[PATCH] ubifs: mount fails after power cycle

[Ravi Minnikanti]

When kernel uses file system encryption, fscrypt on UBIFS v5,
after a hard power cycle UBIFS journal replay fails which results in mount failure.

Failure logs:
UBIFS: recovery needed
UBIFS error (pid 0): ubifs_validate_entry: bad directory entry node
UBIFS error (pid 0): replay_bud: bad node is at LEB 890:24576
UBIFS error (pid 0): ubifs_mount: Error reading superblock on volume 'ubi0:rootfs' errno=-22!

This change is ported from kernel:
commit id: 304790c038bc4af4f19774705409db27eafb09fc

Kernel commit description:
    Kernel commit description:
    ubifs: Relax checks in ubifs_validate_entry()

    With encrypted filenames we store raw binary data, doing
    string tests is no longer possible.

~

Change-Id: I487ae4d172e228e72ac31d158d668f209142bce0
Signed-off-by: rminnikanti <rminnikanti at marvell.com>
---
 fs/ubifs/replay.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/ubifs/replay.c b/fs/ubifs/replay.c
index aa7f281ef6..b6e03b76d4 100644
--- a/fs/ubifs/replay.c
+++ b/fs/ubifs/replay.c
@@ -451,7 +451,7 @@ int ubifs_validate_entry(struct ubifs_info *c,
 	if (le32_to_cpu(dent->ch.len) != nlen + UBIFS_DENT_NODE_SZ + 1 ||
 	    dent->type >= UBIFS_ITYPES_CNT ||
 	    nlen > UBIFS_MAX_NLEN || dent->name[nlen] != 0 ||
-	    strnlen(dent->name, nlen) != nlen ||
+	    (key_type == UBIFS_XENT_KEY && strnlen(dent->name, nlen) != nlen) ||
 	    le64_to_cpu(dent->inum) > MAX_INUM) {
 		ubifs_err(c, "bad %s node", key_type == UBIFS_DENT_KEY ?
 			  "directory entry" : "extended attribute entry");
-- 
2.25.1

Thanks,
Ravi