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 | f7f4bccb | 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)) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 100 | JBUFFER_TRACE(jh, "remove from checkpoint list"); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 101 | ret = __jbd2_journal_remove_checkpoint(jh) + 1; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 102 | jbd_unlock_bh_state(bh); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 103 | jbd2_journal_remove_journal_head(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 104 | BUFFER_TRACE(bh, "release"); |
| 105 | __brelse(bh); |
| 106 | } else { |
| 107 | jbd_unlock_bh_state(bh); |
| 108 | } |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | /* |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 113 | * __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] | 114 | * |
| 115 | * Called under j-state_lock *only*. It will be unlocked if we have to wait |
| 116 | * for a checkpoint to free up some space in the log. |
| 117 | */ |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 118 | void __jbd2_log_wait_for_space(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 119 | { |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 120 | int nblocks, space_left; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 121 | /* assert_spin_locked(&journal->j_state_lock); */ |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 122 | |
| 123 | nblocks = jbd_space_needed(journal); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 124 | while (__jbd2_log_space_left(journal) < nblocks) { |
| 125 | if (journal->j_flags & JBD2_ABORT) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 126 | return; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 127 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 128 | mutex_lock(&journal->j_checkpoint_mutex); |
| 129 | |
| 130 | /* |
| 131 | * Test again, another process may have checkpointed while we |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 132 | * were waiting for the checkpoint lock. If there are no |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 133 | * transactions ready to be checkpointed, try to recover |
| 134 | * journal space by calling cleanup_journal_tail(), and if |
| 135 | * that doesn't work, by waiting for the currently committing |
| 136 | * transaction to complete. If there is absolutely no way |
| 137 | * to make progress, this is either a BUG or corrupted |
| 138 | * filesystem, so abort the journal and leave a stack |
| 139 | * trace for forensic evidence. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 140 | */ |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 141 | write_lock(&journal->j_state_lock); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 142 | spin_lock(&journal->j_list_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 143 | nblocks = jbd_space_needed(journal); |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 144 | space_left = __jbd2_log_space_left(journal); |
| 145 | if (space_left < nblocks) { |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 146 | int chkpt = journal->j_checkpoint_transactions != NULL; |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 147 | tid_t tid = 0; |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 148 | |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 149 | if (journal->j_committing_transaction) |
| 150 | tid = journal->j_committing_transaction->t_tid; |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 151 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 152 | write_unlock(&journal->j_state_lock); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 153 | if (chkpt) { |
| 154 | jbd2_log_do_checkpoint(journal); |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 155 | } else if (jbd2_cleanup_journal_tail(journal) == 0) { |
| 156 | /* We were able to recover space; yay! */ |
| 157 | ; |
| 158 | } else if (tid) { |
| 159 | jbd2_log_wait_commit(journal, tid); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 160 | } else { |
Theodore Ts'o | 8c3f25d | 2008-11-06 22:38:07 -0500 | [diff] [blame] | 161 | printk(KERN_ERR "%s: needed %d blocks and " |
| 162 | "only had %d space available\n", |
