| 1 | /* |
| 2 | * Copyright (c) 2007-2008 The DragonFly Project. All rights reserved. |
| 3 | * |
| 4 | * This code is derived from software contributed to The DragonFly Project |
| 5 | * by Matthew Dillon <dillon@backplane.com> |
| 6 | * |
| 7 | * Redistribution and use in source and binary forms, with or without |
| 8 | * modification, are permitted provided that the following conditions |
| 9 | * are met: |
| 10 | * |
| 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in |
| 15 | * the documentation and/or other materials provided with the |
| 16 | * distribution. |
| 17 | * 3. Neither the name of The DragonFly Project nor the names of its |
| 18 | * contributors may be used to endorse or promote products derived |
| 19 | * from this software without specific, prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| 24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| 25 | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, |
| 26 | * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, |
| 27 | * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 28 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED |
| 29 | * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
| 30 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
| 31 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 32 | * SUCH DAMAGE. |
| 33 | * |
| 34 | * $DragonFly: src/sys/vfs/hammer/hammer_vfsops.c,v 1.74 2008/11/13 02:18:43 dillon Exp $ |
| 35 | */ |
| 36 | |
| 37 | #include <sys/param.h> |
| 38 | #include <sys/systm.h> |
| 39 | #include <sys/kernel.h> |
| 40 | #include <sys/vnode.h> |
| 41 | #include <sys/mount.h> |
| 42 | #include <sys/malloc.h> |
| 43 | #include <sys/nlookup.h> |
| 44 | #include <sys/fcntl.h> |
| 45 | #include <sys/sysctl.h> |
| 46 | #include <sys/buf.h> |
| 47 | #include <sys/buf2.h> |
| 48 | #include "hammer.h" |
| 49 | |
| 50 | int hammer_debug_io; |
| 51 | int hammer_debug_general; |
| 52 | int hammer_debug_debug = 1; /* medium-error panics */ |
| 53 | int hammer_debug_inode; |
| 54 | int hammer_debug_locks; |
| 55 | int hammer_debug_btree; |
| 56 | int hammer_debug_tid; |
| 57 | int hammer_debug_recover; /* -1 will disable, +1 will force */ |
| 58 | int hammer_debug_recover_faults; |
| 59 | int hammer_cluster_enable = 1; /* enable read clustering by default */ |
| 60 | int hammer_count_fsyncs; |
| 61 | int hammer_count_inodes; |
| 62 | int hammer_count_iqueued; |
| 63 | int hammer_count_reclaiming; |
| 64 | int hammer_count_records; |
| 65 | int hammer_count_record_datas; |
| 66 | int hammer_count_volumes; |
| 67 | int hammer_count_buffers; |
| 68 | int hammer_count_nodes; |
| 69 | int64_t hammer_count_extra_space_used; |
| 70 | int64_t hammer_stats_btree_lookups; |
| 71 | int64_t hammer_stats_btree_searches; |
| 72 | int64_t hammer_stats_btree_inserts; |
| 73 | int64_t hammer_stats_btree_deletes; |
| 74 | int64_t hammer_stats_btree_elements; |
| 75 | int64_t hammer_stats_btree_splits; |
| 76 | int64_t hammer_stats_btree_iterations; |
| 77 | int64_t hammer_stats_btree_root_iterations; |
| 78 | int64_t hammer_stats_record_iterations; |
| 79 | |
| 80 | int64_t hammer_stats_file_read; |
| 81 | int64_t hammer_stats_file_write; |
| 82 | int64_t hammer_stats_file_iopsr; |
| 83 | int64_t hammer_stats_file_iopsw; |
| 84 | int64_t hammer_stats_disk_read; |
| 85 | int64_t hammer_stats_disk_write; |
| 86 | int64_t hammer_stats_inode_flushes; |
| 87 | int64_t hammer_stats_commits; |
| 88 | |
| 89 | int hammer_count_dirtybufspace; /* global */ |
| 90 | int hammer_count_refedbufs; /* global */ |
| 91 | int hammer_count_reservations; |
| 92 | int hammer_count_io_running_read; |
| 93 | int hammer_count_io_running_write; |
| 94 | int hammer_count_io_locked; |
| 95 | int hammer_limit_dirtybufspace; /* per-mount */ |
| 96 | int hammer_limit_recs; /* as a whole XXX */ |
| 97 | int hammer_autoflush = 2000; /* auto flush */ |
| 98 | int hammer_bio_count; |
| 99 | int hammer_verify_zone; |
| 100 | int hammer_verify_data = 1; |
| 101 | int hammer_write_mode; |
| 102 | int64_t hammer_contention_count; |
| 103 | int64_t hammer_zone_limit; |
| 104 | |
| 105 | SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem"); |
| 106 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW, |
| 107 | &hammer_debug_general, 0, ""); |
| 108 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW, |
| 109 | &hammer_debug_io, 0, ""); |
| 110 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW, |
| 111 | &hammer_debug_debug, 0, ""); |
| 112 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW, |
| 113 | &hammer_debug_inode, 0, ""); |
| 114 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW, |
