fs/aufs/opts.h

   1 /*
   2  * Copyright (C) 2005-2016 Junjiro R. Okajima
   3  *
   4  * This program, aufs is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /*
  19  * mount options/flags
  20  */
  21
  22 #ifndef __AUFS_OPTS_H__
  23 #define __AUFS_OPTS_H__
  24
  25 #ifdef __KERNEL__
  26
  27 #include <linux/path.h>
  28
  29 struct file;
  30 struct super_block;
  31
  32 /* ---------------------------------------------------------------------- */
  33
  34 /* mount flags */
  35 #define AuOpt_XINO              1               /* external inode number bitmap
  36                                                    and translation table */
  37 #define AuOpt_TRUNC_XINO        (1 << 1)        /* truncate xino files */
  38 #define AuOpt_UDBA_NONE         (1 << 2)        /* users direct branch access */
  39 #define AuOpt_UDBA_REVAL        (1 << 3)
  40 #define AuOpt_UDBA_HNOTIFY      (1 << 4)
  41 #define AuOpt_SHWH              (1 << 5)        /* show whiteout */
  42 #define AuOpt_PLINK             (1 << 6)        /* pseudo-link */
  43 #define AuOpt_DIRPERM1          (1 << 7)        /* ignore the lower dir's perm
  44                                                    bits */
  45 #define AuOpt_ALWAYS_DIROPQ     (1 << 9)        /* policy to creating diropq */
  46 #define AuOpt_SUM               (1 << 10)       /* summation for statfs(2) */
  47 #define AuOpt_SUM_W             (1 << 11)       /* unimplemented */
  48 #define AuOpt_WARN_PERM         (1 << 12)       /* warn when add-branch */
  49 #define AuOpt_VERBOSE           (1 << 13)       /* busy inode when del-branch */
  50 #define AuOpt_DIO               (1 << 14)       /* direct io */
  51
  52 #ifndef CONFIG_AUFS_HNOTIFY
  53 #undef AuOpt_UDBA_HNOTIFY
  54 #define AuOpt_UDBA_HNOTIFY      0
  55 #endif
  56 #ifndef CONFIG_AUFS_SHWH
  57 #undef AuOpt_SHWH
  58 #define AuOpt_SHWH              0
  59 #endif
  60
  61 #define AuOpt_Def       (AuOpt_XINO \
  62                          | AuOpt_UDBA_REVAL \
  63                          | AuOpt_PLINK \
  64                          /* | AuOpt_DIRPERM1 */ \
  65                          | AuOpt_WARN_PERM)
  66 #define AuOptMask_UDBA  (AuOpt_UDBA_NONE \
  67                          | AuOpt_UDBA_REVAL \
  68                          | AuOpt_UDBA_HNOTIFY)
  69
  70 #define au_opt_test(flags, name)        (flags & AuOpt_##name)
  71 #define au_opt_set(flags, name) do { \
  72         BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \
  73         ((flags) |= AuOpt_##name); \
  74 } while (0)
  75 #define au_opt_set_udba(flags, name) do { \
  76         (flags) &= ~AuOptMask_UDBA; \
  77         ((flags) |= AuOpt_##name); \
  78 } while (0)
  79 #define au_opt_clr(flags, name) do { \
  80         ((flags) &= ~AuOpt_##name); \
  81 } while (0)
  82
  83 static inline unsigned int au_opts_plink(unsigned int mntflags)
  84 {
  85 #ifdef CONFIG_PROC_FS
  86         return mntflags;
  87 #else
  88         return mntflags & ~AuOpt_PLINK;
  89 #endif
  90 }
  91
  92 /* ---------------------------------------------------------------------- */
  93
  94 /* policies to select one among multiple writable branches */
  95 enum {
  96         AuWbrCreate_TDP,        /* top down parent */
  97         AuWbrCreate_RR,         /* round robin */
  98         AuWbrCreate_MFS,        /* most free space */
  99         AuWbrCreate_MFSV,       /* mfs with seconds */
 100         AuWbrCreate_MFSRR,      /* mfs then rr */
 101         AuWbrCreate_MFSRRV,     /* mfs then rr with seconds */
 102         AuWbrCreate_TDMFS,      /* top down regardless parent and mfs */
 103         AuWbrCreate_TDMFSV,     /* top down regardless parent and mfs */
 104         AuWbrCreate_PMFS,       /* parent and mfs */
