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In _process_one_vg, we should never proceed if the VG read fails with certain
conditions. If we cannot allocate or construct the volume_group structure,
we should not proceed - this is true regardless of the tool calling the
iterator. In other cases, when the volume group structure is constructed but
there is some error (PVs missing, metadata corrupted, etc), some tools may
want to process the VG while others may not.
Author: Dave Wysochanski <dwysocha@redhat.com>
In vg_backup_single, we should error out if we vg_read_error(vg) and the
error code we received was anything other than FAILED_INCONSISTENT.
Original code contained an error because C operator precedence.
Note - this was part of the vg_read() so no WHATS_NEW entry neceesary.
Author: Dave Wysochanski <dwysocha@redhat.com>
Remove READ_REQUIRE_RESIZEABLE flag from vgsplit similar to the removal from
vgextend. Move the check inside the functions that actually move pvs from
one vg structure to another. Should be no functional change.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
In the future we may export these functions or something like them in liblvm
For now this helps in cleaning up the checks for RESIZEABLE since we can
use the internal library function vg_bad_status_bits.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Move the check for the RESIZEABLE flag inside the vg_extend function.
When we consolidated the vg locking, reading, and status flag checking,
we tied the check for the RESIZEABLE flag to the vg_read() call. The problem
with this is you cannot know what other APIs the application my or may not
call after a vg_read() call. Thus the READ_REQUIRE_RESIZEABLE flag is not
really ideal - ideally we should be checking for this flag on a specific
operation, not inside the vg_read() call. This patch moves one check inside
the library.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
Orphan lock is now obtained second and released first, and all tools
are consistent in this regard.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
With this change we now have vgcreate/vgextend liblvm functions.
Note that this changes the lock order of the following functions as the
orphan lock is now obtained first. With our policy of non-blocking
second locks, this should not be a problem.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Move the vg orphan lock inside vg_remove_single, now a complete liblvm
function. Note that this changes the order of the locks - originally
VG_ORPHAN was obtained first, then the vgname lock. With the current
policy of non-blocking second locks, this could mean we get a failure
obtaining the orphan lock. In the case of a vg with lvs being removed,
this could result in the lvs being removed but not the vg. Such a
scenario could have happened prior though with a different failure.
Other tools were examined for side-effects, and no major problems
were noted.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Move check for active LVs outside of library function. The vgremove
liblvm function function will fail if there are active LVs. It will
be the application's responsibility to check this condition and remove
the LVs individually before calling vgremove. Note also that we've
duplicated the EXPORTED_VG check in vgremove_single (tools) and
vg_remove_single (library). Duplication seemed the only option here
since we don't want to do the automatic removal of LVs (in the tools)
if the vg is exported, and we still need to protect the library call
from removal if the vg is exported.
We still need to deal with the ORPHAN lock but vg_remove_single is now
very close to our liblvm function.
TODO: Refactor lvremove in a similar way.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
vg_t *vg_create(struct cmd_context *cmd, const char *vg_name);
This is the first step towards the API called to create a VG.
Call vg_lock_newname() inside this function. Use _vg_make_handle()
where possible.
Now we have 2 ways to construct a volume group:
1) vg_read: Used when constructing an existing VG from disks
2) vg_create: Used when constructing a new VG
Both of these interfaces obtain a lock, and return a vg_t *.
The usage of _vg_make_handle() inside vg_create() doesn't fit
perfectly but it's ok for now. Needs some cleanup though and I've
noted "FIXME" in the code.
Add the new vg_create() plus vg 'set' functions for non-default
VG parameters in the following tools:
- vgcreate: Fairly straightforward refactoring. We just moved
vg_lock_newname inside vg_create so we check the return via
vg_read_error.
- vgsplit: The refactoring here is a bit more tricky. Originally
we called vg_lock_newname and depending on the error code, we either
read the existing vg or created the new one. Now vg_create()
calls vg_lock_newname, so we first try to create the VG. If this
fails with FAILED_EXIST, we can then do the vg_read. If the
create succeeds, we check the input parameters and set any new
values on the VG.
TODO in future patches:
1. The VG_ORPHAN lock needs some thought. We may want to treat
this as any other VG, and require the application to obtain a handle
and pass it to other API calls (for example, vg_extend). Or,
we may find that hiding the VG_ORPHAN lock inside other APIs is
the way to go. I thought of placing the VG_ORPHAN lock inside
vg_create() and tying it to the vg handle, but was not certain
this was the right approach.
