2 * Copyright (c) 2007 Doug Rabson
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
33 * Stand-alone file reading package.
38 #include <sys/param.h>
40 #include <sys/queue.h>
45 #include <bootstrap.h>
51 /* Define the range of indexes to be populated with ZFS Boot Environments */
52 #define ZFS_BE_FIRST 4
55 static int zfs_open(const char *path, struct open_file *f);
56 static int zfs_close(struct open_file *f);
57 static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
58 static off_t zfs_seek(struct open_file *f, off_t offset, int where);
59 static int zfs_stat(struct open_file *f, struct stat *sb);
60 static int zfs_readdir(struct open_file *f, struct dirent *d);
62 static void zfs_bootenv_initial(const char *);
66 struct fs_ops zfs_fsops = {
81 off_t f_seekp; /* seek pointer */
83 uint64_t f_zap_type; /* zap type for readdir */
84 uint64_t f_num_leafs; /* number of fzap leaf blocks */
85 zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
88 static int zfs_env_index;
89 static int zfs_env_count;
91 SLIST_HEAD(zfs_be_list, zfs_be_entry) zfs_be_head = SLIST_HEAD_INITIALIZER(zfs_be_head);
92 struct zfs_be_list *zfs_be_headp;
95 SLIST_ENTRY(zfs_be_entry) entries;
96 } *zfs_be, *zfs_be_tmp;
102 zfs_open(const char *upath, struct open_file *f)
104 struct zfsmount *mount = (struct zfsmount *)f->f_devdata;
108 if (f->f_dev != &zfs_dev)
111 /* allocate file system specific data structure */
112 fp = calloc(1, sizeof(struct file));
117 rc = zfs_lookup(mount, upath, &fp->f_dnode);
127 zfs_close(struct open_file *f)
129 struct file *fp = (struct file *)f->f_fsdata;
131 dnode_cache_obj = NULL;
139 * Copy a portion of a file into kernel memory.
140 * Cross block boundaries when necessary.
143 zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
145 const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
146 struct file *fp = (struct file *)f->f_fsdata;
151 rc = zfs_stat(f, &sb);
155 if (fp->f_seekp + n > sb.st_size)
156 n = sb.st_size - fp->f_seekp;
158 rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
164 for (i = 0; i < n; i++)
165 putchar(((char*) start)[i]);
175 zfs_seek(struct open_file *f, off_t offset, int where)
177 struct file *fp = (struct file *)f->f_fsdata;
181 fp->f_seekp = offset;
184 fp->f_seekp += offset;
191 error = zfs_stat(f, &sb);
196 fp->f_seekp = sb.st_size - offset;
203 return (fp->f_seekp);
207 zfs_stat(struct open_file *f, struct stat *sb)
209 const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
210 struct file *fp = (struct file *)f->f_fsdata;
212 return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
216 zfs_readdir(struct open_file *f, struct dirent *d)
218 const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
219 struct file *fp = (struct file *)f->f_fsdata;
222 size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
225 rc = zfs_stat(f, &sb);
228 if (!S_ISDIR(sb.st_mode))
232 * If this is the first read, get the zap type.
234 if (fp->f_seekp == 0) {
235 rc = dnode_read(spa, &fp->f_dnode,
236 0, &fp->f_zap_type, sizeof(fp->f_zap_type));
240 if (fp->f_zap_type == ZBT_MICRO) {
241 fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
243 rc = dnode_read(spa, &fp->f_dnode,
244 offsetof(zap_phys_t, zap_num_leafs),
246 sizeof(fp->f_num_leafs));
251 fp->f_zap_leaf = malloc(bsize);
252 if (fp->f_zap_leaf == NULL)
254 rc = dnode_read(spa, &fp->f_dnode,
263 if (fp->f_zap_type == ZBT_MICRO) {
265 if (fp->f_seekp >= bsize)
268 rc = dnode_read(spa, &fp->f_dnode,
269 fp->f_seekp, &mze, sizeof(mze));
272 fp->f_seekp += sizeof(mze);
274 if (!mze.mze_name[0])
277 d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
278 d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
279 strcpy(d->d_name, mze.mze_name);
280 d->d_namlen = strlen(d->d_name);
284 zap_leaf_chunk_t *zc, *nc;
291 * Initialise this so we can use the ZAP size
292 * calculating macros.
