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/fs/nandfs/nandfs_dat.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2010-2012 Semihalf.
    5  * All rights reserved.
    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  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD$");
   31 
   32 #include <sys/param.h>
   33 #include <sys/systm.h>
   34 #include <sys/conf.h>
   35 #include <sys/kernel.h>
   36 #include <sys/lock.h>
   37 #include <sys/malloc.h>
   38 #include <sys/mount.h>
   39 #include <sys/mutex.h>
   40 #include <sys/namei.h>
   41 #include <sys/sysctl.h>
   42 #include <sys/vnode.h>
   43 #include <sys/buf.h>
   44 #include <sys/bio.h>
   45 
   46 #include <vm/vm.h>
   47 #include <vm/vm_param.h>
   48 #include <vm/vm_kern.h>
   49 #include <vm/vm_page.h>
   50 
   51 #include <fs/nandfs/nandfs_mount.h>
   52 #include <fs/nandfs/nandfs.h>
   53 #include <fs/nandfs/nandfs_subr.h>
   54 
   55 int
   56 nandfs_vblock_alloc(struct nandfs_device *nandfsdev, nandfs_daddr_t *vblock)
   57 {
   58         struct nandfs_node *dat;
   59         struct nandfs_mdt *mdt;
   60         struct nandfs_alloc_request req;
   61         struct nandfs_dat_entry *dat_entry;
   62         uint64_t start;
   63         uint32_t entry;
   64         int locked, error;
   65 
   66         dat = nandfsdev->nd_dat_node;
   67         mdt = &nandfsdev->nd_dat_mdt;
   68         start = nandfsdev->nd_last_cno + 1;
   69 
   70         locked = NANDFS_VOP_ISLOCKED(NTOV(dat));
   71         if (!locked)
   72                 VOP_LOCK(NTOV(dat), LK_EXCLUSIVE);
   73         req.entrynum = 0;
   74 
   75         /* Alloc vblock number */
   76         error = nandfs_find_free_entry(mdt, dat, &req);
   77         if (error) {
   78                 nandfs_error("%s: cannot find free vblk entry\n",
   79                     __func__);
   80                 if (!locked)
   81                         VOP_UNLOCK(NTOV(dat), 0);
   82                 return (error);
   83         }
   84 
   85         /* Read/create buffer */
   86         error = nandfs_get_entry_block(mdt, dat, &req, &entry, 1);
   87         if (error) {
   88                 nandfs_error("%s: cannot get free vblk entry\n",
   89                     __func__);
   90                 nandfs_abort_entry(&req);
   91                 if (!locked)
   92                         VOP_UNLOCK(NTOV(dat), 0);
   93                 return (error);
   94         }
   95 
   96         /* Fill out vblock data */
   97         dat_entry = (struct nandfs_dat_entry *) req.bp_entry->b_data;
   98         dat_entry[entry].de_start = start;
   99         dat_entry[entry].de_end = UINTMAX_MAX;
  100         dat_entry[entry].de_blocknr = 0;
  101 
  102         /* Commit allocation */
  103         error = nandfs_alloc_entry(mdt, &req);
  104         if (error) {
  105                 nandfs_error("%s: cannot get free vblk entry\n",
  106                     __func__);
  107                 if (!locked)
  108                         VOP_UNLOCK(NTOV(dat), 0);
  109                 return (error);
  110         }
  111 
  112         /* Return allocated vblock */
  113         *vblock = req.entrynum;
  114         DPRINTF(DAT, ("%s: allocated vblock %#jx\n",
  115             __func__, (uintmax_t)*vblock));
  116 
  117         if (!locked)
  118                 VOP_UNLOCK(NTOV(dat), 0);
  119         return (error);
  120 }
  121 
  122 int
  123 nandfs_vblock_assign(struct nandfs_device *nandfsdev, nandfs_daddr_t vblock,
  124     nandfs_lbn_t block)
  125 {
  126         struct nandfs_node *dat;
  127         struct nandfs_mdt *mdt;
  128         struct nandfs_alloc_request req;
  129         struct nandfs_dat_entry *dat_entry;
  130         uint32_t entry;
  131         int locked, error;
  132 
  133         dat = nandfsdev->nd_dat_node;
  134         mdt = &nandfsdev->nd_dat_mdt;
  135 
