sys/vfs/hammer/hammer_vfsops.c

   1 /*
   2  * Copyright (c) 2007 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 1.13 2008/01/01 01:00:03 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_btree;
  51 int hammer_debug_tid;
  52 int hammer_count_inodes;
  53 int hammer_count_records;
  54 int hammer_count_record_datas;
  55 int hammer_count_volumes;
  56 int hammer_count_supercls;
  57 int hammer_count_clusters;
  58 int hammer_count_buffers;
  59 int hammer_count_nodes;
  60 int hammer_count_spikes;
  61
  62 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
  63 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
  64            &hammer_debug_btree, 0, "");
  65 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
  66            &hammer_debug_tid, 0, "");
  67 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
  68            &hammer_count_inodes, 0, "");
  69 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
  70            &hammer_count_records, 0, "");
  71 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
  72            &hammer_count_record_datas, 0, "");
  73 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
  74            &hammer_count_volumes, 0, "");
  75 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_supercls, CTLFLAG_RD,
  76            &hammer_count_supercls, 0, "");
  77 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_clusters, CTLFLAG_RD,
  78            &hammer_count_clusters, 0, "");
  79 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
  80            &hammer_count_buffers, 0, "");
  81 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
  82            &hammer_count_nodes, 0, "");
  83 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_spikes, CTLFLAG_RD,
  84            &hammer_count_spikes, 0, "");
  85
  86 /*
  87  * VFS ABI
  88  */
  89 static void     hammer_free_hmp(struct mount *mp);
  90
  91 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
  92                                 struct ucred *cred);
  93 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
  94 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
  95 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
  96                                 struct ucred *cred);
  97 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
  98 static int      hammer_vfs_init(struct vfsconf *conf);
  99
 100 static struct vfsops hammer_vfsops = {
 101         .vfs_mount      = hammer_vfs_mount,
 102         .vfs_unmount    = hammer_vfs_unmount,
 103         .vfs_root       = hammer_vfs_root,
 104         .vfs_statfs     = hammer_vfs_statfs,
 105         .vfs_sync       = hammer_vfs_sync,
 106         .vfs_vget       = hammer_vfs_vget,
 107         .vfs_init       = hammer_vfs_init
 108 };
 109
 110 MALLOC_DEFINE(M_HAMMER, "hammer-mount", "hammer mount");
 111
 112 VFS_SET(hammer_vfsops, hammer, 0);
 113 MODULE_VERSION(hammer, 1);
 114
 115 static int
 116 hammer_vfs_init(struct vfsconf *conf)
 117 {
 118         hammer_init_alist_config();
 119         return(0);
 120 }
 121
 122 static int
 123 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
 124                  struct ucred *cred)
 125 {
 126         struct hammer_mount_info info;
 127         hammer_mount_t hmp;
 128         hammer_volume_t rootvol;
 129         struct vnode *rootvp;
 130         const char *upath;      /* volume name in userspace */
 131         char *path;             /* volume name in system space */
 132         int error;
 133         int i;
 134
 135         if ((error = copyin(data, &info, sizeof(info))) != 0)
 136                 return (error);
 137         if (info.nvolumes <= 0 || info.nvolumes >= 32768)
 138                 return (EINVAL);
 139
 140         /*
 141          * Interal mount data structure
 142          */
 143         if (mp->mnt_flag & MNT_UPDATE) {
 144                 hmp = (void *)mp->mnt_data;
 145                 KKASSERT(hmp != NULL);
 146         } else {
 147                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
 148                 mp->mnt_data = (qaddr_t)hmp;
 149                 hmp->mp = mp;
 150                 hmp->zbuf = kmalloc(HAMMER_BUFSIZE, M_HAMMER, M_WAITOK|M_ZERO);
 151                 hmp->namekey_iterator = mycpu->gd_time_seconds;
 152         }
