The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/vfs/hammer/hammer_vfsops.c

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    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 
   35 #include <sys/param.h>
   36 #include <sys/systm.h>
   37 #include <sys/kernel.h>
   38 #include <sys/vnode.h>
   39 #include <sys/mount.h>
   40 #include <sys/malloc.h>
   41 #include <sys/nlookup.h>
   42 #include <sys/fcntl.h>
   43 #include <sys/sysctl.h>
   44 #include <sys/buf.h>
   45 #include <sys/buf2.h>
   46 #include "hammer.h"
   47 
   48 /*
   49  * NOTE!  Global statistics may not be MPSAFE so HAMMER never uses them
   50  *        in conditionals.
   51  */
   52 int hammer_supported_version = HAMMER_VOL_VERSION_DEFAULT;
   53 int hammer_debug_io;
   54 int hammer_debug_general;
   55 int hammer_debug_debug = 1;             /* medium-error panics */ 
   56 int hammer_debug_inode;
   57 int hammer_debug_locks;
   58 int hammer_debug_btree;
   59 int hammer_debug_tid;
   60 int hammer_debug_recover;               /* -1 will disable, +1 will force */
   61 int hammer_debug_recover_faults;
   62 int hammer_debug_critical;              /* non-zero enter debugger on error */
   63 int hammer_cluster_enable = 1;          /* enable read clustering by default */
   64 int hammer_live_dedup = 0;
   65 int hammer_tdmux_ticks;
   66 int hammer_count_fsyncs;
   67 int hammer_count_inodes;
   68 int hammer_count_iqueued;
   69 int hammer_count_reclaims;
   70 int hammer_count_records;
   71 int hammer_count_record_datas;
   72 int hammer_count_volumes;
   73 int hammer_count_buffers;
   74 int hammer_count_nodes;
   75 int64_t hammer_count_extra_space_used;
   76 int64_t hammer_stats_btree_lookups;
   77 int64_t hammer_stats_btree_searches;
   78 int64_t hammer_stats_btree_inserts;
   79 int64_t hammer_stats_btree_deletes;
   80 int64_t hammer_stats_btree_elements;
   81 int64_t hammer_stats_btree_splits;
   82 int64_t hammer_stats_btree_iterations;
   83 int64_t hammer_stats_btree_root_iterations;
   84 int64_t hammer_stats_record_iterations;
   85 
   86 int64_t hammer_stats_file_read;
   87 int64_t hammer_stats_file_write;
   88 int64_t hammer_stats_file_iopsr;
   89 int64_t hammer_stats_file_iopsw;
   90 int64_t hammer_stats_disk_read;
   91 int64_t hammer_stats_disk_write;
   92 int64_t hammer_stats_inode_flushes;
   93 int64_t hammer_stats_commits;
   94 int64_t hammer_stats_undo;
   95 int64_t hammer_stats_redo;
   96 
   97 long hammer_count_dirtybufspace;        /* global */
   98 int hammer_count_refedbufs;             /* global */
   99 int hammer_count_reservations;
  100 long hammer_count_io_running_read;
  101 long hammer_count_io_running_write;
  102 int hammer_count_io_locked;
  103 long hammer_limit_dirtybufspace;        /* per-mount */
  104 int hammer_limit_recs;                  /* as a whole XXX */
  105 int hammer_limit_inode_recs = 2048;     /* per inode */
  106 int hammer_limit_reclaims;
  107 int hammer_live_dedup_cache_size = DEDUP_CACHE_SIZE;
  108 int hammer_limit_redo = 4096 * 1024;    /* per inode */
  109 int hammer_autoflush = 500;             /* auto flush (typ on reclaim) */
  110 int hammer_bio_count;
  111 int hammer_verify_zone;
  112 int hammer_verify_data = 1;
  113 int hammer_write_mode;
  114 int hammer_double_buffer;
  115 int hammer_btree_full_undo = 1;
  116 int hammer_yield_check = 16;
  117 int hammer_fsync_mode = 3;
  118 int64_t hammer_contention_count;
  119 int64_t hammer_zone_limit;
  120 
  121 /*
  122  * Live dedup debug counters (sysctls are writable so that counters
  123  * can be reset from userspace).
  124  */
  125 int64_t hammer_live_dedup_vnode_bcmps = 0;
  126 int64_t hammer_live_dedup_device_bcmps = 0;
  127 int64_t hammer_live_dedup_findblk_failures = 0;
  128 int64_t hammer_live_dedup_bmap_saves = 0;
  129 
  130 
  131 SYSCTL_NODE(_vfs, OID_AUTO, hammer, CTLFLAG_RW, 0, "HAMMER filesystem");
  132 
  133 SYSCTL_INT(_vfs_hammer, OID_AUTO, supported_version, CTLFLAG_RD,
  134            &hammer_supported_version, 0, "");
  135 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_general, CTLFLAG_RW,
  136            &hammer_debug_general, 0, "");
  137 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_io, CTLFLAG_RW,
  138            &hammer_debug_io, 0, "");
  139 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_debug, CTLFLAG_RW,
  140            &hammer_debug_debug, 0, "");
  141 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_inode, CTLFLAG_RW,
  142            &hammer_debug_inode, 0, "");
  143 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_locks, CTLFLAG_RW,
  144            &hammer_debug_locks, 0, "");
  145 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_btree, CTLFLAG_RW,
  146            &hammer_debug_btree, 0, "");
  147 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_tid, CTLFLAG_RW,
  148            &hammer_debug_tid, 0, "");
  149 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover, CTLFLAG_RW,
  150            &hammer_debug_recover, 0, "");
  151 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_recover_faults, CTLFLAG_RW,
  152            &hammer_debug_recover_faults, 0, "");
  153 SYSCTL_INT(_vfs_hammer, OID_AUTO, debug_critical, CTLFLAG_RW,
  154            &hammer_debug_critical, 0, "");
  155 SYSCTL_INT(_vfs_hammer, OID_AUTO, cluster_enable, CTLFLAG_RW,
  156            &hammer_cluster_enable, 0, "");
  157 /*
  158  * 0 - live dedup is disabled
  159  * 1 - dedup cache is populated on reads only
  160  * 2 - dedup cache is populated on both reads and writes
  161  *
  162  * LIVE_DEDUP IS DISABLED PERMANENTLY!  This feature appears to cause
  163  * blockmap corruption over time so we've turned it off permanently.
