[PATCH v21 11/13] xfs: Add delattr mount option

[Allison Henderson <allison.henderson@xxxxxxxxxx>]

This patch adds a mount option to enable delayed attributes. Eventually
this can be removed when delayed attrs becomes permanent.

Signed-off-by: Allison Henderson <allison.henderson@xxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_attr.h | 2 +-
 fs/xfs/xfs_mount.h       | 1 +
 fs/xfs/xfs_super.c       | 6 +++++-
 fs/xfs/xfs_xattr.c       | 2 ++
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h
index 859dbef..5141958 100644
--- a/fs/xfs/libxfs/xfs_attr.h
+++ b/fs/xfs/libxfs/xfs_attr.h
@@ -30,7 +30,7 @@ struct xfs_attr_list_context;
 
 static inline bool xfs_hasdelattr(struct xfs_mount *mp)
 {
-	return false;
+	return mp->m_flags & XFS_MOUNT_DELATTR;
 }
 
 /*
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 66a47f5..2945868 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -257,6 +257,7 @@ typedef struct xfs_mount {
 #define XFS_MOUNT_NOATTR2	(1ULL << 25)	/* disable use of attr2 format */
 #define XFS_MOUNT_DAX_ALWAYS	(1ULL << 26)
 #define XFS_MOUNT_DAX_NEVER	(1ULL << 27)
+#define XFS_MOUNT_DELATTR	(1ULL << 28)	/* enable delayed attributes */
 
 /*
  * Max and min values for mount-option defined I/O
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index c30b077..1a7edae 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -94,7 +94,7 @@ enum {
 	Opt_filestreams, Opt_quota, Opt_noquota, Opt_usrquota, Opt_grpquota,
 	Opt_prjquota, Opt_uquota, Opt_gquota, Opt_pquota,
 	Opt_uqnoenforce, Opt_gqnoenforce, Opt_pqnoenforce, Opt_qnoenforce,
-	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum,
+	Opt_discard, Opt_nodiscard, Opt_dax, Opt_dax_enum, Opt_delattr
 };
 
 static const struct fs_parameter_spec xfs_fs_parameters[] = {
@@ -139,6 +139,7 @@ static const struct fs_parameter_spec xfs_fs_parameters[] = {
 	fsparam_flag("nodiscard",	Opt_nodiscard),
 	fsparam_flag("dax",		Opt_dax),
 	fsparam_enum("dax",		Opt_dax_enum, dax_param_enums),
+	fsparam_flag("delattr",		Opt_delattr),
 	{}
 };
 
@@ -1277,6 +1278,9 @@ xfs_fs_parse_param(
 		xfs_mount_set_dax_mode(parsing_mp, result.uint_32);
 		return 0;
 #endif
+	case Opt_delattr:
+		parsing_mp->m_flags |= XFS_MOUNT_DELATTR;
+		return 0;
 	/* Following mount options will be removed in September 2025 */
 	case Opt_ikeep:
 		xfs_fs_warn_deprecated(fc, param, XFS_MOUNT_IKEEP, true);
diff --git a/fs/xfs/xfs_xattr.c b/fs/xfs/xfs_xattr.c
index 66b334f..7335423 100644
--- a/fs/xfs/xfs_xattr.c
+++ b/fs/xfs/xfs_xattr.c
@@ -8,6 +8,8 @@
 #include "xfs_shared.h"
 #include "xfs_format.h"
 #include "xfs_log_format.h"
+#include "xfs_trans_resv.h"
+#include "xfs_mount.h"
 #include "xfs_da_format.h"
 #include "xfs_trans_resv.h"
 #include "xfs_mount.h"
-- 
2.7.4