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 (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 struct zfs_sb;
  42 struct znode;
  43
  44 typedef struct zfs_sb {
  45         struct super_block *z_sb;       /* generic super_block */
  46         struct backing_dev_info z_bdi;  /* generic backing dev info */
  47         struct zfs_sb   *z_parent;      /* parent fs */
  48         objset_t        *z_os;          /* objset reference */
  49         uint64_t        z_flags;        /* super_block flags */
  50         uint64_t        z_root;         /* id of root znode */
  51         uint64_t        z_unlinkedobj;  /* id of unlinked zapobj */
  52         uint64_t        z_max_blksz;    /* maximum block size for files */
  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         boolean_t       z_fuid_dirty;   /* need to sync fuid table ? */
  60         struct zfs_fuid_info    *z_fuid_replay; /* fuid info for replay */
  61         zilog_t         *z_log;         /* intent log pointer */
  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         struct inode    *z_ctldir;      /* .zfs directory inode */
  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         boolean_t       z_replay;       /* set during ZIL replay */
  78         boolean_t       z_use_sa;       /* version allow system attributes */
  79         boolean_t       z_xattr_sa;     /* allow xattrs to be stores as SA */
  80         uint64_t        z_version;      /* ZPL version */
  81         uint64_t        z_shares_dir;   /* hidden shares dir */
  82         kmutex_t        z_lock;
  83         uint64_t        z_userquota_obj;
  84         uint64_t        z_groupquota_obj;
  85         uint64_t        z_replay_eof;   /* New end of file - replay only */
  86         sa_attr_type_t  *z_attr_table;  /* SA attr mapping->id */
  87 #define ZFS_OBJ_MTX_SZ  64
  88         kmutex_t        z_hold_mtx[ZFS_OBJ_MTX_SZ];     /* znode hold locks */
  89 } zfs_sb_t;
  90
  91 #define ZFS_SUPER_MAGIC 0x2fc12fc1
  92
  93 #define ZSB_XATTR       0x0001          /* Enable user xattrs */
  94
  95
  96 /*
  97  * Minimal snapshot helpers, the bulk of the Linux snapshot implementation
  98  * lives in the zpl_snap.c file which is part of the zpl source.
  99  */
 100 #define ZFS_CTLDIR_NAME         ".zfs"
 101
 102 #define zfs_has_ctldir(zdp)     \
 103         ((zdp)->z_id == ZTOZSB(zdp)->z_root && \
 104         (ZTOZSB(zdp)->z_ctldir != NULL))
 105 #define zfs_show_ctldir(zdp)    \
 106         (zfs_has_ctldir(zdp) && \
 107         (ZTOZSB(zdp)->z_show_ctldir))
 108
 109 #define ZFSCTL_INO_ROOT         0x1
 110 #define ZFSCTL_INO_SNAPDIR      0x2
 111 #define ZFSCTL_INO_SHARES       0x3
 112
 113 /*
 114  * Allow a maximum number of links.  While ZFS does not internally limit
 115  * this most Linux filesystems do.  It's probably a good idea to limit
 116  * this to a large value until it is validated that this is safe.
 117  */
 118 #define ZFS_LINK_MAX            65536
 119
 120 /*
 121  * Normal filesystems (those not under .zfs/snapshot) have a total
 122  * file ID size limited to 12 bytes (including the length field) due to
 123  * NFSv2 protocol's limitation of 32 bytes for a filehandle.  For historical
 124  * reasons, this same limit is being imposed by the Solaris NFSv3 implementation
 125  * (although the NFSv3 protocol actually permits a maximum of 64 bytes).  It
 126  * is not possible to expand beyond 12 bytes without abandoning support
 127  * of NFSv2.
 128  *
 129  * For normal filesystems, we partition up the available space as follows:
 130  *      2 bytes         fid length (required)
 131  *      6 bytes         object number (48 bits)
 132  *      4 bytes         generation number (32 bits)
 133  *
 134  * We reserve only 48 bits for the object number, as this is the limit
 135  * currently defined and imposed by the DMU.