294 zl.l_bs = ilog2(bsize);
295 zl.l_phys = fp->f_zap_leaf;
298 * Figure out which chunk we are currently looking at
299 * and consider seeking to the next leaf. We use the
300 * low bits of f_seekp as a simple chunk index.
303 chunk = fp->f_seekp & (bsize - 1);
304 if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
305 fp->f_seekp = rounddown2(fp->f_seekp, bsize) + bsize;
309 * Check for EOF and read the new leaf.
311 if (fp->f_seekp >= bsize * fp->f_num_leafs)
314 rc = dnode_read(spa, &fp->f_dnode,
322 zc = &ZAP_LEAF_CHUNK(&zl, chunk);
324 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
327 namelen = zc->l_entry.le_name_numints;
328 if (namelen > sizeof(d->d_name))
329 namelen = sizeof(d->d_name);
332 * Paste the name back together.
334 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
336 while (namelen > 0) {
339 if (len > ZAP_LEAF_ARRAY_BYTES)
340 len = ZAP_LEAF_ARRAY_BYTES;
341 memcpy(p, nc->l_array.la_array, len);
344 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
346 d->d_name[sizeof(d->d_name) - 1] = 0;
349 * Assume the first eight bytes of the value are
352 value = fzap_leaf_value(&zl, zc);
354 d->d_fileno = ZFS_DIRENT_OBJ(value);
355 d->d_type = ZFS_DIRENT_TYPE(value);
356 d->d_namlen = strlen(d->d_name);
363 vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t bytes)
366 size_t res, head, tail, total_size, full_sec_size;
367 unsigned secsz, do_tail_read;
369 char *outbuf, *bouncebuf;
371 fd = (uintptr_t) priv;
372 outbuf = (char *) buf;
375 ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
380 * Handling reads of arbitrary offset and size - multi-sector case
381 * and single-sector case.
384 * (do_tail_read = true if tail > 0)
386 * |<----------------------total_size--------------------->|
388 * |<--head-->|<--------------bytes------------>|<--tail-->|
390 * | | |<~full_sec_size~>| | |
391 * +------------------+ +------------------+
392 * | |0101010| . . . |0101011| |
393 * +------------------+ +------------------+
394 * start_sec start_sec + n
398 * (do_tail_read = false)
400 * |<------total_size = secsz----->|
402 * |<-head->|<---bytes--->|<-tail->|
403 * +-------------------------------+
404 * | |0101010101010| |
405 * +-------------------------------+
408 start_sec = offset / secsz;
409 head = offset % secsz;
410 total_size = roundup2(head + bytes, secsz);
411 tail = total_size - (head + bytes);
412 do_tail_read = ((tail > 0) && (head + bytes > secsz));
413 full_sec_size = total_size;
415 full_sec_size -= secsz;
417 full_sec_size -= secsz;
419 /* Return of partial sector data requires a bounce buffer. */
420 if ((head > 0) || do_tail_read || bytes < secsz) {
421 bouncebuf = malloc(secsz);
422 if (bouncebuf == NULL) {
423 printf("vdev_read: out of memory\n");
428 if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) {
433 /* Partial data return from first sector */
435 res = read(fd, bouncebuf, secsz);
440 memcpy(outbuf, bouncebuf + head, min(secsz - head, bytes));
441 outbuf += min(secsz - head, bytes);
445 * Full data return from read sectors.
