| /* |
| * linux/fs/jbd2/checkpoint.c |
| * |
| * Written by Stephen C. Tweedie <sct@redhat.com>, 1999 |
| * |
| * Copyright 1999 Red Hat Software --- All Rights Reserved |
| * |
| * This file is part of the Linux kernel and is made available under |
| * the terms of the GNU General Public License, version 2, or at your |
| * option, any later version, incorporated herein by reference. |
| * |
| * Checkpoint routines for the generic filesystem journaling code. |
| * Part of the ext2fs journaling system. |
| * |
| * Checkpointing is the process of ensuring that a section of the log is |
| * committed fully to disk, so that that portion of the log can be |
| * reused. |
| */ |
| |
| #include <linux/time.h> |
| #include <linux/fs.h> |
| #include <linux/jbd2.h> |
| #include <linux/marker.h> |
| #include <linux/errno.h> |
| #include <linux/slab.h> |
| |
| /* |
| * Unlink a buffer from a transaction checkpoint list. |
| * |
| * Called with j_list_lock held. |
| */ |
| static inline void __buffer_unlink_first(struct journal_head *jh) |
| { |
| transaction_t *transaction = jh->b_cp_transaction; |
| |
| jh->b_cpnext->b_cpprev = jh->b_cpprev; |
| jh->b_cpprev->b_cpnext = jh->b_cpnext; |
| if (transaction->t_checkpoint_list == jh) { |
| transaction->t_checkpoint_list = jh->b_cpnext; |
| if (transaction->t_checkpoint_list == jh) |
| transaction->t_checkpoint_list = NULL; |
| } |
| } |
| |
| /* |
| * Unlink a buffer from a transaction checkpoint(io) list. |
| * |
| * Called with j_list_lock held. |
| */ |
| static inline void __buffer_unlink(struct journal_head *jh) |
| { |
| transaction_t *transaction = jh->b_cp_transaction; |
| |
| __buffer_unlink_first(jh); |
| if (transaction->t_checkpoint_io_list == jh) { |
| transaction->t_checkpoint_io_list = jh->b_cpnext; |
| if (transaction->t_checkpoint_io_list == jh) |
| transaction->t_checkpoint_io_list = NULL; |
| } |
| } |
| |
| /* |
| * Move a buffer from the checkpoint list to the checkpoint io list |
| * |
| * Called with j_list_lock held |
| */ |
| static inline void __buffer_relink_io(struct journal_head *jh) |
| { |
| transaction_t *transaction = jh->b_cp_transaction; |
| |
| __buffer_unlink_first(jh); |
| |
| if (!transaction->t_checkpoint_io_list) { |
| jh->b_cpnext = jh->b_cpprev = jh; |
| } else { |
| jh->b_cpnext = transaction->t_checkpoint_io_list; |
| jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev; |
| jh->b_cpprev->b_cpnext = jh; |
| jh->b_cpnext->b_cpprev = jh; |
| } |
| transaction->t_checkpoint_io_list = jh; |
| } |
| |
| /* |
| * Try to release a checkpointed buffer from its transaction. |
| * Returns 1 if we released it and 2 if we also released the |
| * whole transaction. |
| * |
| * Requires j_list_lock |
| * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it |
| */ |
| static int __try_to_free_cp_buf(struct journal_head *jh) |
| { |
| int ret = 0; |
| struct buffer_head *bh = jh2bh(jh); |
| |
| if (jh->b_jlist == BJ_None && !buffer_locked(bh) && |
| !buffer_dirty(bh) && !buffer_write_io_error(bh)) { |
| JBUFFER_TRACE(jh, "remove from checkpoint list"); |
| ret = __jbd2_journal_remove_checkpoint(jh) + 1; |
| jbd_unlock_bh_state(bh); |
| jbd2_journal_remove_journal_head(bh); |
| BUFFER_TRACE(bh, "release"); |
| __brelse(bh); |
| } else { |
| jbd_unlock_bh_state(bh); |
| } |
| return ret; |
| } |
| |
| /* |
| * __jbd2_log_wait_for_space: wait until there is space in the journal. |
| * |
| * Called under j-state_lock *only*. It will be unlocked if we have to wait |
| * for a checkpoint to free up some space in the log. |
| */ |
| void __jbd2_log_wait_for_space(journal_t *journal) |
| { |
| int nblocks; |
| assert_spin_locked(&journal->j_state_lock); |
| |
| nblocks = jbd_space_needed(journal); |
| while (__jbd2_log_space_left(journal) < nblocks) { |
| if (journal->j_flags & JBD2_ABORT) |
| return; |