 136  */
 137 typedef struct zfid_short {
 138         uint16_t        zf_len;
 139         uint8_t         zf_object[6];           /* obj[i] = obj >> (8 * i) */
 140         uint8_t         zf_gen[4];              /* gen[i] = gen >> (8 * i) */
 141 } zfid_short_t;
 142
 143 /*
 144  * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes
 145  * (including the length field).  This makes files under .zfs/snapshot
 146  * accessible by NFSv3 and NFSv4, but not NFSv2.
 147  *
 148  * For files under .zfs/snapshot, we partition up the available space
 149  * as follows:
 150  *      2 bytes         fid length (required)
 151  *      6 bytes         object number (48 bits)
 152  *      4 bytes         generation number (32 bits)
 153  *      6 bytes         objset id (48 bits)
 154  *      4 bytes         currently just zero (32 bits)
 155  *
 156  * We reserve only 48 bits for the object number and objset id, as these are
 157  * the limits currently defined and imposed by the DMU.
 158  */
 159 typedef struct zfid_long {
 160         zfid_short_t    z_fid;
 161         uint8_t         zf_setid[6];            /* obj[i] = obj >> (8 * i) */
 162         uint8_t         zf_setgen[4];           /* gen[i] = gen >> (8 * i) */
 163 } zfid_long_t;
 164
 165 #define SHORT_FID_LEN   (sizeof (zfid_short_t) - sizeof (uint16_t))
 166 #define LONG_FID_LEN    (sizeof (zfid_long_t) - sizeof (uint16_t))
 167
 168 extern uint_t zfs_fsyncer_key;
 169
 170 extern int zfs_suspend_fs(zfs_sb_t *zsb);
 171 extern int zfs_resume_fs(zfs_sb_t *zsb, const char *osname);
 172 extern int zfs_userspace_one(zfs_sb_t *zsb, zfs_userquota_prop_t type,
 173     const char *domain, uint64_t rid, uint64_t *valuep);
 174 extern int zfs_userspace_many(zfs_sb_t *zsb, zfs_userquota_prop_t type,
 175     uint64_t *cookiep, void *vbuf, uint64_t *bufsizep);
 176 extern int zfs_set_userquota(zfs_sb_t *zsb, zfs_userquota_prop_t type,
 177     const char *domain, uint64_t rid, uint64_t quota);
 178 extern boolean_t zfs_owner_overquota(zfs_sb_t *zsb, struct znode *,
 179     boolean_t isgroup);
 180 extern boolean_t zfs_fuid_overquota(zfs_sb_t *zsb, boolean_t isgroup,
 181     uint64_t fuid);
 182 extern int zfs_set_version(zfs_sb_t *zsb, uint64_t newvers);
 183 extern int zfs_get_zplprop(objset_t *os, zfs_prop_t prop,
 184     uint64_t *value);
 185 extern int zfs_sb_create(const char *name, zfs_sb_t **zsbp);
 186 extern int zfs_sb_setup(zfs_sb_t *zsb, boolean_t mounting);
 187 extern void zfs_sb_free(zfs_sb_t *zsb);
 188 extern int zfs_sb_teardown(zfs_sb_t *zsb, boolean_t unmounting);
 189 extern int zfs_check_global_label(const char *dsname, const char *hexsl);
 190 extern boolean_t zfs_is_readonly(zfs_sb_t *zsb);
 191
 192 extern int zfs_register_callbacks(zfs_sb_t *zsb);
 193 extern void zfs_unregister_callbacks(zfs_sb_t *zsb);
 194 extern int zfs_domount(struct super_block *sb, void *data, int silent);
 195 extern int zfs_umount(struct super_block *sb);
 196 extern int zfs_remount(struct super_block *sb, int *flags, char *data);
 197 extern int zfs_root(zfs_sb_t *zsb, struct inode **ipp);
 198 extern int zfs_statvfs(struct dentry *dentry, struct kstatfs *statp);
 199 extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp);
 200
 201 #ifdef  __cplusplus
 202 }
 203 #endif
 204
 205 #endif  /* _SYS_FS_ZFS_VFSOPS_H */