Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 1 | /* |
Uwe Kleine-König | 5886269 | 2007-05-09 07:51:49 +0200 | [diff] [blame] | 2 | * linux/fs/jbd2/checkpoint.c |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 3 | * |
| 4 | * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 |
| 5 | * |
| 6 | * Copyright 1999 Red Hat Software --- 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 | * Checkpoint routines for the generic filesystem journaling code. |
| 13 | * Part of the ext2fs journaling system. |
| 14 | * |
| 15 | * Checkpointing is the process of ensuring that a section of the log is |
| 16 | * committed fully to disk, so that that portion of the log can be |
| 17 | * reused. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/time.h> |
| 21 | #include <linux/fs.h> |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 22 | #include <linux/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 23 | #include <linux/errno.h> |
| 24 | #include <linux/slab.h> |
Theodore Ts'o | cc3e1be | 2009-12-23 06:52:08 -0500 | [diff] [blame] | 25 | #include <linux/blkdev.h> |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 26 | #include <trace/events/jbd2.h> |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 27 | |
| 28 | /* |
| 29 | * Unlink a buffer from a transaction checkpoint list. |
| 30 | * |
| 31 | * Called with j_list_lock held. |
| 32 | */ |
| 33 | static inline void __buffer_unlink_first(struct journal_head *jh) |
| 34 | { |
| 35 | transaction_t *transaction = jh->b_cp_transaction; |
| 36 | |
| 37 | jh->b_cpnext->b_cpprev = jh->b_cpprev; |
| 38 | jh->b_cpprev->b_cpnext = jh->b_cpnext; |
| 39 | if (transaction->t_checkpoint_list == jh) { |
| 40 | transaction->t_checkpoint_list = jh->b_cpnext; |
| 41 | if (transaction->t_checkpoint_list == jh) |
| 42 | transaction->t_checkpoint_list = NULL; |
| 43 | } |
| 44 | } |
| 45 | |
| 46 | /* |
| 47 | * Unlink a buffer from a transaction checkpoint(io) list. |
| 48 | * |
| 49 | * Called with j_list_lock held. |
| 50 | */ |
| 51 | static inline void __buffer_unlink(struct journal_head *jh) |
| 52 | { |
| 53 | transaction_t *transaction = jh->b_cp_transaction; |
| 54 | |
| 55 | __buffer_unlink_first(jh); |
| 56 | if (transaction->t_checkpoint_io_list == jh) { |
| 57 | transaction->t_checkpoint_io_list = jh->b_cpnext; |
| 58 | if (transaction->t_checkpoint_io_list == jh) |
| 59 | transaction->t_checkpoint_io_list = NULL; |
| 60 | } |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Move a buffer from the checkpoint list to the checkpoint io list |
| 65 | * |
| 66 | * Called with j_list_lock held |
| 67 | */ |
| 68 | static inline void __buffer_relink_io(struct journal_head *jh) |
| 69 | { |
| 70 | transaction_t *transaction = jh->b_cp_transaction; |
| 71 | |
| 72 | __buffer_unlink_first(jh); |
| 73 | |
| 74 | if (!transaction->t_checkpoint_io_list) { |
| 75 | jh->b_cpnext = jh->b_cpprev = jh; |
| 76 | } else { |
| 77 | jh->b_cpnext = transaction->t_checkpoint_io_list; |
| 78 | jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev; |
| 79 | jh->b_cpprev->b_cpnext = jh; |
| 80 | jh->b_cpnext->b_cpprev = jh; |
| 81 | } |
| 82 | transaction->t_checkpoint_io_list = jh; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Try to release a checkpointed buffer from its transaction. |
| 87 | * Returns 1 if we released it and 2 if we also released the |
| 88 | * whole transaction. |
| 89 | * |
| 90 | * Requires j_list_lock |
| 91 | * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it |
| 92 | */ |
| 93 | static int __try_to_free_cp_buf(struct journal_head *jh) |
| 94 | { |
| 95 | int ret = 0; |
| 96 | struct buffer_head *bh = jh2bh(jh); |
| 97 | |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 98 | if (jh->b_jlist == BJ_None && !buffer_locked(bh) && |
| 99 | !buffer_dirty(bh) && !buffer_write_io_error(bh)) { |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 100 | /* |
| 101 | * Get our reference so that bh cannot be freed before |
| 102 | * we unlock it |
| 103 | */ |
| 104 | get_bh(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 105 | JBUFFER_TRACE(jh, "remove from checkpoint list"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 106 | ret = __jbd2_journal_remove_checkpoint(jh) + 1; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 107 | jbd_unlock_bh_state(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 108 | BUFFER_TRACE(bh, "release"); |
| 109 | __brelse(bh); |
| 110 | } else { |
| 111 | jbd_unlock_bh_state(bh); |
| 112 | } |
| 113 | return ret; |
| 114 | } |
| 115 | |
