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xfs: recognize the reflink feature bit 

Add the reflink feature flag to the set of recognized feature flags.
This enables users to write to reflink filesystems.

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 09:11:52 -07:00
parent a35eb41519
commit e54b5bf9d7
2 changed files with 9 additions and 1 deletions
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3
fs/xfs/libxfs/xfs_format.h
View File

@ -459,7 +459,8 @@ xfs_sb_has_compat_feature(
#define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */ #define XFS_SB_FEAT_RO_COMPAT_REFLINK (1 << 2) /* reflinked files */
#define XFS_SB_FEAT_RO_COMPAT_ALL \ #define XFS_SB_FEAT_RO_COMPAT_ALL \
(XFS_SB_FEAT_RO_COMPAT_FINOBT | \ (XFS_SB_FEAT_RO_COMPAT_FINOBT | \
XFS_SB_FEAT_RO_COMPAT_RMAPBT) XFS_SB_FEAT_RO_COMPAT_RMAPBT | \
XFS_SB_FEAT_RO_COMPAT_REFLINK)
#define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL #define XFS_SB_FEAT_RO_COMPAT_UNKNOWN ~XFS_SB_FEAT_RO_COMPAT_ALL
static inline bool static inline bool
xfs_sb_has_ro_compat_feature( xfs_sb_has_ro_compat_feature(

7
fs/xfs/xfs_super.c
View File

@ -1614,6 +1614,9 @@ xfs_fs_fill_super(
"DAX unsupported by block device. Turning off DAX."); "DAX unsupported by block device. Turning off DAX.");
mp->m_flags &= ~XFS_MOUNT_DAX; mp->m_flags &= ~XFS_MOUNT_DAX;
} }
if (xfs_sb_version_hasreflink(&mp->m_sb))
xfs_alert(mp,
"DAX and reflink have not been tested together!");
} }
if (xfs_sb_version_hasrmapbt(&mp->m_sb)) { if (xfs_sb_version_hasrmapbt(&mp->m_sb)) {
@ -1627,6 +1630,10 @@ xfs_fs_fill_super(
"EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!"); "EXPERIMENTAL reverse mapping btree feature enabled. Use at your own risk!");
} }
if (xfs_sb_version_hasreflink(&mp->m_sb))
xfs_alert(mp,
"EXPERIMENTAL reflink feature enabled. Use at your own risk!");
error = xfs_mountfs(mp); error = xfs_mountfs(mp);
if (error) if (error)
goto out_filestream_unmount; goto out_filestream_unmount;