Use udev to create /dev/zvol/[dataset_name] links

This commit allows zvols with names longer than 32 characters, which
fixes issue on https://github.com/behlendorf/zfs/issues/#issue/102.

Changes include:
- use /dev/zd* device names for zvol, where * is the device minor
  (include/sys/fs/zfs.h, module/zfs/zvol.c).
- add BLKZNAME ioctl to get dataset name from userland
  (include/sys/fs/zfs.h, module/zfs/zvol.c, cmd/zvol_id).
- add udev rule to create /dev/zvol/[dataset_name] and the legacy
  /dev/[dataset_name] symlink. For partitions on zvol, it will create
  /dev/zvol/[dataset_name]-part* (etc/udev/rules.d/60-zvol.rules,
  cmd/zvol_id).

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Fajar A. Nugraha 2011-02-22 17:58:44 +07:00 committed by Brian Behlendorf
parent 61da501f9d
commit 4c0d8e50b9
10 changed files with 761 additions and 9 deletions

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@ -1 +1 @@
SUBDIRS = zfs zpool zpool_id zpool_layout zdb zinject ztest zpios SUBDIRS = zfs zpool zpool_id zpool_layout zdb zinject ztest zpios zvol_id

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@ -292,7 +292,7 @@ target_vendor = @target_vendor@
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SUBDIRS = zfs zpool zpool_id zpool_layout zdb zinject ztest zpios SUBDIRS = zfs zpool zpool_id zpool_layout zdb zinject ztest zpios zvol_id
all: all-recursive all: all-recursive
.SUFFIXES: .SUFFIXES:

10
cmd/zvol_id/Makefile.am Normal file
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@ -0,0 +1,10 @@
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634
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@AMDEP_TRUE@@am__fastdepCC_FALSE@ DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
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mostlyclean-libtool:
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clean-libtool:
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END { if (nonempty) { for (i in files) print i; }; }'`; \
mkid -fID $$unique
tags: TAGS
TAGS: $(HEADERS) $(SOURCES) $(TAGS_DEPENDENCIES) \
$(TAGS_FILES) $(LISP)
set x; \
here=`pwd`; \
list='$(SOURCES) $(HEADERS) $(LISP) $(TAGS_FILES)'; \
unique=`for i in $$list; do \
if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
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END { if (nonempty) { for (i in files) print i; }; }'`; \
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# Tell versions [3.59,3.63) of GNU make to not export all variables.
# Otherwise a system limit (for SysV at least) may be exceeded.
.NOEXPORT:

View File

@ -0,0 +1,90 @@
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright (c) 2011, Fajar A. Nugraha. All rights reserved.
* Use is subject to license terms.
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <linux/ioctl.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/zfs_znode.h>
#include <sys/fs/zfs.h>
int ioctl_get_msg(char *var, int fd)
{
int error = 0;
char msg[ZFS_MAXNAMELEN];
error = ioctl(fd, BLKZNAME, msg);
if (error < 0) {
printf("ioctl_get_msg failed:%d\n", error);
return (error);
}
snprintf(var, ZFS_MAXNAMELEN, "%s", msg);
return (error);
}
int main(int argc, char **argv)
{
int fd, error = 0;
char zvol_name[ZFS_MAXNAMELEN], zvol_name_part[ZFS_MAXNAMELEN];
char *dev_name;
struct stat64 statbuf;
int dev_minor, dev_part;
if (argc < 2) {
printf("Usage: %s /dev/zvol_device_node\n", argv[0]);
return (EINVAL);
}
dev_name = argv[1];
error = stat64(dev_name, &statbuf);
if (error != 0) {
printf("Unable to access device file: %s\n", dev_name);
return (errno);
}
dev_minor = minor(statbuf.st_rdev);
dev_part = dev_minor % ZVOL_MINORS;
fd = open(dev_name, O_RDONLY);
if (fd < 0) {
printf("Unable to open device file: %s\n", dev_name);
return (errno);
}
ioctl_get_msg(zvol_name, fd);
if (dev_part > 0)
snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s-part%d", zvol_name,
dev_part);
else
snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s", zvol_name);
printf("%s\n", zvol_name_part);
close(fd);
return (error);
}

