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Implement -t option to zpool import for temporary pool names 

Originally, users had to handle spa namespace collisions by either
exporting the already imported pool or by specifying a new name for the
pool with a conflicting name. In the case of root pools from virtual
guests, neither approach to collision resolution is reasonable. This is
addressed by extending the new name syntax with a -t option to specify
that the new name is temporary. When specified, this sets an internal
flag that is passed into the kernel to tell it that all label updates
should refer to the name used in the original label. Consequently, the
original pool name will be retained on export.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2189
This commit is contained in:
Richard Yao 2013-07-01 10:57:04 -04:00 committed by Brian Behlendorf
parent 8959b29e31
commit 26b42f3f9d
4 changed files with 45 additions and 5 deletions
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6
cmd/zpool/zpool_main.c
View File

@ -2013,7 +2013,7 @@ zpool_do_import(int argc, char **argv)
char *endptr;
/* check options */
while ((c = getopt(argc, argv, ":aCc:d:DEfFmnNo:R:T:VX")) != -1) {
while ((c = getopt(argc, argv, ":aCc:d:DEfFmnNo:R:tT:VX")) != -1) {
switch (c) {
case 'a':
do_all = B_TRUE;
@ -2075,6 +2075,10 @@ zpool_do_import(int argc, char **argv)
ZPOOL_PROP_CACHEFILE), "none", &props, B_TRUE))
goto error;
break;
case 't':
flags |= ZFS_IMPORT_TEMP_NAME;
break;
case 'T':
errno = 0;
txg = strtoull(optarg, &endptr, 10);

1
include/sys/fs/zfs.h
View File

@ -936,6 +936,7 @@ typedef enum {
#define ZFS_IMPORT_ANY_HOST 0x2
#define ZFS_IMPORT_MISSING_LOG 0x4
#define ZFS_IMPORT_ONLY 0x8
#define ZFS_IMPORT_TEMP_NAME 0x10
/*
* Sysevent payload members. ZFS will generate the following sysevents with the

15
man/man8/zpool.8
View File

@ -84,7 +84,7 @@ zpool \- configures ZFS storage pools
.LP
.nf
\fBzpool import\fR [\fB-o \fImntopts\fR\fR] [\fB-o\fR \fIproperty=value\fR] ... [\fB-d\fR \fIdir\fR | \fB-c\fR \fIcachefile\fR]
[\fB-D\fR] [\fB-f\fR] [\fB-m\fR] [\fB-R\fR \fIroot\fR] [\fB-F\fR [\fB-n\fR]] \fIpool\fR |\fIid\fR [\fInewpool\fR]
[\fB-D\fR] [\fB-f\fR] [\fB-m\fR] [\fB-R\fR \fIroot\fR] [\fB-F\fR [\fB-n\fR]] [\fB-t\fR]] \fIpool\fR |\fIid\fR [\fInewpool\fR]
.fi
.LP
@ -1300,7 +1300,7 @@ Used with the \fB-F\fR recovery option. Determines whether a non-importable pool
.ne 2
.mk
.na
\fB\fBzpool import\fR [\fB-o\fR \fImntopts\fR] [ \fB-o\fR \fIproperty\fR=\fIvalue\fR] ... [\fB-d\fR \fIdir\fR | \fB-c\fR \fIcachefile\fR] [\fB-D\fR] [\fB-f\fR] [\fB-m\fR] [\fB-R\fR \fIroot\fR] [\fB-F\fR [\fB-n\fR]] \fIpool\fR | \fIid\fR [\fInewpool\fR]\fR
\fB\fBzpool import\fR [\fB-o\fR \fImntopts\fR] [ \fB-o\fR \fIproperty\fR=\fIvalue\fR] ... [\fB-d\fR \fIdir\fR | \fB-c\fR \fIcachefile\fR] [\fB-D\fR] [\fB-f\fR] [\fB-m\fR] [\fB-R\fR \fIroot\fR] [\fB-F\fR [\fB-n\fR]] [\fB-t\fR]] \fIpool\fR | \fIid\fR [\fInewpool\fR]\fR
.ad
.sp .6
.RS 4n
@ -1406,6 +1406,17 @@ Sets the "\fBcachefile\fR" property to "\fBnone\fR" and the "\fIaltroot\fR" prop
Used with the \fB-F\fR recovery option. Determines whether a non-importable pool can be made importable again, but does not actually perform the pool recovery. For more details about pool recovery mode, see the \fB-F\fR option, above.
.RE
.sp
.ne 2
.mk
.na
\fB\fB-t\fR\fR
.ad
.sp .6
.RS 4n
Used with "\fBnewpool\fR". Specifies that "\fBnewpool\fR" is temporary. Temporary pool names last until export. Ensures that the original pool name will be used in all label updates and therefore is retained upon export.
.RE
.sp
.ne 2
.mk

28
module/zfs/spa_config.c
View File

@ -208,6 +208,7 @@ spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
{
spa_config_dirent_t *dp, *tdp;
nvlist_t *nvl;
char *pool_name;
ASSERT(MUTEX_HELD(&spa_namespace_lock));
@ -254,7 +255,13 @@ spa_config_sync(spa_t *target, boolean_t removing, boolean_t postsysevent)
VERIFY(nvlist_alloc(&nvl, NV_UNIQUE_NAME,
KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_nvlist(nvl, spa->spa_name,
if (spa->spa_import_flags & ZFS_IMPORT_TEMP_NAME) {
VERIFY0(nvlist_lookup_string(spa->spa_config,
ZPOOL_CONFIG_POOL_NAME, &pool_name));
} else
pool_name = spa_name(spa);
VERIFY(nvlist_add_nvlist(nvl, pool_name,
spa->spa_config) == 0);
mutex_exit(&spa->spa_props_lock);
}
@ -337,6 +344,7 @@ spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, int getstats)
unsigned long hostid = 0;
boolean_t locked = B_FALSE;
uint64_t split_guid;
char *pool_name;
if (vd == NULL) {
vd = rvd;
@ -353,12 +361,28 @@ spa_config_generate(spa_t *spa, vdev_t *vd, uint64_t txg, int getstats)
if (txg == -1ULL)
txg = spa->spa_config_txg;
/*
* Originally, users had to handle spa namespace collisions by either
* exporting the already imported pool or by specifying a new name for
* the pool with a conflicting name. In the case of root pools from
* virtual guests, neither approach to collision resolution is
* reasonable. This is addressed by extending the new name syntax with
* an option to specify that the new name is temporary. When specified,
* ZFS_IMPORT_TEMP_NAME will be set in spa->spa_import_flags to tell us
* to use the previous name, which we do below.
*/
if (spa->spa_import_flags & ZFS_IMPORT_TEMP_NAME) {
VERIFY0(nvlist_lookup_string(spa->spa_config,
ZPOOL_CONFIG_POOL_NAME, &pool_name));
} else
pool_name = spa_name(spa);
VERIFY(nvlist_alloc(&config, NV_UNIQUE_NAME, KM_PUSHPAGE) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_VERSION,
spa_version(spa)) == 0);
VERIFY(nvlist_add_string(config, ZPOOL_CONFIG_POOL_NAME,
spa_name(spa)) == 0);
pool_name) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_STATE,
spa_state(spa)) == 0);
VERIFY(nvlist_add_uint64(config, ZPOOL_CONFIG_POOL_TXG,