| 115 | &hammer_debug_locks, 0, ""); |
| 116 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW, |
| 117 | &hammer_debug_btree, 0, ""); |
| 118 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW, |
| 119 | &hammer_debug_tid, 0, ""); |
| 120 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW, |
| 121 | &hammer_debug_recover, 0, ""); |
| 122 | SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW, |
| 123 | &hammer_debug_recover_faults, 0, ""); |
| 124 | SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW, |
| 125 | &hammer_cluster_enable, 0, ""); |
| 126 | |
| 127 | SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW, |
| 128 | &hammer_limit_dirtybufspace, 0, ""); |
| 129 | SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW, |
| 130 | &hammer_limit_recs, 0, ""); |
| 131 | |
| 132 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD, |
| 133 | &hammer_count_fsyncs, 0, ""); |
| 134 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD, |
| 135 | &hammer_count_inodes, 0, ""); |
| 136 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD, |
| 137 | &hammer_count_iqueued, 0, ""); |
| 138 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaiming, CTLFLAG_RD, |
| 139 | &hammer_count_reclaiming, 0, ""); |
| 140 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD, |
| 141 | &hammer_count_records, 0, ""); |
| 142 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD, |
| 143 | &hammer_count_record_datas, 0, ""); |
| 144 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD, |
| 145 | &hammer_count_volumes, 0, ""); |
| 146 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD, |
| 147 | &hammer_count_buffers, 0, ""); |
| 148 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD, |
| 149 | &hammer_count_nodes, 0, ""); |
| 150 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD, |
| 151 | &hammer_count_extra_space_used, 0, ""); |
| 152 | |
| 153 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD, |
| 154 | &hammer_stats_btree_searches, 0, ""); |
| 155 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD, |
| 156 | &hammer_stats_btree_lookups, 0, ""); |
| 157 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD, |
| 158 | &hammer_stats_btree_inserts, 0, ""); |
| 159 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD, |
| 160 | &hammer_stats_btree_deletes, 0, ""); |
| 161 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD, |
| 162 | &hammer_stats_btree_elements, 0, ""); |
| 163 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD, |
| 164 | &hammer_stats_btree_splits, 0, ""); |
| 165 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD, |
| 166 | &hammer_stats_btree_iterations, 0, ""); |
| 167 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD, |
| 168 | &hammer_stats_btree_root_iterations, 0, ""); |
| 169 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD, |
| 170 | &hammer_stats_record_iterations, 0, ""); |
| 171 | |
| 172 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD, |
| 173 | &hammer_stats_file_read, 0, ""); |
| 174 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD, |
| 175 | &hammer_stats_file_write, 0, ""); |
| 176 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD, |
| 177 | &hammer_stats_file_iopsr, 0, ""); |
| 178 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD, |
| 179 | &hammer_stats_file_iopsw, 0, ""); |
| 180 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD, |
| 181 | &hammer_stats_disk_read, 0, ""); |
| 182 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD, |
| 183 | &hammer_stats_disk_write, 0, ""); |
| 184 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD, |
| 185 | &hammer_stats_inode_flushes, 0, ""); |
| 186 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD, |
| 187 | &hammer_stats_commits, 0, ""); |
| 188 | |
| 189 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD, |
| 190 | &hammer_count_dirtybufspace, 0, ""); |
| 191 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD, |
| 192 | &hammer_count_refedbufs, 0, ""); |
| 193 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD, |
| 194 | &hammer_count_reservations, 0, ""); |
| 195 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD, |
| 196 | &hammer_count_io_running_read, 0, ""); |
| 197 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD, |
| 198 | &hammer_count_io_locked, 0, ""); |
| 199 | SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD, |
| 200 | &hammer_count_io_running_write, 0, ""); |
| 201 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW, |
| 202 | &hammer_zone_limit, 0, ""); |
| 203 | SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW, |