3
configure vendored
View File

@ -19739,7 +19739,7 @@ fi
$as_echo "$enable_debug" >&6; } $as_echo "$enable_debug" >&6; }
ac_config_files="$ac_config_files Makefile etc/Makefile man/Makefile man/man8/Makefile lib/Makefile lib/libspl/Makefile lib/libspl/asm-generic/Makefile lib/libspl/asm-i386/Makefile lib/libspl/asm-x86_64/Makefile lib/libspl/include/Makefile lib/libspl/include/ia32/Makefile lib/libspl/include/ia32/sys/Makefile lib/libspl/include/rpc/Makefile lib/libspl/include/sys/Makefile lib/libspl/include/sys/sysevent/Makefile lib/libspl/include/sys/dktp/Makefile lib/libspl/include/util/Makefile lib/libavl/Makefile lib/libefi/Makefile lib/libnvpair/Makefile lib/libunicode/Makefile lib/libuutil/Makefile lib/libzpool/Makefile lib/libzfs/Makefile cmd/Makefile cmd/zdb/Makefile cmd/zfs/Makefile cmd/zinject/Makefile cmd/zpool/Makefile cmd/zpool_id/Makefile cmd/zpool_layout/Makefile cmd/ztest/Makefile cmd/zpios/Makefile module/Makefile module/avl/Makefile module/nvpair/Makefile module/unicode/Makefile module/zcommon/Makefile module/zfs/Makefile module/zpios/Makefile include/Makefile include/linux/Makefile include/sys/Makefile include/sys/fs/Makefile include/sys/fm/Makefile include/sys/fm/fs/Makefile scripts/Makefile scripts/zpios-profile/Makefile scripts/zpios-test/Makefile scripts/zpool-config/Makefile scripts/zpool-layout/Makefile scripts/common.sh zfs.spec zfs-modules.spec zfs-script-config.sh" ac_config_files="$ac_config_files Makefile etc/Makefile man/Makefile man/man8/Makefile lib/Makefile lib/libspl/Makefile lib/libspl/asm-generic/Makefile lib/libspl/asm-i386/Makefile lib/libspl/asm-x86_64/Makefile lib/libspl/include/Makefile lib/libspl/include/ia32/Makefile lib/libspl/include/ia32/sys/Makefile lib/libspl/include/rpc/Makefile lib/libspl/include/sys/Makefile lib/libspl/include/sys/sysevent/Makefile lib/libspl/include/sys/dktp/Makefile lib/libspl/include/util/Makefile lib/libavl/Makefile lib/libefi/Makefile lib/libnvpair/Makefile lib/libunicode/Makefile lib/libuutil/Makefile lib/libzpool/Makefile lib/libzfs/Makefile cmd/Makefile cmd/zdb/Makefile cmd/zfs/Makefile cmd/zinject/Makefile cmd/zpool/Makefile cmd/zpool_id/Makefile cmd/zpool_layout/Makefile cmd/ztest/Makefile cmd/zpios/Makefile cmd/zvol_id/Makefile module/Makefile module/avl/Makefile module/nvpair/Makefile module/unicode/Makefile module/zcommon/Makefile module/zfs/Makefile module/zpios/Makefile include/Makefile include/linux/Makefile include/sys/Makefile include/sys/fs/Makefile include/sys/fm/Makefile include/sys/fm/fs/Makefile scripts/Makefile scripts/zpios-profile/Makefile scripts/zpios-test/Makefile scripts/zpool-config/Makefile scripts/zpool-layout/Makefile scripts/common.sh zfs.spec zfs-modules.spec zfs-script-config.sh"
cat >confcache <<\_ACEOF cat >confcache <<\_ACEOF
@ -20688,6 +20688,7 @@ do
"cmd/zpool_layout/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/zpool_layout/Makefile" ;; "cmd/zpool_layout/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/zpool_layout/Makefile" ;;
"cmd/ztest/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/ztest/Makefile" ;; "cmd/ztest/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/ztest/Makefile" ;;
"cmd/zpios/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/zpios/Makefile" ;; "cmd/zpios/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/zpios/Makefile" ;;
"cmd/zvol_id/Makefile") CONFIG_FILES="$CONFIG_FILES cmd/zvol_id/Makefile" ;;
"module/Makefile") CONFIG_FILES="$CONFIG_FILES module/Makefile" ;; "module/Makefile") CONFIG_FILES="$CONFIG_FILES module/Makefile" ;;
"module/avl/Makefile") CONFIG_FILES="$CONFIG_FILES module/avl/Makefile" ;; "module/avl/Makefile") CONFIG_FILES="$CONFIG_FILES module/avl/Makefile" ;;
"module/nvpair/Makefile") CONFIG_FILES="$CONFIG_FILES module/nvpair/Makefile" ;; "module/nvpair/Makefile") CONFIG_FILES="$CONFIG_FILES module/nvpair/Makefile" ;;

View File

@ -87,6 +87,7 @@ AC_CONFIG_FILES([
cmd/zpool_layout/Makefile cmd/zpool_layout/Makefile
cmd/ztest/Makefile cmd/ztest/Makefile
cmd/zpios/Makefile cmd/zpios/Makefile
cmd/zvol_id/Makefile
module/Makefile module/Makefile
module/avl/Makefile module/avl/Makefile
module/nvpair/Makefile module/nvpair/Makefile

View File

@ -0,0 +1,6 @@
# Peristent links for zvol
#
# persistent disk links: /dev/zvol/dataset_name
# also creates compatibilty symlink of /dev/dataset_name
KERNEL=="zd*" SUBSYSTEM=="block" ACTION=="add" PROGRAM="/usr/bin/zvol_id $tempnode" SYMLINK+="zvol/%c %c"

