reiserfs: locking, push write lock out of xattr code

The reiserfs xattr code doesn't need the write lock and sleeps all over
the place. We can simplify the locking by releasing it and reacquiring
after the xattr call.

Signed-off-by: Jeff Mahoney <jeffm@suse.com>

1 files changed, 23 insertions, 25 deletions

diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index f8a23c3078f..7e81d977491 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -1335,7 +1335,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 				kfree(qf_names[i]);
 #endif
 		err = -EINVAL;
-		goto out_unlock;
+		goto out_err_unlock;
 	}
 #ifdef CONFIG_QUOTA
 	handle_quota_files(s, qf_names, &qfmt);
@@ -1379,35 +1379,32 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	if (blocks) {
 		err = reiserfs_resize(s, blocks);
 		if (err != 0)
-			goto out_unlock;
+			goto out_err_unlock;
 	}
 
 	if (*mount_flags & MS_RDONLY) {
+		reiserfs_write_unlock(s);
 		reiserfs_xattr_init(s, *mount_flags);
 		/* remount read-only */
 		if (s->s_flags & MS_RDONLY)
 			/* it is read-only already */
-			goto out_ok;
+			goto out_ok_unlocked;
 
-		/*
-		 * Drop write lock. Quota will retake it when needed and lock
-		 * ordering requires calling dquot_suspend() without it.
-		 */
-		reiserfs_write_unlock(s);
 		err = dquot_suspend(s, -1);
 		if (err < 0)
 			goto out_err;
-		reiserfs_write_lock(s);
 
 		/* try to remount file system with read-only permissions */
 		if (sb_umount_state(rs) == REISERFS_VALID_FS
 		    || REISERFS_SB(s)->s_mount_state != REISERFS_VALID_FS) {
-			goto out_ok;
+			goto out_ok_unlocked;
 		}
 
+		reiserfs_write_lock(s);
+
 		err = journal_begin(&th, s, 10);
 		if (err)
-			goto out_unlock;
+			goto out_err_unlock;
 
 		/* Mounting a rw partition read-only. */
 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
@@ -1416,13 +1413,14 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	} else {
 		/* remount read-write */
 		if (!(s->s_flags & MS_RDONLY)) {
+			reiserfs_write_unlock(s);
 			reiserfs_xattr_init(s, *mount_flags);
-			goto out_ok;	/* We are read-write already */
+			goto out_ok_unlocked;	/* We are read-write already */
 		}
 
 		if (reiserfs_is_journal_aborted(journal)) {
 			err = journal->j_errno;
-			goto out_unlock;
+			goto out_err_unlock;
 		}
 
 		handle_data_mode(s, mount_options);
@@ -1431,7 +1429,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 		s->s_flags &= ~MS_RDONLY;	/* now it is safe to call journal_begin */
 		err = journal_begin(&th, s, 10);
 		if (err)
-			goto out_unlock;
+			goto out_err_unlock;
 
 		/* Mount a partition which is read-only, read-write */
 		reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
@@ -1448,26 +1446,22 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
 	SB_JOURNAL(s)->j_must_wait = 1;
 	err = journal_end(&th, s, 10);
 	if (err)
-		goto out_unlock;
+		goto out_err_unlock;
 
+	reiserfs_write_unlock(s);
 	if (!(*mount_flags & MS_RDONLY)) {
-		/*
-		 * Drop write lock. Quota will retake it when needed and lock
-		 * ordering requires calling dquot_resume() without it.
-		 */
-		reiserfs_write_unlock(s);
 		dquot_resume(s, -1);
 		reiserfs_write_lock(s);
 		finish_unfinished(s);
+		reiserfs_write_unlock(s);
 		reiserfs_xattr_init(s, *mount_flags);
 	}
 
-out_ok:
+out_ok_unlocked:
 	replace_mount_options(s, new_opts);
-	reiserfs_write_unlock(s);
 	return 0;
 
-out_unlock:
+out_err_unlock:
 	reiserfs_write_unlock(s);
 out_err:
 	kfree(new_opts);
@@ -2014,12 +2008,14 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
 			goto error;
 		}
 
+		reiserfs_write_unlock(s);
 		if ((errval = reiserfs_lookup_privroot(s)) ||
 		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
 			dput(s->s_root);
 			s->s_root = NULL;
-			goto error;
+			goto error_unlocked;
 		}
+		reiserfs_write_lock(s);
 
 		/* look for files which were to be removed in previous session */
 		finish_unfinished(s);
@@ -2028,12 +2024,14 @@ static int reiserfs_fill_super(struct super_block *s, void *data, int silent)
 			reiserfs_info(s, "using 3.5.x disk format\n");
 		}
 
+		reiserfs_write_unlock(s);
 		if ((errval = reiserfs_lookup_privroot(s)) ||
 		    (errval = reiserfs_xattr_init(s, s->s_flags))) {
 			dput(s->s_root);
 			s->s_root = NULL;
-			goto error;
+			goto error_unlocked;
 		}
+		reiserfs_write_lock(s);
 	}
 	// mark hash in super block: it could be unset. overwrite should be ok
 	set_sb_hash_function_code(rs, function2code(sbi->s_hash_function));