1/* SPDX-License-Identifier: GPL-2.0 */
  2
  3#ifndef BTRFS_INODE_ITEM_H
  4#define BTRFS_INODE_ITEM_H
  5
  6#include <linux/types.h>
  7#include <linux/crc32c.h>
  8
  9struct fscrypt_str;
 10struct extent_buffer;
 11struct btrfs_trans_handle;
 12struct btrfs_root;
 13struct btrfs_path;
 14struct btrfs_key;
 15struct btrfs_inode_extref;
 16struct btrfs_inode;
 17struct btrfs_truncate_control;
 18
 19/*
 20 * Return this if we need to call truncate_block for the last bit of the
 21 * truncate.
 22 */
 23#define BTRFS_NEED_TRUNCATE_BLOCK		1
 24
 25struct btrfs_truncate_control {
 26	/*
 27	 * IN: the inode we're operating on, this can be NULL if
 28	 * ->clear_extent_range is false.
 29	 */
 30	struct btrfs_inode *inode;
 31
 32	/* IN: the size we're truncating to. */
 33	u64 new_size;
 34
 35	/* OUT: the number of extents truncated. */
 36	u64 extents_found;
 37
 38	/* OUT: the last size we truncated this inode to. */
 39	u64 last_size;
 40
 41	/* OUT: the number of bytes to sub from this inode. */
 42	u64 sub_bytes;
 43
 44	/* IN: the ino we are truncating. */
 45	u64 ino;
 46
 47	/*
 48	 * IN: minimum key type to remove.  All key types with this type are
 49	 * removed only if their offset >= new_size.
 50	 */
 51	u32 min_type;
 52
 53	/*
 54	 * IN: true if we don't want to do extent reference updates for any file
 55	 * extents we drop.
 56	 */
 57	bool skip_ref_updates;
 58
 59	/*
 60	 * IN: true if we need to clear the file extent range for the inode as
 61	 * we drop the file extent items.
 62	 */
 63	bool clear_extent_range;
 64};
 65
 66/*
 67 * btrfs_inode_item stores flags in a u64, btrfs_inode stores them in two
 68 * separate u32s. These two functions convert between the two representations.
 69 */
 70static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags)
 71{
 72	return (flags | ((u64)ro_flags << 32));
 73}
 74
 75static inline void btrfs_inode_split_flags(u64 inode_item_flags,
 76					   u32 *flags, u32 *ro_flags)
 77{
 78	*flags = (u32)inode_item_flags;
 79	*ro_flags = (u32)(inode_item_flags >> 32);
 80}
 81
 82/* Figure the key offset of an extended inode ref. */
 83static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len)
 84{
 85       return (u64)crc32c(parent_objectid, name, len);
 86}
 87
 88int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
 89			       struct btrfs_root *root,
 90			       struct btrfs_truncate_control *control);
 91int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
 92			   struct btrfs_root *root, const struct fscrypt_str *name,
 93			   u64 inode_objectid, u64 ref_objectid, u64 index);
 94int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
 95			struct btrfs_root *root, const struct fscrypt_str *name,
 96			u64 inode_objectid, u64 ref_objectid, u64 *index);
 97int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
 98			     struct btrfs_root *root,
 99			     struct btrfs_path *path, u64 objectid);
100int btrfs_lookup_inode(struct btrfs_trans_handle *trans,
101		       struct btrfs_root *root, struct btrfs_path *path,
102		       struct btrfs_key *location, int mod);
103
104struct btrfs_inode_extref *btrfs_lookup_inode_extref(
105			  struct btrfs_trans_handle *trans,
106			  struct btrfs_root *root,
107			  struct btrfs_path *path,
108			  const struct fscrypt_str *name,
109			  u64 inode_objectid, u64 ref_objectid, int ins_len,
110			  int cow);
111
112struct btrfs_inode_ref *btrfs_find_name_in_backref(const struct extent_buffer *leaf,
113						   int slot,
114						   const struct fscrypt_str *name);
115struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
116		const struct extent_buffer *leaf, int slot, u64 ref_objectid,
117		const struct fscrypt_str *name);
118
119#endif