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-rw-r--r--stand/zfs/zfs.c956
1 files changed, 956 insertions, 0 deletions
diff --git a/stand/zfs/zfs.c b/stand/zfs/zfs.c
new file mode 100644
index 0000000000000..0334bddb667a3
--- /dev/null
+++ b/stand/zfs/zfs.c
@@ -0,0 +1,956 @@
+/*-
+ * Copyright (c) 2007 Doug Rabson
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * Stand-alone file reading package.
+ */
+
+#include <sys/disk.h>
+#include <sys/param.h>
+#include <sys/time.h>
+#include <sys/queue.h>
+#include <part.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <string.h>
+#include <stand.h>
+#include <bootstrap.h>
+
+#include "libzfs.h"
+
+#include "zfsimpl.c"
+
+/* Define the range of indexes to be populated with ZFS Boot Environments */
+#define ZFS_BE_FIRST 4
+#define ZFS_BE_LAST 8
+
+static int zfs_open(const char *path, struct open_file *f);
+static int zfs_write(struct open_file *f, void *buf, size_t size, size_t *resid);
+static int zfs_close(struct open_file *f);
+static int zfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
+static off_t zfs_seek(struct open_file *f, off_t offset, int where);
+static int zfs_stat(struct open_file *f, struct stat *sb);
+static int zfs_readdir(struct open_file *f, struct dirent *d);
+
+struct devsw zfs_dev;
+
+struct fs_ops zfs_fsops = {
+ "zfs",
+ zfs_open,
+ zfs_close,
+ zfs_read,
+ zfs_write,
+ zfs_seek,
+ zfs_stat,
+ zfs_readdir
+};
+
+/*
+ * In-core open file.
+ */
+struct file {
+ off_t f_seekp; /* seek pointer */
+ dnode_phys_t f_dnode;
+ uint64_t f_zap_type; /* zap type for readdir */
+ uint64_t f_num_leafs; /* number of fzap leaf blocks */
+ zap_leaf_phys_t *f_zap_leaf; /* zap leaf buffer */
+};
+
+static int zfs_env_index;
+static int zfs_env_count;
+
+SLIST_HEAD(zfs_be_list, zfs_be_entry) zfs_be_head = SLIST_HEAD_INITIALIZER(zfs_be_head);
+struct zfs_be_list *zfs_be_headp;
+struct zfs_be_entry {
+ const char *name;
+ SLIST_ENTRY(zfs_be_entry) entries;
+} *zfs_be, *zfs_be_tmp;
+
+/*
+ * Open a file.
+ */
+static int
+zfs_open(const char *upath, struct open_file *f)
+{
+ struct zfsmount *mount = (struct zfsmount *)f->f_devdata;
+ struct file *fp;
+ int rc;
+
+ if (f->f_dev != &zfs_dev)
+ return (EINVAL);
+
+ /* allocate file system specific data structure */
+ fp = malloc(sizeof(struct file));
+ bzero(fp, sizeof(struct file));
+ f->f_fsdata = (void *)fp;
+
+ rc = zfs_lookup(mount, upath, &fp->f_dnode);
+ fp->f_seekp = 0;
+ if (rc) {
+ f->f_fsdata = NULL;
+ free(fp);
+ }
+ return (rc);
+}
+
+static int
+zfs_close(struct open_file *f)
+{
+ struct file *fp = (struct file *)f->f_fsdata;
+
+ dnode_cache_obj = NULL;
+ f->f_fsdata = (void *)0;
+ if (fp == (struct file *)0)
+ return (0);
+
+ free(fp);
+ return (0);
+}
+
+/*
+ * Copy a portion of a file into kernel memory.
+ * Cross block boundaries when necessary.
+ */
+static int
+zfs_read(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
+{
+ const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
+ struct file *fp = (struct file *)f->f_fsdata;
+ struct stat sb;
+ size_t n;
+ int rc;
+
+ rc = zfs_stat(f, &sb);
+ if (rc)
+ return (rc);
+ n = size;
+ if (fp->f_seekp + n > sb.st_size)
+ n = sb.st_size - fp->f_seekp;
+
+ rc = dnode_read(spa, &fp->f_dnode, fp->f_seekp, start, n);
+ if (rc)
+ return (rc);
+
+ if (0) {
+ int i;
+ for (i = 0; i < n; i++)
+ putchar(((char*) start)[i]);
+ }
+ fp->f_seekp += n;
+ if (resid)
+ *resid = size - n;
+
+ return (0);
+}
+
+/*
+ * Don't be silly - the bootstrap has no business writing anything.