| spin_unlock(&journal->j_state_lock); |
| mutex_lock(&journal->j_checkpoint_mutex); |
| |
| /* |
| * Test again, another process may have checkpointed while we |
| * were waiting for the checkpoint lock. If there are no |
| * outstanding transactions there is nothing to checkpoint and |
| * we can't make progress. Abort the journal in this case. |
| */ |
| spin_lock(&journal->j_state_lock); |
| spin_lock(&journal->j_list_lock); |
| nblocks = jbd_space_needed(journal); |
| if (__jbd2_log_space_left(journal) < nblocks) { |
| int chkpt = journal->j_checkpoint_transactions != NULL; |
| |
| spin_unlock(&journal->j_list_lock); |
| spin_unlock(&journal->j_state_lock); |
| if (chkpt) { |
| jbd2_log_do_checkpoint(journal); |
| } else { |
| printk(KERN_ERR "%s: no transactions\n", |
| __func__); |
| jbd2_journal_abort(journal, 0); |
| } |
| |
| spin_lock(&journal->j_state_lock); |
| } else { |
| spin_unlock(&journal->j_list_lock); |
| } |
| mutex_unlock(&journal->j_checkpoint_mutex); |
| } |
| } |
| |
| /* |
| * We were unable to perform jbd_trylock_bh_state() inside j_list_lock. |
| * The caller must restart a list walk. Wait for someone else to run |
| * jbd_unlock_bh_state(). |
| */ |
| static void jbd_sync_bh(journal_t *journal, struct buffer_head *bh) |
| __releases(journal->j_list_lock) |
| { |
| get_bh(bh); |
| spin_unlock(&journal->j_list_lock); |
| jbd_lock_bh_state(bh); |
| jbd_unlock_bh_state(bh); |
| put_bh(bh); |
| } |
| |
| /* |
| * Clean up transaction's list of buffers submitted for io. |
| * We wait for any pending IO to complete and remove any clean |
| * buffers. Note that we take the buffers in the opposite ordering |
| * from the one in which they were submitted for IO. |
| * |
| * Return 0 on success, and return <0 if some buffers have failed |
| * to be written out. |
| * |
| * Called with j_list_lock held. |
| */ |
| static int __wait_cp_io(journal_t *journal, transaction_t *transaction) |
| { |
| struct journal_head *jh; |
| struct buffer_head *bh; |
| tid_t this_tid; |
| int released = 0; |
| int ret = 0; |
| |
| this_tid = transaction->t_tid; |
| restart: |
| /* Did somebody clean up the transaction in the meanwhile? */ |
| if (journal->j_checkpoint_transactions != transaction || |
| transaction->t_tid != this_tid) |
| return ret; |
| while (!released && transaction->t_checkpoint_io_list) { |
| jh = transaction->t_checkpoint_io_list; |
| bh = jh2bh(jh); |
| if (!jbd_trylock_bh_state(bh)) { |
| jbd_sync_bh(journal, bh); |
| spin_lock(&journal->j_list_lock); |
| goto restart; |
| } |
| if (buffer_locked(bh)) { |
| atomic_inc(&bh->b_count); |
| spin_unlock(&journal->j_list_lock); |
| jbd_unlock_bh_state(bh); |
| wait_on_buffer(bh); |
| /* the journal_head may have gone by now */ |
| BUFFER_TRACE(bh, "brelse"); |
| __brelse(bh); |
| spin_lock(&journal->j_list_lock); |
| goto restart; |
| } |
| if (unlikely(buffer_write_io_error(bh))) |
| ret = -EIO; |
| |
| /* |
| * Now in whatever state the buffer currently is, we know that |
| * it has been written out and so we can drop it from the list |
| */ |
| released = __jbd2_journal_remove_checkpoint(jh); |
| jbd_unlock_bh_state(bh); |
| jbd2_journal_remove_journal_head(bh); |
| __brelse(bh); |
| } |
| |
| return ret; |
| } |
| |
| #define NR_BATCH 64 |
| |
| static void |
| __flush_batch(journal_t *journal, struct buffer_head **bhs, int *batch_count) |
| { |
| int i; |
| |
| ll_rw_block(SWRITE, *batch_count, bhs); |
| for (i = 0; i < *batch_count; i++) { |
| struct buffer_head *bh = bhs[i]; |
| clear_buffer_jwrite(bh); |
| BUFFER_TRACE(bh, "brelse"); |
| __brelse(bh); |
| } |
| *batch_count = 0; |
| } |
| |
| /* |
| * Try to flush one buffer from the checkpoint list to disk. |
| * |
| * Return 1 if something happened which requires us to abort the current |
| * scan of the checkpoint list. Return <0 if the buffer has failed to |
