xfs: check minimum block size for CRC filesystems

commit bec9d48d7a303a5bb95c05961ff07ec7eeb59058 upstream.

Check the minimum block size on v5 filesystems.

[dchinner: cleaned up XFS_MIN_CRC_BLOCKSIZE check]

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2 files changed, 9 insertions, 0 deletions

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 7a392402f2f8..2580262e4ea0 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -262,6 +262,12 @@ xfs_mount_validate_sb(
                 return -EFSCORRUPTED;
         }
 
+        if (xfs_sb_version_hascrc(&mp->m_sb) &&
+            sbp->sb_blocksize < XFS_MIN_CRC_BLOCKSIZE) {
+                xfs_notice(mp, "v5 SB sanity check failed");
+                return -EFSCORRUPTED;
+        }
+
         /*
          * Until this is fixed only page-sized or smaller data blocks work.
          */
diff --git a/fs/xfs/libxfs/xfs_types.h b/fs/xfs/libxfs/xfs_types.h
index 8d74870468c2..cf044c0f4d41 100644
--- a/fs/xfs/libxfs/xfs_types.h
+++ b/fs/xfs/libxfs/xfs_types.h
@@ -75,11 +75,14 @@ typedef __int64_t	xfs_sfiloff_t;	/* signed block number in a file */
  * Minimum and maximum blocksize and sectorsize.
  * The blocksize upper limit is pretty much arbitrary.
  * The sectorsize upper limit is due to sizeof(sb_sectsize).
+ * CRC enable filesystems use 512 byte inodes, meaning 512 byte block sizes
+ * cannot be used.
  */
 #define XFS_MIN_BLOCKSIZE_LOG   9       /* i.e. 512 bytes */
 #define XFS_MAX_BLOCKSIZE_LOG   16      /* i.e. 65536 bytes */
 #define XFS_MIN_BLOCKSIZE       (1 << XFS_MIN_BLOCKSIZE_LOG)
 #define XFS_MAX_BLOCKSIZE       (1 << XFS_MAX_BLOCKSIZE_LOG)
+#define XFS_MIN_CRC_BLOCKSIZE   (1 << (XFS_MIN_BLOCKSIZE_LOG + 1))
 #define XFS_MIN_SECTORSIZE_LOG  9       /* i.e. 512 bytes */
 #define XFS_MAX_SECTORSIZE_LOG  15      /* i.e. 32768 bytes */
 #define XFS_MIN_SECTORSIZE      (1 << XFS_MIN_SECTORSIZE_LOG)