/usr/src/aufs-4.9+20161219/fs/aufs/file.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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 | /*
* 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/>.
*/
/*
* file operations
*/
#ifndef __AUFS_FILE_H__
#define __AUFS_FILE_H__
#ifdef __KERNEL__
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include "rwsem.h"
struct au_branch;
struct au_hfile {
struct file *hf_file;
struct au_branch *hf_br;
};
struct au_vdir;
struct au_fidir {
aufs_bindex_t fd_bbot;
aufs_bindex_t fd_nent;
struct au_vdir *fd_vdir_cache;
struct au_hfile fd_hfile[];
};
static inline int au_fidir_sz(int nent)
{
AuDebugOn(nent < 0);
return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent;
}
struct au_finfo {
atomic_t fi_generation;
struct au_rwsem fi_rwsem;
aufs_bindex_t fi_btop;
/* do not union them */
struct { /* for non-dir */
struct au_hfile fi_htop;
atomic_t fi_mmapped;
};
struct au_fidir *fi_hdir; /* for dir only */
struct hlist_node fi_hlist;
union {
struct file *fi_file; /* very ugly */
struct llist_node fi_lnode; /* delayed free */
};
} ____cacheline_aligned_in_smp;
/* ---------------------------------------------------------------------- */
/* file.c */
extern const struct address_space_operations aufs_aop;
unsigned int au_file_roflags(unsigned int flags);
struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags,
struct file *file, int force_wr);
struct au_do_open_args {
int no_lock;
int (*open)(struct file *file, int flags,
struct file *h_file);
struct au_fidir *fidir;
struct file *h_file;
};
int au_do_open(struct file *file, struct au_do_open_args *args);
int au_reopen_nondir(struct file *file);
struct au_pin;
int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin);
int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file),
int wlock);
int au_do_flush(struct file *file, fl_owner_t id,
int (*flush)(struct file *file, fl_owner_t id));
/* poll.c */
#ifdef CONFIG_AUFS_POLL
unsigned int aufs_poll(struct file *file, poll_table *wait);
#endif
#ifdef CONFIG_AUFS_BR_HFSPLUS
/* hfsplus.c */
struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex,
int force_wr);
void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex,
struct file *h_file);
#else
AuStub(struct file *, au_h_open_pre, return NULL, struct dentry *dentry,
aufs_bindex_t bindex, int force_wr)
AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex,
struct file *h_file);
#endif
/* f_op.c */
extern const struct file_operations aufs_file_fop;
int au_do_open_nondir(struct file *file, int flags, struct file *h_file);
int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file);
struct file *au_read_pre(struct file *file, int keep_fi);
/* finfo.c */
void au_hfput(struct au_hfile *hf, int execed);
void au_set_h_fptr(struct file *file, aufs_bindex_t bindex,
struct file *h_file);
void au_update_figen(struct file *file);
struct au_fidir *au_fidir_alloc(struct super_block *sb);
int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink);
void au_fi_init_once(void *_fi);
void au_finfo_fin(struct file *file, int atonce);
int au_finfo_init(struct file *file, struct au_fidir *fidir);
/* ioctl.c */
long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg);
#ifdef CONFIG_COMPAT
long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd,
unsigned long arg);
long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd,
unsigned long arg);
#endif
/* ---------------------------------------------------------------------- */
static inline struct au_finfo *au_fi(struct file *file)
{
return file->private_data;
}
/* ---------------------------------------------------------------------- */
/*
* fi_read_lock, fi_write_lock,
* fi_read_unlock, fi_write_unlock, fi_downgrade_lock
*/
AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem);
#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem)
#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem)
#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem)
/* ---------------------------------------------------------------------- */
/* todo: hard/soft set? */
static inline aufs_bindex_t au_fbtop(struct file *file)
{
FiMustAnyLock(file);
return au_fi(file)->fi_btop;
}
static inline aufs_bindex_t au_fbbot_dir(struct file *file)
{
FiMustAnyLock(file);
AuDebugOn(!au_fi(file)->fi_hdir);
return au_fi(file)->fi_hdir->fd_bbot;
}
static inline struct au_vdir *au_fvdir_cache(struct file *file)
{
FiMustAnyLock(file);
AuDebugOn(!au_fi(file)->fi_hdir);
return au_fi(file)->fi_hdir->fd_vdir_cache;
}
static inline void au_set_fbtop(struct file *file, aufs_bindex_t bindex)
{
FiMustWriteLock(file);
au_fi(file)->fi_btop = bindex;
}
static inline void au_set_fbbot_dir(struct file *file, aufs_bindex_t bindex)
{
FiMustWriteLock(file);
AuDebugOn(!au_fi(file)->fi_hdir);
au_fi(file)->fi_hdir->fd_bbot = bindex;
}
static inline void au_set_fvdir_cache(struct file *file,
struct au_vdir *vdir_cache)
{
FiMustWriteLock(file);
AuDebugOn(!au_fi(file)->fi_hdir);
au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache;
}
static inline struct file *au_hf_top(struct file *file)
{
FiMustAnyLock(file);
AuDebugOn(au_fi(file)->fi_hdir);
return au_fi(file)->fi_htop.hf_file;
}
static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex)
{
FiMustAnyLock(file);
AuDebugOn(!au_fi(file)->fi_hdir);
return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file;
}
/* todo: memory barrier? */
static inline unsigned int au_figen(struct file *f)
{
return atomic_read(&au_fi(f)->fi_generation);
}
static inline void au_set_mmapped(struct file *f)
{
if (atomic_inc_return(&au_fi(f)->fi_mmapped))
return;
pr_warn("fi_mmapped wrapped around\n");
while (!atomic_inc_return(&au_fi(f)->fi_mmapped))
;
}
static inline void au_unset_mmapped(struct file *f)
{
atomic_dec(&au_fi(f)->fi_mmapped);
}
static inline int au_test_mmapped(struct file *f)
{
return atomic_read(&au_fi(f)->fi_mmapped);
}
/* customize vma->vm_file */
static inline void au_do_vm_file_reset(struct vm_area_struct *vma,
struct file *file)
{
struct file *f;
f = vma->vm_file;
get_file(file);
vma->vm_file = file;
fput(f);
}
#ifdef CONFIG_MMU
#define AuDbgVmRegion(file, vma) do {} while (0)
static inline void au_vm_file_reset(struct vm_area_struct *vma,
struct file *file)
{
au_do_vm_file_reset(vma, file);
}
#else
#define AuDbgVmRegion(file, vma) \
AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file))
static inline void au_vm_file_reset(struct vm_area_struct *vma,
struct file *file)
{
struct file *f;
au_do_vm_file_reset(vma, file);
f = vma->vm_region->vm_file;
get_file(file);
vma->vm_region->vm_file = file;
fput(f);
}
#endif /* CONFIG_MMU */
/* handle vma->vm_prfile */
static inline void au_vm_prfile_set(struct vm_area_struct *vma,
struct file *file)
{
get_file(file);
vma->vm_prfile = file;
#ifndef CONFIG_MMU
get_file(file);
vma->vm_region->vm_prfile = file;
#endif
}
#endif /* __KERNEL__ */
#endif /* __AUFS_FILE_H__ */
|