Author: kevans Date: Wed Feb 21 16:26:16 2018 New Revision: 329727 URL: https://svnweb.freebsd.org/changeset/base/329727
Log: stand/zfs: Add all bootenvs to environment For the benefit of lualoader, add all bootenvs to environment when init_zfs_bootenv is invoked. All of the boot environment logic can then be implemented in pure lua, rather than going back and forth with C to implement paging. This stores all boot environments in bootenvs[idx] and the final count of bootenvs in bootenvs_count. While here, make a copy of currdev for init_zfs_bootenv since it will be modifying it and the caller may not necessarily want that. Some of the logic was shifted around so that the 'currdev' pointer remains at the beginning of the string and 'beroot' is moved around as needed to modify it or ultimately store it in zfs_be_root. The original zfs_bootenv that this was copied from will be able to go away only if/when forth eventually goes away. Tested with: lualoader (and local changes to add boot env. support) Tested with: forth Reviewed by: cem (earlier version), imp Differential Revision: https://reviews.freebsd.org/D14435 Modified: head/stand/zfs/libzfs.h head/stand/zfs/zfs.c Modified: head/stand/zfs/libzfs.h ============================================================================== --- head/stand/zfs/libzfs.h Wed Feb 21 15:58:00 2018 (r329726) +++ head/stand/zfs/libzfs.h Wed Feb 21 16:26:16 2018 (r329727) @@ -82,7 +82,7 @@ char *zfs_fmtdev(void *vdev); int zfs_probe_dev(const char *devname, uint64_t *pool_guid); int zfs_list(const char *name); uint64_t ldi_get_size(void *); -void init_zfs_bootenv(char *currdev); +void init_zfs_bootenv(const char *currdev); int zfs_bootenv(const char *name); int zfs_belist_add(const char *name, uint64_t __unused); int zfs_set_env(void); Modified: head/stand/zfs/zfs.c ============================================================================== --- head/stand/zfs/zfs.c Wed Feb 21 15:58:00 2018 (r329726) +++ head/stand/zfs/zfs.c Wed Feb 21 16:26:16 2018 (r329727) @@ -60,8 +60,10 @@ static off_t zfs_seek(struct open_file *f, off_t offse 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; +static void zfs_bootenv_initial(const char *); +truct devsw zfs_dev; + struct fs_ops zfs_fsops = { "zfs", zfs_open, @@ -770,27 +772,83 @@ zfs_list(const char *name) } void -init_zfs_bootenv(char *currdev) +init_zfs_bootenv(const char *currdev_in) { - char *beroot; + char *beroot, *currdev; + int currdev_len; - if (strlen(currdev) == 0) + currdev = NULL; + currdev_len = strlen(currdev_in); + if (currdev_len == 0) return; - if(strncmp(currdev, "zfs:", 4) != 0) + if (strncmp(currdev_in, "zfs:", 4) != 0) return; + currdev = strdup(currdev_in); + if (currdev == NULL) + return; /* Remove the trailing : */ - currdev[strlen(currdev) - 1] = '\0'; + currdev[currdev_len - 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; + beroot = strchr(currdev, ':') + 1; setenv("zfs_be_root", beroot, 1); + zfs_bootenv_initial(beroot); + free(currdev); +} + +static void +zfs_bootenv_initial(const char *name) +{ + char poolname[ZFS_MAXNAMELEN], *dsname; + char envname[32], envval[256]; + uint64_t objid; + spa_t *spa; + int bootenvs_idx, len, rv; + + SLIST_INIT(&zfs_be_head); + zfs_env_count = 0; + len = strlen(name); + dsname = strchr(name, '/'); + if (dsname != NULL) { + len = dsname - name; + dsname++; + } else + dsname = ""; + strlcpy(poolname, name, len + 1); + spa = spa_find_by_name(poolname); + if (spa == NULL) + return; + 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), "bootenvs[%d]", bootenvs_idx); + snprintf(envval, sizeof(envval), "zfs:%s/%s", name, zfs_be->name); + rv = setenv(envname, envval, 1); + if (rv != 0) + break; + bootenvs_idx++; + } + snprintf(envval, sizeof(envval), "%d", bootenvs_idx); + setenv("bootenvs_count", 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); + } + + return; + } int _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
