zfs_de.c revision 32b87932f3ef0887d873b7f6d2d1943799b2afc0
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9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States * Copyright 2008 Sun Microsystems, Inc. All rights reserved.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Use is subject to license terms.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw#pragma ident "%Z%%M% %I% %E% SMI"
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Our serd engines are named 'zfs_<pool_guid>_<vdev_guid>_{checksum,io}'. This
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * #define reserves enough space for two 64-bit hex values plus the length of
8d7e41661dc4633488e93b13363137523ce59977jose borrego * the longest string.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwtypedef struct zfs_case_data {
8d7e41661dc4633488e93b13363137523ce59977jose borregotypedef struct zfs_case {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Write out the persistent representation of an active case.
dc20a3024900c47dd2ee44b9707e6df38f7d62a5asstatic void
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Always update cases to the latest version, even if they were the
8d7e41661dc4633488e93b13363137523ce59977jose borrego * previous version when unserialized.
8d7e41661dc4633488e93b13363137523ce59977jose borrego zcp->zc_data.zc_version = CASE_DATA_VERSION_SERD;
8d7e41661dc4633488e93b13363137523ce59977jose borrego fmd_buf_write(hdl, zcp->zc_case, CASE_DATA, &zcp->zc_data,
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States * Read back the persistent representation of an active case.
8d7e41661dc4633488e93b13363137523ce59977jose borregozfs_case_unserialize(fmd_hdl_t *hdl, fmd_case_t *cp)
8d7e41661dc4633488e93b13363137523ce59977jose borrego zcp = fmd_hdl_zalloc(hdl, sizeof (zfs_case_t), FMD_SLEEP);
8d7e41661dc4633488e93b13363137523ce59977jose borrego fmd_buf_read(hdl, cp, CASE_DATA, &zcp->zc_data,
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (zcp->zc_data.zc_version > CASE_DATA_VERSION_SERD) {
8d7e41661dc4633488e93b13363137523ce59977jose borrego * fmd_buf_read() will have already zeroed out the remainder of the
8d7e41661dc4633488e93b13363137523ce59977jose borrego * buffer, so we don't have to do anything special if the version
8d7e41661dc4633488e93b13363137523ce59977jose borrego * doesn't include the SERD engine name.
8d7e41661dc4633488e93b13363137523ce59977jose borrego zcp->zc_serd_timer = fmd_timer_install(hdl, zcp,
8d7e41661dc4633488e93b13363137523ce59977jose borrego (void) uu_list_insert_before(zfs_cases, NULL, zcp);
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Iterate over any active cases. If any cases are associated with a pool or
8d7e41661dc4633488e93b13363137523ce59977jose borrego * vdev which is no longer present on the system, close the associated case.
8d7e41661dc4633488e93b13363137523ce59977jose borrego ret = nvlist_lookup_uint64(vd, ZPOOL_CONFIG_GUID, &vdev_guid);
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Mark any cases associated with this (pool, vdev) pair.
8d7e41661dc4633488e93b13363137523ce59977jose borrego for (zcp = uu_list_first(zfs_cases); zcp != NULL;
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Iterate over all children.
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (nvlist_lookup_nvlist_array(vd, ZPOOL_CONFIG_CHILDREN, &child,
8d7e41661dc4633488e93b13363137523ce59977jose borrego for (c = 0; c < children; c++)
8d7e41661dc4633488e93b13363137523ce59977jose borregozfs_mark_pool(zpool_handle_t *zhp, void *unused)
8d7e41661dc4633488e93b13363137523ce59977jose borrego pool_guid = zpool_get_prop_int(zhp, ZPOOL_PROP_GUID, NULL);
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Mark any cases associated with just this pool.
