Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs...
[~shefty/rdma-dev.git] / fs / btrfs / super.c
index ebe46c628748336eddee1e70502f2a8e08709f38..8299a25ffc8f8313064cbd3e54278e9f5ebbc662 100644 (file)
@@ -61,6 +61,8 @@ static void btrfs_put_super(struct super_block *sb)
 
        ret = close_ctree(root);
        sb->s_fs_info = NULL;
+
+       (void)ret; /* FIXME: need to fix VFS to return error? */
 }
 
 enum {
@@ -68,7 +70,8 @@ enum {
        Opt_nodatacow, Opt_max_inline, Opt_alloc_start, Opt_nobarrier, Opt_ssd,
        Opt_nossd, Opt_ssd_spread, Opt_thread_pool, Opt_noacl, Opt_compress,
        Opt_compress_force, Opt_notreelog, Opt_ratio, Opt_flushoncommit,
-       Opt_discard, Opt_err,
+       Opt_discard, Opt_space_cache, Opt_clear_cache, Opt_err,
+       Opt_user_subvol_rm_allowed,
 };
 
 static match_table_t tokens = {
@@ -92,6 +95,9 @@ static match_table_t tokens = {
        {Opt_flushoncommit, "flushoncommit"},
        {Opt_ratio, "metadata_ratio=%d"},
        {Opt_discard, "discard"},
+       {Opt_space_cache, "space_cache"},
+       {Opt_clear_cache, "clear_cache"},
+       {Opt_user_subvol_rm_allowed, "user_subvol_rm_allowed"},
        {Opt_err, NULL},
 };
 
@@ -235,6 +241,16 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
                case Opt_discard:
                        btrfs_set_opt(info->mount_opt, DISCARD);
                        break;
+               case Opt_space_cache:
+                       printk(KERN_INFO "btrfs: enabling disk space caching\n");
+                       btrfs_set_opt(info->mount_opt, SPACE_CACHE);
+               case Opt_clear_cache:
+                       printk(KERN_INFO "btrfs: force clearing of disk cache\n");
+                       btrfs_set_opt(info->mount_opt, CLEAR_CACHE);
+                       break;
+               case Opt_user_subvol_rm_allowed:
+                       btrfs_set_opt(info->mount_opt, USER_SUBVOL_RM_ALLOWED);
+                       break;
                case Opt_err:
                        printk(KERN_INFO "btrfs: unrecognized mount option "
                               "'%s'\n", p);
@@ -380,7 +396,7 @@ static struct dentry *get_default_root(struct super_block *sb,
 find_root:
        new_root = btrfs_read_fs_root_no_name(root->fs_info, &location);
        if (IS_ERR(new_root))
-               return ERR_PTR(PTR_ERR(new_root));
+               return ERR_CAST(new_root);
 
        if (btrfs_root_refs(&new_root->root_item) == 0)
                return ERR_PTR(-ENOENT);
@@ -436,7 +452,6 @@ static int btrfs_fill_super(struct super_block *sb,
 {
        struct inode *inode;
        struct dentry *root_dentry;
-       struct btrfs_super_block *disk_super;
        struct btrfs_root *tree_root;
        struct btrfs_key key;
        int err;
@@ -458,7 +473,6 @@ static int btrfs_fill_super(struct super_block *sb,
                return PTR_ERR(tree_root);
        }
        sb->s_fs_info = tree_root;
-       disk_super = &tree_root->fs_info->super_copy;
 
        key.objectid = BTRFS_FIRST_FREE_OBJECTID;
        key.type = BTRFS_INODE_ITEM_KEY;
@@ -571,7 +585,6 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
        char *subvol_name = NULL;
        u64 subvol_objectid = 0;
        int error = 0;
-       int found = 0;
 
        if (!(flags & MS_RDONLY))
                mode |= FMODE_WRITE;
@@ -607,7 +620,6 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
                        goto error_close_devices;
                }
 
-               found = 1;
                btrfs_close_devices(fs_devices);
        } else {
                char b[BDEVNAME_SIZE];
@@ -629,7 +641,7 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
        if (IS_ERR(root)) {
                error = PTR_ERR(root);
                deactivate_locked_super(s);
-               goto error;
+               goto error_free_subvol_name;
        }
        /* if they gave us a subvolume name bind mount into that */
        if (strcmp(subvol_name, ".")) {
@@ -643,14 +655,14 @@ static struct dentry *btrfs_mount(struct file_system_type *fs_type, int flags,
                        deactivate_locked_super(s);
                        error = PTR_ERR(new_root);
                        dput(root);
-                       goto error_close_devices;
+                       goto error_free_subvol_name;
                }
                if (!new_root->d_inode) {
                        dput(root);
                        dput(new_root);
                        deactivate_locked_super(s);
                        error = -ENXIO;
-                       goto error_close_devices;
+                       goto error_free_subvol_name;
                }
                dput(root);
                root = new_root;
@@ -665,7 +677,6 @@ error_close_devices:
        btrfs_close_devices(fs_devices);
 error_free_subvol_name:
        kfree(subvol_name);
-error:
        return ERR_PTR(error);
 }
 
@@ -713,18 +724,25 @@ static int btrfs_statfs(struct dentry *dentry, struct kstatfs *buf)
        struct list_head *head = &root->fs_info->space_info;
        struct btrfs_space_info *found;
        u64 total_used = 0;
+       u64 total_used_data = 0;
        int bits = dentry->d_sb->s_blocksize_bits;
        __be32 *fsid = (__be32 *)root->fs_info->fsid;
 
        rcu_read_lock();
-       list_for_each_entry_rcu(found, head, list)
+       list_for_each_entry_rcu(found, head, list) {
+               if (found->flags & (BTRFS_BLOCK_GROUP_METADATA |
+                                   BTRFS_BLOCK_GROUP_SYSTEM))
+                       total_used_data += found->disk_total;
+               else
+                       total_used_data += found->disk_used;
                total_used += found->disk_used;
+       }
        rcu_read_unlock();
 
        buf->f_namelen = BTRFS_NAME_LEN;
        buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
        buf->f_bfree = buf->f_blocks - (total_used >> bits);
-       buf->f_bavail = buf->f_bfree;
+       buf->f_bavail = buf->f_blocks - (total_used_data >> bits);
        buf->f_bsize = dentry->d_sb->s_blocksize;
        buf->f_type = BTRFS_SUPER_MAGIC;