| * be written out. |
| * |
| * Called with j_list_lock held and drops it if 1 is returned |
| * Called under jbd_lock_bh_state(jh2bh(jh)), and drops it |
| */ |
| static int __process_buffer(journal_t *journal, struct journal_head *jh, |
| struct buffer_head **bhs, int *batch_count, |
| transaction_t *transaction) |
| { |
| struct buffer_head *bh = jh2bh(jh); |
| int ret = 0; |
| |
| if (buffer_locked(bh)) { |
| atomic_inc(&bh->b_count); |
| spin_unlock(&journal->j_list_lock); |
| jbd_unlock_bh_state(bh); |
| wait_on_buffer(bh); |
| /* the journal_head may have gone by now */ |
| BUFFER_TRACE(bh, "brelse"); |
| __brelse(bh); |
| ret = 1; |
| } else if (jh->b_transaction != NULL) { |
| transaction_t *t = jh->b_transaction; |
| tid_t tid = t->t_tid; |
| |
| transaction->t_chp_stats.cs_forced_to_close++; |
| spin_unlock(&journal->j_list_lock); |
| jbd_unlock_bh_state(bh); |
| jbd2_log_start_commit(journal, tid); |
| jbd2_log_wait_commit(journal, tid); |
| ret = 1; |
| } else if (!buffer_dirty(bh)) { |
| ret = 1; |
| if (unlikely(buffer_write_io_error(bh))) |
| ret = -EIO; |
| J_ASSERT_JH(jh, !buffer_jbddirty(bh)); |
| BUFFER_TRACE(bh, "remove from checkpoint"); |
| __jbd2_journal_remove_checkpoint(jh); |
| spin_unlock(&journal->j_list_lock); |
| jbd_unlock_bh_state(bh); |
| jbd2_journal_remove_journal_head(bh); |
| __brelse(bh); |
| } else { |
| /* |
| * Important: we are about to write the buffer, and |
| * possibly block, while still holding the journal lock. |
| * We cannot afford to let the transaction logic start |
| * messing around with this buffer before we write it to |
| * disk, as that would break recoverability. |
| */ |
| BUFFER_TRACE(bh, "queue"); |
| get_bh(bh); |
| J_ASSERT_BH(bh, !buffer_jwrite(bh)); |
| set_buffer_jwrite(bh); |
| bhs[*batch_count] = bh; |
| __buffer_relink_io(jh); |
| jbd_unlock_bh_state(bh); |
| transaction->t_chp_stats.cs_written++; |
| (*batch_count)++; |
| if (*batch_count == NR_BATCH) { |
| spin_unlock(&journal->j_list_lock); |
| __flush_batch(journal, bhs, batch_count); |
| ret = 1; |
| } |
| } |
| return ret; |
| } |
| |
| /* |
| * Perform an actual checkpoint. We take the first transaction on the |
| * list of transactions to be checkpointed and send all its buffers |
| * to disk. We submit larger chunks of data at once. |
| * |
| * The journal should be locked before calling this function. |
| * Called with j_checkpoint_mutex held. |
| */ |
| int jbd2_log_do_checkpoint(journal_t *journal) |
| { |
| transaction_t *transaction; |
| tid_t this_tid; |
| int result; |
| |
| jbd_debug(1, "Start checkpoint\n"); |
| |
| /* |
| * First thing: if there are any transactions in the log which |
| * don't need checkpointing, just eliminate them from the |
| * journal straight away. |
| */ |
| result = jbd2_cleanup_journal_tail(journal); |
| trace_mark(jbd2_checkpoint, "dev %s need_checkpoint %d", |
| journal->j_devname, result); |
| jbd_debug(1, "cleanup_journal_tail returned %d\n", result); |
| if (result <= 0) |
| return result; |
| |
| /* |
| * OK, we need to start writing disk blocks. Take one transaction |
| * and write it. |
| */ |
| result = 0; |
| spin_lock(&journal->j_list_lock); |
| if (!journal->j_checkpoint_transactions) |
| goto out; |
| transaction = journal->j_checkpoint_transactions; |
| if (transaction->t_chp_stats.cs_chp_time == 0) |
| transaction->t_chp_stats.cs_chp_time = jiffies; |
| this_tid = transaction->t_tid; |
| restart: |
| /* |
| * If someone cleaned up this transaction while we slept, we're |
| * done (maybe it's a new transaction, but it fell at the same |
| * address). |
| */ |
| if (journal->j_checkpoint_transactions == transaction && |
| transaction->t_tid == this_tid) { |
| int batch_count = 0; |
| struct buffer_head *bhs[NR_BATCH]; |
| struct journal_head *jh; |
| int retry = 0, err; |
| |
