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From: Pawel Jakub Dawidek <pjd@FreeBSD.org>
Date: Mon, 7 Sep 2009 18:23:26 +0000 (UTC)
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Subject: svn commit: r196943 - head/sys/cddl/compat/opensolaris/kern
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Author: pjd
Date: Mon Sep  7 18:23:26 2009
New Revision: 196943
URL: http://svn.freebsd.org/changeset/base/196943

Log:
  - Avoid holding mutex around M_WAITOK allocations.
  - Add locking for mnt_opt field.
  
  MFC after:	1 week

Modified:
  head/sys/cddl/compat/opensolaris/kern/opensolaris_vfs.c

Modified: head/sys/cddl/compat/opensolaris/kern/opensolaris_vfs.c
==============================================================================
--- head/sys/cddl/compat/opensolaris/kern/opensolaris_vfs.c	Mon Sep  7 17:54:20 2009	(r196942)
+++ head/sys/cddl/compat/opensolaris/kern/opensolaris_vfs.c	Mon Sep  7 18:23:26 2009	(r196943)
@@ -45,20 +45,33 @@ vfs_setmntopt(vfs_t *vfsp, const char *n
 {
 	struct vfsopt *opt;
 	size_t namesize;
+	int locked;
+
+	if (!(locked = mtx_owned(MNT_MTX(vfsp))))
+		MNT_ILOCK(vfsp);
 
 	if (vfsp->mnt_opt == NULL) {
-		vfsp->mnt_opt = malloc(sizeof(*vfsp->mnt_opt), M_MOUNT, M_WAITOK);
-		TAILQ_INIT(vfsp->mnt_opt);
+		void *opts;
+
+		MNT_IUNLOCK(vfsp);
+		opts = malloc(sizeof(*vfsp->mnt_opt), M_MOUNT, M_WAITOK);
+		MNT_ILOCK(vfsp);
+		if (vfsp->mnt_opt == NULL) {
+			vfsp->mnt_opt = opts;
+			TAILQ_INIT(vfsp->mnt_opt);
+		} else {
+			free(opts, M_MOUNT);
+		}
 	}
 
-	opt = malloc(sizeof(*opt), M_MOUNT, M_WAITOK);
+	MNT_IUNLOCK(vfsp);
 
+	opt = malloc(sizeof(*opt), M_MOUNT, M_WAITOK);
 	namesize = strlen(name) + 1;
 	opt->name = malloc(namesize, M_MOUNT, M_WAITOK);
 	strlcpy(opt->name, name, namesize);
 	opt->pos = -1;
 	opt->seen = 1;
-
 	if (arg == NULL) {
 		opt->value = NULL;
 		opt->len = 0;
@@ -67,16 +80,23 @@ vfs_setmntopt(vfs_t *vfsp, const char *n
 		opt->value = malloc(opt->len, M_MOUNT, M_WAITOK);
 		bcopy(arg, opt->value, opt->len);
 	}
-	/* TODO: Locking. */
+
+	MNT_ILOCK(vfsp);
 	TAILQ_INSERT_TAIL(vfsp->mnt_opt, opt, link);
+	if (!locked)
+		MNT_IUNLOCK(vfsp);
 }
 
 void
 vfs_clearmntopt(vfs_t *vfsp, const char *name)
 {
+	int locked;
 
-	/* TODO: Locking. */
+	if (!(locked = mtx_owned(MNT_MTX(vfsp))))
+		MNT_ILOCK(vfsp);
 	vfs_deleteopt(vfsp->mnt_opt, name);
+	if (!locked)
+		MNT_IUNLOCK(vfsp);
 }
 
 int