diff options
Diffstat (limited to 'module/zfs/spa_errlog.c')
| -rw-r--r-- | module/zfs/spa_errlog.c | 910 |
1 files changed, 845 insertions, 65 deletions
diff --git a/module/zfs/spa_errlog.c b/module/zfs/spa_errlog.c index c6b28ea7d..9e5d1de63 100644 --- a/module/zfs/spa_errlog.c +++ b/module/zfs/spa_errlog.c @@ -20,7 +20,8 @@ */ /* * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved. - * Copyright (c) 2013, 2014 by Delphix. All rights reserved. + * Copyright (c) 2013, 2014, Delphix. All rights reserved. + * Copyright (c) 2021, George Amanakis. All rights reserved. */ /* @@ -43,6 +44,16 @@ * calculation when the data is requested, storing the result so future queries * will be faster. * + * If the head_errlog feature is enabled, a different on-disk format is used. + * The error log of each head dataset is stored separately in the zap object + * and keyed by the head id. This enables listing every dataset affected in + * userland. In order to be able to track whether an error block has been + * modified or added to snapshots since it was marked as an error, a new tuple + * is introduced: zbookmark_err_phys_t. It allows the storage of the birth + * transaction group of an error block on-disk. The birth transaction group is + * used by check_filesystem() to assess whether this block was freed, + * re-written or added to a snapshot since its marking as an error. + * * 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. @@ -53,7 +64,17 @@ #include <sys/spa_impl.h> #include <sys/zap.h> #include <sys/zio.h> +#include <sys/dsl_dir.h> +#include <sys/dmu_objset.h> +#include <sys/dbuf.h> +/* + * spa_upgrade_errlog_limit : A zfs module parameter that controls the number + * of on-disk error log entries that will be converted to the new + * format when enabling head_errlog. Defaults to 0 which converts + * all log entries. + */ +static uint32_t spa_upgrade_errlog_limit = 0; /* * Convert a bookmark to a string. @@ -67,9 +88,35 @@ bookmark_to_name(zbookmark_phys_t *zb, char *buf, size_t len) } /* - * Convert a string to a bookmark + * Convert an err_phys to a string. + */ +static void +errphys_to_name(zbookmark_err_phys_t *zep, char *buf, size_t len) +{ + (void) snprintf(buf, len, "%llx:%llx:%llx:%llx", + (u_longlong_t)zep->zb_object, (u_longlong_t)zep->zb_level, + (u_longlong_t)zep->zb_blkid, (u_longlong_t)zep->zb_birth); +} + +/* + * Convert a string to a err_phys. + */ +static void +name_to_errphys(char *buf, zbookmark_err_phys_t *zep) +{ + zep->zb_object = zfs_strtonum(buf, &buf); + ASSERT(*buf == ':'); + zep->zb_level = (int)zfs_strtonum(buf + 1, &buf); + ASSERT(*buf == ':'); + zep->zb_blkid = zfs_strtonum(buf + 1, &buf); + ASSERT(*buf == ':'); + zep->zb_birth = zfs_strtonum(buf + 1, &buf); + ASSERT(*buf == '\0'); +} + +/* + * Convert a string to a bookmark. */ -#ifdef _KERNEL static void name_to_bookmark(char *buf, zbookmark_phys_t *zb) { @@ -82,8 +129,74 @@ name_to_bookmark(char *buf, zbookmark_phys_t *zb) zb->zb_blkid = zfs_strtonum(buf + 1, &buf); ASSERT(*buf == '\0'); } + +#ifdef _KERNEL +static void +zep_to_zb(uint64_t dataset, zbookmark_err_phys_t *zep, zbookmark_phys_t *zb) +{ + zb->zb_objset = dataset; + zb->zb_object = zep->zb_object; + zb->zb_level = zep->zb_level; + zb->zb_blkid = zep->zb_blkid; +} #endif +static void +name_to_object(char *buf, uint64_t *obj) +{ + *obj = zfs_strtonum(buf, &buf); + ASSERT(*buf == '\0'); +} + +static int +get_head_and_birth_txg(spa_t *spa, zbookmark_err_phys_t *zep, uint64_t ds_obj, + uint64_t *head_dataset_id) +{ + dsl_pool_t *dp = spa->spa_dsl_pool; + dsl_dataset_t *ds; + objset_t *os; + + dsl_pool_config_enter(dp, FTAG); + int error = dsl_dataset_hold_obj(dp, ds_obj, FTAG, &ds); + if (error != 0) { + dsl_pool_config_exit(dp, FTAG); + return (error); + } + ASSERT(head_dataset_id); + *head_dataset_id = dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj; + + error = dmu_objset_from_ds(ds, &os); + if (error != 0) { + dsl_dataset_rele(ds, FTAG); + dsl_pool_config_exit(dp, FTAG); + return (error); + } + + dnode_t *dn; + blkptr_t bp; + + error = dnode_hold(os, zep->zb_object, FTAG, &dn); + if (error != 0) { + dsl_dataset_rele(ds, FTAG); + dsl_pool_config_exit(dp, FTAG); + return (error); + } + + rw_enter(&dn->dn_struct_rwlock, RW_READER); + error = dbuf_dnode_findbp(dn, zep->zb_level, zep->zb_blkid, &bp, NULL, + NULL); + + if (error == 0 && BP_IS_HOLE(&bp)) + error = SET_ERROR(ENOENT); + + zep->zb_birth = bp.blk_birth; + rw_exit(&dn->dn_struct_rwlock); + dnode_rele(dn, FTAG); + dsl_dataset_rele(ds, FTAG); + dsl_pool_config_exit(dp, FTAG); + return (error); +} + /* * 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 @@ -128,6 +241,276 @@ spa_log_error(spa_t *spa, const zbookmark_phys_t *zb) mutex_exit(&spa->spa_errlist_lock); } +#ifdef _KERNEL +static int +find_birth_txg(dsl_dataset_t *ds, zbookmark_err_phys_t *zep, + uint64_t *birth_txg) +{ + objset_t *os; + int error = dmu_objset_from_ds(ds, &os); + if (error != 0) + return (error); + + dnode_t *dn; + blkptr_t bp; + + error = dnode_hold(os, zep->zb_object, FTAG, &dn); + if (error != 0) + return (error); + + rw_enter(&dn->dn_struct_rwlock, RW_READER); + error = dbuf_dnode_findbp(dn, zep->zb_level, zep->zb_blkid, &bp, NULL, + NULL); + + if (error == 0 && BP_IS_HOLE(&bp)) + error = SET_ERROR(ENOENT); + + *birth_txg = bp.blk_birth; + rw_exit(&dn->dn_struct_rwlock); + dnode_rele(dn, FTAG); + return (error); +} + +/* + * This function serves a double role. If only_count is true, it returns + * (in *count) how many times an error block belonging to this filesystem is + * referenced by snapshots or clones. If only_count is false, each time the + * error block is referenced by a snapshot or clone, it fills the userspace + * array at uaddr with the bookmarks of the error blocks. The array is filled + * from the back and *count is modified to be the number of unused entries at + * the beginning of the array. + */ +static int +check_filesystem(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep, + uint64_t *count, void *uaddr, boolean_t only_count) +{ + dsl_dataset_t *ds; + dsl_pool_t *dp = spa->spa_dsl_pool; + + int error = dsl_dataset_hold_obj(dp, head_ds, FTAG, &ds); + if (error != 0) + return (error); + + uint64_t latest_txg; + uint64_t txg_to_consider = spa->spa_syncing_txg; + boolean_t check_snapshot = B_TRUE; + error = find_birth_txg(ds, zep, &latest_txg); + if (error == 0) { + if (zep->zb_birth == latest_txg) { + /* Block neither free nor rewritten. */ + if (!only_count) { + zbookmark_phys_t zb; + zep_to_zb(head_ds, zep, &zb); + if (copyout(&zb, (char *)uaddr + (*count - 1) + * sizeof (zbookmark_phys_t), + sizeof (zbookmark_phys_t)) != 0) { + dsl_dataset_rele(ds, FTAG); + return (SET_ERROR(EFAULT)); + } + (*count)--; + } else { + (*count)++; + } + check_snapshot = B_FALSE; + } else { + ASSERT3U(zep->zb_birth, <, latest_txg); + txg_to_consider = latest_txg; + } + } + + /* How many snapshots reference this block. */ + uint64_t snap_count; + error = zap_count(spa->spa_meta_objset, + dsl_dataset_phys(ds)->ds_snapnames_zapobj, &snap_count); + if (error != 0) { + dsl_dataset_rele(ds, FTAG); + return (error); + } + + if (snap_count == 0) { + /* File system has no snapshot. */ + dsl_dataset_rele(ds, FTAG); + return (0); + } + + uint64_t *snap_obj_array = kmem_alloc(snap_count * sizeof (uint64_t), + KM_SLEEP); + + int aff_snap_count = 0; + uint64_t snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; + uint64_t snap_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; + + /* Check only snapshots created from this file system. */ + while (snap_obj != 0 && zep->zb_birth < snap_obj_txg && + snap_obj_txg <= txg_to_consider) { + + dsl_dataset_rele(ds, FTAG); + error = dsl_dataset_hold_obj(dp, snap_obj, FTAG, &ds); + if (error != 0) + goto out; + + if (dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj != head_ds) + break; + + boolean_t affected = B_TRUE; + if (check_snapshot) { + uint64_t blk_txg; + error = find_birth_txg(ds, zep, &blk_txg); + affected = (error == 0 && zep->zb_birth == blk_txg); + } + + if (affected) { + snap_obj_array[aff_snap_count] = snap_obj; + aff_snap_count++; + + if (!only_count) { + zbookmark_phys_t zb; + zep_to_zb(snap_obj, zep, &zb); + if (copyout(&zb, (char *)uaddr + (*count - 1) * + sizeof (zbookmark_phys_t), + sizeof (zbookmark_phys_t)) != 0) { + dsl_dataset_rele(ds, FTAG); + error = SET_ERROR(EFAULT); + goto out; + } + (*count)--; + } else { + (*count)++; + } + + /* + * Only clones whose origins were affected could also + * have affected snapshots. + */ + zap_cursor_t zc; + zap_attribute_t za; + for (zap_cursor_init(&zc, spa->spa_meta_objset, + dsl_dataset_phys(ds)->ds_next_clones_obj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + error = check_filesystem(spa, + za.za_first_integer, zep, + count, uaddr, only_count); + + if (error != 0) { + zap_cursor_fini(&zc); + goto out; + } + } + zap_cursor_fini(&zc); + } + snap_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; + snap_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; + } + dsl_dataset_rele(ds, FTAG); + +out: + kmem_free(snap_obj_array, sizeof (*snap_obj_array)); + return (error); +} + +static int +find_top_affected_fs(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep, + uint64_t *top_affected_fs) +{ + uint64_t oldest_dsobj; + int error = dsl_dataset_oldest_snapshot(spa, head_ds, zep->zb_birth, + &oldest_dsobj); + if (error != 0) + return (error); + + dsl_dataset_t *ds; + error = dsl_dataset_hold_obj(spa->spa_dsl_pool, oldest_dsobj, + FTAG, &ds); + if (error != 0) + return (error); + + *top_affected_fs = + dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj; + dsl_dataset_rele(ds, FTAG); + return (0); +} + +static int +process_error_block(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep, + uint64_t *count, void *uaddr, boolean_t only_count) +{ + dsl_pool_t *dp = spa->spa_dsl_pool; + dsl_pool_config_enter(dp, FTAG); + uint64_t top_affected_fs; + + int error = find_top_affected_fs(spa, head_ds, zep, &top_affected_fs); + if (error == 0) + error = check_filesystem(spa, top_affected_fs, zep, count, + uaddr, only_count); + + dsl_pool_config_exit(dp, FTAG); + return (error); +} + +static uint64_t +get_errlog_size(spa_t *spa, uint64_t spa_err_obj) +{ + if (spa_err_obj == 0) + return (0); + uint64_t total = 0; + + zap_cursor_t zc; + zap_attribute_t za; + for (zap_cursor_init(&zc, spa->spa_meta_objset, spa_err_obj); + zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { + + zap_cursor_t head_ds_cursor; + zap_attribute_t head_ds_attr; + zbookmark_err_phys_t head_ds_block; + + uint64_t head_ds; + name_to_object(za.za_name, &head_ds); + + for (zap_cursor_init(&head_ds_cursor, spa->spa_meta_objset, + za.za_first_integer); zap_cursor_retrieve(&head_ds_cursor, + &head_ds_attr) == 0; zap_cursor_advance(&head_ds_cursor)) { + + name_to_errphys(head_ds_attr.za_name, &head_ds_block); + (void) process_error_block(spa, head_ds, &head_ds_block, + &total, NULL, B_TRUE); + } + zap_cursor_fini(&head_ds_cursor); + } + zap_cursor_fini(&zc); + return (total); +} + +static uint64_t +get_errlist_size(spa_t *spa, avl_tree_t *tree) +{ + if (avl_numnodes(tree) == 0) + return (0); + uint64_t total = 0; + + spa_error_entry_t *se; + for (se = avl_first(tree); se != NULL; se = AVL_NEXT(tree, se)) { + zbookmark_err_phys_t zep; + zep.zb_object = se->se_bookmark.zb_object; + zep.zb_level = se->se_bookmark.zb_level; + zep.zb_blkid = se->se_bookmark.zb_blkid; + + /* + * If we cannot find out the head dataset and birth txg of + * the present error block, we opt not to error out. In the + * next pool sync this information will be retrieved by + * sync_error_list() and written to the on-disk error log. + */ + uint64_t head_ds_obj; + if (get_head_and_birth_txg(spa, &zep, + se->se_bookmark.zb_objset, &head_ds_obj) == 0) + (void) process_error_block(spa, head_ds_obj, &zep, + &total, NULL, B_TRUE); + } + return (total); +} +#endif + /* * 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 @@ -136,83 +519,284 @@ spa_log_error(spa_t *spa, const zbookmark_phys_t *zb) uint64_t spa_get_errlog_size(spa_t *spa) { - uint64_t total = 0, count; + uint64_t total = 0; + + if (!spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) { + mutex_enter(&spa->spa_errlog_lock); + uint64_t count; + 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); + } else { +#ifdef _KERNEL + mutex_enter(&spa->spa_errlog_lock); + total += get_errlog_size(spa, spa->spa_errlog_last); + total += get_errlog_size(spa, spa->spa_errlog_scrub); + mutex_exit(&spa->spa_errlog_lock); + + mutex_enter(&spa->spa_errlist_lock); + total += get_errlist_size(spa, &spa->spa_errlist_last); + total += get_errlist_size(spa, &spa->spa_errlist_scrub); + mutex_exit(&spa->spa_errlist_lock); +#endif + } + return (total); +} - 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); +/* + * This function sweeps through an on-disk error log and stores all bookmarks + * as error bookmarks in a new ZAP object. At the end we discard the old one, + * and spa_update_errlog() will set the spa's on-disk error log to new ZAP + * object. + */ +static void +sync_upgrade_errlog(spa_t *spa, uint64_t spa_err_obj, uint64_t *newobj, + dmu_tx_t *tx) +{ + zap_cursor_t zc; + zap_attribute_t za; + zbookmark_phys_t zb; + uint64_t count; - 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); + *newobj = zap_create(spa->spa_meta_objset, DMU_OT_ERROR_LOG, + DMU_OT_NONE, 0, tx); - return (total); + /* + * If we cannnot perform the upgrade we should clear the old on-disk + * error logs. + */ + if (zap_count(spa->spa_meta_objset, spa_err_obj, &count) != 0) { + VERIFY0(dmu_object_free(spa->spa_meta_objset, spa_err_obj, tx)); + return; + } + + for (zap_cursor_init(&zc, spa->spa_meta_objset, spa_err_obj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + if (spa_upgrade_errlog_limit != 0 && + zc.zc_cd == spa_upgrade_errlog_limit) + break; + + name_to_bookmark(za.za_name, &zb); + + zbookmark_err_phys_t zep; + zep.zb_object = zb.zb_object; + zep.zb_level = zb.zb_level; + zep.zb_blkid = zb.zb_blkid; + + /* + * We cannot use get_head_and_birth_txg() because it will + * acquire the pool config lock, which we already have. In case + * of an error we simply continue. + */ + uint64_t head_dataset_obj; + dsl_pool_t *dp = spa->spa_dsl_pool; + dsl_dataset_t *ds; + objset_t *os; + + int error = dsl_dataset_hold_obj(dp, zb.zb_objset, FTAG, &ds); + if (error != 0) + continue; + + head_dataset_obj = + dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj; + + /* + * The objset and the dnode are required for getting the block + * pointer, which is used to determine if BP_IS_HOLE(). If + * getting the objset or the dnode fails, do not create a + * zap entry (presuming we know the dataset) as this may create + * spurious errors that we cannot ever resolve. If an error is + * truly persistent, it should re-appear after a scan. + */ + if (dmu_objset_from_ds(ds, &os) != 0) { + dsl_dataset_rele(ds, FTAG); + continue; + } + + dnode_t *dn; + blkptr_t bp; + + if (dnode_hold(os, zep.zb_object, FTAG, &dn) != 0) { + dsl_dataset_rele(ds, FTAG); + continue; + } + + rw_enter(&dn->dn_struct_rwlock, RW_READER); + error = dbuf_dnode_findbp(dn, zep.zb_level, zep.zb_blkid, &bp, + NULL, NULL); + + zep.zb_birth = bp.blk_birth; + rw_exit(&dn->dn_struct_rwlock); + dnode_rele(dn, FTAG); + dsl_dataset_rele(ds, FTAG); + + if (error != 0 || BP_IS_HOLE(&bp)) + continue; + + uint64_t err_obj; + error = zap_lookup_int_key(spa->spa_meta_objset, *newobj, + head_dataset_obj, &err_obj); + + if (error == ENOENT) { + err_obj = zap_create(spa->spa_meta_objset, + DMU_OT_ERROR_LOG, DMU_OT_NONE, 0, tx); + + (void) zap_update_int_key(spa->spa_meta_objset, + *newobj, head_dataset_obj, err_obj, tx); + } + + char buf[64]; + char *name = ""; + errphys_to_name(&zep, buf, sizeof (buf)); + + (void) zap_update(spa->spa_meta_objset, err_obj, + buf, 1, strlen(name) + 1, name, tx); + } + zap_cursor_fini(&zc); + + VERIFY0(dmu_object_free(spa->spa_meta_objset, spa_err_obj, tx)); +} + +void +spa_upgrade_errlog(spa_t *spa, dmu_tx_t *tx) +{ + uint64_t newobj = 0; + + mutex_enter(&spa->spa_errlog_lock); + if (spa->spa_errlog_last != 0) { + sync_upgrade_errlog(spa, spa->spa_errlog_last, &newobj, tx); + spa->spa_errlog_last = newobj; + } + + if (spa->spa_errlog_scrub != 0) { + sync_upgrade_errlog(spa, spa->spa_errlog_scrub, &newobj, tx); + spa->spa_errlog_scrub = newobj; + } + mutex_exit(&spa->spa_errlog_lock); } #ifdef _KERNEL +/* + * If an error block is shared by two datasets it will be counted twice. For + * detailed message see spa_get_errlog_size() above. + */ static int -process_error_log(spa_t *spa, uint64_t obj, void *addr, size_t *count) +process_error_log(spa_t *spa, uint64_t obj, void *uaddr, uint64_t *count) { zap_cursor_t zc; zap_attribute_t za; - zbookmark_phys_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 (!spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) { + 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 (SET_ERROR(ENOMEM)); + } + + zbookmark_phys_t zb; + name_to_bookmark(za.za_name, &zb); + + if (copyout(&zb, (char *)uaddr + + (*count - 1) * sizeof (zbookmark_phys_t), + sizeof (zbookmark_phys_t)) != 0) { + zap_cursor_fini(&zc); + return (SET_ERROR(EFAULT)); + } + *count -= 1; - if (*count == 0) { - zap_cursor_fini(&zc); - return (SET_ERROR(ENOMEM)); } + zap_cursor_fini(&zc); + return (0); + } - name_to_bookmark(za.za_name, &zb); + for (zap_cursor_init(&zc, spa->spa_meta_objset, obj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { - if (copyout(&zb, (char *)addr + - (*count - 1) * sizeof (zbookmark_phys_t), - sizeof (zbookmark_phys_t)) != 0) { - zap_cursor_fini(&zc); - return (SET_ERROR(EFAULT)); + zap_cursor_t head_ds_cursor; + zap_attribute_t head_ds_attr; + + uint64_t head_ds_err_obj = za.za_first_integer; + uint64_t head_ds; + name_to_object(za.za_name, &head_ds); + for (zap_cursor_init(&head_ds_cursor, spa->spa_meta_objset, + head_ds_err_obj); zap_cursor_retrieve(&head_ds_cursor, + &head_ds_attr) == 0; zap_cursor_advance(&head_ds_cursor)) { + + zbookmark_err_phys_t head_ds_block; + name_to_errphys(head_ds_attr.za_name, &head_ds_block); + int error = process_error_block(spa, head_ds, + &head_ds_block, count, uaddr, B_FALSE); + + if (error != 0) { + zap_cursor_fini(&head_ds_cursor); + zap_cursor_fini(&zc); + return (error); + } } - - *count -= 1; + zap_cursor_fini(&head_ds_cursor); } - zap_cursor_fini(&zc); - return (0); } static int -process_error_list(avl_tree_t *list, void *addr, size_t *count) +process_error_list(spa_t *spa, avl_tree_t *list, void *uaddr, uint64_t *count) { spa_error_entry_t *se; - for (se = avl_first(list); se != NULL; se = AVL_NEXT(list, se)) { + if (!spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) { + for (se = avl_first(list); se != NULL; + se = AVL_NEXT(list, se)) { - if (*count == 0) - return (SET_ERROR(ENOMEM)); + if (*count == 0) + return (SET_ERROR(ENOMEM)); - if (copyout(&se->se_bookmark, (char *)addr + - (*count - 1) * sizeof (zbookmark_phys_t), - sizeof (zbookmark_phys_t)) != 0) - return (SET_ERROR(EFAULT)); + if (copyout(&se->se_bookmark, (char *)uaddr + + (*count - 1) * sizeof (zbookmark_phys_t), + sizeof (zbookmark_phys_t)) != 0) + return (SET_ERROR(EFAULT)); - *count -= 1; + *count -= 1; + } + return (0); } + for (se = avl_first(list); se != NULL; se = AVL_NEXT(list, se)) { + zbookmark_err_phys_t zep; + zep.zb_object = se->se_bookmark.zb_object; + zep.zb_level = se->se_bookmark.zb_level; + zep.zb_blkid = se->se_bookmark.zb_blkid; + + uint64_t head_ds_obj; + int error = get_head_and_birth_txg(spa, &zep, + se->se_bookmark.zb_objset, &head_ds_obj); + if (error != 0) + return (error); + + error = process_error_block(spa, head_ds_obj, &zep, count, + uaddr, B_FALSE); + if (error != 0) + return (error); + } return (0); } #endif @@ -229,7 +813,7 @@ process_error_list(avl_tree_t *list, void *addr, size_t *count) * the error list lock when we are finished. */ int -spa_get_errlog(spa_t *spa, void *uaddr, size_t *count) +spa_get_errlog(spa_t *spa, void *uaddr, uint64_t *count) { int ret = 0; @@ -244,10 +828,10 @@ spa_get_errlog(spa_t *spa, void *uaddr, size_t *count) mutex_enter(&spa->spa_errlist_lock); if (!ret) - ret = process_error_list(&spa->spa_errlist_scrub, uaddr, + ret = process_error_list(spa, &spa->spa_errlist_scrub, uaddr, count); if (!ret) - ret = process_error_list(&spa->spa_errlist_last, uaddr, + ret = process_error_list(spa, &spa->spa_errlist_last, uaddr, count); mutex_exit(&spa->spa_errlist_lock); @@ -299,35 +883,91 @@ spa_errlog_drain(spa_t *spa) /* * Process a list of errors into the current on-disk log. */ -static void +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); + if (avl_numnodes(t) == 0) + return; + + /* 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 */ + /* add errors to the current log */ + if (!spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) { 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); + } + } else { + for (se = avl_first(t); se != NULL; se = AVL_NEXT(t, se)) { + char *name = se->se_name ? se->se_name : ""; + + zbookmark_err_phys_t zep; + zep.zb_object = se->se_bookmark.zb_object; + zep.zb_level = se->se_bookmark.zb_level; + zep.zb_blkid = se->se_bookmark.zb_blkid; + + /* + * If we cannot find out the head dataset and birth txg + * of the present error block, we simply continue. + * Reinserting that error block to the error lists, + * even if we are not syncing the final txg, results + * in duplicate posting of errors. + */ + uint64_t head_dataset_obj; + int error = get_head_and_birth_txg(spa, &zep, + se->se_bookmark.zb_objset, &head_dataset_obj); + if (error != 0) + continue; + + uint64_t err_obj; + error = zap_lookup_int_key(spa->spa_meta_objset, + *obj, head_dataset_obj, &err_obj); + + if (error == ENOENT) { + err_obj = zap_create(spa->spa_meta_objset, + DMU_OT_ERROR_LOG, DMU_OT_NONE, 0, tx); + + (void) zap_update_int_key(spa->spa_meta_objset, + *obj, head_dataset_obj, err_obj, tx); + } + errphys_to_name(&zep, buf, sizeof (buf)); + (void) zap_update(spa->spa_meta_objset, - *obj, buf, 1, strlen(name) + 1, name, tx); + err_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)); +} - /* purge the error list */ - cookie = NULL; - while ((se = avl_destroy_nodes(t, &cookie)) != NULL) - kmem_free(se, sizeof (spa_error_entry_t)); +static void +delete_errlog(spa_t *spa, uint64_t spa_err_obj, dmu_tx_t *tx) +{ + if (spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) { + zap_cursor_t zc; + zap_attribute_t za; + for (zap_cursor_init(&zc, spa->spa_meta_objset, spa_err_obj); + zap_cursor_retrieve(&zc, &za) == 0; + zap_cursor_advance(&zc)) { + VERIFY0(dmu_object_free(spa->spa_meta_objset, + za.za_first_integer, tx)); + } + zap_cursor_fini(&zc); } + VERIFY0(dmu_object_free(spa->spa_meta_objset, spa_err_obj, tx)); } /* @@ -378,8 +1018,7 @@ spa_errlog_sync(spa_t *spa, uint64_t txg) */ if (scrub_finished) { if (spa->spa_errlog_last != 0) - VERIFY(dmu_object_free(spa->spa_meta_objset, - spa->spa_errlog_last, tx) == 0); + delete_errlog(spa, spa->spa_errlog_last, tx); spa->spa_errlog_last = spa->spa_errlog_scrub; spa->spa_errlog_scrub = 0; @@ -406,6 +1045,137 @@ spa_errlog_sync(spa_t *spa, uint64_t txg) mutex_exit(&spa->spa_errlog_lock); } +static void +delete_dataset_errlog(spa_t *spa, uint64_t spa_err_obj, uint64_t ds, + dmu_tx_t *tx) +{ + if (spa_err_obj == 0) + return; + + zap_cursor_t zc; + zap_attribute_t za; + for (zap_cursor_init(&zc, spa->spa_meta_objset, spa_err_obj); + zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { + uint64_t head_ds; + name_to_object(za.za_name, &head_ds); + if (head_ds == ds) { + (void) zap_remove(spa->spa_meta_objset, spa_err_obj, + za.za_name, tx); + VERIFY0(dmu_object_free(spa->spa_meta_objset, + za.za_first_integer, tx)); + break; + } + } + zap_cursor_fini(&zc); +} + +void +spa_delete_dataset_errlog(spa_t *spa, uint64_t ds, dmu_tx_t *tx) +{ + mutex_enter(&spa->spa_errlog_lock); + delete_dataset_errlog(spa, spa->spa_errlog_scrub, ds, tx); + delete_dataset_errlog(spa, spa->spa_errlog_last, ds, tx); + mutex_exit(&spa->spa_errlog_lock); +} + +static int +find_txg_ancestor_snapshot(spa_t *spa, uint64_t new_head, uint64_t old_head, + uint64_t *txg) +{ + dsl_dataset_t *ds; + dsl_pool_t *dp = spa->spa_dsl_pool; + + int error = dsl_dataset_hold_obj(dp, old_head, FTAG, &ds); + if (error != 0) + return (error); + + uint64_t prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; + uint64_t prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; + + while (prev_obj != 0) { + dsl_dataset_rele(ds, FTAG); + if ((error = dsl_dataset_hold_obj(dp, prev_obj, + FTAG, &ds)) == 0 && + dsl_dir_phys(ds->ds_dir)->dd_head_dataset_obj == new_head) + break; + + if (error != 0) + return (error); + + prev_obj_txg = dsl_dataset_phys(ds)->ds_prev_snap_txg; + prev_obj = dsl_dataset_phys(ds)->ds_prev_snap_obj; + } + dsl_dataset_rele(ds, FTAG); + ASSERT(prev_obj != 0); + *txg = prev_obj_txg; + return (0); +} + +static void +swap_errlog(spa_t *spa, uint64_t spa_err_obj, uint64_t new_head, uint64_t + old_head, dmu_tx_t *tx) +{ + if (spa_err_obj == 0) + return; + + uint64_t old_head_errlog; + int error = zap_lookup_int_key(spa->spa_meta_objset, spa_err_obj, + old_head, &old_head_errlog); + + /* If no error log, then there is nothing to do. */ + if (error != 0) + return; + + uint64_t txg; + error = find_txg_ancestor_snapshot(spa, new_head, old_head, &txg); + if (error != 0) + return; + + /* + * Create an error log if the file system being promoted does not + * already have one. + */ + uint64_t new_head_errlog; + error = zap_lookup_int_key(spa->spa_meta_objset, spa_err_obj, new_head, + &new_head_errlog); + + if (error != 0) { + new_head_errlog = zap_create(spa->spa_meta_objset, + DMU_OT_ERROR_LOG, DMU_OT_NONE, 0, tx); + + (void) zap_update_int_key(spa->spa_meta_objset, spa_err_obj, + new_head, new_head_errlog, tx); + } + + zap_cursor_t zc; + zap_attribute_t za; + zbookmark_err_phys_t err_block; + for (zap_cursor_init(&zc, spa->spa_meta_objset, old_head_errlog); + zap_cursor_retrieve(&zc, &za) == 0; zap_cursor_advance(&zc)) { + + char *name = ""; + name_to_errphys(za.za_name, &err_block); + if (err_block.zb_birth < txg) { + (void) zap_update(spa->spa_meta_objset, new_head_errlog, + za.za_name, 1, strlen(name) + 1, name, tx); + + (void) zap_remove(spa->spa_meta_objset, old_head_errlog, + za.za_name, tx); + } + } + zap_cursor_fini(&zc); +} + +void +spa_swap_errlog(spa_t *spa, uint64_t new_head_ds, uint64_t old_head_ds, + dmu_tx_t *tx) +{ + mutex_enter(&spa->spa_errlog_lock); + swap_errlog(spa, spa->spa_errlog_scrub, new_head_ds, old_head_ds, tx); + swap_errlog(spa, spa->spa_errlog_last, new_head_ds, old_head_ds, tx); + mutex_exit(&spa->spa_errlog_lock); +} + #if defined(_KERNEL) /* error handling */ EXPORT_SYMBOL(spa_log_error); @@ -415,4 +1185,14 @@ EXPORT_SYMBOL(spa_errlog_rotate); EXPORT_SYMBOL(spa_errlog_drain); EXPORT_SYMBOL(spa_errlog_sync); EXPORT_SYMBOL(spa_get_errlists); +EXPORT_SYMBOL(spa_delete_dataset_errlog); +EXPORT_SYMBOL(spa_swap_errlog); +EXPORT_SYMBOL(sync_error_list); +EXPORT_SYMBOL(spa_upgrade_errlog); #endif + +/* BEGIN CSTYLED */ +ZFS_MODULE_PARAM(zfs_spa, spa_, upgrade_errlog_limit, INT, ZMOD_RW, + "Limit the number of errors which will be upgraded to the new " + "on-disk error log when enabling head_errlog"); +/* END CSTYLED */ |