forked from luck/tmp_suning_uos_patched
Btrfs: Add back pointers from the inode to the directory that references it
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
parent
d8d5f3e16d
commit
3954401fa6
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@ -53,7 +53,7 @@ extern struct kmem_cache *btrfs_path_cachep;
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#define BTRFS_CSUM_SIZE 32
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/* four bytes for CRC32 */
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#define BTRFS_CRC32_SIZE 4
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#define BTRFS_EMPTY_DIR_SIZE 6
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#define BTRFS_EMPTY_DIR_SIZE 0
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#define BTRFS_FT_UNKNOWN 0
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#define BTRFS_FT_REG_FILE 1
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@ -206,6 +206,11 @@ struct btrfs_extent_ref {
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__le64 offset;
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} __attribute__ ((__packed__));
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struct btrfs_inode_ref {
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__le16 name_len;
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/* name goes here */
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} __attribute__ ((__packed__));
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struct btrfs_inode_timespec {
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__le64 sec;
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__le32 nsec;
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@ -379,7 +384,8 @@ struct btrfs_root {
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* the FS
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*/
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#define BTRFS_INODE_ITEM_KEY 1
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#define BTRFS_XATTR_ITEM_KEY 2
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#define BTRFS_INODE_REF_KEY 2
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#define BTRFS_XATTR_ITEM_KEY 8
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/* reserve 2-15 close to the inode for later flexibility */
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/*
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@ -486,6 +492,9 @@ BTRFS_SETGET_STACK_FUNCS(block_group_used, struct btrfs_block_group_item,
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BTRFS_SETGET_FUNCS(disk_block_group_used, struct btrfs_block_group_item,
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used, 64);
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/* struct btrfs_inode_ref */
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BTRFS_SETGET_FUNCS(inode_ref_name_len, struct btrfs_inode_ref, name_len, 16);
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/* struct btrfs_inode_item */
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BTRFS_SETGET_FUNCS(inode_generation, struct btrfs_inode_item, generation, 64);
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BTRFS_SETGET_FUNCS(inode_size, struct btrfs_inode_item, size, 64);
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@ -1043,6 +1052,14 @@ int btrfs_find_free_objectid(struct btrfs_trans_handle *trans,
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int btrfs_find_highest_inode(struct btrfs_root *fs_root, u64 *objectid);
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/* inode-item.c */
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int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid);
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int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid);
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int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid);
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@ -20,6 +20,142 @@
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#include "disk-io.h"
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#include "transaction.h"
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int find_name_in_backref(struct btrfs_path *path, const char * name,
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int name_len, struct btrfs_inode_ref **ref_ret)
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{
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struct extent_buffer *leaf;
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struct btrfs_inode_ref *ref;
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unsigned long ptr;
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unsigned long name_ptr;
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u32 item_size;
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u32 cur_offset = 0;
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int len;
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leaf = path->nodes[0];
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item_size = btrfs_item_size_nr(leaf, path->slots[0]);
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ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
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while (cur_offset < item_size) {
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ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
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len = btrfs_inode_ref_name_len(leaf, ref);
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name_ptr = (unsigned long)(ref + 1);
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cur_offset += len + sizeof(*ref);
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if (len != name_len)
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continue;
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if (memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) {
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*ref_ret = ref;
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return 1;
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}
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}
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return 0;
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}
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int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_inode_ref *ref;
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struct extent_buffer *leaf;
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unsigned long ptr;
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unsigned long item_start;
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u32 item_size;
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u32 sub_item_len;
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int ret;
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int del_len = name_len + sizeof(*ref);
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key.objectid = inode_objectid;
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key.offset = ref_objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret > 0) {
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ret = -ENOENT;
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goto out;
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} else if (ret < 0) {
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goto out;
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}
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if (!find_name_in_backref(path, name, name_len, &ref)) {
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ret = -ENOENT;
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goto out;
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}
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leaf = path->nodes[0];
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item_size = btrfs_item_size_nr(leaf, path->slots[0]);
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if (del_len == item_size) {
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ret = btrfs_del_item(trans, root, path);
