1 files changed, 0 insertions, 440 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c b/sys/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c
deleted file mode 100644
index c52acaf..0000000
--- a/sys/contrib/opensolaris/uts/common/fs/zfs/spa_errlog.c
+++ /dev/null
@@ -1,440 +0,0 @@
-/*
- * 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 2006 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-#pragma ident	"%Z%%M%	%I%	%E% SMI"
-
-/*
- * Routines to manage the on-disk persistent error log.
- *
- * Each pool stores a log of all logical data errors seen during normal
- * operation.  This is actually the union of two distinct logs: the last log,
- * and the current log.  All errors seen are logged to the current log.  When a
- * scrub completes, the current log becomes the last log, the last log is thrown
- * out, and the current log is reinitialized.  This way, if an error is somehow
- * corrected, a new scrub will show that that it no longer exists, and will be
- * deleted from the log when the scrub completes.
- *
- * The log is stored using a ZAP object whose key is a string form of the
- * zbookmark tuple (objset, object, level, blkid), and whose contents is an
- * optional 'objset:object' human-readable string describing the data.  When an
- * error is first logged, this string will be empty, indicating that no name is
- * known.  This prevents us from having to issue a potentially large amount of
- * I/O to discover the object name during an error path.  Instead, we do the
- * calculation when the data is requested, storing the result so future queries
- * will be faster.
- *
- * This log is then shipped into an nvlist where the key is the dataset name and
- * the value is the object name.  Userland is then responsible for uniquifying
- * this list and displaying it to the user.
- */
-
-#include <sys/dmu_tx.h>
-#include <sys/spa.h>
-#include <sys/spa_impl.h>
-#include <sys/zap.h>
-#include <sys/zio.h>
-
-/*
- * This is a stripped-down version of strtoull, suitable only for converting
- * lowercase hexidecimal numbers that don't overflow.
- */
-#ifdef _KERNEL
-static uint64_t
-_strtonum(char *str, char **nptr)
-{
-	uint64_t val = 0;
-	char c;
-	int digit;
-
-	while ((c = *str) != '\0') {
-		if (c >= '0' && c <= '9')
-			digit = c - '0';
-		else if (c >= 'a' && c <= 'f')
-			digit = 10 + c - 'a';
-		else
-			break;
-
-		val *= 16;
-		val += digit;
-
-		str++;
-	}
-
-	*nptr = str;
-
-	return (val);
-}
-#endif
-
-/*
- * Convert a bookmark to a string.
- */
-static void
-bookmark_to_name(zbookmark_t *zb, char *buf, size_t len)
-{
-	(void) snprintf(buf, len, "%llx:%llx:%llx:%llx",
-	    (u_longlong_t)zb->zb_objset, (u_longlong_t)zb->zb_object,
-	    (u_longlong_t)zb->zb_level, (u_longlong_t)zb->zb_blkid);
-}
-
-/*
- * Convert a string to a bookmark
- */
-#ifdef _KERNEL
-static void
-name_to_bookmark(char *buf, zbookmark_t *zb)
-{
-	zb->zb_objset = _strtonum(buf, &buf);
-	ASSERT(*buf == ':');
-	zb->zb_object = _strtonum(buf + 1, &buf);
-	ASSERT(*buf == ':');
-	zb->zb_level = (int)_strtonum(buf + 1, &buf);
-	ASSERT(*buf == ':');
-	zb->zb_blkid = _strtonum(buf + 1, &buf);
-	ASSERT(*buf == '\0');
-}
-#endif
-
-/*
- * Log an uncorrectable error to the persistent error log.  We add it to the
- * spa's list of pending errors.  The changes are actually synced out to disk
- * during spa_errlog_sync().
- */
-void
-spa_log_error(spa_t *spa, zio_t *zio)
-{
-	zbookmark_t *zb = &zio->io_logical->io_bookmark;
-	spa_error_entry_t search;
-	spa_error_entry_t *new;
-	avl_tree_t *tree;
-	avl_index_t where;
-
-	/*
-	 * If we are trying to import a pool, ignore any errors, as we won't be
-	 * writing to the pool any time soon.
-	 */
-	if (spa->spa_load_state == SPA_LOAD_TRYIMPORT)
-		return;
-
-	mutex_enter(&spa->spa_errlist_lock);
-
-	/*
-	 * If we have had a request to rotate the log, log it to the next list
-	 * instead of the current one.
-	 */
-	if (spa->spa_scrub_active || spa->spa_scrub_finished)
-		tree = &spa->spa_errlist_scrub;
-	else
-		tree = &spa->spa_errlist_last;
-
-	search.se_bookmark = *zb;
-	if (avl_find(tree, &search, &where) != NULL) {
-		mutex_exit(&spa->spa_errlist_lock);
-		return;
-	}
-
-	new = kmem_zalloc(sizeof (spa_error_entry_t), KM_SLEEP);
-	new->se_bookmark = *zb;
-	avl_insert(tree, new, where);
-
-	mutex_exit(&spa->spa_errlist_lock);
-}
-
-/*
- * Return the number of errors currently in the error log.  This is actually the
- * sum of both the last log and the current log, since we don't know the union
- * of these logs until we reach userland.