 105         AuWbrCreate_PMFSV,      /* parent and mfs with seconds */
 106         AuWbrCreate_PMFSRR,     /* parent, mfs and round-robin */
 107         AuWbrCreate_PMFSRRV,    /* plus seconds */
 108
 109         AuWbrCreate_Def = AuWbrCreate_TDP
 110 };
 111
 112 enum {
 113         AuWbrCopyup_TDP,        /* top down parent */
 114         AuWbrCopyup_BUP,        /* bottom up parent */
 115         AuWbrCopyup_BU,         /* bottom up */
 116
 117         AuWbrCopyup_Def = AuWbrCopyup_TDP
 118 };
 119
 120 /* ---------------------------------------------------------------------- */
 121
 122 struct au_opt_add {
 123         aufs_bindex_t   bindex;
 124         char            *pathname;
 125         int             perm;
 126         struct path     path;
 127 };
 128
 129 struct au_opt_del {
 130         char            *pathname;
 131         struct path     h_path;
 132 };
 133
 134 struct au_opt_mod {
 135         char            *path;
 136         int             perm;
 137         struct dentry   *h_root;
 138 };
 139
 140 struct au_opt_xino {
 141         char            *path;
 142         struct file     *file;
 143 };
 144
 145 struct au_opt_xino_itrunc {
 146         aufs_bindex_t   bindex;
 147 };
 148
 149 struct au_opt_wbr_create {
 150         int                     wbr_create;
 151         int                     mfs_second;
 152         unsigned long long      mfsrr_watermark;
 153 };
 154
 155 struct au_opt {
 156         int type;
 157         union {
 158                 struct au_opt_xino      xino;
 159                 struct au_opt_xino_itrunc xino_itrunc;
 160                 struct au_opt_add       add;
 161                 struct au_opt_del       del;
 162                 struct au_opt_mod       mod;
 163                 int                     dirwh;
 164                 int                     rdcache;
 165                 unsigned int            rdblk;
 166                 unsigned int            rdhash;
 167                 int                     udba;
 168                 struct au_opt_wbr_create wbr_create;
 169                 int                     wbr_copyup;
 170                 unsigned int            fhsm_second;
 171         };
 172 };
 173
 174 /* opts flags */
 175 #define AuOpts_REMOUNT          1
 176 #define AuOpts_REFRESH          (1 << 1)
 177 #define AuOpts_TRUNC_XIB        (1 << 2)
 178 #define AuOpts_REFRESH_DYAOP    (1 << 3)
 179 #define AuOpts_REFRESH_IDOP     (1 << 4)
 180 #define au_ftest_opts(flags, name)      ((flags) & AuOpts_##name)
 181 #define au_fset_opts(flags, name) \
 182         do { (flags) |= AuOpts_##name; } while (0)
 183 #define au_fclr_opts(flags, name) \
 184         do { (flags) &= ~AuOpts_##name; } while (0)
 185
 186 struct au_opts {
 187         struct au_opt   *opt;
 188         int             max_opt;
 189
 190         unsigned int    given_udba;
 191         unsigned int    flags;
 192         unsigned long   sb_flags;
 193 };
 194
 195 /* ---------------------------------------------------------------------- */
 196
 197 /* opts.c */
 198 void au_optstr_br_perm(au_br_perm_str_t *str, int perm);
 199 const char *au_optstr_udba(int udba);
 200 const char *au_optstr_wbr_copyup(int wbr_copyup);
 201 const char *au_optstr_wbr_create(int wbr_create);
 202
 203 void au_opts_free(struct au_opts *opts);
 204 int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts);
 205 int au_opts_verify(struct super_block *sb, unsigned long sb_flags,
 206                    unsigned int pending);
 207 int au_opts_mount(struct super_block *sb, struct au_opts *opts);
 208 int au_opts_remount(struct super_block *sb, struct au_opts *opts);
 209
 210 unsigned int au_opt_udba(struct super_block *sb);
 211
 212 #endif /* __KERNEL__ */
 213 #endif /* __AUFS_OPTS_H__ */