  164  */
  165 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup, CTLFLAG_RD,
  166            &hammer_live_dedup, 0, "Enable live dedup (experimental)");
  167 SYSCTL_INT(_vfs_hammer, OID_AUTO, tdmux_ticks, CTLFLAG_RW,
  168            &hammer_tdmux_ticks, 0, "Hammer tdmux ticks");
  169 
  170 SYSCTL_LONG(_vfs_hammer, OID_AUTO, limit_dirtybufspace, CTLFLAG_RW,
  171            &hammer_limit_dirtybufspace, 0, "");
  172 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_recs, CTLFLAG_RW,
  173            &hammer_limit_recs, 0, "");
  174 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_inode_recs, CTLFLAG_RW,
  175            &hammer_limit_inode_recs, 0, "");
  176 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_reclaims, CTLFLAG_RW,
  177            &hammer_limit_reclaims, 0, "");
  178 SYSCTL_INT(_vfs_hammer, OID_AUTO, live_dedup_cache_size, CTLFLAG_RW,
  179            &hammer_live_dedup_cache_size, 0,
  180            "Number of cache entries");
  181 SYSCTL_INT(_vfs_hammer, OID_AUTO, limit_redo, CTLFLAG_RW,
  182            &hammer_limit_redo, 0, "");
  183 
  184 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_fsyncs, CTLFLAG_RD,
  185            &hammer_count_fsyncs, 0, "");
  186 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_inodes, CTLFLAG_RD,
  187            &hammer_count_inodes, 0, "");
  188 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_iqueued, CTLFLAG_RD,
  189            &hammer_count_iqueued, 0, "");
  190 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reclaims, CTLFLAG_RD,
  191            &hammer_count_reclaims, 0, "");
  192 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_records, CTLFLAG_RD,
  193            &hammer_count_records, 0, "");
  194 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_record_datas, CTLFLAG_RD,
  195            &hammer_count_record_datas, 0, "");
  196 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_volumes, CTLFLAG_RD,
  197            &hammer_count_volumes, 0, "");
  198 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_buffers, CTLFLAG_RD,
  199            &hammer_count_buffers, 0, "");
  200 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_nodes, CTLFLAG_RD,
  201            &hammer_count_nodes, 0, "");
  202 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, count_extra_space_used, CTLFLAG_RD,
  203            &hammer_count_extra_space_used, 0, "");
  204 
  205 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_searches, CTLFLAG_RD,
  206            &hammer_stats_btree_searches, 0, "");
  207 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_lookups, CTLFLAG_RD,
  208            &hammer_stats_btree_lookups, 0, "");
  209 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_inserts, CTLFLAG_RD,
  210            &hammer_stats_btree_inserts, 0, "");
  211 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_deletes, CTLFLAG_RD,
  212            &hammer_stats_btree_deletes, 0, "");
  213 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_elements, CTLFLAG_RD,
  214            &hammer_stats_btree_elements, 0, "");
  215 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_splits, CTLFLAG_RD,
  216            &hammer_stats_btree_splits, 0, "");
  217 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_iterations, CTLFLAG_RD,
  218            &hammer_stats_btree_iterations, 0, "");
  219 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_btree_root_iterations, CTLFLAG_RD,
  220            &hammer_stats_btree_root_iterations, 0, "");
  221 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_record_iterations, CTLFLAG_RD,
  222            &hammer_stats_record_iterations, 0, "");
  223 
  224 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_read, CTLFLAG_RD,
  225            &hammer_stats_file_read, 0, "");
  226 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_write, CTLFLAG_RD,
  227            &hammer_stats_file_write, 0, "");
  228 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsr, CTLFLAG_RD,
  229            &hammer_stats_file_iopsr, 0, "");
  230 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_file_iopsw, CTLFLAG_RD,
  231            &hammer_stats_file_iopsw, 0, "");
  232 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_read, CTLFLAG_RD,
  233            &hammer_stats_disk_read, 0, "");
  234 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_disk_write, CTLFLAG_RD,
  235            &hammer_stats_disk_write, 0, "");
  236 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_inode_flushes, CTLFLAG_RD,
  237            &hammer_stats_inode_flushes, 0, "");
  238 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_commits, CTLFLAG_RD,
  239            &hammer_stats_commits, 0, "");
  240 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_undo, CTLFLAG_RD,
  241            &hammer_stats_undo, 0, "");
  242 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, stats_redo, CTLFLAG_RD,
  243            &hammer_stats_redo, 0, "");
  244 
  245 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_vnode_bcmps, CTLFLAG_RW,
  246             &hammer_live_dedup_vnode_bcmps, 0,
  247             "successful vnode buffer comparisons");
  248 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_device_bcmps, CTLFLAG_RW,
  249             &hammer_live_dedup_device_bcmps, 0,
  250             "successful device buffer comparisons");
  251 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_findblk_failures, CTLFLAG_RW,
  252             &hammer_live_dedup_findblk_failures, 0,
  253             "block lookup failures for comparison");
  254 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, live_dedup_bmap_saves, CTLFLAG_RW,
  255             &hammer_live_dedup_bmap_saves, 0,
  256             "useful physical block lookups");
  257 
  258 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_dirtybufspace, CTLFLAG_RD,
  259            &hammer_count_dirtybufspace, 0, "");
  260 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_refedbufs, CTLFLAG_RD,
  261            &hammer_count_refedbufs, 0, "");
  262 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_reservations, CTLFLAG_RD,
  263            &hammer_count_reservations, 0, "");
  264 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_read, CTLFLAG_RD,
  265            &hammer_count_io_running_read, 0, "");
  266 SYSCTL_INT(_vfs_hammer, OID_AUTO, count_io_locked, CTLFLAG_RD,
  267            &hammer_count_io_locked, 0, "");
  268 SYSCTL_LONG(_vfs_hammer, OID_AUTO, count_io_running_write, CTLFLAG_RD,
  269            &hammer_count_io_running_write, 0, "");
  270 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, zone_limit, CTLFLAG_RW,
  271            &hammer_zone_limit, 0, "");
  272 SYSCTL_QUAD(_vfs_hammer, OID_AUTO, contention_count, CTLFLAG_RW,
  273            &hammer_contention_count, 0, "");
  274 SYSCTL_INT(_vfs_hammer, OID_AUTO, autoflush, CTLFLAG_RW,
  275            &hammer_autoflush, 0, "");