| 163 | __func__, nblocks, space_left); |
| 164 | printk(KERN_ERR "%s: no way to get more " |
| 165 | "journal space in %s\n", __func__, |
| 166 | journal->j_devname); |
| 167 | WARN_ON(1); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 168 | jbd2_journal_abort(journal, 0); |
| 169 | } |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 170 | write_lock(&journal->j_state_lock); |
Duane Griffin | 23f8b79 | 2008-10-08 23:28:31 -0400 | [diff] [blame] | 171 | } else { |
| 172 | spin_unlock(&journal->j_list_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 173 | } |
| 174 | mutex_unlock(&journal->j_checkpoint_mutex); |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* |
| 179 | * We were unable to perform jbd_trylock_bh_state() inside j_list_lock. |
| 180 | * The caller must restart a list walk. Wait for someone else to run |
| 181 | * jbd_unlock_bh_state(). |
| 182 | */ |
| 183 | static void jbd_sync_bh(journal_t *journal, struct buffer_head *bh) |
| 184 | __releases(journal->j_list_lock) |
| 185 | { |
| 186 | get_bh(bh); |
| 187 | spin_unlock(&journal->j_list_lock); |
| 188 | jbd_lock_bh_state(bh); |
| 189 | jbd_unlock_bh_state(bh); |
| 190 | put_bh(bh); |
| 191 | } |
| 192 | |
| 193 | /* |
| 194 | * Clean up transaction's list of buffers submitted for io. |
| 195 | * We wait for any pending IO to complete and remove any clean |
| 196 | * buffers. Note that we take the buffers in the opposite ordering |
| 197 | * from the one in which they were submitted for IO. |
| 198 | * |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 199 | * Return 0 on success, and return <0 if some buffers have failed |
| 200 | * to be written out. |
| 201 | * |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 202 | * Called with j_list_lock held. |
| 203 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 204 | static int __wait_cp_io(journal_t *journal, transaction_t *transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 205 | { |
| 206 | struct journal_head *jh; |
| 207 | struct buffer_head *bh; |
| 208 | tid_t this_tid; |
| 209 | int released = 0; |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 210 | int ret = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 211 | |
| 212 | this_tid = transaction->t_tid; |
| 213 | restart: |
| 214 | /* Did somebody clean up the transaction in the meanwhile? */ |
| 215 | if (journal->j_checkpoint_transactions != transaction || |
| 216 | transaction->t_tid != this_tid) |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 217 | return ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 218 | while (!released && transaction->t_checkpoint_io_list) { |
| 219 | jh = transaction->t_checkpoint_io_list; |
| 220 | bh = jh2bh(jh); |
| 221 | if (!jbd_trylock_bh_state(bh)) { |
| 222 | jbd_sync_bh(journal, bh); |
| 223 | spin_lock(&journal->j_list_lock); |
| 224 | goto restart; |
| 225 | } |
| 226 | if (buffer_locked(bh)) { |
| 227 | atomic_inc(&bh->b_count); |
| 228 | spin_unlock(&journal->j_list_lock); |
| 229 | jbd_unlock_bh_state(bh); |
| 230 | wait_on_buffer(bh); |
| 231 | /* the journal_head may have gone by now */ |
| 232 | BUFFER_TRACE(bh, "brelse"); |
| 233 | __brelse(bh); |
| 234 | spin_lock(&journal->j_list_lock); |
| 235 | goto restart; |
| 236 | } |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 237 | if (unlikely(buffer_write_io_error(bh))) |
| 238 | ret = -EIO; |
| 239 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 240 | /* |
| 241 | * Now in whatever state the buffer currently is, we know that |
| 242 | * it has been written out and so we can drop it from the list |
| 243 | */ |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 244 | released = __jbd2_journal_remove_checkpoint(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 245 | jbd_unlock_bh_state(bh); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 246 | jbd2_journal_remove_journal_head(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 247 | __brelse(bh); |
| 248 | } |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 249 | |
| 250 | return ret; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 251 | } |
| 252 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 253 | static void |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 254 | __flush_batch(journal_t *journal, int *batch_count) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 255 | { |