| 204 | &hammer_contention_count, 0, ""); |
| 205 | SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW, |
| 206 | &hammer_autoflush, 0, ""); |
| 207 | SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW, |
| 208 | &hammer_verify_zone, 0, ""); |
| 209 | SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW, |
| 210 | &hammer_verify_data, 0, ""); |
| 211 | SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW, |
| 212 | &hammer_write_mode, 0, ""); |
| 213 | |
| 214 | KTR_INFO_MASTER(hammer); |
| 215 | |
| 216 | /* |
| 217 | * VFS ABI |
| 218 | */ |
| 219 | static void hammer_free_hmp(struct mount *mp); |
| 220 | |
| 221 | static int hammer_vfs_mount(struct mount *mp, char *path, caddr_t data, |
| 222 | struct ucred *cred); |
| 223 | static int hammer_vfs_unmount(struct mount *mp, int mntflags); |
| 224 | static int hammer_vfs_root(struct mount *mp, struct vnode **vpp); |
| 225 | static int hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, |
| 226 | struct ucred *cred); |
| 227 | static int hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, |
| 228 | struct ucred *cred); |
| 229 | static int hammer_vfs_sync(struct mount *mp, int waitfor); |
| 230 | static int hammer_vfs_vget(struct mount *mp, ino_t ino, |
| 231 | struct vnode **vpp); |
| 232 | static int hammer_vfs_init(struct vfsconf *conf); |
| 233 | static int hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, |
| 234 | struct fid *fhp, struct vnode **vpp); |
| 235 | static int hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp); |
| 236 | static int hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, |
| 237 | int *exflagsp, struct ucred **credanonp); |
| 238 | |
| 239 | |
| 240 | static struct vfsops hammer_vfsops = { |
| 241 | .vfs_mount = hammer_vfs_mount, |
| 242 | .vfs_unmount = hammer_vfs_unmount, |
| 243 | .vfs_root = hammer_vfs_root, |
| 244 | .vfs_statfs = hammer_vfs_statfs, |
| 245 | .vfs_statvfs = hammer_vfs_statvfs, |
| 246 | .vfs_sync = hammer_vfs_sync, |
| 247 | .vfs_vget = hammer_vfs_vget, |
| 248 | .vfs_init = hammer_vfs_init, |
| 249 | .vfs_vptofh = hammer_vfs_vptofh, |
| 250 | .vfs_fhtovp = hammer_vfs_fhtovp, |
| 251 | .vfs_checkexp = hammer_vfs_checkexp |
| 252 | }; |
| 253 | |
| 254 | MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", ""); |
| 255 | |
| 256 | VFS_SET(hammer_vfsops, hammer, 0); |
| 257 | MODULE_VERSION(hammer, 1); |
| 258 | |
| 259 | static int |
| 260 | hammer_vfs_init(struct vfsconf *conf) |
| 261 | { |
| 262 | int n; |
| 263 | |
| 264 | if (hammer_limit_recs == 0) { |
| 265 | hammer_limit_recs = nbuf * 25; |
| 266 | n = kmalloc_limit(M_HAMMER) / 512; |
| 267 | if (hammer_limit_recs > n) |
| 268 | hammer_limit_recs = n; |
| 269 | } |
| 270 | if (hammer_limit_dirtybufspace == 0) { |
| 271 | hammer_limit_dirtybufspace = hidirtybufspace / 2; |
| 272 | if (hammer_limit_dirtybufspace < 100) |
| 273 | hammer_limit_dirtybufspace = 100; |
| 274 | } |
| 275 | return(0); |
| 276 | } |
| 277 | |
| 278 | static int |
| 279 | hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data, |
| 280 | struct ucred *cred) |
| 281 | { |
| 282 | struct hammer_mount_info info; |
| 283 | hammer_mount_t hmp; |
| 284 | hammer_volume_t rootvol; |
| 285 | struct vnode *rootvp; |
| 286 | struct vnode *devvp = NULL; |
| 287 | const char *upath; /* volume name in userspace */ |
| 288 | char *path; /* volume name in system space */ |
| 289 | int error; |
| 290 | int i; |
| 291 | int master_id; |
| 292 | int maxinodes; |
| 293 | |
| 294 | /* |
| 295 | * Accept hammer_mount_info. mntpt is NULL for root mounts at boot. |
| 296 | */ |
| 297 | if (mntpt == NULL) { |
| 298 | if ((error = bdevvp(rootdev, &devvp))) { |
| 299 | kprintf("hammer_mountroot: can't find devvp\n"); |
| 300 | return (error); |
| 301 | } |
| 302 | mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */ |
| 303 | bzero(&info, sizeof(info)); |
| 304 | info.asof = 0; |
| 305 | info.hflags = 0; |
| 306 | info.nvolumes = 1; |
| 307 | } else { |
| 308 | if ((error = copyin(data, &info, sizeof(info))) != 0) |
| 309 | return (error); |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * updating or new mount |
| 314 | */ |
| 315 | if (mp->mnt_flag & MNT_UPDATE) { |
| 316 | hmp = (void *)mp->mnt_data; |
| 317 | KKASSERT(hmp != NULL); |
| 318 | } else { |
| 319 | if (info.nvolumes <= 0 || info.nvolumes >= 32768) |
| 320 | return (EINVAL); |
| 321 | hmp = NULL; |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * master-id validation. The master id may not be changed by a |
| 326 | * mount update. |
| 327 | */ |
| 328 | if (info.hflags & HMNT_MASTERID) { |
| 329 | if (hmp && hmp->master_id != info.master_id) { |
