From fa8fb25abab9f2579e21ae86fdbc685b329f848d Mon Sep 17 00:00:00 2001 From: Brian Foster Date: Mon, 13 Apr 2015 09:33:46 +1000 Subject: [PATCH] repair: only check secondary sb->sb_pquotino for v5 superblocks xfs_repair scans for garbage data beyond the last valid superblock field for the particular sb version in secondary_sb_wack(). If any non-zero data is detected, the entire range is reset to zero. Subsequently, various valid superblock fields are checked for valid/expected data. The sb_pquotino field is checked unconditionally as part of this sequence even though it is a v5 only field. As a result, repair complains about a non-null project quota field if any garbage data exists for a v4 secondary sb. This is reproduced by xfs/070 against a v4 superblock and is also easily reproduced manually as follows: $ mkfs.xfs -f -m crc=0 $ xfs_db -x -c "sb 3" -c "write lsn 1" $ xfs_repair ... zeroing unused portion of secondary superblock (AG #3) non-null project quota inode field in superblock 3 ... This occurs because the garbage data detection mechanism has reset sb->sb_pquotino to 0 while the validity check expects a value of NULLFSINO. Update secondary_sb_wack() to only check sb->sb_pquotino for validity on supers where it is a valid field. If it is anything other than 0 on pre-v5 superblocks, it is explicitly reset to 0 by the garbage data checks earlier in the function. Reported-by: Xing Gu Signed-off-by: Brian Foster Reviewed-by: Dave Chinner Signed-off-by: Dave Chinner --- repair/agheader.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/repair/agheader.c b/repair/agheader.c index 416dbd833..5dbf99229 100644 --- a/repair/agheader.c +++ b/repair/agheader.c @@ -377,7 +377,13 @@ secondary_sb_wack( rval |= XR_AG_SB_SEC; } - if (sb->sb_inprogress == 1 && sb->sb_pquotino != NULLFSINO) { + /* + * Note that sb_pquotino is not considered a valid sb field for pre-v5 + * superblocks. If it is anything other than 0 it is considered garbage + * data beyond the valid sb and explicitly zeroed above. + */ + if (xfs_sb_version_has_pquotino(&mp->m_sb) && + sb->sb_inprogress == 1 && sb->sb_pquotino != NULLFSINO) { if (!no_modify) { sb->sb_pquotino = 0; dsb->sb_pquotino = 0; -- 2.47.2