include/os/freebsd/zfs/sys/zfs_vfsops_os.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 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 Pawel Jakub Dawidek <pawel@dawidek.net>.
  24  * All rights reserved.
  25  */
  26
  27 #ifndef _SYS_FS_ZFS_VFSOPS_H
  28 #define _SYS_FS_ZFS_VFSOPS_H
  29
  30 #if __FreeBSD_version >= 1300125
  31 #define TEARDOWN_RMS
  32 #endif
  33
  34 #if __FreeBSD_version >= 1300109
  35 #define TEARDOWN_INACTIVE_RMS
  36 #endif
  37
  38 #include <sys/dataset_kstats.h>
  39 #include <sys/list.h>
  40 #include <sys/vfs.h>
  41 #include <sys/zil.h>
  42 #include <sys/sa.h>
  43 #include <sys/rrwlock.h>
  44 #ifdef TEARDOWN_INACTIVE_RMS
  45 #include <sys/rmlock.h>
  46 #endif
  47 #include <sys/zfs_ioctl.h>
  48
  49 #ifdef  __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 #ifdef TEARDOWN_RMS
  54 typedef struct rmslock zfs_teardown_lock_t;
  55 #else
  56 #define zfs_teardown_lock_t             rrmlock_t
  57 #endif
  58
  59 #ifdef TEARDOWN_INACTIVE_RMS
  60 typedef struct rmslock zfs_teardown_inactive_lock_t;
  61 #else
  62 #define zfs_teardown_inactive_lock_t krwlock_t
  63 #endif
  64
  65 typedef struct zfsvfs zfsvfs_t;
  66 struct znode;
  67
  68 struct zfsvfs {
  69         vfs_t           *z_vfs;         /* generic fs struct */
  70         zfsvfs_t        *z_parent;      /* parent fs */
  71         objset_t        *z_os;          /* objset reference */
  72         uint64_t        z_flags;        /* super_block flags */
  73         uint64_t        z_root;         /* id of root znode */
  74         uint64_t        z_unlinkedobj;  /* id of unlinked zapobj */
  75         uint64_t        z_max_blksz;    /* maximum block size for files */
  76         uint64_t        z_fuid_obj;     /* fuid table object number */
  77         uint64_t        z_fuid_size;    /* fuid table size */
  78         avl_tree_t      z_fuid_idx;     /* fuid tree keyed by index */
  79         avl_tree_t      z_fuid_domain;  /* fuid tree keyed by domain */
  80         krwlock_t       z_fuid_lock;    /* fuid lock */
  81         boolean_t       z_fuid_loaded;  /* fuid tables are loaded */
  82         boolean_t       z_fuid_dirty;   /* need to sync fuid table ? */
  83         struct zfs_fuid_info    *z_fuid_replay; /* fuid info for replay */
  84         zilog_t         *z_log;         /* intent log pointer */
  85         uint_t          z_acl_type;     /* type of acl usable on this fs */
  86         uint_t          z_acl_mode;     /* acl chmod/mode behavior */
  87         uint_t          z_acl_inherit;  /* acl inheritance behavior */
  88         zfs_case_t      z_case;         /* case-sense */
  89         boolean_t       z_utf8;         /* utf8-only */
  90         int             z_norm;         /* normalization flags */
  91         boolean_t       z_atime;        /* enable atimes mount option */
  92         boolean_t       z_unmounted;    /* unmounted */
  93         zfs_teardown_lock_t z_teardown_lock;
  94         zfs_teardown_inactive_lock_t z_teardown_inactive_lock;
  95         list_t          z_all_znodes;   /* all vnodes in the fs */
  96         kmutex_t        z_znodes_lock;  /* lock for z_all_znodes */
  97         struct zfsctl_root      *z_ctldir;      /* .zfs directory pointer */
  98         boolean_t       z_show_ctldir;  /* expose .zfs in the root dir */
  99         boolean_t       z_issnap;       /* true if this is a snapshot */
 100         boolean_t       z_use_fuids;    /* version allows fuids */
 101         boolean_t       z_replay;       /* set during ZIL replay */
 102         boolean_t       z_use_sa;       /* version allow system attributes */
 103         boolean_t       z_xattr_sa;     /* allow xattrs to be stores as SA */
 104         boolean_t       z_use_namecache; /* make use of FreeBSD name cache */
 105         uint8_t         z_xattr;        /* xattr type in use */
 106         uint64_t        z_version;      /* ZPL version */
 107         uint64_t        z_shares_dir;   /* hidden shares dir */
 108         dataset_kstats_t        z_kstat;        /* fs kstats */
 109         kmutex_t        z_lock;
 110         uint64_t        z_userquota_obj;
 111         uint64_t        z_groupquota_obj;
 112         uint64_t        z_userobjquota_obj;
 113         uint64_t        z_groupobjquota_obj;
