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authorTheodore Ts'o <tytso@mit.edu>2009-03-25 23:35:46 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-03-25 23:35:46 -0400
commit7058548cd50e5bda8db086bb2e5c1d82f746d047 (patch)
treeacd095e9f13fcb10deab00e5da5c22d35fda646d /fs/jbd2
parentafd4672dc7610b7feef5190168aa917cc2e417e4 (diff)
downloadlwn-7058548cd50e5bda8db086bb2e5c1d82f746d047.tar.gz
lwn-7058548cd50e5bda8db086bb2e5c1d82f746d047.zip
ext4: Use WRITE_SYNC for commits which are caused by fsync()
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>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/commit.c5
-rw-r--r--fs/jbd2/transaction.c2
2 files changed, 6 insertions, 1 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index 62804e57a44c..4ea72377c7a2 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -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;
diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c
index 28ce21d8598e..996ffda06bf3 100644
--- a/fs/jbd2/transaction.c
+++ b/fs/jbd2/transaction.c
@@ -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);