View File

@ -707,6 +707,7 @@ typedef struct ddt_histogram {
#define ZVOL_MINOR_BITS 4 #define ZVOL_MINOR_BITS 4
#define ZVOL_MINOR_MASK ((1U << ZVOL_MINOR_BITS) - 1) #define ZVOL_MINOR_MASK ((1U << ZVOL_MINOR_BITS) - 1)
#define ZVOL_MINORS (1 << 4) #define ZVOL_MINORS (1 << 4)
#define ZVOL_DEV_NAME "zd"
#define ZVOL_PROP_NAME "name" #define ZVOL_PROP_NAME "name"
#define ZVOL_DEFAULT_BLOCKSIZE 8192 #define ZVOL_DEFAULT_BLOCKSIZE 8192
@ -781,6 +782,11 @@ typedef enum zfs_ioc {
ZFS_IOC_EVENTS_CLEAR, ZFS_IOC_EVENTS_CLEAR,
} zfs_ioc_t; } zfs_ioc_t;
/*
* zvol ioctl to get dataset name
*/
#define BLKZNAME _IO(0x12,125)
/* /*
* Internal SPA load state. Used by FMA diagnosis engine. * Internal SPA load state. Used by FMA diagnosis engine.
*/ */

View File

@ -58,7 +58,7 @@ static char *zvol_tag = "zvol_tag";
* The in-core state of each volume. * The in-core state of each volume.
*/ */
typedef struct zvol_state { typedef struct zvol_state {
char zv_name[DISK_NAME_LEN]; /* name */ char zv_name[MAXNAMELEN]; /* name */
uint64_t zv_volsize; /* advertised space */ uint64_t zv_volsize; /* advertised space */
uint64_t zv_volblocksize;/* volume block size */ uint64_t zv_volblocksize;/* volume block size */
objset_t *zv_objset; /* objset handle */ objset_t *zv_objset; /* objset handle */
@ -132,7 +132,7 @@ zvol_find_by_name(const char *name)
ASSERT(MUTEX_HELD(&zvol_state_lock)); ASSERT(MUTEX_HELD(&zvol_state_lock));
for (zv = list_head(&zvol_state_list); zv != NULL; for (zv = list_head(&zvol_state_list); zv != NULL;
zv = list_next(&zvol_state_list, zv)) { zv = list_next(&zvol_state_list, zv)) {
if (!strncmp(zv->zv_name, name, DISK_NAME_LEN)) if (!strncmp(zv->zv_name, name, MAXNAMELEN))
return zv; return zv;
} }
@ -895,6 +895,9 @@ zvol_ioctl(struct block_device *bdev, fmode_t mode,
case BLKFLSBUF: case BLKFLSBUF:
zil_commit(zv->zv_zilog, ZVOL_OBJ); zil_commit(zv->zv_zilog, ZVOL_OBJ);
break; break;
case BLKZNAME:
error = copy_to_user((void *)arg, zv->zv_name, MAXNAMELEN);
break;
default: default:
error = -ENOTTY; error = -ENOTTY;
@ -1058,7 +1061,7 @@ zvol_alloc(dev_t dev, const char *name)
zv->zv_queue->queuedata = zv; zv->zv_queue->queuedata = zv;
zv->zv_dev = dev; zv->zv_dev = dev;
zv->zv_open_count = 0; zv->zv_open_count = 0;
strlcpy(zv->zv_name, name, DISK_NAME_LEN); strlcpy(zv->zv_name, name, MAXNAMELEN);
mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL);
avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare,
@ -1073,7 +1076,8 @@ zvol_alloc(dev_t dev, const char *name)
zv->zv_disk->fops = &zvol_ops; zv->zv_disk->fops = &zvol_ops;
zv->zv_disk->private_data = zv; zv->zv_disk->private_data = zv;
zv->zv_disk->queue = zv->zv_queue; zv->zv_disk->queue = zv->zv_queue;
snprintf(zv->zv_disk->disk_name, DISK_NAME_LEN, "%s", name); snprintf(zv->zv_disk->disk_name, DISK_NAME_LEN, "%s%d",
ZVOL_DEV_NAME, (dev & MINORMASK));
return zv; return zv;
@ -1274,7 +1278,7 @@ zvol_remove_minors(const char *pool)
zvol_state_t *zv, *zv_next; zvol_state_t *zv, *zv_next;
char *str; char *str;
str = kmem_zalloc(DISK_NAME_LEN, KM_SLEEP); str = kmem_zalloc(MAXNAMELEN, KM_SLEEP);
if (pool) { if (pool) {
(void) strncpy(str, pool, strlen(pool)); (void) strncpy(str, pool, strlen(pool));
(void) strcat(str, "/"); (void) strcat(str, "/");
@ -1290,7 +1294,7 @@ zvol_remove_minors(const char *pool)
} }
} }
mutex_exit(&zvol_state_lock); mutex_exit(&zvol_state_lock);
kmem_free(str, DISK_NAME_LEN); kmem_free(str, MAXNAMELEN);
} }
int int