* Boston, MA 021110-1307, USA.
*/
-#include <stdio.h>
-#include <stdlib.h>
-#include "kerncompat.h"
-#include "radix-tree.h"
+#include <linux/limits.h>
#include "ctree.h"
#include "disk-io.h"
#include "hash.h"
#include "transaction.h"
-static struct btrfs_dir_item *insert_with_overflow(struct
- btrfs_trans_handle *trans,
+static struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
+ struct btrfs_path *path,
+ const char *name, int name_len);
+
+static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
+ *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct btrfs_key *cpu_key,
- u32 data_size)
+ u32 data_size,
+ const char *name,
+ int name_len)
{
int ret;
char *ptr;
struct btrfs_item *item;
- struct btrfs_leaf *leaf;
+ struct extent_buffer *leaf;
ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
if (ret == -EEXIST) {
- ret = btrfs_extend_item(trans, root, path, data_size);
- BUG_ON(ret > 0);
- if (ret)
- return NULL;
+ struct btrfs_dir_item *di;
+ di = btrfs_match_dir_item_name(root, path, name, name_len);
+ if (di)
+ return ERR_PTR(-EEXIST);
+ ret = btrfs_extend_item(root, path, data_size);
+ WARN_ON(ret > 0);
}
- BUG_ON(ret > 0);
- leaf = &path->nodes[0]->leaf;
- item = leaf->items + path->slots[0];
+ if (ret < 0)
+ return ERR_PTR(ret);
+ WARN_ON(ret > 0);
+ leaf = path->nodes[0];
+ item = btrfs_item_nr(path->slots[0]);
ptr = btrfs_item_ptr(leaf, path->slots[0], char);
- BUG_ON(data_size > btrfs_item_size(item));
- ptr += btrfs_item_size(item) - data_size;
+ BUG_ON(data_size > btrfs_item_size(leaf, item));
+ ptr += btrfs_item_size(leaf, item) - data_size;
return (struct btrfs_dir_item *)ptr;
}
+int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, const char *name,
+ u16 name_len, const void *data, u16 data_len,
+ u64 dir)
+{
+ int ret = 0;
+ struct btrfs_path *path;
+ struct btrfs_dir_item *dir_item;
+ unsigned long name_ptr, data_ptr;
+ struct btrfs_key key, location;
+ struct btrfs_disk_key disk_key;
+ struct extent_buffer *leaf;
+ u32 data_size;
+
+ key.objectid = dir;
+ key.type = BTRFS_XATTR_ITEM_KEY;
+ key.offset = btrfs_name_hash(name, name_len);
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
+
+ data_size = sizeof(*dir_item) + name_len + data_len;
+ dir_item = insert_with_overflow(trans, root, path, &key, data_size,
+ name, name_len);
+ /*
+ * FIXME: at some point we should handle xattr's that are larger than
+ * what we can fit in our leaf. We set location to NULL b/c we aren't
+ * pointing at anything else, that will change if we store the xattr
+ * data in a separate inode.
+ */
+ BUG_ON(IS_ERR(dir_item));
+ memset(&location, 0, sizeof(location));
+
+ leaf = path->nodes[0];
+ btrfs_cpu_key_to_disk(&disk_key, &location);
+ btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
+ btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR);
+ btrfs_set_dir_name_len(leaf, dir_item, name_len);
+ btrfs_set_dir_data_len(leaf, dir_item, data_len);
+ name_ptr = (unsigned long)(dir_item + 1);
+ data_ptr = (unsigned long)((char *)name_ptr + name_len);
+
+ write_extent_buffer(leaf, name, name_ptr, name_len);
+ write_extent_buffer(leaf, data, data_ptr, data_len);
+ btrfs_mark_buffer_dirty(path->nodes[0]);
+
+ btrfs_free_path(path);
+ return ret;
+}
+
int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, char *name, int name_len, u64 dir,
- struct btrfs_key *location, u8 type)
+ *root, const char *name, int name_len, u64 dir,
+ struct btrfs_key *location, u8 type, u64 index)
{
int ret = 0;
- struct btrfs_path path;
+ int ret2 = 0;
+ struct btrfs_path *path;
struct btrfs_dir_item *dir_item;
- char *name_ptr;
+ struct extent_buffer *leaf;
+ unsigned long name_ptr;
struct btrfs_key key;
+ struct btrfs_disk_key disk_key;
u32 data_size;
key.objectid = dir;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
- if (name_len == 1 && *name == '.')
- key.offset = 1;
- else if (name_len == 2 && name[0] == '.' && name[1] == '.')
