |
| 105 | static int inverted_lock(journal_t *journal, struct buffer_head *bh) |
| 106 | { |
| 107 | if (!jbd_trylock_bh_state(bh)) { |
| 108 | spin_unlock(&journal->j_list_lock); |
| 109 | schedule(); |
| 110 | return 0; |
| 111 | } |
| 112 | return 1; |
| 113 | } |
| 114 | |
| 115 | /* Done it all: now write the commit record. We should have |
| 116 | * cleaned up our previous buffers by now, so if we are in abort |
| 117 | * mode we can now just skip the rest of the journal write |
| 118 | * entirely. |
| 119 | * |
| 120 | * Returns 1 if the journal needs to be aborted or 0 on success |
| 121 | */ |
| 122 | static int journal_write_commit_record(journal_t *journal, |
| 123 | transaction_t *commit_transaction) |
| 124 | { |
| 125 | struct journal_head *descriptor; |
| 126 | struct buffer_head *bh; |
Jan Kara | 5315217 | 2008-02-01 08:26:46 -0500 | [diff] [blame] | 127 | journal_header_t *header; |
| 128 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
| 130 | if (is_journal_aborted(journal)) |
| 131 | return 0; |
| 132 | |
| 133 | descriptor = journal_get_descriptor_buffer(journal); |
| 134 | if (!descriptor) |
| 135 | return 1; |
| 136 | |
| 137 | bh = jh2bh(descriptor); |
| 138 | |
Jan Kara | 5315217 | 2008-02-01 08:26:46 -0500 | [diff] [blame] | 139 | header = (journal_header_t *)(bh->b_data); |
| 140 | header->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER); |
| 141 | header->h_blocktype = cpu_to_be32(JFS_COMMIT_BLOCK); |
| 142 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | JBUFFER_TRACE(descriptor, "write commit block"); |
| 145 | set_buffer_dirty(bh); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 146 | |
Christoph Hellwig | 4524451 | 2010-08-18 05:29:16 -0400 | [diff] [blame] | 147 | if (journal->j_flags & JFS_BARRIER) |
| 148 | ret = __sync_dirty_buffer(bh, WRITE_SYNC | WRITE_FLUSH_FUA); |
| 149 | else |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | ret = sync_dirty_buffer(bh); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 151 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | put_bh(bh); /* One for getblk() */ |
| 153 | journal_put_journal_head(descriptor); |
| 154 | |
| 155 | return (ret == -EIO); |
| 156 | } |
| 157 | |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 158 | static void journal_do_submit_data(struct buffer_head **wbuf, int bufs, |
| 159 | int write_op) |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 160 | { |
| 161 | int i; |
| 162 | |
| 163 | for (i = 0; i < bufs; i++) { |
| 164 | wbuf[i]->b_end_io = end_buffer_write_sync; |
Darrick J. Wong | 713685111 | 2013-04-29 15:07:25 -0700 | [diff] [blame] | 165 | /* |
| 166 | * Here we write back pagecache data that may be mmaped. Since |
| 167 | * we cannot afford to clean the page and set PageWriteback |
| 168 | * here due to lock ordering (page lock ranks above transaction |
| 169 | * start), the data can change while IO is in flight. Tell the |
| 170 | * block layer it should bounce the bio pages if stable data |
| 171 | * during write is required. |
| 172 | * |
| 173 | * We use up our safety reference in submit_bh(). |
| 174 | */ |
| 175 | _submit_bh(write_op, wbuf[i], 1 << BIO_SNAP_STABLE); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 176 | } |
| 177 | } |
| 178 | |
| 179 | /* |
| 180 | * Submit all the data buffers to disk |
| 181 | */ |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 182 | static int journal_submit_data_buffers(journal_t *journal, |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 183 | transaction_t *commit_transaction, |
| 184 | int write_op) |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 185 | { |
| 186 | struct journal_head *jh; |
| 187 | struct buffer_head *bh; |
| 188 | int locked; |
| 189 | int bufs = 0; |
| 190 | struct buffer_head **wbuf = journal->j_wbuf; |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 191 | int err = 0; |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 192 | |
| 193 | /* |
| 194 | * Whenever we unlock the journal and sleep, things can get added |
| 195 | * onto ->t_sync_datalist, so we have to keep looping back to |
| 196 | * write_out_data until we *know* that the list is empty. |
| 197 | * |
| 198 | * Cleanup any flushed data buffers from the data list. Even in |
| 199 | * abort mode, we want to flush this out as soon as possible. |
| 200 | */ |
| 201 | write_out_data: |
| 202 | cond_resched(); |
| 203 | spin_lock(&journal->j_list_lock); |
| 204 | |
| 205 | while (commit_transaction->t_sync_datalist) { |
| 206 | jh = commit_transaction->t_sync_datalist; |
| 207 | bh = jh2bh(jh); |
| 208 | locked = 0; |
| 209 | |
| 210 | /* Get reference just to make sure buffer does not disappear |
| 211 | * when we are forced to drop various locks */ |
| 212 | get_bh(bh); |
| 213 | /* If the buffer is dirty, we need to submit IO and hence |
| 214 | * we need the buffer lock. We try to lock the buffer without |
| 215 | * blocking. If we fail, we need to drop j_list_lock and do |
| 216 | * blocking lock_buffer(). |
| 217 | */ |
| 218 | if (buffer_dirty(bh)) { |
Nick Piggin | ca5de40 | 2008-08-02 12:02:13 +0200 | [diff] [blame] | 219 | if (!trylock_buffer(bh)) { |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 220 | BUFFER_TRACE(bh, "needs blocking lock"); |
| 221 | spin_unlock(&journal->j_list_lock); |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 222 | trace_jbd_do_submit_data(journal, |
