On thu, 18 Aug 2011 16:11:31 +0800, Miao Xie wrote:
> If we write some data into the data hole of the file(no preallocation for this
> hole), Btrfs will allocate some disk space, and update nbytes of the inode, but
> the other element--disk_i_size needn't be updated. At this condition, we must
> update inode metadata though disk_i_size is not changed(btrfs_ordered_update_i_size()
> return 1).
>
> # mkfs.btrfs /dev/sdb1
> # mount /dev/sdb1 /mnt
> # touch /mnt/a
> # truncate -s 856002 /mnt/a
> # dd if=/dev/zero of=/mnt/a bs=4K count=1 conv=nocreat,notrunc
> # umount /mnt
> # btrfsck /dev/sdb1
> root 5 inode 257 errors 400
> found 32768 bytes used err is 1
>
> Signed-off-by: Miao Xie <miaox@xxxxxxxxxxxxxx>
Reported-by: Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx>
Tested-by: Tsutomu Itoh <t-itoh@xxxxxxxxxxxxxx>
> ---
> fs/btrfs/inode.c | 4 ++--
> 1 files changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index 18d08f4..634dd797 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -1786,7 +1786,7 @@ static int btrfs_finish_ordered_io(struct inode *inode, u64 start, u64 end)
> &ordered_extent->list);
>
> ret = btrfs_ordered_update_i_size(inode, 0, ordered_extent);
> - if (!ret) {
> + if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered_extent->flags)) {
> ret = btrfs_update_inode(trans, root, inode);
> BUG_ON(ret);
> }
> @@ -5788,7 +5788,7 @@ again:
>
> add_pending_csums(trans, inode, ordered->file_offset, &ordered->list);
> ret = btrfs_ordered_update_i_size(inode, 0, ordered);
> - if (!ret)
> + if (!ret || !test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags))
> btrfs_update_inode(trans, root, inode);
> ret = 0;
> out_unlock:
--
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