  276 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_zone, CTLFLAG_RW,
  277            &hammer_verify_zone, 0, "");
  278 SYSCTL_INT(_vfs_hammer, OID_AUTO, verify_data, CTLFLAG_RW,
  279            &hammer_verify_data, 0, "");
  280 SYSCTL_INT(_vfs_hammer, OID_AUTO, write_mode, CTLFLAG_RW,
  281            &hammer_write_mode, 0, "");
  282 SYSCTL_INT(_vfs_hammer, OID_AUTO, double_buffer, CTLFLAG_RW,
  283            &hammer_double_buffer, 0, "");
  284 SYSCTL_INT(_vfs_hammer, OID_AUTO, btree_full_undo, CTLFLAG_RW,
  285            &hammer_btree_full_undo, 0, "");
  286 SYSCTL_INT(_vfs_hammer, OID_AUTO, yield_check, CTLFLAG_RW,
  287            &hammer_yield_check, 0, "");
  288 SYSCTL_INT(_vfs_hammer, OID_AUTO, fsync_mode, CTLFLAG_RW,
  289            &hammer_fsync_mode, 0, "");
  290 
  291 /* KTR_INFO_MASTER(hammer); */
  292 
  293 /*
  294  * VFS ABI
  295  */
  296 static void     hammer_free_hmp(struct mount *mp);
  297 
  298 static int      hammer_vfs_mount(struct mount *mp, char *path, caddr_t data,
  299                                 struct ucred *cred);
  300 static int      hammer_vfs_unmount(struct mount *mp, int mntflags);
  301 static int      hammer_vfs_root(struct mount *mp, struct vnode **vpp);
  302 static int      hammer_vfs_statfs(struct mount *mp, struct statfs *sbp,
  303                                 struct ucred *cred);
  304 static int      hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp,
  305                                 struct ucred *cred);
  306 static int      hammer_vfs_sync(struct mount *mp, int waitfor);
  307 static int      hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
  308                                 ino_t ino, struct vnode **vpp);
  309 static int      hammer_vfs_init(struct vfsconf *conf);
  310 static int      hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
  311                                 struct fid *fhp, struct vnode **vpp);
  312 static int      hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp);
  313 static int      hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
  314                                 int *exflagsp, struct ucred **credanonp);
  315 
  316 
  317 static struct vfsops hammer_vfsops = {
  318         .vfs_mount      = hammer_vfs_mount,
  319         .vfs_unmount    = hammer_vfs_unmount,
  320         .vfs_root       = hammer_vfs_root,
  321         .vfs_statfs     = hammer_vfs_statfs,
  322         .vfs_statvfs    = hammer_vfs_statvfs,
  323         .vfs_sync       = hammer_vfs_sync,
  324         .vfs_vget       = hammer_vfs_vget,
  325         .vfs_init       = hammer_vfs_init,
  326         .vfs_vptofh     = hammer_vfs_vptofh,
  327         .vfs_fhtovp     = hammer_vfs_fhtovp,
  328         .vfs_checkexp   = hammer_vfs_checkexp
  329 };
  330 
  331 MALLOC_DEFINE(M_HAMMER, "HAMMER-mount", "");
  332 
  333 VFS_SET(hammer_vfsops, hammer, 0);
  334 MODULE_VERSION(hammer, 1);
  335 
  336 static int
  337 hammer_vfs_init(struct vfsconf *conf)
  338 {
  339         long n;
  340 
  341         /*
  342          * Wait up to this long for an exclusive deadlock to clear
  343          * before acquiring a new shared lock on the ip.  The deadlock
  344          * may have occured on a b-tree node related to the ip.
  345          */
  346         if (hammer_tdmux_ticks == 0)
  347                 hammer_tdmux_ticks = hz / 5;
  348 
  349         /*
  350          * Autosize, but be careful because a hammer filesystem's
  351          * reserve is partially calculated based on dirtybufspace,
  352          * so we simply cannot allow it to get too large.
  353          */
  354         if (hammer_limit_recs == 0) {
  355                 n = nbuf * 25;
  356                 if (n > kmalloc_limit(M_HAMMER) / 512)
  357                         n = kmalloc_limit(M_HAMMER) / 512;
  358                 if (n > 2 * 1024 * 1024)
  359                         n = 2 * 1024 * 1024;
  360                 hammer_limit_recs = (int)n;
  361         }
  362         if (hammer_limit_dirtybufspace == 0) {
  363                 hammer_limit_dirtybufspace = hidirtybufspace / 2;
  364                 if (hammer_limit_dirtybufspace < 1L * 1024 * 1024)
  365                         hammer_limit_dirtybufspace = 1024L * 1024;
  366                 if (hammer_limit_dirtybufspace > 1024L * 1024 * 1024)
  367                         hammer_limit_dirtybufspace = 1024L * 1024 * 1024;
  368         }
  369 
  370         /*
  371          * The hammer_inode structure detaches from the vnode on reclaim.
  372          * This limits the number of inodes in this state to prevent a
  373          * memory pool blowout.
  374          */
  375         if (hammer_limit_reclaims == 0)
  376                 hammer_limit_reclaims = desiredvnodes / 10;
  377 
  378         return(0);
  379 }
  380 
  381 static int
  382 hammer_vfs_mount(struct mount *mp, char *mntpt, caddr_t data,
  383                  struct ucred *cred)
  384 {
  385         struct hammer_mount_info info;
  386         hammer_mount_t hmp;
  387         hammer_volume_t rootvol;
  388         struct vnode *rootvp;
  389         struct vnode *devvp = NULL;
  390         const char *upath;      /* volume name in userspace */
  391         char *path;             /* volume name in system space */
  392         int error;
  393         int i;
  394         int master_id;
  395         char *next_volume_ptr = NULL;
  396 
  397         /*
  398          * Accept hammer_mount_info.  mntpt is NULL for root mounts at boot.
  399          */
  400         if (mntpt == NULL) {
  401                 bzero(&info, sizeof(info));
  402                 info.asof = 0;
  403                 info.hflags = 0;
  404                 info.nvolumes = 1;
  405 
  406                 next_volume_ptr = mp->mnt_stat.f_mntfromname;
  407 
  408                 /* Count number of volumes separated by ':' */
  409                 for (char *p = next_volume_ptr; *p != '\0'; ++p) {
  410                         if (*p == ':') {
  411                                 ++info.nvolumes;
  412                         }
  413                 }
  414 
  415                 mp->mnt_flag &= ~MNT_RDONLY; /* mount R/W */
  416         } else {
  417                 if ((error = copyin(data, &info, sizeof(info))) != 0)
  418                         return (error);
  419         }
  420 
  421         /*
  422          * updating or new mount
  423          */
  424         if (mp->mnt_flag & MNT_UPDATE) {
  425                 hmp = (void *)mp->mnt_data;
  426                 KKASSERT(hmp != NULL);
  427         } else {
  428                 if (info.nvolumes <= 0 || info.nvolumes >= 32768)
  429                         return (EINVAL);
  430                 hmp = NULL;
  431         }
  432 
  433         /*
  434          * master-id validation.  The master id may not be changed by a
  435          * mount update.
