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-rw-r--r--cmd/zinject/translate.c474
1 files changed, 474 insertions, 0 deletions
diff --git a/cmd/zinject/translate.c b/cmd/zinject/translate.c
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@@ -0,0 +1,474 @@
+/*
+ * 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) {
+ 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) {
+ 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) {
+ 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);
+}
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