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SubjectRe: [PATCH] ubifs: Fix synced_i_size calculation for xattr inodes
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Am Mittwoch, 14. Februar 2018, 12:02:48 CET schrieb Richard Weinberger:
> In ubifs_jnl_update() we sync parent and child inodes to the flash,
> in case of xattrs, the parent inode (AKA host inode) has a non-zero
> data_len. Therefore we need to adjust synced_i_size too.
>
> This issue was reported by ubifs self tests unter a xattr related work
> load.
> UBIFS error (ubi0:0 pid 1896): dbg_check_synced_i_size: ui_size is 4,
> synced_i_size is 0, but inode is clean UBIFS error (ubi0:0 pid 1896):
> dbg_check_synced_i_size: i_ino 65, i_mode 0x81a4, i_size 4
>
> Cc: <stable@vger.kernel.org>
> Fixes: 1e51764a3c2a ("UBIFS: add new flash file system")
> Signed-off-by: Richard Weinberger <richard@nod.at>
> ---
> fs/ubifs/journal.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
> index 04c4ec6483e5..e3e1e093db81 100644
> --- a/fs/ubifs/journal.c
> +++ b/fs/ubifs/journal.c
> @@ -664,6 +664,8 @@ int ubifs_jnl_update(struct ubifs_info *c, const struct
> inode *dir, finish_reservation(c);
> spin_lock(&ui->ui_lock);
> ui->synced_i_size = ui->ui_size;
> + if (xent)
> + host_ui->synced_i_size = host_ui->ui_size;
> spin_unlock(&ui->ui_lock);

Reviewing my own patch on LKML helps a lot.
We need to take host_ui->ui_lock too...

Thanks,
//richard

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