+ */
+static int
+zfs_write(struct open_file *f, void *start, size_t size, size_t *resid /* out */)
+{
+
+ return (EROFS);
+}
+
+static off_t
+zfs_seek(struct open_file *f, off_t offset, int where)
+{
+ struct file *fp = (struct file *)f->f_fsdata;
+
+ switch (where) {
+ case SEEK_SET:
+ fp->f_seekp = offset;
+ break;
+ case SEEK_CUR:
+ fp->f_seekp += offset;
+ break;
+ case SEEK_END:
+ {
+ struct stat sb;
+ int error;
+
+ error = zfs_stat(f, &sb);
+ if (error != 0) {
+ errno = error;
+ return (-1);
+ }
+ fp->f_seekp = sb.st_size - offset;
+ break;
+ }
+ default:
+ errno = EINVAL;
+ return (-1);
+ }
+ return (fp->f_seekp);
+}
+
+static int
+zfs_stat(struct open_file *f, struct stat *sb)
+{
+ const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
+ struct file *fp = (struct file *)f->f_fsdata;
+
+ return (zfs_dnode_stat(spa, &fp->f_dnode, sb));
+}
+
+static int
+zfs_readdir(struct open_file *f, struct dirent *d)
+{
+ const spa_t *spa = ((struct zfsmount *)f->f_devdata)->spa;
+ struct file *fp = (struct file *)f->f_fsdata;
+ mzap_ent_phys_t mze;
+ struct stat sb;
+ size_t bsize = fp->f_dnode.dn_datablkszsec << SPA_MINBLOCKSHIFT;
+ int rc;
+
+ rc = zfs_stat(f, &sb);
+ if (rc)
+ return (rc);
+ if (!S_ISDIR(sb.st_mode))
+ return (ENOTDIR);
+
+ /*
+ * If this is the first read, get the zap type.
+ */
+ if (fp->f_seekp == 0) {
+ rc = dnode_read(spa, &fp->f_dnode,
+ 0, &fp->f_zap_type, sizeof(fp->f_zap_type));
+ if (rc)
+ return (rc);
+
+ if (fp->f_zap_type == ZBT_MICRO) {
+ fp->f_seekp = offsetof(mzap_phys_t, mz_chunk);
+ } else {
+ rc = dnode_read(spa, &fp->f_dnode,
+ offsetof(zap_phys_t, zap_num_leafs),
+ &fp->f_num_leafs,
+ sizeof(fp->f_num_leafs));
+ if (rc)
+ return (rc);
+
+ fp->f_seekp = bsize;
+ fp->f_zap_leaf = (zap_leaf_phys_t *)malloc(bsize);
+ rc = dnode_read(spa, &fp->f_dnode,
+ fp->f_seekp,
+ fp->f_zap_leaf,
+ bsize);
+ if (rc)
+ return (rc);
+ }
+ }
+
+ if (fp->f_zap_type == ZBT_MICRO) {
+ mzap_next:
+ if (fp->f_seekp >= bsize)
+ return (ENOENT);
+
+ rc = dnode_read(spa, &fp->f_dnode,
+ fp->f_seekp, &mze, sizeof(mze));
+ if (rc)
+ return (rc);
+ fp->f_seekp += sizeof(mze);
+
+ if (!mze.mze_name[0])
+ goto mzap_next;
+
+ d->d_fileno = ZFS_DIRENT_OBJ(mze.mze_value);
+ d->d_type = ZFS_DIRENT_TYPE(mze.mze_value);
+ strcpy(d->d_name, mze.mze_name);
+ d->d_namlen = strlen(d->d_name);
+ return (0);
+ } else {
+ zap_leaf_t zl;
+ zap_leaf_chunk_t *zc, *nc;
+ int chunk;
+ size_t namelen;
+ char *p;
+ uint64_t value;
+
+ /*
+ * Initialise this so we can use the ZAP size
+ * calculating macros.
+ */
+ zl.l_bs = ilog2(bsize);
+ zl.l_phys = fp->f_zap_leaf;
+
+ /*
+ * Figure out which chunk we are currently looking at
+ * and consider seeking to the next leaf. We use the
+ * low bits of f_seekp as a simple chunk index.