| 223 | commit_transaction); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 224 | /* Write out all data to prevent deadlocks */ |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 225 | journal_do_submit_data(wbuf, bufs, write_op); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 226 | bufs = 0; |
| 227 | lock_buffer(bh); |
| 228 | spin_lock(&journal->j_list_lock); |
| 229 | } |
| 230 | locked = 1; |
| 231 | } |
| 232 | /* We have to get bh_state lock. Again out of order, sigh. */ |
| 233 | if (!inverted_lock(journal, bh)) { |
| 234 | jbd_lock_bh_state(bh); |
| 235 | spin_lock(&journal->j_list_lock); |
| 236 | } |
| 237 | /* Someone already cleaned up the buffer? */ |
Jan Kara | a61d90d | 2009-06-09 16:26:26 -0700 | [diff] [blame] | 238 | if (!buffer_jbd(bh) || bh2jh(bh) != jh |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 239 | || jh->b_transaction != commit_transaction |
| 240 | || jh->b_jlist != BJ_SyncData) { |
| 241 | jbd_unlock_bh_state(bh); |
| 242 | if (locked) |
| 243 | unlock_buffer(bh); |
| 244 | BUFFER_TRACE(bh, "already cleaned up"); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 245 | release_data_buffer(bh); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 246 | continue; |
| 247 | } |
| 248 | if (locked && test_clear_buffer_dirty(bh)) { |
| 249 | BUFFER_TRACE(bh, "needs writeout, adding to array"); |
| 250 | wbuf[bufs++] = bh; |
| 251 | __journal_file_buffer(jh, commit_transaction, |
| 252 | BJ_Locked); |
| 253 | jbd_unlock_bh_state(bh); |
| 254 | if (bufs == journal->j_wbufsize) { |
| 255 | spin_unlock(&journal->j_list_lock); |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 256 | trace_jbd_do_submit_data(journal, |
| 257 | commit_transaction); |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 258 | journal_do_submit_data(wbuf, bufs, write_op); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 259 | bufs = 0; |
| 260 | goto write_out_data; |
| 261 | } |
Hisashi Hifumi | 6f5a9da | 2006-12-22 01:11:50 -0800 | [diff] [blame] | 262 | } else if (!locked && buffer_locked(bh)) { |
| 263 | __journal_file_buffer(jh, commit_transaction, |
| 264 | BJ_Locked); |
| 265 | jbd_unlock_bh_state(bh); |
| 266 | put_bh(bh); |
| 267 | } else { |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 268 | BUFFER_TRACE(bh, "writeout complete: unfile"); |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 269 | if (unlikely(!buffer_uptodate(bh))) |
| 270 | err = -EIO; |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 271 | __journal_unfile_buffer(jh); |
| 272 | jbd_unlock_bh_state(bh); |
| 273 | if (locked) |
| 274 | unlock_buffer(bh); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 275 | release_data_buffer(bh); |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 276 | } |
| 277 | |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 278 | if (need_resched() || spin_needbreak(&journal->j_list_lock)) { |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 279 | spin_unlock(&journal->j_list_lock); |
| 280 | goto write_out_data; |
| 281 | } |
| 282 | } |
| 283 | spin_unlock(&journal->j_list_lock); |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 284 | trace_jbd_do_submit_data(journal, commit_transaction); |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 285 | journal_do_submit_data(wbuf, bufs, write_op); |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 286 | |
| 287 | return err; |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | /* |
| 291 | * journal_commit_transaction |
| 292 | * |
| 293 | * The primary function for committing a transaction to the log. This |
| 294 | * function is called by the journal thread to begin a complete commit. |
| 295 | */ |
| 296 | void journal_commit_transaction(journal_t *journal) |
| 297 | { |
| 298 | transaction_t *commit_transaction; |
| 299 | struct journal_head *jh, *new_jh, *descriptor; |
| 300 | struct buffer_head **wbuf = journal->j_wbuf; |
| 301 | int bufs; |
| 302 | int flags; |
| 303 | int err; |
Jan Kara | 9c28cbc | 2009-08-03 19:21:00 +0200 | [diff] [blame] | 304 | unsigned int blocknr; |
Josef Bacik | f420d4d | 2009-01-07 18:07:24 -0800 | [diff] [blame] | 305 | ktime_t start_time; |
| 306 | u64 commit_time; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | char *tagp = NULL; |
| 308 | journal_header_t *header; |
| 309 | journal_block_tag_t *tag = NULL; |
| 310 | int space_left = 0; |
| 311 | int first_tag = 0; |
| 312 | int tag_flag; |
| 313 | int i; |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 314 | struct blk_plug plug; |
Jan Kara | 2db938b | 2011-02-21 17:25:37 +0100 | [diff] [blame] | 315 | int write_op = WRITE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | |
| 317 | /* |
| 318 | * First job: lock down the current transaction and wait for |
| 319 | * all outstanding updates to complete. |
| 320 | */ |
| 321 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | /* Do we need to erase the effects of a prior journal_flush? */ |
| 323 | if (journal->j_flags & JFS_FLUSHED) { |
| 324 | jbd_debug(3, "super block updated\n"); |
Jan Kara | 1ce8486 | 2012-04-07 12:50:13 +0200 | [diff] [blame] | 325 | mutex_lock(&journal->j_checkpoint_mutex); |
Jan Kara | fd2cbd4 | 2012-04-07 11:05:19 +0200 | [diff] [blame] | 326 | /* |
| 327 | * We hold j_checkpoint_mutex so tail cannot change under us. |
| 328 | * We don't need any special data guarantees for writing sb |
