author | Chris Kirby <Chris.Kirby@oracle.com> |
Thu, 10 Jun 2010 15:46:47 -0600 | |
changeset 12605 | 6790e683d5a5 |
parent 12296 | 7cf402a7f374 |
child 13980 | d7059eb1884c |
permissions | -rw-r--r-- |
1544 | 1 |
/* |
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* CDDL HEADER START |
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* |
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* The contents of this file are subject to the terms of the |
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* Common Development and Distribution License (the "License"). |
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* You may not use this file except in compliance with the License. |
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* |
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
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* or http://www.opensolaris.org/os/licensing. |
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* See the License for the specific language governing permissions |
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* and limitations under the License. |
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* |
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* When distributing Covered Code, include this CDDL HEADER in each |
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
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* If applicable, add the following below this CDDL HEADER, with the |
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* fields enclosed by brackets "[]" replaced with your own identifying |
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* information: Portions Copyright [yyyy] [name of copyright owner] |
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* |
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* CDDL HEADER END |
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*/ |
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/* |
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12296
7cf402a7f374
6675946 'zpool status' should show the progress of resilvering for individual disk.
Lin Ling <Lin.Ling@Sun.COM>
parents:
11147
diff
changeset
|
22 |
* Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved. |
1544 | 23 |
*/ |
24 |
||
25 |
/* |
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26 |
* Routines to manage the on-disk persistent error log. |
|
27 |
* |
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* Each pool stores a log of all logical data errors seen during normal |
|
29 |
* operation. This is actually the union of two distinct logs: the last log, |
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* and the current log. All errors seen are logged to the current log. When a |
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* scrub completes, the current log becomes the last log, the last log is thrown |
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* out, and the current log is reinitialized. This way, if an error is somehow |
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* corrected, a new scrub will show that that it no longer exists, and will be |
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* deleted from the log when the scrub completes. |
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35 |
* |
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36 |
* The log is stored using a ZAP object whose key is a string form of the |
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* zbookmark tuple (objset, object, level, blkid), and whose contents is an |
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38 |
* optional 'objset:object' human-readable string describing the data. When an |
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* error is first logged, this string will be empty, indicating that no name is |
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* known. This prevents us from having to issue a potentially large amount of |
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* I/O to discover the object name during an error path. Instead, we do the |
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* calculation when the data is requested, storing the result so future queries |
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* will be faster. |
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* |
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45 |
* This log is then shipped into an nvlist where the key is the dataset name and |
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* the value is the object name. Userland is then responsible for uniquifying |
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* this list and displaying it to the user. |
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48 |
*/ |
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49 |
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50 |
#include <sys/dmu_tx.h> |
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51 |
#include <sys/spa.h> |
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52 |
#include <sys/spa_impl.h> |
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53 |
#include <sys/zap.h> |
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54 |
#include <sys/zio.h> |
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55 |
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56 |
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57 |
/* |
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58 |
* Convert a bookmark to a string. |
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59 |
*/ |
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60 |
static void |
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bookmark_to_name(zbookmark_t *zb, char *buf, size_t len) |
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{ |
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63 |
(void) snprintf(buf, len, "%llx:%llx:%llx:%llx", |
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(u_longlong_t)zb->zb_objset, (u_longlong_t)zb->zb_object, |
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(u_longlong_t)zb->zb_level, (u_longlong_t)zb->zb_blkid); |
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} |
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67 |
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68 |
/* |
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* Convert a string to a bookmark |