+ */
+ fzap_next:
+ chunk = fp->f_seekp & (bsize - 1);
+ if (chunk == ZAP_LEAF_NUMCHUNKS(&zl)) {
+ fp->f_seekp = rounddown2(fp->f_seekp, bsize) + bsize;
+ chunk = 0;
+
+ /*
+ * Check for EOF and read the new leaf.
+ */
+ if (fp->f_seekp >= bsize * fp->f_num_leafs)
+ return (ENOENT);
+
+ rc = dnode_read(spa, &fp->f_dnode,
+ fp->f_seekp,
+ fp->f_zap_leaf,
+ bsize);
+ if (rc)
+ return (rc);
+ }
+
+ zc = &ZAP_LEAF_CHUNK(&zl, chunk);
+ fp->f_seekp++;
+ if (zc->l_entry.le_type != ZAP_CHUNK_ENTRY)
+ goto fzap_next;
+
+ namelen = zc->l_entry.le_name_numints;
+ if (namelen > sizeof(d->d_name))
+ namelen = sizeof(d->d_name);
+
+ /*
+ * Paste the name back together.
+ */
+ nc = &ZAP_LEAF_CHUNK(&zl, zc->l_entry.le_name_chunk);
+ p = d->d_name;
+ while (namelen > 0) {
+ int len;
+ len = namelen;
+ if (len > ZAP_LEAF_ARRAY_BYTES)
+ len = ZAP_LEAF_ARRAY_BYTES;
+ memcpy(p, nc->l_array.la_array, len);
+ p += len;
+ namelen -= len;
+ nc = &ZAP_LEAF_CHUNK(&zl, nc->l_array.la_next);
+ }
+ d->d_name[sizeof(d->d_name) - 1] = 0;
+
+ /*
+ * Assume the first eight bytes of the value are
+ * a uint64_t.
+ */
+ value = fzap_leaf_value(&zl, zc);
+
+ d->d_fileno = ZFS_DIRENT_OBJ(value);
+ d->d_type = ZFS_DIRENT_TYPE(value);
+ d->d_namlen = strlen(d->d_name);
+
+ return (0);
+ }
+}
+
+static int
+vdev_read(vdev_t *vdev, void *priv, off_t offset, void *buf, size_t bytes)
+{
+ int fd, ret;
+ size_t res, size, remainder, rb_size, blksz;
+ unsigned secsz;
+ off_t off;
+ char *bouncebuf, *rb_buf;
+
+ fd = (uintptr_t) priv;
+ bouncebuf = NULL;
+
+ ret = ioctl(fd, DIOCGSECTORSIZE, &secsz);
+ if (ret != 0)
+ return (ret);
+
+ off = offset / secsz;
+ remainder = offset % secsz;
+ if (lseek(fd, off * secsz, SEEK_SET) == -1)
+ return (errno);
+
+ rb_buf = buf;
+ rb_size = bytes;
+ size = roundup2(bytes + remainder, secsz);
+ blksz = size;
+ if (remainder != 0 || size != bytes) {
+ bouncebuf = zfs_alloc(secsz);
+ if (bouncebuf == NULL) {
+ printf("vdev_read: out of memory\n");
+ return (ENOMEM);
+ }
+ rb_buf = bouncebuf;
+ blksz = rb_size - remainder;
+ }
+
+ while (bytes > 0) {
+ res = read(fd, rb_buf, rb_size);
+ if (res != rb_size) {
+ ret = EIO;
+ goto error;
+ }
+ if (bytes < blksz)
+ blksz = bytes;
+ if (bouncebuf != NULL)
+ memcpy(buf, rb_buf + remainder, blksz);
+ buf = (void *)((uintptr_t)buf + blksz);
+ bytes -= blksz;
+ remainder = 0;
+ blksz = rb_size;
+ }
+
+ ret = 0;
+error:
+ if (bouncebuf != NULL)
+ zfs_free(bouncebuf, secsz);
+ return (ret);
+}
+
+static int
+zfs_dev_init(void)
+{
+ spa_t *spa;
+ spa_t *next;
+ spa_t *prev;
+
+ zfs_init();
+ if (archsw.arch_zfs_probe == NULL)
+ return (ENXIO);
+ archsw.arch_zfs_probe();
+
+ prev = NULL;
+ spa = STAILQ_FIRST(&zfs_pools);
+ while (spa != NULL) {
+ next = STAILQ_NEXT(spa, spa_link);
+ if (zfs_spa_init(spa)) {
+ if (prev == NULL)
+ STAILQ_REMOVE_HEAD(&zfs_pools, spa_link);
+ else
+ STAILQ_REMOVE_AFTER(&zfs_pools, prev, spa_link);
+ } else
+ prev = spa;
+ spa = next;
+ }
+ return (0);
+}
+
+struct zfs_probe_args {
+ int fd;
+ const char *devname;