446 * Note, there is still corner case where we read
447 * from sector boundary, but less than sector size, e.g. reading 512B
450 if (full_sec_size > 0) {
451 if (bytes < full_sec_size) {
452 res = read(fd, bouncebuf, secsz);
457 memcpy(outbuf, bouncebuf, bytes);
459 res = read(fd, outbuf, full_sec_size);
460 if (res != full_sec_size) {
464 outbuf += full_sec_size;
468 /* Partial data return from last sector */
470 res = read(fd, bouncebuf, secsz);
475 memcpy(outbuf, bouncebuf, secsz - tail);
485 vdev_write(vdev_t *vdev __unused, void *priv, off_t offset, void *buf,
489 size_t head, tail, total_size, full_sec_size;
490 unsigned secsz, do_tail_write;
493 char *outbuf, *bouncebuf;
495 fd = (uintptr_t)priv;
496 outbuf = (char *) buf;
499 ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
503 start_sec = offset / secsz;
504 head = offset % secsz;
505 total_size = roundup2(head + bytes, secsz);
506 tail = total_size - (head + bytes);
507 do_tail_write = ((tail > 0) && (head + bytes > secsz));
508 full_sec_size = total_size;
510 full_sec_size -= secsz;
512 full_sec_size -= secsz;
514 /* Partial sector write requires a bounce buffer. */
515 if ((head > 0) || do_tail_write || bytes < secsz) {
516 bouncebuf = malloc(secsz);
517 if (bouncebuf == NULL) {
518 printf("vdev_write: out of memory\n");
523 if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) {
528 /* Partial data for first sector */
530 res = read(fd, bouncebuf, secsz);
535 memcpy(bouncebuf + head, outbuf, min(secsz - head, bytes));
536 (void) lseek(fd, -secsz, SEEK_CUR);
537 res = write(fd, bouncebuf, secsz);
542 outbuf += min(secsz - head, bytes);
546 * Full data write to sectors.
547 * Note, there is still corner case where we write
548 * to sector boundary, but less than sector size, e.g. write 512B
551 if (full_sec_size > 0) {
552 if (bytes < full_sec_size) {
553 res = read(fd, bouncebuf, secsz);
558 memcpy(bouncebuf, outbuf, bytes);
559 (void) lseek(fd, -secsz, SEEK_CUR);
560 res = write(fd, bouncebuf, secsz);
566 res = write(fd, outbuf, full_sec_size);
567 if (res != full_sec_size) {
571 outbuf += full_sec_size;
575 /* Partial data write to last sector */
577 res = read(fd, bouncebuf, secsz);
582 memcpy(bouncebuf, outbuf, secsz - tail);
583 (void) lseek(fd, -secsz, SEEK_CUR);
584 res = write(fd, bouncebuf, secsz);
598 vdev_clear_pad2(vdev_t *vdev)
601 vdev_boot_envblock_t *be;
602 off_t off = offsetof(vdev_label_t, vl_be);
603 zio_checksum_info_t *ci;
606 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
607 if (kid->v_state != VDEV_STATE_HEALTHY)
609 vdev_clear_pad2(kid);
612 if (!STAILQ_EMPTY(&vdev->v_children))
615 be = calloc(1, sizeof (*be));
617 printf("failed to clear be area: out of memory\n");
621 ci = &zio_checksum_table[ZIO_CHECKSUM_LABEL];
622 be->vbe_zbt.zec_magic = ZEC_MAGIC;
623 zio_checksum_label_verifier(&be->vbe_zbt.zec_cksum, off);
624 ci->ci_func[0](be, sizeof (*be), NULL, &cksum);
625 be->vbe_zbt.zec_cksum = cksum;
627 if (vdev_write(vdev, vdev->v_read_priv, off, be, VDEV_PAD_SIZE)) {
628 printf("failed to clear be area of primary vdev: %d\n",
635 * Read the next boot command from pad2.
636 * If any instance of pad2 is set to empty string, or the returned string
637 * values are not the same, we consider next boot not to be set.