| 329 | * since journal is empty and it is ok for write to be |
| 330 | * flushed only with transaction commit. |
| 331 | */ |
| 332 | journal_update_sb_log_tail(journal, journal->j_tail_sequence, |
| 333 | journal->j_tail, WRITE_SYNC); |
Jan Kara | 1ce8486 | 2012-04-07 12:50:13 +0200 | [diff] [blame] | 334 | mutex_unlock(&journal->j_checkpoint_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | } else { |
| 336 | jbd_debug(3, "superblock not updated\n"); |
| 337 | } |
| 338 | |
| 339 | J_ASSERT(journal->j_running_transaction != NULL); |
| 340 | J_ASSERT(journal->j_committing_transaction == NULL); |
| 341 | |
| 342 | commit_transaction = journal->j_running_transaction; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 344 | trace_jbd_start_commit(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | jbd_debug(1, "JBD: starting commit of transaction %d\n", |
| 346 | commit_transaction->t_tid); |
| 347 | |
| 348 | spin_lock(&journal->j_state_lock); |
Paul Gortmaker | a91de85 | 2013-08-01 15:01:06 -0400 | [diff] [blame] | 349 | J_ASSERT(commit_transaction->t_state == T_RUNNING); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | commit_transaction->t_state = T_LOCKED; |
| 351 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 352 | trace_jbd_commit_locking(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | spin_lock(&commit_transaction->t_handle_lock); |
| 354 | while (commit_transaction->t_updates) { |
| 355 | DEFINE_WAIT(wait); |
| 356 | |
| 357 | prepare_to_wait(&journal->j_wait_updates, &wait, |
| 358 | TASK_UNINTERRUPTIBLE); |
| 359 | if (commit_transaction->t_updates) { |
| 360 | spin_unlock(&commit_transaction->t_handle_lock); |
| 361 | spin_unlock(&journal->j_state_lock); |
| 362 | schedule(); |
| 363 | spin_lock(&journal->j_state_lock); |
| 364 | spin_lock(&commit_transaction->t_handle_lock); |
| 365 | } |
| 366 | finish_wait(&journal->j_wait_updates, &wait); |
| 367 | } |
| 368 | spin_unlock(&commit_transaction->t_handle_lock); |
| 369 | |
| 370 | J_ASSERT (commit_transaction->t_outstanding_credits <= |
| 371 | journal->j_max_transaction_buffers); |
| 372 | |
| 373 | /* |
| 374 | * First thing we are allowed to do is to discard any remaining |
| 375 | * BJ_Reserved buffers. Note, it is _not_ permissible to assume |
| 376 | * that there are no such buffers: if a large filesystem |
| 377 | * operation like a truncate needs to split itself over multiple |
| 378 | * transactions, then it may try to do a journal_restart() while |
| 379 | * there are still BJ_Reserved buffers outstanding. These must |
| 380 | * be released cleanly from the current transaction. |
| 381 | * |
| 382 | * In this case, the filesystem must still reserve write access |
| 383 | * again before modifying the buffer in the new transaction, but |
| 384 | * we do not require it to remember exactly which old buffers it |
| 385 | * has reserved. This is consistent with the existing behaviour |
| 386 | * that multiple journal_get_write_access() calls to the same |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 387 | * buffer are perfectly permissible. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | */ |
| 389 | while (commit_transaction->t_reserved_list) { |
| 390 | jh = commit_transaction->t_reserved_list; |
| 391 | JBUFFER_TRACE(jh, "reserved, unused: refile"); |
| 392 | /* |
| 393 | * A journal_get_undo_access()+journal_release_buffer() may |
| 394 | * leave undo-committed data. |
| 395 | */ |
| 396 | if (jh->b_committed_data) { |
| 397 | struct buffer_head *bh = jh2bh(jh); |
| 398 | |
| 399 | jbd_lock_bh_state(bh); |
Mingming Cao | c089d49 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 400 | jbd_free(jh->b_committed_data, bh->b_size); |
Jesper Juhl | f99d49a | 2005-11-07 01:01:34 -0800 | [diff] [blame] | 401 | jh->b_committed_data = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | jbd_unlock_bh_state(bh); |
| 403 | } |
| 404 | journal_refile_buffer(journal, jh); |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * Now try to drop any written-back buffers from the journal's |
| 409 | * checkpoint lists. We do this *before* commit because it potentially |
| 410 | * frees some memory |
| 411 | */ |
| 412 | spin_lock(&journal->j_list_lock); |
| 413 | __journal_clean_checkpoint_list(journal); |
| 414 | spin_unlock(&journal->j_list_lock); |
| 415 | |
| 416 | jbd_debug (3, "JBD: commit phase 1\n"); |
| 417 | |
| 418 | /* |
Yongqiang Yang | 8c111b3 | 2011-11-19 17:34:29 +0800 | [diff] [blame] | 419 | * Clear revoked flag to reflect there is no revoked buffers |
| 420 | * in the next transaction which is going to be started. |
| 421 | */ |
| 422 | journal_clear_buffer_revoked_flags(journal); |
| 423 | |
| 424 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | * Switch to a new revoke table. |
| 426 | */ |
| 427 | journal_switch_revoke_table(journal); |
| 428 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 429 | trace_jbd_commit_flushing(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | commit_transaction->t_state = T_FLUSH; |
| 431 | journal->j_committing_transaction = commit_transaction; |
| 432 | journal->j_running_transaction = NULL; |
Josef Bacik | f420d4d | 2009-01-07 18:07:24 -0800 | [diff] [blame] | 433 | start_time = ktime_get(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | commit_transaction->t_log_start = journal->j_head; |
| 435 | wake_up(&journal->j_wait_transaction_locked); |
