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 https://opensource.org/licenses/CDDL-1.0. 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, const 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, const 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, const char *sname, 72 struct inode *tdip, const char *tname, cred_t *cr, int flags); 73 extern int zfsctl_snapdir_remove(struct inode *dip, const char *name, 74 cred_t *cr, int flags); 75 extern int zfsctl_snapdir_mkdir(struct inode *dip, const char *dirname, 76 vattr_t *vap, 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(const 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 */ 104