mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 00:10:51 +07:00
138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2005-2019 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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* sub-routines for dentry cache
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*/
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#ifndef __AUFS_DCSUB_H__
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#define __AUFS_DCSUB_H__
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#ifdef __KERNEL__
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#include <linux/dcache.h>
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#include <linux/fs.h>
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struct au_dpage {
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int ndentry;
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struct dentry **dentries;
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};
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struct au_dcsub_pages {
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int ndpage;
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struct au_dpage *dpages;
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};
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/* ---------------------------------------------------------------------- */
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/* dcsub.c */
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int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
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void au_dpages_free(struct au_dcsub_pages *dpages);
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typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
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int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
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au_dpages_test test, void *arg);
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int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
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int do_include, au_dpages_test test, void *arg);
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int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
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struct dentry *dentry, int do_include);
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int au_test_subdir(struct dentry *d1, struct dentry *d2);
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/* ---------------------------------------------------------------------- */
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/*
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* todo: in linux-3.13, several similar (but faster) helpers are added to
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* include/linux/dcache.h. Try them (in the future).
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*/
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static inline int au_d_hashed_positive(struct dentry *d)
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{
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int err;
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struct inode *inode = d_inode(d);
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err = 0;
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if (unlikely(d_unhashed(d)
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|| d_is_negative(d)
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|| !inode->i_nlink))
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err = -ENOENT;
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return err;
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}
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static inline int au_d_linkable(struct dentry *d)
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{
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int err;
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struct inode *inode = d_inode(d);
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err = au_d_hashed_positive(d);
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if (err
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&& d_is_positive(d)
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&& (inode->i_state & I_LINKABLE))
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err = 0;
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return err;
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}
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static inline int au_d_alive(struct dentry *d)
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{
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int err;
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struct inode *inode;
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err = 0;
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if (!IS_ROOT(d))
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err = au_d_hashed_positive(d);
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else {
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inode = d_inode(d);
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if (unlikely(d_unlinked(d)
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|| d_is_negative(d)
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|| !inode->i_nlink))
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err = -ENOENT;
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}
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return err;
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}
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static inline int au_alive_dir(struct dentry *d)
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{
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int err;
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err = au_d_alive(d);
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if (unlikely(err || IS_DEADDIR(d_inode(d))))
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err = -ENOENT;
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return err;
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}
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static inline int au_qstreq(struct qstr *a, struct qstr *b)
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{
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return a->len == b->len
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&& !memcmp(a->name, b->name, a->len);
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}
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/*
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* by the commit
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* 360f547 2015-01-25 dcache: let the dentry count go down to zero without
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* taking d_lock
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* the type of d_lockref.count became int, but the inlined function d_count()
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* still returns unsigned int.
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* I don't know why. Maybe it is for every d_count() users?
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* Anyway au_dcount() lives on.
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*/
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static inline int au_dcount(struct dentry *d)
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{
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return (int)d_count(d);
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}
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#endif /* __KERNEL__ */
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#endif /* __AUFS_DCSUB_H__ */
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