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There are likely more bits of code that can be removed,
e.g. lvm1/pool-specific bits of code that were identified
using FMT flags.
The vgconvert command can likely be reduced further.
The lvm1-specific config settings should probably have
some other fields set for proper deprecation.
For reporting commands (pvs,vgs,lvs,pvdisplay,vgdisplay,lvdisplay)
we do not need to repeat the label scan of devices in vg_read if
they all had matching metadata in the initial label scan. The
data read by label scan can just be reused for the vg_read.
This cuts the amount of device i/o in half, from two reads of
each device to one. We have to be careful to avoid repairing
the VG if we've skipped rescanning. (The VG repair code is very
poor, and will be redone soon.)
The copy of VG metadata stored in lvmcache was not being used
in general. It pretended to be a generic VG metadata cache,
but was not being used except for clvmd activation. There
it was used to avoid reading from disk while devices were
suspended, i.e. in resume.
This removes the code that attempted to make this look
like a generic metadata cache, and replaces with with
something narrowly targetted to what it's actually used for.
This is a way of passing the VG from suspend to resume in
clvmd. Since in the case of clvmd one caller can't simply
pass the same VG to both suspend and resume, suspend needs
to stash the VG somewhere that resume can grab it from.
(resume doesn't want to read it from disk since devices
are suspended.) The lvmcache vginfo struct is used as a
convenient place to stash the VG to pass it from suspend
to resume, even though it isn't related to the lvmcache
or vginfo. These suspended_vg* vginfo fields should
not be used or touched anywhere else, they are only to
be used for passing the VG data from suspend to resume
in clvmd. The VG data being passed between suspend and
resume is never modified, and will only exist in the
brief period between suspend and resume in clvmd.
suspend has both old (current) and new (precommitted)
copies of the VG metadata. It stashes both of these in
the vginfo prior to suspending devices. When vg_commit
is successful, it sets a flag in vginfo as before,
signaling the transition from old to new metadata.
resume grabs the VG stashed by suspend. If the vg_commit
happened, it grabs the new VG, and if the vg_commit didn't
happen it grabs the old VG. The VG is then used to resume
LVs.
This isolates clvmd-specific code and usage from the
normal lvm vg_read code, making the code simpler and
the behavior easier to verify.
Sequence of operations:
- lv_suspend() has both vg_old and vg_new
and stashes a copy of each onto the vginfo:
lvmcache_save_suspended_vg(vg_old);
lvmcache_save_suspended_vg(vg_new);
- vg_commit() happens, which causes all clvmd
instances to call lvmcache_commit_metadata(vg).
A flag is set in the vginfo indicating the
transition from the old to new VG:
vginfo->suspended_vg_committed = 1;
- lv_resume() needs either vg_old or vg_new
to use in resuming LVs. It doesn't want to
read the VG from disk since devices are
suspended, so it gets the VG stashed by
lv_suspend:
vg = lvmcache_get_suspended_vg(vgid);
If the vg_commit did not happen, suspended_vg_committed
will not be set, and in this case, lvmcache_get_suspended_vg()
will return the old VG instead of the new VG, and it will
resume LVs based on the old metadata.
This partially reverts commit da37cbd24f.
As the _cmdline structure use mempool for allocated ellement
that is being release on cmd_context close.
Before the better fix is made - restore previous logic and
reinitialize cmd structures again for new cmd_context.