| 330 | kprintf("hammer: cannot change master id " |
| 331 | "with mount update\n"); |
| 332 | return(EINVAL); |
| 333 | } |
| 334 | master_id = info.master_id; |
| 335 | if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS) |
| 336 | return (EINVAL); |
| 337 | } else { |
| 338 | if (hmp) |
| 339 | master_id = hmp->master_id; |
| 340 | else |
| 341 | master_id = 0; |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Interal mount data structure |
| 346 | */ |
| 347 | if (hmp == NULL) { |
| 348 | hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO); |
| 349 | mp->mnt_data = (qaddr_t)hmp; |
| 350 | hmp->mp = mp; |
| 351 | /*TAILQ_INIT(&hmp->recycle_list);*/ |
| 352 | |
| 353 | /* |
| 354 | * Make sure kmalloc type limits are set appropriately. If root |
| 355 | * increases the vnode limit you may have to do a dummy remount |
| 356 | * to adjust the HAMMER inode limit. |
| 357 | */ |
| 358 | kmalloc_create(&hmp->m_misc, "HAMMER-others"); |
| 359 | kmalloc_create(&hmp->m_inodes, "HAMMER-inodes"); |
| 360 | |
| 361 | maxinodes = desiredvnodes + desiredvnodes / 5 + |
| 362 | HAMMER_RECLAIM_WAIT; |
| 363 | kmalloc_raise_limit(hmp->m_inodes, |
| 364 | maxinodes * sizeof(struct hammer_inode)); |
| 365 | |
| 366 | hmp->root_btree_beg.localization = 0x00000000U; |
| 367 | hmp->root_btree_beg.obj_id = -0x8000000000000000LL; |
| 368 | hmp->root_btree_beg.key = -0x8000000000000000LL; |
| 369 | hmp->root_btree_beg.create_tid = 1; |
| 370 | hmp->root_btree_beg.delete_tid = 1; |
| 371 | hmp->root_btree_beg.rec_type = 0; |
| 372 | hmp->root_btree_beg.obj_type = 0; |
| 373 | |
| 374 | hmp->root_btree_end.localization = 0xFFFFFFFFU; |
| 375 | hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL; |
| 376 | hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL; |
| 377 | hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL; |
| 378 | hmp->root_btree_end.delete_tid = 0; /* special case */ |
| 379 | hmp->root_btree_end.rec_type = 0xFFFFU; |
| 380 | hmp->root_btree_end.obj_type = 0; |
| 381 | |
| 382 | hmp->krate.freq = 1; /* maximum reporting rate (hz) */ |
| 383 | hmp->krate.count = -16; /* initial burst */ |
| 384 | |
| 385 | hmp->sync_lock.refs = 1; |
| 386 | hmp->free_lock.refs = 1; |
| 387 | hmp->undo_lock.refs = 1; |
| 388 | hmp->blkmap_lock.refs = 1; |
| 389 | |
| 390 | TAILQ_INIT(&hmp->delay_list); |
| 391 | TAILQ_INIT(&hmp->flush_group_list); |
| 392 | TAILQ_INIT(&hmp->objid_cache_list); |
| 393 | TAILQ_INIT(&hmp->undo_lru_list); |
| 394 | TAILQ_INIT(&hmp->reclaim_list); |
| 395 | } |
| 396 | hmp->hflags &= ~HMNT_USERFLAGS; |
| 397 | hmp->hflags |= info.hflags & HMNT_USERFLAGS; |
| 398 | |
| 399 | hmp->master_id = master_id; |
| 400 | |
| 401 | if (info.asof) { |
| 402 | mp->mnt_flag |= MNT_RDONLY; |
| 403 | hmp->asof = info.asof; |
| 404 | } else { |
| 405 | hmp->asof = HAMMER_MAX_TID; |
| 406 | } |
| 407 | |
| 408 | /* |
| 409 | * Re-open read-write if originally read-only, or vise-versa. |
| 410 | */ |
| 411 | if (mp->mnt_flag & MNT_UPDATE) { |
| 412 | error = 0; |
| 413 | if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) { |
| 414 | kprintf("HAMMER read-only -> read-write\n"); |
| 415 | hmp->ronly = 0; |
| 416 | RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, |
| 417 | hammer_adjust_volume_mode, NULL); |
| 418 | rootvol = hammer_get_root_volume(hmp, &error); |
| 419 | if (rootvol) { |
| 420 | hammer_recover_flush_buffers(hmp, rootvol, 1); |
| 421 | bcopy(rootvol->ondisk->vol0_blockmap, |
| 422 | hmp->blockmap, |
| 423 | sizeof(hmp->blockmap)); |
| 424 | hammer_rel_volume(rootvol, 0); |
| 425 | } |
| 426 | RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, |
| 427 | hammer_reload_inode, NULL); |
| 428 | /* kernel clears MNT_RDONLY */ |
| 429 | } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) { |
| 430 | kprintf("HAMMER read-write -> read-only\n"); |
| 431 | hmp->ronly = 1; /* messy */ |
| 432 | RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, |
| 433 | hammer_reload_inode, NULL); |
| 434 | hmp->ronly = 0; |
| 435 | hammer_flusher_sync(hmp); |
| 436 | hammer_flusher_sync(hmp); |
| 437 | hammer_flusher_sync(hmp); |
| 438 | hmp->ronly = 1; |
| 439 | RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, |
| 440 | hammer_adjust_volume_mode, NULL); |
| 441 | } |
| 442 | return(error); |
| 443 | } |
| 444 | |
| 445 | RB_INIT(&hmp->rb_vols_root); |
| 446 | RB_INIT(&hmp->rb_inos_root); |
| 447 | RB_INIT(&hmp->rb_nods_root); |
| 448 | RB_INIT(&hmp->rb_undo_root); |
| 449 | RB_INIT(&hmp->rb_resv_root); |
| 450 | RB_INIT(&hmp->rb_bufs_root); |
| 451 | RB_INIT(&hmp->rb_pfsm_root); |
| 452 | |
