ubifs: Fix synced_i_size calculation for xattr inodes

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>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/ubifs/journal.c b/fs/ubifs/journal.c
index 07b4956e0425..c83041891cef 100644
--- a/fs/ubifs/journal.c
+++ b/fs/ubifs/journal.c
@@ -664,6 +664,11 @@ int ubifs_jnl_update(struct ubifs_info *c, const struct inode *dir,
         spin_lock(&ui->ui_lock);
         ui->synced_i_size = ui->ui_size;
         spin_unlock(&ui->ui_lock);
+        if (xent) {
+                spin_lock(&host_ui->ui_lock);
+                host_ui->synced_i_size = host_ui->ui_size;
+                spin_unlock(&host_ui->ui_lock);
+        }
         mark_inode_clean(c, ui);
         mark_inode_clean(c, host_ui);
         return 0;