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ext3: 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>
This commit is contained in:
Jan Kara 2012-09-03 16:50:42 +02:00
parent c182ae42cc
commit 156bddd8e5
1 changed files with 14 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/ext3/inode.c
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@ -3072,6 +3072,8 @@ static int ext3_do_update_inode(handle_t *handle,
struct ext3_inode_info *ei = EXT3_I(inode);
struct buffer_head *bh = iloc->bh;
int err = 0, rc, block;
int need_datasync = 0;
__le32 disksize;
uid_t i_uid;
gid_t i_gid;
@ -3113,7 +3115,11 @@ static int ext3_do_update_inode(handle_t *handle,
raw_inode->i_gid_high = 0;
}
raw_inode->i_links_count = cpu_to_le16(inode->i_nlink);
raw_inode->i_size = cpu_to_le32(ei->i_disksize);
disksize = cpu_to_le32(ei->i_disksize);
if (disksize != raw_inode->i_size) {
need_datasync = 1;
raw_inode->i_size = disksize;
}
raw_inode->i_atime = cpu_to_le32(inode->i_atime.tv_sec);
raw_inode->i_ctime = cpu_to_le32(inode->i_ctime.tv_sec);
raw_inode->i_mtime = cpu_to_le32(inode->i_mtime.tv_sec);
@ -3129,8 +3135,11 @@ static int ext3_do_update_inode(handle_t *handle,
if (!S_ISREG(inode->i_mode)) {
raw_inode->i_dir_acl = cpu_to_le32(ei->i_dir_acl);
} else {
raw_inode->i_size_high =
cpu_to_le32(ei->i_disksize >> 32);
disksize = cpu_to_le32(ei->i_disksize >> 32);
if (disksize != raw_inode->i_size_high) {
raw_inode->i_size_high = disksize;
need_datasync = 1;
}
if (ei->i_disksize > 0x7fffffffULL) {
struct super_block *sb = inode->i_sb;
if (!EXT3_HAS_RO_COMPAT_FEATURE(sb,
@ -3183,6 +3192,8 @@ static int ext3_do_update_inode(handle_t *handle,
ext3_clear_inode_state(inode, EXT3_STATE_NEW);
atomic_set(&ei->i_sync_tid, handle->h_transaction->t_tid);
if (need_datasync)
atomic_set(&ei->i_datasync_tid, handle->h_transaction->t_tid);
out_brelse:
brelse (bh);
ext3_std_error(inode->i_sb, err);