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Don't let LVM2 access a VG if the original LVM driver appears to be using it.

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This commit is contained in:
Alasdair Kergon 2002-11-01 19:57:25 +00:00
parent ca94915779
commit f2187638dc
2 changed files with 51 additions and 10 deletions
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41
lib/locking/locking.c
View File

@ -10,8 +10,12 @@
#include "locking_types.h"
#include "lvm-string.h"
#include "activate.h"
#include "toolcontext.h"
#include "defaults.h"
#include <signal.h>
#include <sys/stat.h>
#include <limits.h>
static struct locking_type _locking;
static sigset_t _oldset;
@ -97,6 +101,7 @@ int init_locking(int type, struct config_file *cf)
if (!ignorelockingfailure())
return 0;
/* FIXME Ensure only read ops are permitted */
log_verbose("Locking disabled - only read operations permitted.");
init_no_locking(&_locking, cf);
@ -109,6 +114,33 @@ void fin_locking(void)
_locking.fin_locking();
}
/*
* Does the LVM1 driver know of this VG name?
*/
int check_lvm1_vg_inactive(struct cmd_context *cmd, const char *vgname)
{
struct stat info;
char path[PATH_MAX];
if (lvm_snprintf(path, sizeof(path), "%s/lvm/VGs/%s",
find_config_str(cmd->cf->root, "global/proc", '/',
DEFAULT_PROC_DIR), vgname) < 0) {
log_error("LVM1 proc VG pathname too long for %s", vgname);
return 0;
}
if (stat(path, &info) == 0) {
log_error("%s exists: Is the original LVM driver using "
"this volume group?", path);
return 0;
} else if (errno != ENOENT && errno != ENOTDIR) {
log_sys_error("stat", path);
return 0;
}
return 1;
}
/*
* VG locking is by VG name.
* FIXME This should become VG uuid.
@ -133,8 +165,13 @@ int lock_vol(struct cmd_context *cmd, const char *vol, int flags)
char resource[258];
switch (flags & LCK_SCOPE_MASK) {
case LCK_VG: /* Lock VG to change on-disk metadata. */
case LCK_LV: /* Suspends LV if it's active. */
case LCK_VG:
/* Lock VG to change on-disk metadata. */
/* If LVM1 driver knows about the VG, it can't be accessed. */
if (!check_lvm1_vg_inactive(cmd, vol))
return 0;
case LCK_LV:
/* Suspend LV if it's active. */
strncpy(resource, (char *) vol, sizeof(resource));
break;
default:

20
lib/locking/locking.h
View File

@ -24,18 +24,23 @@ void fin_locking(void);
*/
int lock_vol(struct cmd_context *cmd, const char *vol, int flags);
/*
* Does the LVM1 driver have this VG active?
*/
int check_lvm1_vg_inactive(struct cmd_context *cmd, const char *vgname);
/*
* Lock type - these numbers are the same as VMS and the IBM DLM
*/
#define LCK_TYPE_MASK 0x000000FF
#define LCK_NULL 0x00000000 /* LCK$_NLMODE */
#define LCK_READ 0x00000001 /* LCK$_CRMODE */
/* LCK$_CWMODE */
/* LCK$_PRMODE */
#define LCK_WRITE 0x00000004 /* LCK$_PWMODE */
#define LCK_EXCL 0x00000005 /* LCK$_EXMODE */
#define LCK_UNLOCK 0x00000010 /* This is ours */
#define LCK_NULL 0x00000000 /* LCK$_NLMODE */
#define LCK_READ 0x00000001 /* LCK$_CRMODE */
/* LCK$_CWMODE */
/* LCK$_PRMODE */
#define LCK_WRITE 0x00000004 /* LCK$_PWMODE */
#define LCK_EXCL 0x00000005 /* LCK$_EXMODE */
#define LCK_UNLOCK 0x00000010 /* This is ours */
/*
* Lock scope
@ -64,4 +69,3 @@ int lock_vol(struct cmd_context *cmd, const char *vol, int flags);
#define unlock_lv(cmd, vol) lock_vol(cmd, vol, LCK_LV_UNLOCK)
#define unlock_vg(cmd, vol) lock_vol(cmd, vol, LCK_VG_UNLOCK)