640 vdev_read_pad2(vdev_t *vdev)
643 char *tmp, *result = NULL;
644 vdev_boot_envblock_t *be;
645 off_t off = offsetof(vdev_label_t, vl_be);
647 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
648 if (kid->v_state != VDEV_STATE_HEALTHY)
650 tmp = vdev_read_pad2(kid);
654 /* The next boot is not set, we are done. */
659 if (result == NULL) {
663 /* Are the next boot strings different? */
664 if (strcmp(result, tmp) != 0) {
674 be = malloc(sizeof (*be));
678 if (vdev_read(vdev, vdev->v_read_priv, off, be, sizeof (*be))) {
682 switch (be->vbe_version) {
685 result = strdup(be->vbe_bootenv);
687 /* Backward compatibility with initial nextboot feaure. */
688 result = strdup((char *)be);
701 if (archsw.arch_zfs_probe == NULL)
703 archsw.arch_zfs_probe();
706 spa = STAILQ_FIRST(&zfs_pools);
707 while (spa != NULL) {
708 next = STAILQ_NEXT(spa, spa_link);
709 if (zfs_spa_init(spa)) {
711 STAILQ_REMOVE_HEAD(&zfs_pools, spa_link);
713 STAILQ_REMOVE_AFTER(&zfs_pools, prev, spa_link);
721 struct zfs_probe_args {
729 zfs_diskread(void *arg, void *buf, size_t blocks, uint64_t offset)
731 struct zfs_probe_args *ppa;
733 ppa = (struct zfs_probe_args *)arg;
734 return (vdev_read(NULL, (void *)(uintptr_t)ppa->fd,
735 offset * ppa->secsz, buf, blocks * ppa->secsz));
739 zfs_probe(int fd, uint64_t *pool_guid)
745 ret = vdev_probe(vdev_read, (void *)(uintptr_t)fd, &spa);
746 if (ret == 0 && pool_guid != NULL)
748 *pool_guid = spa->spa_guid;
753 zfs_probe_partition(void *arg, const char *partname,
754 const struct ptable_entry *part)
756 struct zfs_probe_args *ppa, pa;
757 struct ptable *table;
761 /* Probe only freebsd-zfs and freebsd partitions */
762 if (part->type != PART_FREEBSD &&
763 part->type != PART_FREEBSD_ZFS)
766 ppa = (struct zfs_probe_args *)arg;
767 strncpy(devname, ppa->devname, strlen(ppa->devname) - 1);
768 devname[strlen(ppa->devname) - 1] = '\0';
769 sprintf(devname, "%s%s:", devname, partname);
770 pa.fd = open(devname, O_RDWR);
773 ret = zfs_probe(pa.fd, ppa->pool_guid);
776 /* Do we have BSD label here? */
777 if (part->type == PART_FREEBSD) {
778 pa.devname = devname;
779 pa.pool_guid = ppa->pool_guid;
780 pa.secsz = ppa->secsz;
781 table = ptable_open(&pa, part->end - part->start + 1,
782 ppa->secsz, zfs_diskread);
784 ptable_iterate(table, &pa, zfs_probe_partition);
793 zfs_nextboot(void *vdev, char *buf, size_t size)
795 struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev;
800 if (dev->dd.d_dev->dv_type != DEVT_ZFS)
803 if (dev->pool_guid == 0)
804 spa = STAILQ_FIRST(&zfs_pools);
806 spa = spa_find_by_guid(dev->pool_guid);
809 printf("ZFS: can't find pool by guid\n");
813 STAILQ_FOREACH(vd, &spa->spa_root_vdev->v_children, v_childlink) {
814 char *tmp = vdev_read_pad2(vd);
816 /* Continue on error. */
819 /* Nextboot is not set. */
825 if (result == NULL) {
834 STAILQ_FOREACH(vd, &spa->spa_root_vdev->v_children, v_childlink) {
