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metadata: log warning instead of error if device not found while checking used and assumed devs

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When checking assumed PVs against real devices used for LVs and if
there's no device assigned for an assumed PV (e.g. due to filters),
do log_warn instead of log_error and continue checking LV segments
and associated assumed PVs further, just like we do log_warn elsewhere
in this situation.

This way user will see the warning for each LV which couldn't be
checked completely against real PVs used. Before, we logged only
the very first occurence of missing device for an LV in a VG and we
returned from the function doing this check for all the LVs in VG
immediately which may be a bit misleading because it didn't tell
user about all the other LVs and whether they could be checked
or not.

For example, we have this setup:

[0] fedora/~ # pvs
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda          lvm2 ---  128.00m 128.00m
  /dev/vda2  fedora lvm2 a--   19.49g      0

[0] fedora/~ # lvs -o+devices
  LV   VG     Attr       LSize   Devices
  root fedora -wi-ao----  19.00g /dev/vda2(0)
  swap fedora -wi-ao---- 500.00m /dev/vda2(4864)

Before this patch (only the very first LV in a VG is logged to have a
problem while checking used and assumed devices):

[0] fedora/~ # pvs --config 'devices/filter=["a|/dev/sda|", "r|.*|"]'
  WARNING: Device for PV Qcxpcy-XgtP-UD3s-PmG0-qLyE-Z0ho-DYsxoz not found or rejected by a filter.
  WARNING: Device for PV Qcxpcy-XgtP-UD3s-PmG0-qLyE-Z0ho-DYsxoz not found or rejected by a filter.
  Couldn't find device for segment belonging to fedora/root while checking used and assumed devices.
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda          lvm2 ---  128.00m 128.00m
  [unknown]  fedora lvm2 a-m   19.49g      0

With this patch applied (all LVs where we hit problem while checking
used and assumed devices are logged and it's warning, not error):

[0] fedora/~ # pvs --config 'devices/filter=["a|/dev/sda|", "r|.*|"]'
  WARNING: Device for PV Qcxpcy-XgtP-UD3s-PmG0-qLyE-Z0ho-DYsxoz not found or rejected by a filter.
  WARNING: Device for PV Qcxpcy-XgtP-UD3s-PmG0-qLyE-Z0ho-DYsxoz not found or rejected by a filter.
  WARNING: Couldn't find device for segment belonging to fedora/root while checking used and assumed devices.
  WARNING: Couldn't find device for segment belonging to fedora/swap while checking used and assumed devices.
  PV         VG     Fmt  Attr PSize   PFree
  /dev/sda          lvm2 ---  128.00m 128.00m
  [unknown]  fedora lvm2 a-m   19.49g      0
This commit is contained in:
Peter Rajnoha 2016-04-25 11:15:44 +02:00
parent eb8edccd58
commit 9d976c0002
1 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
lib/metadata/metadata.c
View File

@ -4597,6 +4597,7 @@ static int _check_devs_used_correspond_with_lv(struct dm_pool *mem, struct dm_li
struct device *dev;
struct lv_segment *seg;
uint32_t s;
int warned_about_no_dev = 0;
char *used_devnames = NULL, *assumed_devnames = NULL;
if (!(list = dev_cache_get_dev_list_for_lvid(lv->lvid.s + ID_LEN)))
@ -4629,10 +4630,13 @@ static int _check_devs_used_correspond_with_lv(struct dm_pool *mem, struct dm_li
for (s = 0; s < seg->area_count; s++) {
if (seg_type(seg, s) == AREA_PV) {
if (!(dev = seg_dev(seg, s))) {
log_error("Couldn't find device for segment belonging to "
"%s while checking used and assumed devices.",
display_lvname(lv));
return 0;
if (!warned_about_no_dev) {
log_warn("WARNING: Couldn't find device for segment belonging "
"to %s while checking used and assumed devices.",
display_lvname(lv));
warned_about_no_dev = 1;
}
continue;
}
if (!(dev->flags & DEV_USED_FOR_LV)) {
if (!found_inconsistent) {
@ -4653,11 +4657,10 @@ static int _check_devs_used_correspond_with_lv(struct dm_pool *mem, struct dm_li
if (!dm_pool_grow_object(mem, "\0", 1))
return_0;
assumed_devnames = dm_pool_end_object(mem);
log_warn("WARNING: Device mismatch detected for %s which is accessing %s instead of %s.",
display_lvname(lv), used_devnames, assumed_devnames);
}
log_warn("WARNING: Device mismatch detected for %s which is accessing %s instead of %s.",
display_lvname(lv), used_devnames, assumed_devnames);
return 1;
}