1 /* SPDX-License-Identifier: GPL-2.0 */
3 #ifndef BTRFS_INODE_ITEM_H
4 #define BTRFS_INODE_ITEM_H
6 #include <linux/types.h>
7 #include <linux/crc32c.h>
9 struct btrfs_trans_handle;
13 struct btrfs_inode_extref;
19 * Return this if we need to call truncate_block for the last bit of the
22 #define BTRFS_NEED_TRUNCATE_BLOCK 1
24 struct btrfs_truncate_control {
26 * IN: the inode we're operating on, this can be NULL if
27 * ->clear_extent_range is false.
29 struct btrfs_inode *inode;
31 /* IN: the size we're truncating to. */
34 /* OUT: the number of extents truncated. */
37 /* OUT: the last size we truncated this inode to. */
40 /* OUT: the number of bytes to sub from this inode. */
43 /* IN: the ino we are truncating. */
47 * IN: minimum key type to remove. All key types with this type are
48 * removed only if their offset >= new_size.
53 * IN: true if we don't want to do extent reference updates for any file
56 bool skip_ref_updates;
59 * IN: true if we need to clear the file extent range for the inode as
60 * we drop the file extent items.
62 bool clear_extent_range;
66 * btrfs_inode_item stores flags in a u64, btrfs_inode stores them in two
67 * separate u32s. These two functions convert between the two representations.
69 static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags)
71 return (flags | ((u64)ro_flags << 32));
74 static inline void btrfs_inode_split_flags(u64 inode_item_flags,
75 u32 *flags, u32 *ro_flags)
77 *flags = (u32)inode_item_flags;
78 *ro_flags = (u32)(inode_item_flags >> 32);
81 /* Figure the key offset of an extended inode ref. */
82 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len)
84 return (u64)crc32c(parent_objectid, name, len);
87 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
88 struct btrfs_root *root,
89 struct btrfs_truncate_control *control);
90 int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
91 struct btrfs_root *root, const struct fscrypt_str *name,
92 u64 inode_objectid, u64 ref_objectid, u64 index);
93 int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
94 struct btrfs_root *root, const struct fscrypt_str *name,
95 u64 inode_objectid, u64 ref_objectid, u64 *index);
96 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
97 struct btrfs_root *root,
98 struct btrfs_path *path, u64 objectid);
99 int btrfs_lookup_inode(struct btrfs_trans_handle *trans,
100 struct btrfs_root *root, struct btrfs_path *path,
101 struct btrfs_key *location, int mod);
103 struct btrfs_inode_extref *btrfs_lookup_inode_extref(
104 struct btrfs_trans_handle *trans,
105 struct btrfs_root *root,
106 struct btrfs_path *path,
107 const struct fscrypt_str *name,
108 u64 inode_objectid, u64 ref_objectid, int ins_len,
111 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
113 const struct fscrypt_str *name);
114 struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
115 struct extent_buffer *leaf, int slot, u64 ref_objectid,
116 const struct fscrypt_str *name);