| 453 | hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0); |
| 454 | |
| 455 | TAILQ_INIT(&hmp->volu_list); |
| 456 | TAILQ_INIT(&hmp->undo_list); |
| 457 | TAILQ_INIT(&hmp->data_list); |
| 458 | TAILQ_INIT(&hmp->meta_list); |
| 459 | TAILQ_INIT(&hmp->lose_list); |
| 460 | |
| 461 | /* |
| 462 | * Load volumes |
| 463 | */ |
| 464 | path = objcache_get(namei_oc, M_WAITOK); |
| 465 | hmp->nvolumes = -1; |
| 466 | for (i = 0; i < info.nvolumes; ++i) { |
| 467 | if (mntpt == NULL) { |
| 468 | /* |
| 469 | * Root mount. |
| 470 | * Only one volume; and no need for copyin. |
| 471 | */ |
| 472 | KKASSERT(info.nvolumes == 1); |
| 473 | ksnprintf(path, MAXPATHLEN, "/dev/%s", |
| 474 | mp->mnt_stat.f_mntfromname); |
| 475 | error = 0; |
| 476 | } else { |
| 477 | error = copyin(&info.volumes[i], &upath, |
| 478 | sizeof(char *)); |
| 479 | if (error == 0) |
| 480 | error = copyinstr(upath, path, |
| 481 | MAXPATHLEN, NULL); |
| 482 | } |
| 483 | if (error == 0) |
| 484 | error = hammer_install_volume(hmp, path, devvp); |
| 485 | if (error) |
| 486 | break; |
| 487 | } |
| 488 | objcache_put(namei_oc, path); |
| 489 | |
| 490 | /* |
| 491 | * Make sure we found a root volume |
| 492 | */ |
| 493 | if (error == 0 && hmp->rootvol == NULL) { |
| 494 | kprintf("hammer_mount: No root volume found!\n"); |
| 495 | error = EINVAL; |
| 496 | } |
| 497 | |
| 498 | /* |
| 499 | * Check that all required volumes are available |
| 500 | */ |
| 501 | if (error == 0 && hammer_mountcheck_volumes(hmp)) { |
| 502 | kprintf("hammer_mount: Missing volumes, cannot mount!\n"); |
| 503 | error = EINVAL; |
| 504 | } |
| 505 | |
| 506 | if (error) { |
| 507 | hammer_free_hmp(mp); |
| 508 | return (error); |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * No errors, setup enough of the mount point so we can lookup the |
| 513 | * root vnode. |
| 514 | */ |
| 515 | mp->mnt_iosize_max = MAXPHYS; |
| 516 | mp->mnt_kern_flag |= MNTK_FSMID; |
| 517 | |
| 518 | /* |
| 519 | * note: f_iosize is used by vnode_pager_haspage() when constructing |
| 520 | * its VOP_BMAP call. |
| 521 | */ |
| 522 | mp->mnt_stat.f_iosize = HAMMER_BUFSIZE; |
| 523 | mp->mnt_stat.f_bsize = HAMMER_BUFSIZE; |
| 524 | |
| 525 | mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE; |
| 526 | mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE; |
| 527 | |
| 528 | mp->mnt_maxsymlinklen = 255; |
| 529 | mp->mnt_flag |= MNT_LOCAL; |
| 530 | |
| 531 | vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops); |
| 532 | vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops); |
| 533 | vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops); |
| 534 | |
| 535 | /* |
| 536 | * The root volume's ondisk pointer is only valid if we hold a |
| 537 | * reference to it. |
| 538 | */ |
| 539 | rootvol = hammer_get_root_volume(hmp, &error); |
| 540 | if (error) |
| 541 | goto failed; |
| 542 | |
| 543 | /* |
| 544 | * Perform any necessary UNDO operations. The recovery code does |
| 545 | * call hammer_undo_lookup() so we have to pre-cache the blockmap, |
| 546 | * and then re-copy it again after recovery is complete. |
| 547 | * |
| 548 | * If this is a read-only mount the UNDO information is retained |
| 549 | * in memory in the form of dirty buffer cache buffers, and not |
| 550 | * written back to the media. |
| 551 | */ |
| 552 | bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, |
| 553 | sizeof(hmp->blockmap)); |
| 554 | |
| 555 | /* |
| 556 | * Check filesystem version |
| 557 | */ |
| 558 | hmp->version = rootvol->ondisk->vol_version; |
| 559 | if (hmp->version < HAMMER_VOL_VERSION_MIN || |
| 560 | hmp->version > HAMMER_VOL_VERSION_MAX) { |
| 561 | kprintf("HAMMER: mount unsupported fs version %d\n", |
| 562 | hmp->version); |
| 563 | error = ERANGE; |
| 564 | goto done; |
| 565 | } |
| 566 | |
| 567 | /* |
| 568 | * The undo_rec_limit limits the size of flush groups to avoid |
| 569 | * blowing out the UNDO FIFO. This calculation is typically in |
| 570 | * the tens of thousands and is designed primarily when small |
| 571 | * HAMMER filesystems are created. |
| 572 | */ |
| 573 | hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100; |
| 574 | if (hammer_debug_general & 0x0001) |
| 575 | kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit); |
| 576 | |
| 577 | error = hammer_recover(hmp, rootvol); |
| 578 | if (error) { |
| 579 | kprintf("Failed to recover HAMMER filesystem on mount\n"); |
| 580 | goto done; |
| 581 | } |
| 582 | |
| 583 | /* |
| 584 | * Finish setup now that we have a good root volume. |
| 585 | * |
| 586 | * The top 16 bits of fsid.val[1] is a pfs id. |
| 587 | */ |
| 588 | ksnprintf(mp->mnt_stat.f_mntfromname, |