  436          */
  437         if (info.hflags & HMNT_MASTERID) {
  438                 if (hmp && hmp->master_id != info.master_id) {
  439                         kprintf("hammer: cannot change master id "
  440                                 "with mount update\n");
  441                         return(EINVAL);
  442                 }
  443                 master_id = info.master_id;
  444                 if (master_id < -1 || master_id >= HAMMER_MAX_MASTERS)
  445                         return (EINVAL);
  446         } else {
  447                 if (hmp)
  448                         master_id = hmp->master_id;
  449                 else
  450                         master_id = 0;
  451         }
  452 
  453         /*
  454          * Internal mount data structure
  455          */
  456         if (hmp == NULL) {
  457                 hmp = kmalloc(sizeof(*hmp), M_HAMMER, M_WAITOK | M_ZERO);
  458                 mp->mnt_data = (qaddr_t)hmp;
  459                 hmp->mp = mp;
  460                 /*TAILQ_INIT(&hmp->recycle_list);*/
  461 
  462                 /*
  463                  * Make sure kmalloc type limits are set appropriately.
  464                  *
  465                  * Our inode kmalloc group is sized based on maxvnodes
  466                  * (controlled by the system, not us).
  467                  */
  468                 kmalloc_create(&hmp->m_misc, "HAMMER-others");
  469                 kmalloc_create(&hmp->m_inodes, "HAMMER-inodes");
  470 
  471                 kmalloc_raise_limit(hmp->m_inodes, 0);  /* unlimited */
  472 
  473                 hmp->root_btree_beg.localization = 0x00000000U;
  474                 hmp->root_btree_beg.obj_id = -0x8000000000000000LL;
  475                 hmp->root_btree_beg.key = -0x8000000000000000LL;
  476                 hmp->root_btree_beg.create_tid = 1;
  477                 hmp->root_btree_beg.delete_tid = 1;
  478                 hmp->root_btree_beg.rec_type = 0;
  479                 hmp->root_btree_beg.obj_type = 0;
  480 
  481                 hmp->root_btree_end.localization = 0xFFFFFFFFU;
  482                 hmp->root_btree_end.obj_id = 0x7FFFFFFFFFFFFFFFLL;
  483                 hmp->root_btree_end.key = 0x7FFFFFFFFFFFFFFFLL;
  484                 hmp->root_btree_end.create_tid = 0xFFFFFFFFFFFFFFFFULL;
  485                 hmp->root_btree_end.delete_tid = 0;   /* special case */
  486                 hmp->root_btree_end.rec_type = 0xFFFFU;
  487                 hmp->root_btree_end.obj_type = 0;
  488 
  489                 hmp->krate.freq = 1;    /* maximum reporting rate (hz) */
  490                 hmp->krate.count = -16; /* initial burst */
  491 
  492                 hmp->sync_lock.refs = 1;
  493                 hmp->free_lock.refs = 1;
  494                 hmp->undo_lock.refs = 1;
  495                 hmp->blkmap_lock.refs = 1;
  496                 hmp->snapshot_lock.refs = 1;
  497                 hmp->volume_lock.refs = 1;
  498 
  499                 TAILQ_INIT(&hmp->delay_list);
  500                 TAILQ_INIT(&hmp->flush_group_list);
  501                 TAILQ_INIT(&hmp->objid_cache_list);
  502                 TAILQ_INIT(&hmp->undo_lru_list);
  503                 TAILQ_INIT(&hmp->reclaim_list);
  504 
  505                 RB_INIT(&hmp->rb_dedup_crc_root);
  506                 RB_INIT(&hmp->rb_dedup_off_root);       
  507                 TAILQ_INIT(&hmp->dedup_lru_list);
  508         }
  509         hmp->hflags &= ~HMNT_USERFLAGS;
  510         hmp->hflags |= info.hflags & HMNT_USERFLAGS;
  511 
  512         hmp->master_id = master_id;
  513 
  514         if (info.asof) {
  515                 mp->mnt_flag |= MNT_RDONLY;
  516                 hmp->asof = info.asof;
  517         } else {
  518                 hmp->asof = HAMMER_MAX_TID;
  519         }
  520 
  521         hmp->volume_to_remove = -1;
  522 
  523         /*
  524          * Re-open read-write if originally read-only, or vise-versa.
  525          *
  526          * When going from read-only to read-write execute the stage2
  527          * recovery if it has not already been run.
  528          */
  529         if (mp->mnt_flag & MNT_UPDATE) {
  530                 lwkt_gettoken(&hmp->fs_token);
  531                 error = 0;
  532                 if (hmp->ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR)) {
  533                         kprintf("HAMMER read-only -> read-write\n");
  534                         hmp->ronly = 0;
  535                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
  536                                 hammer_adjust_volume_mode, NULL);
  537                         rootvol = hammer_get_root_volume(hmp, &error);
  538                         if (rootvol) {
  539                                 hammer_recover_flush_buffers(hmp, rootvol, 1);
  540                                 error = hammer_recover_stage2(hmp, rootvol);
  541                                 bcopy(rootvol->ondisk->vol0_blockmap,
  542                                       hmp->blockmap,
  543                                       sizeof(hmp->blockmap));
  544                                 hammer_rel_volume(rootvol, 0);
  545                         }
  546                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
  547                                 hammer_reload_inode, NULL);
  548                         /* kernel clears MNT_RDONLY */
  549                 } else if (hmp->ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
  550                         kprintf("HAMMER read-write -> read-only\n");
  551                         hmp->ronly = 1; /* messy */
  552                         RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
  553                                 hammer_reload_inode, NULL);
  554                         hmp->ronly = 0;
  555                         hammer_flusher_sync(hmp);
  556                         hammer_flusher_sync(hmp);
  557                         hammer_flusher_sync(hmp);
  558                         hmp->ronly = 1;
  559                         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
  560                                 hammer_adjust_volume_mode, NULL);
  561                 }
  562                 lwkt_reltoken(&hmp->fs_token);
  563                 return(error);
  564         }
  565 
  566         RB_INIT(&hmp->rb_vols_root);
  567         RB_INIT(&hmp->rb_inos_root);
  568         RB_INIT(&hmp->rb_redo_root);
  569         RB_INIT(&hmp->rb_nods_root);
  570         RB_INIT(&hmp->rb_undo_root);
  571         RB_INIT(&hmp->rb_resv_root);
  572         RB_INIT(&hmp->rb_bufs_root);
  573         RB_INIT(&hmp->rb_pfsm_root);
  574 
  575         hmp->ronly = ((mp->mnt_flag & MNT_RDONLY) != 0);
  576 
  577         RB_INIT(&hmp->volu_root);
  578         RB_INIT(&hmp->undo_root);
  579         RB_INIT(&hmp->data_root);
  580         RB_INIT(&hmp->meta_root);
  581         RB_INIT(&hmp->lose_root);
  582         TAILQ_INIT(&hmp->iorun_list);
  583 
  584         lwkt_token_init(&hmp->fs_token, "hammerfs");
  585         lwkt_token_init(&hmp->io_token, "hammerio");
  586 
  587         lwkt_gettoken(&hmp->fs_token);
  588 
  589         /*
  590          * Load volumes
  591          */
  592         path = objcache_get(namei_oc, M_WAITOK);
  593         hmp->nvolumes = -1;
  594         for (i = 0; i < info.nvolumes; ++i) {
  595                 if (mntpt == NULL) {
  596                         /*
  597                          * Root mount.
