Btrfs: add a function to lookup a directory path by following backrefs

This will be used by the inode lookup ioctl.

Signed-off-by: TARUISI Hiroaki <taruishi.hiroak@jp.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 92 insertions, 0 deletions

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 645a17927a8f..ac2a28f4fa1a 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -48,6 +48,7 @@
 #include "print-tree.h"
 #include "volumes.h"
 #include "locking.h"
+#include "ctree.h"
 
 /* Mask out flags that are inappropriate for the given type of inode. */
 static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags)
@@ -743,6 +744,97 @@ out:
         return ret;
 }
 
+/*
+  Search INODE_REFs to identify path name of 'dirid' directory
+  in a 'tree_id' tree. and sets path name to 'name'.
+*/
+static noinline int btrfs_search_path_in_tree(struct btrfs_fs_info *info,
+                                u64 tree_id, u64 dirid, char *name)
+{
+        struct btrfs_root *root;
+        struct btrfs_key key;
+        char *name_stack, *ptr;
+        int ret = -1;
+        int slot;
+        int len;
+        int total_len = 0;
+        struct btrfs_inode_ref *iref;
+        struct extent_buffer *l;
+        struct btrfs_path *path;
+
+        if (dirid == BTRFS_FIRST_FREE_OBJECTID) {
+                name[0]='\0';
+                return 0;
+        }
+
+        path = btrfs_alloc_path();
+        if (!path)
+                return -ENOMEM;
+
+        name_stack = kzalloc(BTRFS_PATH_NAME_MAX+1, GFP_NOFS);
+        if (!name_stack) {
+                btrfs_free_path(path);
+                return -ENOMEM;
+        }
+
+        ptr = &name_stack[BTRFS_PATH_NAME_MAX];
+
+        key.objectid = tree_id;
+        key.type = BTRFS_ROOT_ITEM_KEY;
+        key.offset = (u64)-1;
+        root = btrfs_read_fs_root_no_name(info, &key);
+        if (IS_ERR(root)) {
+                printk(KERN_ERR "could not find root %llu\n", tree_id);
+                return -ENOENT;
+        }
+
+        key.objectid = dirid;
+        key.type = BTRFS_INODE_REF_KEY;
+        key.offset = 0;
+
+        while(1) {
+                ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
+                if (ret < 0)
+                        goto out;
+
+                l = path->nodes[0];
+                slot = path->slots[0];
+                btrfs_item_key_to_cpu(l, &key, slot);
+
+                if (ret > 0 && (key.objectid != dirid ||
+                                        key.type != BTRFS_INODE_REF_KEY))
+                        goto out;
+
+                iref = btrfs_item_ptr(l, slot, struct btrfs_inode_ref);
+                len = btrfs_inode_ref_name_len(l, iref);
+                ptr -= len + 1;
+                total_len += len + 1;
+                if (ptr < name_stack)
+                        goto out;
+
+                *(ptr + len) = '/';
+                read_extent_buffer(l, ptr,(unsigned long)(iref + 1), len);
+
+                if (key.offset == BTRFS_FIRST_FREE_OBJECTID)
+                        break;
+
+                btrfs_release_path(root, path);
+                key.objectid = key.offset;
+                key.offset = 0;
+                dirid = key.objectid;
+
+        }
+        if (ptr < name_stack)
+                goto out;
+        strncpy(name, ptr, total_len);
+        name[total_len]='\0';
+        ret = 0;
+out:
+        btrfs_free_path(path);
+        kfree(name_stack);
+        return ret;
+}
+
 static noinline int btrfs_ioctl_snap_destroy(struct file *file,
                                              void __user *arg)
 {