- key.offset = 2;
- else
- ret = btrfs_name_hash(name, name_len, &key.offset);
- BUG_ON(ret);
- btrfs_init_path(&path);
+ key.type = BTRFS_DIR_ITEM_KEY;
+ key.offset = btrfs_name_hash(name, name_len);
+ path = btrfs_alloc_path();
+ if (!path)
+ return -ENOMEM;
data_size = sizeof(*dir_item) + name_len;
- dir_item = insert_with_overflow(trans, root, &path, &key, data_size);
- if (!dir_item) {
- ret = -1;
- goto out;
+ dir_item = insert_with_overflow(trans, root, path, &key, data_size,
+ name, name_len);
+ if (IS_ERR(dir_item)) {
+ ret = PTR_ERR(dir_item);
+
+ /* Continue to insert item if existed */
+ if (ret == -EEXIST) {
+ ret = 0;
+ goto insert;
+ } else {
+ goto out;
+ }
}
- btrfs_cpu_key_to_disk(&dir_item->location, location);
- btrfs_set_dir_type(dir_item, type);
- btrfs_set_dir_flags(dir_item, 0);
- btrfs_set_dir_name_len(dir_item, name_len);
- name_ptr = (char *)(dir_item + 1);
- memcpy(name_ptr, name, name_len);
+ leaf = path->nodes[0];
+ btrfs_cpu_key_to_disk(&disk_key, location);
+ btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
+ btrfs_set_dir_type(leaf, dir_item, type);
+ btrfs_set_dir_data_len(leaf, dir_item, 0);
+ btrfs_set_dir_name_len(leaf, dir_item, name_len);
+ name_ptr = (unsigned long)(dir_item + 1);
+
+ write_extent_buffer(leaf, name, name_ptr, name_len);
+ btrfs_mark_buffer_dirty(leaf);
+
+insert:
/* FIXME, use some real flag for selecting the extra index */
- if (root == root->fs_info->tree_root)
+ if (root == root->fs_info->tree_root) {
+ ret = 0;
goto out;
+ }
+ btrfs_release_path(path);
- btrfs_release_path(root, &path);
- btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
- key.offset = location->objectid;
- dir_item = insert_with_overflow(trans, root, &path, &key, data_size);
- if (!dir_item) {
- ret = -1;
+ key.type = BTRFS_DIR_INDEX_KEY;
+ key.offset = index;
+ dir_item = insert_with_overflow(trans, root, path, &key, data_size,
+ name, name_len);
+ if (IS_ERR(dir_item)) {
+ ret2 = PTR_ERR(dir_item);
+ if (ret2 == -EEXIST)
+ ret = 0;
goto out;
}
- btrfs_cpu_key_to_disk(&dir_item->location, location);
- btrfs_set_dir_type(dir_item, type);
- btrfs_set_dir_flags(dir_item, 0);
- btrfs_set_dir_name_len(dir_item, name_len);
- name_ptr = (char *)(dir_item + 1);
- memcpy(name_ptr, name, name_len);
+ leaf = path->nodes[0];
+ btrfs_cpu_key_to_disk(&disk_key, location);
+ btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
+ btrfs_set_dir_type(leaf, dir_item, type);
+ btrfs_set_dir_data_len(leaf, dir_item, 0);
+ btrfs_set_dir_name_len(leaf, dir_item, name_len);
+ name_ptr = (unsigned long)(dir_item + 1);
+ write_extent_buffer(leaf, name, name_ptr, name_len);
+ btrfs_mark_buffer_dirty(leaf);
out:
- btrfs_release_path(root, &path);
- return ret;
+ btrfs_free_path(path);
+ if (ret)
+ return ret;
+ if (ret2)
+ return ret2;
+ return 0;
+}
+
+struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ int mod)
+{
+ int ret;
+ struct btrfs_key key;
+ int ins_len = mod < 0 ? -1 : 0;
+ int cow = mod != 0;
+ struct btrfs_key found_key;
+ struct extent_buffer *leaf;
+
+ key.objectid = dir;
+ key.type = BTRFS_DIR_ITEM_KEY;
+
+ key.offset = btrfs_name_hash(name, name_len);
+
+ ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0) {
+ if (path->slots[0] == 0)
+ return NULL;
+ path->slots[0]--;
+ }
+
+ leaf = path->nodes[0];
+ btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
+
+ if (found_key.objectid != dir ||
+ found_key.type != BTRFS_DIR_ITEM_KEY ||
+ found_key.offset != key.offset)
+ return NULL;
+
+ return btrfs_match_dir_item_name(root, path, name, name_len);
}
-int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
- *root, struct btrfs_path *path, u64 dir, char *name,
- int name_len, int mod)
+struct btrfs_dir_item *btrfs_lookup_dir_index(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path, u64 dir,
+ const char *name, int name_len,
+ u64 index, int mod)
{
int ret;
struct btrfs_key key;
int cow = mod != 0;
key.objectid = dir;
- key.flags = 0;
- btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
- ret = btrfs_name_hash(name, name_len, &key.offset);
- BUG_ON(ret);
+ key.type = BTRFS_DIR_INDEX_KEY;
+ key.offset = index;
+
ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
+ if (ret < 0)
+ return ERR_PTR(ret);
+ if (ret > 0)
+ return ERR_PTR(-ENOENT);
+
+ return btrfs_match_dir_item_name(root, path, name, name_len);
+}
+
+/*
+ * given a pointer into a directory item, delete it. This
+ * handles items that have more than one entry in them.