| 436 | spin_unlock(&journal->j_state_lock); |
| 437 | |
| 438 | jbd_debug (3, "JBD: commit phase 2\n"); |
| 439 | |
Jan Kara | 2db938b | 2011-02-21 17:25:37 +0100 | [diff] [blame] | 440 | if (tid_geq(journal->j_commit_waited, commit_transaction->t_tid)) |
| 441 | write_op = WRITE_SYNC; |
| 442 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | * Now start flushing things to disk, in the order they appear |
| 445 | * on the transaction lists. Data blocks go first. |
| 446 | */ |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 447 | blk_start_plug(&plug); |
Theodore Ts'o | 512a004 | 2009-03-27 22:14:27 -0400 | [diff] [blame] | 448 | err = journal_submit_data_buffers(journal, commit_transaction, |
Jan Kara | 2db938b | 2011-02-21 17:25:37 +0100 | [diff] [blame] | 449 | write_op); |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 450 | blk_finish_plug(&plug); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | |
| 452 | /* |
| 453 | * Wait for all previously submitted IO to complete. |
| 454 | */ |
Jan Kara | 3998b93 | 2006-09-25 23:30:53 -0700 | [diff] [blame] | 455 | spin_lock(&journal->j_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | while (commit_transaction->t_locked_list) { |
| 457 | struct buffer_head *bh; |
| 458 | |
| 459 | jh = commit_transaction->t_locked_list->b_tprev; |
| 460 | bh = jh2bh(jh); |
| 461 | get_bh(bh); |
| 462 | if (buffer_locked(bh)) { |
| 463 | spin_unlock(&journal->j_list_lock); |
| 464 | wait_on_buffer(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | spin_lock(&journal->j_list_lock); |
| 466 | } |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 467 | if (unlikely(!buffer_uptodate(bh))) { |
Nick Piggin | 529ae9a | 2008-08-02 12:01:03 +0200 | [diff] [blame] | 468 | if (!trylock_page(bh->b_page)) { |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 469 | spin_unlock(&journal->j_list_lock); |
| 470 | lock_page(bh->b_page); |
| 471 | spin_lock(&journal->j_list_lock); |
| 472 | } |
| 473 | if (bh->b_page->mapping) |
| 474 | set_bit(AS_EIO, &bh->b_page->mapping->flags); |
| 475 | |
| 476 | unlock_page(bh->b_page); |
| 477 | SetPageError(bh->b_page); |
| 478 | err = -EIO; |
| 479 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | if (!inverted_lock(journal, bh)) { |
| 481 | put_bh(bh); |
| 482 | spin_lock(&journal->j_list_lock); |
| 483 | continue; |
| 484 | } |
Jan Kara | a61d90d | 2009-06-09 16:26:26 -0700 | [diff] [blame] | 485 | if (buffer_jbd(bh) && bh2jh(bh) == jh && |
| 486 | jh->b_transaction == commit_transaction && |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 487 | jh->b_jlist == BJ_Locked) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | __journal_unfile_buffer(jh); |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 489 | jbd_unlock_bh_state(bh); |
Toshiyuki Okajima | fc80c44 | 2008-07-25 01:46:29 -0700 | [diff] [blame] | 490 | release_data_buffer(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | cond_resched_lock(&journal->j_list_lock); |
| 492 | } |
| 493 | spin_unlock(&journal->j_list_lock); |
| 494 | |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 495 | if (err) { |
| 496 | char b[BDEVNAME_SIZE]; |
| 497 | |
| 498 | printk(KERN_WARNING |
| 499 | "JBD: Detected IO errors while flushing file data " |
| 500 | "on %s\n", bdevname(journal->j_fs_dev, b)); |
Hidehiro Kawai | 0e4fb5e | 2008-10-18 20:27:57 -0700 | [diff] [blame] | 501 | if (journal->j_flags & JFS_ABORT_ON_SYNCDATA_ERR) |
| 502 | journal_abort(journal, err); |
Hidehiro Kawai | cbe5f46 | 2008-07-25 01:46:30 -0700 | [diff] [blame] | 503 | err = 0; |
| 504 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 506 | blk_start_plug(&plug); |
| 507 | |
Jan Kara | 2db938b | 2011-02-21 17:25:37 +0100 | [diff] [blame] | 508 | journal_write_revoke_records(journal, commit_transaction, write_op); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | /* |
| 511 | * If we found any dirty or locked buffers, then we should have |
| 512 | * looped back up to the write_out_data label. If there weren't |
| 513 | * any then journal_clean_data_list should have wiped the list |
| 514 | * clean by now, so check that it is in fact empty. |
| 515 | */ |
| 516 | J_ASSERT (commit_transaction->t_sync_datalist == NULL); |
| 517 | |
| 518 | jbd_debug (3, "JBD: commit phase 3\n"); |
| 519 | |
| 520 | /* |
| 521 | * Way to go: we have now written out all of the data for a |
| 522 | * transaction! Now comes the tricky part: we need to write out |
| 523 | * metadata. Loop over the transaction's entire buffer list: |
| 524 | */ |
Mingming Cao | 772279c | 2008-05-14 16:05:41 -0700 | [diff] [blame] | 525 | spin_lock(&journal->j_state_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | commit_transaction->t_state = T_COMMIT; |
Mingming Cao | 772279c | 2008-05-14 16:05:41 -0700 | [diff] [blame] | 527 | spin_unlock(&journal->j_state_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 529 | trace_jbd_commit_logging(journal, commit_transaction); |
Josef Bacik | 5b9a499 | 2008-04-28 02:16:12 -0700 | [diff] [blame] | 530 | J_ASSERT(commit_transaction->t_nr_buffers <= |
| 531 | commit_transaction->t_outstanding_credits); |
| 532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | descriptor = NULL; |
| 534 | bufs = 0; |
| 535 | while (commit_transaction->t_buffers) { |
| 536 | |
| 537 | /* Find the next buffer to be journaled... */ |
| 538 | |
| 539 | jh = commit_transaction->t_buffers; |
