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@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_inode_buf.c | 16 ++++++++++++++++
fs/xfs/xfs_ioctl.c | 4 ++++
2 files changed, 20 insertions(+)
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index a3e8038..f1b9d97 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -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;
}
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 1388a127..c65d9ea 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -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.
--
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