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 * Copyright (c) 2013, 2018 by Delphix. All rights reserved. 24 */ 25 26 #ifndef _SYS_FS_ZFS_VFSOPS_H 27 #define _SYS_FS_ZFS_VFSOPS_H 28 29 #include <sys/dataset_kstats.h> 30 #include <sys/isa_defs.h> 31 #include <sys/types32.h> 32 #include <sys/list.h> 33 #include <sys/vfs.h> 34 #include <sys/zil.h> 35 #include <sys/sa.h> 36 #include <sys/rrwlock.h> 37 #include <sys/dsl_dataset.h> 38 #include <sys/zfs_ioctl.h> 39 #include <sys/objlist.h> 40 41 #ifdef __cplusplus 42 extern "C" { 43 #endif 44 45 typedef struct zfsvfs zfsvfs_t; 46 struct znode; 47 48 /* 49 * This structure emulates the vfs_t from other platforms. It's purpose 50 * is to facilitate the handling of mount options and minimize structural 51 * differences between the platforms. 52 */ 53 typedef struct vfs { 54 struct zfsvfs *vfs_data; 55 char *vfs_mntpoint; /* Primary mount point */ 56 uint64_t vfs_xattr; 57 boolean_t vfs_readonly; 58 boolean_t vfs_do_readonly; 59 boolean_t vfs_setuid; 60 boolean_t vfs_do_setuid; 61 boolean_t vfs_exec; 62 boolean_t vfs_do_exec; 63 boolean_t vfs_devices; 64 boolean_t vfs_do_devices; 65 boolean_t vfs_do_xattr; 66 boolean_t vfs_atime; 67 boolean_t vfs_do_atime; 68 boolean_t vfs_relatime; 69 boolean_t vfs_do_relatime; 70 boolean_t vfs_nbmand; 71 boolean_t vfs_do_nbmand; 72 } vfs_t; 73 74 typedef struct zfs_mnt { 75 const char *mnt_osname; /* Objset name */ 76 char *mnt_data; /* Raw mount options */ 77 } zfs_mnt_t; 78 79 struct zfsvfs { 80 vfs_t *z_vfs; /* generic fs struct */ 81 struct super_block *z_sb; /* generic super_block */ 82 struct zfsvfs *z_parent; /* parent fs */ 83 objset_t *z_os; /* objset reference */ 84 uint64_t z_flags; /* super_block flags */ 85 uint64_t z_root; /* id of root znode */ 86 uint64_t z_unlinkedobj; /* id of unlinked zapobj */ 87 uint64_t z_max_blksz; /* maximum block size for files */ 88 uint64_t z_fuid_obj; /* fuid table object number */ 89 uint64_t z_fuid_size; /* fuid table size */ 90 avl_tree_t z_fuid_idx; /* fuid tree keyed by index */ 91 avl_tree_t z_fuid_domain; /* fuid tree keyed by domain */ 92 krwlock_t z_fuid_lock; /* fuid lock */ 93 boolean_t z_fuid_loaded; /* fuid tables are loaded */ 94 boolean_t z_fuid_dirty; /* need to sync fuid table ? */ 95 struct zfs_fuid_info *z_fuid_replay; /* fuid info for replay */ 96 zilog_t *z_log; /* intent log pointer */ 97 uint_t z_acl_mode; /* acl chmod/mode behavior */ 98 uint_t z_acl_inherit; /* acl inheritance behavior */ 99 uint_t z_acl_type; /* type of ACL usable on this FS */ 100 zfs_case_t z_case; /* case-sense */ 101 boolean_t z_utf8; /* utf8-only */ 102 int z_norm; /* normalization flags */ 103 boolean_t z_relatime; /* enable relatime mount option */ 104 boolean_t z_unmounted; /* unmounted */ 105 rrmlock_t z_teardown_lock; 106 krwlock_t z_teardown_inactive_lock; 107 list_t z_all_znodes; /* all znodes in the fs */ 108 uint64_t z_nr_znodes; /* number of znodes in the fs */ 109 unsigned long z_rollback_time; /* last online rollback time */ 110 unsigned long z_snap_defer_time; /* last snapshot unmount deferral */ 111 kmutex_t z_znodes_lock; /* lock for z_all_znodes */ 112 arc_prune_t *z_arc_prune; /* called by ARC to prune caches */ 113 struct inode *z_ctldir; /* .zfs directory inode */ 114 boolean_t z_show_ctldir; /* expose .zfs in the root dir */ 115 boolean_t z_issnap; /* true if this is a snapshot */ 116 boolean_t z_vscan; /* virus scan on/off */ 117 boolean_t z_use_fuids; /* version allows fuids */ 118 boolean_t z_replay; /* set during ZIL replay */ 119 boolean_t z_use_sa; /* version allow system attributes */ 120 boolean_t z_xattr_sa; /* allow xattrs to be stores as SA */ 121 boolean_t z_draining; /* is true when drain is active */ 122 boolean_t z_drain_cancel; /* signal the unlinked drain to stop */ 123 uint64_t z_version; /* ZPL version */ 124 uint64_t z_shares_dir; /* hidden shares dir */ 125 dataset_kstats_t z_kstat; /* fs kstats */ 126 kmutex_t z_lock; 127 uint64_t z_userquota_obj; 128 uint64_t z_groupquota_obj; 129 uint64_t z_userobjquota_obj; 130 uint64_t z_groupobjquota_obj; 131 uint64_t z_projectquota_obj; 132 uint64_t