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*/ |
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2856 | 71 |
#ifdef _KERNEL |
1544 | 72 |
static void |
73 |
name_to_bookmark(char *buf, zbookmark_t *zb) |
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{ |
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75 |
zb->zb_objset = strtonum(buf, &buf); |
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ASSERT(*buf == ':'); |
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zb->zb_object = strtonum(buf + 1, &buf); |
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ASSERT(*buf == ':'); |
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zb->zb_level = (int)strtonum(buf + 1, &buf); |
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ASSERT(*buf == ':'); |
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zb->zb_blkid = strtonum(buf + 1, &buf); |
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ASSERT(*buf == '\0'); |
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} |
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2856 | 84 |
#endif |
1544 | 85 |
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86 |
/* |
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* Log an uncorrectable error to the persistent error log. We add it to the |
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* spa's list of pending errors. The changes are actually synced out to disk |
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* during spa_errlog_sync(). |
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90 |
*/ |
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91 |
void |
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spa_log_error(spa_t *spa, zio_t *zio) |
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{ |
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zbookmark_t *zb = &zio->io_logical->io_bookmark; |
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95 |
spa_error_entry_t search; |
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spa_error_entry_t *new; |
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avl_tree_t *tree; |
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avl_index_t where; |
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100 |
/* |
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* If we are trying to import a pool, ignore any errors, as we won't be |
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* writing to the pool any time soon. |
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*/ |
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11147
74e8c05021f1
6678033 resilver code should prefetch
George Wilson <George.Wilson@Sun.COM>
parents:
10342
diff
changeset
|
104 |
if (spa_load_state(spa) == SPA_LOAD_TRYIMPORT) |
1544 | 105 |
return; |
106 |
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107 |
mutex_enter(&spa->spa_errlist_lock); |
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108 |
||
109 |
/* |
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110 |
* If we have had a request to rotate the log, log it to the next list |
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* instead of the current one. |
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112 |
*/ |
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113 |
if (spa->spa_scrub_active || spa->spa_scrub_finished) |
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114 |
tree = &spa->spa_errlist_scrub; |
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115 |
else |
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116 |
tree = &spa->spa_errlist_last; |
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117 |
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118 |
search.se_bookmark = *zb; |
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119 |
if (avl_find(tree, &search, &where) != NULL) { |
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mutex_exit(&spa->spa_errlist_lock); |
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121 |
return; |
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} |
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123 |
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new = kmem_zalloc(sizeof (spa_error_entry_t), KM_SLEEP); |
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new->se_bookmark = *zb; |
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avl_insert(tree, new, where); |
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mutex_exit(&spa->spa_errlist_lock); |
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129 |
} |
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130 |
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/* |
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* Return the number of errors currently in the error log. This is actually the |
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* sum of both the last log and the current log, since we don't know the union |
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* of these logs until we reach userland. |
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*/ |
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uint64_t |
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spa_get_errlog_size(spa_t *spa) |
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{ |
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uint64_t total = 0, count; |
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mutex_enter(&spa->spa_errlog_lock); |
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if (spa->spa_errlog_scrub != 0 && |
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zap_count(spa->spa_meta_objset, spa->spa_errlog_scrub, |
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&count) == 0) |
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total += count; |
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if (spa->spa_errlog_last != 0 && !spa->spa_scrub_finished && |
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zap_count(spa->spa_meta_objset, spa->spa_errlog_last, |
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&count) == 0) |
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total += count; |
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mutex_exit(&spa->spa_errlog_lock); |
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mutex_enter(&spa->spa_errlist_lock); |
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total += avl_numnodes(&spa->spa_errlist_last); |