  598                          */
  599                         KKASSERT(next_volume_ptr != NULL);
  600                         strcpy(path, "");
  601                         if (*next_volume_ptr != '/') {
  602                                 /* relative path */
  603                                 strcpy(path, "/dev/");
  604                         }
  605                         int k;
  606                         for (k = strlen(path); k < MAXPATHLEN-1; ++k) {
  607                                 if (*next_volume_ptr == '\0') {
  608                                         break;
  609                                 } else if (*next_volume_ptr == ':') {
  610                                         ++next_volume_ptr;
  611                                         break;
  612                                 } else {
  613                                         path[k] = *next_volume_ptr;
  614                                         ++next_volume_ptr;
  615                                 }
  616                         }
  617                         path[k] = '\0';
  618 
  619                         error = 0;
  620                         cdev_t dev = kgetdiskbyname(path);
  621                         error = bdevvp(dev, &devvp);
  622                         if (error) {
  623                                 kprintf("hammer_mountroot: can't find devvp\n");
  624                         }
  625                 } else {
  626                         error = copyin(&info.volumes[i], &upath,
  627                                        sizeof(char *));
  628                         if (error == 0)
  629                                 error = copyinstr(upath, path,
  630                                                   MAXPATHLEN, NULL);
  631                 }
  632                 if (error == 0)
  633                         error = hammer_install_volume(hmp, path, devvp);
  634                 if (error)
  635                         break;
  636         }
  637         objcache_put(namei_oc, path);
  638 
  639         /*
  640          * Make sure we found a root volume
  641          */
  642         if (error == 0 && hmp->rootvol == NULL) {
  643                 kprintf("hammer_mount: No root volume found!\n");
  644                 error = EINVAL;
  645         }
  646 
  647         /*
  648          * Check that all required volumes are available
  649          */
  650         if (error == 0 && hammer_mountcheck_volumes(hmp)) {
  651                 kprintf("hammer_mount: Missing volumes, cannot mount!\n");
  652                 error = EINVAL;
  653         }
  654 
  655         if (error) {
  656                 /* called with fs_token held */
  657                 hammer_free_hmp(mp);
  658                 return (error);
  659         }
  660 
  661         /*
  662          * No errors, setup enough of the mount point so we can lookup the
  663          * root vnode.
  664          */
  665         mp->mnt_iosize_max = MAXPHYS;
  666         mp->mnt_kern_flag |= MNTK_FSMID;
  667         mp->mnt_kern_flag |= MNTK_THR_SYNC;     /* new vsyncscan semantics */
  668 
  669         /*
  670          * MPSAFE code.  Note that VOPs and VFSops which are not MPSAFE
  671          * will acquire a per-mount token prior to entry and release it
  672          * on return, so even if we do not specify it we no longer get
  673          * the BGL regardlless of how we are flagged.
  674          */
  675         mp->mnt_kern_flag |= MNTK_ALL_MPSAFE;
  676         /*MNTK_RD_MPSAFE | MNTK_GA_MPSAFE | MNTK_IN_MPSAFE;*/
  677 
  678         /* 
  679          * note: f_iosize is used by vnode_pager_haspage() when constructing
  680          * its VOP_BMAP call.
  681          */
  682         mp->mnt_stat.f_iosize = HAMMER_BUFSIZE;
  683         mp->mnt_stat.f_bsize = HAMMER_BUFSIZE;
  684 
  685         mp->mnt_vstat.f_frsize = HAMMER_BUFSIZE;
  686         mp->mnt_vstat.f_bsize = HAMMER_BUFSIZE;
  687 
  688         mp->mnt_maxsymlinklen = 255;
  689         mp->mnt_flag |= MNT_LOCAL;
  690 
  691         vfs_add_vnodeops(mp, &hammer_vnode_vops, &mp->mnt_vn_norm_ops);
  692         vfs_add_vnodeops(mp, &hammer_spec_vops, &mp->mnt_vn_spec_ops);
  693         vfs_add_vnodeops(mp, &hammer_fifo_vops, &mp->mnt_vn_fifo_ops);
  694 
  695         /*
  696          * The root volume's ondisk pointer is only valid if we hold a
  697          * reference to it.
  698          */
  699         rootvol = hammer_get_root_volume(hmp, &error);
  700         if (error)
  701                 goto failed;
  702 
  703         /*
  704          * Perform any necessary UNDO operations.  The recovery code does
  705          * call hammer_undo_lookup() so we have to pre-cache the blockmap,
  706          * and then re-copy it again after recovery is complete.
  707          *
  708          * If this is a read-only mount the UNDO information is retained
  709          * in memory in the form of dirty buffer cache buffers, and not
  710          * written back to the media.
  711          */
  712         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
  713               sizeof(hmp->blockmap));
  714 
  715         /*
  716          * Check filesystem version
  717          */
  718         hmp->version = rootvol->ondisk->vol_version;
  719         if (hmp->version < HAMMER_VOL_VERSION_MIN ||
  720             hmp->version > HAMMER_VOL_VERSION_MAX) {
  721                 kprintf("HAMMER: mount unsupported fs version %d\n",
  722                         hmp->version);
  723                 error = ERANGE;
  724                 goto done;
  725         }
  726 
  727         /*
  728          * The undo_rec_limit limits the size of flush groups to avoid
  729          * blowing out the UNDO FIFO.  This calculation is typically in
  730          * the tens of thousands and is designed primarily when small
  731          * HAMMER filesystems are created.
  732          */
  733         hmp->undo_rec_limit = hammer_undo_max(hmp) / 8192 + 100;
  734         if (hammer_debug_general & 0x0001)
  735                 kprintf("HAMMER: undo_rec_limit %d\n", hmp->undo_rec_limit);
  736 
  737         /*
  738          * NOTE: Recover stage1 not only handles meta-data recovery, it
  739          *       also sets hmp->undo_seqno for HAMMER VERSION 4+ filesystems.
  740          */
  741         error = hammer_recover_stage1(hmp, rootvol);
  742         if (error) {
  743                 kprintf("Failed to recover HAMMER filesystem on mount\n");
  744                 goto done;
  745         }
  746 
  747         /*
  748          * Finish setup now that we have a good root volume.
  749          *
  750          * The top 16 bits of fsid.val[1] is a pfs id.