| 116 | /* |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 117 | * __jbd2_log_wait_for_space: wait until there is space in the journal. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 118 | * |
| 119 | * Called under j-state_lock *only*. It will be unlocked if we have to wait |
| 120 | * for a checkpoint to free up some space in the log. |
| 121 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 122 | void __jbd2_log_wait_for_space(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 123 | { |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 124 | int nblocks, space_left; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 125 | /* assert_spin_locked(&journal->j_state_lock); */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 126 | |
| 127 | nblocks = jbd_space_needed(journal); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 128 | while (__jbd2_log_space_left(journal) < nblocks) { |
| 129 | if (journal->j_flags & JBD2_ABORT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 130 | return; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 131 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 132 | mutex_lock(&journal->j_checkpoint_mutex); |
| 133 | |
| 134 | /* |
| 135 | * Test again, another process may have checkpointed while we |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 136 | * were waiting for the checkpoint lock. If there are no |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 137 | * transactions ready to be checkpointed, try to recover |
| 138 | * journal space by calling cleanup_journal_tail(), and if |
| 139 | * that doesn't work, by waiting for the currently committing |
| 140 | * transaction to complete. If there is absolutely no way |
| 141 | * to make progress, this is either a BUG or corrupted |
| 142 | * filesystem, so abort the journal and leave a stack |
| 143 | * trace for forensic evidence. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 144 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 145 | write_lock(&journal->j_state_lock); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 146 | spin_lock(&journal->j_list_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 147 | nblocks = jbd_space_needed(journal); |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 148 | space_left = __jbd2_log_space_left(journal); |
| 149 | if (space_left < nblocks) { |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 150 | int chkpt = journal->j_checkpoint_transactions != NULL; |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 151 | tid_t tid = 0; |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 152 | |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 153 | if (journal->j_committing_transaction) |
| 154 | tid = journal->j_committing_transaction->t_tid; |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 155 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 156 | write_unlock(&journal->j_state_lock); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 157 | if (chkpt) { |
| 158 | jbd2_log_do_checkpoint(journal); |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 159 | } else if (jbd2_cleanup_journal_tail(journal) == 0) { |
| 160 | /* We were able to recover space; yay! */ |
| 161 | ; |
| 162 | } else if (tid) { |
| 163 | jbd2_log_wait_commit(journal, tid); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 164 | } else { |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 165 | printk(KERN_ERR "%s: needed %d blocks and " |
| 166 | "only had %d space available\n", |
| 167 | __func__, nblocks, space_left); |
| 168 | printk(KERN_ERR "%s: no way to get more " |
| 169 | "journal space in %s\n", __func__, |
| 170 | journal->j_devname); |
| 171 | WARN_ON(1); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 172 | jbd2_journal_abort(journal, 0); |
| 173 | } |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 174 | write_lock(&journal->j_state_lock); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 175 | } else { |
| 176 | spin_unlock(&journal->j_list_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 177 | } |
| 178 | mutex_unlock(&journal->j_checkpoint_mutex); |
| 179 | } |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * We were unable to perform jbd_trylock_bh_state() inside j_list_lock. |
| 184 | * The caller must restart a list walk. Wait for someone else to run |
| 185 | * jbd_unlock_bh_state(). |
| 186 | */ |
| 187 | static void jbd_sync_bh(journal_t *journal, struct buffer_head *bh) |
| 188 | __releases(journal->j_list_lock) |
| 189 | { |
| 190 | get_bh(bh); |
| 191 | spin_unlock(&journal->j_list_lock); |
| 192 | jbd_lock_bh_state(bh); |
