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When using lvm shell, some structures which are cached in memory may be reused. This happens for the struct label (a part of lvmcache_info structure) when lvmetad is used in which case the PV scan is not done that would normally overwrite these label structures in memory and making them up-to-date. This is all consequence of the fact that struct lvmcache_info and struct label are not always assigned in the same part of the code. For example, if lvmetad *is not* used, parts of the struct label are reassigned in label_read fn while struct lvmcache_info is created elsewhere. No part of the code reused struct label (and its "dev" field) before calling label_read fn. That's why the real bug is hidden when using lvm shell without lvmetad. However, with lvmetad and lvm shell, the situation is a bit different. The label_read fn is not called if lvmetad *is* used, hence the struct label may have ended up not initialized properly. There was missing assignment for the dev field in struct label in _text_pv_write fn which caused this problem to appear in lvm shell with lvmetad, for example: Before this patch: lvm> pvcreate /dev/sda Physical volume "/dev/sda" successfully created lvm> pvs /dev/sda PV VG Fmt Attr PSize PFree unknown device lvm2 --- 128.00m 128.00m With this patch applied: lvm> pvcreate /dev/sda Physical volume "/dev/sda" successfully created lvm> pvs /dev/sda PV VG Fmt Attr PSize PFree /dev/sda lvm2 --- 128.00m 128.00m Also, this problem had not appeared before changes introduced by commits |
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| Makefile.in | ||