diff --git a/stand/libsa/zfs/zfs.c b/stand/libsa/zfs/zfs.c index af938fbe1b2b..f3cf60786a23 100644 --- a/stand/libsa/zfs/zfs.c +++ b/stand/libsa/zfs/zfs.c @@ -1,2018 +1,2022 @@ /*- * 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. */ #include /* * Stand-alone file reading package. */ #include #include #include #include #include #include #include #include #include #include #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_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); static int zfs_mount(const char *dev, const char *path, void **data); static int zfs_unmount(const char *dev, void *data); static void zfs_bootenv_initial(const char *envname, spa_t *spa, const char *name, const char *dsname, int checkpoint); static void zfs_checkpoints_initial(spa_t *spa, const char *name, const char *dsname); static int zfs_parsedev(struct devdesc **idev, const char *devspec, const char **path); struct devsw zfs_dev; struct fs_ops zfs_fsops = { .fs_name = "zfs", .fo_open = zfs_open, .fo_close = zfs_close, .fo_read = zfs_read, .fo_write = null_write, .fo_seek = zfs_seek, .fo_stat = zfs_stat, .fo_readdir = zfs_readdir, .fo_mount = zfs_mount, .fo_unmount = zfs_unmount }; /* * 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 { 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 devdesc *dev = f->f_devdata; struct zfsmount *mount = dev->d_opendata; struct file *fp; int rc; if (f->f_dev != &zfs_dev) return (EINVAL); /* allocate file system specific data structure */ fp = calloc(1, sizeof(struct file)); if (fp == NULL) return (ENOMEM); f->f_fsdata = 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 = NULL; 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 */) { struct devdesc *dev = f->f_devdata; const spa_t *spa = ((struct zfsmount *)dev->d_opendata)->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); } 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) { struct devdesc *dev = f->f_devdata; const spa_t *spa = ((struct zfsmount *)dev->d_opendata)->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) { struct devdesc *dev = f->f_devdata; const spa_t *spa = ((struct zfsmount *)dev->d_opendata)->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 = malloc(bsize); if (fp->f_zap_leaf == NULL) return (ENOMEM); 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 spa_t * spa_find_by_dev(struct zfs_devdesc *dev) { if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (NULL); if (dev->pool_guid == 0) return (STAILQ_FIRST(&zfs_pools)); return (spa_find_by_guid(dev->pool_guid)); } /* * if path is NULL, create mount structure, but do not add it to list. */ static int zfs_mount(const char *dev, const char *path, void **data) { struct zfs_devdesc *zfsdev = NULL; spa_t *spa; struct zfsmount *mnt = NULL; int rv; errno = 0; rv = zfs_parsedev((struct devdesc **)&zfsdev, dev, NULL); if (rv != 0) { return (rv); } spa = spa_find_by_dev(zfsdev); if (spa == NULL) { rv = ENXIO; goto err; } mnt = calloc(1, sizeof(*mnt)); if (mnt == NULL) { rv = ENOMEM; goto err; } if (mnt->path != NULL) { mnt->path = strdup(path); if (mnt->path == NULL) { rv = ENOMEM; goto err; } } rv = zfs_mount_impl(spa, zfsdev->root_guid, mnt); if (rv == 0 && mnt->objset.os_type != DMU_OST_ZFS) { printf("Unexpected object set type %ju\n", (uintmax_t)mnt->objset.os_type); rv = EIO; } err: if (rv != 0) { if (mnt != NULL) free(mnt->path); free(mnt); free(zfsdev); return (rv); } *data = mnt; if (path != NULL) STAILQ_INSERT_TAIL(&zfsmount, mnt, next); free(zfsdev); return (rv); } static int zfs_unmount(const char *dev, void *data) { struct zfsmount *mnt = data; STAILQ_REMOVE(&zfsmount, mnt, zfsmount, next); free(mnt->path); free(mnt); 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, head, tail, total_size, full_sec_size; unsigned secsz, do_tail_read; off_t start_sec; char *outbuf, *bouncebuf; fd = (uintptr_t) priv; outbuf = (char *) buf; bouncebuf = NULL; ret = ioctl(fd, DIOCGSECTORSIZE, &secsz); if (ret != 0) return (ret); /* * Handling reads of arbitrary offset and size - multi-sector case * and single-sector case. * * Multi-sector Case * (do_tail_read = true if tail > 0) * * |<----------------------total_size--------------------->| * | | * |<--head-->|<--------------bytes------------>|<--tail-->| * | | | | * | | |<~full_sec_size~>| | | * +------------------+ +------------------+ * | |0101010| . . . |0101011| | * +------------------+ +------------------+ * start_sec start_sec + n * * * Single-sector Case * (do_tail_read = false) * * |<------total_size = secsz----->| * | | * |<-head->|<---bytes--->|<-tail->| * +-------------------------------+ * | |0101010101010| | * +-------------------------------+ * start_sec */ start_sec = offset / secsz; head = offset % secsz; total_size = roundup2(head + bytes, secsz); tail = total_size - (head + bytes); do_tail_read = ((tail > 0) && (head + bytes > secsz)); full_sec_size = total_size; if (head > 0) full_sec_size -= secsz; if (do_tail_read) full_sec_size -= secsz; /* Return of partial sector data requires a bounce buffer. */ if ((head > 0) || do_tail_read || bytes < secsz) { bouncebuf = malloc(secsz); if (bouncebuf == NULL) { printf("vdev_read: out of memory\n"); return (ENOMEM); } } if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) { ret = errno; goto error; } /* Partial data return from first sector */ if (head > 0) { res = read(fd, bouncebuf, secsz); if (res != secsz) { ret = EIO; goto error; } memcpy(outbuf, bouncebuf + head, min(secsz - head, bytes)); outbuf += min(secsz - head, bytes); } /* * Full data return from read sectors. * Note, there is still corner case where we read * from sector boundary, but less than sector size, e.g. reading 512B * from 4k sector. */ if (full_sec_size > 0) { if (bytes < full_sec_size) { res = read(fd, bouncebuf, secsz); if (res != secsz) { ret = EIO; goto error; } memcpy(outbuf, bouncebuf, bytes); } else { res = read(fd, outbuf, full_sec_size); if (res != full_sec_size) { ret = EIO; goto error; } outbuf += full_sec_size; } } /* Partial data return from last sector */ if (do_tail_read) { res = read(fd, bouncebuf, secsz); if (res != secsz) { ret = EIO; goto error; } memcpy(outbuf, bouncebuf, secsz - tail); } ret = 0; error: free(bouncebuf); return (ret); } static int vdev_write(vdev_t *vdev, off_t offset, void *buf, size_t bytes) { int fd, ret; size_t head, tail, total_size, full_sec_size; unsigned secsz, do_tail_write; off_t start_sec; ssize_t res; char *outbuf, *bouncebuf; fd = (uintptr_t)vdev->v_priv; outbuf = (char *)buf; bouncebuf = NULL; ret = ioctl(fd, DIOCGSECTORSIZE, &secsz); if (ret != 0) return (ret); start_sec = offset / secsz; head = offset % secsz; total_size = roundup2(head + bytes, secsz); tail = total_size - (head + bytes); do_tail_write = ((tail > 0) && (head + bytes > secsz)); full_sec_size = total_size; if (head > 0) full_sec_size -= secsz; if (do_tail_write) full_sec_size -= secsz; /* Partial sector write requires a bounce buffer. */ if ((head > 0) || do_tail_write || bytes < secsz) { bouncebuf = malloc(secsz); if (bouncebuf == NULL) { printf("vdev_write: out of memory\n"); return (ENOMEM); } } if (lseek(fd, start_sec * secsz, SEEK_SET) == -1) { ret = errno; goto error; } /* Partial data for first sector */ if (head > 0) { res = read(fd, bouncebuf, secsz); if ((unsigned)res != secsz) { ret = EIO; goto error; } memcpy(bouncebuf + head, outbuf, min(secsz - head, bytes)); (void) lseek(fd, -secsz, SEEK_CUR); res = write(fd, bouncebuf, secsz); if ((unsigned)res != secsz) { ret = EIO; goto error; } outbuf += min(secsz - head, bytes); } /* * Full data write to sectors. * Note, there is still corner case where we write * to sector boundary, but less than sector size, e.g. write 512B * to 4k sector. */ if (full_sec_size > 0) { if (bytes < full_sec_size) { res = read(fd, bouncebuf, secsz); if ((unsigned)res != secsz) { ret = EIO; goto error; } memcpy(bouncebuf, outbuf, bytes); (void) lseek(fd, -secsz, SEEK_CUR); res = write(fd, bouncebuf, secsz); if ((unsigned)res != secsz) { ret = EIO; goto error; } } else { res = write(fd, outbuf, full_sec_size); if ((unsigned)res != full_sec_size) { ret = EIO; goto error; } outbuf += full_sec_size; } } /* Partial data write to last sector */ if (do_tail_write) { res = read(fd, bouncebuf, secsz); if ((unsigned)res != secsz) { ret = EIO; goto error; } memcpy(bouncebuf, outbuf, secsz - tail); (void) lseek(fd, -secsz, SEEK_CUR); res = write(fd, bouncebuf, secsz); if ((unsigned)res != secsz) { ret = EIO; goto error; } } ret = 0; error: free(bouncebuf); 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; spa = NULL; ret = vdev_probe(vdev_read, vdev_write, (void *)(uintptr_t)fd, &spa); if (ret == 0 && pool_guid != NULL) if (*pool_guid == 0) *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'; snprintf(devname, sizeof(devname), "%s%s:", devname, partname); pa.fd = open(devname, O_RDWR); 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); } /* * Return bootenv nvlist from pool label. */ int zfs_get_bootenv(void *vdev, nvlist_t **benvp) { spa_t *spa; if ((spa = spa_find_by_dev((struct zfs_devdesc *)vdev)) == NULL) return (ENXIO); return (zfs_get_bootenv_spa(spa, benvp)); } /* * Store nvlist to pool label bootenv area. Also updates cached pointer in spa. */ int zfs_set_bootenv(void *vdev, nvlist_t *benv) { spa_t *spa; if ((spa = spa_find_by_dev((struct zfs_devdesc *)vdev)) == NULL) return (ENXIO); return (zfs_set_bootenv_spa(spa, benv)); } /* * Get bootonce value by key. The bootonce pair is removed * from the bootenv nvlist and the remaining nvlist is committed back to disk. */ int zfs_get_bootonce(void *vdev, const char *key, char *buf, size_t size) { spa_t *spa; if ((spa = spa_find_by_dev((struct zfs_devdesc *)vdev)) == NULL) return (ENXIO); return (zfs_get_bootonce_spa(spa, key, buf, size)); } /* * nvstore backend. */ static int zfs_nvstore_setter(void *, int, const char *, const void *, size_t); static int zfs_nvstore_setter_str(void *, const char *, const char *, const char *); static int zfs_nvstore_unset_impl(void *, const char *, bool); static int zfs_nvstore_setenv(void *, void *); /* * nvstore is only present for current rootfs pool. */ static