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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
When building lvm2 in Gentoo/ChromeOS with the ASAN memory
sanitizer enabled, man-generator fails with the following
error. Initializing makes the error go away.
* SUMMARY: MemorySanitizer: use-of-uninitialized-value /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3316:6 in _include_description_file
* Exiting
* ASAN error detected:
* ==2548047==WARNING: MemorySanitizer: use-of-uninitialized-value
* #0 0x558b00ab4730 in _include_description_file /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3316:6
* #1 0x558b00ab4730 in _print_man /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3426:21
* #2 0x558b00ab4730 in main /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3570:7
* #0 0x7fa9b2cbb807 in find_derivation /var/tmp/portage/cross-x86_64-cros-linux-gnu/glibc-2.33-r8/work/glibc-2.33/iconv/gconv_db.c:583:15
* #1 0x558b00a29559 in ?? ??:0
*
* Uninitialized value was created by an allocation of 'statbuf.i.i' in the stack frame of function 'main'
* #0 0x558b00ab1d4d in main /build/amd64-generic/tmp/portage/sys-fs/lvm2-2.02.187-r3/work/LVM2.2.02.187/tools/man-generator.c:3505
expands commit d5a06f9a7d
"pvscan: skip indexing devices used by LVs"
The dev cache index is expensive and slow, so limit it
to commands that are used to observe the state of lvm.
The index is only used to print warnings about incorrect
device use by active LVs, e.g. if an LV is using a
multipath component device instead of the multipath
device. Commands that continue to use the index and
print the warnings:
fullreport, lvmdiskscan, vgs, lvs, pvs,
vgdisplay, lvdisplay, pvdisplay,
vgscan, lvscan, pvscan (excluding --cache)
A couple other commands were borrowing the DEV_USED_FOR_LV
flag to just check if a device was actively in use by LVs.
These are converted to the new dev_is_used_by_active_lv().
If a cmd def implies an LV type without --type
in the required options, then include the implied
type in the cmd def as AUTOTYPE: <type>
instead of including the redundant --type foo
in the OO list of options.
Including an implied --type in the OO list would
often cause multiple cmd defs to potentially be
identical when options were used, and a user
command could match more than one cmd def.
The AUTOTYPE values are listed in man page and
help output as
[ --type foo (implied) ]
If a user command includes --type, it will usually
match a cmd def with --type in the required options.
But, if the user command matches a cmd def with
AUTOTYPE, then the specifed --type and AUTOTYPE must
match.
The man-generator program has a new --check
option that compares cmd defs to find any cmd defs
that are equivalent with the use of options,
and should have their options adjusted.
Compares cmd defs based on two principles for avoiding repeated
commands (where a given command could match more than one cmd def):
. a cmd def should be a unique combination of required
option args and position args
. avoid adding optional options to a cmd def that if
used would make the command match a different cmd def
FIXME: record when repeated cmd defs are found so we can
avoid reporting them twice, e.g. once for A vs B and
second time for B vs A.
Emit .ad l / .ad b less frequently around larger blocks
we want to keep left aligned.
Avoid emittting empty lines.
Reduce .HP usage and replace it with .TP.
However keep .HP for all option listings, as i.e. html rendering
can't handle well combintion of .TP an .HP together and .TP alone
is not indenting 2nd. line of long option line.
(For .TP line we don't need to emit .br)
Surround .SH with dots for better look.
For some .TP use plain more readable .I for a line.
Support rendering of optional [Number] (for --units).
Use better markup for units and instead of long markup string,
show individual units with markup.
Enhance man typography decoration of optional option
prefixes like --[raid]writebeind and use regular font to render []
as these are not part of the option name itself.
Previously, accepted LV types were presented as a series of suffixes
after the "LV" on the command line. The addition of many new types
resulted in this becoming too long, e.g
lvconvert --type cache --cachepool LV LV_linear_striped_thinpool_vdo_vdopool_vdopooldata_raid
For man pages, move these types from the command line to a new line
dedicated to listing accepted LV types:
lvconvert --type cache --cachepool LV LV1
...
LV1 types: linear striped thinpool vdo vdopool vdopooldata raid
The special "LV1" is used as a reference to avoid confusion
with other LVs that may appear on the command line. There
are currently no commands with more than one typed LV, but
if there are cases with more, then "LV2" could also be used.
For command line usage/-h output, drop the LV types from the
command line specification. The more detailed is not needed
in the help output and can be found in the man page.
It would be complicated to handle ',' alignment after hyphenation
changes ATM, but these commas seems to be there rather unneeded
so remove them and make the man output more clear.
Disable hyphenation around longer option lists (>42 chars)
and use \: to markup places for line splits.
The code ATM is somewhat mixtured so it's not easy to encapsulate
section .nh ... .hy.
ATM global _was_hyphen is used to properly finish sections after
disabled hyphenation.
Since 'kilobytes' could be seen in 2 way - SI as '1000',
while all programmers sees it as '1024' - switch to
commonly acceptted KiB, MiB....
Resolves RHBZ 1496255.
To create a new cache or writecache LV with a single command:
lvcreate --type cache|writecache
-n Name -L Size --cachedevice PVfast VG [PVslow ...]
- A new main linear|striped LV is created as usual, using the
specified -n Name and -L Size, and using the optionally
specified PVslow devices.
- Then, a new cachevol LV is created internally, using PVfast
specified by the cachedevice option.
- Then, the cachevol is attached to the main LV, converting the
main LV to type cache|writecache.
