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xfs: accept filesystem with meta_uuid

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XFS V5 stores UUID in metadata and compares them with superblock UUID.
To allow changing of user-visible UUID it stores original value in new
superblock field (meta_uuid) and sets incompatible flag to indicate that
new field must be used to verify metadata. Our driver currently does not
check metadata UUID so simply accept such filesystem.

Reported-By: Marcos Mello <marcosfrm@outlook.com>
Reviewd by Jan Kara <jack@suse.cz>
This commit is contained in:
Andrei Borzenkov 2016-07-26 20:29:26 +03:00
parent b524fa27f5
commit 58590cb2ef
1 changed files with 6 additions and 1 deletions
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7
grub-core/fs/xfs.c
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@ -76,8 +76,13 @@ GRUB_MOD_LICENSE ("GPLv3+");
/* incompat feature flags */
#define XFS_SB_FEAT_INCOMPAT_FTYPE (1 << 0) /* filetype in dirent */
#define XFS_SB_FEAT_INCOMPAT_SPINODES (1 << 1) /* sparse inode chunks */
#define XFS_SB_FEAT_INCOMPAT_META_UUID (1 << 2) /* metadata UUID */
/* We do not currently verify metadata UUID so it is safe to read such filesystem */
#define XFS_SB_FEAT_INCOMPAT_SUPPORTED \
(XFS_SB_FEAT_INCOMPAT_FTYPE)
(XFS_SB_FEAT_INCOMPAT_FTYPE | \
XFS_SB_FEAT_INCOMPAT_META_UUID)
struct grub_xfs_sblock
{