| 256 | int i; |
| 257 | |
Christoph Hellwig | 9cb569d | 2010-08-11 17:06:24 +0200 | [diff] [blame] | 258 | for (i = 0; i < *batch_count; i++) |
| 259 | write_dirty_buffer(journal->j_chkpt_bhs[i], WRITE); |
| 260 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 261 | for (i = 0; i < *batch_count; i++) { |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 262 | struct buffer_head *bh = journal->j_chkpt_bhs[i]; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 263 | clear_buffer_jwrite(bh); |
| 264 | BUFFER_TRACE(bh, "brelse"); |
| 265 | __brelse(bh); |
| 266 | } |
| 267 | *batch_count = 0; |
| 268 | } |
| 269 | |
| 270 | /* |
| 271 | * Try to flush one buffer from the checkpoint list to disk. |
| 272 | * |
| 273 | * Return 1 if something happened which requires us to abort the current |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 274 | * scan of the checkpoint list. Return <0 if the buffer has failed to |
| 275 | * be written out. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 276 | * |
| 277 | * Called with j_list_lock held and drops it if 1 is returned |
| 278 | * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it |
| 279 | */ |
| 280 | static int __process_buffer(journal_t *journal, struct journal_head *jh, |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 281 | int *batch_count, transaction_t *transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 282 | { |
| 283 | struct buffer_head *bh = jh2bh(jh); |
| 284 | int ret = 0; |
| 285 | |
| 286 | if (buffer_locked(bh)) { |
| 287 | atomic_inc(&bh->b_count); |
| 288 | spin_unlock(&journal->j_list_lock); |
| 289 | jbd_unlock_bh_state(bh); |
| 290 | wait_on_buffer(bh); |
| 291 | /* the journal_head may have gone by now */ |
| 292 | BUFFER_TRACE(bh, "brelse"); |
| 293 | __brelse(bh); |
| 294 | ret = 1; |
| 295 | } else if (jh->b_transaction != NULL) { |
| 296 | transaction_t *t = jh->b_transaction; |
| 297 | tid_t tid = t->t_tid; |
| 298 | |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 299 | transaction->t_chp_stats.cs_forced_to_close++; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 300 | spin_unlock(&journal->j_list_lock); |
| 301 | jbd_unlock_bh_state(bh); |
Theodore Ts'o | 5c2178e | 2010-10-27 21:30:04 -0400 | [diff] [blame] | 302 | if (unlikely(journal->j_flags & JBD2_UNMOUNT)) |
| 303 | /* |
| 304 | * The journal thread is dead; so starting and |
| 305 | * waiting for a commit to finish will cause |
| 306 | * us to wait for a _very_ long time. |
| 307 | */ |
| 308 | printk(KERN_ERR "JBD2: %s: " |
| 309 | "Waiting for Godot: block %llu\n", |
| 310 | journal->j_devname, |
| 311 | (unsigned long long) bh->b_blocknr); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 312 | jbd2_log_start_commit(journal, tid); |
| 313 | jbd2_log_wait_commit(journal, tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 314 | ret = 1; |
| 315 | } else if (!buffer_dirty(bh)) { |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 316 | ret = 1; |
| 317 | if (unlikely(buffer_write_io_error(bh))) |
| 318 | ret = -EIO; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 319 | J_ASSERT_JH(jh, !buffer_jbddirty(bh)); |
| 320 | BUFFER_TRACE(bh, "remove from checkpoint"); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 321 | __jbd2_journal_remove_checkpoint(jh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 322 | spin_unlock(&journal->j_list_lock); |
| 323 | jbd_unlock_bh_state(bh); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 324 | jbd2_journal_remove_journal_head(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 325 | __brelse(bh); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 326 | } else { |
| 327 | /* |
| 328 | * Important: we are about to write the buffer, and |
| 329 | * possibly block, while still holding the journal lock. |
| 330 | * We cannot afford to let the transaction logic start |
| 331 | * messing around with this buffer before we write it to |
| 332 | * disk, as that would break recoverability. |
| 333 | */ |
| 334 | BUFFER_TRACE(bh, "queue"); |
| 335 | get_bh(bh); |
| 336 | J_ASSERT_BH(bh, !buffer_jwrite(bh)); |