| 193 | jbd_unlock_bh_state(bh); |
| 194 | put_bh(bh); |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Clean up transaction's list of buffers submitted for io. |
| 199 | * We wait for any pending IO to complete and remove any clean |
| 200 | * buffers. Note that we take the buffers in the opposite ordering |
| 201 | * from the one in which they were submitted for IO. |
| 202 | * |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 203 | * Return 0 on success, and return <0 if some buffers have failed |
| 204 | * to be written out. |
| 205 | * |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 206 | * Called with j_list_lock held. |
| 207 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 208 | static int __wait_cp_io(journal_t *journal, transaction_t *transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 209 | { |
| 210 | struct journal_head *jh; |
| 211 | struct buffer_head *bh; |
| 212 | tid_t this_tid; |
| 213 | int released = 0; |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 214 | int ret = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 215 | |
| 216 | this_tid = transaction->t_tid; |
| 217 | restart: |
| 218 | /* Did somebody clean up the transaction in the meanwhile? */ |
| 219 | if (journal->j_checkpoint_transactions != transaction || |
| 220 | transaction->t_tid != this_tid) |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 221 | return ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 222 | while (!released && transaction->t_checkpoint_io_list) { |
| 223 | jh = transaction->t_checkpoint_io_list; |
| 224 | bh = jh2bh(jh); |
| 225 | if (!jbd_trylock_bh_state(bh)) { |
| 226 | jbd_sync_bh(journal, bh); |
| 227 | spin_lock(&journal->j_list_lock); |
| 228 | goto restart; |
| 229 | } |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 230 | get_bh(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 231 | if (buffer_locked(bh)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 232 | spin_unlock(&journal->j_list_lock); |
| 233 | jbd_unlock_bh_state(bh); |
| 234 | wait_on_buffer(bh); |
| 235 | /* the journal_head may have gone by now */ |
| 236 | BUFFER_TRACE(bh, "brelse"); |
| 237 | __brelse(bh); |
| 238 | spin_lock(&journal->j_list_lock); |
| 239 | goto restart; |
| 240 | } |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 241 | if (unlikely(buffer_write_io_error(bh))) |
| 242 | ret = -EIO; |
| 243 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 244 | /* |
| 245 | * Now in whatever state the buffer currently is, we know that |
| 246 | * it has been written out and so we can drop it from the list |
| 247 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 248 | released = __jbd2_journal_remove_checkpoint(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 249 | jbd_unlock_bh_state(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 250 | __brelse(bh); |
| 251 | } |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 252 | |
| 253 | return ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 254 | } |
| 255 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 256 | static void |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 257 | __flush_batch(journal_t *journal, int *batch_count) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 258 | { |
| 259 | int i; |
Tao Ma | d3ad843 | 2011-06-27 12:36:29 -0400 | [diff] [blame] | 260 | struct blk_plug plug; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 261 | |
Tao Ma | d3ad843 | 2011-06-27 12:36:29 -0400 | [diff] [blame] | 262 | blk_start_plug(&plug); |
Christoph Hellwig | 9cb569d | 2010-08-11 17:06:24 +0200 | [diff] [blame] | 263 | for (i = 0; i < *batch_count; i++) |
Tao Ma | d3ad843 | 2011-06-27 12:36:29 -0400 | [diff] [blame] | 264 | write_dirty_buffer(journal->j_chkpt_bhs[i], WRITE_SYNC); |
| 265 | blk_finish_plug(&plug); |
Christoph Hellwig | 9cb569d | 2010-08-11 17:06:24 +0200 | [diff] [blame] | 266 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 267 | for (i = 0; i < *batch_count; i++) { |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 268 | struct buffer_head *bh = journal->j_chkpt_bhs[i]; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 269 | BUFFER_TRACE(bh, "brelse"); |
| 270 | __brelse(bh); |
| 271 | } |
| 272 | *batch_count = 0; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Try to flush one buffer from the checkpoint list to disk. |
| 277 | * |
| 278 | * Return 1 if something happened which requires us to abort the current |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 279 | * scan of the checkpoint list. Return <0 if the buffer has failed to |