| 589 | sizeof(mp->mnt_stat.f_mntfromname), "%s", |
| 590 | rootvol->ondisk->vol_name); |
| 591 | mp->mnt_stat.f_fsid.val[0] = |
| 592 | crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8); |
| 593 | mp->mnt_stat.f_fsid.val[1] = |
| 594 | crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8); |
| 595 | mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF; |
| 596 | |
| 597 | mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid; |
| 598 | mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid, |
| 599 | sizeof(mp->mnt_vstat.f_fsid_uuid)); |
| 600 | |
| 601 | /* |
| 602 | * Certain often-modified fields in the root volume are cached in |
| 603 | * the hammer_mount structure so we do not have to generate lots |
| 604 | * of little UNDO structures for them. |
| 605 | * |
| 606 | * Recopy after recovery. This also has the side effect of |
| 607 | * setting our cached undo FIFO's first_offset, which serves to |
| 608 | * placemark the FIFO start for the NEXT flush cycle while the |
| 609 | * on-disk first_offset represents the LAST flush cycle. |
| 610 | */ |
| 611 | hmp->next_tid = rootvol->ondisk->vol0_next_tid; |
| 612 | hmp->flush_tid1 = hmp->next_tid; |
| 613 | hmp->flush_tid2 = hmp->next_tid; |
| 614 | bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap, |
| 615 | sizeof(hmp->blockmap)); |
| 616 | hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks; |
| 617 | |
| 618 | hammer_flusher_create(hmp); |
| 619 | |
| 620 | /* |
| 621 | * Locate the root directory using the root cluster's B-Tree as a |
| 622 | * starting point. The root directory uses an obj_id of 1. |
| 623 | * |
| 624 | * FUTURE: Leave the root directory cached referenced but unlocked |
| 625 | * in hmp->rootvp (need to flush it on unmount). |
| 626 | */ |
| 627 | error = hammer_vfs_vget(mp, 1, &rootvp); |
| 628 | if (error) |
| 629 | goto done; |
| 630 | vput(rootvp); |
| 631 | /*vn_unlock(hmp->rootvp);*/ |
| 632 | |
| 633 | done: |
| 634 | hammer_rel_volume(rootvol, 0); |
| 635 | failed: |
| 636 | /* |
| 637 | * Cleanup and return. |
| 638 | */ |
| 639 | if (error) |
| 640 | hammer_free_hmp(mp); |
| 641 | return (error); |
| 642 | } |
| 643 | |
| 644 | static int |
| 645 | hammer_vfs_unmount(struct mount *mp, int mntflags) |
| 646 | { |
| 647 | #if 0 |
| 648 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 649 | #endif |
| 650 | int flags; |
| 651 | int error; |
| 652 | |
| 653 | /* |
| 654 | * Clean out the vnodes |
| 655 | */ |
| 656 | flags = 0; |
| 657 | if (mntflags & MNT_FORCE) |
| 658 | flags |= FORCECLOSE; |
| 659 | if ((error = vflush(mp, 0, flags)) != 0) |
| 660 | return (error); |
| 661 | |
| 662 | /* |
| 663 | * Clean up the internal mount structure and related entities. This |
| 664 | * may issue I/O. |
| 665 | */ |
| 666 | hammer_free_hmp(mp); |
| 667 | return(0); |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Clean up the internal mount structure and disassociate it from the mount. |
| 672 | * This may issue I/O. |
| 673 | */ |
| 674 | static void |
| 675 | hammer_free_hmp(struct mount *mp) |
| 676 | { |
| 677 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 678 | hammer_flush_group_t flg; |
| 679 | int count; |
| 680 | int dummy; |
| 681 | |
| 682 | /* |
| 683 | * Flush anything dirty. This won't even run if the |
| 684 | * filesystem errored-out. |
| 685 | */ |
| 686 | count = 0; |
| 687 | while (hammer_flusher_haswork(hmp)) { |
| 688 | hammer_flusher_sync(hmp); |
| 689 | ++count; |
| 690 | if (count >= 5) { |
| 691 | if (count == 5) |
| 692 | kprintf("HAMMER: umount flushing."); |
| 693 | else |
| 694 | kprintf("."); |
| 695 | tsleep(&dummy, 0, "hmrufl", hz); |
| 696 | } |
| 697 | if (count == 30) { |
| 698 | kprintf("giving up\n"); |
| 699 | break; |
| 700 | } |
| 701 | } |
| 702 | if (count >= 5 && count < 30) |
| 703 | kprintf("\n"); |
| 704 | |
| 705 | /* |
| 706 | * If the mount had a critical error we have to destroy any |
| 707 | * remaining inodes before we can finish cleaning up the flusher. |
| 708 | */ |
| 709 | if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) { |
| 710 | RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL, |
| 711 | hammer_destroy_inode_callback, NULL); |
| 712 | } |
| 713 | |
| 714 | /* |
| 715 | * There shouldn't be any inodes left now and any left over |
| 716 | * flush groups should now be empty. |
| 717 | */ |
| 718 | KKASSERT(RB_EMPTY(&hmp->rb_inos_root)); |
| 719 | while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) { |
| 720 | TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry); |
| 721 | KKASSERT(TAILQ_EMPTY(&flg->flush_list)); |
| 722 | if (flg->refs) { |