2. Cleanup error paths. Integrate vg_read_error() with vg_create and
vg_read* error codes and/or the new error APIs.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
NOTE: vg_set_alloc_policy() returns success if you try to set a value that
is already stored. The behavior of vgchange is the same though - it fails.
There is a fixme noted in the code about this inconsistency, which should
be resolved if possible.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
In liblvm, we will reserve the word 'change' to mean an API that
both sets one or more values, and commits to disk. This will be
consistent with the LVM commandline. The existing vg_change_pesize()
function does not commit to disk, but just changes the extent_size
and ensures all internal structures are updated. This logic should
be contained in a function that sets the value.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
It would be nice to have one function that does all the validation
and setting of the VG's pesize. However, currently some checks
are in the higher-level function _vgchange_pesize(), and some
checks are in the lower function vg_change_pesize().
This patch moves most of the higher-level checks inside
vg_change_pesize. In one case a failure return code is
changed from ECMD_FAILED to EINVALID_CMD_LINE.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Remove unneeded LOCK_NONBLOCKING from vg_read() API and tools that
use it. We no longer need this flag anywhere since we now automatically
set LCK_NONBLOCK inside lock_vol() if vgs_locked().
For further details, see:
commit d52b3fd3fe
Author: Dave Wysochanski <dwysocha@redhat.com>
Date: Wed May 13 13:02:52 2009 +0000
Remove NON_BLOCKING lock flag from tools and set a policy to auto-set.
As a simplification to the tools and further liblvm, this patch pushes
the setting of NON_BLOCKING lock flag inside the lock_vol() call.
The policy we set is if any existing VGs are currently locked, we
set the NON_BLOCKING flag.
At some point it may make sense to add this flag back if we get an
RFE from a liblvm user, but for now let's keep it as simple as
possible.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Remove LOCK_KEEP and READ_CHECK_EXISTENCE from vgsplit.
These flags are no longer necessary. We now check for existence
in a differnet function, and it is not necessary to keep the lock.
Removing these flags simplifies the new vg_read() interface.
After this patch, we can fully remove LOCK_KEEP.
READ_CHECK_EXISTENCE needs a bit more work before full removal.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Fix vg_read() error paths to properly release upon vg_read_error().
Note that in the iterator paths (process_each_*()), we release
inside the iterator so no individual cleanup is needed. However there
are a number of other places we missed the cleanup. Proper cleanup
when vg_read_error() is true should be calling vg_release(vg), since
there should be no locks held if we get an error (except in certain
special cases, which IMO we should work to remove from the code).
Unfortunately the testsuite is unable to detect these types of memory
leaks. Most of them can be easily seen if you try an operation
(e.g. lvcreate) with a volume group that does not exist. Error
message looks like this:
Volume group "vg2" not found
You have a memory leak (not released memory pool):
[0x1975eb8]
You have a memory leak (not released memory pool):
[0x1975eb8]
Author: Dave Wysochanski <dwysocha@redhat.com>
Sun May 3 13:12:28 CEST 2009 Petr Rockai <me@mornfall.net>
* Convert vgsplit to use vg_read_for_update.
Author: Petr Rockai <prockai@redhat.com>
Committer: Dave Wysochanski <dwysocha@redhat.com>
Sun May 3 12:54:28 CEST 2009 Petr Rockai <me@mornfall.net>
* Convert vgrename to vg_read_for_update.
Rebased 6/26/2009 - Dave W.
Author: Petr Rockai <prockai@redhat.com>
Committer: Dave Wysochanski <dwysocha@redhat.com>
Sun May 3 12:32:30 CEST 2009 Petr Rockai <me@mornfall.net>
* Rework the toollib interface (process_each_*) on top of new vg_read.
Rebased 6/26/09 by Dave W.
- Add skipping message to process_each_lv
- Remove inconsistent_t.
Sun May 3 11:40:51 CEST 2009 Petr Rockai <me@mornfall.net>
* Convert the straight instances of vg_lock_and_read to new vg_read(_for_update).
Rebased 6/26/09 by Dave W.
Sun May 3 11:40:51 CEST 2009 Petr Rockai <me@mornfall.net>
* Convert the straight instances of vg_lock_and_read to new vg_read(_for_update).
