Merge branch 'btrfs' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[~shefty/rdma-dev.git] / fs / btrfs / disk-io.c
index 89e99eb384db54a8006ae991bd83ea2e61abe0eb..7aa9cd36bf1b496efd2a02e7cc86c1a08a29c663 100644 (file)
@@ -1144,7 +1144,6 @@ static int __setup_root(u32 nodesize, u32 leafsize, u32 sectorsize,
        root->orphan_item_inserted = 0;
        root->orphan_cleanup_state = 0;
 
-       root->fs_info = fs_info;
        root->objectid = objectid;
        root->last_trans = 0;
        root->highest_objectid = 0;
@@ -1218,6 +1217,14 @@ static int find_and_setup_root(struct btrfs_root *tree_root,
        return 0;
 }
 
+static struct btrfs_root *btrfs_alloc_root(struct btrfs_fs_info *fs_info)
+{
+       struct btrfs_root *root = kzalloc(sizeof(*root), GFP_NOFS);
+       if (root)
+               root->fs_info = fs_info;
+       return root;
+}
+
 static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
                                         struct btrfs_fs_info *fs_info)
 {
@@ -1225,7 +1232,7 @@ static struct btrfs_root *alloc_log_tree(struct btrfs_trans_handle *trans,
        struct btrfs_root *tree_root = fs_info->tree_root;
        struct extent_buffer *leaf;
 
-       root = kzalloc(sizeof(*root), GFP_NOFS);
+       root = btrfs_alloc_root(fs_info);
        if (!root)
                return ERR_PTR(-ENOMEM);
 
@@ -1320,7 +1327,7 @@ struct btrfs_root *btrfs_read_fs_root_no_radix(struct btrfs_root *tree_root,
        u32 blocksize;
        int ret = 0;
 
-       root = kzalloc(sizeof(*root), GFP_NOFS);
+       root = btrfs_alloc_root(fs_info);
        if (!root)
                return ERR_PTR(-ENOMEM);
        if (location->offset == (u64)-1) {
@@ -1876,9 +1883,9 @@ static void free_root_pointers(struct btrfs_fs_info *info, int chunk_root)
 }
 
 
-struct btrfs_root *open_ctree(struct super_block *sb,
-                             struct btrfs_fs_devices *fs_devices,
-                             char *options)
+int open_ctree(struct super_block *sb,
+              struct btrfs_fs_devices *fs_devices,
+              char *options)
 {
        u32 sectorsize;
        u32 nodesize;
@@ -1890,8 +1897,8 @@ struct btrfs_root *open_ctree(struct super_block *sb,
        struct btrfs_key location;
        struct buffer_head *bh;
        struct btrfs_super_block *disk_super;
-       struct btrfs_root *tree_root = btrfs_sb(sb);
-       struct btrfs_fs_info *fs_info = tree_root->fs_info;
+       struct btrfs_fs_info *fs_info = btrfs_sb(sb);
+       struct btrfs_root *tree_root;
        struct btrfs_root *extent_root;
        struct btrfs_root *csum_root;
        struct btrfs_root *chunk_root;
@@ -1902,16 +1909,14 @@ struct btrfs_root *open_ctree(struct super_block *sb,
        int num_backups_tried = 0;
        int backup_index = 0;
 
-       extent_root = fs_info->extent_root =
-               kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
-       csum_root = fs_info->csum_root =
-               kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
-       chunk_root = fs_info->chunk_root =
-               kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
-       dev_root = fs_info->dev_root =
-               kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+       tree_root = fs_info->tree_root = btrfs_alloc_root(fs_info);
+       extent_root = fs_info->extent_root = btrfs_alloc_root(fs_info);
+       csum_root = fs_info->csum_root = btrfs_alloc_root(fs_info);
+       chunk_root = fs_info->chunk_root = btrfs_alloc_root(fs_info);
+       dev_root = fs_info->dev_root = btrfs_alloc_root(fs_info);
 
-       if (!extent_root || !csum_root || !chunk_root || !dev_root) {
+       if (!tree_root || !extent_root || !csum_root ||
+           !chunk_root || !dev_root) {
                err = -ENOMEM;
                goto fail;
        }
@@ -2389,7 +2394,7 @@ retry_root_backup:
                     btrfs_level_size(tree_root,
                                      btrfs_super_log_root_level(disk_super));
 
-               log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS);
+               log_tree_root = btrfs_alloc_root(fs_info);
                if (!log_tree_root) {
                        err = -ENOMEM;
                        goto fail_trans_kthread;
@@ -2450,11 +2455,11 @@ retry_root_backup:
 
                if (err) {
                        close_ctree(tree_root);
-                       return ERR_PTR(err);
+                       return err;
                }
        }
 
-       return tree_root;
+       return 0;
 
 fail_trans_kthread:
        kthread_stop(fs_info->transaction_kthread);
@@ -2500,8 +2505,7 @@ fail_srcu:
        cleanup_srcu_struct(&fs_info->subvol_srcu);
 fail:
        btrfs_close_devices(fs_info->fs_devices);
-       free_fs_info(fs_info);
-       return ERR_PTR(err);
+       return err;
 
 recovery_tree_root:
        if (!btrfs_test_opt(tree_root, RECOVERY))
@@ -3007,7 +3011,7 @@ int close_ctree(struct btrfs_root *root)
                   (atomic_read(&fs_info->defrag_running) == 0));
 
        /* clear out the rbtree of defraggable inodes */
-       btrfs_run_defrag_inodes(root->fs_info);
+       btrfs_run_defrag_inodes(fs_info);
 
        /*
         * Here come 2 situations when btrfs is broken to flip readonly:
@@ -3036,8 +3040,8 @@ int close_ctree(struct btrfs_root *root)
 
        btrfs_put_block_group_cache(fs_info);
 
-       kthread_stop(root->fs_info->transaction_kthread);
-       kthread_stop(root->fs_info->cleaner_kthread);
+       kthread_stop(fs_info->transaction_kthread);
+       kthread_stop(fs_info->cleaner_kthread);
 
        fs_info->closing = 2;
        smp_mb();
@@ -3055,14 +3059,14 @@ int close_ctree(struct btrfs_root *root)
        free_extent_buffer(fs_info->extent_root->commit_root);
        free_extent_buffer(fs_info->tree_root->node);
        free_extent_buffer(fs_info->tree_root->commit_root);
-       free_extent_buffer(root->fs_info->chunk_root->node);
-       free_extent_buffer(root->fs_info->chunk_root->commit_root);
-       free_extent_buffer(root->fs_info->dev_root->node);
-       free_extent_buffer(root->fs_info->dev_root->commit_root);
-       free_extent_buffer(root->fs_info->csum_root->node);
-       free_extent_buffer(root->fs_info->csum_root->commit_root);
+       free_extent_buffer(fs_info->chunk_root->node);
+       free_extent_buffer(fs_info->chunk_root->commit_root);
+       free_extent_buffer(fs_info->dev_root->node);
+       free_extent_buffer(fs_info->dev_root->commit_root);
+       free_extent_buffer(fs_info->csum_root->node);
+       free_extent_buffer(fs_info->csum_root->commit_root);
 
-       btrfs_free_block_groups(root->fs_info);
+       btrfs_free_block_groups(fs_info);
 
        del_fs_roots(fs_info);
 
@@ -3093,8 +3097,6 @@ int close_ctree(struct btrfs_root *root)
        bdi_destroy(&fs_info->bdi);
        cleanup_srcu_struct(&fs_info->subvol_srcu);
 
-       free_fs_info(fs_info);
-
        return 0;
 }