[PATCH 111/119] xfs: recognize the reflink feature bit
From: Darrick J. Wong <hidden>
Date: 2016-06-17 01:30:02
Also in:
linux-fsdevel
Subsystem:
filesystems (vfs and infrastructure), the rest, xfs filesystem · Maintainers:
Alexander Viro, Christian Brauner, Linus Torvalds, Carlos Maiolino
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 <redacted> --- fs/xfs/libxfs/xfs_format.h | 3 ++- fs/xfs/xfs_super.c | 7 +++++++ 2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index a35f4e5..211a8b5 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h@@ -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_ALL \ (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 static inline bool xfs_sb_has_ro_compat_feature(
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 93d159a..5fdf2e7 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c@@ -1587,6 +1587,9 @@ xfs_fs_fill_super( "DAX unsupported by block device. Turning off 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_hassparseinodes(&mp->m_sb))
@@ -1597,6 +1600,10 @@ xfs_fs_fill_super( xfs_alert(mp, "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); if (error) goto out_filestream_unmount;
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