119 lines
3.3 KiB
C
119 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_INODE_ITEM_H
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#define BTRFS_INODE_ITEM_H
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#include <linux/types.h>
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#include <linux/crc32c.h>
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struct btrfs_trans_handle;
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struct btrfs_root;
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struct btrfs_path;
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struct btrfs_key;
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struct btrfs_inode_extref;
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struct btrfs_inode;
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struct extent_buffer;
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struct fscrypt_str;
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/*
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* Return this if we need to call truncate_block for the last bit of the
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* truncate.
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*/
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#define BTRFS_NEED_TRUNCATE_BLOCK 1
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struct btrfs_truncate_control {
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/*
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* IN: the inode we're operating on, this can be NULL if
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* ->clear_extent_range is false.
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*/
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struct btrfs_inode *inode;
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/* IN: the size we're truncating to. */
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u64 new_size;
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/* OUT: the number of extents truncated. */
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u64 extents_found;
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/* OUT: the last size we truncated this inode to. */
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u64 last_size;
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/* OUT: the number of bytes to sub from this inode. */
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u64 sub_bytes;
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/* IN: the ino we are truncating. */
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u64 ino;
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/*
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* IN: minimum key type to remove. All key types with this type are
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* removed only if their offset >= new_size.
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*/
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u32 min_type;
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/*
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* IN: true if we don't want to do extent reference updates for any file
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* extents we drop.
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*/
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bool skip_ref_updates;
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/*
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* IN: true if we need to clear the file extent range for the inode as
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* we drop the file extent items.
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*/
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bool clear_extent_range;
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};
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/*
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* btrfs_inode_item stores flags in a u64, btrfs_inode stores them in two
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* separate u32s. These two functions convert between the two representations.
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*/
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static inline u64 btrfs_inode_combine_flags(u32 flags, u32 ro_flags)
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{
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return (flags | ((u64)ro_flags << 32));
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}
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static inline void btrfs_inode_split_flags(u64 inode_item_flags,
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u32 *flags, u32 *ro_flags)
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{
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*flags = (u32)inode_item_flags;
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*ro_flags = (u32)(inode_item_flags >> 32);
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}
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/* Figure the key offset of an extended inode ref. */
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static inline u64 btrfs_extref_hash(u64 parent_objectid, const char *name, int len)
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{
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return (u64)crc32c(parent_objectid, name, len);
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}
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int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_truncate_control *control);
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int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, const struct fscrypt_str *name,
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u64 inode_objectid, u64 ref_objectid, u64 index);
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int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, const struct fscrypt_str *name,
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u64 inode_objectid, u64 ref_objectid, u64 *index);
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int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid);
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int btrfs_lookup_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct btrfs_path *path,
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struct btrfs_key *location, int mod);
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struct btrfs_inode_extref *btrfs_lookup_inode_extref(
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struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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const struct fscrypt_str *name,
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u64 inode_objectid, u64 ref_objectid, int ins_len,
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int cow);
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struct btrfs_inode_ref *btrfs_find_name_in_backref(struct extent_buffer *leaf,
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int slot,
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const struct fscrypt_str *name);
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struct btrfs_inode_extref *btrfs_find_name_in_ext_backref(
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struct extent_buffer *leaf, int slot, u64 ref_objectid,
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const struct fscrypt_str *name);
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#endif
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