Author: Petr Rockai <prockai@redhat.com>
Committer: Dave Wysochanski <dwysocha@redhat.com>
Several commands calls process_each_vg() and in provided
callback it explicitly recovers VG if inconsistent.
(vgchange, vgconvert, vgscan)
It means that old VG is released and reread but the function
above (process_one_vg) tries to unlock and release old VG.
Patch moves the repair logic into _process_one_vg() function.
It always tries to read vg (even inconsistent) and then decides
what to do according new defined parameter.
Also patch unifies inconsistent error messages.
The only slight change if for vgremove command, where
it now tries to repair VG before it removes if force arg is given.
(It works similar way before, just the order of operation changed).
When mirror convert polling is started (mainly as backgound process,
in lvchange -a y or in lvconvert itself) it tries to read VG
and LV identified by its name.
Unfortunatelly, the VG can have already different LV under the same name,
and various more or less funny things can happen (note that
_finish_lvconvert_mirror suspends the volume for example).
(the typical example is our testing script which continuously recreates
LVs under the same name in the same VG.)
This patch adds optional uuid parameter which helps to properly
select the monitoring object. For lvconvert polling it is set to LV UUID
and both _get_lvconvert_vg and _get_lvconvert_lv uses it to read proper VG/LV.
(In the pvmove case it is NULL, here we poll for physical volume name).
pvmove now keep suspended devices if temporary mirror creation fails.
We can try to restore previous state if it is first attempt to activate
pvmove (code basically run the same code as --abort automatically).
We can temporarily violate max_lv during mirror conversion etc.
(If the operation fails, orphan mirror images are visible to administrator
for manual remove for example. Not that this should ever happen:-)
Force limit only for lvcreate (and vg merge) command.
Patch also adds simple max_lv tests into testsuite
The snapshot segment (snapshotX) is created twice
during the text metadata segment processing.
This can cause temporary violation of max_lv count.
Simplify the code, snapshot segment is properly initialized
in init_snapshot_seg function now and do not need to be replaced
by vg_add_snapshot call.
The vg_add_snapshot() is now usefull only for adding new
snapshot and it shares the same initialization function.
The snapshot name is always generated, name paramater can be
removed from function call.
As a simplification to the tools and further liblvm, this patch pushes
the setting of NON_BLOCKING lock flag inside the lock_vol() call.
The policy we set is if any existing VGs are currently locked, we
set the NON_BLOCKING flag.
Should be no functional change.
Buildsystem support device-mapper only install,
but generic install tagret includes both dm+lvm2.
For distribution which uses separate install_device-mapper,
there is no way how to install lvm2 only
(so after installing lvm2 for packaging purposes
built system must remove installed device-mapper files).
Fix it by allowing lvm2_install target, similarily like
install_cluster for clvmd.
(install = install_device-mapper + install_lvm2)
Add lvs origin_size field.
Fix linux configure --enable-debug to exclude -O2.
Still a few rough edges, but hopefully usable now:
lvcreate -s vg1 -L 100M --virtualoriginsize 1T
The backup() call store metadata from memory.
But in cluster backup() call performs
remote nodes metadata backup and it reads data from disk.
For metadata backup consistency,
patch moves all backup() calls after vg_commit.
(Moreover, some tools already do that this way.)
If user requests report attribute from PVSEG type
and PV is orphan (or all devices is set), the report
is empty.
Try for example (when only orphan PV are present)
#pvs
#pvs -o +devices
# pvs /dev/sdb1
PV VG Fmt Attr PSize PFree
/dev/sdb1 lvm2 -- 46.58G 46.58G
# pvs -o +devices /dev/sdb1
(no output)
The problem is caused by empty pv->segments list.
Fix it by providing fake segment here (similar to fake structures
in _pvsegs_sub_single() calls.
# pvs -a -o devices
Volume group name (null) has invalid characters
Skipping volume group (null)
...
_pvsegs_sub_single creates fake vg, we need to check
that pv is real here.
Currently PV commands, which performs full device scan, repeatly
re-reads PVs and scans for all devices.
This behaviour can lead to OOM for large VG.
This patch allows using internal metadata cache for pvs & pvdisplay,
so the commands scan the PVs only once.
(We have to use VG_GLOBAL otherwise cache is invalidated on every
VG unlock in process_single PV call.)
