Fixes for 5.19-rc3:

- Fix a bug where inode flag changes would accidentally drop nrext64.
  - Fix a race condition when toggling LARP mode.
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Merge tag 'xfs-5.19-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "There's not a whole lot this time around (I'm still on vacation) but
  here are some important fixes for new features merged in -rc1:

   - Fix a bug where inode flag changes would accidentally drop nrext64

   - Fix a race condition when toggling LARP mode"

* tag 'xfs-5.19-fixes-1' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: preserve DIFLAG2_NREXT64 when setting other inode attributes
  xfs: fix variable state usage
  xfs: fix TOCTOU race involving the new logged xattrs control knob

fs/xfs/libxfs/xfs_attr.c

@@ -997,9 +997,11 @@ xfs_attr_set(
 	/*
 	 * We have no control over the attribute names that userspace passes us
 	 * to remove, so we have to allow the name lookup prior to attribute
-	 * removal to fail as well.
+	 * removal to fail as well.  Preserve the logged flag, since we need
+	 * to pass that through to the logging code.
 	 */
-	args->op_flags = XFS_DA_OP_OKNOENT;
+	args->op_flags = XFS_DA_OP_OKNOENT |
+					(args->op_flags & XFS_DA_OP_LOGGED);
 
 	if (args->value) {
 		XFS_STATS_INC(mp, xs_attr_set);
@@ -1439,12 +1441,11 @@ static int
 xfs_attr_node_try_addname(
 	struct xfs_attr_intent		*attr)
 {
-	struct xfs_da_args		*args = attr->xattri_da_args;
 	struct xfs_da_state		*state = attr->xattri_da_state;
 	struct xfs_da_state_blk		*blk;
 	int				error;
 
-	trace_xfs_attr_node_addname(args);
+	trace_xfs_attr_node_addname(state->args);
 
 	blk = &state->path.blk[state->path.active-1];
 	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);

fs/xfs/libxfs/xfs_attr.h

@@ -28,16 +28,6 @@ struct xfs_attr_list_context;
  */
 #define	ATTR_MAX_VALUELEN	(64*1024)	/* max length of a value */
 
-static inline bool xfs_has_larp(struct xfs_mount *mp)
-{
-#ifdef DEBUG
-	/* Logged xattrs require a V5 super for log_incompat */
-	return xfs_has_crc(mp) && xfs_globals.larp;
-#else
-	return false;
-#endif
-}
-
 /*
  * Kernel-internal version of the attrlist cursor.
  */
@@ -624,7 +614,7 @@ static inline enum xfs_delattr_state
 xfs_attr_init_replace_state(struct xfs_da_args *args)
 {
 	args->op_flags |= XFS_DA_OP_ADDNAME | XFS_DA_OP_REPLACE;
-	if (xfs_has_larp(args->dp->i_mount))
+	if (args->op_flags & XFS_DA_OP_LOGGED)
 		return xfs_attr_init_remove_state(args);
 	return xfs_attr_init_add_state(args);
 }

fs/xfs/libxfs/xfs_attr_leaf.c

@@ -1530,7 +1530,7 @@ xfs_attr3_leaf_add_work(
 	if (tmp)
 		entry->flags |= XFS_ATTR_LOCAL;
 	if (args->op_flags & XFS_DA_OP_REPLACE) {
-		if (!xfs_has_larp(mp))
+		if (!(args->op_flags & XFS_DA_OP_LOGGED))
 			entry->flags |= XFS_ATTR_INCOMPLETE;
 		if ((args->blkno2 == args->blkno) &&
 		    (args->index2 <= args->index)) {

fs/xfs/libxfs/xfs_da_btree.h

@@ -92,6 +92,7 @@ typedef struct xfs_da_args {
 #define XFS_DA_OP_NOTIME	(1u << 5) /* don't update inode timestamps */
 #define XFS_DA_OP_REMOVE	(1u << 6) /* this is a remove operation */
 #define XFS_DA_OP_RECOVERY	(1u << 7) /* Log recovery operation */
+#define XFS_DA_OP_LOGGED	(1u << 8) /* Use intent items to track op */
 