| while (!retry && transaction->t_checkpoint_list) { |
| struct buffer_head *bh; |
| |
| jh = transaction->t_checkpoint_list; |
| bh = jh2bh(jh); |
| if (!jbd_trylock_bh_state(bh)) { |
| jbd_sync_bh(journal, bh); |
| retry = 1; |
| break; |
| } |
| retry = __process_buffer(journal, jh, bhs, &batch_count, |
| transaction); |
| if (retry < 0 && !result) |
| result = retry; |
| if (!retry && (need_resched() || |
| spin_needbreak(&journal->j_list_lock))) { |
| spin_unlock(&journal->j_list_lock); |
| retry = 1; |
| break; |
| } |
| } |
| |
| if (batch_count) { |
| if (!retry) { |
| spin_unlock(&journal->j_list_lock); |
| retry = 1; |
| } |
| __flush_batch(journal, bhs, &batch_count); |
| } |
| |
| if (retry) { |
| spin_lock(&journal->j_list_lock); |
| goto restart; |
| } |
| /* |
| * Now we have cleaned up the first transaction's checkpoint |
| * list. Let's clean up the second one |
| */ |
| err = __wait_cp_io(journal, transaction); |
| if (!result) |
| result = err; |
| } |
| out: |
| spin_unlock(&journal->j_list_lock); |
| if (result < 0) |
| jbd2_journal_abort(journal, result); |
| else |
| result = jbd2_cleanup_journal_tail(journal); |
| |
| return (result < 0) ? result : 0; |
| } |
| |
| /* |
| * Check the list of checkpoint transactions for the journal to see if |
| * we have already got rid of any since the last update of the log tail |
| * in the journal superblock. If so, we can instantly roll the |
| * superblock forward to remove those transactions from the log. |
| * |
| * Return <0 on error, 0 on success, 1 if there was nothing to clean up. |
| * |
| * Called with the journal lock held. |
| * |
| * This is the only part of the journaling code which really needs to be |
| * aware of transaction aborts. Checkpointing involves writing to the |
| * main filesystem area rather than to the journal, so it can proceed |
| * even in abort state, but we must not update the super block if |
| * checkpointing may have failed. Otherwise, we would lose some metadata |
| * buffers which should be written-back to the filesystem. |
| */ |
| |
| int jbd2_cleanup_journal_tail(journal_t *journal) |
| { |
| transaction_t * transaction; |
| tid_t first_tid; |
| unsigned long blocknr, freed; |
| |
| if (is_journal_aborted(journal)) |
| return 1; |
| |
| /* OK, work out the oldest transaction remaining in the log, and |
| * the log block it starts at. |
| * |
| * If the log is now empty, we need to work out which is the |
| * next transaction ID we will write, and where it will |
| * start. */ |
| |
| spin_lock(&journal->j_state_lock); |
| spin_lock(&journal->j_list_lock); |
| transaction = journal->j_checkpoint_transactions; |
| if (transaction) { |
| first_tid = transaction->t_tid; |
| blocknr = transaction->t_log_start; |
| } else if ((transaction = journal->j_committing_transaction) != NULL) { |
| first_tid = transaction->t_tid; |
| blocknr = transaction->t_log_start; |
| } else if ((transaction = journal->j_running_transaction) != NULL) { |
| first_tid = transaction->t_tid; |
| blocknr = journal->j_head; |
| } else { |
| first_tid = journal->j_transaction_sequence; |
| blocknr = journal->j_head; |
| } |
| spin_unlock(&journal->j_list_lock); |
| J_ASSERT(blocknr != 0); |
| |
| /* If the oldest pinned transaction is at the tail of the log |
| already then there's not much we can do right now. */ |
| if (journal->j_tail_sequence == first_tid) { |
| spin_unlock(&journal->j_state_lock); |
| return 1; |
| } |
| |
| /* OK, update the superblock to recover the freed space. |
| * Physical blocks come first: have we wrapped beyond the end of |
| * the log? */ |
| freed = blocknr - journal->j_tail; |
| if (blocknr < journal->j_tail) |
| freed = freed + journal->j_last - journal->j_first; |
| |
| jbd_debug(1, |
| "Cleaning journal tail from %d to %d (offset %lu), " |
| "freeing %lu\n", |
