zfs/lib/libzpool/include/sys/zfs_vfsops.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 2008 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 #include <sys/rrwlock.h>
  37 #include <sys/zfs_ioctl.h>
  38
  39 #ifdef  __cplusplus
  40 extern "C" {
  41 #endif
  42
  43 typedef struct zfsvfs zfsvfs_t;
  44
  45 struct zfsvfs {
  46         vfs_t           *z_vfs;         /* generic fs struct */
  47         zfsvfs_t        *z_parent;      /* parent fs */
  48         objset_t        *z_os;          /* objset reference */
  49         uint64_t        z_root;         /* id of root znode */
  50         uint64_t        z_unlinkedobj;  /* id of unlinked zapobj */
  51         uint64_t        z_max_blksz;    /* maximum block size for files */
  52         uint64_t        z_assign;       /* TXG_NOWAIT or set by zil_replay() */
  53         uint64_t        z_fuid_obj;     /* fuid table object number */
  54         uint64_t        z_fuid_size;    /* fuid table size */
  55         avl_tree_t      z_fuid_idx;     /* fuid tree keyed by index */
  56         avl_tree_t      z_fuid_domain;  /* fuid tree keyed by domain */
  57         krwlock_t       z_fuid_lock;    /* fuid lock */
  58         boolean_t       z_fuid_loaded;  /* fuid tables are loaded */
  59         struct zfs_fuid_info    *z_fuid_replay; /* fuid info for replay */
  60         zilog_t         *z_log;         /* intent log pointer */
  61         uint_t          z_acl_mode;     /* acl chmod/mode behavior */
  62         uint_t          z_acl_inherit;  /* acl inheritance behavior */
  63         zfs_case_t      z_case;         /* case-sense */
  64         boolean_t       z_utf8;         /* utf8-only */
  65         int             z_norm;         /* normalization flags */
  66         boolean_t       z_atime;        /* enable atimes mount option */
  67         boolean_t       z_unmounted;    /* unmounted */
  68         rrwlock_t       z_teardown_lock;
  69         krwlock_t       z_teardown_inactive_lock;
  70         list_t          z_all_znodes;   /* all vnodes in the fs */
  71         kmutex_t        z_znodes_lock;  /* lock for z_all_znodes */
  72         vnode_t         *z_ctldir;      /* .zfs directory pointer */
  73         boolean_t       z_show_ctldir;  /* expose .zfs in the root dir */
  74         boolean_t       z_issnap;       /* true if this is a snapshot */
  75         boolean_t       z_vscan;        /* virus scan on/off */
  76         boolean_t       z_use_fuids;    /* version allows fuids */
  77         kmutex_t        z_online_recv_lock; /* recv in prog grabs as WRITER */
  78         uint64_t        z_version;      /* ZPL version */
  79 #define ZFS_OBJ_MTX_SZ  64
  80         kmutex_t        z_hold_mtx[ZFS_OBJ_MTX_SZ];     /* znode hold locks */
  81 };
  82
  83 /*
  84  * Normal filesystems (those not under .zfs/snapshot) have a total
  85  * file ID size limited to 12 bytes (including the length field) due to
  86  * NFSv2 protocol's limitation of 32 bytes for a filehandle.  For historical
  87  * reasons, this same limit is being imposed by the Solaris NFSv3 implementation
  88  * (although the NFSv3 protocol actually permits a maximum of 64 bytes).  It
  89  * is not possible to expand beyond 12 bytes without abandoning support
  90  * of NFSv2.
  91  *
  92  * For normal filesystems, we partition up the available space as follows:
  93  *      2 bytes         fid length (required)
  94  *      6 bytes         object number (48 bits)
  95  *      4 bytes         generation number (32 bits)
  96  *
  97  * We reserve only 48 bits for the object number, as this is the limit
  98  * currently defined and imposed by the DMU.
  99  */
 100 typedef struct zfid_short {
 101         uint16_t        zf_len;
 102         uint8_t         zf_object[6];           /* obj[i] = obj >> (8 * i) */
 103         uint8_t         zf_gen[4];              /* gen[i] = gen >> (8 * i) */
 104 } zfid_short_t;
 105
 106 /*
 107  * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes
 108  * (including the length field).  This makes files under .zfs/snapshot
 109  * accessible by NFSv3 and NFSv4, but not NFSv2.
 110  *
 111  * For files under .zfs/snapshot, we partition up the available space
 112  * as follows:
 113  *      2 bytes         fid length (required)
 114  *      6 bytes         object number (48 bits)
 115  *      4 bytes         generation number (32 bits)
 116  *      6 bytes         objset id (48 bits)
 117  *      4 bytes         currently just zero (32 bits)
 118  *
 119  * We reserve only 48 bits for the object number and objset id, as these are
 120  * the limits currently defined and imposed by the DMU.
 121  */
 122 typedef struct zfid_long {
 123         zfid_short_t    z_fid;
 124         uint8_t         zf_setid[6];            /* obj[i] = obj >> (8 * i) */
 125         uint8_t         zf_setgen[4];           /* gen[i] = gen >> (8 * i) */
 126 } zfid_long_t;
 127
 128 #define SHORT_FID_LEN   (sizeof (zfid_short_t) - sizeof (uint16_t))
 129 #define LONG_FID_LEN    (sizeof (zfid_long_t) - sizeof (uint16_t))
 130
 131 extern uint_t zfs_fsyncer_key;
 132
 133 extern int zfs_suspend_fs(zfsvfs_t *zfsvfs, char *osname, int *mode);
 134 extern int zfs_resume_fs(zfsvfs_t *zfsvfs, const char *osname, int mode);
 135
 136 #ifdef  __cplusplus
 137 }
 138 #endif
 139
 140 #endif  /* _SYS_FS_ZFS_VFSOPS_H */