  751          */
  752         ksnprintf(mp->mnt_stat.f_mntfromname,
  753                   sizeof(mp->mnt_stat.f_mntfromname), "%s",
  754                   rootvol->ondisk->vol_name);
  755         mp->mnt_stat.f_fsid.val[0] =
  756                 crc32((char *)&rootvol->ondisk->vol_fsid + 0, 8);
  757         mp->mnt_stat.f_fsid.val[1] =
  758                 crc32((char *)&rootvol->ondisk->vol_fsid + 8, 8);
  759         mp->mnt_stat.f_fsid.val[1] &= 0x0000FFFF;
  760 
  761         mp->mnt_vstat.f_fsid_uuid = rootvol->ondisk->vol_fsid;
  762         mp->mnt_vstat.f_fsid = crc32(&mp->mnt_vstat.f_fsid_uuid,
  763                                      sizeof(mp->mnt_vstat.f_fsid_uuid));
  764 
  765         /*
  766          * Certain often-modified fields in the root volume are cached in
  767          * the hammer_mount structure so we do not have to generate lots
  768          * of little UNDO structures for them.
  769          *
  770          * Recopy after recovery.  This also has the side effect of
  771          * setting our cached undo FIFO's first_offset, which serves to
  772          * placemark the FIFO start for the NEXT flush cycle while the
  773          * on-disk first_offset represents the LAST flush cycle.
  774          */
  775         hmp->next_tid = rootvol->ondisk->vol0_next_tid;
  776         hmp->flush_tid1 = hmp->next_tid;
  777         hmp->flush_tid2 = hmp->next_tid;
  778         bcopy(rootvol->ondisk->vol0_blockmap, hmp->blockmap,
  779               sizeof(hmp->blockmap));
  780         hmp->copy_stat_freebigblocks = rootvol->ondisk->vol0_stat_freebigblocks;
  781 
  782         hammer_flusher_create(hmp);
  783 
  784         /*
  785          * Locate the root directory using the root cluster's B-Tree as a
  786          * starting point.  The root directory uses an obj_id of 1.
  787          *
  788          * FUTURE: Leave the root directory cached referenced but unlocked
  789          * in hmp->rootvp (need to flush it on unmount).
  790          */
  791         error = hammer_vfs_vget(mp, NULL, 1, &rootvp);
  792         if (error)
  793                 goto done;
  794         vput(rootvp);
  795         /*vn_unlock(hmp->rootvp);*/
  796         if (hmp->ronly == 0)
  797                 error = hammer_recover_stage2(hmp, rootvol);
  798 
  799         /*
  800          * If the stage2 recovery fails be sure to clean out all cached
  801          * vnodes before throwing away the mount structure or bad things
  802          * will happen.
  803          */
  804         if (error)
  805                 vflush(mp, 0, 0);
  806 
  807 done:
  808         if ((mp->mnt_flag & MNT_UPDATE) == 0) {
  809                 /* New mount */
  810 
  811                 /* Populate info for mount point (NULL pad)*/
  812                 bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
  813                 size_t size;
  814                 if (mntpt) {
  815                         copyinstr(mntpt, mp->mnt_stat.f_mntonname,
  816                                                         MNAMELEN -1, &size);
  817                 } else { /* Root mount */
  818                         mp->mnt_stat.f_mntonname[0] = '/';
  819                 }
  820         }
  821         (void)VFS_STATFS(mp, &mp->mnt_stat, cred);
  822         hammer_rel_volume(rootvol, 0);
  823 failed:
  824         /*
  825          * Cleanup and return.
  826          */
  827         if (error) {
  828                 /* called with fs_token held */
  829                 hammer_free_hmp(mp);
  830         } else {
  831                 lwkt_reltoken(&hmp->fs_token);
  832         }
  833         return (error);
  834 }
  835 
  836 static int
  837 hammer_vfs_unmount(struct mount *mp, int mntflags)
  838 {
  839         hammer_mount_t hmp = (void *)mp->mnt_data;
  840         int flags;
  841         int error;
  842 
  843         /*
  844          * Clean out the vnodes
  845          */
  846         lwkt_gettoken(&hmp->fs_token);
  847         flags = 0;
  848         if (mntflags & MNT_FORCE)
  849                 flags |= FORCECLOSE;
  850         error = vflush(mp, 0, flags);
  851 
  852         /*
  853          * Clean up the internal mount structure and related entities.  This
  854          * may issue I/O.
  855          */
  856         if (error == 0) {
  857                 /* called with fs_token held */
  858                 hammer_free_hmp(mp);
  859         } else {
  860                 lwkt_reltoken(&hmp->fs_token);
  861         }
  862         return(error);
  863 }
  864 
  865 /*
  866  * Clean up the internal mount structure and disassociate it from the mount.
  867  * This may issue I/O.
  868  *
  869  * Called with fs_token held.
  870  */
  871 static void
  872 hammer_free_hmp(struct mount *mp)
  873 {
  874         hammer_mount_t hmp = (void *)mp->mnt_data;
  875         hammer_flush_group_t flg;
  876         int count;
  877         int dummy;
  878 
  879         /*
  880          * Flush anything dirty.  This won't even run if the
  881          * filesystem errored-out.
  882          */
  883         count = 0;
  884         while (hammer_flusher_haswork(hmp)) {
  885                 hammer_flusher_sync(hmp);
  886                 ++count;
  887                 if (count >= 5) {
  888                         if (count == 5)
  889                                 kprintf("HAMMER: umount flushing.");
  890                         else
  891                                 kprintf(".");
  892                         tsleep(&dummy, 0, "hmrufl", hz);
  893                 }
  894                 if (count == 30) {
  895                         kprintf("giving up\n");
  896                         break;
  897                 }
  898         }
  899         if (count >= 5 && count < 30)
  900                 kprintf("\n");
  901 
  902         /*
  903          * If the mount had a critical error we have to destroy any
  904          * remaining inodes before we can finish cleaning up the flusher.
  905          */
  906         if (hmp->flags & HAMMER_MOUNT_CRITICAL_ERROR) {
  907                 RB_SCAN(hammer_ino_rb_tree, &hmp->rb_inos_root, NULL,
  908                         hammer_destroy_inode_callback, NULL);
  909         }
  910 
  911         /*
  912          * There shouldn't be any inodes left now and any left over
  913          * flush groups should now be empty.
  914          */
  915         KKASSERT(RB_EMPTY(&hmp->rb_inos_root));
  916         while ((flg = TAILQ_FIRST(&hmp->flush_group_list)) != NULL) {
  917                 TAILQ_REMOVE(&hmp->flush_group_list, flg, flush_entry);
  918                 KKASSERT(RB_EMPTY(&flg->flush_tree));
  919                 if (flg->refs) {
  920                         kprintf("HAMMER: Warning, flush_group %p was "
  921                                 "not empty on umount!\n", flg);
  922                 }
  923                 kfree(flg, hmp->m_misc);
  924         }
  925 
  926         /*
  927          * We can finally destroy the flusher
  928          */
  929         hammer_flusher_destroy(hmp);
  930 
  931         /*
  932          * We may have held recovered buffers due to a read-only mount.