| 337 | set_buffer_jwrite(bh); |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 338 | journal->j_chkpt_bhs[*batch_count] = bh; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 339 | __buffer_relink_io(jh); |
| 340 | jbd_unlock_bh_state(bh); |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 341 | transaction->t_chp_stats.cs_written++; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 342 | (*batch_count)++; |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 343 | if (*batch_count == JBD2_NR_BATCH) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 344 | spin_unlock(&journal->j_list_lock); |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 345 | __flush_batch(journal, batch_count); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 346 | ret = 1; |
| 347 | } |
| 348 | } |
| 349 | return ret; |
| 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Perform an actual checkpoint. We take the first transaction on the |
| 354 | * list of transactions to be checkpointed and send all its buffers |
| 355 | * to disk. We submit larger chunks of data at once. |
| 356 | * |
| 357 | * The journal should be locked before calling this function. |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 358 | * Called with j_checkpoint_mutex held. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 359 | */ |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 360 | int jbd2_log_do_checkpoint(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 361 | { |
| 362 | transaction_t *transaction; |
| 363 | tid_t this_tid; |
| 364 | int result; |
| 365 | |
| 366 | jbd_debug(1, "Start checkpoint\n"); |
| 367 | |
| 368 | /* |
| 369 | * First thing: if there are any transactions in the log which |
| 370 | * don't need checkpointing, just eliminate them from the |
| 371 | * journal straight away. |
| 372 | */ |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 373 | result = jbd2_cleanup_journal_tail(journal); |
Theodore Ts'o | 879c5e6 | 2009-06-17 11:47:48 -0400 | [diff] [blame] | 374 | trace_jbd2_checkpoint(journal, result); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 375 | jbd_debug(1, "cleanup_journal_tail returned %d\n", result); |
| 376 | if (result <= 0) |
| 377 | return result; |
| 378 | |
| 379 | /* |
| 380 | * OK, we need to start writing disk blocks. Take one transaction |
| 381 | * and write it. |
| 382 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 383 | result = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 384 | spin_lock(&journal->j_list_lock); |
| 385 | if (!journal->j_checkpoint_transactions) |
| 386 | goto out; |
| 387 | transaction = journal->j_checkpoint_transactions; |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 388 | if (transaction->t_chp_stats.cs_chp_time == 0) |
| 389 | transaction->t_chp_stats.cs_chp_time = jiffies; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 390 | this_tid = transaction->t_tid; |
| 391 | restart: |
| 392 | /* |
| 393 | * If someone cleaned up this transaction while we slept, we're |
| 394 | * done (maybe it's a new transaction, but it fell at the same |
| 395 | * address). |
| 396 | */ |
| 397 | if (journal->j_checkpoint_transactions == transaction && |
| 398 | transaction->t_tid == this_tid) { |
| 399 | int batch_count = 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 400 | struct journal_head *jh; |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 401 | int retry = 0, err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 402 | |
| 403 | while (!retry && transaction->t_checkpoint_list) { |
| 404 | struct buffer_head *bh; |
| 405 | |
| 406 | jh = transaction->t_checkpoint_list; |
| 407 | bh = jh2bh(jh); |
| 408 | if (!jbd_trylock_bh_state(bh)) { |
| 409 | jbd_sync_bh(journal, bh); |
| 410 | retry = 1; |
| 411 | break; |
| 412 | } |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 413 | retry = __process_buffer(journal, jh, &batch_count, |
Johann Lombardi | 8e85fb3 | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 414 | transaction); |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 415 | if (retry < 0 && !result) |
| 416 | result = retry; |
Nick Piggin | 95c354f | 2008-01-30 13:31:20 +0100 | [diff] [blame] | 417 | if (!retry && (need_resched() || |
