kernel/fs/zfs/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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #ifndef _SYS_FS_ZFS_VFSOPS_H
  26 #define _SYS_FS_ZFS_VFSOPS_H
  27
  28 #include <sys/isa_defs.h>
  29 #include <sys/types32.h>
  30 #include <sys/list.h>
  31 #include <sys/vfs.h>
  32 #include <sys/zil.h>
  33 #include <sys/sa.h>
  34 #include <sys/rrwlock.h>
  35 #include <sys/zfs_ioctl.h>
  36
  37 #ifdef  __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 typedef struct zfsvfs zfsvfs_t;
  42 struct znode;
  43
  44 struct zfsvfs {
  45         vfs_t           *z_vfs;         /* generic fs struct */
  46         zfsvfs_t        *z_parent;      /* parent fs */
  47         objset_t        *z_os;          /* objset reference */
  48         uint64_t        z_root;         /* id of root znode */
  49         uint64_t        z_unlinkedobj;  /* id of unlinked zapobj */
  50         uint64_t        z_max_blksz;    /* maximum block size for files */
  51         uint64_t        z_fuid_obj;     /* fuid table object number */
  52         uint64_t        z_fuid_size;    /* fuid table size */
  53         avl_tree_t      z_fuid_idx;     /* fuid tree keyed by index */
  54         avl_tree_t      z_fuid_domain;  /* fuid tree keyed by domain */
  55         krwlock_t       z_fuid_lock;    /* fuid lock */
  56         boolean_t       z_fuid_loaded;  /* fuid tables are loaded */
  57         boolean_t       z_fuid_dirty;   /* need to sync fuid table ? */
  58         struct zfs_fuid_info    *z_fuid_replay; /* fuid info for replay */
  59         zilog_t         *z_log;         /* intent log pointer */
  60         uint_t          z_acl_mode;     /* acl chmod/mode behavior */
  61         uint_t          z_acl_inherit;  /* acl inheritance behavior */
  62         zfs_case_t      z_case;         /* case-sense */
  63         boolean_t       z_utf8;         /* utf8-only */
  64         int             z_norm;         /* normalization flags */
  65         boolean_t       z_atime;        /* enable atimes mount option */
  66         boolean_t       z_unmounted;    /* unmounted */
  67         rrmlock_t       z_teardown_lock;
  68         krwlock_t       z_teardown_inactive_lock;
  69         list_t          z_all_znodes;   /* all vnodes in the fs */
  70         kmutex_t        z_znodes_lock;  /* lock for z_all_znodes */
  71         vnode_t         *z_ctldir;      /* .zfs directory pointer */
  72         boolean_t       z_show_ctldir;  /* expose .zfs in the root dir */
  73         boolean_t       z_issnap;       /* true if this is a snapshot */
  74         boolean_t       z_vscan;        /* virus scan on/off */
  75         boolean_t       z_use_fuids;    /* version allows fuids */
  76         boolean_t       z_replay;       /* set during ZIL replay */
  77         boolean_t       z_use_sa;       /* version allow system attributes */
  78         uint64_t        z_version;      /* ZPL version */
  79         uint64_t        z_shares_dir;   /* hidden shares dir */
  80         kmutex_t        z_lock;
  81         uint64_t        z_userquota_obj;
  82         uint64_t        z_groupquota_obj;
  83         uint64_t        z_replay_eof;   /* New end of file - replay only */
  84         sa_attr_type_t  *z_attr_table;  /* SA attr mapping->id */
  85 #define ZFS_OBJ_MTX_SZ  64
  86         kmutex_t        z_hold_mtx[ZFS_OBJ_MTX_SZ];     /* znode hold locks */
  87 };
  88
  89 /*
  90  * Normal filesystems (those not under .zfs/snapshot) have a total
  91  * file ID size limited to 12 bytes (including the length field) due to
  92  * NFSv2 protocol's limitation of 32 bytes for a filehandle.  For historical
  93  * reasons, this same limit is being imposed by the Solaris NFSv3 implementation
  94  * (although the NFSv3 protocol actually permits a maximum of 64 bytes).  It
  95  * is not possible to expand beyond 12 bytes without abandoning support
  96  * of NFSv2.
  97  *
  98  * For normal filesystems, we partition up the available space as follows:
  99  *      2 bytes         fid length (required)
 100  *      6 bytes         object number (48 bits)
 101  *      4 bytes         generation number (32 bits)
 102  *
 103  * We reserve only 48 bits for the object number, as this is the limit
 104  * currently defined and imposed by the DMU.
 105  */
 106 typedef struct zfid_short {
 107         uint16_t        zf_len;
 108         uint8_t         zf_object[6];           /* obj[i] = obj >> (8 * i) */
 109         uint8_t         zf_gen[4];              /* gen[i] = gen >> (8 * i) */
 110 } zfid_short_t;
 111
 112 /*
 113  * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes
 114  * (including the length field).  This makes files under .zfs/snapshot
 115  * accessible by NFSv3 and NFSv4, but not NFSv2.
 116  *
 117  * For files under .zfs/snapshot, we partition up the available space
 118  * as follows:
 119  *      2 bytes         fid length (required)
 120  *      6 bytes         object number (48 bits)
 121  *      4 bytes         generation number (32 bits)
 122  *      6 bytes         objset id (48 bits)
 123  *      4 bytes         currently just zero (32 bits)
 124  *
 125  * We reserve only 48 bits for the object number and objset id, as these are
 126  * the limits currently defined and imposed by the DMU.
 127  */
 128 typedef struct zfid_long {
 129         zfid_short_t    z_fid;
 130         uint8_t         zf_setid[6];            /* obj[i] = obj >> (8 * i) */
 131         uint8_t         zf_setgen[4];           /* gen[i] = gen >> (8 * i) */
 132 } zfid_long_t;
 133
 134 #define SHORT_FID_LEN   (sizeof (zfid_short_t) - sizeof (uint16_t))
 135 #define LONG_FID_LEN    (sizeof (zfid_long_t) - sizeof (uint16_t))
 136
 137 extern uint_t zfs_fsyncer_key;
 138
 139 extern int zfs_suspend_fs(zfsvfs_t *zfsvfs);
 140 extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds);
 141 extern int zfs_userspace_one(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
 142     const char *domain, uint64_t rid, uint64_t *valuep);
 143 extern int zfs_userspace_many(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
 144     uint64_t *cookiep, void *vbuf, uint64_t *bufsizep);
 145 extern int zfs_set_userquota(zfsvfs_t *zfsvfs, zfs_userquota_prop_t type,
 146     const char *domain, uint64_t rid, uint64_t quota);
 147 extern boolean_t zfs_owner_overquota(zfsvfs_t *zfsvfs, struct znode *,
 148     boolean_t isgroup);
 149 extern boolean_t zfs_fuid_overquota(zfsvfs_t *zfsvfs, boolean_t isgroup,
 150     uint64_t fuid);
 151 extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers);
 152 extern int zfsvfs_create(const char *name, zfsvfs_t **zfvp);
 153 extern int zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os);
 154 extern void zfsvfs_free(zfsvfs_t *zfsvfs);
 155 extern int zfs_check_global_label(const char *dsname, const char *hexsl);
 156
 157 #ifdef  __cplusplus
 158 }
 159 #endif
 160
 161 #endif  /* _SYS_FS_ZFS_VFSOPS_H */