If the vg in process_each_segment_in_pv is NULL, the pv struct
can be incomplete (for example lv_segs are not copied in get_pvs()
call).
We need use the new pv from just read-in volume group.
(The same code is in pvdisplay already.)
In libdm/Makefile.in, we need to cleanup the symlink properly.
Adding to CLEAN_TARGETS seemed like the simplest way to do this
in the current build framework. We could redo dependencies for
VERSIONED_SHLIB, but for now just add to CLEAN_TARGETS.
For scripts/Makefile.in, we should be adding to DISTCLEAN_TARGETS.
The generic rule in make.tmpl.in takes care of the cleanup.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Author: Takahiro Yasui <tyasui@redhat.com>
Patch fixes these problems:
- during the snapshot creation process, it needs create 2 LVs,
one is cow, second becomes snapshot.
If the code fails in vg_add_snapshot, code lvcreate will not remove
LV cow volume.
- if max_lv is set and VG contains snapshot, it can happen that
during the activation lv_count is temporarily increased over the limit
and VG metadata are not properly processed
see https://bugzilla.redhat.com/show_bug.cgi?id=490298
- vgcfgrestore alows restore with max_lv set to lower valuer that actual
LV count. This later leads to situation that max_lv is completely ignored.
- vgck doesn't call vg_validate(). It should at least try:-)
Signed-off-by: Milan Broz <mbroz@redhat.com>
Using argv[] list in exec_cmd() to allow more params for external commands.
Fsadm does not allow checking mounted filesystem.
Fsadm no longer accepts 'any other key' as 'no' answer to y/n.
Fsadm improved handling of command line options.
This patch is not fully tested and leaves some related bugs unfixed.
Intended behaviour of the code now:
pe_start in the lvm2 format PV label header is set only by pvcreate (or
vgconvert -M2) and then preserved in *all* operations thereafter.
In some specialist cases, after the PV is added to a VG, the pe_start
field in the VG metadata may hold a different value and if so, it
overrides the other one for as long as the PV is in such a VG.
Currently, the field storing the size of the data area in the PV label
header always holds 0. As it only has meaning in the context of a
volume group, it is calculated whenever the PV is added to a VG (and can
be derived from extent_size and pe_count in the VG metadata).
When reporting explicitly label attributes (pv_uuid for example), we do not
need to read metadata.
This patch separate the label fileds and removes scan_vgs_for_pvs
in process_each_pv() if not needed.
(There should be no user visible change in output.)
Very simple / crude method of removing 'is_static' from initialization.
Why should we require an application tell us whether it is linked
statically or dynamically to libLVM? If the application is linked
statically, but libraries exist and dlopen() calls succeed, why
do we care if it's statically linked?
This allows us to remove one argument from create_toolcontext() and
moves it closer to a generic library init function.
In the arg_*() functions, we just use _the_args() directly.
For now we leave the first parameter to these
arg_*() functions (struct cmd_context *) because
of the number of files involved in removing the
parameter.
In preparation for removing cmd->args.
IMO, it makes more sense to put these accessor functions
in the same location as the static array _the_args.
Next patch will update arg_* functions to use _the_args[]
directly and remove cmd->args.
Move init_full_scan_done(0) and init_mirror_in_sync(0) from init_lvm()
after call to create_toolcontext() to _init_globals(), called from bottom
of create_toolcontext(). No functional change.
Author: Dave Wysochanski <dwysocha@redhat.com>
Acked-by: James Cameron <james.cameron@hp.com>
Acked-by: Alasdair G Kergon <agk@redhat.com>
init_formats() sets up the command formats, and currently sets cmd->fmt_backup
but does not set cmd->fmt to a default value. This seems incorrect so we
set it to cmd->default_settings.fmt before returning.
The call we remove here may set cmd->fmt based on a command line setting.
But it is safe to remove this, because the only caller of init_lvm() that
cares about the cmdline override is the cmdline tools (clvmd does not care),
called from lvm2_main(). After lvm2_main() calls init_lvm(), it later calls
lvm_run_command(). In lvm_run_command(), we have a call to _apply_settings(),
which has the identical assignment of cmd->fmt that this patch removes.
This is very obvious - _init_logging() makes the identical init_msg_prefix()
and init_cmd_name() calls with cmd->default_settings so these calls are
clearly redundant after calling create_toolcontext().
