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authorChris Mason <chris.mason@oracle.com>2007-03-15 12:56:47 -0400
committerDavid Woodhouse <dwmw2@hera.kernel.org>2007-03-15 12:56:47 -0400
commit62e2749e03a855d98855f9ce032dbe72d5fad148 (patch)
treeed12521d1bde4ac7eda7f917b57b3cab1e76539d /fs/btrfs/dir-item.c
parenta1516c8921ce2c148b69493e858d95bc79c92f01 (diff)
Btrfs: Use a chunk of the key flags to record the item type.
Add (untested and simple) directory item code Fix comp_keys to use the new key ordering Add btrfs_insert_empty_item Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/dir-item.c')
-rw-r--r--fs/btrfs/dir-item.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/fs/btrfs/dir-item.c b/fs/btrfs/dir-item.c
new file mode 100644
index 00000000000..2a888e97e1a
--- /dev/null
+++ b/fs/btrfs/dir-item.c
@@ -0,0 +1,102 @@
1#include <stdio.h>
2#include <stdlib.h>
3#include "kerncompat.h"
4#include "radix-tree.h"
5#include "ctree.h"
6#include "disk-io.h"
7#include "hash.h"
8
9int btrfs_insert_dir_item(struct btrfs_root *root, char *name, int name_len,
10 u64 dir, u64 objectid, u8 type)
11{
12 int ret = 0;
13 struct btrfs_path path;
14 struct btrfs_dir_item *dir_item;
15 char *name_ptr;
16 struct btrfs_key key;
17 u32 data_size;
18
19 key.objectid = dir;
20 key.flags = 0;
21 ret = btrfs_name_hash(name, name_len, &key.offset);
22 BUG_ON(ret);
23 btrfs_init_path(&path);
24 data_size = sizeof(*dir_item) + name_len;
25 ret = btrfs_insert_empty_item(root, &path, &key, data_size);
26 if (ret)
27 goto out;
28
29 dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
30 struct btrfs_dir_item);
31 btrfs_set_dir_objectid(dir_item, objectid);
32 btrfs_set_dir_type(dir_item, type);
33 btrfs_set_dir_flags(dir_item, 0);
34 name_ptr = (char *)(dir_item + 1);
35 memcpy(name_ptr, name, name_len);
36out:
37 btrfs_release_path(root, &path);
38 return ret;
39}
40
41int btrfs_del_dir_item(struct btrfs_root *root, u64 dir, char *name,
42 int name_len)
43{
44 int ret = 0;
45 struct btrfs_path path;
46 struct btrfs_key key;
47
48 key.objectid = dir;
49 key.flags = 0;
50 ret = btrfs_name_hash(name, name_len, &key.offset);
51 BUG_ON(ret);
52 btrfs_init_path(&path);
53 ret = btrfs_search_slot(root, &key, &path, 0, 1);
54 if (ret)
55 goto out;
56 ret = btrfs_del_item(root, &path);
57out:
58 btrfs_release_path(root, &path);
59 return ret;
60}
61
62int btrfs_lookup_dir_item(struct btrfs_root *root, u64 dir, char *name,
63 int name_len, u64 *objectid)
64{
65 int ret = 0;
66 struct btrfs_path path;
67 struct btrfs_dir_item *dir_item;
68 char *name_ptr;
69 struct btrfs_key key;
70 u32 item_len;
71 struct btrfs_item *item;
72
73 key.objectid = dir;
74 key.flags = 0;
75 ret = btrfs_name_hash(name, name_len, &key.offset);
76 BUG_ON(ret);
77 btrfs_init_path(&path);
78 ret = btrfs_search_slot(root, &key, &path, 0, 0);
79 if (ret)
80 goto out;
81
82 dir_item = btrfs_item_ptr(&path.nodes[0]->leaf, path.slots[0],
83 struct btrfs_dir_item);
84
85 item = path.nodes[0]->leaf.items + path.slots[0];
86 item_len = btrfs_item_size(item);
87 if (item_len != name_len + sizeof(struct btrfs_dir_item)) {
88 BUG();
89 ret = 1;
90 goto out;
91 }
92 name_ptr = (char *)(dir_item + 1);
93 if (memcmp(name_ptr, name, name_len)) {
94 BUG();
95 ret = 1;
96 goto out;
97 }
98 *objectid = btrfs_dir_objectid(dir_item);
99out:
100 btrfs_release_path(root, &path);
101 return ret;
102}