/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2008 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #include <libzfs.h> #undef verify /* both libzfs.h and zfs_context.h want to define this */ #include <sys/zfs_context.h> #include <errno.h> #include <fcntl.h> #include <stdarg.h> #include <stddef.h> #include <stdio.h> #include <stdlib.h> #include <strings.h> #include <sys/file.h> #include <sys/mntent.h> #include <sys/mnttab.h> #include <sys/param.h> #include <sys/stat.h> #include <sys/dmu.h> #include <sys/dmu_objset.h> #include <sys/dnode.h> #include <sys/vdev_impl.h> #include <sys/mkdev.h> #include "zinject.h" extern void kernel_init(int); extern void kernel_fini(void); static int debug; static void ziprintf(const char *fmt, ...) { va_list ap; if (!debug) return; va_start(ap, fmt); (void) vprintf(fmt, ap); va_end(ap); } /* * Given a full path to a file, translate into a dataset name and a relative * path within the dataset. 'dataset' must be at least MAXNAMELEN characters, * and 'relpath' must be at least MAXPATHLEN characters. We also pass a stat64 * buffer, which we need later to get the object ID. */ static int parse_pathname(const char *fullpath, char *dataset, char *relpath, struct stat64 *statbuf) { struct extmnttab mp; FILE *fp; int match; const char *rel; if (fullpath[0] != '/') { (void) fprintf(stderr, "invalid object '%s': must be full " "path\n", fullpath); usage(); return (-1); } if (strlen(fullpath) >= MAXPATHLEN) { (void) fprintf(stderr, "invalid object; pathname too long\n"); return (-1); } if (stat64(fullpath, statbuf) != 0) { (void) fprintf(stderr, "cannot open '%s': %s\n", fullpath, strerror(errno)); return (-1); } if ((fp = fopen(MNTTAB, "r")) == NULL) { (void) fprintf(stderr, "cannot open /etc/mnttab\n"); return (-1); } match = 0; while (getextmntent(fp, &mp, sizeof (mp)) == 0) { if (makedev(mp.mnt_major, mp.mnt_minor) == statbuf->st_dev) { match = 1; break; } } if (!match) { (void) fprintf(stderr, "cannot find mountpoint for '%s'\n", fullpath); return (-1); } if (strcmp(mp.mnt_fstype, MNTTYPE_ZFS) != 0) { (void) fprintf(stderr, "invalid path '%s': not a ZFS " "filesystem\n", fullpath); return (-1); } if (strncmp(fullpath, mp.mnt_mountp, strlen(mp.mnt_mountp)) != 0) { (void) fprintf(stderr, "invalid path '%s': mountpoint " "doesn't match path\n", fullpath); return (-1); } (void) strcpy(dataset, mp.mnt_special); rel = fullpath + strlen(mp.mnt_mountp); if (rel[0] == '/') rel++; (void) strcpy(relpath, rel); return (0); } /* * Convert from a (dataset, path) pair into a (objset, object) pair. Note that * we grab the object number from the inode number, since looking this up via * libzpool is a real pain. */ /* ARGSUSED */ static int object_from_path(const char *dataset, const char *path, struct stat64 *statbuf, zinject_record_t *record) { objset_t *os; int err; /* * Before doing any libzpool operations, call sync() to ensure that the * on-disk state is consistent with the in-core state. */ sync(); if ((err = dmu_objset_open(dataset, DMU_OST_ZFS, DS_MODE_USER | DS_MODE_READONLY, &os)) != 0) { (void) fprintf(stderr, "cannot open dataset '%s': %s\n", dataset, strerror(err)); return (-1); } record->zi_objset = dmu_objset_id(os); record->zi_object = statbuf->st_ino; dmu_objset_close(os); return (0); } /* * Calculate the real range based on the type, level, and range given. */ static int calculate_range(const char *dataset, err_type_t type, int level, char *range, zinject_record_t *record) { objset_t *os = NULL; dnode_t *dn = NULL; int err; int ret = -1; /* * Determine the numeric range from the string. */ if (range == NULL) { /* * If range is unspecified, set the range to [0,-1], which * indicates that the whole object should be treated as an * error. */ record->zi_start = 0; record->zi_end = -1ULL; } else { char *end; /* XXX add support for suffixes */ record->zi_start = strtoull(range, &end, 10); if (*end == '\0') record->zi_end = record->zi_start + 1; else if (*end == ',') record->zi_end = strtoull(end + 1, &end, 10); if (*end != '\0') { (void) fprintf(stderr, "invalid range '%s': must be " "a numeric range of the form 'start[,end]'\n", range); goto out; } } switch (type) { default: break; case TYPE_DATA: break; case TYPE_DNODE: /* * If this is a request to inject faults into the dnode, then we * must translate the current (objset,object) pair into an * offset within the metadnode for the objset. Specifying any * kind of range with type 'dnode' is illegal. */ if (range != NULL) { (void) fprintf(stderr, "range cannot be specified when " "type is 'dnode'\n"); goto out; } record->zi_start = record->zi_object * sizeof (dnode_phys_t); record->zi_end = record->zi_start + sizeof (dnode_phys_t); record->zi_object = 0; break; } /* * Get the dnode associated with object, so we can calculate the block * size. */ if ((err = dmu_objset_open(dataset, DMU_OST_ANY, DS_MODE_USER | DS_MODE_READONLY, &os)) != 0) { (void) fprintf(stderr, "cannot open dataset '%s': %s\n", dataset, strerror(err)); goto out; } if (record->zi_object == 0) { dn = os->os->os_meta_dnode; } else { err = dnode_hold(os->os, record->zi_object, FTAG, &dn); if (err != 0) { (void) fprintf(stderr, "failed to hold dnode " "for object %llu\n", (u_longlong_t)record->zi_object); goto out; } } ziprintf("data shift: %d\n", (int)dn->dn_datablkshift); ziprintf(" ind shift: %d\n", (int)dn->dn_indblkshift); /* * Translate range into block IDs. */ if (record->zi_start != 0 || record->zi_end != -1ULL) { record->zi_start >>= dn->dn_datablkshift; record->zi_end >>= dn->dn_datablkshift; } /* * Check level, and then translate level 0 blkids into ranges * appropriate for level of indirection. */ record->zi_level = level; if (level > 0) { ziprintf("level 0 blkid range: [%llu, %llu]\n", record->zi_start, record->zi_end); if (level >= dn->dn_nlevels) { (void) fprintf(stderr, "level %d exceeds max level " "of object (%d)\n", level, dn->dn_nlevels - 1); goto out; } if (record->zi_start != 0 || record->zi_end != 0) { int shift = dn->dn_indblkshift - SPA_BLKPTRSHIFT; for (; level > 0; level--) { record->zi_start >>= shift; record->zi_end >>= shift; } } } ret = 0; out: if (dn) { if (dn != os->os->os_meta_dnode) dnode_rele(dn, FTAG); } if (os) dmu_objset_close(os); return (ret); } int translate_record(err_type_t type, const char *object, const char *range, int level, zinject_record_t *record, char *poolname, char *dataset) { char path[MAXPATHLEN]; char *slash; struct stat64 statbuf; int ret = -1; kernel_init(FREAD); debug = (getenv("ZINJECT_DEBUG") != NULL); ziprintf("translating: %s\n", object); if (MOS_TYPE(type)) { /* * MOS objects are treated specially. */ switch (type) { default: break; case TYPE_MOS: record->zi_type = 0; break; case TYPE_MOSDIR: record->zi_type = DMU_OT_OBJECT_DIRECTORY; break; case TYPE_METASLAB: record->zi_type = DMU_OT_OBJECT_ARRAY; break; case TYPE_CONFIG: record->zi_type = DMU_OT_PACKED_NVLIST; break; case TYPE_BPLIST: record->zi_type = DMU_OT_BPLIST; break; case TYPE_SPACEMAP: record->zi_type = DMU_OT_SPACE_MAP; break; case TYPE_ERRLOG: record->zi_type = DMU_OT_ERROR_LOG; break; } dataset[0] = '\0'; (void) strcpy(poolname, object); return (0); } /* * Convert a full path into a (dataset, file) pair. */ if (parse_pathname(object, dataset, path, &statbuf) != 0) goto err; ziprintf(" dataset: %s\n", dataset); ziprintf(" path: %s\n", path); /* * Convert (dataset, file) into (objset, object) */ if (object_from_path(dataset, path, &statbuf, record) != 0) goto err; ziprintf("raw objset: %llu\n", record->zi_objset); ziprintf("raw object: %llu\n", record->zi_object); /* * For the given object, calculate the real (type, level, range) */ if (calculate_range(dataset, type, level, (char *)range, record) != 0) goto err; ziprintf(" objset: %llu\n", record->zi_objset); ziprintf(" object: %llu\n", record->zi_object); if (record->zi_start == 0 && record->zi_end == -1ULL) ziprintf(" range: all\n"); else ziprintf(" range: [%llu, %llu]\n", record->zi_start, record->zi_end); /* * Copy the pool name */ (void) strcpy(poolname, dataset); if ((slash = strchr(poolname, '/')) != NULL) *slash = '\0'; ret = 0; err: kernel_fini(); return (ret); } int translate_raw(const char *str, zinject_record_t *record) { /* * A raw bookmark of the form objset:object:level:blkid, where each * number is a hexidecimal value. */ if (sscanf(str, "%llx:%llx:%x:%llx", (u_longlong_t *)&record->zi_objset, (u_longlong_t *)&record->zi_object, &record->zi_level, (u_longlong_t *)&record->zi_start) != 4) { (void) fprintf(stderr, "bad raw spec '%s': must be of the form " "'objset:object:level:blkid'\n", str); return (-1); } record->zi_end = record->zi_start; return (0); } int translate_device(const char *pool, const char *device, err_type_t label_type, zinject_record_t *record) { char *end; zpool_handle_t *zhp; nvlist_t *tgt; boolean_t isspare, iscache; /* * Given a device name or GUID, create an appropriate injection record * with zi_guid set. */ if ((zhp = zpool_open(g_zfs, pool)) == NULL) return (-1); record->zi_guid = strtoull(device, &end, 16); if (record->zi_guid == 0 || *end != '\0') { tgt = zpool_find_vdev(zhp, device, &isspare, &iscache, NULL); if (tgt == NULL) { (void) fprintf(stderr, "cannot find device '%s' in " "pool '%s'\n", device, pool); return (-1); } verify(nvlist_lookup_uint64(tgt, ZPOOL_CONFIG_GUID, &record->zi_guid) == 0); } switch (label_type) { default: break; case TYPE_LABEL_UBERBLOCK: record->zi_start = offsetof(vdev_label_t, vl_uberblock[0]); record->zi_end = record->zi_start + VDEV_UBERBLOCK_RING - 1; break; case TYPE_LABEL_NVLIST: record->zi_start = offsetof(vdev_label_t, vl_vdev_phys); record->zi_end = record->zi_start + VDEV_PHYS_SIZE - 1; break; } return (0); }