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pvscan: check sysfs dev entry before rescan

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When pvscan --cache --major --minor command is issued from
udev REMOVE event, it basically resulted into a whole device
scan since the device was missing. So avoid such scan
and first check via /sysfs (when available) if such device actually
exists.
This commit is contained in:
Zdenek Kabelac 2015-03-18 16:19:58 +01:00
parent 1260b86b2b
commit 32a6c11877
2 changed files with 20 additions and 0 deletions
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1
WHATS_NEW
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@ -1,5 +1,6 @@
Version 2.02.118 -
=================================
Avoid rescan of all devices when requested pvscan for removed device.
Measure configuration timestamps with nanoseconds when available.
Disable lvchange of major and minor of pool LVs.
Fix pvscan --cache to not scan and read ignored metadata areas on PVs.

19
lib/device/dev-cache.c
View File

@ -986,12 +986,31 @@ static struct device *_dev_cache_seek_devt(dev_t dev)
*/
struct device *dev_cache_get_by_devt(dev_t dev, struct dev_filter *f)
{
char path[PATH_MAX];
const char *sysfs_dir;
struct stat info;
struct device *d = _dev_cache_seek_devt(dev);
if (d && (d->flags & DEV_REGULAR))
return d;
if (!d) {
sysfs_dir = dm_sysfs_dir();
if (sysfs_dir && *sysfs_dir) {
/* First check if dev is sysfs to avoid useless scan */
if (dm_snprintf(path, sizeof(path), "%s/dev/block/%d:%d",
sysfs_dir, (int)MAJOR(dev), (int)MINOR(dev)) < 0) {
log_error("dm_snprintf partition failed.");
return NULL;
}
if (lstat(path, &info)) {
log_debug("No sysfs entry for %d:%d.",
(int)MAJOR(dev), (int)MINOR(dev));
return NULL;
}
}
_full_scan(0);
d = _dev_cache_seek_devt(dev);
}