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 9 struct btrfs_trans_handle; 10 struct btrfs_root; 11 struct btrfs_path; 12 struct btrfs_key; 13 struct btrfs_inode_extref; 14 struct btrfs_inode; 15 struct extent_buffer; 16 struct 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 24 struct 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 */ 69 static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags) 70 { 71 return (flags | ((u64)ro_flags << 32)); 72 } 73 74 static 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. */ 82 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len) 83 { 84 return (u64)crc32c(parent_objectid, name, len); 85 } 86 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); 102 103 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, 109 int cow); 110 111 struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf, 112 int slot, 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); 117 118 #endif 119