| 280 | * be written out. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 281 | * |
| 282 | * Called with j_list_lock held and drops it if 1 is returned |
| 283 | * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it |
| 284 | */ |
| 285 | static int __process_buffer(journal_t *journal, struct journal_head *jh, |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 286 | int *batch_count, transaction_t *transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 287 | { |
| 288 | struct buffer_head *bh = jh2bh(jh); |
| 289 | int ret = 0; |
| 290 | |
| 291 | if (buffer_locked(bh)) { |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 292 | get_bh(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 293 | spin_unlock(&journal->j_list_lock); |
| 294 | jbd_unlock_bh_state(bh); |
| 295 | wait_on_buffer(bh); |
| 296 | /* the journal_head may have gone by now */ |
| 297 | BUFFER_TRACE(bh, "brelse"); |
| 298 | __brelse(bh); |
| 299 | ret = 1; |
| 300 | } else if (jh->b_transaction != NULL) { |
| 301 | transaction_t *t = jh->b_transaction; |
| 302 | tid_t tid = t->t_tid; |
| 303 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 304 | transaction->t_chp_stats.cs_forced_to_close++; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 305 | spin_unlock(&journal->j_list_lock); |
| 306 | jbd_unlock_bh_state(bh); |
Theodore Ts'o | 5c2178e | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 307 | if (unlikely(journal->j_flags & JBD2_UNMOUNT)) |
| 308 | /* |
| 309 | * The journal thread is dead; so starting and |
| 310 | * waiting for a commit to finish will cause |
| 311 | * us to wait for a _very_ long time. |
| 312 | */ |
| 313 | printk(KERN_ERR "JBD2: %s: " |
| 314 | "Waiting for Godot: block %llu\n", |
| 315 | journal->j_devname, |
| 316 | (unsigned long long) bh->b_blocknr); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 317 | jbd2_log_start_commit(journal, tid); |
| 318 | jbd2_log_wait_commit(journal, tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 319 | ret = 1; |
| 320 | } else if (!buffer_dirty(bh)) { |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 321 | ret = 1; |
| 322 | if (unlikely(buffer_write_io_error(bh))) |
| 323 | ret = -EIO; |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 324 | get_bh(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 325 | J_ASSERT_JH(jh, !buffer_jbddirty(bh)); |
| 326 | BUFFER_TRACE(bh, "remove from checkpoint"); |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 327 | __jbd2_journal_remove_checkpoint(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 328 | spin_unlock(&journal->j_list_lock); |
| 329 | jbd_unlock_bh_state(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 330 | __brelse(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 331 | } else { |
| 332 | /* |
| 333 | * Important: we are about to write the buffer, and |
| 334 | * possibly block, while still holding the journal lock. |
| 335 | * We cannot afford to let the transaction logic start |
| 336 | * messing around with this buffer before we write it to |
| 337 | * disk, as that would break recoverability. |
| 338 | */ |
| 339 | BUFFER_TRACE(bh, "queue"); |
| 340 | get_bh(bh); |
| 341 | J_ASSERT_BH(bh, !buffer_jwrite(bh)); |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 342 | journal->j_chkpt_bhs[*batch_count] = bh; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 343 | __buffer_relink_io(jh); |
| 344 | jbd_unlock_bh_state(bh); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 345 | transaction->t_chp_stats.cs_written++; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 346 | (*batch_count)++; |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 347 | if (*batch_count == JBD2_NR_BATCH) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 348 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 349 | __flush_batch(journal, batch_count); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 350 | ret = 1; |
| 351 | } |
| 352 | } |
| 353 | return ret; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * Perform an actual checkpoint. We take the first transaction on the |
| 358 | * list of transactions to be checkpointed and send all its buffers |
| 359 | * to disk. We submit larger chunks of data at once. |
| 360 | * |
| 361 | * The journal should be locked before calling this function. |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 362 | * Called with j_checkpoint_mutex held. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 363 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 364 | int jbd2_log_do_checkpoint(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 365 | { |