| 540 | |
| 541 | /* 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] | 542 | release it. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | |
| 544 | if (is_journal_aborted(journal)) { |
Hidehiro Kawai | 885e353 | 2008-10-18 20:27:54 -0700 | [diff] [blame] | 545 | clear_buffer_jbddirty(jh2bh(jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 546 | JBUFFER_TRACE(jh, "journal is aborting: refile"); |
| 547 | journal_refile_buffer(journal, jh); |
| 548 | /* If that was the last one, we need to clean up |
| 549 | * any descriptor buffers which may have been |
| 550 | * already allocated, even if we are now |
| 551 | * aborting. */ |
| 552 | if (!commit_transaction->t_buffers) |
| 553 | goto start_journal_io; |
| 554 | continue; |
| 555 | } |
| 556 | |
| 557 | /* Make sure we have a descriptor block in which to |
| 558 | record the metadata buffer. */ |
| 559 | |
| 560 | if (!descriptor) { |
| 561 | struct buffer_head *bh; |
| 562 | |
| 563 | J_ASSERT (bufs == 0); |
| 564 | |
| 565 | jbd_debug(4, "JBD: get descriptor\n"); |
| 566 | |
| 567 | descriptor = journal_get_descriptor_buffer(journal); |
| 568 | if (!descriptor) { |
Jan Kara | 7a266e7 | 2007-10-18 23:39:22 -0700 | [diff] [blame] | 569 | journal_abort(journal, -EIO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | continue; |
| 571 | } |
| 572 | |
| 573 | bh = jh2bh(descriptor); |
| 574 | jbd_debug(4, "JBD: got buffer %llu (%p)\n", |
| 575 | (unsigned long long)bh->b_blocknr, bh->b_data); |
| 576 | header = (journal_header_t *)&bh->b_data[0]; |
| 577 | header->h_magic = cpu_to_be32(JFS_MAGIC_NUMBER); |
| 578 | header->h_blocktype = cpu_to_be32(JFS_DESCRIPTOR_BLOCK); |
| 579 | header->h_sequence = cpu_to_be32(commit_transaction->t_tid); |
| 580 | |
| 581 | tagp = &bh->b_data[sizeof(journal_header_t)]; |
| 582 | space_left = bh->b_size - sizeof(journal_header_t); |
| 583 | first_tag = 1; |
| 584 | set_buffer_jwrite(bh); |
| 585 | set_buffer_dirty(bh); |
| 586 | wbuf[bufs++] = bh; |
| 587 | |
| 588 | /* Record it so that we can wait for IO |
| 589 | completion later */ |
| 590 | BUFFER_TRACE(bh, "ph3: file as descriptor"); |
| 591 | journal_file_buffer(descriptor, commit_transaction, |
| 592 | BJ_LogCtl); |
| 593 | } |
| 594 | |
| 595 | /* Where is the buffer to be written? */ |
| 596 | |
| 597 | err = journal_next_log_block(journal, &blocknr); |
| 598 | /* If the block mapping failed, just abandon the buffer |
| 599 | and repeat this loop: we'll fall into the |
| 600 | refile-on-abort condition above. */ |
| 601 | if (err) { |
Jan Kara | 7a266e7 | 2007-10-18 23:39:22 -0700 | [diff] [blame] | 602 | journal_abort(journal, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | continue; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * start_this_handle() uses t_outstanding_credits to determine |
| 608 | * the free space in the log, but this counter is changed |
| 609 | * by journal_next_log_block() also. |
| 610 | */ |
| 611 | commit_transaction->t_outstanding_credits--; |
| 612 | |
| 613 | /* Bump b_count to prevent truncate from stumbling over |
| 614 | the shadowed buffer! @@@ This can go if we ever get |
| 615 | rid of the BJ_IO/BJ_Shadow pairing of buffers. */ |
Namhyung Kim | e4d5e3a4 | 2010-10-16 17:11:02 +0900 | [diff] [blame] | 616 | get_bh(jh2bh(jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
| 618 | /* Make a temporary IO buffer with which to write it out |
| 619 | (this will requeue both the metadata buffer and the |
| 620 | temporary IO buffer). new_bh goes on BJ_IO*/ |
| 621 | |
Namhyung Kim | a910eef | 2010-10-08 20:05:06 +0900 | [diff] [blame] | 622 | set_buffer_jwrite(jh2bh(jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | /* |
| 624 | * akpm: journal_write_metadata_buffer() sets |
| 625 | * new_bh->b_transaction to commit_transaction. |
| 626 | * We need to clean this up before we release new_bh |
| 627 | * (which is of type BJ_IO) |
| 628 | */ |
| 629 | JBUFFER_TRACE(jh, "ph3: write metadata"); |
| 630 | flags = journal_write_metadata_buffer(commit_transaction, |
| 631 | jh, &new_jh, blocknr); |
Namhyung Kim | a910eef | 2010-10-08 20:05:06 +0900 | [diff] [blame] | 632 | set_buffer_jwrite(jh2bh(new_jh)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | wbuf[bufs++] = jh2bh(new_jh); |
| 634 | |
| 635 | /* Record the new block's tag in the current descriptor |
| 636 | buffer */ |
| 637 | |
| 638 | tag_flag = 0; |
| 639 | if (flags & 1) |
| 640 | tag_flag |= JFS_FLAG_ESCAPE; |
| 641 | if (!first_tag) |
| 642 | tag_flag |= JFS_FLAG_SAME_UUID; |
| 643 | |
| 644 | tag = (journal_block_tag_t *) tagp; |
| 645 | tag->t_blocknr = cpu_to_be32(jh2bh(jh)->b_blocknr); |
| 646 | tag->t_flags = cpu_to_be32(tag_flag); |
| 647 | tagp += sizeof(journal_block_tag_t); |
| 648 | space_left -= sizeof(journal_block_tag_t); |
| 649 | |
| 650 | if (first_tag) { |
| 651 | memcpy (tagp, journal->j_uuid, 16); |
| 652 | tagp += 16; |
| 653 | space_left -= 16; |
| 654 | first_tag = 0; |
| 655 | } |
| 656 | |
| 657 | /* If there's no more to do, or if the descriptor is full, |
| 658 | let the IO rip! */ |
| 659 | |
| 660 | if (bufs == journal->j_wbufsize || |
| 661 | commit_transaction->t_buffers == NULL || |
| 662 | space_left < sizeof(journal_block_tag_t) + 16) { |
| 663 | |
| 664 | jbd_debug(4, "JBD: Submit %d IOs\n", bufs); |
| 665 | |
| 666 | /* Write an end-of-descriptor marker before |
| 667 | submitting the IOs. "tag" still points to |
