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xfs: check for invalid inode reflink flags

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We don't support sharing blocks on the realtime device.  Flag inodes
with the reflink or cowextsize flags set when the reflink feature is
disabled.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:50 -07:00
parent e153aa7990
commit c8e156ac33
2 changed files with 20 additions and 0 deletions
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16
fs/xfs/libxfs/xfs_inode_buf.c
View file

@ -375,6 +375,9 @@ xfs_dinode_verify(
struct xfs_inode *ip,
struct xfs_dinode *dip)
{
uint16_t flags;
uint64_t flags2;
if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
return false;
@ -391,6 +394,19 @@ xfs_dinode_verify(
return false;
if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
return false;
flags = be16_to_cpu(dip->di_flags);
flags2 = be64_to_cpu(dip->di_flags2);
/* don't allow reflink/cowextsize if we don't have reflink */
if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
!xfs_sb_version_hasreflink(&mp->m_sb))
return false;
/* don't let reflink and realtime mix */
if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
return false;
return true;
}

4
fs/xfs/xfs_ioctl.c
View file

@ -1034,6 +1034,10 @@ xfs_ioctl_setattr_xflags(
return -EINVAL;
}
/* Don't allow us to set realtime mode for a reflinked file. */
if ((fa->fsx_xflags & FS_XFLAG_REALTIME) && xfs_is_reflink_inode(ip))
return -EINVAL;
/*
* Can't modify an immutable/append-only file unless
* we have appropriate permission.