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filters: swap device_is_usable test

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Fix regression introduced with commit:
2fc126b00d

This commit has moved  pv_min_size() test in front
of device_is_usable(). However pv_min_size needs to open device,
so it may have actually get blocked.

So restore the original order and first validate
dm device to be usable for open.

It's worth to note that such check is not 'race-free',
but it usually eliminates 99.99% of problems ;).
This commit is contained in:
Zdenek Kabelac 2015-09-02 16:08:30 +02:00
parent a3c7e326c3
commit 81a9da8f61
2 changed files with 22 additions and 20 deletions
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2
WHATS_NEW
View File

@ -1,5 +1,7 @@
Version 2.02.130 -
===================================
Check if dm device is usable before checking its size (2.02.116).
Extend parsing of cache_check version in configure.
Make lvpoll error messages visible in lvmpolld's stderr and in syslog.
Add 'make install_full_man' to install all man pages regardless of config.

36
lib/filters/filter-usable.c
View File

@ -112,25 +112,10 @@ static int _passes_usable_filter(struct dev_filter *f, struct device *dev)
{
filter_mode_t mode = *((filter_mode_t *) f->private);
struct dev_usable_check_params ucp = {0};
int r;
/* check if the device is not too small to hold a PV */
switch (mode) {
case FILTER_MODE_NO_LVMETAD:
/* fall through */
case FILTER_MODE_PRE_LVMETAD:
if (!_check_pv_min_size(dev))
return 0;
break;
case FILTER_MODE_POST_LVMETAD:
/* nothing to do here */
break;
}
int r = 1;
/* further checks are done on dm devices only */
if (!dm_is_dm_major(MAJOR(dev->dev)))
return 1;
if (dm_is_dm_major(MAJOR(dev->dev))) {
switch (mode) {
case FILTER_MODE_NO_LVMETAD:
ucp.check_empty = 1;
@ -163,7 +148,22 @@ static int _passes_usable_filter(struct dev_filter *f, struct device *dev)
}
if (!(r = device_is_usable(dev, ucp)))
log_debug_devs("%s: Skipping unusable device", dev_name(dev));
log_debug_devs("%s: Skipping unusable device.", dev_name(dev));
}
if (r) {
/* check if the device is not too small to hold a PV */
switch (mode) {
case FILTER_MODE_NO_LVMETAD:
/* fall through */
case FILTER_MODE_PRE_LVMETAD:
r = _check_pv_min_size(dev);
break;
case FILTER_MODE_POST_LVMETAD:
/* nothing to do here */
break;
}
}
return r;
}