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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #ifndef _SYS_FS_ZFS_VFSOPS_H 27 #define _SYS_FS_ZFS_VFSOPS_H 28 29 #pragma ident "%Z%%M% %I% %E% SMI" 30 31 #include <sys/isa_defs.h> 32 #include <sys/types32.h> 33 #include <sys/list.h> 34 #include <sys/vfs.h> 35 #include <sys/zil.h> 36 37 #ifdef __cplusplus 38 extern "C" { 39 #endif 40 41 typedef struct zfsvfs zfsvfs_t; 42 43 struct zfsvfs { 44 vfs_t *z_vfs; /* generic fs struct */ 45 zfsvfs_t *z_parent; /* parent fs */ 46 objset_t *z_os; /* objset reference */ 47 uint64_t z_root; /* id of root znode */ 48 uint64_t z_unlinkedobj; /* id of unlinked zapobj */ 49 uint64_t z_max_blksz; /* maximum block size for files */ 50 uint64_t z_assign; /* TXG_NOWAIT or set by zil_replay() */ 51 zilog_t *z_log; /* intent log pointer */ 52 uint_t z_acl_mode; /* acl chmod/mode behavior */ 53 uint_t z_acl_inherit; /* acl inheritance behavior */ 54 boolean_t z_atime; /* enable atimes mount option */ 55 boolean_t z_unmounted; /* unmounted */ 56 krwlock_t z_unmount_lock; 57 krwlock_t z_unmount_inactive_lock; 58 list_t z_all_znodes; /* all vnodes in the fs */ 59 kmutex_t z_znodes_lock; /* lock for z_all_znodes */ 60 vnode_t *z_ctldir; /* .zfs directory pointer */ 61 boolean_t z_show_ctldir; /* expose .zfs in the root dir */ 62 boolean_t z_issnap; /* true if this is a snapshot */ 63 uint64_t z_version; 64 #define ZFS_OBJ_MTX_SZ 64 65 kmutex_t z_hold_mtx[ZFS_OBJ_MTX_SZ]; /* znode hold locks */ 66 }; 67 68 /* 69 * Normal filesystems (those not under .zfs/snapshot) have a total 70 * file ID size limited to 12 bytes (including the length field) due to 71 * NFSv2 protocol's limitation of 32 bytes for a filehandle. For historical 72 * reasons, this same limit is being imposed by the Solaris NFSv3 implementation 73 * (although the NFSv3 protocol actually permits a maximum of 64 bytes). It 74 * is not possible to expand beyond 12 bytes without abandoning support 75 * of NFSv2. 76 * 77 * For normal filesystems, we partition up the available space as follows: 78 * 2 bytes fid length (required) 79 * 6 bytes object number (48 bits) 80 * 4 bytes generation number (32 bits) 81 * 82 * We reserve only 48 bits for the object number, as this is the limit 83 * currently defined and imposed by the DMU. 84 */ 85 typedef struct zfid_short { 86 uint16_t zf_len; 87 uint8_t zf_object[6]; /* obj[i] = obj >> (8 * i) */ 88 uint8_t zf_gen[4]; /* gen[i] = gen >> (8 * i) */ 89 } zfid_short_t; 90 91 /* 92 * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes 93 * (including the length field). This makes files under .zfs/snapshot 94 * accessible by NFSv3 and NFSv4, but not NFSv2. 95 * 96 * For files under .zfs/snapshot, we partition up the available space 97 * as follows: 98 * 2 bytes fid length (required) 99 * 6 bytes object number (48 bits) 100 * 4 bytes generation number (32 bits) 101 * 6 bytes objset id (48 bits) 102 * 4 bytes currently just zero (32 bits) 103 * 104 * We reserve only 48 bits for the object number and objset id, as these are 105 * the limits currently defined and imposed by the DMU. 106 */ 107 typedef struct zfid_long { 108 zfid_short_t z_fid; 109 uint8_t zf_setid[6]; /* obj[i] = obj >> (8 * i) */ 110 uint8_t zf_setgen[4]; /* gen[i] = gen >> (8 * i) */ 111 } zfid_long_t; 112 113 #define SHORT_FID_LEN (sizeof (zfid_short_t) - sizeof (uint16_t)) 114 #define LONG_FID_LEN (sizeof (zfid_long_t) - sizeof (uint16_t)) 115 116 extern uint_t zfs_fsyncer_key; 117 118 #ifdef __cplusplus 119 } 120 #endif 121 122 #endif /* _SYS_FS_ZFS_VFSOPS_H */ 123