| 366 | transaction_t *transaction; |
| 367 | tid_t this_tid; |
| 368 | int result; |
| 369 | |
| 370 | jbd_debug(1, "Start checkpoint\n"); |
| 371 | |
| 372 | /* |
| 373 | * First thing: if there are any transactions in the log which |
| 374 | * don't need checkpointing, just eliminate them from the |
| 375 | * journal straight away. |
| 376 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 377 | result = jbd2_cleanup_journal_tail(journal); |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 378 | trace_jbd2_checkpoint(journal, result); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 379 | jbd_debug(1, "cleanup_journal_tail returned %d\n", result); |
| 380 | if (result <= 0) |
| 381 | return result; |
| 382 | |
| 383 | /* |
| 384 | * OK, we need to start writing disk blocks. Take one transaction |
| 385 | * and write it. |
| 386 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 387 | result = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 388 | spin_lock(&journal->j_list_lock); |
| 389 | if (!journal->j_checkpoint_transactions) |
| 390 | goto out; |
| 391 | transaction = journal->j_checkpoint_transactions; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 392 | if (transaction->t_chp_stats.cs_chp_time == 0) |
| 393 | transaction->t_chp_stats.cs_chp_time = jiffies; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 394 | this_tid = transaction->t_tid; |
| 395 | restart: |
| 396 | /* |
| 397 | * If someone cleaned up this transaction while we slept, we're |
| 398 | * done (maybe it's a new transaction, but it fell at the same |
| 399 | * address). |
| 400 | */ |
| 401 | if (journal->j_checkpoint_transactions == transaction && |
| 402 | transaction->t_tid == this_tid) { |
| 403 | int batch_count = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 404 | struct journal_head *jh; |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 405 | int retry = 0, err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 406 | |
| 407 | while (!retry && transaction->t_checkpoint_list) { |
| 408 | struct buffer_head *bh; |
| 409 | |
| 410 | jh = transaction->t_checkpoint_list; |
| 411 | bh = jh2bh(jh); |
| 412 | if (!jbd_trylock_bh_state(bh)) { |
| 413 | jbd_sync_bh(journal, bh); |
| 414 | retry = 1; |
| 415 | break; |
| 416 | } |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 417 | retry = __process_buffer(journal, jh, &batch_count, |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 418 | transaction); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 419 | if (retry < 0 && !result) |
| 420 | result = retry; |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 421 | if (!retry && (need_resched() || |
| 422 | spin_needbreak(&journal->j_list_lock))) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 423 | spin_unlock(&journal->j_list_lock); |
| 424 | retry = 1; |
| 425 | break; |
| 426 | } |
| 427 | } |
| 428 | |
| 429 | if (batch_count) { |
| 430 | if (!retry) { |
| 431 | spin_unlock(&journal->j_list_lock); |
| 432 | retry = 1; |
| 433 | } |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 434 | __flush_batch(journal, &batch_count); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 435 | } |
| 436 | |
| 437 | if (retry) { |
| 438 | spin_lock(&journal->j_list_lock); |
| 439 | goto restart; |
| 440 | } |
| 441 | /* |
| 442 | * Now we have cleaned up the first transaction's checkpoint |
| 443 | * list. Let's clean up the second one |
| 444 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 445 | err = __wait_cp_io(journal, transaction); |
| 446 | if (!result) |
| 447 | result = err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 448 | } |
| 449 | out: |
| 450 | spin_unlock(&journal->j_list_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 451 | if (result < 0) |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 452 | jbd2_journal_abort(journal, result); |
| 453 | else |
| 454 | result = jbd2_cleanup_journal_tail(journal); |
| 455 | |
| 456 | return (result < 0) ? result : 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 457 | } |
| 458 | |
| 459 | /* |
| 460 | * Check the list of checkpoint transactions for the journal to see if |
| 461 | * we have already got rid of any since the last update of the log tail |
| 462 | * in the journal superblock. If so, we can instantly roll the |
| 463 | * superblock forward to remove those transactions from the log. |
| 464 | * |
| 465 | * Return <0 on error, 0 on success, 1 if there was nothing to clean up. |
| 466 | * |
| 467 | * Called with the journal lock held. |
| 468 | * |
