Merge branch 'bug-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/josef/btrfs...

[pandora-kernel.git] / fs / btrfs / super.c

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 1776dbd..65b62da 100644 (file)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -68,7 +68,7 @@ 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,
 };
 
 static match_table_t tokens = {
@@ -92,6 +92,8 @@ 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_err, NULL},
 };
 
@@ -235,6 +237,13 @@ 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_err:
                        printk(KERN_INFO "btrfs: unrecognized mount option "
                               "'%s'\n", p);
@@ -629,7 +638,7 @@ static int btrfs_get_sb(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 +652,14 @@ static int btrfs_get_sb(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;
@@ -668,7 +677,6 @@ error_close_devices:
        btrfs_close_devices(fs_devices);
 error_free_subvol_name:
        kfree(subvol_name);
-error:
        return error;
 }
 
@@ -716,18 +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;