+ uint64_t *pool_guid;
+ u_int secsz;
+};
+
+static int
+zfs_diskread(void *arg, void *buf, size_t blocks, uint64_t offset)
+{
+ struct zfs_probe_args *ppa;
+
+ ppa = (struct zfs_probe_args *)arg;
+ return (vdev_read(NULL, (void *)(uintptr_t)ppa->fd,
+ offset * ppa->secsz, buf, blocks * ppa->secsz));
+}
+
+static int
+zfs_probe(int fd, uint64_t *pool_guid)
+{
+ spa_t *spa;
+ int ret;
+
+ ret = vdev_probe(vdev_read, (void *)(uintptr_t)fd, &spa);
+ if (ret == 0 && pool_guid != NULL)
+ *pool_guid = spa->spa_guid;
+ return (ret);
+}
+
+static int
+zfs_probe_partition(void *arg, const char *partname,
+ const struct ptable_entry *part)
+{
+ struct zfs_probe_args *ppa, pa;
+ struct ptable *table;
+ char devname[32];
+ int ret;
+
+ /* Probe only freebsd-zfs and freebsd partitions */
+ if (part->type != PART_FREEBSD &&
+ part->type != PART_FREEBSD_ZFS)
+ return (0);
+
+ ppa = (struct zfs_probe_args *)arg;
+ strncpy(devname, ppa->devname, strlen(ppa->devname) - 1);
+ devname[strlen(ppa->devname) - 1] = '\0';
+ sprintf(devname, "%s%s:", devname, partname);
+ pa.fd = open(devname, O_RDONLY);
+ if (pa.fd == -1)
+ return (0);
+ ret = zfs_probe(pa.fd, ppa->pool_guid);
+ if (ret == 0)
+ return (0);
+ /* Do we have BSD label here? */
+ if (part->type == PART_FREEBSD) {
+ pa.devname = devname;
+ pa.pool_guid = ppa->pool_guid;
+ pa.secsz = ppa->secsz;
+ table = ptable_open(&pa, part->end - part->start + 1,
+ ppa->secsz, zfs_diskread);
+ if (table != NULL) {
+ ptable_iterate(table, &pa, zfs_probe_partition);
+ ptable_close(table);
+ }
+ }
+ close(pa.fd);
+ return (0);
+}
+
+int
+zfs_probe_dev(const char *devname, uint64_t *pool_guid)
+{
+ struct ptable *table;
+ struct zfs_probe_args pa;
+ uint64_t mediasz;
+ int ret;
+
+ if (pool_guid)
+ *pool_guid = 0;
+ pa.fd = open(devname, O_RDONLY);
+ if (pa.fd == -1)
+ return (ENXIO);
+ /* Probe the whole disk */
+ ret = zfs_probe(pa.fd, pool_guid);
+ if (ret == 0)
+ return (0);
+
+ /* Probe each partition */
+ ret = ioctl(pa.fd, DIOCGMEDIASIZE, &mediasz);
+ if (ret == 0)
+ ret = ioctl(pa.fd, DIOCGSECTORSIZE, &pa.secsz);
+ if (ret == 0) {
+ pa.devname = devname;
+ pa.pool_guid = pool_guid;
+ table = ptable_open(&pa, mediasz / pa.secsz, pa.secsz,
+ zfs_diskread);
+ if (table != NULL) {
+ ptable_iterate(table, &pa, zfs_probe_partition);
+ ptable_close(table);
+ }
+ }
+ close(pa.fd);
+ if (pool_guid && *pool_guid == 0)
+ ret = ENXIO;
+ return (ret);
+}
+
+/*
+ * Print information about ZFS pools
+ */
+static int
+zfs_dev_print(int verbose)
+{
+ spa_t *spa;
+ char line[80];
+ int ret = 0;
+
+ if (STAILQ_EMPTY(&zfs_pools))
+ return (0);
+
+ printf("%s devices:", zfs_dev.dv_name);
+ if ((ret = pager_output("\n")) != 0)
+ return (ret);
+
+ if (verbose) {
+ return (spa_all_status());
+ }
+ STAILQ_FOREACH(spa, &zfs_pools, spa_link) {
+ snprintf(line, sizeof(line), " zfs:%s\n", spa->spa_name);
+ ret = pager_output(line);
+ if (ret != 0)
+ break;
+ }
+ return (ret);
+}
+
+/*
+ * Attempt to open the pool described by (dev) for use by (f).