| 469 | * This is the only part of the journaling code which really needs to be |
| 470 | * aware of transaction aborts. Checkpointing involves writing to the |
| 471 | * main filesystem area rather than to the journal, so it can proceed |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 472 | * even in abort state, but we must not update the super block if |
| 473 | * checkpointing may have failed. Otherwise, we would lose some metadata |
| 474 | * buffers which should be written-back to the filesystem. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 475 | */ |
| 476 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 477 | int jbd2_cleanup_journal_tail(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 478 | { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 479 | tid_t first_tid; |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 480 | unsigned long blocknr; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 481 | |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 482 | if (is_journal_aborted(journal)) |
| 483 | return 1; |
| 484 | |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 485 | if (!jbd2_journal_get_log_tail(journal, &first_tid, &blocknr)) |
| 486 | return 1; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 487 | J_ASSERT(blocknr != 0); |
| 488 | |
Theodore Ts'o | cc3e1be | 2009-12-23 06:52:08 -0500 | [diff] [blame] | 489 | /* |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 490 | * We need to make sure that any blocks that were recently written out |
| 491 | * --- perhaps by jbd2_log_do_checkpoint() --- are flushed out before |
| 492 | * we drop the transactions from the journal. It's unlikely this will |
| 493 | * be necessary, especially with an appropriately sized journal, but we |
| 494 | * need this to guarantee correctness. Fortunately |
| 495 | * jbd2_cleanup_journal_tail() doesn't get called all that often. |
Theodore Ts'o | cc3e1be | 2009-12-23 06:52:08 -0500 | [diff] [blame] | 496 | */ |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 497 | if (journal->j_flags & JBD2_BARRIER) |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 498 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL); |
Jan Kara | 79feb52 | 2012-03-13 22:22:54 -0400 | [diff] [blame] | 499 | |
| 500 | __jbd2_update_log_tail(journal, first_tid, blocknr); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 501 | return 0; |
| 502 | } |
| 503 | |
| 504 | |
| 505 | /* Checkpoint list management */ |
| 506 | |
| 507 | /* |
| 508 | * journal_clean_one_cp_list |
| 509 | * |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 510 | * Find all the written-back checkpoint buffers in the given list and |
| 511 | * release them. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 512 | * |
| 513 | * Called with the journal locked. |
| 514 | * Called with j_list_lock held. |
Paul Bolle | 90802ed | 2011-12-05 13:00:34 +0100 | [diff] [blame] | 515 | * Returns number of buffers reaped (for debug) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 516 | */ |
| 517 | |
| 518 | static int journal_clean_one_cp_list(struct journal_head *jh, int *released) |
| 519 | { |
| 520 | struct journal_head *last_jh; |
| 521 | struct journal_head *next_jh = jh; |
| 522 | int ret, freed = 0; |
| 523 | |
| 524 | *released = 0; |
| 525 | if (!jh) |
| 526 | return 0; |
| 527 | |
| 528 | last_jh = jh->b_cpprev; |
| 529 | do { |
| 530 | jh = next_jh; |
| 531 | next_jh = jh->b_cpnext; |
| 532 | /* Use trylock because of the ranking */ |
| 533 | if (jbd_trylock_bh_state(jh2bh(jh))) { |
| 534 | ret = __try_to_free_cp_buf(jh); |
| 535 | if (ret) { |
| 536 | freed++; |
| 537 | if (ret == 2) { |
| 538 | *released = 1; |
| 539 | return freed; |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | /* |
| 544 | * This function only frees up some memory |
| 545 | * if possible so we dont have an obligation |
| 546 | * to finish processing. Bail out if preemption |
| 547 | * requested: |
| 548 | */ |
| 549 | if (need_resched()) |
| 550 | return freed; |
| 551 | } while (jh != last_jh); |
| 552 | |
| 553 | return freed; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * journal_clean_checkpoint_list |
| 558 | * |
| 559 | * Find all the written-back checkpoint buffers in the journal and release them. |
| 560 | * |
| 561 | * Called with the journal locked. |
| 562 | * Called with j_list_lock held. |
| 563 | * Returns number of buffers reaped (for debug) |
| 564 | */ |
| 565 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 566 | int __jbd2_journal_clean_checkpoint_list(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 567 | { |
