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| author | Theodore Ts'o <tytso@mit.edu> | 2009-04-03 01:34:35 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-04-03 01:34:35 -0400 |
| commit | f7ab34ea723ed304b19698efca85d6f40cecd99b (patch) | |
| tree | 28a609a654a24bc40d694fd2ec87a1f785c97c79 /fs/ext3 | |
| parent | 512a004382f2c60d5c4f855476ba965adc00250c (diff) | |
| download | lwn-f7ab34ea723ed304b19698efca85d6f40cecd99b.tar.gz lwn-f7ab34ea723ed304b19698efca85d6f40cecd99b.zip | |
ext3: Add replace-on-truncate hueristics for data=writeback mode
In data=writeback mode, start an asynchronous flush when closing a
file which had been previously truncated down to zero. This lowers
the probability of data loss in the case of applications that attempt
to replace a file using truncate.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext3')
| -rw-r--r-- | fs/ext3/file.c | 4 | ||||
| -rw-r--r-- | fs/ext3/inode.c | 3 |
2 files changed, 7 insertions, 0 deletions
diff --git a/fs/ext3/file.c b/fs/ext3/file.c index 3be1e0689c9a..4a04cbb1c231 100644 --- a/fs/ext3/file.c +++ b/fs/ext3/file.c @@ -33,6 +33,10 @@ */ static int ext3_release_file (struct inode * inode, struct file * filp) { + if (EXT3_I(inode)->i_state & EXT3_STATE_FLUSH_ON_CLOSE) { + filemap_flush(inode->i_mapping); + EXT3_I(inode)->i_state &= ~EXT3_STATE_FLUSH_ON_CLOSE; + } /* if we are the last writer on the inode, drop the block reservation */ if ((filp->f_mode & FMODE_WRITE) && (atomic_read(&inode->i_writecount) == 1)) diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c index 5fa453b49a64..0f5bca0d82fc 100644 --- a/fs/ext3/inode.c +++ b/fs/ext3/inode.c @@ -2346,6 +2346,9 @@ void ext3_truncate(struct inode *inode) if (!ext3_can_truncate(inode)) return; + if (inode->i_size == 0 && ext3_should_writeback_data(inode)) + ei->i_state |= EXT3_STATE_FLUSH_ON_CLOSE; + /* * We have to lock the EOF page here, because lock_page() nests * outside journal_start(). |