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For large device sets our dm_hash can produce larger amounf of mapping
collision and we would need to further increase our has size.
So instead use the radix_tree code which is immune agains growing size
of devices and uses memory more effiecently to store all the paths.
Instead of less efficient 'btree' switch dev_cache to use
radix_tree, that is generating more efficient tree mapping.
Some direct use of btree iteration replace with our dev_iter code.
Convert the persisten filter to use more memory compact radix_tree as
dm_hash is bound to preallocated number of slots and stores whole
key together with value.
When DM uuid cache is available, we can possibly avoid unnecessary
status ioctl() when we check the device for 'usable' uuid.
If this test passes the existing code will got through the full check.
Move the code around caching active dm device devno, name and uuid
from device_mapper/libdm-iface to dev_cache file - as libdm layer
cares about 'decoding' ioctl data from kernel and caching for use by
lvm stays within lvm.
Introduce:
dev_cache_update_dm_devs
dev_cache_get_dm_dev_by_devno
dev_cache_get_dm_dev_by_uuid
Use radix_tree for searching.
Do not attach layer suffix to the UUID when activating component LV.
In this case we want to see allow this LV to be public, thus
such LV should not be using -layer suffix in its UUID.
This also requires that our 'cached' access will check for
both UUID (with & without suffix) which was unnoticed issue before.
This change is now necesssary since our udev rule automatically expects
any LV with -layer suffix is private and will prevent generaring
any systemd unit even when there are no 'DM' flags bits passed via
cookie mechanism while creating such LV.
In order to free SubLVs after a stripe removing reshape, lvconvert has
to be run without layout changes. Prevent a layout changing request
in case any such freed SubLVs exist and inform the user about the fact
requesting to release them first.
Calculates expected size before/after reshapes adding/removing stripes
to/from RaidLVs with levels 4/5/6/10 and compares it with the actual
one the block layer shows. Stripes reshaped to are listed in the
tst_stripes variable. mkfs/fsck/resize2fs the respective RaidLVs
to confirm ext4 can be resized accordingly without issues.
We automatically ignore these devs, when lvm2 create devs,
whoever when lvm2 database is dropped or someone just
created these devs with such formated UUID, there is no
other informantion then to check DM UUID.
SUSE kernels distribution enables CONFIG_PRINTK_CALLER by default.
One line of cat /dev/kmsg is like:
6,904,9506214456,-,caller=T24012;loop8: detected capacity change from 0
to 354304
If CONFIG_PRINTK_CALLER is off:
6,721,53563833,-;loop0: detected capacity change from 0 to 354304
',caller=T24012' is the redundant part needed to be handled.
Otherwise pos will be lager than buf size causing sz underflowed.
Then constructor of std::string will throw a exception to break
tests:
$ make check_local T=shell/000-basic.sh
VERBOSE=0 ./lib/runner \
--testdir . --outdir results \
--flavours ndev-vanilla --only shell/000-basic.sh --skip @
running 1 tests
running: [ndev-vanilla] shell/000-basic.sh
0:00.000Exception: basic_string::_M_create
make[1]: *** [Makefile:148: check_local] Error 1
make[1]: Leaving directory '/root/lvm2/test'
make: *** [Makefile:89: check_local] Error 2
Fix it with strchr for ';' as delimiter to get pos.
Reported-by: Su Yue <glass.su@suse.com>
To more easily adopt radix_tree over existing code base, add
abstraction over 'radix_tree_iterate' which basically builds
an array of all traversed values, and then it's just easy to
go over all array elements.
TODO: code should be converted to use radix_tree_iterate()
directly as it's more efficient.
Note: it can be possibly to rewrite recursive _iterate() usage
to linear travesal, not sure whether it's worth the effort
as conversion to 'radix_itree_iterator' is relatively simple.
Add simple 'wrapper' inline functions to insert or return ptr lookup value.
(So the user doesn't need to deal with 'union radix_value' locally and
also it makes easier to translage some lvm2 functions to use radix_tree).
Note: If the stored 'value' would NULL, it cannot be recognized
from a case of 'not found'. So usable only when 'values' stored with
tree are not NULL.
Some updates to _dump() debugging function so the printed result
can be more easily examined by human.
Also print 'prefix' as string when all chars are printable.
Add 'simple' variant of _dump also to 'simple' version of radix tree
(which is however normally not compiled).
Instead of using 'key state & key end' uint8_t* switch to use
void* key, & size_t keylen. This allows easier adaptation with
lvm code base with way too much casting with every use of function.
Also correctly mark const buffers to avoid compiled warnings and
casting.
Adapt the only bcache user ATM for API change.
Adapt unit test to match changed API.
Fix commit b65a2c3f3a "vgimportdevices: skip lvmlockd locking"
which intended to disable lvmlockd locking, but the lockd_gl_disable
flag was mistakenly set after lock_global() so it wasn't effective.
This caused vgimportdevices to fail unless locking was started.
Enums are single 'values' so not a proper type for bitfields.
(Probably better to use such values as defines).
Although here 'daemon_talk()' is part of library API, it's hidden
non-public API call - and moreover 'enum' and 'unsigned' are
using the same size, so linker shouldn't have any issue with
this symbol usage.
For this reason there are no 'versioning' tricks applied.