| 723 | kprintf("HAMMER: Warning, flush_group %p was " |
| 724 | "not empty on umount!\n", flg); |
| 725 | } |
| 726 | kfree(flg, hmp->m_misc); |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * We can finally destroy the flusher |
| 731 | */ |
| 732 | hammer_flusher_destroy(hmp); |
| 733 | |
| 734 | /* |
| 735 | * We may have held recovered buffers due to a read-only mount. |
| 736 | * These must be discarded. |
| 737 | */ |
| 738 | if (hmp->ronly) |
| 739 | hammer_recover_flush_buffers(hmp, NULL, -1); |
| 740 | |
| 741 | /* |
| 742 | * Unload buffers and then volumes |
| 743 | */ |
| 744 | RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL, |
| 745 | hammer_unload_buffer, NULL); |
| 746 | RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL, |
| 747 | hammer_unload_volume, NULL); |
| 748 | |
| 749 | mp->mnt_data = NULL; |
| 750 | mp->mnt_flag &= ~MNT_LOCAL; |
| 751 | hmp->mp = NULL; |
| 752 | hammer_destroy_objid_cache(hmp); |
| 753 | kmalloc_destroy(&hmp->m_misc); |
| 754 | kmalloc_destroy(&hmp->m_inodes); |
| 755 | kfree(hmp, M_HAMMER); |
| 756 | } |
| 757 | |
| 758 | /* |
| 759 | * Report critical errors. ip may be NULL. |
| 760 | */ |
| 761 | void |
| 762 | hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip, |
| 763 | int error, const char *msg) |
| 764 | { |
| 765 | hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR; |
| 766 | krateprintf(&hmp->krate, |
| 767 | "HAMMER(%s): Critical error inode=%lld %s\n", |
| 768 | hmp->mp->mnt_stat.f_mntfromname, |
| 769 | (long long)(ip ? ip->obj_id : -1), msg); |
| 770 | if (hmp->ronly == 0) { |
| 771 | hmp->ronly = 2; /* special errored read-only mode */ |
| 772 | hmp->mp->mnt_flag |= MNT_RDONLY; |
| 773 | kprintf("HAMMER(%s): Forcing read-only mode\n", |
| 774 | hmp->mp->mnt_stat.f_mntfromname); |
| 775 | } |
| 776 | hmp->error = error; |
| 777 | } |
| 778 | |
| 779 | |
| 780 | /* |
| 781 | * Obtain a vnode for the specified inode number. An exclusively locked |
| 782 | * vnode is returned. |
| 783 | */ |
| 784 | int |
| 785 | hammer_vfs_vget(struct mount *mp, ino_t ino, struct vnode **vpp) |
| 786 | { |
| 787 | struct hammer_transaction trans; |
| 788 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 789 | struct hammer_inode *ip; |
| 790 | int error; |
| 791 | |
| 792 | hammer_simple_transaction(&trans, hmp); |
| 793 | |
| 794 | /* |
| 795 | * Lookup the requested HAMMER inode. The structure must be |
| 796 | * left unlocked while we manipulate the related vnode to avoid |
| 797 | * a deadlock. |
| 798 | */ |
| 799 | ip = hammer_get_inode(&trans, NULL, ino, |
| 800 | hmp->asof, HAMMER_DEF_LOCALIZATION, |
| 801 | 0, &error); |
| 802 | if (ip == NULL) { |
| 803 | *vpp = NULL; |
| 804 | hammer_done_transaction(&trans); |
| 805 | return(error); |
| 806 | } |
| 807 | error = hammer_get_vnode(ip, vpp); |
| 808 | hammer_rel_inode(ip, 0); |
| 809 | hammer_done_transaction(&trans); |
| 810 | return (error); |
| 811 | } |
| 812 | |
| 813 | /* |
| 814 | * Return the root vnode for the filesystem. |
| 815 | * |
| 816 | * HAMMER stores the root vnode in the hammer_mount structure so |
| 817 | * getting it is easy. |
| 818 | */ |
| 819 | static int |
| 820 | hammer_vfs_root(struct mount *mp, struct vnode **vpp) |
| 821 | { |
| 822 | #if 0 |
| 823 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 824 | #endif |
| 825 | int error; |
| 826 | |
| 827 | error = hammer_vfs_vget(mp, 1, vpp); |
| 828 | return (error); |
| 829 | } |
| 830 | |
| 831 | static int |
| 832 | hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) |
| 833 | { |
| 834 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 835 | hammer_volume_t volume; |
| 836 | hammer_volume_ondisk_t ondisk; |
| 837 | int error; |
| 838 | int64_t bfree; |
| 839 | |
| 840 | volume = hammer_get_root_volume(hmp, &error); |
| 841 | if (error) |
| 842 | return(error); |
| 843 | ondisk = volume->ondisk; |
| 844 | |
| 845 | /* |
| 846 | * Basic stats |
| 847 | */ |
| 848 | mp->mnt_stat.f_files = ondisk->vol0_stat_inodes; |
| 849 | bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; |
| 850 | hammer_rel_volume(volume, 0); |
| 851 | |
| 852 | mp->mnt_stat.f_bfree = bfree / HAMMER_BUFSIZE; |
| 853 | mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree; |
| 854 | if (mp->mnt_stat.f_files < 0) |
| 855 | mp->mnt_stat.f_files = 0; |
| 856 | |
| 857 | *sbp = mp->mnt_stat; |
| 858 | return(0); |
| 859 | } |
| 860 | |
| 861 | static int |
| 862 | hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred) |
| 863 | { |
| 864 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 865 | hammer_volume_t volume; |
| 866 | hammer_volume_ondisk_t ondisk; |