| 418 | spin_needbreak(&journal->j_list_lock))) { |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 419 | spin_unlock(&journal->j_list_lock); |
| 420 | retry = 1; |
| 421 | break; |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | if (batch_count) { |
| 426 | if (!retry) { |
| 427 | spin_unlock(&journal->j_list_lock); |
| 428 | retry = 1; |
| 429 | } |
Theodore Ts'o | 1a0d378 | 2008-11-05 00:09:22 -0500 | [diff] [blame] | 430 | __flush_batch(journal, &batch_count); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 431 | } |
| 432 | |
| 433 | if (retry) { |
| 434 | spin_lock(&journal->j_list_lock); |
| 435 | goto restart; |
| 436 | } |
| 437 | /* |
| 438 | * Now we have cleaned up the first transaction's checkpoint |
| 439 | * list. Let's clean up the second one |
| 440 | */ |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 441 | err = __wait_cp_io(journal, transaction); |
| 442 | if (!result) |
| 443 | result = err; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 444 | } |
| 445 | out: |
| 446 | spin_unlock(&journal->j_list_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 447 | if (result < 0) |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 448 | jbd2_journal_abort(journal, result); |
| 449 | else |
| 450 | result = jbd2_cleanup_journal_tail(journal); |
| 451 | |
| 452 | return (result < 0) ? result : 0; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | /* |
| 456 | * Check the list of checkpoint transactions for the journal to see if |
| 457 | * we have already got rid of any since the last update of the log tail |
| 458 | * in the journal superblock. If so, we can instantly roll the |
| 459 | * superblock forward to remove those transactions from the log. |
| 460 | * |
| 461 | * Return <0 on error, 0 on success, 1 if there was nothing to clean up. |
| 462 | * |
| 463 | * Called with the journal lock held. |
| 464 | * |
| 465 | * This is the only part of the journaling code which really needs to be |
| 466 | * aware of transaction aborts. Checkpointing involves writing to the |
| 467 | * main filesystem area rather than to the journal, so it can proceed |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 468 | * even in abort state, but we must not update the super block if |
| 469 | * checkpointing may have failed. Otherwise, we would lose some metadata |
| 470 | * buffers which should be written-back to the filesystem. |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 471 | */ |
| 472 | |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 473 | int jbd2_cleanup_journal_tail(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 474 | { |
| 475 | transaction_t * transaction; |
| 476 | tid_t first_tid; |
| 477 | unsigned long blocknr, freed; |
| 478 | |
Hidehiro Kawai | 44519fa | 2008-10-10 20:29:13 -0400 | [diff] [blame] | 479 | if (is_journal_aborted(journal)) |
| 480 | return 1; |
| 481 | |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 482 | /* OK, work out the oldest transaction remaining in the log, and |
| 483 | * the log block it starts at. |
| 484 | * |
| 485 | * If the log is now empty, we need to work out which is the |
| 486 | * next transaction ID we will write, and where it will |
| 487 | * start. */ |
| 488 | |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 489 | write_lock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 490 | spin_lock(&journal->j_list_lock); |
| 491 | transaction = journal->j_checkpoint_transactions; |
| 492 | if (transaction) { |
| 493 | first_tid = transaction->t_tid; |
| 494 | blocknr = transaction->t_log_start; |
| 495 | } else if ((transaction = journal->j_committing_transaction) != NULL) { |
| 496 | first_tid = transaction->t_tid; |
| 497 | blocknr = transaction->t_log_start; |
| 498 | } else if ((transaction = journal->j_running_transaction) != NULL) { |
| 499 | first_tid = transaction->t_tid; |
| 500 | blocknr = journal->j_head; |
| 501 | } else { |
| 502 | first_tid = journal->j_transaction_sequence; |
| 503 | blocknr = journal->j_head; |
| 504 | } |
| 505 | spin_unlock(&journal->j_list_lock); |
| 506 | J_ASSERT(blocknr != 0); |
| 507 | |
| 508 | /* If the oldest pinned transaction is at the tail of the log |
| 509 | already then there's not much we can do right now. */ |
