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>
46 #include <bootstrap.h>
52 /* Define the range of indexes to be populated with ZFS Boot Environments */
53 #define ZFS_BE_FIRST 4
56 static int zfs_open(const char *path, struct open_file *f);
57 static int zfs_close(struct open_file *f);
58 static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
59 static off_t zfs_seek(struct open_file *f, off_t offset, int where);
60 static int zfs_stat(struct open_file *f, struct stat *sb);
61 static int zfs_readdir(struct open_file *f, struct dirent *d);
63 static void zfs_bootenv_initial(const char *);
67 struct fs_ops zfs_fsops = {
82 off_t f_seekp; /* seek pointer */
84 uint64_t f_zap_type; /* zap type for readdir */
85 uint64_t f_num_leafs; /* number of fzap leaf blocks */
86 zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
89 static int zfs_env_index;
90 static int zfs_env_count;
92 SLIST_HEAD(zfs_be_list, zfs_be_entry) zfs_be_head = SLIST_HEAD_INITIALIZER(zfs_be_head);
93 struct zfs_be_list *zfs_be_headp;
96 SLIST_ENTRY(zfs_be_entry) entries;
97 } *zfs_be, *zfs_be_tmp;
103 zfs_open(const char *upath, struct open_file *f)
105 struct zfsmount *mount = (struct zfsmount *)f->f_devdata;
109 if (f->f_dev != &zfs_dev)
112 /* allocate file system specific data structure */
113 fp = calloc(1, sizeof(struct file));
118 rc = zfs_lookup(mount, upath, &fp->f_dnode);
128 zfs_close(struct open_file *f)
130 struct file *fp = (struct file *)f->f_fsdata;
132 dnode_cache_obj = NULL;
140 * Copy a portion of a file into kernel memory.
141 * Cross block boundaries when necessary.
144 zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
146 const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
147 struct file *fp = (struct file *)f->f_fsdata;
152 rc = zfs_stat(f, &sb);
156 if (fp->f_seekp + n > sb.st_size)
157 n = sb.st_size - fp->f_seekp;
159 rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
165 for (i = 0; i < n; i++)
166 putchar(((char*) start)[i]);
176 zfs_seek(struct open_file *f, off_t offset, int where)
178 struct file *fp = (struct file *)f->f_fsdata;
182 fp->f_seekp = offset;
185 fp->f_seekp += offset;
192 error = zfs_stat(f, &sb);
197 fp->f_seekp = sb.st_size - offset;
204 return (fp->f_seekp);
208 zfs_stat(struct open_file *f, struct stat *sb)
210 const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
211 struct file *fp = (struct file *)f->f_fsdata;
213 return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
217 zfs_readdir(struct open_file *f, struct dirent *d)
219 const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
220 struct file *fp = (struct file *)f->f_fsdata;
223 size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
226 rc = zfs_stat(f, &sb);
229 if (!S_ISDIR(sb.st_mode))
233 * If this is the first read, get the zap type.
235 if (fp->f_seekp == 0) {
236 rc = dnode_read(spa, &fp->f_dnode,
237 0, &fp->f_zap_type, sizeof(fp->f_zap_type));
241 if (fp->f_zap_type == ZBT_MICRO) {
242 fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
244 rc = dnode_read(spa, &fp->f_dnode,
245 offsetof(zap_phys_t, zap_num_leafs),
247 sizeof(fp->f_num_leafs));
252 fp->f_zap_leaf = malloc(bsize);
253 if (fp->f_zap_leaf == NULL)
255 rc = dnode_read(spa, &fp->f_dnode,
264 if (fp->f_zap_type == ZBT_MICRO) {
266 if (fp->f_seekp >= bsize)
269 rc = dnode_read(spa, &fp->f_dnode,
270 fp->f_seekp, &mze, sizeof(mze));
273 fp->f_seekp += sizeof(mze);
275 if (!mze.mze_name[0])
278 d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
279 d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
280 strcpy(d->d_name, mze.mze_name);
281 d->d_namlen = strlen(d->d_name);
285 zap_leaf_chunk_t *zc, *nc;
292 * Initialise this so we can use the ZAP size
293 * calculating macros.