- */
-uint64_t
-spa_get_errlog_size(spa_t *spa)
-{
-	uint64_t total = 0, count;
-
-	mutex_enter(&spa->spa_errlog_lock);
-	if (spa->spa_errlog_scrub != 0 &&
-	    zap_count(spa->spa_meta_objset, spa->spa_errlog_scrub,
-	    &count) == 0)
-		total += count;
-
-	if (spa->spa_errlog_last != 0 && !spa->spa_scrub_finished &&
-	    zap_count(spa->spa_meta_objset, spa->spa_errlog_last,
-	    &count) == 0)
-		total += count;
-	mutex_exit(&spa->spa_errlog_lock);
-
-	mutex_enter(&spa->spa_errlist_lock);
-	total += avl_numnodes(&spa->spa_errlist_last);
-	total += avl_numnodes(&spa->spa_errlist_scrub);
-	mutex_exit(&spa->spa_errlist_lock);
-
-	return (total);
-}
-
-#ifdef _KERNEL
-static int
-process_error_log(spa_t *spa, uint64_t obj, void *addr, size_t *count)
-{
-	zap_cursor_t zc;
-	zap_attribute_t za;
-	zbookmark_t zb;
-
-	if (obj == 0)
-		return (0);
-
-	for (zap_cursor_init(&zc, spa->spa_meta_objset, obj);
-	    zap_cursor_retrieve(&zc, &za) == 0;
-	    zap_cursor_advance(&zc)) {
-
-		if (*count == 0) {
-			zap_cursor_fini(&zc);
-			return (ENOMEM);
-		}
-
-		name_to_bookmark(za.za_name, &zb);
-
-		if (copyout(&zb, (char *)addr +
-		    (*count - 1) * sizeof (zbookmark_t),
-		    sizeof (zbookmark_t)) != 0)
-			return (EFAULT);
-
-		*count -= 1;
-	}
-
-	zap_cursor_fini(&zc);
-
-	return (0);
-}
-
-static int
-process_error_list(avl_tree_t *list, void *addr, size_t *count)
-{
-	spa_error_entry_t *se;
-
-	for (se = avl_first(list); se != NULL; se = AVL_NEXT(list, se)) {
-
-		if (*count == 0)
-			return (ENOMEM);
-
-		if (copyout(&se->se_bookmark, (char *)addr +
-		    (*count - 1) * sizeof (zbookmark_t),
-		    sizeof (zbookmark_t)) != 0)
-			return (EFAULT);
-
-		*count -= 1;
-	}
-
-	return (0);
-}
-#endif
-
-/*
- * Copy all known errors to userland as an array of bookmarks.  This is
- * actually a union of the on-disk last log and current log, as well as any
- * pending error requests.
- *
- * Because the act of reading the on-disk log could cause errors to be
- * generated, we have two separate locks: one for the error log and one for the
- * in-core error lists.  We only need the error list lock to log and error, so
- * we grab the error log lock while we read the on-disk logs, and only pick up
- * the error list lock when we are finished.
- */
-int
-spa_get_errlog(spa_t *spa, void *uaddr, size_t *count)
-{
-	int ret = 0;
-
-#ifdef _KERNEL
-	mutex_enter(&spa->spa_errlog_lock);
-
-	ret = process_error_log(spa, spa->spa_errlog_scrub, uaddr, count);
-
-	if (!ret && !spa->spa_scrub_finished)
-		ret = process_error_log(spa, spa->spa_errlog_last, uaddr,
-		    count);
-
-	mutex_enter(&spa->spa_errlist_lock);
-	if (!ret)
-		ret = process_error_list(&spa->spa_errlist_scrub, uaddr,
-		    count);
-	if (!ret)
-		ret = process_error_list(&spa->spa_errlist_last, uaddr,
-		    count);
-	mutex_exit(&spa->spa_errlist_lock);
-
-	mutex_exit(&spa->spa_errlog_lock);
-#endif
-
-	return (ret);
-}
-
-/*
- * Called when a scrub completes.  This simply set a bit which tells which AVL
- * tree to add new errors.  spa_errlog_sync() is responsible for actually
- * syncing the changes to the underlying objects.
- */
-void
-spa_errlog_rotate(spa_t *spa)
-{
-	mutex_enter(&spa->spa_errlist_lock);
-
-	ASSERT(!spa->spa_scrub_finished);
-	spa->spa_scrub_finished = B_TRUE;
-
-	mutex_exit(&spa->spa_errlist_lock);
-}
-
-/*
- * Discard any pending errors from the spa_t.  Called when unloading a faulted
- * pool, as the errors encountered during the open cannot be synced to disk.