 114         uint64_t        z_projectquota_obj;
 115         uint64_t        z_projectobjquota_obj;
 116         uint64_t        z_replay_eof;   /* New end of file - replay only */
 117         sa_attr_type_t  *z_attr_table;  /* SA attr mapping->id */
 118 #define ZFS_OBJ_MTX_SZ  64
 119         kmutex_t        z_hold_mtx[ZFS_OBJ_MTX_SZ];     /* znode hold locks */
 120         struct task     z_unlinked_drain_task;
 121 };
 122
 123 #ifdef TEARDOWN_RMS
 124 #define ZFS_TEARDOWN_INIT(zfsvfs)               \
 125         rms_init(&(zfsvfs)->z_teardown_lock, "zfs teardown")
 126
 127 #define ZFS_TEARDOWN_DESTROY(zfsvfs)            \
 128         rms_destroy(&(zfsvfs)->z_teardown_lock)
 129
 130 #define ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag)    \
 131         rms_rlock(&(zfsvfs)->z_teardown_lock);
 132
 133 #define ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag)     \
 134         rms_runlock(&(zfsvfs)->z_teardown_lock)
 135
 136 #define ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, tag)   \
 137         rms_wlock(&(zfsvfs)->z_teardown_lock)
 138
 139 #define ZFS_TEARDOWN_EXIT_WRITE(zfsvfs)         \
 140         rms_wunlock(&(zfsvfs)->z_teardown_lock)
 141
 142 #define ZFS_TEARDOWN_EXIT(zfsvfs, tag)          \
 143         rms_unlock(&(zfsvfs)->z_teardown_lock)
 144
 145 #define ZFS_TEARDOWN_READ_HELD(zfsvfs)          \
 146         rms_rowned(&(zfsvfs)->z_teardown_lock)
 147
 148 #define ZFS_TEARDOWN_WRITE_HELD(zfsvfs)         \
 149         rms_wowned(&(zfsvfs)->z_teardown_lock)
 150
 151 #define ZFS_TEARDOWN_HELD(zfsvfs)               \
 152         rms_owned_any(&(zfsvfs)->z_teardown_lock)
 153 #else
 154 #define ZFS_TEARDOWN_INIT(zfsvfs)               \
 155         rrm_init(&(zfsvfs)->z_teardown_lock, B_FALSE)
 156
 157 #define ZFS_TEARDOWN_DESTROY(zfsvfs)            \
 158         rrm_destroy(&(zfsvfs)->z_teardown_lock)
 159
 160 #define ZFS_TEARDOWN_ENTER_READ(zfsvfs, tag)    \
 161         rrm_enter_read(&(zfsvfs)->z_teardown_lock, tag);
 162
 163 #define ZFS_TEARDOWN_EXIT_READ(zfsvfs, tag)     \
 164         rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
 165
 166 #define ZFS_TEARDOWN_ENTER_WRITE(zfsvfs, tag)   \
 167         rrm_enter(&(zfsvfs)->z_teardown_lock, RW_WRITER, tag)
 168
 169 #define ZFS_TEARDOWN_EXIT_WRITE(zfsvfs)         \
 170         rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
 171
 172 #define ZFS_TEARDOWN_EXIT(zfsvfs, tag)          \
 173         rrm_exit(&(zfsvfs)->z_teardown_lock, tag)
 174
 175 #define ZFS_TEARDOWN_READ_HELD(zfsvfs)          \
 176         RRM_READ_HELD(&(zfsvfs)->z_teardown_lock)
 177
 178 #define ZFS_TEARDOWN_WRITE_HELD(zfsvfs)         \
 179         RRM_WRITE_HELD(&(zfsvfs)->z_teardown_lock)
 180
 181 #define ZFS_TEARDOWN_HELD(zfsvfs)               \
 182         RRM_LOCK_HELD(&(zfsvfs)->z_teardown_lock)
 183 #endif
 184
 185 #ifdef TEARDOWN_INACTIVE_RMS
 186 #define ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs)              \
 187         rms_init(&(zfsvfs)->z_teardown_inactive_lock, "zfs teardown inactive")
 188
 189 #define ZFS_TEARDOWN_INACTIVE_DESTROY(zfsvfs)           \
 190         rms_destroy(&(zfsvfs)->z_teardown_inactive_lock)
 191
 192 #define ZFS_TEARDOWN_INACTIVE_TRY_ENTER_READ(zfsvfs)    \
 193         rms_try_rlock(&(zfsvfs)->z_teardown_inactive_lock)
 194
 195 #define ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs)        \
 196         rms_rlock(&(zfsvfs)->z_teardown_inactive_lock)
 197
 198 #define ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs)         \
 199         rms_runlock(&(zfsvfs)->z_teardown_inactive_lock)
 200
 201 #define ZFS_TEARDOWN_INACTIVE_ENTER_WRITE(zfsvfs)       \
 202         rms_wlock(&(zfsvfs)->z_teardown_inactive_lock)
 203
 204 #define ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs)        \
 205         rms_wunlock(&(zfsvfs)->z_teardown_inactive_lock)
 206
 207 #define ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs)        \
 208         rms_wowned(&(zfsvfs)->z_teardown_inactive_lock)
 209 #else
 210 #define ZFS_TEARDOWN_INACTIVE_INIT(zfsvfs)              \
 211         rw_init(&(zfsvfs)->z_teardown_inactive_lock, NULL, RW_DEFAULT, NULL)
 212
 213 #define ZFS_TEARDOWN_INACTIVE_DESTROY(zfsvfs)           \
 214         rw_destroy(&(zfsvfs)->z_teardown_inactive_lock)