| 510 | if (journal->j_tail_sequence == first_tid) { |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 511 | write_unlock(&journal->j_state_lock); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 512 | return 1; |
| 513 | } |
| 514 | |
| 515 | /* OK, update the superblock to recover the freed space. |
| 516 | * Physical blocks come first: have we wrapped beyond the end of |
| 517 | * the log? */ |
| 518 | freed = blocknr - journal->j_tail; |
| 519 | if (blocknr < journal->j_tail) |
| 520 | freed = freed + journal->j_last - journal->j_first; |
| 521 | |
Theodore Ts'o | 71f2be2 | 2009-12-23 07:45:44 -0500 | [diff] [blame] | 522 | trace_jbd2_cleanup_journal_tail(journal, first_tid, blocknr, freed); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 523 | jbd_debug(1, |
| 524 | "Cleaning journal tail from %d to %d (offset %lu), " |
| 525 | "freeing %lu\n", |
| 526 | journal->j_tail_sequence, first_tid, blocknr, freed); |
| 527 | |
| 528 | journal->j_free += freed; |
| 529 | journal->j_tail_sequence = first_tid; |
| 530 | journal->j_tail = blocknr; |
Theodore Ts'o | a931da6 | 2010-08-03 21:35:12 -0400 | [diff] [blame] | 531 | write_unlock(&journal->j_state_lock); |
Theodore Ts'o | cc3e1be | 2009-12-23 06:52:08 -0500 | [diff] [blame] | 532 | |
| 533 | /* |
| 534 | * If there is an external journal, we need to make sure that |
| 535 | * any data blocks that were recently written out --- perhaps |
| 536 | * by jbd2_log_do_checkpoint() --- are flushed out before we |
| 537 | * drop the transactions from the external journal. It's |
| 538 | * unlikely this will be necessary, especially with a |
| 539 | * appropriately sized journal, but we need this to guarantee |
| 540 | * correctness. Fortunately jbd2_cleanup_journal_tail() |
| 541 | * doesn't get called all that often. |
| 542 | */ |
| 543 | if ((journal->j_fs_dev != journal->j_dev) && |
| 544 | (journal->j_flags & JBD2_BARRIER)) |
Christoph Hellwig | dd3932e | 2010-09-16 20:51:46 +0200 | [diff] [blame] | 545 | blkdev_issue_flush(journal->j_fs_dev, GFP_KERNEL, NULL); |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 546 | if (!(journal->j_flags & JBD2_ABORT)) |
| 547 | jbd2_journal_update_superblock(journal, 1); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 548 | return 0; |
| 549 | } |
| 550 | |
| 551 | |
| 552 | /* Checkpoint list management */ |
| 553 | |
| 554 | /* |
| 555 | * journal_clean_one_cp_list |
| 556 | * |
| 557 | * Find all the written-back checkpoint buffers in the given list and release them. |
| 558 | * |
| 559 | * Called with the journal locked. |
| 560 | * Called with j_list_lock held. |
| 561 | * Returns number of bufers reaped (for debug) |
| 562 | */ |
| 563 | |
| 564 | static int journal_clean_one_cp_list(struct journal_head *jh, int *released) |
| 565 | { |
| 566 | struct journal_head *last_jh; |
| 567 | struct journal_head *next_jh = jh; |
| 568 | int ret, freed = 0; |
| 569 | |
| 570 | *released = 0; |
| 571 | if (!jh) |
| 572 | return 0; |
| 573 | |
| 574 | last_jh = jh->b_cpprev; |
| 575 | do { |
| 576 | jh = next_jh; |
| 577 | next_jh = jh->b_cpnext; |
| 578 | /* Use trylock because of the ranking */ |
| 579 | if (jbd_trylock_bh_state(jh2bh(jh))) { |
| 580 | ret = __try_to_free_cp_buf(jh); |
| 581 | if (ret) { |
| 582 | freed++; |
| 583 | if (ret == 2) { |
| 584 | *released = 1; |
| 585 | return freed; |
| 586 | } |
| 587 | } |
| 588 | } |
| 589 | /* |
| 590 | * This function only frees up some memory |
| 591 | * if possible so we dont have an obligation |
| 592 | * to finish processing. Bail out if preemption |
| 593 | * requested: |
| 594 | */ |
| 595 | if (need_resched()) |
| 596 | return freed; |
| 597 | } while (jh != last_jh); |
| 598 | |
| 599 | return freed; |
| 600 | } |
| 601 | |
| 602 | /* |
| 603 | * journal_clean_checkpoint_list |
| 604 | * |
| 605 | * Find all the written-back checkpoint buffers in the journal and release them. |
| 606 | * |
| 607 | * Called with the journal locked. |
| 608 | * Called with j_list_lock held. |
| 609 | * Returns number of buffers reaped (for debug) |
| 610 | */ |
| 611 | |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 612 | int __jbd2_journal_clean_checkpoint_list(journal_t *journal) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 613 | { |
