/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _BCACHEFS_NAMEI_H
#define _BCACHEFS_NAMEI_H

#include "dirent.h"

struct posix_acl;

/*
 * Does linking this inode into a directory bump that directory's i_nlink?
 *
 * A subvolume root doesn't: it's named by a DT_SUBVOL dirent, and those don't
 * count towards the parent's link count. Anything creating or repairing such a
 * link has to agree with the create path here, or check_nlinks() disagrees with
 * it afterwards.
 */
static inline int is_subdir_for_nlink(struct bch_inode_unpacked *inode)
{
	return S_ISDIR(inode->bi_mode) && !inode->bi_subvol;
}

#define BCH_CREATE_TMPFILE		(1U << 0)
#define BCH_CREATE_SUBVOL		(1U << 1)
#define BCH_CREATE_SNAPSHOT		(1U << 2)
#define BCH_CREATE_SNAPSHOT_RO		(1U << 3)

int bch2_create_trans(struct btree_trans *, subvol_inum,
		      struct bch_inode_unpacked *,
		      struct bch_inode_unpacked *,
		      struct bch_subvolume *,
		      const struct qstr *,
		      uid_t, gid_t, umode_t, dev_t,
		      struct posix_acl *,
		      struct posix_acl *,
		      subvol_inum, unsigned);

int bch2_link_trans(struct btree_trans *,
		    subvol_inum, struct bch_inode_unpacked *,
		    subvol_inum, struct bch_inode_unpacked *,
		    const struct qstr *);

int bch2_unlink_trans(struct btree_trans *,
		      subvol_inum, struct bch_inode_unpacked *,
		      subvol_inum, struct bch_inode_unpacked *,
		      const struct qstr *, bool);

int bch2_rename_trans(struct btree_trans *,
		      subvol_inum, struct bch_inode_unpacked *,
		      subvol_inum, struct bch_inode_unpacked *,
		      struct bch_inode_unpacked *,
		      struct bch_inode_unpacked *,
		      const struct qstr *,
		      const struct qstr *,
		      enum bch_rename_mode);

bool bch2_reinherit_attrs(struct bch_inode_unpacked *,
			  struct bch_inode_unpacked *);

struct bkey_s_c_dirent bch2_inode_get_dirent(struct btree_trans *, struct btree_iter *,
					     struct bch_inode_unpacked *, u32 *);

int bch2_inum_to_path(struct btree_trans *, subvol_inum, struct printbuf *);

#define INUM_TO_PATH_FAIL_ON_ERR	(1 << 0)

int bch2_inum_to_path_in_subvol(struct btree_trans *, subvol_inum,
				u32, unsigned, struct printbuf *);
int bch2_inum_is_descendant(struct btree_trans *, subvol_inum, subvol_inum);
int bch2_inum_snapshot_to_path(struct btree_trans *, u64, u32,
			       snapshot_id_list *, struct printbuf *);

int __bch2_check_dirent_target(struct btree_trans *,
			       struct btree_iter *,
			       struct bkey_s_c_dirent,
			       struct bch_inode_unpacked *, bool);

static inline int dirent_points_to_inode_nowarn(struct bch_fs *c,
						struct bkey_s_c_dirent d,
						struct bch_inode_unpacked *inode)
{
	if (d.v->d_type == DT_SUBVOL
	    ? le32_to_cpu(d.v->d_child_subvol)	== inode->bi_subvol
	    : le64_to_cpu(d.v->d_inum)		== inode->bi_inum)
		return 0;
	return bch_err_throw(c, ENOENT_dirent_doesnt_match_inode);
}

static inline bool inode_points_to_dirent(struct bch_inode_unpacked *inode,
					  struct bkey_s_c_dirent d)
{
	return  inode->bi_dir		== d.k->p.inode &&
		inode->bi_dir_offset	== d.k->p.offset;
}

static inline int bch2_check_dirent_target(struct btree_trans *trans,
					   struct btree_iter *dirent_iter,
					   struct bkey_s_c_dirent d,
					   struct bch_inode_unpacked *target,
					   bool in_fsck)
{
	if (likely(inode_points_to_dirent(target, d) &&
		   d.v->d_type == inode_d_type(target)))
		return 0;

	return __bch2_check_dirent_target(trans, dirent_iter, d, target, in_fsck);
}

int bch2_maybe_propagate_has_case_insensitive(struct btree_trans *, subvol_inum,
					      struct bch_inode_unpacked *);
int bch2_check_inode_has_case_insensitive(struct btree_trans *, struct bch_inode_unpacked *,
					  snapshot_id_list *, bool *);

#endif /* _BCACHEFS_NAMEI_H */