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total += avl_numnodes(&spa->spa_errlist_scrub); |
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mutex_exit(&spa->spa_errlist_lock); |
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return (total); |
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} |
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160 |
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#ifdef _KERNEL |
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static int |
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process_error_log(spa_t *spa, uint64_t obj, void *addr, size_t *count) |
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{ |
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zap_cursor_t zc; |
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zap_attribute_t za; |
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zbookmark_t zb; |
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168 |
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if (obj == 0) |
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return (0); |
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171 |
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for (zap_cursor_init(&zc, spa->spa_meta_objset, obj); |
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zap_cursor_retrieve(&zc, &za) == 0; |
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zap_cursor_advance(&zc)) { |
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176 |
if (*count == 0) { |
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zap_cursor_fini(&zc); |
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return (ENOMEM); |
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} |
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180 |
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name_to_bookmark(za.za_name, &zb); |
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if (copyout(&zb, (char *)addr + |
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(*count - 1) * sizeof (zbookmark_t), |
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sizeof (zbookmark_t)) != 0) |
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return (EFAULT); |
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188 |
*count -= 1; |
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} |
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190 |
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zap_cursor_fini(&zc); |
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192 |
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return (0); |
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} |
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static int |
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process_error_list(avl_tree_t *list, void *addr, size_t *count) |
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{ |
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spa_error_entry_t *se; |
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200 |
||
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for (se = avl_first(list); se != NULL; se = AVL_NEXT(list, se)) { |
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202 |
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203 |
if (*count == 0) |
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return (ENOMEM); |
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205 |
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206 |
if (copyout(&se->se_bookmark, (char *)addr + |
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(*count - 1) * sizeof (zbookmark_t), |
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sizeof (zbookmark_t)) != 0) |
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return (EFAULT); |
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210 |
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211 |
*count -= 1; |
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} |
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213 |
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214 |
return (0); |
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} |
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#endif |
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217 |
||
218 |
/* |
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219 |
* Copy all known errors to userland as an array of bookmarks. This is |
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* actually a union of the on-disk last log and current log, as well as any |
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* pending error requests. |
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* |
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* Because the act of reading the on-disk log could cause errors to be |
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* generated, we have two separate locks: one for the error log and one for the |
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* in-core error lists. We only need the error list lock to log and error, so |
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* we grab the error log lock while we read the on-disk logs, and only pick up |
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* the error list lock when we are finished. |
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*/ |
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229 |
int |
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230 |
spa_get_errlog(spa_t *spa, void *uaddr, size_t *count) |
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231 |
{ |
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232 |
int ret = 0; |
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233 |
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234 |
#ifdef _KERNEL |
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235 |
mutex_enter(&spa->spa_errlog_lock); |
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236 |
||
237 |
ret = process_error_log(spa, spa->spa_errlog_scrub, uaddr, count); |
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238 |
||
239 |
if (!ret && !spa->spa_scrub_finished) |
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ret = process_error_log(spa, spa->spa_errlog_last, uaddr, |
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count); |
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242 |
||
243 |