| 568 | transaction_t *transaction, *last_transaction, *next_transaction; |
| 569 | int ret = 0; |
| 570 | int released; |
| 571 | |
| 572 | transaction = journal->j_checkpoint_transactions; |
| 573 | if (!transaction) |
| 574 | goto out; |
| 575 | |
| 576 | last_transaction = transaction->t_cpprev; |
| 577 | next_transaction = transaction; |
| 578 | do { |
| 579 | transaction = next_transaction; |
| 580 | next_transaction = transaction->t_cpnext; |
| 581 | ret += journal_clean_one_cp_list(transaction-> |
| 582 | t_checkpoint_list, &released); |
| 583 | /* |
| 584 | * This function only frees up some memory if possible so we |
| 585 | * dont have an obligation to finish processing. Bail out if |
| 586 | * preemption requested: |
| 587 | */ |
| 588 | if (need_resched()) |
| 589 | goto out; |
| 590 | if (released) |
| 591 | continue; |
| 592 | /* |
| 593 | * It is essential that we are as careful as in the case of |
| 594 | * t_checkpoint_list with removing the buffer from the list as |
| 595 | * we can possibly see not yet submitted buffers on io_list |
| 596 | */ |
| 597 | ret += journal_clean_one_cp_list(transaction-> |
| 598 | t_checkpoint_io_list, &released); |
| 599 | if (need_resched()) |
| 600 | goto out; |
| 601 | } while (transaction != last_transaction); |
| 602 | out: |
| 603 | return ret; |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * journal_remove_checkpoint: called after a buffer has been committed |
| 608 | * to disk (either by being write-back flushed to disk, or being |
| 609 | * committed to the log). |
| 610 | * |
| 611 | * We cannot safely clean a transaction out of the log until all of the |
| 612 | * buffer updates committed in that transaction have safely been stored |
| 613 | * elsewhere on disk. To achieve this, all of the buffers in a |
| 614 | * transaction need to be maintained on the transaction's checkpoint |
| 615 | * lists until they have been rewritten, at which point this function is |
| 616 | * called to remove the buffer from the existing transaction's |
| 617 | * checkpoint lists. |
| 618 | * |
| 619 | * The function returns 1 if it frees the transaction, 0 otherwise. |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 620 | * The function can free jh and bh. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 621 | * |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 622 | * This function is called with j_list_lock held. |
| 623 | * This function is called with jbd_lock_bh_state(jh2bh(jh)) |
| 624 | */ |
| 625 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 626 | int __jbd2_journal_remove_checkpoint(struct journal_head *jh) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 627 | { |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 628 | struct transaction_chp_stats_s *stats; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 629 | transaction_t *transaction; |
| 630 | journal_t *journal; |
| 631 | int ret = 0; |
| 632 | |
| 633 | JBUFFER_TRACE(jh, "entry"); |
| 634 | |
| 635 | if ((transaction = jh->b_cp_transaction) == NULL) { |
| 636 | JBUFFER_TRACE(jh, "not on transaction"); |
| 637 | goto out; |
| 638 | } |
| 639 | journal = transaction->t_journal; |
| 640 | |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 641 | JBUFFER_TRACE(jh, "removing from transaction"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 642 | __buffer_unlink(jh); |
| 643 | jh->b_cp_transaction = NULL; |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 644 | jbd2_journal_put_journal_head(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 645 | |
| 646 | if (transaction->t_checkpoint_list != NULL || |
| 647 | transaction->t_checkpoint_io_list != NULL) |
| 648 | goto out; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 649 | |
| 650 | /* |
| 651 | * There is one special case to worry about: if we have just pulled the |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 652 | * buffer off a running or committing transaction's checkpoing list, |
| 653 | * then even if the checkpoint list is empty, the transaction obviously |
| 654 | * cannot be dropped! |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 655 | * |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 656 | * The locking here around t_state is a bit sleazy. |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 657 | * See the comment at the end of jbd2_journal_commit_transaction(). |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 658 | */ |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 659 | if (transaction->t_state != T_FINISHED) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 660 | goto out; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 661 | |
