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Race condition between spa async threads and export

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In the past we've seen multiple race conditions that have
to do with open-context threads async threads and concurrent
calls to spa_export()/spa_destroy() (including the one
referenced in issue #9015).

This patch ensures that only one thread can execute the
main body of spa_export_common() at a time, with subsequent
threads returning with a new error code created just for
this situation, eliminating this way any race condition
bugs introduced by concurrent calls to this function.

Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Closes #9015
Closes #9044
This commit is contained in:
Serapheim Dimitropoulos
2019-07-18 13:02:33 -07:00
committed by Tony Hutter
parent bbbe4b0a98
commit 1c4b0fc745
6 changed files with 42 additions and 2 deletions
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lib/libzfs/libzfs_util.c
+5
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@@ -303,6 +303,8 @@ libzfs_error_description(libzfs_handle_t *hdl)
case EZFS_NO_RESILVER_DEFER:
return (dgettext(TEXT_DOMAIN, "this action requires the "
"resilver_defer feature"));
case EZFS_EXPORT_IN_PROGRESS:
return (dgettext(TEXT_DOMAIN, "pool export in progress"));
case EZFS_UNKNOWN:
return (dgettext(TEXT_DOMAIN, "unknown error"));
default:
@@ -598,6 +600,9 @@ zpool_standard_error_fmt(libzfs_handle_t *hdl, int error, const char *fmt, ...)
case ZFS_ERR_VDEV_TOO_BIG:
zfs_verror(hdl, EZFS_VDEV_TOO_BIG, fmt, ap);
break;
case ZFS_ERR_EXPORT_IN_PROGRESS:
zfs_verror(hdl, EZFS_EXPORT_IN_PROGRESS, fmt, ap);
break;
case ZFS_ERR_IOC_CMD_UNAVAIL:
zfs_error_aux(hdl, dgettext(TEXT_DOMAIN, "the loaded zfs "
"module does not support this operation. A reboot may "