fs/aufs/cpup.h

   1 /*
   2  * Copyright (C) 2005-2017 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  * copy-up/down functions
  20  */
  21
  22 #ifndef __AUFS_CPUP_H__
  23 #define __AUFS_CPUP_H__
  24
  25 #ifdef __KERNEL__
  26
  27 #include <linux/path.h>
  28
  29 struct inode;
  30 struct file;
  31 struct au_pin;
  32
  33 void au_cpup_attr_flags(struct inode *dst, unsigned int iflags);
  34 void au_cpup_attr_timesizes(struct inode *inode);
  35 void au_cpup_attr_nlink(struct inode *inode, int force);
  36 void au_cpup_attr_changeable(struct inode *inode);
  37 void au_cpup_igen(struct inode *inode, struct inode *h_inode);
  38 void au_cpup_attr_all(struct inode *inode, int force);
  39
  40 /* ---------------------------------------------------------------------- */
  41
  42 struct au_cp_generic {
  43         struct dentry   *dentry;
  44         aufs_bindex_t   bdst, bsrc;
  45         loff_t          len;
  46         struct au_pin   *pin;
  47         unsigned int    flags;
  48 };
  49
  50 /* cpup flags */
  51 #define AuCpup_DTIME            1               /* do dtime_store/revert */
  52 #define AuCpup_KEEPLINO         (1 << 1)        /* do not clear the lower xino,
  53                                                    for link(2) */
  54 #define AuCpup_RENAME           (1 << 2)        /* rename after cpup */
  55 #define AuCpup_HOPEN            (1 << 3)        /* call h_open_pre/post() in
  56                                                    cpup */
  57 #define AuCpup_OVERWRITE        (1 << 4)        /* allow overwriting the
  58                                                    existing entry */
  59 #define AuCpup_RWDST            (1 << 5)        /* force write target even if
  60                                                    the branch is marked as RO */
  61
  62 #define au_ftest_cpup(flags, name)      ((flags) & AuCpup_##name)
  63 #define au_fset_cpup(flags, name) \
  64         do { (flags) |= AuCpup_##name; } while (0)
  65 #define au_fclr_cpup(flags, name) \
  66         do { (flags) &= ~AuCpup_##name; } while (0)
  67
  68 int au_copy_file(struct file *dst, struct file *src, loff_t len);
  69 int au_sio_cpup_simple(struct au_cp_generic *cpg);
  70 int au_sio_cpdown_simple(struct au_cp_generic *cpg);
  71 int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file);
  72
  73 int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst,
  74                int (*cp)(struct dentry *dentry, aufs_bindex_t bdst,
  75                          struct au_pin *pin,
  76                          struct dentry *h_parent, void *arg),
  77                void *arg);
  78 int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
  79 int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst);
  80
  81 /* ---------------------------------------------------------------------- */
  82
  83 /* keep timestamps when copyup */
  84 struct au_dtime {
  85         struct dentry *dt_dentry;
  86         struct path dt_h_path;
  87         struct timespec dt_atime, dt_mtime;
  88 };
  89 void au_dtime_store(struct au_dtime *dt, struct dentry *dentry,
  90                     struct path *h_path);
  91 void au_dtime_revert(struct au_dtime *dt);
  92
  93 #endif /* __KERNEL__ */
  94 #endif /* __AUFS_CPUP_H__ */