  136         locked = NANDFS_VOP_ISLOCKED(NTOV(dat));
  137         if (!locked)
  138                 VOP_LOCK(NTOV(dat), LK_EXCLUSIVE);
  139         req.entrynum = vblock;
  140 
  141         error = nandfs_get_entry_block(mdt, dat, &req, &entry, 0);
  142         if (!error) {
  143                 dat_entry = (struct nandfs_dat_entry *) req.bp_entry->b_data;
  144                 dat_entry[entry].de_blocknr = block;
  145 
  146                 DPRINTF(DAT, ("%s: assing vblock %jx->%jx\n",
  147                     __func__, (uintmax_t)vblock, (uintmax_t)block));
  148 
  149                 /*
  150                  * It is mostly called from syncer() so
  151                  * we want to force making buf dirty
  152                  */
  153                 error = nandfs_dirty_buf(req.bp_entry, 1);
  154         }
  155 
  156         if (!locked)
  157                 VOP_UNLOCK(NTOV(dat), 0);
  158 
  159         return (error);
  160 }
  161 
  162 int
  163 nandfs_vblock_end(struct nandfs_device *nandfsdev, nandfs_daddr_t vblock)
  164 {
  165         struct nandfs_node *dat;
  166         struct nandfs_mdt *mdt;
  167         struct nandfs_alloc_request req;
  168         struct nandfs_dat_entry *dat_entry;
  169         uint64_t end;
  170         uint32_t entry;
  171         int locked, error;
  172 
  173         dat = nandfsdev->nd_dat_node;
  174         mdt = &nandfsdev->nd_dat_mdt;
  175         end = nandfsdev->nd_last_cno;
  176 
  177         locked = NANDFS_VOP_ISLOCKED(NTOV(dat));
  178         if (!locked)
  179                 VOP_LOCK(NTOV(dat), LK_EXCLUSIVE);
  180         req.entrynum = vblock;
  181 
  182         error = nandfs_get_entry_block(mdt, dat, &req, &entry, 0);
  183         if (!error) {
  184                 dat_entry = (struct nandfs_dat_entry *) req.bp_entry->b_data;
  185                 dat_entry[entry].de_end = end;
  186                 DPRINTF(DAT, ("%s: end vblock %#jx at checkpoint %#jx\n",
  187                     __func__, (uintmax_t)vblock, (uintmax_t)end));
  188 
  189                 /*
  190                  * It is mostly called from syncer() so
  191                  * we want to force making buf dirty
  192                  */
  193                 error = nandfs_dirty_buf(req.bp_entry, 1);
  194         }
  195 
  196         if (!locked)
  197                 VOP_UNLOCK(NTOV(dat), 0);
  198 
  199         return (error);
  200 }
  201 
  202 int
  203 nandfs_vblock_free(struct nandfs_device *nandfsdev, nandfs_daddr_t vblock)
  204 {
  205         struct nandfs_node *dat;
  206         struct nandfs_mdt *mdt;
  207         struct nandfs_alloc_request req;
  208         int error;
  209 
  210         dat = nandfsdev->nd_dat_node;
  211         mdt = &nandfsdev->nd_dat_mdt;
  212 
  213         VOP_LOCK(NTOV(dat), LK_EXCLUSIVE);
  214         req.entrynum = vblock;
  215 
  216         error = nandfs_find_entry(mdt, dat, &req);
  217         if (!error) {
  218                 DPRINTF(DAT, ("%s: vblk %#jx\n", __func__, (uintmax_t)vblock));
  219                 nandfs_free_entry(mdt, &req);
  220         }
  221 
  222         VOP_UNLOCK(NTOV(dat), 0);
  223         return (error);
  224 }
  225 
  226 int
  227 nandfs_get_dat_vinfo_ioctl(struct nandfs_device *nandfsdev, struct nandfs_argv *nargv)
  228 {
  229         struct nandfs_vinfo *vinfo;
  230         size_t size;
  231         int error;
  232 
  233         if (nargv->nv_nmembs > NANDFS_VINFO_MAX)
  234                 return (EINVAL);
  235 
  236         size = sizeof(struct nandfs_vinfo) * nargv->nv_nmembs;
  237         vinfo = malloc(size, M_NANDFSTEMP, M_WAITOK|M_ZERO);
  238 
  239         error = copyin((void *)(uintptr_t)nargv->nv_base, vinfo, size);
  240         if (error) {
  241                 free(vinfo, M_NANDFSTEMP);
  242                 return (error);
  243         }
  244 
