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OpenZFS 7541 - zpool import/tryimport ioctl returns ENOMEM

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Authored by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>

The refresh_config() calls into the kernel with ZFS_IOC_POOL_TRYIMPORT.
This ioctl returns the config of the pool in a buffer pre-allocated in
userland. The original estimate for the size is too conservative since
it doesn't account for the large size of vdev stats that are added to
the config before returning.
This fix simply increases the size of the buffer passed. This results in
a speed up of the zpool import process, and less spam in zfs_dbgmsg.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Ported-by: George Melikov <mail@gmelikov.ru>

OpenZFS-issue: https://www.illumos.org/issues/7541
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/a3c7690
Closes #5704
This commit is contained in:
George Melikov 2017-01-31 00:20:55 +03:00 committed by Brian Behlendorf
parent 456079d48d
commit 28b40c8a6e
2 changed files with 7 additions and 4 deletions
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2
include/libzfs_impl.h
View File

@ -131,6 +131,8 @@ typedef enum {
SHARED_SMB = 0x4
} zfs_share_type_t;
#define CONFIG_BUF_MINSIZE 65536
int zfs_error(libzfs_handle_t *, int, const char *);
int zfs_error_fmt(libzfs_handle_t *, int, const char *, ...);
void zfs_error_aux(libzfs_handle_t *, const char *, ...);

9
lib/libzfs/libzfs_import.c
View File

@ -21,7 +21,7 @@
/*
* Copyright 2015 Nexenta Systems, Inc. All rights reserved.
* Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012 by Delphix. All rights reserved.
* Copyright (c) 2012, 2016 by Delphix. All rights reserved.
* Copyright 2015 RackTop Systems.
* Copyright (c) 2016, Intel Corporation.
*/
@ -823,13 +823,14 @@ refresh_config(libzfs_handle_t *hdl, nvlist_t *config)
{
nvlist_t *nvl;
zfs_cmd_t zc = {"\0"};
int err;
int err, dstbuf_size;
if (zcmd_write_conf_nvlist(hdl, &zc, config) != 0)
return (NULL);
if (zcmd_alloc_dst_nvlist(hdl, &zc,
zc.zc_nvlist_conf_size * 2) != 0) {
dstbuf_size = MAX(CONFIG_BUF_MINSIZE, zc.zc_nvlist_conf_size * 4);
if (zcmd_alloc_dst_nvlist(hdl, &zc, dstbuf_size) != 0) {
zcmd_free_nvlists(&zc);
return (NULL);
}