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goto out;
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}
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ptr = (unsigned long)ref;
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sub_item_len = name_len + sizeof(*ref);
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item_start = btrfs_item_ptr_offset(leaf, path->slots[0]);
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memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
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item_size - (ptr + sub_item_len - item_start));
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ret = btrfs_truncate_item(trans, root, path,
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item_size - sub_item_len, 1);
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BUG_ON(ret);
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out:
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btrfs_free_path(path);
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return ret;
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}
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int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_inode_ref *ref;
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unsigned long ptr;
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int ret;
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int ins_len = name_len + sizeof(*ref);
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key.objectid = inode_objectid;
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key.offset = ref_objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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ins_len);
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if (ret == -EEXIST) {
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u32 old_size;
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if (find_name_in_backref(path, name, name_len, &ref))
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goto out;
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old_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]);
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ret = btrfs_extend_item(trans, root, path, ins_len);
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BUG_ON(ret);
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ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_ref);
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ref = (struct btrfs_inode_ref *)((unsigned long)ref + old_size);
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btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
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ptr = (unsigned long)(ref + 1);
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ret = 0;
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} else if (ret < 0) {
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goto out;
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} else {
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ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_ref);
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btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
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ptr = (unsigned long)(ref + 1);
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}
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write_extent_buffer(path->nodes[0], name, ptr, name_len);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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out:
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btrfs_free_path(path);
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return ret;
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}
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int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid)
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258
fs/btrfs/inode.c
258
fs/btrfs/inode.c
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@ -404,6 +404,17 @@ static int btrfs_unlink_trans(struct btrfs_trans_handle *trans,
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ret = btrfs_delete_one_dir_name(trans, root, path, di);
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dentry->d_inode->i_ctime = dir->i_ctime;
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if (!S_ISLNK(dentry->d_inode->i_mode)) {
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ret = btrfs_del_inode_ref(trans, root, name, name_len,
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dentry->d_inode->i_ino,
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dentry->d_parent->d_inode->i_ino);
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if (ret) {
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printk("failed to delete reference to %.*s, "
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"inode %lu parent %lu\n", name_len, name,
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dentry->d_inode->i_ino,
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dentry->d_parent->d_inode->i_ino);
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}
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}
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err:
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btrfs_free_path(path);
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if (!ret) {
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@ -445,75 +456,27 @@ static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
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int err;
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int ret;
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struct btrfs_root *root = BTRFS_I(dir)->root;
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_trans_handle *trans;
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struct btrfs_key found_key;
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int found_type;
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struct extent_buffer *leaf;
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char *goodnames = "..";
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unsigned long nr;
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if (inode->i_size > BTRFS_EMPTY_DIR_SIZE)
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return -ENOTEMPTY;
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path = btrfs_alloc_path();
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BUG_ON(!path);
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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btrfs_set_trans_block_group(trans, dir);
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key.objectid = inode->i_ino;
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key.offset = (u64)-1;
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key.type = (u8)-1;
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while(1) {
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret < 0) {
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err = ret;
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goto out;
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}
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BUG_ON(ret == 0);
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if (path->slots[0] == 0) {
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err = -ENOENT;
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goto out;
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}
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path->slots[0]--;
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
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found_type = btrfs_key_type(&found_key);
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if (found_key.objectid != inode->i_ino) {
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err = -ENOENT;
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goto out;
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}