| 614 | transaction_t *transaction, *last_transaction, *next_transaction; |
| 615 | int ret = 0; |
| 616 | int released; |
| 617 | |
| 618 | transaction = journal->j_checkpoint_transactions; |
| 619 | if (!transaction) |
| 620 | goto out; |
| 621 | |
| 622 | last_transaction = transaction->t_cpprev; |
| 623 | next_transaction = transaction; |
| 624 | do { |
| 625 | transaction = next_transaction; |
| 626 | next_transaction = transaction->t_cpnext; |
| 627 | ret += journal_clean_one_cp_list(transaction-> |
| 628 | t_checkpoint_list, &released); |
| 629 | /* |
| 630 | * This function only frees up some memory if possible so we |
| 631 | * dont have an obligation to finish processing. Bail out if |
| 632 | * preemption requested: |
| 633 | */ |
| 634 | if (need_resched()) |
| 635 | goto out; |
| 636 | if (released) |
| 637 | continue; |
| 638 | /* |
| 639 | * It is essential that we are as careful as in the case of |
| 640 | * t_checkpoint_list with removing the buffer from the list as |
| 641 | * we can possibly see not yet submitted buffers on io_list |
| 642 | */ |
| 643 | ret += journal_clean_one_cp_list(transaction-> |
| 644 | t_checkpoint_io_list, &released); |
| 645 | if (need_resched()) |
| 646 | goto out; |
| 647 | } while (transaction != last_transaction); |
| 648 | out: |
| 649 | return ret; |
| 650 | } |
| 651 | |
| 652 | /* |
| 653 | * journal_remove_checkpoint: called after a buffer has been committed |
| 654 | * to disk (either by being write-back flushed to disk, or being |
| 655 | * committed to the log). |
| 656 | * |
| 657 | * We cannot safely clean a transaction out of the log until all of the |
| 658 | * buffer updates committed in that transaction have safely been stored |
| 659 | * elsewhere on disk. To achieve this, all of the buffers in a |
| 660 | * transaction need to be maintained on the transaction's checkpoint |
| 661 | * lists until they have been rewritten, at which point this function is |
| 662 | * called to remove the buffer from the existing transaction's |
| 663 | * checkpoint lists. |
| 664 | * |
| 665 | * The function returns 1 if it frees the transaction, 0 otherwise. |
| 666 | * |
| 667 | * This function is called with the journal locked. |
| 668 | * This function is called with j_list_lock held. |
| 669 | * This function is called with jbd_lock_bh_state(jh2bh(jh)) |
| 670 | */ |
| 671 | |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 672 | int __jbd2_journal_remove_checkpoint(struct journal_head *jh) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 673 | { |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 674 | struct transaction_chp_stats_s *stats; |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 675 | transaction_t *transaction; |
| 676 | journal_t *journal; |
| 677 | int ret = 0; |
| 678 | |
| 679 | JBUFFER_TRACE(jh, "entry"); |
| 680 | |
| 681 | if ((transaction = jh->b_cp_transaction) == NULL) { |
| 682 | JBUFFER_TRACE(jh, "not on transaction"); |
| 683 | goto out; |
| 684 | } |
| 685 | journal = transaction->t_journal; |
| 686 | |
| 687 | __buffer_unlink(jh); |
| 688 | jh->b_cp_transaction = NULL; |
| 689 | |
| 690 | if (transaction->t_checkpoint_list != NULL || |
| 691 | transaction->t_checkpoint_io_list != NULL) |
| 692 | goto out; |
| 693 | JBUFFER_TRACE(jh, "transaction has no more buffers"); |
| 694 | |
| 695 | /* |
| 696 | * 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] | 697 | * buffer off a running or committing transaction's checkpoing list, |
| 698 | * then even if the checkpoint list is empty, the transaction obviously |
| 699 | * cannot be dropped! |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 700 | * |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 701 | * The locking here around t_state is a bit sleazy. |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 702 | * See the comment at the end of jbd2_journal_commit_transaction(). |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 703 | */ |
Jan Kara | f5a7a6b | 2008-01-28 23:58:27 -0500 | [diff] [blame] | 704 | if (transaction->t_state != T_FINISHED) { |
| 705 | JBUFFER_TRACE(jh, "belongs to running/committing transaction"); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 706 | goto out; |
| 707 | } |
