diff options
Diffstat (limited to 'fs/jbd2/journal.c')
| -rw-r--r-- | fs/jbd2/journal.c | 245 |
1 files changed, 239 insertions, 6 deletions
diff --git a/fs/jbd2/journal.c b/fs/jbd2/journal.c index 17fdc482f554..0c7c42bd530f 100644 --- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -91,6 +91,8 @@ EXPORT_SYMBOL(jbd2_journal_try_to_free_buffers); EXPORT_SYMBOL(jbd2_journal_force_commit); EXPORT_SYMBOL(jbd2_journal_inode_ranged_write); EXPORT_SYMBOL(jbd2_journal_inode_ranged_wait); +EXPORT_SYMBOL(jbd2_journal_submit_inode_data_buffers); +EXPORT_SYMBOL(jbd2_journal_finish_inode_data_buffers); EXPORT_SYMBOL(jbd2_journal_init_jbd_inode); EXPORT_SYMBOL(jbd2_journal_release_jbd_inode); EXPORT_SYMBOL(jbd2_journal_begin_ordered_truncate); @@ -157,7 +159,9 @@ static void commit_timeout(struct timer_list *t) * * 1) COMMIT: Every so often we need to commit the current state of the * filesystem to disk. The journal thread is responsible for writing - * all of the metadata buffers to disk. + * all of the metadata buffers to disk. If a fast commit is ongoing + * journal thread waits until it's done and then continues from + * there on. * * 2) CHECKPOINT: We cannot reuse a used section of the log file until all * of the data in that part of the log has been rewritten elsewhere on @@ -714,6 +718,75 @@ int jbd2_log_wait_commit(journal_t *journal, tid_t tid) return err; } +/* + * Start a fast commit. If there's an ongoing fast or full commit wait for + * it to complete. Returns 0 if a new fast commit was started. Returns -EALREADY + * if a fast commit is not needed, either because there's an already a commit + * going on or this tid has already been committed. Returns -EINVAL if no jbd2 + * commit has yet been performed. + */ +int jbd2_fc_begin_commit(journal_t *journal, tid_t tid) +{ + /* + * Fast commits only allowed if at least one full commit has + * been processed. + */ + if (!journal->j_stats.ts_tid) + return -EINVAL; + + if (tid <= journal->j_commit_sequence) + return -EALREADY; + + write_lock(&journal->j_state_lock); + if (journal->j_flags & JBD2_FULL_COMMIT_ONGOING || + (journal->j_flags & JBD2_FAST_COMMIT_ONGOING)) { + DEFINE_WAIT(wait); + + prepare_to_wait(&journal->j_fc_wait, &wait, + TASK_UNINTERRUPTIBLE); + write_unlock(&journal->j_state_lock); + schedule(); + finish_wait(&journal->j_fc_wait, &wait); + return -EALREADY; + } + journal->j_flags |= JBD2_FAST_COMMIT_ONGOING; + write_unlock(&journal->j_state_lock); + + return 0; +} +EXPORT_SYMBOL(jbd2_fc_begin_commit); + +/* + * Stop a fast commit. If fallback is set, this function starts commit of + * TID tid before any other fast commit can start. + */ +static int __jbd2_fc_end_commit(journal_t *journal, tid_t tid, bool fallback) +{ + if (journal->j_fc_cleanup_callback) + journal->j_fc_cleanup_callback(journal, 0); + write_lock(&journal->j_state_lock); + journal->j_flags &= ~JBD2_FAST_COMMIT_ONGOING; + if (fallback) + journal->j_flags |= JBD2_FULL_COMMIT_ONGOING; + write_unlock(&journal->j_state_lock); + wake_up(&journal->j_fc_wait); + if (fallback) + return jbd2_complete_transaction(journal, tid); + return 0; +} + +int jbd2_fc_end_commit(journal_t *journal) +{ + return __jbd2_fc_end_commit(journal, 0, 0); +} +EXPORT_SYMBOL(jbd2_fc_end_commit); + +int jbd2_fc_end_commit_fallback(journal_t *journal, tid_t tid) +{ + return __jbd2_fc_end_commit(journal, tid, 1); +} +EXPORT_SYMBOL(jbd2_fc_end_commit_fallback); + /* Return 1 when transaction with given tid has already committed. */ int jbd2_transaction_committed(journal_t *journal, tid_t tid) { @@ -782,6 +855,110 @@ int jbd2_journal_next_log_block(journal_t *journal, unsigned long long *retp) return jbd2_journal_bmap(journal, blocknr, retp); } +/* Map one fast commit buffer for use by the file system */ +int jbd2_fc_get_buf(journal_t *journal, struct buffer_head **bh_out) +{ + unsigned long long pblock; + unsigned long blocknr; + int ret = 0; + struct buffer_head *bh; + int fc_off; + + *bh_out = NULL; + write_lock(&journal->j_state_lock); + + if (journal->j_fc_off + journal->j_fc_first < journal->j_fc_last) { + fc_off = journal->j_fc_off; + blocknr = journal->j_fc_first + fc_off; + journal->j_fc_off++; + } else { + ret = -EINVAL; + } + write_unlock(&journal->j_state_lock); + + if (ret) + return ret; + + ret = jbd2_journal_bmap(journal, blocknr, &pblock); + if (ret) + return ret; + + bh = __getblk(journal->j_dev, pblock, journal->j_blocksize); + if (!bh) + return -ENOMEM; + + lock_buffer(bh); + + clear_buffer_uptodate(bh); + set_buffer_dirty(bh); + unlock_buffer(bh); + journal->j_fc_wbuf[fc_off] = bh; + + *bh_out = bh; + + return 0; +} +EXPORT_SYMBOL(jbd2_fc_get_buf); + +/* + * Wait on fast commit buffers that were allocated by jbd2_fc_get_buf + * for completion. + */ +int jbd2_fc_wait_bufs(journal_t *journal, int num_blks) +{ + struct buffer_head *bh; + int i, j_fc_off; + + read_lock(&journal->j_state_lock); + j_fc_off = journal->j_fc_off; + read_unlock(&journal->j_state_lock); + + /* + * Wait in reverse order to minimize chances of us being woken up before + * all IOs have completed + */ + for (i = j_fc_off - 1; i >= j_fc_off - num_blks; i--) { + bh = journal->j_fc_wbuf[i]; + wait_on_buffer(bh); + put_bh(bh); + journal->j_fc_wbuf[i] = NULL; + if (unlikely(!buffer_uptodate(bh))) + return -EIO; + } + + return 0; +} +EXPORT_SYMBOL(jbd2_fc_wait_bufs); + +/* + * Wait on fast commit buffers that were allocated by jbd2_fc_get_buf + * for completion. + */ +int jbd2_fc_release_bufs(journal_t *journal) +{ + struct buffer_head *bh; + int i, j_fc_off; + + read_lock(&journal->j_state_lock); + j_fc_off = journal->j_fc_off; + read_unlock(&journal->j_state_lock); + + /* + * Wait in reverse order to minimize chances of us being woken up before + * all IOs have completed + */ + for (i = j_fc_off - 1; i >= 0; i--) { + bh = journal->j_fc_wbuf[i]; + if (!bh) + break; + put_bh(bh); + journal->j_fc_wbuf[i] = NULL; + } + + return 0; +} +EXPORT_SYMBOL(jbd2_fc_release_bufs); + /* * Conversion of logical to physical block numbers for the journal * @@ -1140,6 +1317,7 @@ static journal_t *journal_init_common(struct block_device *bdev, init_waitqueue_head(&journal->j_wait_commit); init_waitqueue_head(&journal->j_wait_updates); init_waitqueue_head(&journal->j_wait_reserved); + init_waitqueue_head(&journal->j_fc_wait); mutex_init(&journal->j_abort_mutex); mutex_init(&journal->j_barrier); mutex_init(&journal->j_checkpoint_mutex); @@ -1179,6 +1357,14 @@ static journal_t *journal_init_common(struct block_device *bdev, if (!journal->j_wbuf) goto err_cleanup; + if (journal->j_fc_wbufsize > 0) { + journal->j_fc_wbuf = kmalloc_array(journal->j_fc_wbufsize, + sizeof(struct buffer_head *), + GFP_KERNEL); + if (!journal->j_fc_wbuf) + goto err_cleanup; + } + bh = getblk_unmovable(journal->j_dev, start, journal->j_blocksize); if (!bh) { pr_err("%s: Cannot get buffer for journal superblock\n", @@ -1192,11 +1378,23 @@ static journal_t *journal_init_common(struct block_device *bdev, err_cleanup: kfree(journal->j_wbuf); + kfree(journal->j_fc_wbuf); jbd2_journal_destroy_revoke(journal); kfree(journal); return NULL; } +int jbd2_fc_init(journal_t *journal, int num_fc_blks) +{ + journal->j_fc_wbufsize = num_fc_blks; + journal->j_fc_wbuf = kmalloc_array(journal->j_fc_wbufsize, + sizeof(struct buffer_head *), GFP_KERNEL); + if (!journal->j_fc_wbuf) + return -ENOMEM; + return 0; +} +EXPORT_SYMBOL(jbd2_fc_init); + /* jbd2_journal_init_dev and jbd2_journal_init_inode: * * Create a journal structure assigned some fixed set of disk blocks to @@ -1314,11 +1512,20 @@ static int journal_reset(journal_t *journal) } journal->j_first = first; - journal->j_last = last; - journal->j_head = first; - journal->j_tail = first; - journal->j_free = last - first; + if (jbd2_has_feature_fast_commit(journal) && + journal->j_fc_wbufsize > 0) { + journal->j_fc_last = last; + journal->j_last = last - journal->j_fc_wbufsize; + journal->j_fc_first = journal->j_last + 1; + journal->j_fc_off = 0; + } else { + journal->j_last = last; + } + + journal->j_head = journal->j_first; + journal->j_tail = journal->j_first; + journal->j_free = journal->j_last - journal->j_first; journal->j_tail_sequence = journal->j_transaction_sequence; journal->j_commit_sequence = journal->j_transaction_sequence - 1; @@ -1464,6 +1671,7 @@ out: static void jbd2_mark_journal_empty(journal_t *journal, int write_op) { journal_superblock_t *sb = journal->j_superblock; + bool had_fast_commit = false; BUG_ON(!mutex_is_locked(&journal->j_checkpoint_mutex)); lock_buffer(journal->j_sb_buffer); @@ -1477,9 +1685,20 @@ static void jbd2_mark_journal_empty(journal_t *journal, int write_op) sb->s_sequence = cpu_to_be32(journal->j_tail_sequence); sb->s_start = cpu_to_be32(0); + if (jbd2_has_feature_fast_commit(journal)) { + /* + * When journal is clean, no need to commit fast commit flag and + * make file system incompatible with older kernels. + */ + jbd2_clear_feature_fast_commit(journal); + had_fast_commit = true; + } jbd2_write_superblock(journal, write_op); + if (had_fast_commit) + jbd2_set_feature_fast_commit(journal); + /* Log is no longer empty */ write_lock(&journal->j_state_lock); journal->j_flags |= JBD2_FLUSHED; @@ -1663,9 +1882,18 @@ static int load_superblock(journal_t *journal) journal->j_tail_sequence = be32_to_cpu(sb->s_sequence); journal->j_tail = be32_to_cpu(sb->s_start); journal->j_first = be32_to_cpu(sb->s_first); - journal->j_last = be32_to_cpu(sb->s_maxlen); journal->j_errno = be32_to_cpu(sb->s_errno); + if (jbd2_has_feature_fast_commit(journal) && + journal->j_fc_wbufsize > 0) { + journal->j_fc_last = be32_to_cpu(sb->s_maxlen); + journal->j_last = journal->j_fc_last - journal->j_fc_wbufsize; + journal->j_fc_first = journal->j_last + 1; + journal->j_fc_off = 0; + } else { + journal->j_last = be32_to_cpu(sb->s_maxlen); + } + return 0; } @@ -1726,6 +1954,9 @@ int jbd2_journal_load(journal_t *journal) */ journal->j_flags &= ~JBD2_ABORT; + if (journal->j_fc_wbufsize > 0) + jbd2_journal_set_features(journal, 0, 0, + JBD2_FEATURE_INCOMPAT_FAST_COMMIT); /* OK, we've finished with the dynamic journal bits: * reinitialise the dynamic contents of the superblock in memory * and reset them on disk. */ @@ -1809,6 +2040,8 @@ int jbd2_journal_destroy(journal_t *journal) jbd2_journal_destroy_revoke(journal); if (journal->j_chksum_driver) crypto_free_shash(journal->j_chksum_driver); + if (journal->j_fc_wbufsize > 0) + kfree(journal->j_fc_wbuf); kfree(journal->j_wbuf); kfree(journal); |