| journal->j_tail_sequence, first_tid, blocknr, freed); |
| |
| journal->j_free += freed; |
| journal->j_tail_sequence = first_tid; |
| journal->j_tail = blocknr; |
| spin_unlock(&journal->j_state_lock); |
| if (!(journal->j_flags & JBD2_ABORT)) |
| jbd2_journal_update_superblock(journal, 1); |
| return 0; |
| } |
| |
| |
| /* Checkpoint list management */ |
| |
| /* |
| * journal_clean_one_cp_list |
| * |
| * Find all the written-back checkpoint buffers in the given list and release them. |
| * |
| * Called with the journal locked. |
| * Called with j_list_lock held. |
| * Returns number of bufers reaped (for debug) |
| */ |
| |
| static int journal_clean_one_cp_list(struct journal_head *jh, int *released) |
| { |
| struct journal_head *last_jh; |
| struct journal_head *next_jh = jh; |
| int ret, freed = 0; |
| |
| *released = 0; |
| if (!jh) |
| return 0; |
| |
| last_jh = jh->b_cpprev; |
| do { |
| jh = next_jh; |
| next_jh = jh->b_cpnext; |
| /* Use trylock because of the ranking */ |
| if (jbd_trylock_bh_state(jh2bh(jh))) { |
| ret = __try_to_free_cp_buf(jh); |
| if (ret) { |
| freed++; |
| if (ret == 2) { |
| *released = 1; |
| return freed; |
| } |
| } |
| } |
| /* |
| * This function only frees up some memory |
| * if possible so we dont have an obligation |
| * to finish processing. Bail out if preemption |
| * requested: |
| */ |
| if (need_resched()) |
| return freed; |
| } while (jh != last_jh); |
| |
| return freed; |
| } |
| |
| /* |
| * journal_clean_checkpoint_list |
| * |
| * Find all the written-back checkpoint buffers in the journal and release them. |
| * |
| * Called with the journal locked. |
| * Called with j_list_lock held. |
| * Returns number of buffers reaped (for debug) |
| */ |
| |
| int __jbd2_journal_clean_checkpoint_list(journal_t *journal) |
| { |
| transaction_t *transaction, *last_transaction, *next_transaction; |
| int ret = 0; |
| int released; |
| |
| transaction = journal->j_checkpoint_transactions; |
| if (!transaction) |
| goto out; |
| |
| last_transaction = transaction->t_cpprev; |
| next_transaction = transaction; |
| do { |
| transaction = next_transaction; |
| next_transaction = transaction->t_cpnext; |
| ret += journal_clean_one_cp_list(transaction-> |
| t_checkpoint_list, &released); |
| /* |
| * This function only frees up some memory if possible so we |
| * dont have an obligation to finish processing. Bail out if |
| * preemption requested: |
| */ |
| if (need_resched()) |
| goto out; |
| if (released) |
| continue; |
| /* |
| * It is essential that we are as careful as in the case of |
| * t_checkpoint_list with removing the buffer from the list as |
| * we can possibly see not yet submitted buffers on io_list |
| */ |
| ret += journal_clean_one_cp_list(transaction-> |
| t_checkpoint_io_list, &released); |
| if (need_resched()) |
| goto out; |
| } while (transaction != last_transaction); |
| out: |
| return ret; |
| } |
| |
| /* |
| * journal_remove_checkpoint: called after a buffer has been committed |
| * to disk (either by being write-back flushed to disk, or being |
| * committed to the log). |
| * |
| * We cannot safely clean a transaction out of the log until all of the |
| * buffer updates committed in that transaction have safely been stored |
| * elsewhere on disk. To achieve this, all of the buffers in a |
| * transaction need to be maintained on the transaction's checkpoint |
| * lists until they have been rewritten, at which point this function is |
| * called to remove the buffer from the existing transaction's |
| * checkpoint lists. |
| * |
| * The function returns 1 if it frees the transaction, 0 otherwise. |
| * |
| * This function is called with the journal locked. |
| * This function is called with j_list_lock held. |
| * This function is called with jbd_lock_bh_state(jh2bh(jh)) |
| */ |
| |