z_projectobjquota_obj; 133 uint64_t z_replay_eof; /* New end of file - replay only */ 134 sa_attr_type_t *z_attr_table; /* SA attr mapping->id */ 135 uint64_t z_hold_size; /* znode hold array size */ 136 avl_tree_t *z_hold_trees; /* znode hold trees */ 137 kmutex_t *z_hold_locks; /* znode hold locks */ 138 taskqid_t z_drain_task; /* task id for the unlink drain task */ 139 }; 140 141 #define ZSB_XATTR 0x0001 /* Enable user xattrs */ 142 143 /* 144 * Allow a maximum number of links. While ZFS does not internally limit 145 * this the inode->i_nlink member is defined as an unsigned int. To be 146 * safe we use 2^31-1 as the limit. 147 */ 148 #define ZFS_LINK_MAX ((1U << 31) - 1U) 149 150 /* 151 * Normal filesystems (those not under .zfs/snapshot) have a total 152 * file ID size limited to 12 bytes (including the length field) due to 153 * NFSv2 protocol's limitation of 32 bytes for a filehandle. For historical 154 * reasons, this same limit is being imposed by the Solaris NFSv3 implementation 155 * (although the NFSv3 protocol actually permits a maximum of 64 bytes). It 156 * is not possible to expand beyond 12 bytes without abandoning support 157 * of NFSv2. 158 * 159 * For normal filesystems, we partition up the available space as follows: 160 * 2 bytes fid length (required) 161 * 6 bytes object number (48 bits) 162 * 4 bytes generation number (32 bits) 163 * 164 * We reserve only 48 bits for the object number, as this is the limit 165 * currently defined and imposed by the DMU. 166 */ 167 typedef struct zfid_short { 168 uint16_t zf_len; 169 uint8_t zf_object[6]; /* obj[i] = obj >> (8 * i) */ 170 uint8_t zf_gen[4]; /* gen[i] = gen >> (8 * i) */ 171 } zfid_short_t; 172 173 /* 174 * Filesystems under .zfs/snapshot have a total file ID size of 22 bytes 175 * (including the length field). This makes files under .zfs/snapshot 176 * accessible by NFSv3 and NFSv4, but not NFSv2. 177 * 178 * For files under .zfs/snapshot, we partition up the available space 179 * as follows: 180 * 2 bytes fid length (required) 181 * 6 bytes object number (48 bits) 182 * 4 bytes generation number (32 bits) 183 * 6 bytes objset id (48 bits) 184 * 4 bytes currently just zero (32 bits) 185 * 186 * We reserve only 48 bits for the object number and objset id, as these are 187 * the limits currently defined and imposed by the DMU. 188 */ 189 typedef struct zfid_long { 190 zfid_short_t z_fid; 191 uint8_t zf_setid[6]; /* obj[i] = obj >> (8 * i) */ 192 uint8_t zf_setgen[4]; /* gen[i] = gen >> (8 * i) */ 193 } zfid_long_t; 194 195 #define SHORT_FID_LEN (sizeof (zfid_short_t) - sizeof (uint16_t)) 196 #define LONG_FID_LEN (sizeof (zfid_long_t) - sizeof (uint16_t)) 197 198 extern void zfs_init(void); 199 extern void zfs_fini(void); 200 201 extern int zfs_suspend_fs(zfsvfs_t *zfsvfs); 202 extern int zfs_resume_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds); 203 extern int zfs_end_fs(zfsvfs_t *zfsvfs, struct dsl_dataset *ds); 204 extern void zfs_exit_fs(zfsvfs_t *zfsvfs); 205 extern int zfs_set_version(zfsvfs_t *zfsvfs, uint64_t newvers); 206 extern int zfsvfs_create(const char *name, boolean_t readony, zfsvfs_t **zfvp); 207 extern int zfsvfs_create_impl(zfsvfs_t **zfvp, zfsvfs_t *zfsvfs, objset_t *os); 208 extern void zfsvfs_free(zfsvfs_t *zfsvfs); 209 extern int zfs_check_global_label(const char *dsname, const char *hexsl); 210 211 extern boolean_t zfs_is_readonly(zfsvfs_t *zfsvfs); 212 extern int zfs_domount(struct super_block *sb, zfs_mnt_t *zm, int silent); 213 extern void zfs_preumount(struct super_block *sb); 214 extern int zfs_umount(struct super_block *sb); 215 extern int zfs_remount(struct super_block *sb, int *flags, zfs_mnt_t *zm); 216 extern int zfs_statvfs(struct inode *ip, struct kstatfs *statp); 217 extern int zfs_vget(struct super_block *sb, struct inode **ipp, fid_t *fidp); 218 extern int zfs_prune(struct super_block *sb, unsigned long nr_to_scan, 219 int *objects); 220 extern int zfs_get_temporary_prop(dsl_dataset_t *ds, zfs_prop_t zfs_prop, 221 uint64_t *val, char *setpoint); 222 223 #ifdef __cplusplus 224 } 225 #endif 226 227 #endif /* _SYS_FS_ZFS_VFSOPS_H */ 228