  933          * These must be discarded.
  934          */
  935         if (hmp->ronly)
  936                 hammer_recover_flush_buffers(hmp, NULL, -1);
  937 
  938         /*
  939          * Unload buffers and then volumes
  940          */
  941         RB_SCAN(hammer_buf_rb_tree, &hmp->rb_bufs_root, NULL,
  942                 hammer_unload_buffer, NULL);
  943         RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
  944                 hammer_unload_volume, NULL);
  945 
  946         mp->mnt_data = NULL;
  947         mp->mnt_flag &= ~MNT_LOCAL;
  948         hmp->mp = NULL;
  949         hammer_destroy_objid_cache(hmp);
  950         hammer_destroy_dedup_cache(hmp);
  951         if (hmp->dedup_free_cache != NULL) {
  952                 kfree(hmp->dedup_free_cache, hmp->m_misc);
  953                 hmp->dedup_free_cache = NULL;
  954         }
  955         kmalloc_destroy(&hmp->m_misc);
  956         kmalloc_destroy(&hmp->m_inodes);
  957         lwkt_reltoken(&hmp->fs_token);
  958         kfree(hmp, M_HAMMER);
  959 }
  960 
  961 /*
  962  * Report critical errors.  ip may be NULL.
  963  */
  964 void
  965 hammer_critical_error(hammer_mount_t hmp, hammer_inode_t ip,
  966                       int error, const char *msg)
  967 {
  968         hmp->flags |= HAMMER_MOUNT_CRITICAL_ERROR;
  969 
  970         krateprintf(&hmp->krate,
  971                     "HAMMER(%s): Critical error inode=%jd error=%d %s\n",
  972                     hmp->mp->mnt_stat.f_mntfromname,
  973                     (intmax_t)(ip ? ip->obj_id : -1),
  974                     error, msg);
  975 
  976         if (hmp->ronly == 0) {
  977                 hmp->ronly = 2;         /* special errored read-only mode */
  978                 hmp->mp->mnt_flag |= MNT_RDONLY;
  979                 RB_SCAN(hammer_vol_rb_tree, &hmp->rb_vols_root, NULL,
  980                         hammer_adjust_volume_mode, NULL);
  981                 kprintf("HAMMER(%s): Forcing read-only mode\n",
  982                         hmp->mp->mnt_stat.f_mntfromname);
  983         }
  984         hmp->error = error;
  985         if (hammer_debug_critical)
  986                 Debugger("Entering debugger");
  987 }
  988 
  989 
  990 /*
  991  * Obtain a vnode for the specified inode number.  An exclusively locked
  992  * vnode is returned.
  993  */
  994 int
  995 hammer_vfs_vget(struct mount *mp, struct vnode *dvp,
  996                 ino_t ino, struct vnode **vpp)
  997 {
  998         struct hammer_transaction trans;
  999         struct hammer_mount *hmp = (void *)mp->mnt_data;
 1000         struct hammer_inode *ip;
 1001         int error;
 1002         u_int32_t localization;
 1003 
 1004         lwkt_gettoken(&hmp->fs_token);
 1005         hammer_simple_transaction(&trans, hmp);
 1006 
 1007         /*
 1008          * If a directory vnode is supplied (mainly NFS) then we can acquire
 1009          * the PFS domain from it.  Otherwise we would only be able to vget
 1010          * inodes in the root PFS.
 1011          */
 1012         if (dvp) {
 1013                 localization = HAMMER_DEF_LOCALIZATION +
 1014                                 VTOI(dvp)->obj_localization;
 1015         } else {
 1016                 localization = HAMMER_DEF_LOCALIZATION;
 1017         }
 1018 
 1019         /*
 1020          * Lookup the requested HAMMER inode.  The structure must be
 1021          * left unlocked while we manipulate the related vnode to avoid
 1022          * a deadlock.
 1023          */
 1024         ip = hammer_get_inode(&trans, NULL, ino,
 1025                               hmp->asof, localization,
 1026                               0, &error);
 1027         if (ip == NULL) {
 1028                 *vpp = NULL;
 1029         } else {
 1030                 error = hammer_get_vnode(ip, vpp);
 1031                 hammer_rel_inode(ip, 0);
 1032         }
 1033         hammer_done_transaction(&trans);
 1034         lwkt_reltoken(&hmp->fs_token);
 1035         return (error);
 1036 }
 1037 
 1038 /*
 1039  * Return the root vnode for the filesystem.
 1040  *
 1041  * HAMMER stores the root vnode in the hammer_mount structure so
 1042  * getting it is easy.
 1043  */
 1044 static int
 1045 hammer_vfs_root(struct mount *mp, struct vnode **vpp)
 1046 {
 1047         int error;
 1048 
 1049         error = hammer_vfs_vget(mp, NULL, 1, vpp);
 1050         return (error);
 1051 }
 1052 
 1053 static int
 1054 hammer_vfs_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
 1055 {
 1056         struct hammer_mount *hmp = (void *)mp->mnt_data;
 1057         hammer_volume_t volume;
 1058         hammer_volume_ondisk_t ondisk;
 1059         int error;
 1060         int64_t bfree;
 1061         int64_t breserved;
 1062 
 1063         lwkt_gettoken(&hmp->fs_token);
 1064         volume = hammer_get_root_volume(hmp, &error);
 1065         if (error) {
 1066                 lwkt_reltoken(&hmp->fs_token);
 1067                 return(error);
 1068         }
 1069         ondisk = volume->ondisk;
 1070 
 1071         /*
 1072          * Basic stats
 1073          */
 1074         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 1075         mp->mnt_stat.f_files = ondisk->vol0_stat_inodes;
 1076         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 1077         hammer_rel_volume(volume, 0);
 1078 
 1079         mp->mnt_stat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 1080         mp->mnt_stat.f_bavail = mp->mnt_stat.f_bfree;
 1081         if (mp->mnt_stat.f_files < 0)
 1082                 mp->mnt_stat.f_files = 0;
 1083 
 1084         *sbp = mp->mnt_stat;
 1085         lwkt_reltoken(&hmp->fs_token);
 1086         return(0);
 1087 }
 1088 
 1089 static int
 1090 hammer_vfs_statvfs(struct mount *mp, struct statvfs *sbp, struct ucred *cred)
 1091 {
 1092         struct hammer_mount *hmp = (void *)mp->mnt_data;
 1093         hammer_volume_t volume;
 1094         hammer_volume_ondisk_t ondisk;
 1095         int error;
 1096         int64_t bfree;
 1097         int64_t breserved;
 1098 
 1099         lwkt_gettoken(&hmp->fs_token);
 1100         volume = hammer_get_root_volume(hmp, &error);
 1101         if (error) {
 1102                 lwkt_reltoken(&hmp->fs_token);
 1103                 return(error);
 1104         }
 1105         ondisk = volume->ondisk;
 1106 
 1107         /*
 1108          * Basic stats
 1109          */
 1110         _hammer_checkspace(hmp, HAMMER_CHKSPC_WRITE, &breserved);
 1111         mp->mnt_vstat.f_files = ondisk->vol0_stat_inodes;
 1112         bfree = ondisk->vol0_stat_freebigblocks * HAMMER_LARGEBLOCK_SIZE;
 1113         hammer_rel_volume(volume, 0);
 1114 
 1115         mp->mnt_vstat.f_bfree = (bfree - breserved) / HAMMER_BUFSIZE;
 1116         mp->mnt_vstat.f_bavail = mp->mnt_vstat.f_bfree;
 1117         if (mp->mnt_vstat.f_files < 0)
 1118                 mp->mnt_vstat.f_files = 0;
 1119         *sbp = mp->mnt_vstat;
 1120         lwkt_reltoken(&hmp->fs_token);
 1121         return(0);
 1122 }
 1123 
 1124 /*
 1125  * Sync the filesystem.  Currently we have to run it twice, the second
 1126  * one will advance the undo start index to the end index, so if a crash
 1127  * occurs no undos will be run on mount.