Very similar argument to removal of init_debug() and other calls.
create_toolcontext() calls _process_config() which sets
cmd->default_settings.activation, then calls
set_activation(cmd->default_settings.activation). Later, create_toolcontext()
sets cmd->current_settings = cmd->default_settings. So these calls
set_activation(cmd->current_settings.activation) are redundant.
Identical argument to previous patch which removed archive_enable() calls.
We add a new parameter to backup_init() which sets the enable value based
on the cmd->default_settings.backup value. This value was used to set
cmd->current_settings.backup, used in the removed backup_enable() call.
_init_backup() calls archive_init(), which originally set 'enabled' to
a hardcoded '1' value. This seems incorrect based on my read of other
areas of the code so here we add a 'enabled' paramter to archive_init().
We pass in cmd->default_settings.archive, which is obtained from the
config tree. Later in create_toolcontext, cmd->current_settings is
set to cmd->default_settings. The archive_enable() call we remove
here was using cmd->current_settings to set the 'archive' enable
value. The final value of cmd->archive_params->enabled should thus
be equivalent to the original code.
This one we actually need to move. _init_logging() is called from
create_toolcontext(), which makes this call:
/* Test mode */
cmd->default_settings.test =
find_config_tree_int(cmd, "global/test", 0);
But it does not call init_test(). So we need an init_test() somewhere.
The most logical place is to put it inside _init_logging(), since this
is where the config value is read and default_settings are set. Placing
the init_test() call here matches what is done with other variables and
seems to make sense.
This variable is set at the top of create_toolcontext() to 0.
Nothing later in create_toolcontext() changes the value.
In init_lvm(), nothing between create_toolcontext() call and this assignment
changes the value. Thus, the assignment is redundant.
The rationale for removing init_verbose() call is very similar to removing
init_debug() call. create_toolcontext() calls _init_logging() which
makes these calls:
/* Verbose level for tty output */
cmd->default_settings.verbose =
find_config_tree_int(cmd, "log/verbose", DEFAULT_VERBOSE);
init_verbose(cmd->default_settings.verbose + VERBOSE_BASE_LEVEL);
And being that create_toolcontext() copies default_settings into
current_settings at the bottom, the init_verbose() call we are removing:
init_verbose(cmd->current_settings.verbose + VERBOSE_BASE_LEVEL);
is redundant.
We can safely remove because create_toolcontext() calls _init_logging(),
which makes these calls:
/* Debug level for log file output */
cmd->default_settings.debug =
find_config_tree_int(cmd, "log/level", DEFAULT_LOGLEVEL);
init_debug(cmd->default_settings.debug);
Then at the bottom of create_toolcontext() we do this:
cmd->current_settings = cmd->default_settings;
So the call we are removing from init_lvm() functions (clvmd and lvmcmdline):
init_debug(cmd->current_settings.debug);
Just sets the value of debug based on 'cmd->current_settings.debug'.
Since cmd->current_settings is equivalent to cmd->default_settings, and
init_debug() was called with cmd->default_settings, the call we remove is
redundant.
with the second vgcreate overwriting the first.
Obtain lock before calling vg_create(), which checks for existence of vgname
and fails if it already exists.
Prior to this patch, "lvremove -f vgname" would fail if vgname contained
one or more snapshot LVs. Now this passes, but has a side-effect.
If you issue "lvremove vgname" where vgname contains one or more snaps,
you will get an extra "y/n" prompt to remove the same snapshot.
Example:
$ lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
lvsnap vgtest swi-a- 16.00M lvtest 0.05
lvtest vgtest owi-a- 64.00M
$ lvremove vgtest
Do you really want to remove active logical volume "lvsnap"? [y/n]: n
Logical volume "lvsnap" not removed
Do you really want to remove active logical volume "lvsnap"? [y/n]: n
Logical volume "lvsnap" not removed
Command failed with status code 5.
Fixing this will most likely require modification of the iterator
function, process_each_lvs_in_vg() to iterate over snaps in some
cases (e.g. lvs, vgdisplay -v) but not in others (lvremove).
If the PV has two metadata areas, second one is located at the end of the device.
Do not allow resize of PV or second metadata area can be overwritten.
(The check was active only for orphan PVs.)
Fixes problem when after downconvert to lvm1 VG is broken:
# lvcreate -n lv1 -l 4 vg_test
Invalid LV in extent map (PV /dev/sdb1, PE 0, LV 0, LE 0)
...
