ca283ea992
Continue adding const to parameters. This is for clarity and minor addition to safety. There are some minor effects, in the assembly code and .ko measured on release config. Signed-off-by: David Sterba <dsterba@suse.com>
120 lines
3.3 KiB
C
120 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 fscrypt_str;
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struct extent_buffer;
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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 btrfs_truncate_control;
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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(const 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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const 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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