295 zl.l_bs = ilog2(bsize);
296 zl.l_phys = fp->f_zap_leaf;
299 * Figure out which chunk we are currently looking at
300 * and consider seeking to the next leaf. We use the
301 * low bits of f_seekp as a simple chunk index.
304 chunk = fp->f_seekp & (bsize - 1);
305 if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
306 fp->f_seekp = rounddown2(fp->f_seekp, bsize) + bsize;
310 * Check for EOF and read the new leaf.
312 if (fp->f_seekp >= bsize * fp->f_num_leafs)
315 rc = dnode_read(spa, &fp->f_dnode,
323 zc = &ZAP_LEAF_CHUNK(&zl, chunk);
325 if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
328 namelen = zc->l_entry.le_name_numints;
329 if (namelen > sizeof(d->d_name))
330 namelen = sizeof(d->d_name);
333 * Paste the name back together.
335 nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
337 while (namelen > 0) {
340 if (len > ZAP_LEAF_ARRAY_BYTES)
341 len = ZAP_LEAF_ARRAY_BYTES;
342 memcpy(p, nc->l_array.la_array, len);
345 nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
347 d->d_name[sizeof(d->d_name) - 1] = 0;
350 * Assume the first eight bytes of the value are
353 value = fzap_leaf_value(&zl, zc);
355 d->d_fileno = ZFS_DIRENT_OBJ(value);
356 d->d_type = ZFS_DIRENT_TYPE(value);
357 d->d_namlen = strlen(d->d_name);
364 vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t bytes)
367 size_t res, head, tail, total_size, full_sec_size;
368 unsigned secsz, do_tail_read;
370 char *outbuf, *bouncebuf;
372 fd = (uintptr_t) priv;
373 outbuf = (char *) buf;
376 ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
381 * Handling reads of arbitrary offset and size - multi-sector case
382 * and single-sector case.
385 * (do_tail_read = true if tail > 0)
387 * |<----------------------total_size--------------------->|
389 * |<--head-->|<--------------bytes------------>|<--tail-->|
391 * | | |<~full_sec_size~>| | |
392 * +------------------+ +------------------+
393 * | |0101010| . . . |0101011| |
394 * +------------------+ +------------------+
395 * start_sec start_sec + n
399 * (do_tail_read = false)
401 * |<------total_size = secsz----->|
403 * |<-head->|<---bytes--->|<-tail->|
404 * +-------------------------------+
405 * | |0101010101010| |
406 * +-------------------------------+
409 start_sec = offset / secsz;
410 head = offset % secsz;
411 total_size = roundup2(head + bytes, secsz);
412 tail = total_size - (head + bytes);
413 do_tail_read = ((tail > 0) && (head + bytes > secsz));
414 full_sec_size = total_size;
416 full_sec_size -= secsz;
418 full_sec_size -= secsz;
420 /* Return of partial sector data requires a bounce buffer. */
421 if ((head > 0) || do_tail_read || bytes < secsz) {
422 bouncebuf = malloc(secsz);
423 if (bouncebuf == NULL) {
424 printf("vdev_read: out of memory\n");
429 if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) {
434 /* Partial data return from first sector */
436 res = read(fd, bouncebuf, secsz);
441 memcpy(outbuf, bouncebuf + head, min(secsz - head, bytes));
442 outbuf += min(secsz - head, bytes);
446 * Full data return from read sectors.
447 * Note, there is still corner case where we read
448 * from sector boundary, but less than sector size, e.g. reading 512B
451 if (full_sec_size > 0) {
452 if (bytes < full_sec_size) {
453 res = read(fd, bouncebuf, secsz);
458 memcpy(outbuf, bouncebuf, bytes);
460 res = read(fd, outbuf, full_sec_size);
461 if (res != full_sec_size) {
465 outbuf += full_sec_size;
469 /* Partial data return from last sector */
471 res = read(fd, bouncebuf, secsz);
476 memcpy(outbuf, bouncebuf, secsz - tail);
486 vdev_write(vdev_t *vdev __unused, void *priv, off_t offset, void *buf,
490 size_t head, tail, total_size, full_sec_size;
491 unsigned secsz, do_tail_write;
494 char *outbuf, *bouncebuf;
496 fd = (uintptr_t)priv;
497 outbuf = (char *) buf;
500 ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
504 start_sec = offset / secsz;
505 head = offset % secsz;
506 total_size = roundup2(head + bytes, secsz);
507 tail = total_size - (head + bytes);
508 do_tail_write = ((tail > 0) && (head + bytes > secsz));
509 full_sec_size = total_size;
511 full_sec_size -= secsz;
513 full_sec_size -= secsz;
515 /* Partial sector write requires a bounce buffer. */
516 if ((head > 0) || do_tail_write || bytes < secsz) {
517 bouncebuf = malloc(secsz);
518 if (bouncebuf == NULL) {
519 printf("vdev_write: out of memory\n");
524 if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) {
529 /* Partial data for first sector */
531 res = read(fd, bouncebuf, secsz);
536 memcpy(bouncebuf + head, outbuf, min(secsz - head, bytes));
537 (void) lseek(fd, -secsz, SEEK_CUR);
538 res = write(fd, bouncebuf, secsz);
543 outbuf += min(secsz - head, bytes);
547 * Full data write to sectors.