 153         hmp->hflags = info.hflags;
 154         if (info.asof) {
 155                 mp->mnt_flag |= MNT_RDONLY;
 156                 hmp->asof = info.asof;
 157         } else {
 158                 hmp->asof = HAMMER_MAX_TID;
 159         }
 160
 161         /*
 162          * Re-open read-write if originally read-only, or vise-versa XXX
 163          */
 164         if (mp->mnt_flag & MNT_UPDATE) {
 165                 if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
 166                         kprintf("HAMMER read-write -> read-only XXX\n");
 167                         hmp->ronly = 1;
 168                 } else if (hmp->ronly && (mp->mnt_flag & MNT_RDONLY) == 0) {
 169                         kprintf("HAMMER read-only -> read-write XXX\n");
 170                         hmp->ronly = 0;
 171                 }
 172                 return(0);
 173         }
 174
 175         RB_INIT(&hmp->rb_vols_root);
 176         RB_INIT(&hmp->rb_inos_root);
 177         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
 178
 179         /*
 180          * Load volumes
 181          */
 182         path = objcache_get(namei_oc, M_WAITOK);
 183         hmp->nvolumes = info.nvolumes;
 184         for (i = 0; i < info.nvolumes; ++i) {
 185                 error = copyin(&info.volumes[i], &upath, sizeof(char *));
 186                 if (error == 0)
 187                         error = copyinstr(upath, path, MAXPATHLEN, NULL);
 188                 if (error == 0)
 189                         error = hammer_install_volume(hmp, path);
 190                 if (error)
 191                         break;
 192         }
 193         objcache_put(namei_oc, path);
 194
 195         /*
 196          * Make sure we found a root volume
 197          */
 198         if (error == 0 && hmp->rootvol == NULL) {
 199                 kprintf("hammer_mount: No root volume found!\n");
 200                 error = EINVAL;
 201         }
 202         if (error == 0 && hmp->rootcl == NULL) {
 203                 kprintf("hammer_mount: No root cluster found!\n");
 204                 error = EINVAL;
 205         }
 206         if (error) {
 207                 hammer_free_hmp(mp);
 208                 return (error);
 209         }
 210
 211         /*
 212          * No errors, setup enough of the mount point so we can lookup the
 213          * root vnode.
 214          */
 215         mp->mnt_iosize_max = MAXPHYS;
 216         mp->mnt_kern_flag |= MNTK_FSMID;
 217         mp->mnt_stat.f_fsid.val[0] = 0; /* XXX */
 218         mp->mnt_stat.f_fsid.val[1] = 0; /* XXX */
 219
 220         /*
 221          * note: f_iosize is used by vnode_pager_haspage() when constructing
 222          * its VOP_BMAP call.
 223          */
 224         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
 225         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
 226         vfs_getnewfsid(mp);             /* XXX */
 227         mp->mnt_maxsymlinklen = 255;
 228         mp->mnt_flag |= MNT_LOCAL;
 229
 230         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
 231         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
 232         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
 233
 234         /*
 235          * The root volume's ondisk pointer is only valid if we hold a
 236          * reference to it.
 237          */
 238         rootvol = hammer_get_root_volume(hmp, &error);
 239         if (error)
 240                 goto done;
 241         ksnprintf(mp->mnt_stat.f_mntfromname,
 242                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
 243                   rootvol->ondisk->vol_name);
 244         hammer_rel_volume(rootvol, 0);
 245
 246         /*
 247          * Locate the root directory using the root cluster's B-Tree as a
 248          * starting point.  The root directory uses an obj_id of 1.
 249          *
 250          * FUTURE: Leave the root directory cached referenced but unlocked
 251          * in hmp->rootvp (need to flush it on unmount).
 252          */
 253         error = hammer_vfs_vget(mp, 1, &rootvp);
 254         if (error)
 255                 goto done;
 256         vput(rootvp);
 257         /*vn_unlock(hmp->rootvp);*/
 258
 259 done:
 260         /*
 261          * Cleanup and return.
