zfs/include/sys/zfs_ctldir.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
  24  * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
  25  * LLNL-CODE-403049.
  26  * Rewritten for Linux by:
  27  *   Rohan Puri <rohan.puri15@gmail.com>
  28  *   Brian Behlendorf <behlendorf1@llnl.gov>
  29  */
  30
  31 #ifndef _ZFS_CTLDIR_H
  32 #define _ZFS_CTLDIR_H
  33
  34 #include <sys/vnode.h>
  35 #include <sys/pathname.h>
  36 #include <sys/zfs_vfsops.h>
  37 #include <sys/zfs_znode.h>
  38
  39 #define ZFS_CTLDIR_NAME         ".zfs"
  40 #define ZFS_SNAPDIR_NAME        "snapshot"
  41 #define ZFS_SHAREDIR_NAME       "shares"
  42
  43 #define zfs_has_ctldir(zdp)     \
  44         ((zdp)->z_id == ZTOZSB(zdp)->z_root && \
  45         (ZTOZSB(zdp)->z_ctldir != NULL))
  46 #define zfs_show_ctldir(zdp)    \
  47         (zfs_has_ctldir(zdp) && \
  48         (ZTOZSB(zdp)->z_show_ctldir))
  49
  50 extern int zfs_expire_snapshot;
  51
  52 /* zfsctl generic functions */
  53 extern int zfsctl_create(zfsvfs_t *);
  54 extern void zfsctl_destroy(zfsvfs_t *);
  55 extern struct inode *zfsctl_root(znode_t *);
  56 extern void zfsctl_init(void);
  57 extern void zfsctl_fini(void);
  58 extern boolean_t zfsctl_is_node(struct inode *ip);
  59 extern boolean_t zfsctl_is_snapdir(struct inode *ip);
  60 extern int zfsctl_fid(struct inode *ip, fid_t *fidp);
  61
  62 /* zfsctl '.zfs' functions */
  63 extern int zfsctl_root_lookup(struct inode *dip, char *name,
  64     struct inode **ipp, int flags, cred_t *cr, int *direntflags,
  65     pathname_t *realpnp);
  66
  67 /* zfsctl '.zfs/snapshot' functions */
  68 extern int zfsctl_snapdir_lookup(struct inode *dip, char *name,
  69     struct inode **ipp, int flags, cred_t *cr, int *direntflags,
  70     pathname_t *realpnp);
  71 extern int zfsctl_snapdir_rename(struct inode *sdip, char *sname,
  72     struct inode *tdip, char *tname, cred_t *cr, int flags);
  73 extern int zfsctl_snapdir_remove(struct inode *dip, char *name, cred_t *cr,
  74     int flags);
  75 extern int zfsctl_snapdir_mkdir(struct inode *dip, char *dirname, vattr_t *vap,
  76     struct inode **ipp, cred_t *cr, int flags);
  77 extern int zfsctl_snapshot_mount(struct path *path, int flags);
  78 extern int zfsctl_snapshot_unmount(char *snapname, int flags);
  79 extern int zfsctl_snapshot_unmount_delay(spa_t *spa, uint64_t objsetid,
  80     int delay);
  81 extern int zfsctl_snapdir_vget(struct super_block *sb, uint64_t objsetid,
  82     int gen, struct inode **ipp);
  83
  84 /* zfsctl '.zfs/shares' functions */
  85 extern int zfsctl_shares_lookup(struct inode *dip, char *name,
  86     struct inode **ipp, int flags, cred_t *cr, int *direntflags,
  87     pathname_t *realpnp);
  88
  89 /*
  90  * These inodes numbers are reserved for the .zfs control directory.
  91  * It is important that they be no larger that 48-bits because only
  92  * 6 bytes are reserved in the NFS file handle for the object number.
  93  * However, they should be as large as possible to avoid conflicts
  94  * with the objects which are assigned monotonically by the dmu.
  95  */
  96 #define ZFSCTL_INO_ROOT         0x0000FFFFFFFFFFFFULL
  97 #define ZFSCTL_INO_SHARES       0x0000FFFFFFFFFFFEULL
  98 #define ZFSCTL_INO_SNAPDIR      0x0000FFFFFFFFFFFDULL
  99 #define ZFSCTL_INO_SNAPDIRS     0x0000FFFFFFFFFFFCULL
 100
 101 #define ZFSCTL_EXPIRE_SNAPSHOT  300
 102
 103 #endif  /* _ZFS_CTLDIR_H */