ab2a29ccff
This patch adds two new inode fields, bi_dir and bi_dir_offset, that point back to the inode's dirent. Since we're only adding fields for a single backpointer, files that have been hardlinked won't necessarily have valid backpointers: we also add a new inode flag, BCH_INODE_BACKPTR_UNTRUSTED, that's set if an inode has ever had multiple links to it. That's ok, because we only really need this functionality for directories, which can never have multiple hardlinks - when we add subvolumes, we'll need a way to enemurate and print subvolumes, and this will let us reconstruct a path to a subvolume root given a subvolume root inode. Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _BCACHEFS_DIRENT_H
|
|
#define _BCACHEFS_DIRENT_H
|
|
|
|
#include "str_hash.h"
|
|
|
|
extern const struct bch_hash_desc bch2_dirent_hash_desc;
|
|
|
|
const char *bch2_dirent_invalid(const struct bch_fs *, struct bkey_s_c);
|
|
void bch2_dirent_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
|
|
|
|
#define bch2_bkey_ops_dirent (struct bkey_ops) { \
|
|
.key_invalid = bch2_dirent_invalid, \
|
|
.val_to_text = bch2_dirent_to_text, \
|
|
}
|
|
|
|
struct qstr;
|
|
struct file;
|
|
struct dir_context;
|
|
struct bch_fs;
|
|
struct bch_hash_info;
|
|
struct bch_inode_info;
|
|
|
|
unsigned bch2_dirent_name_bytes(struct bkey_s_c_dirent);
|
|
|
|
static inline unsigned dirent_val_u64s(unsigned len)
|
|
{
|
|
return DIV_ROUND_UP(offsetof(struct bch_dirent, d_name) + len,
|
|
sizeof(u64));
|
|
}
|
|
|
|
int bch2_dirent_create(struct btree_trans *, u64,
|
|
const struct bch_hash_info *, u8,
|
|
const struct qstr *, u64, u64 *, int);
|
|
|
|
int bch2_dirent_delete_at(struct btree_trans *,
|
|
const struct bch_hash_info *,
|
|
struct btree_iter *);
|
|
|
|
enum bch_rename_mode {
|
|
BCH_RENAME,
|
|
BCH_RENAME_OVERWRITE,
|
|
BCH_RENAME_EXCHANGE,
|
|
};
|
|
|
|
int bch2_dirent_rename(struct btree_trans *,
|
|
u64, struct bch_hash_info *,
|
|
u64, struct bch_hash_info *,
|
|
const struct qstr *, u64 *, u64 *,
|
|
const struct qstr *, u64 *, u64 *,
|
|
enum bch_rename_mode);
|
|
|
|
struct btree_iter *
|
|
__bch2_dirent_lookup_trans(struct btree_trans *, u64,
|
|
const struct bch_hash_info *,
|
|
const struct qstr *, unsigned);
|
|
u64 bch2_dirent_lookup(struct bch_fs *, u64, const struct bch_hash_info *,
|
|
const struct qstr *);
|
|
|
|
int bch2_empty_dir_trans(struct btree_trans *, u64);
|
|
int bch2_readdir(struct bch_fs *, u64, struct dir_context *);
|
|
|
|
#endif /* _BCACHEFS_DIRENT_H */
|