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