- */
-void
-spa_errlog_drain(spa_t *spa)
-{
-	spa_error_entry_t *se;
-	void *cookie;
-
-	mutex_enter(&spa->spa_errlist_lock);
-
-	cookie = NULL;
-	while ((se = avl_destroy_nodes(&spa->spa_errlist_last,
-	    &cookie)) != NULL)
-		kmem_free(se, sizeof (spa_error_entry_t));
-	cookie = NULL;
-	while ((se = avl_destroy_nodes(&spa->spa_errlist_scrub,
-	    &cookie)) != NULL)
-		kmem_free(se, sizeof (spa_error_entry_t));
-
-	mutex_exit(&spa->spa_errlist_lock);
-}
-
-/*
- * Process a list of errors into the current on-disk log.
- */
-static void
-sync_error_list(spa_t *spa, avl_tree_t *t, uint64_t *obj, dmu_tx_t *tx)
-{
-	spa_error_entry_t *se;
-	char buf[64];
-	void *cookie;
-
-	if (avl_numnodes(t) != 0) {
-		/* create log if necessary */
-		if (*obj == 0)
-			*obj = zap_create(spa->spa_meta_objset,
-			    DMU_OT_ERROR_LOG, DMU_OT_NONE,
-			    0, tx);
-
-		/* add errors to the current log */
-		for (se = avl_first(t); se != NULL; se = AVL_NEXT(t, se)) {
-			char *name = se->se_name ? se->se_name : "";
-
-			bookmark_to_name(&se->se_bookmark, buf, sizeof (buf));
-
-			(void) zap_update(spa->spa_meta_objset,
-			    *obj, buf, 1, strlen(name) + 1, name, tx);
-		}
-
-		/* purge the error list */
-		cookie = NULL;
-		while ((se = avl_destroy_nodes(t, &cookie)) != NULL)
-			kmem_free(se, sizeof (spa_error_entry_t));
-	}
-}
-
-/*
- * Sync the error log out to disk.  This is a little tricky because the act of
- * writing the error log requires the spa_errlist_lock.  So, we need to lock the
- * error lists, take a copy of the lists, and then reinitialize them.  Then, we
- * drop the error list lock and take the error log lock, at which point we
- * do the errlog processing.  Then, if we encounter an I/O error during this
- * process, we can successfully add the error to the list.  Note that this will
- * result in the perpetual recycling of errors, but it is an unlikely situation
- * and not a performance critical operation.
- */
-void
-spa_errlog_sync(spa_t *spa, uint64_t txg)
-{
-	dmu_tx_t *tx;
-	avl_tree_t scrub, last;
-	int scrub_finished;
-
-	mutex_enter(&spa->spa_errlist_lock);
-
-	/*
-	 * Bail out early under normal circumstances.
-	 */
-	if (avl_numnodes(&spa->spa_errlist_scrub) == 0 &&
-	    avl_numnodes(&spa->spa_errlist_last) == 0 &&
-	    !spa->spa_scrub_finished) {
-		mutex_exit(&spa->spa_errlist_lock);
-		return;
-	}
-
-	spa_get_errlists(spa, &last, &scrub);
-	scrub_finished = spa->spa_scrub_finished;
-	spa->spa_scrub_finished = B_FALSE;
-
-	mutex_exit(&spa->spa_errlist_lock);
-	mutex_enter(&spa->spa_errlog_lock);
-
-	tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg);
-
-	/*
-	 * Sync out the current list of errors.
-	 */
-	sync_error_list(spa, &last, &spa->spa_errlog_last, tx);
-
-	/*
-	 * Rotate the log if necessary.
-	 */
-	if (scrub_finished) {
-		if (spa->spa_errlog_last != 0)
-			VERIFY(dmu_object_free(spa->spa_meta_objset,
-			    spa->spa_errlog_last, tx) == 0);
-		spa->spa_errlog_last = spa->spa_errlog_scrub;
-		spa->spa_errlog_scrub = 0;
-
-		sync_error_list(spa, &scrub, &spa->spa_errlog_last, tx);
-	}
-
-	/*
-	 * Sync out any pending scrub errors.
-	 */
-	sync_error_list(spa, &scrub, &spa->spa_errlog_scrub, tx);
-
-	/*
-	 * Update the MOS to reflect the new values.
-	 */
-	(void) zap_update(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
-	    DMU_POOL_ERRLOG_LAST, sizeof (uint64_t), 1,
-	    &spa->spa_errlog_last, tx);
-	(void) zap_update(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT,
-	    DMU_POOL_ERRLOG_SCRUB, sizeof (uint64_t), 1,
-	    &spa->spa_errlog_scrub, tx);
-
-	dmu_tx_commit(tx);
-
-	mutex_exit(&spa->spa_errlog_lock);
-}