548 * Note, there is still corner case where we write
549 * to sector boundary, but less than sector size, e.g. write 512B
552 if (full_sec_size > 0) {
553 if (bytes < full_sec_size) {
554 res = read(fd, bouncebuf, secsz);
559 memcpy(bouncebuf, outbuf, bytes);
560 (void) lseek(fd, -secsz, SEEK_CUR);
561 res = write(fd, bouncebuf, secsz);
567 res = write(fd, outbuf, full_sec_size);
568 if (res != full_sec_size) {
572 outbuf += full_sec_size;
576 /* Partial data write to last sector */
578 res = read(fd, bouncebuf, secsz);
583 memcpy(bouncebuf, outbuf, secsz - tail);
584 (void) lseek(fd, -secsz, SEEK_CUR);
585 res = write(fd, bouncebuf, secsz);
599 vdev_clear_pad2(vdev_t *vdev)
602 vdev_boot_envblock_t *be;
603 off_t off = offsetof(vdev_label_t, vl_be);
604 zio_checksum_info_t *ci;
607 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
608 if (kid->v_state != VDEV_STATE_HEALTHY)
610 vdev_clear_pad2(kid);
613 if (!STAILQ_EMPTY(&vdev->v_children))
616 be = calloc(1, sizeof (*be));
618 printf("failed to clear be area: out of memory\n");
622 ci = &zio_checksum_table[ZIO_CHECKSUM_LABEL];
623 be->vbe_zbt.zec_magic = ZEC_MAGIC;
624 zio_checksum_label_verifier(&be->vbe_zbt.zec_cksum, off);
625 ci->ci_func[0](be, sizeof (*be), NULL, &cksum);
626 be->vbe_zbt.zec_cksum = cksum;
628 if (vdev_write(vdev, vdev->v_read_priv, off, be, VDEV_PAD_SIZE)) {
629 printf("failed to clear be area of primary vdev: %d\n",
636 * Read the next boot command from pad2.
637 * If any instance of pad2 is set to empty string, or the returned string
638 * values are not the same, we consider next boot not to be set.
641 vdev_read_pad2(vdev_t *vdev)
644 char *tmp, *result = NULL;
645 vdev_boot_envblock_t *be;
646 off_t off = offsetof(vdev_label_t, vl_be);
648 STAILQ_FOREACH(kid, &vdev->v_children, v_childlink) {
649 if (kid->v_state != VDEV_STATE_HEALTHY)
651 tmp = vdev_read_pad2(kid);
655 /* The next boot is not set, we are done. */
660 if (result == NULL) {
664 /* Are the next boot strings different? */
665 if (strcmp(result, tmp) != 0) {
675 be = malloc(sizeof (*be));
679 if (vdev_read(vdev, vdev->v_read_priv, off, be, sizeof (*be))) {
683 switch (be->vbe_version) {
686 result = strdup(be->vbe_bootenv);
688 /* Backward compatibility with initial nextboot feaure. */
689 result = strdup((char *)be);
702 if (archsw.arch_zfs_probe == NULL)
704 archsw.arch_zfs_probe();
707 spa = STAILQ_FIRST(&zfs_pools);
708 while (spa != NULL) {
709 next = STAILQ_NEXT(spa, spa_link);
710 if (zfs_spa_init(spa)) {
712 STAILQ_REMOVE_HEAD(&zfs_pools, spa_link);
714 STAILQ_REMOVE_AFTER(&zfs_pools, prev, spa_link);
722 struct zfs_probe_args {
730 zfs_diskread(void *arg, void *buf, size_t blocks, uint64_t offset)
732 struct zfs_probe_args *ppa;
734 ppa = (struct zfs_probe_args *)arg;
735 return (vdev_read(NULL, (void *)(uintptr_t)ppa->fd,
736 offset * ppa->secsz, buf, blocks * ppa->secsz));
740 zfs_probe(int fd, uint64_t *pool_guid)
746 ret = vdev_probe(vdev_read, (void *)(uintptr_t)fd, &spa);
747 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 disk_devdesc *dev;
847 struct ptable *table;
848 struct zfs_probe_args pa;
854 pa.fd = open(devname, O_RDWR);
858 * We will not probe the whole disk, we can not boot from such
859 * disks and some systems will misreport the disk sizes and will
860 * hang while accessing the disk.
