mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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141 lines
4.3 KiB
C
141 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2017-2019 Junjiro R. Okajima
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*
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* This program, aufs is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* renamed dir info
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*/
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#ifndef __AUFS_DIRREN_H__
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#define __AUFS_DIRREN_H__
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#ifdef __KERNEL__
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#include <linux/dcache.h>
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#include <linux/statfs.h>
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#include <linux/uuid.h>
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#include "hbl.h"
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#define AuDirren_NHASH 100
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#ifdef CONFIG_AUFS_DIRREN
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enum au_brid_type {
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AuBrid_Unset,
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AuBrid_UUID,
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AuBrid_FSID,
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AuBrid_DEV
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};
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struct au_dr_brid {
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enum au_brid_type type;
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union {
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uuid_t uuid; /* unimplemented yet */
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fsid_t fsid;
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dev_t dev;
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};
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};
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/* 20 is the max digits length of ulong 64 */
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/* brid-type "_" uuid "_" inum */
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#define AUFS_DIRREN_FNAME_SZ (1 + 1 + UUID_STRING_LEN + 20)
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#define AUFS_DIRREN_ENV_VAL_SZ (AUFS_DIRREN_FNAME_SZ + 1 + 20)
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struct au_dr_hino {
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struct hlist_bl_node dr_hnode;
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ino_t dr_h_ino;
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};
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struct au_dr_br {
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struct hlist_bl_head dr_h_ino[AuDirren_NHASH];
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struct au_dr_brid dr_brid;
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};
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struct au_dr_lookup {
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/* dr_name is pointed by struct au_do_lookup_args.name */
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struct qstr dr_name; /* subset of dr_info */
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aufs_bindex_t ninfo;
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struct au_drinfo **drinfo;
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};
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#else
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struct au_dr_hino;
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/* empty */
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struct au_dr_br { };
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struct au_dr_lookup { };
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#endif
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/* ---------------------------------------------------------------------- */
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struct au_branch;
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struct au_do_lookup_args;
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struct au_hinode;
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#ifdef CONFIG_AUFS_DIRREN
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int au_dr_hino_test_add(struct au_dr_br *dr, ino_t h_ino,
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struct au_dr_hino *add_ent);
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void au_dr_hino_free(struct au_dr_br *dr);
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int au_dr_br_init(struct super_block *sb, struct au_branch *br,
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const struct path *path);
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int au_dr_br_fin(struct super_block *sb, struct au_branch *br);
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int au_dr_rename(struct dentry *src, aufs_bindex_t bindex,
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struct qstr *dst_name, void *_rev);
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void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *rev);
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void au_dr_rename_rev(struct dentry *src, aufs_bindex_t bindex, void *rev);
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int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry,
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aufs_bindex_t bindex);
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int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt);
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int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex,
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ino_t h_ino);
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void au_dr_lkup_fin(struct au_do_lookup_args *lkup);
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int au_dr_opt_set(struct super_block *sb);
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int au_dr_opt_flush(struct super_block *sb);
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int au_dr_opt_clr(struct super_block *sb, int no_flush);
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#else
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AuStubInt0(au_dr_hino_test_add, struct au_dr_br *dr, ino_t h_ino,
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struct au_dr_hino *add_ent);
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AuStubVoid(au_dr_hino_free, struct au_dr_br *dr);
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AuStubInt0(au_dr_br_init, struct super_block *sb, struct au_branch *br,
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const struct path *path);
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AuStubInt0(au_dr_br_fin, struct super_block *sb, struct au_branch *br);
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AuStubInt0(au_dr_rename, struct dentry *src, aufs_bindex_t bindex,
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struct qstr *dst_name, void *_rev);
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AuStubVoid(au_dr_rename_fin, struct dentry *src, aufs_bindex_t btgt, void *rev);
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AuStubVoid(au_dr_rename_rev, struct dentry *src, aufs_bindex_t bindex,
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void *rev);
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AuStubInt0(au_dr_lkup, struct au_do_lookup_args *lkup, struct dentry *dentry,
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aufs_bindex_t bindex);
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AuStubInt0(au_dr_lkup_name, struct au_do_lookup_args *lkup, aufs_bindex_t btgt);
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AuStubInt0(au_dr_lkup_h_ino, struct au_do_lookup_args *lkup,
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aufs_bindex_t bindex, ino_t h_ino);
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AuStubVoid(au_dr_lkup_fin, struct au_do_lookup_args *lkup);
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AuStubInt0(au_dr_opt_set, struct super_block *sb);
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AuStubInt0(au_dr_opt_flush, struct super_block *sb);
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AuStubInt0(au_dr_opt_clr, struct super_block *sb, int no_flush);
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#endif
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/* ---------------------------------------------------------------------- */
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#ifdef CONFIG_AUFS_DIRREN
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static inline int au_dr_ihash(ino_t h_ino)
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{
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return h_ino % AuDirren_NHASH;
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}
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#else
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AuStubInt0(au_dr_ihash, ino_t h_ino);
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#endif
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#endif /* __KERNEL__ */
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#endif /* __AUFS_DIRREN_H__ */
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