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if ((found_type != BTRFS_DIR_ITEM_KEY &&
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found_type != BTRFS_DIR_INDEX_KEY) ||
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(!btrfs_match_dir_item_name(root, path, goodnames, 2) &&
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!btrfs_match_dir_item_name(root, path, goodnames, 1))) {
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err = -ENOTEMPTY;
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goto out;
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}
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ret = btrfs_del_item(trans, root, path);
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BUG_ON(ret);
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if (found_type == BTRFS_DIR_ITEM_KEY && found_key.offset == 1)
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break;
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btrfs_release_path(root, path);
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}
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ret = 0;
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btrfs_release_path(root, path);
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/* now the directory is empty */
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err = btrfs_unlink_trans(trans, root, dir, dentry);
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if (!err) {
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inode->i_size = 0;
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}
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out:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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nr = trans->blocks_used;
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ret = btrfs_end_transaction(trans, root);
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mutex_unlock(&root->fs_info->fs_mutex);
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btrfs_btree_balance_dirty(root, nr);
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if (ret && !err)
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err = ret;
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return err;
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@ -887,21 +850,59 @@ static int btrfs_inode_by_name(struct inode *dir, struct dentry *dentry,
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struct btrfs_root *root = BTRFS_I(dir)->root;
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int ret = 0;
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if (namelen == 1 && strcmp(name, ".") == 0) {
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location->objectid = dir->i_ino;
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location->type = BTRFS_INODE_ITEM_KEY;
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location->offset = 0;
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return 0;
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}
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path = btrfs_alloc_path();
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BUG_ON(!path);
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if (namelen == 1 && strcmp(name, "..") == 0) {
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struct btrfs_key key;
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struct extent_buffer *leaf;
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u32 nritems;
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int slot;
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key.objectid = dir->i_ino;
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btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
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key.offset = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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BUG_ON(ret == 0);
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ret = 0;
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leaf = path->nodes[0];
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slot = path->slots[0];
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nritems = btrfs_header_nritems(leaf);
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if (slot >= nritems)
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goto out_err;
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btrfs_item_key_to_cpu(leaf, &key, slot);
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if (key.objectid != dir->i_ino ||
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key.type != BTRFS_INODE_REF_KEY) {
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goto out_err;
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}
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location->objectid = key.offset;
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location->type = BTRFS_INODE_ITEM_KEY;
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location->offset = 0;
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goto out;
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}
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di = btrfs_lookup_dir_item(NULL, root, path, dir->i_ino, name,
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namelen, 0);
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if (IS_ERR(di))
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ret = PTR_ERR(di);
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if (!di || IS_ERR(di)) {
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location->objectid = 0;
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goto out;
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goto out_err;
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}
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btrfs_dir_item_key_to_cpu(path->nodes[0], di, location);
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out:
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btrfs_release_path(root, path);
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btrfs_free_path(path);
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return ret;
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out_err:
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location->objectid = 0;
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goto out;
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}
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/*
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@ -1053,13 +1054,50 @@ static int btrfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
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if (root->fs_info->tree_root == root)
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key_type = BTRFS_DIR_ITEM_KEY;
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/* special case for "." */
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if (filp->f_pos == 0) {
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over = filldir(dirent, ".", 1,
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1, inode->i_ino,
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DT_DIR);
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if (over)
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return 0;
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filp->f_pos = 1;
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}
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mutex_lock(&root->fs_info->fs_mutex);
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key.objectid = inode->i_ino;
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path = btrfs_alloc_path();
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path->reada = 2;
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/* special case for .., just use the back ref */
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if (filp->f_pos == 1) {
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btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
