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 fscrypt_str; 10 struct extent_buffer; 11 struct btrfs_trans_handle; 12 struct btrfs_root; 13 struct btrfs_path; 14 struct btrfs_key; 15 struct btrfs_inode_extref; 16 struct btrfs_inode; 17 struct 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 25 struct 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 */ btrfs_inode_combine_flags(u32 flags,u32 ro_flags)70 static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags) 71 { 72 return (flags | ((u64)ro_flags << 32)); 73 } 74 btrfs_inode_split_flags(u64 inode_item_flags,u32 * flags,u32 * ro_flags)75 static 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. */ btrfs_extref_hash(u64 parent_objectid,const char * name,int len)83 static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len) 84 { 85 return (u64)crc32c(parent_objectid, name, len); 86 } 87 88 int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans, 89 struct btrfs_root *root, 90 struct btrfs_truncate_control *control); 91 int 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); 94 int 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); 97 int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans, 98 struct btrfs_root *root, 99 struct btrfs_path *path, u64 objectid); 100 int btrfs_lookup_inode(struct btrfs_trans_handle *trans, 101 struct btrfs_root *root, struct btrfs_path *path, 102 struct btrfs_key *location, int mod); 103 104 struct 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); 111 112 struct btrfs_inode_ref *btrfs_find_name_in_backref(const struct extent_buffer *leaf, 113 int slot, 114 const struct fscrypt_str *name); 115 struct 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 120