| 668 | the last tag we set up. */ |
| 669 | |
| 670 | tag->t_flags |= cpu_to_be32(JFS_FLAG_LAST_TAG); |
| 671 | |
| 672 | start_journal_io: |
| 673 | for (i = 0; i < bufs; i++) { |
| 674 | struct buffer_head *bh = wbuf[i]; |
| 675 | lock_buffer(bh); |
| 676 | clear_buffer_dirty(bh); |
| 677 | set_buffer_uptodate(bh); |
| 678 | bh->b_end_io = journal_end_buffer_io_sync; |
Darrick J. Wong | 713685111 | 2013-04-29 15:07:25 -0700 | [diff] [blame] | 679 | /* |
| 680 | * In data=journal mode, here we can end up |
| 681 | * writing pagecache data that might be |
| 682 | * mmapped. Since we can't afford to clean the |
| 683 | * page and set PageWriteback (see the comment |
| 684 | * near the other use of _submit_bh()), the |
| 685 | * data can change while the write is in |
| 686 | * flight. Tell the block layer to bounce the |
| 687 | * bio pages if stable pages are required. |
| 688 | */ |
| 689 | _submit_bh(write_op, bh, 1 << BIO_SNAP_STABLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | } |
| 691 | cond_resched(); |
| 692 | |
| 693 | /* Force a new descriptor to be generated next |
| 694 | time round the loop. */ |
| 695 | descriptor = NULL; |
| 696 | bufs = 0; |
| 697 | } |
| 698 | } |
| 699 | |
Jens Axboe | 65ab802 | 2011-03-17 10:56:45 +0100 | [diff] [blame] | 700 | blk_finish_plug(&plug); |
| 701 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | /* Lo and behold: we have just managed to send a transaction to |
| 703 | the log. Before we can commit it, wait for the IO so far to |
| 704 | complete. Control buffers being written are on the |
| 705 | transaction's t_log_list queue, and metadata buffers are on |
| 706 | the t_iobuf_list queue. |
| 707 | |
| 708 | Wait for the buffers in reverse order. That way we are |
| 709 | less likely to be woken up until all IOs have completed, and |
| 710 | so we incur less scheduling load. |
| 711 | */ |
| 712 | |
| 713 | jbd_debug(3, "JBD: commit phase 4\n"); |
| 714 | |
| 715 | /* |
| 716 | * akpm: these are BJ_IO, and j_list_lock is not needed. |
| 717 | * See __journal_try_to_free_buffer. |
| 718 | */ |
| 719 | wait_for_iobuf: |
| 720 | while (commit_transaction->t_iobuf_list != NULL) { |
| 721 | struct buffer_head *bh; |
| 722 | |
| 723 | jh = commit_transaction->t_iobuf_list->b_tprev; |
| 724 | bh = jh2bh(jh); |
| 725 | if (buffer_locked(bh)) { |
| 726 | wait_on_buffer(bh); |
| 727 | goto wait_for_iobuf; |
| 728 | } |
| 729 | if (cond_resched()) |
| 730 | goto wait_for_iobuf; |
| 731 | |
| 732 | if (unlikely(!buffer_uptodate(bh))) |
| 733 | err = -EIO; |
| 734 | |
| 735 | clear_buffer_jwrite(bh); |
| 736 | |
| 737 | JBUFFER_TRACE(jh, "ph4: unfile after journal write"); |
| 738 | journal_unfile_buffer(journal, jh); |
| 739 | |
| 740 | /* |
| 741 | * ->t_iobuf_list should contain only dummy buffer_heads |
| 742 | * which were created by journal_write_metadata_buffer(). |
| 743 | */ |
| 744 | BUFFER_TRACE(bh, "dumping temporary bh"); |
| 745 | journal_put_journal_head(jh); |
| 746 | __brelse(bh); |
| 747 | J_ASSERT_BH(bh, atomic_read(&bh->b_count) == 0); |
| 748 | free_buffer_head(bh); |
| 749 | |
| 750 | /* We also have to unlock and free the corresponding |
| 751 | shadowed buffer */ |
| 752 | jh = commit_transaction->t_shadow_list->b_tprev; |
| 753 | bh = jh2bh(jh); |
Namhyung Kim | a910eef | 2010-10-08 20:05:06 +0900 | [diff] [blame] | 754 | clear_buffer_jwrite(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | J_ASSERT_BH(bh, buffer_jbddirty(bh)); |
| 756 | |
| 757 | /* The metadata is now released for reuse, but we need |
| 758 | to remember it against this transaction so that when |
| 759 | we finally commit, we can do any checkpointing |
| 760 | required. */ |
| 761 | JBUFFER_TRACE(jh, "file as BJ_Forget"); |
| 762 | journal_file_buffer(jh, commit_transaction, BJ_Forget); |
Jan Kara | 2842bb2 | 2011-05-05 13:59:35 +0200 | [diff] [blame] | 763 | /* |
| 764 | * Wake up any transactions which were waiting for this |
| 765 | * IO to complete. The barrier must be here so that changes |
| 766 | * by journal_file_buffer() take effect before wake_up_bit() |
| 767 | * does the waitqueue check. |
| 768 | */ |
| 769 | smp_mb(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | wake_up_bit(&bh->b_state, BH_Unshadow); |
| 771 | JBUFFER_TRACE(jh, "brelse shadowed buffer"); |
| 772 | __brelse(bh); |
| 773 | } |
| 774 | |
| 775 | J_ASSERT (commit_transaction->t_shadow_list == NULL); |
| 776 | |
| 777 | jbd_debug(3, "JBD: commit phase 5\n"); |
| 778 | |
| 779 | /* Here we wait for the revoke record and descriptor record buffers */ |
| 780 | wait_for_ctlbuf: |
| 781 | while (commit_transaction->t_log_list != NULL) { |
| 782 | struct buffer_head *bh; |
| 783 | |
| 784 | jh = commit_transaction->t_log_list->b_tprev; |
| 785 | bh = jh2bh(jh); |
| 786 | if (buffer_locked(bh)) { |
| 787 | wait_on_buffer(bh); |
| 788 | goto wait_for_ctlbuf; |
| 789 | } |
| 790 | if (cond_resched()) |
| 791 | goto wait_for_ctlbuf; |
| 792 | |
| 793 | if (unlikely(!buffer_uptodate(bh))) |
| 794 | err = -EIO; |
| 795 | |
| 796 | BUFFER_TRACE(bh, "ph5: control buffer writeout done: unfile"); |
| 797 | clear_buffer_jwrite(bh); |
| 798 | journal_unfile_buffer(journal, jh); |
| 799 | journal_put_journal_head(jh); |
| 800 | __brelse(bh); /* One for getblk */ |
| 801 | /* AKPM: bforget here */ |
| 802 | } |
| 803 | |
Hidehiro Kawai | d1645e5 | 2008-10-18 20:27:53 -0700 | [diff] [blame] | 804 | if (err) |