 1128  *
 1129  * We do not sync the filesystem if we are called from a panic.  If we did
 1130  * we might end up blowing up a sync that was already in progress.
 1131  */
 1132 static int
 1133 hammer_vfs_sync(struct mount *mp, int waitfor)
 1134 {
 1135         struct hammer_mount *hmp = (void *)mp->mnt_data;
 1136         int error;
 1137 
 1138         lwkt_gettoken(&hmp->fs_token);
 1139         if (panicstr == NULL) {
 1140                 error = hammer_sync_hmp(hmp, waitfor);
 1141         } else {
 1142                 error = EIO;
 1143         }
 1144         lwkt_reltoken(&hmp->fs_token);
 1145         return (error);
 1146 }
 1147 
 1148 /*
 1149  * Convert a vnode to a file handle.
 1150  *
 1151  * Accesses read-only fields on already-referenced structures so
 1152  * no token is needed.
 1153  */
 1154 static int
 1155 hammer_vfs_vptofh(struct vnode *vp, struct fid *fhp)
 1156 {
 1157         hammer_inode_t ip;
 1158 
 1159         KKASSERT(MAXFIDSZ >= 16);
 1160         ip = VTOI(vp);
 1161         fhp->fid_len = offsetof(struct fid, fid_data[16]);
 1162         fhp->fid_ext = ip->obj_localization >> 16;
 1163         bcopy(&ip->obj_id, fhp->fid_data + 0, sizeof(ip->obj_id));
 1164         bcopy(&ip->obj_asof, fhp->fid_data + 8, sizeof(ip->obj_asof));
 1165         return(0);
 1166 }
 1167 
 1168 
 1169 /*
 1170  * Convert a file handle back to a vnode.
 1171  *
 1172  * Use rootvp to enforce PFS isolation when a PFS is exported via a
 1173  * null mount.
 1174  */
 1175 static int
 1176 hammer_vfs_fhtovp(struct mount *mp, struct vnode *rootvp,
 1177                   struct fid *fhp, struct vnode **vpp)
 1178 {
 1179         hammer_mount_t hmp = (void *)mp->mnt_data;
 1180         struct hammer_transaction trans;
 1181         struct hammer_inode *ip;
 1182         struct hammer_inode_info info;
 1183         int error;
 1184         u_int32_t localization;
 1185 
 1186         bcopy(fhp->fid_data + 0, &info.obj_id, sizeof(info.obj_id));
 1187         bcopy(fhp->fid_data + 8, &info.obj_asof, sizeof(info.obj_asof));
 1188         if (rootvp)
 1189                 localization = VTOI(rootvp)->obj_localization;
 1190         else
 1191                 localization = (u_int32_t)fhp->fid_ext << 16;
 1192 
 1193         lwkt_gettoken(&hmp->fs_token);
 1194         hammer_simple_transaction(&trans, hmp);
 1195 
 1196         /*
 1197          * Get/allocate the hammer_inode structure.  The structure must be
 1198          * unlocked while we manipulate the related vnode to avoid a
 1199          * deadlock.
 1200          */
 1201         ip = hammer_get_inode(&trans, NULL, info.obj_id,
 1202                               info.obj_asof, localization, 0, &error);
 1203         if (ip) {
 1204                 error = hammer_get_vnode(ip, vpp);
 1205                 hammer_rel_inode(ip, 0);
 1206         } else {
 1207                 *vpp = NULL;
 1208         }
 1209         hammer_done_transaction(&trans);
 1210         lwkt_reltoken(&hmp->fs_token);
 1211         return (error);
 1212 }
 1213 
 1214 static int
 1215 hammer_vfs_checkexp(struct mount *mp, struct sockaddr *nam,
 1216                     int *exflagsp, struct ucred **credanonp)
 1217 {
 1218         hammer_mount_t hmp = (void *)mp->mnt_data;
 1219         struct netcred *np;
 1220         int error;
 1221 
 1222         lwkt_gettoken(&hmp->fs_token);
 1223         np = vfs_export_lookup(mp, &hmp->export, nam);
 1224         if (np) {
 1225                 *exflagsp = np->netc_exflags;
 1226                 *credanonp = &np->netc_anon;
 1227                 error = 0;
 1228         } else {
 1229                 error = EACCES;
 1230         }
 1231         lwkt_reltoken(&hmp->fs_token);
 1232         return (error);
 1233 
 1234 }
 1235 
 1236 int
 1237 hammer_vfs_export(struct mount *mp, int op, const struct export_args *export)
 1238 {
 1239         hammer_mount_t hmp = (void *)mp->mnt_data;
 1240         int error;
 1241 
 1242         lwkt_gettoken(&hmp->fs_token);
 1243 
 1244         switch(op) {
 1245         case MOUNTCTL_SET_EXPORT:
 1246                 error = vfs_export(mp, &hmp->export, export);
 1247                 break;
 1248         default:
 1249                 error = EOPNOTSUPP;
 1250                 break;
 1251         }
 1252         lwkt_reltoken(&hmp->fs_token);
 1253 
 1254         return(error);
 1255 }
 1256 

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