| 662 | /* OK, that was the last buffer for the transaction: we can now |
| 663 | safely remove this transaction from the log */ |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 664 | stats = &transaction->t_chp_stats; |
| 665 | if (stats->cs_chp_time) |
| 666 | stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time, |
| 667 | jiffies); |
| 668 | trace_jbd2_checkpoint_stats(journal->j_fs_dev->bd_dev, |
| 669 | transaction->t_tid, stats); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 670 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 671 | __jbd2_journal_drop_transaction(journal, transaction); |
Yongqiang Yang | 0c2022e | 2012-02-20 17:53:02 -0500 | [diff] [blame] | 672 | jbd2_journal_free_transaction(transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 673 | |
| 674 | /* Just in case anybody was waiting for more transactions to be |
| 675 | checkpointed... */ |
| 676 | wake_up(&journal->j_wait_logspace); |
| 677 | ret = 1; |
| 678 | out: |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 679 | return ret; |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * journal_insert_checkpoint: put a committed buffer onto a checkpoint |
| 684 | * list so that we know when it is safe to clean the transaction out of |
| 685 | * the log. |
| 686 | * |
| 687 | * Called with the journal locked. |
| 688 | * Called with j_list_lock held. |
| 689 | */ |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 690 | void __jbd2_journal_insert_checkpoint(struct journal_head *jh, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 691 | transaction_t *transaction) |
| 692 | { |
| 693 | JBUFFER_TRACE(jh, "entry"); |
| 694 | J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh))); |
| 695 | J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); |
| 696 | |
Jan Kara | de1b794 | 2011-06-13 15:38:22 -0400 | [diff] [blame] | 697 | /* Get reference for checkpointing transaction */ |
| 698 | jbd2_journal_grab_journal_head(jh2bh(jh)); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 699 | jh->b_cp_transaction = transaction; |
| 700 | |
| 701 | if (!transaction->t_checkpoint_list) { |
| 702 | jh->b_cpnext = jh->b_cpprev = jh; |
| 703 | } else { |
| 704 | jh->b_cpnext = transaction->t_checkpoint_list; |
| 705 | jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev; |
| 706 | jh->b_cpprev->b_cpnext = jh; |
| 707 | jh->b_cpnext->b_cpprev = jh; |
| 708 | } |
| 709 | transaction->t_checkpoint_list = jh; |
| 710 | } |
| 711 | |
| 712 | /* |
| 713 | * We've finished with this transaction structure: adios... |
| 714 | * |
| 715 | * The transaction must have no links except for the checkpoint by this |
| 716 | * point. |
| 717 | * |
| 718 | * Called with the journal locked. |
| 719 | * Called with j_list_lock held. |
| 720 | */ |
| 721 | |
Mingming Cao | f7f4bcc | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 722 | void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 723 | { |
| 724 | assert_spin_locked(&journal->j_list_lock); |
| 725 | if (transaction->t_cpnext) { |
| 726 | transaction->t_cpnext->t_cpprev = transaction->t_cpprev; |
| 727 | transaction->t_cpprev->t_cpnext = transaction->t_cpnext; |
| 728 | if (journal->j_checkpoint_transactions == transaction) |
| 729 | journal->j_checkpoint_transactions = |
| 730 | transaction->t_cpnext; |
| 731 | if (journal->j_checkpoint_transactions == transaction) |
| 732 | journal->j_checkpoint_transactions = NULL; |
| 733 | } |
| 734 | |
| 735 | J_ASSERT(transaction->t_state == T_FINISHED); |
| 736 | J_ASSERT(transaction->t_buffers == NULL); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 737 | J_ASSERT(transaction->t_forget == NULL); |
| 738 | J_ASSERT(transaction->t_iobuf_list == NULL); |
| 739 | J_ASSERT(transaction->t_shadow_list == NULL); |
| 740 | J_ASSERT(transaction->t_log_list == NULL); |
| 741 | J_ASSERT(transaction->t_checkpoint_list == NULL); |
| 742 | J_ASSERT(transaction->t_checkpoint_io_list == NULL); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 743 | J_ASSERT(atomic_read(&transaction->t_updates) == 0); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 744 | J_ASSERT(journal->j_committing_transaction != transaction); |
| 745 | J_ASSERT(journal->j_running_transaction != transaction); |
| 746 | |
Seiji Aguchi | 2201c59 | 2012-02-20 17:53:01 -0500 | [diff] [blame] | 747 | trace_jbd2_drop_transaction(journal, transaction); |
| 748 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 749 | jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 750 | } |