+ */
+static int
+zfs_dev_open(struct open_file *f, ...)
+{
+ va_list args;
+ struct zfs_devdesc *dev;
+ struct zfsmount *mount;
+ spa_t *spa;
+ int rv;
+
+ va_start(args, f);
+ dev = va_arg(args, struct zfs_devdesc *);
+ va_end(args);
+
+ if (dev->pool_guid == 0)
+ spa = STAILQ_FIRST(&zfs_pools);
+ else
+ spa = spa_find_by_guid(dev->pool_guid);
+ if (!spa)
+ return (ENXIO);
+ mount = malloc(sizeof(*mount));
+ rv = zfs_mount(spa, dev->root_guid, mount);
+ if (rv != 0) {
+ free(mount);
+ return (rv);
+ }
+ if (mount->objset.os_type != DMU_OST_ZFS) {
+ printf("Unexpected object set type %ju\n",
+ (uintmax_t)mount->objset.os_type);
+ free(mount);
+ return (EIO);
+ }
+ f->f_devdata = mount;
+ free(dev);
+ return (0);
+}
+
+static int
+zfs_dev_close(struct open_file *f)
+{
+
+ free(f->f_devdata);
+ f->f_devdata = NULL;
+ return (0);
+}
+
+static int
+zfs_dev_strategy(void *devdata, int rw, daddr_t dblk, size_t size, char *buf, size_t *rsize)
+{
+
+ return (ENOSYS);
+}
+
+struct devsw zfs_dev = {
+ .dv_name = "zfs",
+ .dv_type = DEVT_ZFS,
+ .dv_init = zfs_dev_init,
+ .dv_strategy = zfs_dev_strategy,
+ .dv_open = zfs_dev_open,
+ .dv_close = zfs_dev_close,
+ .dv_ioctl = noioctl,
+ .dv_print = zfs_dev_print,
+ .dv_cleanup = NULL
+};
+
+int
+zfs_parsedev(struct zfs_devdesc *dev, const char *devspec, const char **path)
+{
+ static char rootname[ZFS_MAXNAMELEN];
+ static char poolname[ZFS_MAXNAMELEN];
+ spa_t *spa;
+ const char *end;
+ const char *np;
+ const char *sep;
+ int rv;
+
+ np = devspec;
+ if (*np != ':')
+ return (EINVAL);
+ np++;
+ end = strchr(np, ':');
+ if (end == NULL)
+ return (EINVAL);
+ sep = strchr(np, '/');
+ if (sep == NULL || sep >= end)
+ sep = end;
+ memcpy(poolname, np, sep - np);
+ poolname[sep - np] = '\0';
+ if (sep < end) {
+ sep++;
+ memcpy(rootname, sep, end - sep);
+ rootname[end - sep] = '\0';
+ }
+ else
+ rootname[0] = '\0';
+
+ spa = spa_find_by_name(poolname);
+ if (!spa)
+ return (ENXIO);
+ dev->pool_guid = spa->spa_guid;
+ rv = zfs_lookup_dataset(spa, rootname, &dev->root_guid);
+ if (rv != 0)
+ return (rv);
+ if (path != NULL)
+ *path = (*end == '\0') ? end : end + 1;
+ dev->d_dev = &zfs_dev;
+ dev->d_type = zfs_dev.dv_type;
+ return (0);
+}
+
+char *
+zfs_fmtdev(void *vdev)
+{
+ static char rootname[ZFS_MAXNAMELEN];
+ static char buf[2 * ZFS_MAXNAMELEN + 8];
+ struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev;
+ spa_t *spa;
+
+ buf[0] = '\0';
+ if (dev->d_type != DEVT_ZFS)
+ return (buf);
+
+ if (dev->pool_guid == 0) {
+ spa = STAILQ_FIRST(&zfs_pools);
+ dev->pool_guid = spa->spa_guid;
+ } else
+ spa = spa_find_by_guid(dev->pool_guid);
+ if (spa == NULL) {
+ printf("ZFS: can't find pool by guid\n");
+ return (buf);
+ }
+ if (dev->root_guid == 0 && zfs_get_root(spa, &dev->root_guid)) {
