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Use name-based device refs if kernel doesn't support device number refs.

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Fix memory leak (struct dm_ioctl) when struct dm_task is reused.
This commit is contained in:
Alasdair Kergon 2006-04-03 15:56:02 +00:00
parent c01a800a6b
commit abed57cb53
2 changed files with 74 additions and 18 deletions
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2
WHATS_NEW_DM
View File

@ -1,5 +1,7 @@
Version 1.02.04 -
============================
Use name-based device refs if kernel doesn't support device number refs.
Fix memory leak (struct dm_ioctl) when struct dm_task is reused.
If _create_and_load_v4 fails part way through, revert the creation.
dmeventd thread/fifo fixes.
Add file & line to dm_strdup_aux().

80
libdm/ioctl/libdm-iface.c
View File

@ -59,7 +59,9 @@
#define NUMBER_OF_MAJORS 4096
/* dm major version no for running kernel */
static int _dm_version = DM_VERSION_MAJOR;
static unsigned _dm_version = DM_VERSION_MAJOR;
static unsigned _dm_version_minor = 0;
static unsigned _dm_version_patchlevel = 0;
static int _log_suppress = 0;
static dm_bitset_t _dm_bitset = NULL;
@ -745,7 +747,7 @@ static int _dm_task_run_v1(struct dm_task *dmt)
int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size)
{
unsigned int *v;
unsigned *v;
#ifdef DM_COMPAT
if (_dm_version == 1)
@ -759,6 +761,9 @@ int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size)
v = dmt->dmi.v4->version;
snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]);
_dm_version_minor = v[1];
_dm_version_patchlevel = v[2];
return 1;
}
@ -804,7 +809,7 @@ int dm_check_version(void)
if (!_dm_compat)
goto bad;
log_verbose("device-mapper ioctl protocol version %d failed. "
log_verbose("device-mapper ioctl protocol version %u failed. "
"Trying protocol version 1.", _dm_version);
_dm_version = 1;
if (_check_version(dmversion, sizeof(dmversion), 0)) {
@ -1115,6 +1120,40 @@ static void *_add_target(struct target *t, void *out, void *end)
return out;
}
static int _lookup_dev_name(uint64_t dev, char *buf, size_t len)
{
struct dm_names *names;
unsigned next = 0;
struct dm_task *dmt;
int r = 0;
if (!(dmt = dm_task_create(DM_DEVICE_LIST)))
return 0;
if (!dm_task_run(dmt))
goto out;
if (!(names = dm_task_get_names(dmt)))
goto out;
if (!names->dev)
goto out;
do {
names = (void *) names + next;
if (names->dev == dev) {
strncpy(buf, names->name, len);
r = 1;
break;
}
next = names->next;
} while (next);
out:
dm_task_destroy(dmt);
return r;
}
static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
{
const size_t min_size = 16 * 1024;
@ -1202,16 +1241,6 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
dmi->data_size = len;
dmi->data_start = sizeof(struct dm_ioctl);
if (dmt->dev_name)
strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
if (dmt->type == DM_DEVICE_SUSPEND)
dmi->flags |= DM_SUSPEND_FLAG;
if (dmt->read_only)
dmi->flags |= DM_READONLY_FLAG;
if (dmt->skip_lockfs)
dmi->flags |= DM_SKIP_LOCKFS_FLAG;
if (dmt->minor >= 0) {
if (dmt->major <= 0) {
log_error("Missing major number for persistent device.");
@ -1221,9 +1250,31 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt, unsigned repeat_count)
dmi->dev = MKDEV(dmt->major, dmt->minor);
}
/* Does driver support device number referencing? */
if (_dm_version_minor < 3 && !dmt->dev_name && !dmt->uuid && dmi->dev) {
if (!_lookup_dev_name(dmi->dev, dmi->name, sizeof(dmi->name))) {
log_error("Unable to find name for device (%" PRIu32
":%" PRIu32 ")", dmt->major, dmt->minor);
goto bad;
}
log_verbose("device (%" PRIu32 ":%" PRIu32 ") is %s "
"for compatibility with old kernel",
dmt->major, dmt->minor, dmi->name);
}
if (dmt->dev_name)
strncpy(dmi->name, dmt->dev_name, sizeof(dmi->name));
if (dmt->uuid)
strncpy(dmi->uuid, dmt->uuid, sizeof(dmi->uuid));
if (dmt->type == DM_DEVICE_SUSPEND)
dmi->flags |= DM_SUSPEND_FLAG;
if (dmt->read_only)
dmi->flags |= DM_READONLY_FLAG;
if (dmt->skip_lockfs)
dmi->flags |= DM_SKIP_LOCKFS_FLAG;
dmi->target_count = count;
dmi->event_nr = dmt->event_nr;
@ -1623,6 +1674,9 @@ repeat_ioctl:
break;
}
/* Was structure reused? */
if (dmt->dmi.v4)
dm_free(dmt->dmi.v4);
dmt->dmi.v4 = dmi;
return 1;