svn commit: r329766 - vendor-sys/illumos/dist/uts/common/fs/zfs vendor/illumos/dist/cmd/zdb

[Alexander Motin]

Author: mav
Date: Thu Feb 22 00:09:15 2018
New Revision: 329766
URL: https://svnweb.freebsd.org/changeset/base/329766

Log:
  8962 zdb should work on non-idle pools
  
  illumos/illumos-gate at e144c4e6c90e7d4dccaad6db660ee42b6e7ba04f
  
  Currently `zdb` consistently fails to examine non-idle pools as it fails
  during the `spa_load()` process. The main problem seems to be that
  `spa_load_verify()` fails as can be seen below:
  
  $ sudo zdb -d -G dcenter
      zdb: can't open 'dcenter': I/O error
  
  ZFS_DBGMSG(zdb):
      spa_open_common: opening dcenter
      spa_load(dcenter): LOADING
      disk vdev '/dev/dsk/c4t11d0s0': best uberblock found for spa dcenter. txg 40824950
      spa_load(dcenter): using uberblock with txg=40824950
      spa_load(dcenter): UNLOADING
      spa_load(dcenter): RELOADING
      spa_load(dcenter): LOADING
      disk vdev '/dev/dsk/c3t10d0s0': best uberblock found for spa dcenter. txg 40824952
      spa_load(dcenter): using uberblock with txg=40824952
      spa_load(dcenter): FAILED: spa_load_verify failed [error=5]
      spa_load(dcenter): UNLOADING
  
  This change makes `spa_load_verify()` a dryrun when ran from `zdb`. This is
  done by creating a global flag in zfs and then setting it in `zdb`.
  
  Reviewed by: George Wilson <george.wilson at delphix.com>
  Reviewed by: Matthew Ahrens <mahrens at delphix.com>
  Reviewed by: Andy Stormont <astormont at racktopsystems.com>
  Approved by: Dan McDonald <danmcd at joyent.com>
  Author: Pavel Zakharov <pavel.zakharov at delphix.com>

Modified:
  vendor-sys/illumos/dist/uts/common/fs/zfs/spa.c

Changes in other areas also in this revision:
Modified:
  vendor/illumos/dist/cmd/zdb/zdb.c

Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/spa.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/spa.c	Thu Feb 22 00:03:14 2018	(r329765)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/spa.c	Thu Feb 22 00:09:15 2018	(r329766)
@@ -165,6 +165,12 @@ boolean_t	spa_create_process = B_TRUE;	/* no process =
 extern int	zfs_sync_pass_deferred_free;
 
 /*
+ * Report any spa_load_verify errors found, but do not fail spa_load.
+ * This is used by zdb to analyze non-idle pools.
+ */
+boolean_t	spa_load_verify_dryrun = B_FALSE;
+
+/*
  * This (illegal) pool name is used when temporarily importing a spa_t in order
  * to get the vdev stats associated with the imported devices.
  */
@@ -2014,8 +2020,15 @@ spa_load_verify(spa_t *spa)
 	spa->spa_load_meta_errors = sle.sle_meta_count;
 	spa->spa_load_data_errors = sle.sle_data_count;
 
-	if (!error && sle.sle_meta_count <= policy.zrp_maxmeta &&
-	    sle.sle_data_count <= policy.zrp_maxdata) {
+	if (sle.sle_meta_count != 0 || sle.sle_data_count != 0) {
+		spa_load_note(spa, "spa_load_verify found %llu metadata errors "
+		    "and %llu data errors", (u_longlong_t)sle.sle_meta_count,
+		    (u_longlong_t)sle.sle_data_count);
+	}
+
+	if (spa_load_verify_dryrun ||
+	    (!error && sle.sle_meta_count <= policy.zrp_maxmeta &&
+	    sle.sle_data_count <= policy.zrp_maxdata)) {
 		int64_t loss = 0;
 
 		verify_ok = B_TRUE;
@@ -2032,6 +2045,9 @@ spa_load_verify(spa_t *spa)
 	} else {
 		spa->spa_load_max_txg = spa->spa_uberblock.ub_txg;
 	}
+
+	if (spa_load_verify_dryrun)
+		return (0);
 
 	if (error) {
 		if (error != ENXIO && error != EIO)