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| author | Jan Kara <jack@suse.cz> | 2009-12-08 23:51:10 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2009-12-08 23:51:10 -0500 |
| commit | b436b9bef84de6893e86346d8fbf7104bc520645 (patch) | |
| tree | 50fb9ae167bcd622e9adf47646bcf3b4c7dd111d /fs/ext4/extents.c | |
| parent | 194074acacebc169ded90a4657193f5180015051 (diff) | |
| download | kernel_goldelico_gta04-b436b9bef84de6893e86346d8fbf7104bc520645.zip kernel_goldelico_gta04-b436b9bef84de6893e86346d8fbf7104bc520645.tar.gz kernel_goldelico_gta04-b436b9bef84de6893e86346d8fbf7104bc520645.tar.bz2 | |
ext4: Wait for proper transaction commit on fsync
We cannot rely on buffer dirty bits during fsync because pdflush can come
before fsync is called and clear dirty bits without forcing a transaction
commit. What we do is that we track which transaction has last changed
the inode and which transaction last changed allocation and force it to
disk on fsync.
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/extents.c')
| -rw-r--r-- | fs/ext4/extents.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 5967f18..700206e 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3058,6 +3058,8 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, if (flags == EXT4_GET_BLOCKS_DIO_CONVERT_EXT) { ret = ext4_convert_unwritten_extents_dio(handle, inode, path); + if (ret >= 0) + ext4_update_inode_fsync_trans(handle, inode, 1); goto out2; } /* buffered IO case */ @@ -3085,6 +3087,8 @@ ext4_ext_handle_uninitialized_extents(handle_t *handle, struct inode *inode, ret = ext4_ext_convert_to_initialized(handle, inode, path, iblock, max_blocks); + if (ret >= 0) + ext4_update_inode_fsync_trans(handle, inode, 1); out: if (ret <= 0) { err = ret; @@ -3323,10 +3327,16 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, allocated = ext4_ext_get_actual_len(&newex); set_buffer_new(bh_result); - /* Cache only when it is _not_ an uninitialized extent */ - if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) + /* + * Cache the extent and update transaction to commit on fdatasync only + * when it is _not_ an uninitialized extent. + */ + if ((flags & EXT4_GET_BLOCKS_UNINIT_EXT) == 0) { ext4_ext_put_in_cache(inode, iblock, allocated, newblock, EXT4_EXT_CACHE_EXTENT); + ext4_update_inode_fsync_trans(handle, inode, 1); + } else + ext4_update_inode_fsync_trans(handle, inode, 0); out: if (allocated > max_blocks) allocated = max_blocks; |