mutex_enter(&spa->spa_errlist_lock); |
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244 |
if (!ret) |
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245 |
ret = process_error_list(&spa->spa_errlist_scrub, uaddr, |
|
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count); |
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247 |
if (!ret) |
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248 |
ret = process_error_list(&spa->spa_errlist_last, uaddr, |
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count); |
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250 |
mutex_exit(&spa->spa_errlist_lock); |
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251 |
||
252 |
mutex_exit(&spa->spa_errlog_lock); |
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253 |
#endif |
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254 |
||
255 |
return (ret); |
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256 |
} |
|
257 |
||
258 |
/* |
|
259 |
* Called when a scrub completes. This simply set a bit which tells which AVL |
|
260 |
* tree to add new errors. spa_errlog_sync() is responsible for actually |
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261 |
* syncing the changes to the underlying objects. |
|
262 |
*/ |
|
263 |
void |
|
264 |
spa_errlog_rotate(spa_t *spa) |
|
265 |
{ |
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266 |
mutex_enter(&spa->spa_errlist_lock); |
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267 |
spa->spa_scrub_finished = B_TRUE; |
|
268 |
mutex_exit(&spa->spa_errlist_lock); |
|
269 |
} |
|
270 |
||
271 |
/* |
|
272 |
* Discard any pending errors from the spa_t. Called when unloading a faulted |
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273 |
* pool, as the errors encountered during the open cannot be synced to disk. |
|
274 |
*/ |
|
275 |
void |
|
276 |
spa_errlog_drain(spa_t *spa) |
|
277 |
{ |
|
278 |
spa_error_entry_t *se; |
|
279 |
void *cookie; |
|
280 |
||
281 |
mutex_enter(&spa->spa_errlist_lock); |
|
282 |
||
283 |
cookie = NULL; |
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284 |
while ((se = avl_destroy_nodes(&spa->spa_errlist_last, |
|
285 |
&cookie)) != NULL) |
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286 |
kmem_free(se, sizeof (spa_error_entry_t)); |
|
287 |
cookie = NULL; |
|
288 |
while ((se = avl_destroy_nodes(&spa->spa_errlist_scrub, |
|
289 |
&cookie)) != NULL) |
|
290 |
kmem_free(se, sizeof (spa_error_entry_t)); |
|
291 |
||
292 |
mutex_exit(&spa->spa_errlist_lock); |
|
293 |
} |
|
294 |
||
295 |
/* |
|
296 |
* Process a list of errors into the current on-disk log. |
|
297 |
*/ |
|
298 |
static void |
|
299 |
sync_error_list(spa_t *spa, avl_tree_t *t, uint64_t *obj, dmu_tx_t *tx) |
|
300 |
{ |
|
301 |
spa_error_entry_t *se; |
|
302 |
char buf[64]; |
|
303 |
void *cookie; |
|
304 |
||
305 |
if (avl_numnodes(t) != 0) { |
|
306 |
/* create log if necessary */ |
|
307 |
if (*obj == 0) |
|
308 |
*obj = zap_create(spa->spa_meta_objset, |
|
309 |
DMU_OT_ERROR_LOG, DMU_OT_NONE, |
|
310 |
0, tx); |
|
311 |
||
312 |
/* add errors to the current log */ |
|
313 |
for (se = avl_first(t); se != NULL; se = AVL_NEXT(t, se)) { |
|
314 |
char *name = se->se_name ? se->se_name : ""; |
|
315 |
||
316 |
bookmark_to_name(&se->se_bookmark, buf, sizeof (buf)); |
|
317 |
||
318 |
(void) zap_update(spa->spa_meta_objset, |
|
319 |
*obj, buf, 1, strlen(name) + 1, name, tx); |
|
320 |
} |
|
321 |
||
322 |
/* purge the error list */ |
|
323 |
cookie = NULL; |
|
324 |
while ((se = avl_destroy_nodes(t, &cookie)) != NULL) |
|
325 |
kmem_free(se, sizeof (spa_error_entry_t)); |
|
326 |
} |
|
327 |
} |
|
328 |
||
329 |
/* |
|
330 |
* Sync the error log out to disk. This is a little tricky because the act of |
|
331 |
* writing the error log requires the spa_errlist_lock. So, we need to lock the |
|
332 |
* error lists, take a copy of the lists, and then reinitialize them. Then, we |
|
333 |
* drop the error list lock and take the error log lock, at which point we |
|
334 |
* do the errlog processing. Then, if we encounter an I/O error during this |
|
335 |
* process, we can successfully add the error to the list. Note that this will |
|
336 |
* result in the perpetual recycling of errors, but it is an unlikely situation |
|
337 |
* and not a performance critical operation. |
|
338 |
*/ |
|
339 |
void |
|
340 |
spa_errlog_sync(spa_t *spa, uint64_t txg) |
|
341 |
{ |
|
342 |
dmu_tx_t *tx; |
|
343 |
avl_tree_t scrub, last; |
|
344 |
int scrub_finished; |
|
345 |
||
346 |
mutex_enter(&spa->spa_errlist_lock); |
|
347 |
||
348 |
/* |
|
349 |
* Bail out early under normal circumstances. |
|
350 |
*/ |
|
351 |
if (avl_numnodes(&spa->spa_errlist_scrub) == 0 && |
|
352 |
avl_numnodes(&spa->spa_errlist_last) == 0 && |
|
353 |
!spa->spa_scrub_finished) { |
|
354 |
mutex_exit(&spa->spa_errlist_lock); |
|
355 |
return; |
|
356 |
} |
|
357 |
||
358 |
spa_get_errlists(spa, &last, &scrub); |
|
359 |
scrub_finished = spa->spa_scrub_finished; |
|
360 |
spa->spa_scrub_finished = B_FALSE; |
|
361 |
||
362 |
mutex_exit(&spa->spa_errlist_lock); |
|
363 |
mutex_enter(&spa->spa_errlog_lock); |
|
364 |
||
365 |
tx = dmu_tx_create_assigned(spa->spa_dsl_pool, txg); |
|
366 |
||
367 |
/* |
|
368 |
* Sync out the current list of errors. |
|
369 |
*/ |
|
370 |
sync_error_list(spa, &last, &spa->spa_errlog_last, tx); |
|
371 |
||
372 |
/* |
|
373 |
* Rotate the log if necessary. |
|
374 |
*/ |
|
375 |
if (scrub_finished) { |
|
376 |
if (spa->spa_errlog_last != 0) |
|
377 |
VERIFY(dmu_object_free(spa->spa_meta_objset, |
|
378 |
spa->spa_errlog_last, tx) == 0); |
|
379 |
spa->spa_errlog_last = spa->spa_errlog_scrub; |
|
380 |
spa->spa_errlog_scrub = 0; |
|
381 |
||
382 |
sync_error_list(spa, &scrub, &spa->spa_errlog_last, tx); |
|
383 |
} |
|
384 |
||
385 |
/* |
|
386 |
* Sync out any pending scrub errors. |
|
387 |
*/ |
|
388 |
sync_error_list(spa, &scrub, &spa->spa_errlog_scrub, tx); |
|
389 |
||
390 |
/* |
|
391 |
* Update the MOS to reflect the new values. |
|
392 |
*/ |
|
393 |
(void) zap_update(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
|
394 |
DMU_POOL_ERRLOG_LAST, sizeof (uint64_t), 1, |
|
395 |
&spa->spa_errlog_last, tx); |
|
396 |
(void) zap_update(spa->spa_meta_objset, DMU_POOL_DIRECTORY_OBJECT, |
|
397 |
DMU_POOL_ERRLOG_SCRUB, sizeof (uint64_t), 1, |
|
398 |
&spa->spa_errlog_scrub, tx); |
|
399 |
||
400 |
dmu_tx_commit(tx); |
|
401 |
||
402 |
mutex_exit(&spa->spa_errlog_lock); |
|
403 |
} |