Problem can be hit with e.g. this test run:
make check_local T=foreign LVM_VALGRIND_DMEVENTD=1
Invalid read of size 1
at 0x4C31C83: strcmp (vg_replace_strmem.c:846)
by 0x6BA0939: _find_command (lvmcmdline.c:1555)
by 0x6BA4304: lvm_run_command (lvmcmdline.c:2810)
by 0x6BD5E02: lvm2_run (lvmcmdlib.c:91)
by 0x685607E: dmeventd_lvm2_run (dmeventd_lvm.c:118)
by 0x6652684: _use_policy (dmeventd_thin.c:117)
by 0x6652E56: process_event (dmeventd_thin.c:298)
by 0x10CC5A: _do_process_event (dmeventd.c:945)
by 0x10CF83: _monitor_thread (dmeventd.c:1033)
by 0x54B35E0: start_thread (in /usr/lib64/libpthread-2.26.9000.so)
by 0x57C30EE: clone (in /usr/lib64/libc-2.26.9000.so)
Address 0x6266270 is 4,352 bytes inside a block of size 8,192 free'd
at 0x4C2ED68: free (vg_replace_malloc.c:530)
by 0x5289142: dm_free_wrapper (dbg_malloc.c:393)
by 0x528998A: _free_chunk (pool-fast.c:318)
by 0x52892A6: dm_pool_destroy (pool-fast.c:78)
by 0x6A8E52C: destroy_toolcontext (toolcontext.c:2254)
by 0x6BA5BD6: lvm_fin (lvmcmdline.c:3327)
by 0x6BD5EA7: lvm2_exit (lvmcmdlib.c:123)
by 0x6856013: dmeventd_lvm2_exit (dmeventd_lvm.c:103)
by 0x66535B8: unregister_device (dmeventd_thin.c:432)
by 0x10CBBC: _do_unregister_device (dmeventd.c:926)
by 0x10CD74: _monitor_unregister (dmeventd.c:979)
by 0x10D094: _monitor_thread (dmeventd.c:1066)
by 0x54B35E0: start_thread (in /usr/lib64/libpthread-2.26.9000.so)
by 0x57C30EE: clone (in /usr/lib64/libc-2.26.9000.so)
Block was alloc'd at
at 0x4C2DBBB: malloc (vg_replace_malloc.c:299)
by 0x5288F46: dm_malloc_aux (dbg_malloc.c:287)
by 0x52890AC: dm_malloc_wrapper (dbg_malloc.c:371)
by 0x52898E6: _new_chunk (pool-fast.c:286)
by 0x52893BA: dm_pool_alloc_aligned (pool-fast.c:106)
by 0x5289310: dm_pool_alloc (pool-fast.c:90)
by 0x6A8A21A: _load_config_file (toolcontext.c:808)
by 0x6A8A3D9: _init_lvm_conf (toolcontext.c:842)
by 0x6A8D3BD: create_toolcontext (toolcontext.c:1941)
by 0x6BA5B24: init_lvm (lvmcmdline.c:3308)
by 0x6BD5B7C: cmdlib_lvm2_init (lvmcmdlib.c:34)
by 0x6BD5EB8: lvm2_init (lvm2cmd.c:20)
by 0x6855EA7: dmeventd_lvm2_init (dmeventd_lvm.c:67)
by 0x665305F: register_device (dmeventd_thin.c:352)
by 0x10CB7A: _do_register_device (dmeventd.c:916)
by 0x10CEE4: _monitor_thread (dmeventd.c:1006)
by 0x54B35E0: start_thread (in /usr/lib64/libpthread-2.26.9000.so)
by 0x57C30EE: clone (in /usr/lib64/libc-2.26.9000.so)
When large size number (>2^31) is given on command line it could be
misdetected and in certain cases lead to wrongly casted number.
So make sure all cases always do set _MAX number in case the value would
not fit within the supported range instead of getting some random value
within the range.
In most cases this was not a problem to detect, but i.e. stripesize
parameter might have been fooled by certain large numbers.
- Use 'lvmcache' consistently instead of 'metadata cache'
- Always use 5 characters for source line number
- Remember to convert uuids into printable form
- Use <no name> rather than (null) when VG has no name.
The persistent filter should not be imported by any command that doesn't
use it so take addtional note of REQUIRES_FULL_LABEL_SCAN (for vgrename)
and introduce IGNORE_PERSISTENT_FILTER for vgscan and pvscan.
Add an independent command definition for "vgchange --locktype",
and split the implementation out of the set of common metadata
changes. It is unlike normal metadata changes, and can only
be run by itself. (Changing the lock type is similar in
principle to changing the VG name or the VG system ID; it
effects the ability of any host to see or access the VG.)