| 708 | |
| 709 | /* OK, that was the last buffer for the transaction: we can now |
| 710 | safely remove this transaction from the log */ |
Theodore Ts'o | bf69932 | 2009-09-30 00:32:06 -0400 | [diff] [blame] | 711 | stats = &transaction->t_chp_stats; |
| 712 | if (stats->cs_chp_time) |
| 713 | stats->cs_chp_time = jbd2_time_diff(stats->cs_chp_time, |
| 714 | jiffies); |
| 715 | trace_jbd2_checkpoint_stats(journal->j_fs_dev->bd_dev, |
| 716 | transaction->t_tid, stats); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 717 | |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 718 | __jbd2_journal_drop_transaction(journal, transaction); |
Aneesh Kumar K.V | fb68407 | 2008-11-06 17:50:21 -0500 | [diff] [blame] | 719 | kfree(transaction); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 720 | |
| 721 | /* Just in case anybody was waiting for more transactions to be |
| 722 | checkpointed... */ |
| 723 | wake_up(&journal->j_wait_logspace); |
| 724 | ret = 1; |
| 725 | out: |
| 726 | JBUFFER_TRACE(jh, "exit"); |
| 727 | return ret; |
| 728 | } |
| 729 | |
| 730 | /* |
| 731 | * journal_insert_checkpoint: put a committed buffer onto a checkpoint |
| 732 | * list so that we know when it is safe to clean the transaction out of |
| 733 | * the log. |
| 734 | * |
| 735 | * Called with the journal locked. |
| 736 | * Called with j_list_lock held. |
| 737 | */ |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 738 | void __jbd2_journal_insert_checkpoint(struct journal_head *jh, |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 739 | transaction_t *transaction) |
| 740 | { |
| 741 | JBUFFER_TRACE(jh, "entry"); |
| 742 | J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh))); |
| 743 | J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); |
| 744 | |
| 745 | jh->b_cp_transaction = transaction; |
| 746 | |
| 747 | if (!transaction->t_checkpoint_list) { |
| 748 | jh->b_cpnext = jh->b_cpprev = jh; |
| 749 | } else { |
| 750 | jh->b_cpnext = transaction->t_checkpoint_list; |
| 751 | jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev; |
| 752 | jh->b_cpprev->b_cpnext = jh; |
| 753 | jh->b_cpnext->b_cpprev = jh; |
| 754 | } |
| 755 | transaction->t_checkpoint_list = jh; |
| 756 | } |
| 757 | |
| 758 | /* |
| 759 | * We've finished with this transaction structure: adios... |
| 760 | * |
| 761 | * The transaction must have no links except for the checkpoint by this |
| 762 | * point. |
| 763 | * |
| 764 | * Called with the journal locked. |
| 765 | * Called with j_list_lock held. |
| 766 | */ |
| 767 | |
Mingming Cao | f7f4bccb | 2006-10-11 01:20:59 -0700 | [diff] [blame] | 768 | void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction) |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 769 | { |
| 770 | assert_spin_locked(&journal->j_list_lock); |
| 771 | if (transaction->t_cpnext) { |
| 772 | transaction->t_cpnext->t_cpprev = transaction->t_cpprev; |
| 773 | transaction->t_cpprev->t_cpnext = transaction->t_cpnext; |
| 774 | if (journal->j_checkpoint_transactions == transaction) |
| 775 | journal->j_checkpoint_transactions = |
| 776 | transaction->t_cpnext; |
| 777 | if (journal->j_checkpoint_transactions == transaction) |
| 778 | journal->j_checkpoint_transactions = NULL; |
| 779 | } |
| 780 | |
| 781 | J_ASSERT(transaction->t_state == T_FINISHED); |
| 782 | J_ASSERT(transaction->t_buffers == NULL); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 783 | J_ASSERT(transaction->t_forget == NULL); |
| 784 | J_ASSERT(transaction->t_iobuf_list == NULL); |
| 785 | J_ASSERT(transaction->t_shadow_list == NULL); |
| 786 | J_ASSERT(transaction->t_log_list == NULL); |
| 787 | J_ASSERT(transaction->t_checkpoint_list == NULL); |
| 788 | J_ASSERT(transaction->t_checkpoint_io_list == NULL); |
Theodore Ts'o | a51dca9 | 2010-08-02 08:43:25 -0400 | [diff] [blame] | 789 | J_ASSERT(atomic_read(&transaction->t_updates) == 0); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 790 | J_ASSERT(journal->j_committing_transaction != transaction); |
| 791 | J_ASSERT(journal->j_running_transaction != transaction); |
| 792 | |
| 793 | jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid); |
Dave Kleikamp | 470decc | 2006-10-11 01:20:57 -0700 | [diff] [blame] | 794 | } |