862 if (archsw.arch_getdev((void **)&dev, devname, NULL) == 0) {
863 int partition = dev->d_partition;
864 int slice = dev->d_slice;
867 if (partition != D_PARTNONE && slice != D_SLICENONE) {
868 ret = zfs_probe(pa.fd, pool_guid);
874 /* Probe each partition */
875 ret = ioctl(pa.fd, DIOCGMEDIASIZE, &mediasz);
877 ret = ioctl(pa.fd, DIOCGSECTORSIZE, &pa.secsz);
879 pa.devname = devname;
880 pa.pool_guid = pool_guid;
881 table = ptable_open(&pa, mediasz / pa.secsz, pa.secsz,
884 ptable_iterate(table, &pa, zfs_probe_partition);
889 if (pool_guid && *pool_guid == 0)
895 * Print information about ZFS pools
898 zfs_dev_print(int verbose)
904 if (STAILQ_EMPTY(&zfs_pools))
907 printf("%s devices:", zfs_dev.dv_name);
908 if ((ret = pager_output("\n")) != 0)
912 return (spa_all_status());
914 STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
915 snprintf(line, sizeof(line), " zfs:%s\n", spa->spa_name);
916 ret = pager_output(line);
924 * Attempt to open the pool described by (dev) for use by (f).
927 zfs_dev_open(struct open_file *f, ...)
930 struct zfs_devdesc *dev;
931 struct zfsmount *mount;
936 dev = va_arg(args, struct zfs_devdesc *);
939 if (dev->pool_guid == 0)
940 spa = STAILQ_FIRST(&zfs_pools);
942 spa = spa_find_by_guid(dev->pool_guid);
945 mount = malloc(sizeof(*mount));
949 rv = zfs_mount(spa, dev->root_guid, mount);
954 if (mount->objset.os_type != DMU_OST_ZFS) {
955 printf("Unexpected object set type %ju\n",
956 (uintmax_t)mount->objset.os_type);
960 f->f_devdata = mount;
966 zfs_dev_close(struct open_file *f)
975 zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
981 struct devsw zfs_dev = {
984 .dv_init = zfs_dev_init,
985 .dv_strategy = zfs_dev_strategy,
986 .dv_open = zfs_dev_open,
987 .dv_close = zfs_dev_close,
989 .dv_print = zfs_dev_print,
994 zfs_parsedev(struct zfs_devdesc *dev, const char *devspec, const char **path)
996 static char rootname[ZFS_MAXNAMELEN];
997 static char poolname[ZFS_MAXNAMELEN];
1008 end = strrchr(np, ':');
1011 sep = strchr(np, '/');
1012 if (sep == NULL || sep >= end)
1014 memcpy(poolname, np, sep - np);
1015 poolname[sep - np] = '\0';
1018 memcpy(rootname, sep, end - sep);
1019 rootname[end - sep] = '\0';
1024 spa = spa_find_by_name(poolname);
1027 dev->pool_guid = spa->spa_guid;
1028 rv = zfs_lookup_dataset(spa, rootname, &dev->root_guid);
1032 *path = (*end == '\0') ? end : end + 1;
1033 dev->dd.d_dev = &zfs_dev;
1038 zfs_fmtdev(void *vdev)
1040 static char rootname[ZFS_MAXNAMELEN];
1041 static char buf[2 * ZFS_MAXNAMELEN + 8];
1042 struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev;
1046 if (dev->dd.d_dev->dv_type != DEVT_ZFS)
1049 /* Do we have any pools? */
1050 spa = STAILQ_FIRST(&zfs_pools);
1054 if (dev->pool_guid == 0)
1055 dev->pool_guid = spa->spa_guid;
1057 spa = spa_find_by_guid(dev->pool_guid);
1060 printf("ZFS: can't find pool by guid\n");