| 867 | int error; |
| 868 | int64_t bfree; |
| 869 | int64_t breserved; |
| 870 | |
| 871 | volume = hammer_get_root_volume(hmp, &error); |
| 872 | if (error) |
| 873 | return(error); |
| 874 | ondisk = volume->ondisk; |
| 875 | |
| 876 | /* |
| 877 | * Basic stats |
| 878 | */ |
| 879 | _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved); |
| 880 | mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes; |
| 881 | bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE; |
| 882 | hammer_rel_volume(volume, 0); |
| 883 | |
| 884 | mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE; |
| 885 | mp->mnt_vstat.f_bavail = mp->mnt_stat.f_bfree; |
| 886 | if (mp->mnt_vstat.f_files < 0) |
| 887 | mp->mnt_vstat.f_files = 0; |
| 888 | *sbp = mp->mnt_vstat; |
| 889 | return(0); |
| 890 | } |
| 891 | |
| 892 | /* |
| 893 | * Sync the filesystem. Currently we have to run it twice, the second |
| 894 | * one will advance the undo start index to the end index, so if a crash |
| 895 | * occurs no undos will be run on mount. |
| 896 | * |
| 897 | * We do not sync the filesystem if we are called from a panic. If we did |
| 898 | * we might end up blowing up a sync that was already in progress. |
| 899 | */ |
| 900 | static int |
| 901 | hammer_vfs_sync(struct mount *mp, int waitfor) |
| 902 | { |
| 903 | struct hammer_mount *hmp = (void *)mp->mnt_data; |
| 904 | int error; |
| 905 | |
| 906 | if (panicstr == NULL) { |
| 907 | error = hammer_sync_hmp(hmp, waitfor); |
| 908 | } else { |
| 909 | error = EIO; |
| 910 | } |
| 911 | return (error); |
| 912 | } |
| 913 | |
| 914 | /* |
| 915 | * Convert a vnode to a file handle. |
| 916 | */ |
| 917 | static int |
| 918 | hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp) |
| 919 | { |
| 920 | hammer_inode_t ip; |
| 921 | |
| 922 | KKASSERT(MAXFIDSZ >= 16); |
| 923 | ip = VTOI(vp); |
| 924 | fhp->fid_len = offsetof(struct fid, fid_data[16]); |
| 925 | fhp->fid_ext = ip->obj_localization >> 16; |
| 926 | bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id)); |
| 927 | bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof)); |
| 928 | return(0); |
| 929 | } |
| 930 | |
| 931 | |
| 932 | /* |
| 933 | * Convert a file handle back to a vnode. |
| 934 | * |
| 935 | * Use rootvp to enforce PFS isolation when a PFS is exported via a |
| 936 | * null mount. |
| 937 | */ |
| 938 | static int |
| 939 | hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp, |
| 940 | struct fid *fhp, struct vnode **vpp) |
| 941 | { |
| 942 | struct hammer_transaction trans; |
| 943 | struct hammer_inode *ip; |
| 944 | struct hammer_inode_info info; |
| 945 | int error; |
| 946 | u_int32_t localization; |
| 947 | |
| 948 | bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id)); |
| 949 | bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof)); |
| 950 | if (rootvp) |
| 951 | localization = VTOI(rootvp)->obj_localization; |
| 952 | else |
| 953 | localization = (u_int32_t)fhp->fid_ext << 16; |
| 954 | |
| 955 | hammer_simple_transaction(&trans, (void *)mp->mnt_data); |
| 956 | |
| 957 | /* |
| 958 | * Get/allocate the hammer_inode structure. The structure must be |
| 959 | * unlocked while we manipulate the related vnode to avoid a |
| 960 | * deadlock. |
| 961 | */ |
| 962 | ip = hammer_get_inode(&trans, NULL, info.obj_id, |
| 963 | info.obj_asof, localization, 0, &error); |
| 964 | if (ip == NULL) { |
| 965 | *vpp = NULL; |
| 966 | return(error); |
| 967 | } |
| 968 | error = hammer_get_vnode(ip, vpp); |
| 969 | hammer_rel_inode(ip, 0); |
| 970 | hammer_done_transaction(&trans); |
| 971 | return (error); |
| 972 | } |
| 973 | |
| 974 | static int |
| 975 | hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam, |
| 976 | int *exflagsp, struct ucred **credanonp) |
| 977 | { |
| 978 | hammer_mount_t hmp = (void *)mp->mnt_data; |
| 979 | struct netcred *np; |
| 980 | int error; |
| 981 | |
| 982 | np = vfs_export_lookup(mp, &hmp->export, nam); |
| 983 | if (np) { |
| 984 | *exflagsp = np->netc_exflags; |
| 985 | *credanonp = &np->netc_anon; |
| 986 | error = 0; |
| 987 | } else { |
| 988 | error = EACCES; |
| 989 | } |
| 990 | return (error); |
| 991 | |
| 992 | } |
| 993 | |
| 994 | int |
| 995 | hammer_vfs_export(struct mount *mp, int op, const struct export_args *export) |
| 996 | { |
| 997 | hammer_mount_t hmp = (void *)mp->mnt_data; |
| 998 | int error; |
| 999 | |
| 1000 | switch(op) { |
| 1001 | case MOUNTCTL_SET_EXPORT: |
| 1002 | error = vfs_export(mp, &hmp->export, export); |
| 1003 | break; |
| 1004 | default: |
| 1005 | error = EOPNOTSUPP; |
| 1006 | break; |
| 1007 | } |
| 1008 | return(error); |
| 1009 | } |
| 1010 | |