| int __jbd2_journal_remove_checkpoint(struct journal_head *jh) |
| { |
| transaction_t *transaction; |
| journal_t *journal; |
| int ret = 0; |
| |
| JBUFFER_TRACE(jh, "entry"); |
| |
| if ((transaction = jh->b_cp_transaction) == NULL) { |
| JBUFFER_TRACE(jh, "not on transaction"); |
| goto out; |
| } |
| journal = transaction->t_journal; |
| |
| __buffer_unlink(jh); |
| jh->b_cp_transaction = NULL; |
| |
| if (transaction->t_checkpoint_list != NULL || |
| transaction->t_checkpoint_io_list != NULL) |
| goto out; |
| JBUFFER_TRACE(jh, "transaction has no more buffers"); |
| |
| /* |
| * There is one special case to worry about: if we have just pulled the |
| * buffer off a running or committing transaction's checkpoing list, |
| * then even if the checkpoint list is empty, the transaction obviously |
| * cannot be dropped! |
| * |
| * The locking here around t_state is a bit sleazy. |
| * See the comment at the end of jbd2_journal_commit_transaction(). |
| */ |
| if (transaction->t_state != T_FINISHED) { |
| JBUFFER_TRACE(jh, "belongs to running/committing transaction"); |
| goto out; |
| } |
| |
| /* OK, that was the last buffer for the transaction: we can now |
| safely remove this transaction from the log */ |
| |
| __jbd2_journal_drop_transaction(journal, transaction); |
| |
| /* Just in case anybody was waiting for more transactions to be |
| checkpointed... */ |
| wake_up(&journal->j_wait_logspace); |
| ret = 1; |
| out: |
| JBUFFER_TRACE(jh, "exit"); |
| return ret; |
| } |
| |
| /* |
| * journal_insert_checkpoint: put a committed buffer onto a checkpoint |
| * list so that we know when it is safe to clean the transaction out of |
| * the log. |
| * |
| * Called with the journal locked. |
| * Called with j_list_lock held. |
| */ |
| void __jbd2_journal_insert_checkpoint(struct journal_head *jh, |
| transaction_t *transaction) |
| { |
| JBUFFER_TRACE(jh, "entry"); |
| J_ASSERT_JH(jh, buffer_dirty(jh2bh(jh)) || buffer_jbddirty(jh2bh(jh))); |
| J_ASSERT_JH(jh, jh->b_cp_transaction == NULL); |
| |
| jh->b_cp_transaction = transaction; |
| |
| if (!transaction->t_checkpoint_list) { |
| jh->b_cpnext = jh->b_cpprev = jh; |
| } else { |
| jh->b_cpnext = transaction->t_checkpoint_list; |
| jh->b_cpprev = transaction->t_checkpoint_list->b_cpprev; |
| jh->b_cpprev->b_cpnext = jh; |
| jh->b_cpnext->b_cpprev = jh; |
| } |
| transaction->t_checkpoint_list = jh; |
| } |
| |
| /* |
| * We've finished with this transaction structure: adios... |
| * |
| * The transaction must have no links except for the checkpoint by this |
| * point. |
| * |
| * Called with the journal locked. |
| * Called with j_list_lock held. |
| */ |
| |
| void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transaction) |
| { |
| assert_spin_locked(&journal->j_list_lock); |
| if (transaction->t_cpnext) { |
| transaction->t_cpnext->t_cpprev = transaction->t_cpprev; |
| transaction->t_cpprev->t_cpnext = transaction->t_cpnext; |
| if (journal->j_checkpoint_transactions == transaction) |
| journal->j_checkpoint_transactions = |
| transaction->t_cpnext; |
| if (journal->j_checkpoint_transactions == transaction) |
| journal->j_checkpoint_transactions = NULL; |
| } |
| |
| J_ASSERT(transaction->t_state == T_FINISHED); |
| J_ASSERT(transaction->t_buffers == NULL); |
| J_ASSERT(transaction->t_forget == NULL); |
| J_ASSERT(transaction->t_iobuf_list == NULL); |
| J_ASSERT(transaction->t_shadow_list == NULL); |
| J_ASSERT(transaction->t_log_list == NULL); |
| J_ASSERT(transaction->t_checkpoint_list == NULL); |
| J_ASSERT(transaction->t_checkpoint_io_list == NULL); |
| J_ASSERT(transaction->t_updates == 0); |
| J_ASSERT(journal->j_committing_transaction != transaction); |
| J_ASSERT(journal->j_running_transaction != transaction); |
| |
| jbd_debug(1, "Dropping transaction %d, all done\n", transaction->t_tid); |
| kfree(transaction); |
| } |