838 strlcpy(buf, result, size);
844 zfs_probe_dev(const char *devname, uint64_t *pool_guid)
846 struct ptable *table;
847 struct zfs_probe_args pa;
853 pa.fd = open(devname, O_RDWR);
856 /* Probe the whole disk */
857 ret = zfs_probe(pa.fd, pool_guid);
861 /* Probe each partition */
862 ret = ioctl(pa.fd, DIOCGMEDIASIZE, &mediasz);
864 ret = ioctl(pa.fd, DIOCGSECTORSIZE, &pa.secsz);
866 pa.devname = devname;
867 pa.pool_guid = pool_guid;
868 table = ptable_open(&pa, mediasz / pa.secsz, pa.secsz,
871 ptable_iterate(table, &pa, zfs_probe_partition);
876 if (pool_guid && *pool_guid == 0)
882 * Print information about ZFS pools
885 zfs_dev_print(int verbose)
891 if (STAILQ_EMPTY(&zfs_pools))
894 printf("%s devices:", zfs_dev.dv_name);
895 if ((ret = pager_output("\n")) != 0)
899 return (spa_all_status());
901 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
902 snprintf(line, sizeof(line), " zfs:%s\n", spa->spa_name);
903 ret = pager_output(line);
911 * Attempt to open the pool described by (dev) for use by (f).
914 zfs_dev_open(struct open_file *f, ...)
917 struct zfs_devdesc *dev;
918 struct zfsmount *mount;
923 dev = va_arg(args, struct zfs_devdesc *);
926 if (dev->pool_guid == 0)
927 spa = STAILQ_FIRST(&zfs_pools);
929 spa = spa_find_by_guid(dev->pool_guid);
932 mount = malloc(sizeof(*mount));
936 rv = zfs_mount(spa, dev->root_guid, mount);
941 if (mount->objset.os_type != DMU_OST_ZFS) {
942 printf("Unexpected object set type %ju\n",
943 (uintmax_t)mount->objset.os_type);
947 f->f_devdata = mount;
953 zfs_dev_close(struct open_file *f)
962 zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
968 struct devsw zfs_dev = {
971 .dv_init = zfs_dev_init,
972 .dv_strategy = zfs_dev_strategy,
973 .dv_open = zfs_dev_open,
974 .dv_close = zfs_dev_close,
976 .dv_print = zfs_dev_print,
981 zfs_parsedev(struct zfs_devdesc *dev, const char *devspec, const char **path)
983 static char rootname[ZFS_MAXNAMELEN];
984 static char poolname[ZFS_MAXNAMELEN];
995 end = strrchr(np, ':');
998 sep = strchr(np, '/');
999 if (sep == NULL || sep >= end)
1001 memcpy(poolname, np, sep - np);
1002 poolname[sep - np] = '\0';
1005 memcpy(rootname, sep, end - sep);
1006 rootname[end - sep] = '\0';
1011 spa = spa_find_by_name(poolname);
1014 dev->pool_guid = spa->spa_guid;
1015 rv = zfs_lookup_dataset(spa, rootname, &dev->root_guid);
1019 *path = (*end == '\0') ? end : end + 1;
1020 dev->dd.d_dev = &zfs_dev;
1025 zfs_fmtdev(void *vdev)
1027 static char rootname[ZFS_MAXNAMELEN];
1028 static char buf[2 * ZFS_MAXNAMELEN + 8];
1029 struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev;
1033 if (dev->dd.d_dev->dv_type != DEVT_ZFS)
1036 /* Do we have any pools? */
1037 spa = STAILQ_FIRST(&zfs_pools);
1041 if (dev->pool_guid == 0)
1042 dev->pool_guid = spa->spa_guid;
1044 spa = spa_find_by_guid(dev->pool_guid);
1047 printf("ZFS: can't find pool by guid\n");