 215
 216 #define ZFS_TEARDOWN_INACTIVE_TRY_ENTER_READ(zfsvfs)    \
 217         rw_tryenter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
 218
 219 #define ZFS_TEARDOWN_INACTIVE_ENTER_READ(zfsvfs)        \
 220         rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_READER)
 221
 222 #define ZFS_TEARDOWN_INACTIVE_EXIT_READ(zfsvfs)         \
 223         rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
 224
 225 #define ZFS_TEARDOWN_INACTIVE_ENTER_WRITE(zfsvfs)       \
 226         rw_enter(&(zfsvfs)->z_teardown_inactive_lock, RW_WRITER)
 227
 228 #define ZFS_TEARDOWN_INACTIVE_EXIT_WRITE(zfsvfs)        \
 229         rw_exit(&(zfsvfs)->z_teardown_inactive_lock)
 230
 231 #define ZFS_TEARDOWN_INACTIVE_WRITE_HELD(zfsvfs)        \
 232         RW_WRITE_HELD(&(zfsvfs)->z_teardown_inactive_lock)
 233 #endif
 234
 235 #define ZSB_XATTR       0x0001          /* Enable user xattrs */
 236 /*
 237  * Normal filesystems (those not under .zfs/snapshot) have a total
 238  * file ID size limited to 12 bytes (including the length field) due to
 239  * NFSv2 protocol's limitation of 32 bytes for a filehandle.  For historical
 240  * reasons, this same limit is being imposed by the Solaris NFSv3 implementation
 241  * (although the NFSv3 protocol actually permits a maximum of 64 bytes).  It
 242  * is not possible to expand beyond 12 bytes without abandoning support
 243  * of NFSv2.
 244  *
 245  * For normal filesystems, we partition up the available space as follows:
 246  *      2 bytes         fid length (required)
 247  *      6 bytes         object number (48 bits)
 248  *      4 bytes         generation number (32 bits)
 249  *
 250  * We reserve only 48 bits for the object number, as this is the limit
 251  * currently defined and imposed by the DMU.
 252  */
 253 typedef struct zfid_short {
 254         uint16_t        zf_len;
 255         uint8_t         zf_object[6];           /* obj[i] = obj >> (8 * i) */
 256         uint8_t         zf_gen[4];              /* gen[i] = gen >> (8 * i) */
 257 } zfid_short_t;
 258
 259 /*
 260  * Filesystems under .zfs/snapshot have a total file ID size of 22[*] bytes
 261  * (including the length field).  This makes files under .zfs/snapshot
 262  * accessible by NFSv3 and NFSv4, but not NFSv2.
 263  *
 264  * For files under .zfs/snapshot, we partition up the available space
 265  * as follows:
 266  *      2 bytes         fid length (required)
 267  *      6 bytes         object number (48 bits)
 268  *      4 bytes         generation number (32 bits)
 269  *      6 bytes         objset id (48 bits)
 270  *      4 bytes[**]     currently just zero (32 bits)
 271  *
 272  * We reserve only 48 bits for the object number and objset id, as these are
 273  * the limits currently defined and imposed by the DMU.
 274  *
 275  * [*] 20 bytes on FreeBSD to fit into the size of struct fid.
 276  * [**] 2 bytes on FreeBSD for the above reason.
 277  */
 278 typedef struct zfid_long {
 279         zfid_short_t    z_fid;
 280         uint8_t         zf_setid[6];            /* obj[i] = obj >> (8 * i) */
 281         uint8_t         zf_setgen[2];           /* gen[i] = gen >> (8 * i) */
 282 } zfid_long_t;
 283
 284 #define SHORT_FID_LEN   (sizeof (zfid_short_t) - sizeof (uint16_t))
 285 #define LONG_FID_LEN    (sizeof (zfid_long_t) - sizeof (uint16_t))
 286
 287 extern int zfs_super_owner;
 288
 289 extern void zfs_init(void);
 290 extern void zfs_fini(void);
 291
 292 extern int zfs_suspend_fs(zfsvfs_t *zfsvfs);
 293 extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds);
 294 extern int zfs_end_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds);
 295 extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers);
 296 extern int zfsvfs_create(const char *name, boolean_t readonly, zfsvfs_t **zfvp);
 297 extern int zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os);
 298 extern void zfsvfs_free(zfsvfs_t *zfsvfs);
 299 extern int zfs_check_global_label(const char *dsname, const char *hexsl);
 300 extern boolean_t zfs_is_readonly(zfsvfs_t *zfsvfs);
 301 extern int zfs_get_temporary_prop(struct dsl_dataset *ds, zfs_prop_t zfs_prop,
 302     uint64_t *val, char *setpoint);
 303 extern int zfs_busy(void);
 304
 305 #ifdef  __cplusplus
 306 }
 307 #endif
 308
 309 #endif  /* _SYS_FS_ZFS_VFSOPS_H */