/usr/src/aufs-4.9+20161219/fs/aufs/dcsub.h is in aufs-dkms 4.9+20161219-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 | /*
* Copyright (C) 2005-2016 Junjiro R. Okajima
*
* This program, aufs is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* sub-routines for dentry cache
*/
#ifndef __AUFS_DCSUB_H__
#define __AUFS_DCSUB_H__
#ifdef __KERNEL__
#include <linux/dcache.h>
#include <linux/fs.h>
struct au_dpage {
int ndentry;
struct dentry **dentries;
};
struct au_dcsub_pages {
int ndpage;
struct au_dpage *dpages;
};
/* ---------------------------------------------------------------------- */
/* dcsub.c */
int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp);
void au_dpages_free(struct au_dcsub_pages *dpages);
typedef int (*au_dpages_test)(struct dentry *dentry, void *arg);
int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root,
au_dpages_test test, void *arg);
int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry,
int do_include, au_dpages_test test, void *arg);
int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages,
struct dentry *dentry, int do_include);
int au_test_subdir(struct dentry *d1, struct dentry *d2);
/* ---------------------------------------------------------------------- */
/*
* todo: in linux-3.13, several similar (but faster) helpers are added to
* include/linux/dcache.h. Try them (in the future).
*/
static inline int au_d_hashed_positive(struct dentry *d)
{
int err;
struct inode *inode = d_inode(d);
err = 0;
if (unlikely(d_unhashed(d)
|| d_is_negative(d)
|| !inode->i_nlink))
err = -ENOENT;
return err;
}
static inline int au_d_linkable(struct dentry *d)
{
int err;
struct inode *inode = d_inode(d);
err = au_d_hashed_positive(d);
if (err
&& d_is_positive(d)
&& (inode->i_state & I_LINKABLE))
err = 0;
return err;
}
static inline int au_d_alive(struct dentry *d)
{
int err;
struct inode *inode;
err = 0;
if (!IS_ROOT(d))
err = au_d_hashed_positive(d);
else {
inode = d_inode(d);
if (unlikely(d_unlinked(d)
|| d_is_negative(d)
|| !inode->i_nlink))
err = -ENOENT;
}
return err;
}
static inline int au_alive_dir(struct dentry *d)
{
int err;
err = au_d_alive(d);
if (unlikely(err || IS_DEADDIR(d_inode(d))))
err = -ENOENT;
return err;
}
static inline int au_qstreq(struct qstr *a, struct qstr *b)
{
return a->len == b->len
&& !memcmp(a->name, b->name, a->len);
}
/*
* by the commit
* 360f547 2015-01-25 dcache: let the dentry count go down to zero without
* taking d_lock
* the type of d_lockref.count became int, but the inlined function d_count()
* still returns unsigned int.
* I don't know why. Maybe it is for every d_count() users?
* Anyway au_dcount() lives on.
*/
static inline int au_dcount(struct dentry *d)
{
return (int)d_count(d);
}
#endif /* __KERNEL__ */
#endif /* __AUFS_DCSUB_H__ */
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