  245         error = nandfs_get_dat_vinfo(nandfsdev, vinfo, nargv->nv_nmembs);
  246         if (error == 0)
  247                 error = copyout(vinfo, (void *)(uintptr_t)nargv->nv_base, size);
  248         free(vinfo, M_NANDFSTEMP);
  249         return (error);
  250 }
  251 
  252 int
  253 nandfs_get_dat_vinfo(struct nandfs_device *nandfsdev, struct nandfs_vinfo *vinfo,
  254     uint32_t nmembs)
  255 {
  256         struct nandfs_node *dat;
  257         struct nandfs_mdt *mdt;
  258         struct nandfs_alloc_request req;
  259         struct nandfs_dat_entry *dat_entry;
  260         uint32_t i, idx;
  261         int error = 0;
  262 
  263         dat = nandfsdev->nd_dat_node;
  264         mdt = &nandfsdev->nd_dat_mdt;
  265 
  266         DPRINTF(DAT, ("%s: nmembs %#x\n", __func__, nmembs));
  267 
  268         VOP_LOCK(NTOV(dat), LK_EXCLUSIVE);
  269 
  270         for (i = 0; i < nmembs; i++) {
  271                 req.entrynum = vinfo[i].nvi_vblocknr;
  272 
  273                 error = nandfs_get_entry_block(mdt, dat,&req, &idx, 0);
  274                 if (error)
  275                         break;
  276 
  277                 dat_entry = ((struct nandfs_dat_entry *) req.bp_entry->b_data);
  278                 vinfo[i].nvi_start = dat_entry[idx].de_start;
  279                 vinfo[i].nvi_end = dat_entry[idx].de_end;
  280                 vinfo[i].nvi_blocknr = dat_entry[idx].de_blocknr;
  281 
  282                 DPRINTF(DAT, ("%s: vinfo: %jx[%jx-%jx]->%jx\n",
  283                     __func__, vinfo[i].nvi_vblocknr, vinfo[i].nvi_start,
  284                     vinfo[i].nvi_end, vinfo[i].nvi_blocknr));
  285 
  286                 brelse(req.bp_entry);
  287         }
  288 
  289         VOP_UNLOCK(NTOV(dat), 0);
  290         return (error);
  291 }
  292 
  293 int
  294 nandfs_get_dat_bdescs_ioctl(struct nandfs_device *nffsdev,
  295     struct nandfs_argv *nargv)
  296 {
  297         struct nandfs_bdesc *bd;
  298         size_t size, sizecheck;
  299         int error;
  300 
  301         sizecheck = nargv->nv_nmembs;
  302         if (sizecheck >= SIZE_MAX / sizeof(struct nandfs_bdesc))
  303                 return (EINVAL);
  304                 
  305         size = nargv->nv_nmembs * sizeof(struct nandfs_bdesc);
  306         bd = malloc(size, M_NANDFSTEMP, M_WAITOK);
  307         error = copyin((void *)(uintptr_t)nargv->nv_base, bd, size);
  308         if (error) {
  309                 free(bd, M_NANDFSTEMP);
  310                 return (error);
  311         }
  312 
  313         error = nandfs_get_dat_bdescs(nffsdev, bd, nargv->nv_nmembs);
  314 
  315         if (error == 0)
  316                 error = copyout(bd, (void *)(uintptr_t)nargv->nv_base, size);
  317 
  318         free(bd, M_NANDFSTEMP);
  319         return (error);
  320 }
  321 
  322 int
  323 nandfs_get_dat_bdescs(struct nandfs_device *nffsdev, struct nandfs_bdesc *bd,
  324     uint32_t nmembs)
  325 {
  326         struct nandfs_node *dat_node;
  327         uint64_t map;
  328         uint32_t i;
  329         int error = 0;
  330 
  331         dat_node = nffsdev->nd_dat_node;
  332 
  333         VOP_LOCK(NTOV(dat_node), LK_EXCLUSIVE);
  334 
  335         for (i = 0; i < nmembs; i++) {
  336                 DPRINTF(CLEAN,
  337                     ("%s: bd ino:%#jx oblk:%#jx blocknr:%#jx off:%#jx\n",
  338                     __func__,  (uintmax_t)bd[i].bd_ino,
  339                     (uintmax_t)bd[i].bd_oblocknr, (uintmax_t)bd[i].bd_blocknr,
  340                     (uintmax_t)bd[i].bd_offset));
  341 
  342                 error = nandfs_bmap_lookup(dat_node, bd[i].bd_offset, &map);
  343                 if (error)
  344                         break;
  345                 bd[i].bd_blocknr = map;
  346         }
  347 
  348         VOP_UNLOCK(NTOV(dat_node), 0);
  349         return (error);
  350 }

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