 262          */
 263         if (error)
 264                 hammer_free_hmp(mp);
 265         return (error);
 266 }
 267
 268 static int
 269 hammer_vfs_unmount(struct mount *mp, int mntflags)
 270 {
 271 #if 0
 272         struct hammer_mount *hmp = (void *)mp->mnt_data;
 273 #endif
 274         int flags;
 275         int error;
 276
 277         /*
 278          * Clean out the vnodes
 279          */
 280         flags = 0;
 281         if (mntflags & MNT_FORCE)
 282                 flags |= FORCECLOSE;
 283         if ((error = vflush(mp, 0, flags)) != 0)
 284                 return (error);
 285
 286         /*
 287          * Clean up the internal mount structure and related entities.  This
 288          * may issue I/O.
 289          */
 290         hammer_free_hmp(mp);
 291         return(0);
 292 }
 293
 294 /*
 295  * Clean up the internal mount structure and disassociate it from the mount.
 296  * This may issue I/O.
 297  */
 298 static void
 299 hammer_free_hmp(struct mount *mp)
 300 {
 301         struct hammer_mount *hmp = (void *)mp->mnt_data;
 302
 303 #if 0
 304         /*
 305          * Clean up the root vnode
 306          */
 307         if (hmp->rootvp) {
 308                 vrele(hmp->rootvp);
 309                 hmp->rootvp = NULL;
 310         }
 311 #endif
 312
 313         /*
 314          * Unload & flush inodes
 315          */
 316         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
 317                 hammer_unload_inode, (void *)MNT_WAIT);
 318
 319         /*
 320          * Unload & flush volumes
 321          */
 322         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
 323                 hammer_unload_volume, NULL);
 324
 325         mp->mnt_data = NULL;
 326         mp->mnt_flag &= ~MNT_LOCAL;
 327         hmp->mp = NULL;
 328         kfree(hmp->zbuf, M_HAMMER);
 329         kfree(hmp, M_HAMMER);
 330 }
 331
 332 /*
 333  * Return the root vnode for the filesystem.
 334  *
 335  * HAMMER stores the root vnode in the hammer_mount structure so
 336  * getting it is easy.
 337  */
 338 static int
 339 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 340 {
 341         struct hammer_mount *hmp = (void *)mp->mnt_data;
 342         int error;
 343
 344         if (hmp->rootcl == NULL)
 345                 error = EIO;
 346         else
 347                 error = hammer_vfs_vget(mp, 1, vpp);
 348         return (error);
 349 #if 0
 350         /* FUTURE - cached root vnode */
 351         if ((vp = hmp->rootvp) != NULL) {
 352                 vref(vp);
 353                 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
 354                 *vpp = vp;
 355                 return (0);
 356         } else {
 357                 *vpp = NULL;
 358                 return (EIO);
 359         }
 360 #endif
 361 }
 362
 363 static int
 364 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 365 {
 366         struct hammer_mount *hmp = (void *)mp->mnt_data;
 367         hammer_volume_t volume;
 368         hammer_volume_ondisk_t ondisk;
 369         int error;
 370
 371         volume = hammer_get_root_volume(hmp, &error);
 372         if (error)
 373                 return(error);
 374
 375         ondisk = volume->ondisk;
 376
 377         mp->mnt_stat.f_bfree = mp->mnt_stat.f_blocks -
 378                                 ondisk->vol0_stat_idx_bufs -
 379                                 ondisk->vol0_stat_rec_bufs -
 380                                 ondisk->vol0_stat_data_bufs;
 381         if (mp->mnt_stat.f_bfree < 0)
 382                 mp->mnt_stat.f_bfree = 0;
 383         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 384         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 385         if (mp->mnt_stat.f_files < 0)
 386                 mp->mnt_stat.f_files = 0;
 387
 388         hammer_rel_volume(volume, 0);
 389         *sbp = mp->mnt_stat;
 390         return(0);
 391 }
 392
 393 static int
 394 hammer_vfs_sync(struct mount *mp, int waitfor)
 395 {
 396         struct hammer_mount *hmp = (void *)mp->mnt_data;
 397         int error;
 398
 399         error = hammer_sync_hmp(hmp, waitfor);
 400         return(error);
 401 }
 402