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Commit 156bddd8 authored by Jan Kara's avatar Jan Kara
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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: default avatarKristian Nielsen <knielsen@knielsen-hq.org>
Signed-off-by: default avatarJan Kara <jack@suse.cz>
parent c182ae42

fs/ext3/inode.c

+14 −3
Original line number Diff line number Diff line
@@ -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);