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ntfs: restore $MFT mirror contents check

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check_mft_mirror() still computes the number of bytes to validate in each
mirrored MFT record, but the actual comparison against $MFTMirr was dropped
when the superblock code was updated.

As a result, mount misses a stale or inconsistent $MFTMirr as long as both
records pass the structural baad-record checks. Restore the comparison and
log an error when the primary $MFT record differs from its mirror copy.

Returning false lets the existing mount error handling mark the volume as
having NTFS errors and, with on_errors=remount-ro, continue read-only. The
default on_errors=continue mount policy still allows the mount to proceed.

Fixes: 6251f0b0de ("ntfs: update super block operations")
Signed-off-by: DaeMyung Kang <charsyam@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
This commit is contained in:
DaeMyung Kang 2026-05-11 02:11:14 +09:00 committed by Namjae Jeon
parent 8c16c1c001
commit 2beaa98b46
1 changed files with 7 additions and 0 deletions
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7
fs/ntfs/super.c
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@ -993,6 +993,13 @@ static bool check_mft_mirror(struct ntfs_volume *vol)
ntfs_is_baad_recordp((__le32 *)kmirr))
bytes = vol->mft_record_size;
}
/* Compare the two records. */
if (memcmp(kmft, kmirr, bytes)) {
ntfs_error(sb,
"$MFT and $MFTMirr record %i do not match. Run chkdsk.",
i);
goto mm_unmap_out;
}
kmft += vol->mft_record_size;
kmirr += vol->mft_record_size;
} while (++i < vol->mftmirr_size);