 #define XFS_DA_OP_FLAGS \
 	{ XFS_DA_OP_JUSTCHECK,	"JUSTCHECK" }, \
@@ -101,7 +102,8 @@ typedef struct xfs_da_args {
 	{ XFS_DA_OP_CILOOKUP,	"CILOOKUP" }, \
 	{ XFS_DA_OP_NOTIME,	"NOTIME" }, \
 	{ XFS_DA_OP_REMOVE,	"REMOVE" }, \
-	{ XFS_DA_OP_RECOVERY,	"RECOVERY" }
+	{ XFS_DA_OP_RECOVERY,	"RECOVERY" }, \
+	{ XFS_DA_OP_LOGGED,	"LOGGED" }
 
 /*
  * Storage for holding state during Btree searches and split/join ops.

fs/xfs/xfs_attr_item.c

@@ -413,18 +413,20 @@ xfs_attr_create_intent(
 	struct xfs_mount		*mp = tp->t_mountp;
 	struct xfs_attri_log_item	*attrip;
 	struct xfs_attr_intent		*attr;
+	struct xfs_da_args		*args;
 
 	ASSERT(count == 1);
 
-	if (!xfs_sb_version_haslogxattrs(&mp->m_sb))
-		return NULL;
-
 	/*
 	 * Each attr item only performs one attribute operation at a time, so
 	 * this is a list of one
 	 */
 	attr = list_first_entry_or_null(items, struct xfs_attr_intent,
 			xattri_list);
+	args = attr->xattri_da_args;
+
+	if (!(args->op_flags & XFS_DA_OP_LOGGED))
+		return NULL;
 
 	/*
 	 * Create a buffer to store the attribute name and value.  This buffer
@@ -432,8 +434,6 @@ xfs_attr_create_intent(
 	 * and the lower level xattr log items.
 	 */
 	if (!attr->xattri_nameval) {
-		struct xfs_da_args	*args = attr->xattri_da_args;
-
 		/*
 		 * Transfer our reference to the name/value buffer to the
 		 * deferred work state structure.
@@ -617,7 +617,10 @@ xfs_attri_item_recover(
 	args->namelen = nv->name.i_len;
 	args->hashval = xfs_da_hashname(args->name, args->namelen);
 	args->attr_filter = attrp->alfi_attr_filter & XFS_ATTRI_FILTER_MASK;
-	args->op_flags = XFS_DA_OP_RECOVERY | XFS_DA_OP_OKNOENT;
+	args->op_flags = XFS_DA_OP_RECOVERY | XFS_DA_OP_OKNOENT |
+			 XFS_DA_OP_LOGGED;
+
+	ASSERT(xfs_sb_version_haslogxattrs(&mp->m_sb));
 
 	switch (attr->xattri_op_flags) {
 	case XFS_ATTRI_OP_FLAGS_SET:

fs/xfs/xfs_ioctl.c

@@ -1096,7 +1096,8 @@ xfs_flags2diflags2(
 {
 	uint64_t		di_flags2 =
 		(ip->i_diflags2 & (XFS_DIFLAG2_REFLINK |
-				   XFS_DIFLAG2_BIGTIME));
+				   XFS_DIFLAG2_BIGTIME |
+				   XFS_DIFLAG2_NREXT64));
 
 	if (xflags & FS_XFLAG_DAX)
 		di_flags2 |= XFS_DIFLAG2_DAX;

fs/xfs/xfs_xattr.c

@@ -68,6 +68,18 @@ xfs_attr_rele_log_assist(
 	xlog_drop_incompat_feat(mp->m_log);
 }
 
+static inline bool
+xfs_attr_want_log_assist(
+	struct xfs_mount	*mp)
+{
+#ifdef DEBUG
+	/* Logged xattrs require a V5 super for log_incompat */
+	return xfs_has_crc(mp) && xfs_globals.larp;
+#else
+	return false;
+#endif
+}
+
 /*
  * Set or remove an xattr, having grabbed the appropriate logging resources
  * prior to calling libxfs.
@@ -80,11 +92,14 @@ xfs_attr_change(
 	bool			use_logging = false;
 	int			error;
 
-	if (xfs_has_larp(mp)) {
+	ASSERT(!(args->op_flags & XFS_DA_OP_LOGGED));
+
+	if (xfs_attr_want_log_assist(mp)) {
 		error = xfs_attr_grab_log_assist(mp);
 		if (error)
 			return error;
 
+		args->op_flags |= XFS_DA_OP_LOGGED;
 		use_logging = true;
 	}