8d7e41661dc4633488e93b13363137523ce59977jose borrego for (zcp = uu_list_first(zfs_cases); zcp != NULL;
8d7e41661dc4633488e93b13363137523ce59977jose borrego if ((config = zpool_get_config(zhp, NULL)) == NULL)
8d7e41661dc4633488e93b13363137523ce59977jose borrego return (-1);
8d7e41661dc4633488e93b13363137523ce59977jose borrego ret = nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE, &vd);
8d7e41661dc4633488e93b13363137523ce59977jose borrego libzfs_handle_t *zhdl = fmd_hdl_getspecific(hdl);
8d7e41661dc4633488e93b13363137523ce59977jose borrego * There is no way to open a pool by GUID, or lookup a vdev by GUID. No
8d7e41661dc4633488e93b13363137523ce59977jose borrego * matter what we do, we're going to have to stomach a O(vdevs * cases)
8d7e41661dc4633488e93b13363137523ce59977jose borrego * algorithm. In reality, both quantities are likely so small that
8d7e41661dc4633488e93b13363137523ce59977jose borrego * neither will matter. Given that iterating over pools is more
8d7e41661dc4633488e93b13363137523ce59977jose borrego * expensive than iterating over the in-memory case list, we opt for a
8d7e41661dc4633488e93b13363137523ce59977jose borrego * 'present' flag in each case that starts off cleared. We then iterate
8d7e41661dc4633488e93b13363137523ce59977jose borrego * over all pools, marking those that are still present, and removing
8d7e41661dc4633488e93b13363137523ce59977jose borrego * those that aren't found.
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Note that we could also construct an FMRI and rely on
8d7e41661dc4633488e93b13363137523ce59977jose borrego * fmd_nvl_fmri_present(), but this would end up doing the same search.
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Mark the cases an not present.
8d7e41661dc4633488e93b13363137523ce59977jose borrego for (zcp = uu_list_first(zfs_cases); zcp != NULL;
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States /*
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States * Iterate over all pools and mark the pools and vdevs found. If this
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States * fails (most probably because we're out of memory), then don't close
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States * any of the cases and we cannot be sure they are accurate.
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States */
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (zpool_iter(zhdl, zfs_mark_pool, NULL) != 0)
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Remove those cases which were not found.
8d7e41661dc4633488e93b13363137523ce59977jose borrego walk = uu_list_walk_start(zfs_cases, UU_WALK_ROBUST);
8d7e41661dc4633488e93b13363137523ce59977jose borrego while ((zcp = uu_list_walk_next(walk)) != NULL) {
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Construct the name of a serd engine given the pool/vdev GUID and type (io or
8d7e41661dc4633488e93b13363137523ce59977jose borrego * checksum).
8d7e41661dc4633488e93b13363137523ce59977jose borregozfs_serd_name(char *buf, uint64_t pool_guid, uint64_t vdev_guid,
8d7e41661dc4633488e93b13363137523ce59977jose borrego const char *type)
8d7e41661dc4633488e93b13363137523ce59977jose borrego (void) snprintf(buf, MAX_SERDLEN, "zfs_%llx_%llx_%s", pool_guid,
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Solve a given ZFS case. This first checks to make sure the diagnosis is
8d7e41661dc4633488e93b13363137523ce59977jose borrego * still valid, as well as cleaning up any pending timer associated with the
8d7e41661dc4633488e93b13363137523ce59977jose borregozfs_case_solve(fmd_hdl_t *hdl, zfs_case_t *zcp, const char *faultname,
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Construct the detector from the case data. The detector is in the
8d7e41661dc4633488e93b13363137523ce59977jose borrego * ZFS scheme, and is either the pool or the vdev, depending on whether
8d7e41661dc4633488e93b13363137523ce59977jose borrego * this is a vdev or pool fault.
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (nvlist_alloc(&detector, NV_UNIQUE_NAME, 0) != 0)
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (nvlist_add_uint8(detector, FM_VERSION, ZFS_SCHEME_VERSION0) != 0 ||
8d7e41661dc4633488e93b13363137523ce59977jose borrego * We also want to make sure that the detector (pool or vdev) properly
8d7e41661dc4633488e93b13363137523ce59977jose borrego * reflects the diagnosed state, when the fault corresponds to internal
8d7e41661dc4633488e93b13363137523ce59977jose borrego * ZFS state (i.e. not checksum or I/O error-induced). Otherwise, a
8d7e41661dc4633488e93b13363137523ce59977jose borrego * device which was unavailable early in boot (because the driver/file
8d7e41661dc4633488e93b13363137523ce59977jose borrego * wasn't available) and is now healthy will be mis-diagnosed.
