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ext4: Use WRITE_SYNC for commits which are caused by fsync()

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If a commit is triggered by fsync(), set a flag indicating the journal
blocks associated with the transaction should be flushed out using
WRITE_SYNC.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o 2009-03-25 23:35:46 -04:00
parent afd4672dc7
commit 7058548cd5
3 changed files with 12 additions and 1 deletions
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5
fs/jbd2/commit.c
View file

@ -367,6 +367,7 @@ void jbd2_journal_commit_transaction(journal_t *journal)
int tag_bytes = journal_tag_bytes(journal);
struct buffer_head *cbh = NULL; /* For transactional checksums */
__u32 crc32_sum = ~0;
int write_op = WRITE;
/*
* First job: lock down the current transaction and wait for
@ -401,6 +402,8 @@ void jbd2_journal_commit_transaction(journal_t *journal)
spin_lock(&journal->j_state_lock);
commit_transaction->t_state = T_LOCKED;
if (commit_transaction->t_synchronous_commit)
write_op = WRITE_SYNC;
stats.u.run.rs_wait = commit_transaction->t_max_wait;
stats.u.run.rs_locked = jiffies;
stats.u.run.rs_running = jbd2_time_diff(commit_transaction->t_start,
@ -680,7 +683,7 @@ start_journal_io:
clear_buffer_dirty(bh);
set_buffer_uptodate(bh);
bh->b_end_io = journal_end_buffer_io_sync;
submit_bh(WRITE, bh);
submit_bh(write_op, bh);
}
cond_resched();
stats.u.run.rs_blocks_logged += bufs;

2
fs/jbd2/transaction.c
View file

@ -1315,6 +1315,8 @@ int jbd2_journal_stop(handle_t *handle)
}
}
if (handle->h_sync)
transaction->t_synchronous_commit = 1;
current->journal_info = NULL;
spin_lock(&journal->j_state_lock);
spin_lock(&transaction->t_handle_lock);

6
include/linux/jbd2.h
View file

@ -648,6 +648,12 @@ struct transaction_s
*/
int t_handle_count;
/*
* This transaction is being forced and some process is
* waiting for it to finish.
*/
int t_synchronous_commit:1;
/*
* For use by the filesystem to store fs-specific data
* structures associated with the transaction