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1/* SPDX-License-Identifier: GPL-2.0 */2 3#ifndef BTRFS_INODE_ITEM_H4#define BTRFS_INODE_ITEM_H5 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 the21 * truncate.22 */23#define BTRFS_NEED_TRUNCATE_BLOCK 124 25struct btrfs_truncate_control {26 /*27 * IN: the inode we're operating on, this can be NULL if28 * ->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 are49 * 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 file55 * 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 as61 * 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 two68 * 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#endif120