At some point this command lost the ability to forcibly change
the lock type of a shared VG to "none" (making it a local VG).
This can be necessary to repair shared VGs (e.g. recovery steps
that occur in vg_read are disabled for shared VGs because
they are not locked properly, or recovering sanlock locks
when the PV holding them is lost.)
"vgchange --locktype none --lockopt force VG" is used as the
method of forcing the shared VG to become local so that it
can be repaired.
Commit 9b4b5d449e started to accept
rather way to wide set of strings we do not want to take for size.
i.e. lvresize -t vg0/lvol0 -LNaNM
Restore check for 'digit || locales defined 'dot' | '.'
(as we tend to take '.' even if locales uses ',')
Explictely detect duplicate sing symbols and leave the rest of
double number validation on 'strtod()' function. This way
we can also accept size like:
lvcreate -L.1M
We already accept -L0.1M - but it's common to accept numbers
starting with leading '.' - just as 'strtod()' accepts it).
API for strtod() or strtoul() needs reset of errno, before it's being
called. So add missing resets in missing places and some also some
errno validation for out-of-range numbers.
Since we are reading size as (double) we can get way bigger
number then just plain int64. So to make this check actually
more valid and usable do a maxsize compare in 'double'.
Fix the error messages when an unrecognized command is
run from a script. We shouldn't attempt to parse options
for an unrecognized command name, which causes misleading
errors about bad options, but rather exit right when we
know the command name is not valid. Also don't complain
about exiting without an error message when running a
script if no command didn't exist.
lvm_run needs to place NULL as the last element into argv[].
Otherwise we get:
Conditional jump or move depends on uninitialised value(s)
_command_required_pos_matches (lvmcmdline.c:1443)
_find_command (lvmcmdline.c:1610)
lvm_run_command (lvmcmdline.c:2770)
lvm2_run (lvmcmdlib.c:91)
Clean up the handling of memory used for cmd defs
so it doesn't trip up memory debugging.
Allocate memory for commands[] from libmem.
Free temporary memory used by define_commands()
at the end of the function.
Clear all the command def state in in lvm_fin().
Using any arg with a command name in a script file
would cause the command to fail.
The name of the script file being executed was being passed
to lvm_register_commands() and define_commands(), which
prevented command defs from being defined (simple commands
were still being defined only by name which was enough for those
to still work when run trivially with no args).
The logic for suggesting the nearest valid command syntax
was missing the simplest case. If a command has only one
valid syntax, that is the one we should suggest. (We were
suggesting nothing in this case.)
When a cmd def RULE fails because of a disallowed
combination of options, improve the error message
to show the option combination, not just the options
that broke the rule.
A command def can include a specific constant option value,
but the value was not being checked for optional opts.
e.g. this is an incorrect command and does not match any
command defs:
lvconvert --type cache --cachepool vg/lv
However, it was mistakely being matched to this cmd def,
where the required options match, but the optional options
do not:
lonvert --cachepool LV_linear_striped_raid_cachepool
OO: --type cache-pool, ...
The optional options were mistakely considered matching
because 'cache' and 'cache-pool' were not being compared.
Don't abbreviate the --help output quite as much
when there are many command defs. Print all the
options in the cmd defs that are shown. --longhelp
output is unchanged and includes everything.
The recent command definitions commit took the command
name from argv[0] without applying basename to the value,
so a pathname, e.g. /usr/sbin, would cause lvm to not
recognize the command name.
Repairing missing devices does not work reliably
with lvmetad, so disable lvmetad before repair.
A standard lvmetad refresh (pvscan --cache) will
enable lvmetad again.
When a given command:
- matches command definition A based on required options,
but uses optional options that are not accepted by A.
- matches command definition B based on required options,
(but fewer required items than A), and uses no
unaccepted optional options.
then B is the correct choice. Command A would fail because
of the unaccepted optional options. The logic was mistakenly
letting A win because it had a greater number of required option
matches, without accounting for the optional option mismatches.