+ printf("ZFS: can't find root filesystem\n");
+ return (buf);
+ }
+ if (zfs_rlookup(spa, dev->root_guid, rootname)) {
+ printf("ZFS: can't find filesystem by guid\n");
+ return (buf);
+ }
+
+ if (rootname[0] == '\0')
+ sprintf(buf, "%s:%s:", dev->d_dev->dv_name, spa->spa_name);
+ else
+ sprintf(buf, "%s:%s/%s:", dev->d_dev->dv_name, spa->spa_name,
+ rootname);
+ return (buf);
+}
+
+int
+zfs_list(const char *name)
+{
+ static char poolname[ZFS_MAXNAMELEN];
+ uint64_t objid;
+ spa_t *spa;
+ const char *dsname;
+ int len;
+ int rv;
+
+ len = strlen(name);
+ dsname = strchr(name, '/');
+ if (dsname != NULL) {
+ len = dsname - name;
+ dsname++;
+ } else
+ dsname = "";
+ memcpy(poolname, name, len);
+ poolname[len] = '\0';
+
+ spa = spa_find_by_name(poolname);
+ if (!spa)
+ return (ENXIO);
+ rv = zfs_lookup_dataset(spa, dsname, &objid);
+ if (rv != 0)
+ return (rv);
+
+ return (zfs_list_dataset(spa, objid));
+}
+
+void
+init_zfs_bootenv(char *currdev)
+{
+ char *beroot;
+
+ if (strlen(currdev) == 0)
+ return;
+ if(strncmp(currdev, "zfs:", 4) != 0)
+ return;
+ /* Remove the trailing : */
+ currdev[strlen(currdev) - 1] = '\0';
+ setenv("zfs_be_active", currdev, 1);
+ setenv("zfs_be_currpage", "1", 1);
+ /* Forward past zfs: */
+ currdev = strchr(currdev, ':');
+ currdev++;
+ /* Remove the last element (current bootenv) */
+ beroot = strrchr(currdev, '/');
+ if (beroot != NULL)
+ beroot[0] = '\0';
+ beroot = currdev;
+ setenv("zfs_be_root", beroot, 1);
+}
+
+int
+zfs_bootenv(const char *name)
+{
+ static char poolname[ZFS_MAXNAMELEN], *dsname, *root;
+ char becount[4];
+ uint64_t objid;
+ spa_t *spa;
+ int len, rv, pages, perpage, currpage;
+
+ if (name == NULL)
+ return (EINVAL);
+ if ((root = getenv("zfs_be_root")) == NULL)
+ return (EINVAL);
+
+ if (strcmp(name, root) != 0) {
+ if (setenv("zfs_be_root", name, 1) != 0)
+ return (ENOMEM);
+ }
+
+ SLIST_INIT(&zfs_be_head);
+ zfs_env_count = 0;
+ len = strlen(name);
+ dsname = strchr(name, '/');
+ if (dsname != NULL) {
+ len = dsname - name;
+ dsname++;
+ } else
+ dsname = "";
+ memcpy(poolname, name, len);
+ poolname[len] = '\0';
+
+ spa = spa_find_by_name(poolname);
+ if (!spa)
+ return (ENXIO);
+ rv = zfs_lookup_dataset(spa, dsname, &objid);
+ if (rv != 0)
+ return (rv);
+ rv = zfs_callback_dataset(spa, objid, zfs_belist_add);
+
+ /* Calculate and store the number of pages of BEs */
+ perpage = (ZFS_BE_LAST - ZFS_BE_FIRST + 1);
+ pages = (zfs_env_count / perpage) + ((zfs_env_count % perpage) > 0 ? 1 : 0);
+ snprintf(becount, 4, "%d", pages);
+ if (setenv("zfs_be_pages", becount, 1) != 0)
+ return (ENOMEM);
+
+ /* Roll over the page counter if it has exceeded the maximum */
+ currpage = strtol(getenv("zfs_be_currpage"), NULL, 10);
