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PV header extension comes just beyond the existing PV header base:
PV header base (existing):
- uuid
- device size
- null-terminated list of Data Areas
- null-terminater list of MetaData Areas
PV header extension:
- extension version
- flags
- null-terminated list of Embedding Areas
This patch also adds "eas" (Embedding Areas) list to lvmcache (lvmcache_info)
and it also adds support for common operations on the list (just like for
already existing "das" - Data Areas list):
- lvmcache_add_ea
- lvmcache_update_eas
- lvmcache_foreach_ea
- lvmcache_del_eas
Also, add ea_start and ea_size to struct physical_volume for processing
PV Embedding Area location throughout the code (currently only one
Embedding Area is supported, though the definition on disk allows for
more if needed in the future...).
Also, define FMT_EAS format flag to mark that the format actually
supports Embedding Areas (currently format-text only).
fmt1 doesn't have a separate commit function: updates take effect
immediately vg_write is called, so we must update lvmetad at this
point if we're going to go on and ask lvmetad for the VG metadata
again before calling the commit function (though that's probably an
unsupported and pointless thing to do anyway as the client must
already have that data and it cannot have changed because it's locked
and with devs suspended we shouldn't be communicating with lvmetad;
so when that's fixed properly, this fix here can be reverted).
This problem showed up as an internal error when lvremoving an LVM1
snapshot.
> Internal error: LV snap1 (00000000000000000000000000000001) missing from preload metadata
https://bugzilla.redhat.com/891855
Rename lvmetad_warning() to lvmetad_connect_or_warn().
Log all connection attempts on the client side, whether successful or not.
Reduce some nesting and remove a redundant assertion.
Calling pvscan --cache with -aay on a PV without an MDA would spuriously fail
with an internal error, because of an incorrect assumption that a parsed VG
structure was always available. This is not true and the autoactivation handler
needs to call vg_read to obtain metadata in cases where the PV had no MDAs to
parse. Therefore, we pass vgid into the handler instead of the (possibly NULL)
VG coming from the PV's MDA.
We were using daemon_send_simple until now, but it is no longer adequate, since
we need to manipulate requests in a generic way (adding a validity token to each
request), and the tree-based request interface is much more suitable for this.
Accept -q as the short form of --quiet.
Suppress non-essential standard output if -q is given twice.
Treat log/silent in lvm.conf as equivalent to -qq.
Review all log_print messages and change some to
log_print_unless_silent.
When silent, the following commands still produce output:
dumpconfig, lvdisplay, lvmdiskscan, lvs, pvck, pvdisplay,
pvs, version, vgcfgrestore -l, vgdisplay, vgs.
[Needs checking.]
Non-essential messages are shifted from log level 4 to log level 5
for syslog and lvm2_log_fn purposes.
Adding couple INTERNAL_ERROR reports for unwanted parameters:
Ensure the 'top' metadata node cannot be NULL for lvmetad.
Make obvious vginfo2 cannot be NULL.
Report internal error if handler and vg is undefined.
Check for handle in poll_vg().
Ensure seg is not NULL in dev_manager_transient().
Report missing read_ahead for _lv_read_ahead_single().
Check for report handler in dm_report_object().
Check missing VG in _vgreduce_single().
Define an 'activation_handler' that gets called automatically on
PV appearance/disappearance while processing the lvmetad_pv_found
and lvmetad_pv_gone functions that are supposed to update the
lvmetad state based on PV availability state. For now, the actual
support is for PV appearance only, leaving room for PV disappearance
support as well (which is a more complex problem to solve as this
needs to count with possible device stack).
Add a new activation change mode - CHANGE_AAY exposed as
'--activate ay/-aay' argument ('activate automatically').
Factor out the vgchange activation functionality for use in other
tools (like pvscan...).
Add 3rd daemon return state "unknown" for lookups that are carried out
successfully but don't find the item requested.
Avoid issuing error messages when it's expected that a device that's
being looked up in lvmetad might not be there.
Hold global lock in pvscan --lvmetad. (This might need refinement.)
Add PV name to "PV gone" messages.
Adjust some log message severities. (More changes needed.)
Properly detect if the filters were refreshed properly.
(May needs few more fixes ??)
Filter refresh may fail because it may be out of free file descriptors
when clvmd gets overloaded.
leaving behind the LVM-specific parts of the code (convenience wrappers that
handle `struct device` and `struct cmd_context`, basically). A number of
functions have been renamed (in addition to getting a dm_ prefix) -- namely,
all of the config interface now has a dm_config_ prefix.
Add config option to enable crc checking of VG structures.
Currently it's disabled by default.
For the internal test-suite this check it is enabled.
