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| author |   Jan Kara <jack@suse.cz> | 2012-09-26 21:52:20 -0400 |
|---|---|---|
| committer |   Theodore Ts'o <tytso@mit.edu> | 2012-09-26 21:52:20 -0400 |
| commit | b71fc079b5d8f42b2a52743c8d2f1d35d655b1c5 (patch) | |
| tree | f33b95f6bda4c99ac236dce9b81e4f076336fa5b /fs/ext4 | |
| parent | ext4: always set i_op in ext4_mknod() (diff) | |
| download | linux-dev-b71fc079b5d8f42b2a52743c8d2f1d35d655b1c5.tar.xz linux-dev-b71fc079b5d8f42b2a52743c8d2f1d35d655b1c5.zip | |
ext4: fix fdatasync() for files with only i_size changes
Code tracking when transaction needs to be committed on fdatasync(2) forgets
to handle a situation when only inode's i_size is changed. Thus in such
situations fdatasync(2) doesn't force transaction with new i_size to disk
and that can result in wrong i_size after a crash.
Fix the issue by updating inode's i_datasync_tid whenever its size is
updated.
CC: <stable@vger.kernel.org> # >= 2.6.32
Reported-by: Kristian Nielsen <knielsen@knielsen-hq.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/ext4')
| -rw-r--r-- | fs/ext4/inode.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 0a31197590d7..4df5e95801b4 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4054,6 +4054,7 @@ static int ext4_do_update_inode(handle_t *handle, struct ext4_inode_info *ei = EXT4_I(inode); struct buffer_head *bh = iloc->bh; int err = 0, rc, block; + int need_datasync = 0; uid_t i_uid; gid_t i_gid; @@ -4104,7 +4105,10 @@ static int ext4_do_update_inode(handle_t *handle, raw_inode->i_file_acl_high = cpu_to_le16(ei->i_file_acl >> 32); raw_inode->i_file_acl_lo = cpu_to_le32(ei->i_file_acl); - ext4_isize_set(raw_inode, ei->i_disksize); + if (ei->i_disksize != ext4_isize(raw_inode)) { + ext4_isize_set(raw_inode, ei->i_disksize); + need_datasync = 1; + } if (ei->i_disksize > 0x7fffffffULL) { struct super_block *sb = inode->i_sb; if (!EXT4_HAS_RO_COMPAT_FEATURE(sb, @@ -4157,7 +4161,7 @@ static int ext4_do_update_inode(handle_t *handle, err = rc; ext4_clear_inode_state(inode, EXT4_STATE_NEW); - ext4_update_inode_fsync_trans(handle, inode, 0); + ext4_update_inode_fsync_trans(handle, inode, need_datasync); out_brelse: brelse(bh); ext4_std_error(inode->i_sb, err); |