8d7e41661dc4633488e93b13363137523ce59977jose borrego (checkunusable && !fmd_nvl_fmri_unusable(hdl, detector))) {
8d7e41661dc4633488e93b13363137523ce59977jose borrego fault = fmd_nvl_create_fault(hdl, faultname, 100, detector, NULL,
8d7e41661dc4633488e93b13363137523ce59977jose borrego fmd_case_add_suspect(hdl, zcp->zc_case, fault);
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Main fmd entry point.
8d7e41661dc4633488e93b13363137523ce59977jose borregozfs_fm_recv(fmd_hdl_t *hdl, fmd_event_t *ep, nvlist_t *nvl, const char *class)
8d7e41661dc4633488e93b13363137523ce59977jose borrego const char *serd;
8d7e41661dc4633488e93b13363137523ce59977jose borrego isresource = fmd_nvl_class_match(hdl, nvl, "resource.fs.zfs.*");
8d7e41661dc4633488e93b13363137523ce59977jose borrego * For resources, we don't have a normal payload.
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (nvlist_lookup_uint64(nvl, FM_EREPORT_PAYLOAD_ZFS_VDEV_GUID,
8d7e41661dc4633488e93b13363137523ce59977jose borrego FM_EREPORT_PAYLOAD_ZFS_POOL_CONTEXT, &pool_state);
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States * We also ignore all ereports generated during an import of a pool,
8d7e41661dc4633488e93b13363137523ce59977jose borrego * since the only possible fault (.pool) would result in import failure,
8d7e41661dc4633488e93b13363137523ce59977jose borrego * and hence no persistent fault. Some day we may want to do something
8d7e41661dc4633488e93b13363137523ce59977jose borrego * with these ereports, so we continue generating them internally.
9fb67ea305c66b6a297583b9b0db6796b0dfe497afshin salek ardakani - Sun Microsystems - Irvine United States */
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Determine if this ereport corresponds to an open case. Cases are
8d7e41661dc4633488e93b13363137523ce59977jose borrego * indexed by ENA, since ZFS does all the work of chaining together
c8ec8eea9849cac239663c46be8a7f5d2ba7ca00jose borrego * related ereports.
c8ec8eea9849cac239663c46be8a7f5d2ba7ca00jose borrego * We also detect if an ereport corresponds to an open case by context,
8d7e41661dc4633488e93b13363137523ce59977jose borrego * - An error occurred during an open of a pool with an existing
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * - An error occurred for a device which already has an open
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (nvlist_lookup_uint64(nvl, FM_EREPORT_ENA, &ena) != 0)
dc20a3024900c47dd2ee44b9707e6df38f7d62a5as * Matches a known ENA.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Matches a case involving load errors for this same pool.
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Device errors for the same device.
8d7e41661dc4633488e93b13363137523ce59977jose borrego if (vdev_guid != 0 && zcp->zc_data.zc_vdev_guid == vdev_guid)
8d7e41661dc4633488e93b13363137523ce59977jose borrego * If this is one of our 'fake' resource ereports, and there is
8d7e41661dc4633488e93b13363137523ce59977jose borrego * no case open, simply discard it.
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Open a new case.
