vfs: switch ->show_options() to struct dentry *

[deliverable/linux.git] / fs / btrfs / super.c

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 41495dce4db08d1b08fa0792d60e8cfc58a1a925..ae488aa1966a1b32d6a3c4438424eb690740d4c9 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -40,7 +40,7 @@
 #include <linux/magic.h>
 #include <linux/slab.h>
 #include <linux/cleancache.h>
-#include <linux/mnt_namespace.h>
+#include <linux/ratelimit.h>
 #include "compat.h"
 #include "delayed-inode.h"
 #include "ctree.h"
@@ -661,9 +661,9 @@ int btrfs_sync_fs(struct super_block *sb, int wait)
        return ret;
 }
 
-static int btrfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
 {
-       struct btrfs_root *root = btrfs_sb(vfs->mnt_sb);
+       struct btrfs_root *root = btrfs_sb(dentry->d_sb);
        struct btrfs_fs_info *info = root->fs_info;
        char *compress_type;
 
@@ -825,13 +825,9 @@ static char *setup_root_args(char *args)
 static struct dentry *mount_subvol(const char *subvol_name, int flags,
                                   const char *device_name, char *data)
 {
-       struct super_block *s;
        struct dentry *root;
        struct vfsmount *mnt;
-       struct mnt_namespace *ns_private;
        char *newargs;
-       struct path path;
-       int error;
 
        newargs = setup_root_args(data);
        if (!newargs)
@@ -842,39 +838,17 @@ static struct dentry *mount_subvol(const char *subvol_name, int flags,
        if (IS_ERR(mnt))
                return ERR_CAST(mnt);
 
-       ns_private = create_mnt_ns(mnt);
-       if (IS_ERR(ns_private)) {
-               mntput(mnt);
-               return ERR_CAST(ns_private);
-       }
-
-       /*
-        * This will trigger the automount of the subvol so we can just
-        * drop the mnt we have here and return the dentry that we
-        * found.
-        */
-       error = vfs_path_lookup(mnt->mnt_root, mnt, subvol_name,
-                               LOOKUP_FOLLOW, &path);
-       put_mnt_ns(ns_private);
-       if (error)
-               return ERR_PTR(error);
+       root = mount_subtree(mnt, subvol_name);
 
-       if (!is_subvolume_inode(path.dentry->d_inode)) {
-               path_put(&path);
-               mntput(mnt);
-               error = -EINVAL;
+       if (!IS_ERR(root) && !is_subvolume_inode(root->d_inode)) {
+               struct super_block *s = root->d_sb;
+               dput(root);
+               root = ERR_PTR(-EINVAL);
+               deactivate_locked_super(s);
                printk(KERN_ERR "btrfs: '%s' is not a valid subvolume\n",
                                subvol_name);
-               return ERR_PTR(-EINVAL);
        }
 
-       /* Get a ref to the sb and the dentry we found and return it */
-       s = path.mnt->mnt_sb;
-       atomic_inc(&s->s_active);
-       root = dget(path.dentry);
-       path_put(&path);
-       down_write(&s->s_umount);
-
        return root;
 }
 
@@ -1297,6 +1271,16 @@ static int btrfs_unfreeze(struct super_block *sb)
        return 0;
 }
 
+static void btrfs_fs_dirty_inode(struct inode *inode, int flags)
+{
+       int ret;
+
+       ret = btrfs_dirty_inode(inode);
+       if (ret)
+               printk_ratelimited(KERN_ERR "btrfs: fail to dirty inode %Lu "
+                                  "error %d\n", btrfs_ino(inode), ret);
+}
+
 static const struct super_operations btrfs_super_ops = {
        .drop_inode     = btrfs_drop_inode,
        .evict_inode    = btrfs_evict_inode,
@@ -1304,7 +1288,7 @@ static const struct super_operations btrfs_super_ops = {
        .sync_fs        = btrfs_sync_fs,
        .show_options   = btrfs_show_options,
        .write_inode    = btrfs_write_inode,
-       .dirty_inode    = btrfs_dirty_inode,
+       .dirty_inode    = btrfs_fs_dirty_inode,
        .alloc_inode    = btrfs_alloc_inode,
        .destroy_inode  = btrfs_destroy_inode,
        .statfs         = btrfs_statfs,