| 805 | journal_abort(journal, err); |
| 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | jbd_debug(3, "JBD: commit phase 6\n"); |
| 808 | |
Jan Kara | 03f4d80 | 2010-04-15 22:16:24 +0200 | [diff] [blame] | 809 | /* All metadata is written, now write commit record and do cleanup */ |
| 810 | spin_lock(&journal->j_state_lock); |
| 811 | J_ASSERT(commit_transaction->t_state == T_COMMIT); |
| 812 | commit_transaction->t_state = T_COMMIT_RECORD; |
| 813 | spin_unlock(&journal->j_state_lock); |
| 814 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | if (journal_write_commit_record(journal, commit_transaction)) |
| 816 | err = -EIO; |
| 817 | |
| 818 | if (err) |
Jan Kara | 7a266e7 | 2007-10-18 23:39:22 -0700 | [diff] [blame] | 819 | journal_abort(journal, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | /* End of a transaction! Finally, we can do checkpoint |
| 822 | processing: any buffers committed as a result of this |
| 823 | transaction can be removed from any checkpoint list it was on |
| 824 | before. */ |
| 825 | |
| 826 | jbd_debug(3, "JBD: commit phase 7\n"); |
| 827 | |
| 828 | J_ASSERT(commit_transaction->t_sync_datalist == NULL); |
| 829 | J_ASSERT(commit_transaction->t_buffers == NULL); |
| 830 | J_ASSERT(commit_transaction->t_checkpoint_list == NULL); |
| 831 | J_ASSERT(commit_transaction->t_iobuf_list == NULL); |
| 832 | J_ASSERT(commit_transaction->t_shadow_list == NULL); |
| 833 | J_ASSERT(commit_transaction->t_log_list == NULL); |
| 834 | |
| 835 | restart_loop: |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 836 | /* |
| 837 | * As there are other places (journal_unmap_buffer()) adding buffers |
| 838 | * to this list we have to be careful and hold the j_list_lock. |
| 839 | */ |
| 840 | spin_lock(&journal->j_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | while (commit_transaction->t_forget) { |
| 842 | transaction_t *cp_transaction; |
| 843 | struct buffer_head *bh; |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 844 | int try_to_free = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | |
| 846 | jh = commit_transaction->t_forget; |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 847 | spin_unlock(&journal->j_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | bh = jh2bh(jh); |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 849 | /* |
| 850 | * Get a reference so that bh cannot be freed before we are |
| 851 | * done with it. |
| 852 | */ |
| 853 | get_bh(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | jbd_lock_bh_state(bh); |
| 855 | J_ASSERT_JH(jh, jh->b_transaction == commit_transaction || |
| 856 | jh->b_transaction == journal->j_running_transaction); |
| 857 | |
| 858 | /* |
| 859 | * If there is undo-protected committed data against |
| 860 | * this buffer, then we can remove it now. If it is a |
| 861 | * buffer needing such protection, the old frozen_data |
| 862 | * field now points to a committed version of the |
| 863 | * buffer, so rotate that field to the new committed |
| 864 | * data. |
| 865 | * |
| 866 | * Otherwise, we can just throw away the frozen data now. |
| 867 | */ |
| 868 | if (jh->b_committed_data) { |
Mingming Cao | c089d49 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 869 | jbd_free(jh->b_committed_data, bh->b_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 870 | jh->b_committed_data = NULL; |
| 871 | if (jh->b_frozen_data) { |
| 872 | jh->b_committed_data = jh->b_frozen_data; |
| 873 | jh->b_frozen_data = NULL; |
| 874 | } |
| 875 | } else if (jh->b_frozen_data) { |
Mingming Cao | c089d49 | 2007-10-16 18:38:25 -0400 | [diff] [blame] | 876 | jbd_free(jh->b_frozen_data, bh->b_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | jh->b_frozen_data = NULL; |
| 878 | } |
| 879 | |
| 880 | spin_lock(&journal->j_list_lock); |
| 881 | cp_transaction = jh->b_cp_transaction; |
| 882 | if (cp_transaction) { |
| 883 | JBUFFER_TRACE(jh, "remove from old cp transaction"); |
| 884 | __journal_remove_checkpoint(jh); |
| 885 | } |
| 886 | |
| 887 | /* Only re-checkpoint the buffer_head if it is marked |
| 888 | * dirty. If the buffer was added to the BJ_Forget list |
| 889 | * by journal_forget, it may no longer be dirty and |
| 890 | * there's no point in keeping a checkpoint record for |
| 891 | * it. */ |
| 892 | |
Jan Kara | 09e05d4 | 2012-07-11 23:16:25 +0200 | [diff] [blame] | 893 | /* |
| 894 | * A buffer which has been freed while still being journaled by |
| 895 | * a previous transaction. |
| 896 | */ |
| 897 | if (buffer_freed(bh)) { |
| 898 | /* |
| 899 | * If the running transaction is the one containing |
| 900 | * "add to orphan" operation (b_next_transaction != |
| 901 | * NULL), we have to wait for that transaction to |
| 902 | * commit before we can really get rid of the buffer. |
| 903 | * So just clear b_modified to not confuse transaction |
| 904 | * credit accounting and refile the buffer to |
| 905 | * BJ_Forget of the running transaction. If the just |
| 906 | * committed transaction contains "add to orphan" |
| 907 | * operation, we can completely invalidate the buffer |
| 908 | * now. We are rather throughout in that since the |
| 909 | * buffer may be still accessible when blocksize < |
| 910 | * pagesize and it is attached to the last partial |
| 911 | * page. |
| 912 | */ |
| 913 | jh->b_modified = 0; |
| 914 | if (!jh->b_next_transaction) { |