int zfs_nvstore_sethook(struct env_var *ev, int flags __unused, const void *value) { struct zfs_devdesc *dev; int rv; archsw.arch_getdev((void **)&dev, NULL, NULL); if (dev == NULL) return (ENXIO); rv = zfs_nvstore_setter_str(dev, NULL, ev->ev_name, value); free(dev); return (rv); } /* * nvstore is only present for current rootfs pool. */ static int zfs_nvstore_unsethook(struct env_var *ev) { struct zfs_devdesc *dev; int rv; archsw.arch_getdev((void **)&dev, NULL, NULL); if (dev == NULL) return (ENXIO); rv = zfs_nvstore_unset_impl(dev, ev->ev_name, false); free(dev); return (rv); } static int zfs_nvstore_getter(void *vdev, const char *name, void **data) { struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev; spa_t *spa; nvlist_t *nv; char *str, **ptr; int size; int rv; if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (ENOTSUP); if ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); if (spa->spa_bootenv == NULL) return (ENXIO); if (nvlist_find(spa->spa_bootenv, OS_NVSTORE, DATA_TYPE_NVLIST, NULL, &nv, NULL) != 0) return (ENOENT); rv = nvlist_find(nv, name, DATA_TYPE_STRING, NULL, &str, &size); if (rv == 0) { ptr = (char **)data; asprintf(ptr, "%.*s", size, str); if (*data == NULL) rv = ENOMEM; } nvlist_destroy(nv); return (rv); } static int zfs_nvstore_setter(void *vdev, int type, const char *name, const void *data, size_t size) { struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev; spa_t *spa; nvlist_t *nv; int rv; bool env_set = true; if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (ENOTSUP); if ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); if (spa->spa_bootenv == NULL) return (ENXIO); if (nvlist_find(spa->spa_bootenv, OS_NVSTORE, DATA_TYPE_NVLIST, NULL, &nv, NULL) != 0) { nv = nvlist_create(NV_UNIQUE_NAME); if (nv == NULL) return (ENOMEM); } rv = 0; switch (type) { case DATA_TYPE_INT8: if (size != sizeof (int8_t)) { rv = EINVAL; break; } rv = nvlist_add_int8(nv, name, *(int8_t *)data); break; case DATA_TYPE_INT16: if (size != sizeof (int16_t)) { rv = EINVAL; break; } rv = nvlist_add_int16(nv, name, *(int16_t *)data); break; case DATA_TYPE_INT32: if (size != sizeof (int32_t)) { rv = EINVAL; break; } rv = nvlist_add_int32(nv, name, *(int32_t *)data); break; case DATA_TYPE_INT64: if (size != sizeof (int64_t)) { rv = EINVAL; break; } rv = nvlist_add_int64(nv, name, *(int64_t *)data); break; case DATA_TYPE_BYTE: if (size != sizeof (uint8_t)) { rv = EINVAL; break; } rv = nvlist_add_byte(nv, name, *(int8_t *)data); break; case DATA_TYPE_UINT8: if (size != sizeof (uint8_t)) { rv = EINVAL; break; } rv = nvlist_add_uint8(nv, name, *(int8_t *)data); break; case DATA_TYPE_UINT16: if (size != sizeof (uint16_t)) { rv = EINVAL; break; } rv = nvlist_add_uint16(nv, name, *(uint16_t *)data); break; case DATA_TYPE_UINT32: if (size != sizeof (uint32_t)) { rv = EINVAL; break; } rv = nvlist_add_uint32(nv, name, *(uint32_t *)data); break; case DATA_TYPE_UINT64: if (size != sizeof (uint64_t)) { rv = EINVAL; break; } rv = nvlist_add_uint64(nv, name, *(uint64_t *)data); break; case DATA_TYPE_STRING: rv = nvlist_add_string(nv, name, data); break; case DATA_TYPE_BOOLEAN_VALUE: if (size != sizeof (boolean_t)) { rv = EINVAL; break; } rv = nvlist_add_boolean_value(nv, name, *(boolean_t *)data); break; default: rv = EINVAL; break; } if (rv == 0) { rv = nvlist_add_nvlist(spa->spa_bootenv, OS_NVSTORE, nv); if (rv == 0) { rv = zfs_set_bootenv(vdev, spa->spa_bootenv); } if (rv == 0) { if (env_set) { rv = zfs_nvstore_setenv(vdev, nvpair_find(nv, name)); } else { env_discard(env_getenv(name)); rv = 0; } } } nvlist_destroy(nv); return (rv); } static int get_int64(const char *data, int64_t *ip) { char *end; int64_t val; errno = 0; val = strtoll(data, &end, 0); if (errno != 0 || *data == '\0' || *end != '\0') return (EINVAL); *ip = val; return (0); } static int get_uint64(const char *data, uint64_t *ip) { char *end; uint64_t val; errno = 0; val = strtoull(data, &end, 0); if (errno != 0 || *data == '\0' || *end != '\0') return (EINVAL); *ip = val; return (0); } /* * Translate textual data to data type. If type is not set, and we are * creating new pair, use DATA_TYPE_STRING. */ static int zfs_nvstore_setter_str(void *vdev, const char *type, const char *name, const char *data) { struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev; spa_t *spa; nvlist_t *nv; int rv; data_type_t dt; int64_t val; uint64_t uval; if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (ENOTSUP); if ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); if (spa->spa_bootenv == NULL) return (ENXIO); if (nvlist_find(spa->spa_bootenv, OS_NVSTORE, DATA_TYPE_NVLIST, NULL, &nv, NULL) != 0) { nv = NULL; } if (type == NULL) { nvp_header_t *nvh; /* * if there is no existing pair, default to string. * Otherwise, use type from existing pair. */ nvh = nvpair_find(nv, name); if (nvh == NULL) { dt = DATA_TYPE_STRING; } else { nv_string_t *nvp_name; nv_pair_data_t *nvp_data; nvp_name = (nv_string_t *)(nvh + 1); nvp_data = (nv_pair_data_t *)(&nvp_name->nv_data[0] + NV_ALIGN4(nvp_name->nv_size)); dt = nvp_data->nv_type; } } else { dt = nvpair_type_from_name(type); } nvlist_destroy(nv); rv = 0; switch (dt) { case DATA_TYPE_INT8: rv = get_int64(data, &val); if (rv == 0) { int8_t v = val; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_INT16: rv = get_int64(data, &val); if (rv == 0) { int16_t v = val; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_INT32: rv = get_int64(data, &val); if (rv == 0) { int32_t v = val; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_INT64: rv = get_int64(data, &val); if (rv == 0) { rv = zfs_nvstore_setter(vdev, dt, name, &val, sizeof (val)); } break; case DATA_TYPE_BYTE: rv = get_uint64(data, &uval); if (rv == 0) { uint8_t v = uval; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_UINT8: rv = get_uint64(data, &uval); if (rv == 0) { uint8_t v = uval; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_UINT16: rv = get_uint64(data, &uval); if (rv == 0) { uint16_t v = uval; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_UINT32: rv = get_uint64(data, &uval); if (rv == 0) { uint32_t v = uval; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } break; case DATA_TYPE_UINT64: rv = get_uint64(data, &uval); if (rv == 0) { rv = zfs_nvstore_setter(vdev, dt, name, &uval, sizeof (uval)); } break; case DATA_TYPE_STRING: rv = zfs_nvstore_setter(vdev, dt, name, data, strlen(data) + 1); break; case DATA_TYPE_BOOLEAN_VALUE: rv = get_int64(data, &val); if (rv == 0) { boolean_t v = val; rv = zfs_nvstore_setter(vdev, dt, name, &v, sizeof (v)); } default: rv = EINVAL; } return (rv); } static int zfs_nvstore_unset_impl(void *vdev, const char *name, bool unset_env) { struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev; spa_t *spa; nvlist_t *nv; int rv; if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (ENOTSUP); if ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); if (spa->spa_bootenv == NULL) return (ENXIO); if (nvlist_find(spa->spa_bootenv, OS_NVSTORE, DATA_TYPE_NVLIST, NULL, &nv, NULL) != 0) return (ENOENT); rv = nvlist_remove(nv, name, DATA_TYPE_UNKNOWN); if (rv == 0) { if (nvlist_next_nvpair(nv, NULL) == NULL) { rv = nvlist_remove(spa->spa_bootenv, OS_NVSTORE, DATA_TYPE_NVLIST); } else { rv = nvlist_add_nvlist(spa->spa_bootenv, OS_NVSTORE, nv); } if (rv == 0) rv = zfs_set_bootenv(vdev, spa->spa_bootenv); } - if (unset_env) - env_discard(env_getenv(name)); + if (unset_env) { + struct env_var *ev = env_getenv(name); + + if (ev != NULL) + env_discard(ev); + } return (rv); } static int zfs_nvstore_unset(void *vdev, const char *name) { return (zfs_nvstore_unset_impl(vdev, name, true)); } static int zfs_nvstore_print(void *vdev __unused, void *ptr) { nvpair_print(ptr, 0); return (0); } /* * Create environment variable from nvpair. * set hook will update nvstore with new value, unset hook will remove * variable from nvstore. */ static int zfs_nvstore_setenv(void *vdev __unused, void *ptr) { nvp_header_t *nvh = ptr; nv_string_t *nvp_name, *nvp_value; nv_pair_data_t *nvp_data; char *name, *value; int rv = 0; if (nvh == NULL) return (ENOENT); nvp_name = (nv_string_t *)(nvh + 1); nvp_data = (nv_pair_data_t *)(&nvp_name->nv_data[0] + NV_ALIGN4(nvp_name->nv_size)); if ((name = nvstring_get(nvp_name)) == NULL) return (ENOMEM); value = NULL; switch (nvp_data->nv_type) { case DATA_TYPE_BYTE: case DATA_TYPE_UINT8: (void) asprintf(&value, "%uc", *(unsigned *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_INT8: (void) asprintf(&value, "%c", *(int *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_INT16: (void) asprintf(&value, "%hd", *(short *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_UINT16: (void) asprintf(&value, "%hu", *(unsigned short *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_BOOLEAN_VALUE: case DATA_TYPE_INT32: (void) asprintf(&value, "%d", *(int *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_UINT32: (void) asprintf(&value, "%u", *(unsigned *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_INT64: (void) asprintf(&value, "%jd", (intmax_t)*(int64_t *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_UINT64: (void) asprintf(&value, "%ju", (uintmax_t)*(uint64_t *)&nvp_data->nv_data[0]); if (value == NULL) rv = ENOMEM; break; case DATA_TYPE_STRING: nvp_value = (nv_string_t *)&nvp_data->nv_data[0]; if ((value = nvstring_get(nvp_value)) == NULL) { rv = ENOMEM; break; } break; default: rv = EINVAL; break; } if (value != NULL) { rv = env_setenv(name, EV_VOLATILE | EV_NOHOOK, value, zfs_nvstore_sethook, zfs_nvstore_unsethook); free(value); } free(name); return (rv); } static int zfs_nvstore_iterate(void *vdev, int (*cb)(void *, void *)) { struct zfs_devdesc *dev = (struct zfs_devdesc *)vdev; spa_t *spa; nvlist_t *nv; nvp_header_t *nvh; int rv; if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (ENOTSUP); if ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); if (spa->spa_bootenv == NULL) return (ENXIO); if (nvlist_find(spa->spa_bootenv, OS_NVSTORE, DATA_TYPE_NVLIST, NULL, &nv, NULL) != 0) return (ENOENT); rv = 0; nvh = NULL; while ((nvh = nvlist_next_nvpair(nv, nvh)) != NULL) { rv = cb(vdev, nvh); if (rv != 0) break; } return (rv); } nvs_callbacks_t nvstore_zfs_cb = { .nvs_getter = zfs_nvstore_getter, .nvs_setter = zfs_nvstore_setter, .nvs_setter_str = zfs_nvstore_setter_str, .nvs_unset = zfs_nvstore_unset, .nvs_print = zfs_nvstore_print, .nvs_iterate = zfs_nvstore_iterate }; int zfs_attach_nvstore(void *vdev) { struct zfs_devdesc *dev = vdev; spa_t *spa; uint64_t version; int rv; if (dev->dd.d_dev->dv_type != DEVT_ZFS) return (ENOTSUP); if ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); rv = nvlist_find(spa->spa_bootenv, BOOTENV_VERSION, DATA_TYPE_UINT64, NULL, &version, NULL); if (rv != 0 || version != VB_NVLIST) { return (ENXIO); } dev = malloc(sizeof (*dev)); if (dev == NULL) return (ENOMEM); memcpy(dev, vdev, sizeof (*dev)); rv = nvstore_init(spa->spa_name, &nvstore_zfs_cb, dev); if (rv != 0) free(dev); else rv = zfs_nvstore_iterate(dev, zfs_nvstore_setenv); return (rv); } int zfs_probe_dev(const char *devname, uint64_t *pool_guid, bool parts_too) { struct ptable *table; struct zfs_probe_args pa; uint64_t mediasz; int ret; if (pool_guid) *pool_guid = 0; pa.fd = open(devname, O_RDWR); if (pa.fd == -1) return (ENXIO); /* Probe the whole disk */ ret = zfs_probe(pa.fd, pool_guid); if (ret == 0) return (0); if (!parts_too) return (ENXIO); /* 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 ((spa = spa_find_by_dev(dev)) == NULL) return (ENXIO); STAILQ_FOREACH(mount, &zfsmount, next) { if (spa->spa_guid == mount->spa->spa_guid) break; } rv = 0; /* This device is not set as currdev, mount us private copy. */ if (mount == NULL) rv = zfs_mount(devformat(&dev->dd), NULL, (void **)&mount); if (rv == 0) { dev->dd.d_opendata = mount; } return (rv); } static int zfs_dev_close(struct open_file *f) { struct devdesc *dev; struct zfsmount *mnt, *mount; dev = f->f_devdata; mnt = dev->d_opendata; STAILQ_FOREACH(mount, &zfsmount, next) { if (mnt->spa->spa_guid == mount->spa->spa_guid) break; } /* XXX */ 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 = nullsys, .dv_fmtdev = zfs_fmtdev, .dv_parsedev = zfs_parsedev, }; static int zfs_parsedev(struct devdesc **idev, 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; struct zfs_devdesc *dev; np = devspec + 3; /* Skip the leading 'zfs' */ if (*np != ':') return (EINVAL); np++; end = strrchr(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 = malloc(sizeof(*dev)); if (dev == NULL) return (ENOMEM); dev->pool_guid = spa->spa_guid; rv = zfs_lookup_dataset(spa, rootname, &dev->root_guid); if (rv != 0) { free(dev); return (rv); } if (path != NULL) *path = (*end == '\0') ? end : end + 1; dev->dd.d_dev = &zfs_dev; *idev = &dev->dd; return (0); } char * zfs_fmtdev(struct devdesc *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 (vdev->d_dev->dv_type != DEVT_ZFS) return (buf); /* Do we have any pools? */ spa = STAILQ_FIRST(&zfs_pools); if (spa == NULL) return (buf); if (dev->pool_guid == 0) 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') snprintf(buf, sizeof(buf), "%s:%s:", dev->dd.d_dev->dv_name, spa->spa_name); else snprintf(buf, sizeof(buf), "%s:%s/%s:", dev->dd.d_dev->dv_name, spa->spa_name, rootname); return (buf); } static int split_devname(const char *name, char *poolname, size_t size, const char **dsnamep) { const char *dsname; size_t len; ASSERT(name != NULL); ASSERT(poolname != NULL); len = strlen(name); dsname = strchr(name, '/'); if (dsname != NULL) { len = dsname - name; dsname++; } else dsname = ""; if (len + 1 > size) return (EINVAL); strlcpy(poolname, name, len + 1); if (dsnamep != NULL) *dsnamep = dsname; return (0); } int zfs_list(const char *name) { static char poolname[ZFS_MAXNAMELEN]; uint64_t objid; spa_t *spa; const char *dsname; int rv; if (split_devname(name, poolname, sizeof(poolname), &dsname) != 0) return (EINVAL); 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_boot_options(const char *currdev_in) { char poolname[ZFS_MAXNAMELEN]; char *beroot, *currdev; spa_t *spa; int currdev_len; const char *dsname; currdev = NULL; currdev_len = strlen(currdev_in); if (currdev_len == 0) return; if (strncmp(currdev_in, "zfs:", 4) != 0) return; currdev = strdup(currdev_in); if (currdev == NULL) return; /* Remove the trailing : */ currdev[currdev_len - 1] = '\0'; setenv("zfs_be_active", currdev, 1); setenv("zfs_be_currpage", "1", 1); /* Remove the last element (current bootenv) */ beroot = strrchr(currdev, '/'); if (beroot != NULL) beroot[0] = '\0'; beroot = strchr(currdev, ':') + 1; setenv("zfs_be_root", beroot, 1); if (split_devname(beroot, poolname, sizeof(poolname), &dsname) != 0) return; spa = spa_find_by_name(poolname); if (spa == NULL) return; zfs_bootenv_initial("bootenvs", spa, beroot, dsname, 0); zfs_checkpoints_initial(spa, beroot, dsname); free(currdev); } static void zfs_checkpoints_initial(spa_t *spa, const char *name, const char *dsname) { char envname[32]; if (spa->spa_uberblock_checkpoint.ub_checkpoint_txg != 0) { snprintf(envname, sizeof(envname), "zpool_checkpoint"); setenv(envname, name, 1); spa->spa_uberblock = &spa->spa_uberblock_checkpoint; spa->spa_mos = &spa->spa_mos_checkpoint; zfs_bootenv_initial("bootenvs_check", spa, name, dsname, 1); spa->spa_uberblock = &spa->spa_uberblock_master; spa->spa_mos = &spa->spa_mos_master; } } static void zfs_bootenv_initial(const char *envprefix, spa_t *spa, const char *rootname, const char *dsname, int checkpoint) { char envname[32], envval[256]; uint64_t objid; int bootenvs_idx, rv; SLIST_INIT(&zfs_be_head); zfs_env_count = 0; rv = zfs_lookup_dataset(spa, dsname, &objid); if (rv != 0) return; rv = zfs_callback_dataset(spa, objid, zfs_belist_add); bootenvs_idx = 0; /* Populate the initial environment variables */ SLIST_FOREACH_SAFE(zfs_be, &zfs_be_head, entries, zfs_be_tmp) { /* Enumerate all bootenvs for general usage */ snprintf(envname, sizeof(envname), "%s[%d]", envprefix, bootenvs_idx); snprintf(envval, sizeof(envval), "zfs:%s%s/%s", checkpoint ? "!" : "", rootname, zfs_be->name); rv = setenv(envname, envval, 1); if (rv != 0) break; bootenvs_idx++; } snprintf(envname, sizeof(envname), "%s_count", envprefix); snprintf(envval, sizeof(envval), "%d", bootenvs_idx); setenv(envname, envval, 1); /* 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->name); free(zfs_be); } } int zfs_bootenv(const char *name) { char poolname[ZFS_MAXNAMELEN], *root; const char *dsname; char becount[4]; uint64_t objid; spa_t *spa; int 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; if (split_devname(name, poolname, sizeof(poolname), &dsname) != 0) return (EINVAL); 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->name); 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 = strdup(name); if (zfs_be->name == NULL) { free(zfs_be); return (ENOMEM); } 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); }