#include "export.h"
#include "compat.h"
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,28)
-#define FILEID_BTRFS_WITHOUT_PARENT 0x4d
-#define FILEID_BTRFS_WITH_PARENT 0x4e
-#define FILEID_BTRFS_WITH_PARENT_ROOT 0x4f
-#endif
-
-#define BTRFS_FID_SIZE_NON_CONNECTABLE (offsetof(struct btrfs_fid, parent_objectid)/4)
-#define BTRFS_FID_SIZE_CONNECTABLE (offsetof(struct btrfs_fid, parent_root_objectid)/4)
-#define BTRFS_FID_SIZE_CONNECTABLE_ROOT (sizeof(struct btrfs_fid)/4)
+#define BTRFS_FID_SIZE_NON_CONNECTABLE (offsetof(struct btrfs_fid, \
+ parent_objectid) / 4)
+#define BTRFS_FID_SIZE_CONNECTABLE (offsetof(struct btrfs_fid, \
+ parent_root_objectid) / 4)
+#define BTRFS_FID_SIZE_CONNECTABLE_ROOT (sizeof(struct btrfs_fid) / 4)
static int btrfs_encode_fh(struct dentry *dentry, u32 *fh, int *max_len,
int connectable)
{
struct btrfs_root *root;
struct inode *inode;
- struct dentry *result;
struct btrfs_key key;
key.objectid = root_objectid;
return ERR_PTR(-ESTALE);
}
- result = d_obtain_alias(inode);
- if (!result)
- return ERR_PTR(-ENOMEM);
-
- return result;
+ return d_obtain_alias(inode);
}
static struct dentry *btrfs_fh_to_parent(struct super_block *sb, struct fid *fh,
static struct dentry *btrfs_get_parent(struct dentry *child)
{
struct inode *dir = child->d_inode;
- struct inode *inode;
- struct dentry *parent;
struct btrfs_root *root = BTRFS_I(dir)->root;
struct btrfs_key key;
struct btrfs_path *path;
key.offset = (u64)-1;
ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+ if (ret < 0) {
+ /* Error */
+ btrfs_free_path(path);
+ return ERR_PTR(ret);
+ }
leaf = path->nodes[0];
slot = path->slots[0];
- if (ret < 0 || slot == 0) {
- btrfs_free_path(path);
- goto out;
+ if (ret) {
+ /* btrfs_search_slot() returns the slot where we'd want to
+ insert a backref for parent inode #0xFFFFFFFFFFFFFFFF.
+ The _real_ backref, telling us what the parent inode
+ _actually_ is, will be in the slot _before_ the one
+ that btrfs_search_slot() returns. */
+ if (!slot) {
+ /* Unless there is _no_ key in the tree before... */
+ btrfs_free_path(path);
+ return ERR_PTR(-EIO);
+ }
+ slot--;
}
- /* btrfs_search_slot() returns the slot where we'd want to insert
- an INODE_REF_KEY for parent inode #0xFFFFFFFFFFFFFFFF. The _real_
- one, telling us what the parent inode _actually_ is, will be in
- the slot _before_ the one that btrfs_search_slot() returns. */
- slot--;
btrfs_item_key_to_cpu(leaf, &key, slot);
btrfs_free_path(path);
if (key.objectid != dir->i_ino || key.type != BTRFS_INODE_REF_KEY)
- goto out;
+ return ERR_PTR(-EINVAL);
objectid = key.offset;
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
key.offset = 0;
- inode = btrfs_iget(root->fs_info->sb, &key, root, NULL);
-
- parent = d_obtain_alias(inode);
- if (!parent)
- parent = ERR_PTR(-ENOMEM);
-
- return parent;
-
-out:
- btrfs_free_path(path);
- return ERR_PTR(-EINVAL);
+ return d_obtain_alias(btrfs_iget(root->fs_info->sb, &key, root, NULL));
}
const struct export_operations btrfs_export_ops = {