1050 if (dev->root_guid == 0 && zfs_get_root(spa, &dev->root_guid)) {
1051 printf("ZFS: can't find root filesystem\n");
1054 if (zfs_rlookup(spa, dev->root_guid, rootname)) {
1055 printf("ZFS: can't find filesystem by guid\n");
1059 if (rootname[0] == '\0')
1060 sprintf(buf, "%s:%s:", dev->dd.d_dev->dv_name, spa->spa_name);
1062 sprintf(buf, "%s:%s/%s:", dev->dd.d_dev->dv_name, spa->spa_name,
1068 zfs_list(const char *name)
1070 static char poolname[ZFS_MAXNAMELEN];
1078 dsname = strchr(name, '/');
1079 if (dsname != NULL) {
1080 len = dsname - name;
1084 memcpy(poolname, name, len);
1085 poolname[len] = '\0';
1087 spa = spa_find_by_name(poolname);
1090 rv = zfs_lookup_dataset(spa, dsname, &objid);
1094 return (zfs_list_dataset(spa, objid));
1098 init_zfs_bootenv(const char *currdev_in)
1100 char *beroot, *currdev;
1104 currdev_len = strlen(currdev_in);
1105 if (currdev_len == 0)
1107 if (strncmp(currdev_in, "zfs:", 4) != 0)
1109 currdev = strdup(currdev_in);
1110 if (currdev == NULL)
1112 /* Remove the trailing : */
1113 currdev[currdev_len - 1] = '\0';
1114 setenv("zfs_be_active", currdev, 1);
1115 setenv("zfs_be_currpage", "1", 1);
1116 /* Remove the last element (current bootenv) */
1117 beroot = strrchr(currdev, '/');
1120 beroot = strchr(currdev, ':') + 1;
1121 setenv("zfs_be_root", beroot, 1);
1122 zfs_bootenv_initial(beroot);
1127 zfs_bootenv_initial(const char *name)
1129 char poolname[ZFS_MAXNAMELEN], *dsname;
1130 char envname[32], envval[256];
1133 int bootenvs_idx, len, rv;
1135 SLIST_INIT(&zfs_be_head);
1138 dsname = strchr(name, '/');
1139 if (dsname != NULL) {
1140 len = dsname - name;
1144 strlcpy(poolname, name, len + 1);
1145 spa = spa_find_by_name(poolname);
1148 rv = zfs_lookup_dataset(spa, dsname, &objid);
1151 rv = zfs_callback_dataset(spa, objid, zfs_belist_add);
1153 /* Populate the initial environment variables */
1154 SLIST_FOREACH_SAFE(zfs_be, &zfs_be_head, entries, zfs_be_tmp) {
1155 /* Enumerate all bootenvs for general usage */
1156 snprintf(envname, sizeof(envname), "bootenvs[%d]", bootenvs_idx);
1157 snprintf(envval, sizeof(envval), "zfs:%s/%s", name, zfs_be->name);
1158 rv = setenv(envname, envval, 1);
1163 snprintf(envval, sizeof(envval), "%d", bootenvs_idx);
1164 setenv("bootenvs_count", envval, 1);
1166 /* Clean up the SLIST of ZFS BEs */
1167 while (!SLIST_EMPTY(&zfs_be_head)) {
1168 zfs_be = SLIST_FIRST(&zfs_be_head);
1169 SLIST_REMOVE_HEAD(&zfs_be_head, entries);
1179 zfs_bootenv(const char *name)
1181 static char poolname[ZFS_MAXNAMELEN], *dsname, *root;
1185 int len, rv, pages, perpage, currpage;
1189 if ((root = getenv("zfs_be_root")) == NULL)
1192 if (strcmp(name, root) != 0) {
1193 if (setenv("zfs_be_root", name, 1) != 0)
1197 SLIST_INIT(&zfs_be_head);
1200 dsname = strchr(name, '/');
1201 if (dsname != NULL) {
1202 len = dsname - name;
1206 memcpy(poolname, name, len);
1207 poolname[len] = '\0';