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Initialize the case buffer. To commonize code, we actually
8d7e41661dc4633488e93b13363137523ce59977jose borrego * create the buffer with existing data, and then call
8d7e41661dc4633488e93b13363137523ce59977jose borrego * zfs_case_unserialize() to instantiate the in-core structure.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw fmd_buf_write(hdl, cs, CASE_DATA, &data, sizeof (data));
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (fmd_nvl_class_match(hdl, nvl, "resource.fs.zfs.ok")) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * The 'resource.fs.zfs.ok' event is a special
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * internal-only event that signifies that a pool or
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * device that was previously faulted has now come
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * online (as detected by ZFS). This allows us to close
b89a8333f5e1f75ec0c269b22524bd2eccb972banatalie li - Sun Microsystems - Irvine United States * the associated case.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw "resource.fs.zfs.autoreplace")) {
b89a8333f5e1f75ec0c269b22524bd2eccb972banatalie li - Sun Microsystems - Irvine United States * The 'resource.fs.zfs.autoreplace' event indicates
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * that the pool was loaded with the 'autoreplace'
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * property set. In this case, any pending device
8d7e41661dc4633488e93b13363137523ce59977jose borrego * failures should be ignored, as the asynchronous
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * autoreplace handling will take care of them.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * The 'resource.fs.zfs.removed' event indicates that
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * device removal was detected, and the device was
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * closed asynchronously. If this is the case, we
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * assume that any recent I/O errors were due to the
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * device removal, not any fault of the device itself.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * We reset the SERD engine, and cancel any pending
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Associate the ereport with this case.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Don't do anything else if this case is already solved.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Determine if we should solve the case and generate a fault. We solve
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * a case if:
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * a. A pool failed to open (ereport.fs.zfs.pool)
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * b. A device failed to open (ereport.fs.zfs.pool) while a pool
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * was up and running.
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * We may see a series of ereports associated with a pool open, all
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * chained together by the same ENA. If the pool open succeeds, then
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * we'll see no further ereports. To detect when a pool open has
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * succeeded, we associate a timer with the event. When it expires, we
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * close the case.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (fmd_nvl_class_match(hdl, nvl, "ereport.fs.zfs.zpool")) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Pool level fault.
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego zfs_case_solve(hdl, zcp, "fault.fs.zfs.pool", B_TRUE);
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego } else if (fmd_nvl_class_match(hdl, nvl, "ereport.fs.zfs.vdev.*") &&
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * Device fault. Before solving the case, determine if the
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * device failed during open, and the 'autoreplace' property is
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * set. If this is the case, then we post a sysevent which is
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * picked up by the syseventd module, and any processing is done
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * as needed.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zfs_case_solve(hdl, zcp, "fault.fs.zfs.device", B_TRUE);
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Error incurred during a pool open. Reset the timer
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * associated with this case.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * If this is a checksum or I/O error, then toss it into the
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * appropriate SERD engine and check to see if it has fired.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Ideally, we want to do something more sophisticated,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * (persistent errors for a single data block, etc). For now,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * a single SERD engine is sufficient.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (fmd_nvl_class_match(hdl, nvl, "ereport.fs.zfs.io")) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw "ereport.fs.zfs.io_failure") && (nvlist_lookup_string(nvl,
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw FM_EREPORT_PAYLOAD_ZFS_POOL_FAILMODE, &failmode) == 0) &&
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw "fault.fs.zfs.io_failure_continue",
8d7e41661dc4633488e93b13363137523ce59977jose borrego * Because I/O errors may be due to device removal, we postpone
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * any diagnosis until we're sure that we aren't about to
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * receive a 'resource.fs.zfs.removed' event.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Timeout indicates one of two scenarios:
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * - The pool had faults but was eventually opened successfully.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * - We diagnosed an I/O error, and it was not due to device removal (which
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * would cause the timeout to be cancelled).
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw/* ARGSUSED */
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwstatic void
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw const char *faultname;
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwstatic void
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * We use the fmd gc entry point to look for old cases that no longer apply.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * This allows us to keep our set of case data small in a long running system.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amwstatic void
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if ((zfs_case_pool = uu_list_pool_create("zfs_case_pool",
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if ((zfs_cases = uu_list_create(zfs_case_pool, NULL, 0)) == NULL) {
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw if (fmd_hdl_register(hdl, FMD_API_VERSION, &fmd_info) != 0) {
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * Iterate over all active cases and unserialize the associated buffers,
7f667e74610492ddbce8ce60f52ece95d2401949jose borrego * adding them to our list of open cases.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Clear out any old cases that are no longer valid.
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zfs_case_timeout = fmd_prop_get_int64(hdl, "case_timeout");
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw zfs_serd_timeout = fmd_prop_get_int64(hdl, "serd_timeout");
da6c28aaf62fa55f0fdb8004aa40f88f23bf53f0amw * Remove all active cases.