| 915 | clear_buffer_freed(bh); |
| 916 | clear_buffer_jbddirty(bh); |
| 917 | clear_buffer_mapped(bh); |
| 918 | clear_buffer_new(bh); |
| 919 | clear_buffer_req(bh); |
| 920 | bh->b_bdev = NULL; |
| 921 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | } |
| 923 | |
| 924 | if (buffer_jbddirty(bh)) { |
| 925 | JBUFFER_TRACE(jh, "add to new checkpointing trans"); |
| 926 | __journal_insert_checkpoint(jh, commit_transaction); |
Hidehiro Kawai | 885e353 | 2008-10-18 20:27:54 -0700 | [diff] [blame] | 927 | if (is_journal_aborted(journal)) |
| 928 | clear_buffer_jbddirty(bh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | } else { |
| 930 | J_ASSERT_BH(bh, !buffer_dirty(bh)); |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 931 | /* |
| 932 | * The buffer on BJ_Forget list and not jbddirty means |
Jan Kara | 9ada734 | 2006-06-23 02:05:25 -0700 | [diff] [blame] | 933 | * it has been freed by this transaction and hence it |
| 934 | * could not have been reallocated until this |
| 935 | * transaction has committed. *BUT* it could be |
| 936 | * reallocated once we have written all the data to |
| 937 | * disk and before we process the buffer on BJ_Forget |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 938 | * list. |
| 939 | */ |
| 940 | if (!jh->b_next_transaction) |
| 941 | try_to_free = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | } |
Jan Kara | bb18924 | 2011-06-24 23:11:59 +0200 | [diff] [blame] | 943 | JBUFFER_TRACE(jh, "refile or unfile freed buffer"); |
| 944 | __journal_refile_buffer(jh); |
| 945 | jbd_unlock_bh_state(bh); |
| 946 | if (try_to_free) |
| 947 | release_buffer_page(bh); |
| 948 | else |
| 949 | __brelse(bh); |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 950 | cond_resched_lock(&journal->j_list_lock); |
| 951 | } |
| 952 | spin_unlock(&journal->j_list_lock); |
| 953 | /* |
Jan Kara | d4beaf4 | 2007-12-04 23:45:27 -0800 | [diff] [blame] | 954 | * This is a bit sleazy. We use j_list_lock to protect transition |
| 955 | * of a transaction into T_FINISHED state and calling |
| 956 | * __journal_drop_transaction(). Otherwise we could race with |
| 957 | * other checkpointing code processing the transaction... |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 958 | */ |
| 959 | spin_lock(&journal->j_state_lock); |
| 960 | spin_lock(&journal->j_list_lock); |
| 961 | /* |
| 962 | * Now recheck if some buffers did not get attached to the transaction |
| 963 | * while the lock was dropped... |
| 964 | */ |
| 965 | if (commit_transaction->t_forget) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | spin_unlock(&journal->j_list_lock); |
Jan Kara | e6c9f5c | 2005-09-06 15:19:09 -0700 | [diff] [blame] | 967 | spin_unlock(&journal->j_state_lock); |
| 968 | goto restart_loop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | } |
| 970 | |
| 971 | /* Done with this transaction! */ |
| 972 | |
| 973 | jbd_debug(3, "JBD: commit phase 8\n"); |
| 974 | |
Jan Kara | 03f4d80 | 2010-04-15 22:16:24 +0200 | [diff] [blame] | 975 | J_ASSERT(commit_transaction->t_state == T_COMMIT_RECORD); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | commit_transaction->t_state = T_FINISHED; |
| 978 | J_ASSERT(commit_transaction == journal->j_committing_transaction); |
| 979 | journal->j_commit_sequence = commit_transaction->t_tid; |
| 980 | journal->j_committing_transaction = NULL; |
Josef Bacik | f420d4d | 2009-01-07 18:07:24 -0800 | [diff] [blame] | 981 | commit_time = ktime_to_ns(ktime_sub(ktime_get(), start_time)); |
| 982 | |
| 983 | /* |
| 984 | * weight the commit time higher than the average time so we don't |
| 985 | * react too strongly to vast changes in commit time |
| 986 | */ |
| 987 | if (likely(journal->j_average_commit_time)) |
| 988 | journal->j_average_commit_time = (commit_time*3 + |
| 989 | journal->j_average_commit_time) / 4; |
| 990 | else |
| 991 | journal->j_average_commit_time = commit_time; |
| 992 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | spin_unlock(&journal->j_state_lock); |
| 994 | |
Jan Kara | fe28e42 | 2007-07-15 23:37:18 -0700 | [diff] [blame] | 995 | if (commit_transaction->t_checkpoint_list == NULL && |
| 996 | commit_transaction->t_checkpoint_io_list == NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | __journal_drop_transaction(journal, commit_transaction); |
| 998 | } else { |
| 999 | if (journal->j_checkpoint_transactions == NULL) { |
| 1000 | journal->j_checkpoint_transactions = commit_transaction; |
| 1001 | commit_transaction->t_cpnext = commit_transaction; |
| 1002 | commit_transaction->t_cpprev = commit_transaction; |
| 1003 | } else { |
| 1004 | commit_transaction->t_cpnext = |
| 1005 | journal->j_checkpoint_transactions; |
| 1006 | commit_transaction->t_cpprev = |
| 1007 | commit_transaction->t_cpnext->t_cpprev; |
| 1008 | commit_transaction->t_cpnext->t_cpprev = |
| 1009 | commit_transaction; |
| 1010 | commit_transaction->t_cpprev->t_cpnext = |
| 1011 | commit_transaction; |
| 1012 | } |
| 1013 | } |
| 1014 | spin_unlock(&journal->j_list_lock); |
| 1015 | |
Lukas Czerner | 99cb1a3 | 2011-05-23 18:33:02 +0200 | [diff] [blame] | 1016 | trace_jbd_end_commit(journal, commit_transaction); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | jbd_debug(1, "JBD: commit %d complete, head %d\n", |
| 1018 | journal->j_commit_sequence, journal->j_tail_sequence); |
| 1019 | |
| 1020 | wake_up(&journal->j_wait_done_commit); |
| 1021 | } |