1063 if (dev->root_guid == 0 && zfs_get_root(spa, &dev->root_guid)) {
1064 printf("ZFS: can't find root filesystem\n");
1067 if (zfs_rlookup(spa, dev->root_guid, rootname)) {
1068 printf("ZFS: can't find filesystem by guid\n");
1072 if (rootname[0] == '\0')
1073 sprintf(buf, "%s:%s:", dev->dd.d_dev->dv_name, spa->spa_name);
1075 sprintf(buf, "%s:%s/%s:", dev->dd.d_dev->dv_name, spa->spa_name,
1081 zfs_list(const char *name)
1083 static char poolname[ZFS_MAXNAMELEN];
1091 dsname = strchr(name, '/');
1092 if (dsname != NULL) {
1093 len = dsname - name;
1097 memcpy(poolname, name, len);
1098 poolname[len] = '\0';
1100 spa = spa_find_by_name(poolname);
1103 rv = zfs_lookup_dataset(spa, dsname, &objid);
1107 return (zfs_list_dataset(spa, objid));
1111 init_zfs_bootenv(const char *currdev_in)
1113 char *beroot, *currdev;
1117 currdev_len = strlen(currdev_in);
1118 if (currdev_len == 0)
1120 if (strncmp(currdev_in, "zfs:", 4) != 0)
1122 currdev = strdup(currdev_in);
1123 if (currdev == NULL)
1125 /* Remove the trailing : */
1126 currdev[currdev_len - 1] = '\0';
1127 setenv("zfs_be_active", currdev, 1);
1128 setenv("zfs_be_currpage", "1", 1);
1129 /* Remove the last element (current bootenv) */
1130 beroot = strrchr(currdev, '/');
1133 beroot = strchr(currdev, ':') + 1;
1134 setenv("zfs_be_root", beroot, 1);
1135 zfs_bootenv_initial(beroot);
1140 zfs_bootenv_initial(const char *name)
1142 char poolname[ZFS_MAXNAMELEN], *dsname;
1143 char envname[32], envval[256];
1146 int bootenvs_idx, len, rv;
1148 SLIST_INIT(&zfs_be_head);
1151 dsname = strchr(name, '/');
1152 if (dsname != NULL) {
1153 len = dsname - name;
1157 strlcpy(poolname, name, len + 1);
1158 spa = spa_find_by_name(poolname);
1161 rv = zfs_lookup_dataset(spa, dsname, &objid);
1164 rv = zfs_callback_dataset(spa, objid, zfs_belist_add);
1166 /* Populate the initial environment variables */
1167 SLIST_FOREACH_SAFE(zfs_be, &zfs_be_head, entries, zfs_be_tmp) {
1168 /* Enumerate all bootenvs for general usage */
1169 snprintf(envname, sizeof(envname), "bootenvs[%d]", bootenvs_idx);
1170 snprintf(envval, sizeof(envval), "zfs:%s/%s", name, zfs_be->name);
1171 rv = setenv(envname, envval, 1);
1176 snprintf(envval, sizeof(envval), "%d", bootenvs_idx);
1177 setenv("bootenvs_count", envval, 1);
1179 /* Clean up the SLIST of ZFS BEs */
1180 while (!SLIST_EMPTY(&zfs_be_head)) {
1181 zfs_be = SLIST_FIRST(&zfs_be_head);
1182 SLIST_REMOVE_HEAD(&zfs_be_head, entries);
1192 zfs_bootenv(const char *name)
1194 static char poolname[ZFS_MAXNAMELEN], *dsname, *root;
1198 int len, rv, pages, perpage, currpage;
1202 if ((root = getenv("zfs_be_root")) == NULL)
1205 if (strcmp(name, root) != 0) {
1206 if (setenv("zfs_be_root", name, 1) != 0)
1210 SLIST_INIT(&zfs_be_head);
1213 dsname = strchr(name, '/');
1214 if (dsname != NULL) {
1215 len = dsname - name;
1219 memcpy(poolname, name, len);
1220 poolname[len] = '\0';