Note: In the case the internal error is detected, debug build with
compile option DEBUG_ENFORCE_POOL_LOCKING helps to catch the source
of the problem.
Use debug pool locking functionality. So the command could check,
whether the memory in the pool has not been modified.
For lv_postoder() instead of unlocking and locking for every changed
struct status member do it once when entering and leaving function.
(mprotect would trap each such memory access).
Currently lv_postoder() does not modify other part of vg structure
then status flags of each LV with flags that are reverted back to
its original state after function exit.
Extend vginfo cache with cached VG structure. So if the same metadata
are use, skip mda decoding in the case, the same data are in use.
This helps for operations like activation of all LVs in one VG,
where same data were decoded giving the same output result.
Patch adds 1-to-1 connection between volume_group and lvmcache_vginfo.
Move the free_vg() to vg.c and replace free_vg with release_vg
and make the _free_vg internal.
Patch is needed for sharing VG in vginfo cache so the release_vg function name
is a better fit here.
Instead of regenerating config tree and parsing same data again,
check whether export_vg_to_buffer does not produce same string as
the one already cached - in this case keep it, otherwise throw cached
content away.
For the code simplicity calling _free_cached_vgmetadata() with
vgmetadata == NULL as the function handles this itself.
Note: sometimes export_vg_to_buffer() generates almost the same data
with just different time stamp, but for the patch simplicity,
data are reparsed in this case.
This patch currently helps for vgrefresh.
Invalid primary_vginfo was supposed to move all its lvmcache_infos to
orphan_vginfo - however it has called _drop_vginfo() inside the loop
that released primary_vginfo itself - thus made the loop using released
memory.
Use _vginfo_detach_info() instead and call _drop_vginfo after
th loop is finished.
Valgrind trace it should fix:
Invalid read of size 8
at 0x41E960: _lvmcache_update_vgname (lvmcache.c:1229)
by 0x41EF86: lvmcache_update_vgname_and_id (lvmcache.c:1360)
by 0x441393: _text_read (text_label.c:329)
by 0x442221: label_read (label.c:289)
by 0x41CF92: lvmcache_label_scan (lvmcache.c:635)
by 0x45B303: _vg_read_by_vgid (metadata.c:3342)
by 0x45B4A6: lv_from_lvid (metadata.c:3381)
by 0x41B555: lv_activation_filter (activate.c:1346)
by 0x415868: do_activate_lv (lvm-functions.c:343)
by 0x415E8C: do_lock_lv (lvm-functions.c:532)
by 0x40FD5F: do_command (clvmd-command.c:120)
by 0x413D7B: process_local_command (clvmd.c:1686)
Address 0x63eba10 is 16 bytes inside a block of size 160 free'd
at 0x4C2756E: free (vg_replace_malloc.c:366)
by 0x41DE70: _free_vginfo (lvmcache.c:980)
by 0x41DEDA: _drop_vginfo (lvmcache.c:998)
by 0x41E854: _lvmcache_update_vgname (lvmcache.c:1238)
by 0x41EF86: lvmcache_update_vgname_and_id (lvmcache.c:1360)
by 0x441393: _text_read (text_label.c:329)
by 0x442221: label_read (label.c:289)
by 0x41CF92: lvmcache_label_scan (lvmcache.c:635)
by 0x45B303: _vg_read_by_vgid (metadata.c:3342)
by 0x45B4A6: lv_from_lvid (metadata.c:3381)
by 0x41B555: lv_activation_filter (activate.c:1346)
by 0x415868: do_activate_lv (lvm-functions.c:343)
problematic line:
dm_list_iterate_items_safe(info2, info3, &primary_vginfo->infos)
Missing free_vg on error_path in lvmcache_get_vg fn. Call destroy_instance
only if the fid is not part of the vg in backup_read_vg fn (otherwise it's
part of the VG we're returning and we definitely don't want to destroy it!).
New strategy for memory locking to decrease the number of call to
to un/lock memory when processing critical lvm functions.
Introducing functions for critical section.
Inside the critical section - memory is always locked.
When leaving the critical section, the memory stays locked
until memlock_unlock() is called - this happens with
sync_local_dev_names() and sync_dev_names() function call.
memlock_reset() is needed to reset locking numbers after fork
(polldaemon).
The patch itself is mostly rename:
memlock_inc -> critical_section_inc
memlock_dec -> critical_section_dec
memlock -> critical_section
Daemons (clmvd, dmevent) are using memlock_daemon_inc&dec
(mlockall()) thus they will never release or relock memory they've
already locked memory.
Macros sync_local_dev_names() and sync_dev_names() are functions.
It's better for debugging - and also we do not need to add memlock.h
to locking.h header (for memlock_unlock() prototyp).