+ if (currpage > pages) {
+ if (setenv("zfs_be_currpage", "1", 1) != 0)
+ return (ENOMEM);
+ }
+
+ /* Populate the menu environment variables */
+ zfs_set_env();
+
+ /* Clean up the SLIST of ZFS BEs */
+ while (!SLIST_EMPTY(&zfs_be_head)) {
+ zfs_be = SLIST_FIRST(&zfs_be_head);
+ SLIST_REMOVE_HEAD(&zfs_be_head, entries);
+ free(zfs_be);
+ }
+
+ return (rv);
+}
+
+int
+zfs_belist_add(const char *name, uint64_t value __unused)
+{
+
+ /* Skip special datasets that start with a $ character */
+ if (strncmp(name, "$", 1) == 0) {
+ return (0);
+ }
+ /* Add the boot environment to the head of the SLIST */
+ zfs_be = malloc(sizeof(struct zfs_be_entry));
+ if (zfs_be == NULL) {
+ return (ENOMEM);
+ }
+ zfs_be->name = name;
+ SLIST_INSERT_HEAD(&zfs_be_head, zfs_be, entries);
+ zfs_env_count++;
+
+ return (0);
+}
+
+int
+zfs_set_env(void)
+{
+ char envname[32], envval[256];
+ char *beroot, *pagenum;
+ int rv, page, ctr;
+
+ beroot = getenv("zfs_be_root");
+ if (beroot == NULL) {
+ return (1);
+ }
+
+ pagenum = getenv("zfs_be_currpage");
+ if (pagenum != NULL) {
+ page = strtol(pagenum, NULL, 10);
+ } else {
+ page = 1;
+ }
+
+ ctr = 1;
+ rv = 0;
+ zfs_env_index = ZFS_BE_FIRST;
+ SLIST_FOREACH_SAFE(zfs_be, &zfs_be_head, entries, zfs_be_tmp) {
+ /* Skip to the requested page number */
+ if (ctr <= ((ZFS_BE_LAST - ZFS_BE_FIRST + 1) * (page - 1))) {
+ ctr++;
+ continue;
+ }
+
+ snprintf(envname, sizeof(envname), "bootenvmenu_caption[%d]", zfs_env_index);
+ snprintf(envval, sizeof(envval), "%s", zfs_be->name);
+ rv = setenv(envname, envval, 1);
+ if (rv != 0) {
+ break;
+ }
+
+ snprintf(envname, sizeof(envname), "bootenvansi_caption[%d]", zfs_env_index);
+ rv = setenv(envname, envval, 1);
+ if (rv != 0){
+ break;
+ }
+
+ snprintf(envname, sizeof(envname), "bootenvmenu_command[%d]", zfs_env_index);
+ rv = setenv(envname, "set_bootenv", 1);
+ if (rv != 0){
+ break;
+ }
+
+ snprintf(envname, sizeof(envname), "bootenv_root[%d]", zfs_env_index);
+ snprintf(envval, sizeof(envval), "zfs:%s/%s", beroot, zfs_be->name);
+ rv = setenv(envname, envval, 1);
+ if (rv != 0){
+ break;
+ }
+
+ zfs_env_index++;
+ if (zfs_env_index > ZFS_BE_LAST) {
+ break;
+ }
+
+ }
+
+ for (; zfs_env_index <= ZFS_BE_LAST; zfs_env_index++) {
+ snprintf(envname, sizeof(envname), "bootenvmenu_caption[%d]", zfs_env_index);
+ (void)unsetenv(envname);
+ snprintf(envname, sizeof(envname), "bootenvansi_caption[%d]", zfs_env_index);
+ (void)unsetenv(envname);
+ snprintf(envname, sizeof(envname), "bootenvmenu_command[%d]", zfs_env_index);
+ (void)unsetenv(envname);
+ snprintf(envname, sizeof(envname), "bootenv_root[%d]", zfs_env_index);
+ (void)unsetenv(envname);
+ }
+
+ return (rv);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-06-23 20:55:06 +0000