+ */
+int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct btrfs_dir_item *di)
+{
+
+ struct extent_buffer *leaf;
+ u32 sub_item_len;
+ u32 item_len;
+ int ret = 0;
+
+ leaf = path->nodes[0];
+ sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) +
+ btrfs_dir_data_len(leaf, di);
+ item_len = btrfs_item_size_nr(leaf, path->slots[0]);
+ if (sub_item_len == item_len) {
+ ret = btrfs_del_item(trans, root, path);
+ } else {
+ unsigned long ptr = (unsigned long)di;
+ unsigned long start;
+
+ start = btrfs_item_ptr_offset(leaf, path->slots[0]);
+ memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
+ item_len - (ptr + sub_item_len - start));
+ btrfs_truncate_item(root, path, item_len - sub_item_len, 1);
+ }
return ret;
}
-int btrfs_match_dir_item_name(struct btrfs_root *root,
- struct btrfs_path *path, char
- *name, int name_len)
+static int verify_dir_item(struct btrfs_root *root,
+ struct extent_buffer *leaf,
+ struct btrfs_dir_item *dir_item)
+{
+ u16 namelen = BTRFS_NAME_LEN;
+ u8 type = btrfs_dir_type(leaf, dir_item);
+
+ if (type >= BTRFS_FT_MAX) {
+ fprintf(stderr, "invalid dir item type: %d\n",
+ (int)type);
+ return 1;
+ }
+
+ if (type == BTRFS_FT_XATTR)
+ namelen = XATTR_NAME_MAX;
+
+ if (btrfs_dir_name_len(leaf, dir_item) > namelen) {
+ fprintf(stderr, "invalid dir item name len: %u\n",
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ /* BTRFS_MAX_XATTR_SIZE is the same for all dir items */
+ if ((btrfs_dir_data_len(leaf, dir_item) +
+ btrfs_dir_name_len(leaf, dir_item)) >
+ BTRFS_MAX_XATTR_SIZE(root->fs_info)) {
+ fprintf(stderr, "invalid dir item name + data len: %u + %u\n",
+ (unsigned)btrfs_dir_name_len(leaf, dir_item),
+ (unsigned)btrfs_dir_data_len(leaf, dir_item));
+ return 1;
+ }
+
+ return 0;
+}
+
+static struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
+ struct btrfs_path *path,
+ const char *name, int name_len)
{
struct btrfs_dir_item *dir_item;
- char *name_ptr;
-
- dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0],
- struct btrfs_dir_item);
- if (btrfs_dir_name_len(dir_item) != name_len)
- return 0;
- name_ptr = (char *)(dir_item + 1);
- if (memcmp(name_ptr, name, name_len))
- return 0;
- return 1;
+ unsigned long name_ptr;
+ u32 total_len;
+ u32 cur = 0;
+ u32 this_len;
+ struct extent_buffer *leaf;
+
+ leaf = path->nodes[0];
+ dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
+ total_len = btrfs_item_size_nr(leaf, path->slots[0]);
+ if (verify_dir_item(root, leaf, dir_item))
+ return NULL;
+
+ while(cur < total_len) {
+ this_len = sizeof(*dir_item) +
+ btrfs_dir_name_len(leaf, dir_item) +
+ btrfs_dir_data_len(leaf, dir_item);
+ if (this_len > (total_len - cur)) {
+ fprintf(stderr, "invalid dir item size\n");
+ return NULL;
+ }
+
+ name_ptr = (unsigned long)(dir_item + 1);
+
+ if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
+ memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
+ return dir_item;
+
+ cur += this_len;
+ dir_item = (struct btrfs_dir_item *)((char *)dir_item +
+ this_len);
+ }
+ return NULL;
}
projects / platform / upstream / btrfs-progs.git / blobdiff