1209 spa = spa_find_by_name(poolname);
1212 rv = zfs_lookup_dataset(spa, dsname, &objid);
1215 rv = zfs_callback_dataset(spa, objid, zfs_belist_add);
1217 /* Calculate and store the number of pages of BEs */
1218 perpage = (ZFS_BE_LAST - ZFS_BE_FIRST + 1);
1219 pages = (zfs_env_count / perpage) + ((zfs_env_count % perpage) > 0 ? 1 : 0);
1220 snprintf(becount, 4, "%d", pages);
1221 if (setenv("zfs_be_pages", becount, 1) != 0)
1224 /* Roll over the page counter if it has exceeded the maximum */
1225 currpage = strtol(getenv("zfs_be_currpage"), NULL, 10);
1226 if (currpage > pages) {
1227 if (setenv("zfs_be_currpage", "1", 1) != 0)
1231 /* Populate the menu environment variables */
1234 /* Clean up the SLIST of ZFS BEs */
1235 while (!SLIST_EMPTY(&zfs_be_head)) {
1236 zfs_be = SLIST_FIRST(&zfs_be_head);
1237 SLIST_REMOVE_HEAD(&zfs_be_head, entries);
1246 zfs_belist_add(const char *name, uint64_t value __unused)
1249 /* Skip special datasets that start with a $ character */
1250 if (strncmp(name, "$", 1) == 0) {
1253 /* Add the boot environment to the head of the SLIST */
1254 zfs_be = malloc(sizeof(struct zfs_be_entry));
1255 if (zfs_be == NULL) {
1258 zfs_be->name = strdup(name);
1259 if (zfs_be->name == NULL) {
1263 SLIST_INSERT_HEAD(&zfs_be_head, zfs_be, entries);
1272 char envname[32], envval[256];
1273 char *beroot, *pagenum;
1276 beroot = getenv("zfs_be_root");
1277 if (beroot == NULL) {
1281 pagenum = getenv("zfs_be_currpage");
1282 if (pagenum != NULL) {
1283 page = strtol(pagenum, NULL, 10);
1290 zfs_env_index = ZFS_BE_FIRST;
1291 SLIST_FOREACH_SAFE(zfs_be, &zfs_be_head, entries, zfs_be_tmp) {
1292 /* Skip to the requested page number */
1293 if (ctr <= ((ZFS_BE_LAST - ZFS_BE_FIRST + 1) * (page - 1))) {
1298 snprintf(envname, sizeof(envname), "bootenvmenu_caption[%d]", zfs_env_index);
1299 snprintf(envval, sizeof(envval), "%s", zfs_be->name);
1300 rv = setenv(envname, envval, 1);
1305 snprintf(envname, sizeof(envname), "bootenvansi_caption[%d]", zfs_env_index);
1306 rv = setenv(envname, envval, 1);
1311 snprintf(envname, sizeof(envname), "bootenvmenu_command[%d]", zfs_env_index);
1312 rv = setenv(envname, "set_bootenv", 1);
1317 snprintf(envname, sizeof(envname), "bootenv_root[%d]", zfs_env_index);
1318 snprintf(envval, sizeof(envval), "zfs:%s/%s", beroot, zfs_be->name);
1319 rv = setenv(envname, envval, 1);
1325 if (zfs_env_index > ZFS_BE_LAST) {
1331 for (; zfs_env_index <= ZFS_BE_LAST; zfs_env_index++) {
1332 snprintf(envname, sizeof(envname), "bootenvmenu_caption[%d]", zfs_env_index);
1333 (void)unsetenv(envname);
1334 snprintf(envname, sizeof(envname), "bootenvansi_caption[%d]", zfs_env_index);
1335 (void)unsetenv(envname);
1336 snprintf(envname, sizeof(envname), "bootenvmenu_command[%d]", zfs_env_index);
1337 (void)unsetenv(envname);
1338 snprintf(envname, sizeof(envname), "bootenv_root[%d]", zfs_env_index);
1339 (void)unsetenv(envname);