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Avoid finding problems in vg_validate when restoring
invalid VG metadata as that would lead to internal error.
i.e. adding unsupported METADATA_FLAG to zero segtype
can trigger such thing.
Previous update needed to add handling segtype within flag.c
which somewhat breaks API separition and also had bug in hanlding
actual flags.
So instead keep segtype code in _read_segtype_and_lvflags() within
import_vsn1.c and handle purly flags in read_lvflags() from const
string.
Instead of duplicating whole segtype string with flags and
using 2 calls read_segtype_lvflags() + get_segtype_from_string(),
merge the functionality into a single read_segtype_and_lvflags().
This allows to make only a local string copy (no allocs) and eventually
to not copy segtype string at all, when there are no flags.
As the 'emit_to_buffer' uses relatively complex
vsnprintf() call inside, try to reduce number
of unnecessary calls and try replace some more
complex string build with a single call instead.
Since we detect 'debug' level after calling 'log_debug()' - all
the arguments are evaluated, so in this case display_lvname() was
preparing a string that is not used in case debugging is not enabled.
So since these string are on 'hot-path' and it's already known
which VG is being worked on, in these few cases just use lv->name.
Replace use of dm_hash with radix_tree when making PV index names.
Store just the index number itself and use pv%d for outf() string.
For lookup up a PV - use just the PV pointer itself, it's faster then
converint for it's ID to UUID format.
Split single check_lv_segments() into 2 separate
versions so they can be called independently.
This allow to 'skip' already checked segment
check after it's been imported to VG and also
avoid another repeated checking when validating
segment with complete vg.
**
check_lv_segments_incomplete_vg()
this check just basic LV segment properties and does not
validate those requiring full VG.
**
check_lv_segments_complete_vg()
Remaining check that expects complete VG is present.
Track whether import has even seen segment of LV with log_lv,
and call fixup mirror only in this case.
Also avoid repeated lookup of get_segtype_from_string for
SEG_TYPE_NAME_MIRROR.
The lv_hash wasn't being passed to the seg-specific text import
functions, so they were doing many find_lv() calls which consumes
a lot of time when there are many LVs in the metadata.
Coverity is complaining about unchecked strcpy here, which is
irelevant as we preallocate buffer to fit in copied string,
however we could actually reuse these size and use just memcpy().
So lets make some simple conversions.
When we tested lvm2, the kernel injected various random faults.
(gdb) bt
...
(gdb) p vg
$1 = (struct volume_group *) 0x0
(gdb) p use_previous_vg
$2 = (unsigned int *) 0x0
Signed-off-by: Wu Guanghao <wuguanghao3@huawei.com>
When compiled and used with:
CFLAGS="-fsanitize=address -g -O0"
ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1
we have few reported issue - they where not normally spotted, since
we were still accessing our own memory - but ouf of buffer-range.
TODO: there is still something to enhance with handling of #orphan vgids
Resolve event_activation configure option just once.
Do not print debug_devs about 'bad' filtering, when
actually filter already printed reason for skipping
Do not trace more then once about backup being disabled.
No debug when unlinked file does not exists in pvscan.
Do not store full path with each archived name reduces memory usage if
the directory has thousands of entries and just add 'dir' path when
needed.
Also emit info print message to a user if the total size of archived
files for a VG is more then 128MiB or 8192 files.
TODO: Consider wheather adding a new 'lvm.conf archive{option}' to support
trimming these wild archive sizes can make situation better.
We already support retain_min && retain_days - but if user is
generating too many and too large archives with minutes - maybe archiving
should be disabled by a user - as it's not producing anything largely usable
and just slows-down command ??
If we add 'retain_max & retain_max_size' the condition will go against
each other and we need to chose priorities.
mm
Corrupt metadata text (with good mda header) was being handled
in the label_scan phase, but not in the vg_read phase. This
was sufficient because metadata areas would always be read and
checksummed during label_scan (metadata parsing was skipped
previously as an optimization.)
This changed with the optimization in
commit 61a6f9905e
"metadata: optimize reading metadata copies in scan"
Now, some metadata areas will not be read and checksummed
at all during the label_scan phase, only during the vg_read
phase. This means that bad metadata text may first be detected
in the vg_read phase. So, add equivalent bad metadata handling
to the vg_read path to match the label_scan path.
While being in lockless scanning phase, we can avoid reading and checking
matching metadata copies if we already know them from other PV
and just rely on matching metadata header information.
These copies will be examined later during locked metadata read/write
access.
This patch may postpone discovering some read failures to locked phase.
When creating lvm2 metadata for VG, lvm2 allocate some buffer,
and if buffer is not big enough, the buffer is 'reallocated' bigger,
and whole metadata creation is repeated until metadata fits.
We can try to use 'previous' metadata size as hint to reduce looping
here.