1222 spa = spa_find_by_name(poolname);
1225 rv = zfs_lookup_dataset(spa, dsname, &objid);
1228 rv = zfs_callback_dataset(spa, objid, zfs_belist_add);
1230 /* Calculate and store the number of pages of BEs */
1231 perpage = (ZFS_BE_LAST - ZFS_BE_FIRST + 1);
1232 pages = (zfs_env_count / perpage) + ((zfs_env_count % perpage) > 0 ? 1 : 0);
1233 snprintf(becount, 4, "%d", pages);
1234 if (setenv("zfs_be_pages", becount, 1) != 0)
1237 /* Roll over the page counter if it has exceeded the maximum */
1238 currpage = strtol(getenv("zfs_be_currpage"), NULL, 10);
1239 if (currpage > pages) {
1240 if (setenv("zfs_be_currpage", "1", 1) != 0)
1244 /* Populate the menu environment variables */
1247 /* Clean up the SLIST of ZFS BEs */
1248 while (!SLIST_EMPTY(&zfs_be_head)) {
1249 zfs_be = SLIST_FIRST(&zfs_be_head);
1250 SLIST_REMOVE_HEAD(&zfs_be_head, entries);
1259 zfs_belist_add(const char *name, uint64_t value __unused)
1262 /* Skip special datasets that start with a $ character */
1263 if (strncmp(name, "$", 1) == 0) {
1266 /* Add the boot environment to the head of the SLIST */
1267 zfs_be = malloc(sizeof(struct zfs_be_entry));
1268 if (zfs_be == NULL) {
1271 zfs_be->name = strdup(name);
1272 if (zfs_be->name == NULL) {
1276 SLIST_INSERT_HEAD(&zfs_be_head, zfs_be, entries);
1285 char envname[32], envval[256];
1286 char *beroot, *pagenum;
1289 beroot = getenv("zfs_be_root");
1290 if (beroot == NULL) {
1294 pagenum = getenv("zfs_be_currpage");
1295 if (pagenum != NULL) {
1296 page = strtol(pagenum, NULL, 10);
1303 zfs_env_index = ZFS_BE_FIRST;
1304 SLIST_FOREACH_SAFE(zfs_be, &zfs_be_head, entries, zfs_be_tmp) {
1305 /* Skip to the requested page number */
1306 if (ctr <= ((ZFS_BE_LAST - ZFS_BE_FIRST + 1) * (page - 1))) {
1311 snprintf(envname, sizeof(envname), "bootenvmenu_caption[%d]", zfs_env_index);
1312 snprintf(envval, sizeof(envval), "%s", zfs_be->name);
1313 rv = setenv(envname, envval, 1);
1318 snprintf(envname, sizeof(envname), "bootenvansi_caption[%d]", zfs_env_index);
1319 rv = setenv(envname, envval, 1);
1324 snprintf(envname, sizeof(envname), "bootenvmenu_command[%d]", zfs_env_index);
1325 rv = setenv(envname, "set_bootenv", 1);
1330 snprintf(envname, sizeof(envname), "bootenv_root[%d]", zfs_env_index);
1331 snprintf(envval, sizeof(envval), "zfs:%s/%s", beroot, zfs_be->name);
1332 rv = setenv(envname, envval, 1);
1338 if (zfs_env_index > ZFS_BE_LAST) {
1344 for (; zfs_env_index <= ZFS_BE_LAST; zfs_env_index++) {
1345 snprintf(envname, sizeof(envname), "bootenvmenu_caption[%d]", zfs_env_index);
1346 (void)unsetenv(envname);
1347 snprintf(envname, sizeof(envname), "bootenvansi_caption[%d]", zfs_env_index);
1348 (void)unsetenv(envname);
1349 snprintf(envname, sizeof(envname), "bootenvmenu_command[%d]", zfs_env_index);
1350 (void)unsetenv(envname);
1351 snprintf(envname, sizeof(envname), "bootenv_root[%d]", zfs_env_index);
1352 (void)unsetenv(envname);