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key.offset = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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BUG_ON(ret == 0);
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leaf = path->nodes[0];
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slot = path->slots[0];
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nritems = btrfs_header_nritems(leaf);
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if (slot >= nritems) {
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btrfs_release_path(root, path);
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goto read_dir_items;
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}
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btrfs_item_key_to_cpu(leaf, &found_key, slot);
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btrfs_release_path(root, path);
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if (found_key.objectid != key.objectid ||
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found_key.type != BTRFS_INODE_REF_KEY)
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goto read_dir_items;
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over = filldir(dirent, "..", 2,
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2, found_key.offset, DT_DIR);
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if (over)
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goto nopos;
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filp->f_pos = 2;
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}
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read_dir_items:
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btrfs_set_key_type(&key, key_type);
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key.offset = filp->f_pos;
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path = btrfs_alloc_path();
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path->reada = 2;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto err;
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@ -1255,6 +1293,13 @@ static int btrfs_add_link(struct btrfs_trans_handle *trans,
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dentry->d_parent->d_inode->i_ino,
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&key, btrfs_inode_type(inode));
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if (ret == 0) {
|
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if (!S_ISLNK(inode->i_mode)) {
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ret = btrfs_insert_inode_ref(trans, root,
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dentry->d_name.name,
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dentry->d_name.len,
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inode->i_ino,
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dentry->d_parent->d_inode->i_ino);
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}
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parent_inode = dentry->d_parent->d_inode;
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parent_inode->i_size += dentry->d_name.len * 2;
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parent_inode->i_mtime = parent_inode->i_ctime = CURRENT_TIME;
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@ -1430,35 +1475,6 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
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return err;
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}
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|
||||
static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
|
||||
struct btrfs_root *root,
|
||||
u64 objectid, u64 dirid)
|
||||
{
|
||||
int ret;
|
||||
char buf[2];
|
||||
struct btrfs_key key;
|
||||
|
||||
buf[0] = '.';
|
||||
buf[1] = '.';
|
||||
|
||||
key.objectid = objectid;
|
||||
key.offset = 0;
|
||||
btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
|
||||
|
||||
ret = btrfs_insert_dir_item(trans, root, buf, 1, objectid,
|
||||
&key, BTRFS_FT_DIR);
|
||||
if (ret)
|
||||
goto error;
|
||||
|
||||
key.objectid = dirid;
|
||||
ret = btrfs_insert_dir_item(trans, root, buf, 2, objectid,
|
||||
&key, BTRFS_FT_DIR);
|
||||
if (ret)
|
||||
goto error;
|
||||
error:
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
||||
{
|
||||
struct inode *inode;
|
||||
|
|
@ -1496,11 +1512,7 @@ static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
|
|||
inode->i_fop = &btrfs_dir_file_operations;
|
||||
btrfs_set_trans_block_group(trans, inode);
|
||||
|
||||
err = btrfs_make_empty_dir(trans, root, inode->i_ino, dir->i_ino);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
||||
inode->i_size = 6;
|
||||
inode->i_size = 0;
|
||||
err = btrfs_update_inode(trans, root, inode);
|
||||
if (err)
|
||||
goto out_fail;
|
||||
|
|
@ -1971,6 +1983,12 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
|
|||
if (ret)
|
||||
goto fail;
|
||||
|
||||
ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
|
||||
name, namelen, objectid,
|
||||
root->fs_info->sb->s_root->d_inode->i_ino);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
ret = btrfs_commit_transaction(trans, root);
|
||||
if (ret)
|
||||
goto fail_commit;
|
||||
|
|
@ -1989,12 +2007,10 @@ static int create_subvol(struct btrfs_root *root, char *name, int namelen)
|
|||
inode->i_fop = &btrfs_dir_file_operations;
|
||||
new_root->inode = inode;
|
||||
|
||||
ret = btrfs_make_empty_dir(trans, new_root, new_dirid, new_dirid);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
ret = btrfs_insert_inode_ref(trans, new_root, "..", 2, new_dirid,
|
||||
new_dirid);
|
||||
inode->i_nlink = 1;
|
||||
inode->i_size = 6;
|
||||
inode->i_size = 0;
|
||||
ret = btrfs_update_inode(trans, new_root, inode);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
|
@ -2068,6 +2084,13 @@ static int create_snapshot(struct btrfs_root *root, char *name, int namelen)
|
|||
if (ret)
|
||||
goto fail;
|
||||
|
||||
ret = btrfs_insert_inode_ref(trans, root->fs_info->tree_root,
|
||||
name, namelen, objectid,
|
||||
root->fs_info->sb->s_root->d_inode->i_ino);
|
||||
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
||||
ret = btrfs_inc_root_ref(trans, root, objectid);
|
||||
if (ret)
|
||||
goto fail;
|
||||
|
|
@ -2338,7 +2361,6 @@ static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
|
|||
struct inode *old_inode = old_dentry->d_inode;
|
||||
struct timespec ctime = CURRENT_TIME;
|
||||
struct btrfs_path *path;
|
||||
struct btrfs_dir_item *di;
|
||||
int ret;
|
||||
|
||||
if (S_ISDIR(old_inode->i_mode) && new_inode &&
|
||||
|
|
@ -2361,52 +2383,6 @@ static int btrfs_rename(struct inode * old_dir, struct dentry *old_dentry,
|
|||
new_dir->i_ctime = new_dir->i_mtime = ctime;
|
||||
old_inode->i_ctime = ctime;
|
||||
|
||||
if (S_ISDIR(old_inode->i_mode) && old_dir != new_dir) {
|
||||
struct btrfs_key *location = &BTRFS_I(new_dir)->location;
|
||||
struct btrfs_key old_parent_key;
|
||||
di = btrfs_lookup_dir_item(trans, root, path, old_inode->i_ino,
|
||||
"..", 2, -1);
|
||||
if (IS_ERR(di)) {
|
||||
ret = PTR_ERR(di);
|
||||
goto out_fail;
|
||||
}
|
||||
if (!di) {
|
||||
ret = -ENOENT;
|
||||
goto out_fail;
|
||||
}
|
||||
btrfs_dir_item_key_to_cpu(path->nodes[0], di, &old_parent_key);
|
||||
ret = btrfs_del_item(trans, root, path);
|
||||
if (ret) {
|
||||
goto out_fail;
|
||||
}
|
||||
btrfs_release_path(root, path);
|
||||
|
||||
di = btrfs_lookup_dir_index_item(trans, root, path,
|
||||
old_inode->i_ino,
|
||||
old_parent_key.objectid,
|
||||
"..", 2, -1);
|
||||
if (IS_ERR(di)) {
|
||||
ret = PTR_ERR(di);
|
||||
goto out_fail;
|
||||
}
|
||||
if (!di) {
|
||||
ret = -ENOENT;
|
||||
goto out_fail;
|
||||
}
|
||||
ret = btrfs_del_item(trans, root, path);
|
||||
if (ret) {
|
||||
goto out_fail;
|
||||
}
|
||||
btrfs_release_path(root, path);
|
||||
|
||||
ret = btrfs_insert_dir_item(trans, root, "..", 2,
|
||||
old_inode->i_ino, location,
|
||||
BTRFS_FT_DIR);
|
||||
if (ret)
|
||||
goto out_fail;
|
||||
}
|
||||
|
||||
|
||||
ret = btrfs_unlink_trans(trans, root, old_dir, old_dentry);
|
||||
if (ret)
|
||||
goto out_fail;
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user