Include --cachesize Size to specify the size of cache|writecache
to create from the specified --cachedevice PVs, otherwise the
entire cachedevice PV is used. The --cachedevice option can be
repeated to create the cache from multiple devices, or the
cachedevice option can contain a tag name specifying a set of PVs
to allocate the cache from.
To create a new cache or writecache LV with a single command
using an existing cachevol LV:
lvcreate --type cache|writecache
-n Name -L Size --cachevol LVfast VG [PVslow ...]
- A new main linear|striped LV is created as usual, using the
specified -n Name and -L Size, and using the optionally
specified PVslow devices.
- Then, the cachevol LVfast is attached to the main LV, converting
the main LV to type cache|writecache.
In cases where more advanced types (for the main LV or cachevol LV)
are needed, they should be created independently and then combined
with lvconvert.
Example
-------
user creates a new VG with one slow device and one fast device:
$ vgcreate vg /dev/slow1 /dev/fast1
user creates a new 8G main LV on /dev/slow1 that uses all of
/dev/fast1 as a writecache:
$ lvcreate --type writecache --cachedevice /dev/fast1
-n main -L 8G vg /dev/slow1
Example
-------
user creates a new VG with two slow devs and two fast devs:
$ vgcreate vg /dev/slow1 /dev/slow2 /dev/fast1 /dev/fast2
user creates a new 8G main LV on /dev/slow1 and /dev/slow2
that uses all of /dev/fast1 and /dev/fast2 as a writecache:
$ lvcreate --type writecache --cachedevice /dev/fast1 --cachedevice /dev/fast2
-n main -L 8G vg /dev/slow1 /dev/slow2
Example
-------
A user has several slow devices and several fast devices in their VG,
the slow devs have tag @slow, the fast devs have tag @fast.
user creates a new 8G main LV on the slow devs with a
2G writecache on the fast devs:
$ lvcreate --type writecache -n main -L 8G
--cachedevice @fast --cachesize 2G vg @slow
To write a new/repaired pv_header and label_header:
pvck --repairtype pv_header --file <file> <device>
This uses the metadata input file to find the PV UUID,
device size, and data offset.
To write new/repaired metadata text and mda_header:
pvck --repairtype metadata --file <file> <device>
This requires a good pv_header which points to one or two
metadata areas. Any metadata areas referenced by the
pv_header are updated with the specified metadata and
a new mda_header. "--settings mda_num=1|2" can be used
to select one mda to repair.
To combine all header and metadata repairs:
pvck --repair --file <file> <device>
It's best to use a raw metadata file as input, that was
extracted from another PV in the same VG (or from another
metadata area on the same PV.) pvck will also accept a
metadata backup file, but that will produce metadata that
is not identical to other metadata copies on other PVs
and other areas. So, when using a backup file, consider
using it to update metadata on all PVs/areas.
To get a raw metadata file to use for the repair, see
pvck --dump metadata|metadata_search.
List all instances of metadata from the metadata area:
pvck --dump metadata_search <device>
Save one instance of metadata at the given offset to
the specified file (this file can be used for repair):
pvck --dump metadata_search --file <file>
--settings "metadata_offset=<off>" <device>
The exported VG checking/enforcement was scattered and
inconsistent. This centralizes it and makes it consistent,
following the existing approach for foreign and shared
VGs/PVs, which are very similar to exported VGs/PVs.
The access policy that now applies to foreign/shared/exported
VGs/PVs, is that if a foreign/shared/exported VG/PV is named
on the command line (i.e. explicitly requested by the user),
and the command is not permitted to operate on it because it
is foreign/shared/exported, then an access error is reported
and the command exits with an error. But, if the command is
processing all VGs/PVs, and happens to come across a
foreign/shared/exported VG/PV (that is not explicitly named on
the command line), then the command silently skips it and does
not produce an error.
A command using tags or --select handles inaccessible VGs/PVs
the same way as a command processing all VGs/PVs, and will
not report/return errors if these inaccessible VGs/PVs exist.
The new policy fixes the exit codes on a somewhat random set of
commands that previously exited with an error if they were
looking at all VGs/PVs and an exported VG existed on the system.
There should be no change to which commands are allowed/disallowed
on exported VGs/PVs.
Certain LV commands (lvs/lvdisplay/lvscan) would previously not
display LVs from an exported VG (for unknown reasons). This has
not changed. The lvm fullreport command would previously report
info about an exported VG but not about the LVs in it. This
has changed to include all info from the exported VG.
The man page generation for pvchange/lvchange/vgchange was
incorrect (leaving out some option listings) as a result of
commit e225bf5 "fix command definition for pvchange -a"
The -a was being included in the set of "one or more"
options instead of an actual required option. Even
though the cmd def was not implementing the restrictions
correctly, the command internally was.
Adjust the cmd def code which did not support a command
with some real required options and a set of "one or more"
options.
Save the list of PVs in /run/lvm/hints. These hints
are used to reduce scanning in a number of commands
to only the PVs on the system, or only the PVs in a
requested VG (rather than all devices on the system.)
Native disk scanning is now both reduced and
async/parallel, which makes it comparable in
performance (and often faster) when compared
to lvm using lvmetad.
Autoactivation now uses local temp files to record
online PVs, and no longer requires lvmetad.
There should be no apparent command-level change
in behavior.
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 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.
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().
Commits a29bb6a14b
... 5c199d99f4
narrowed down on addressing the escaping of hyphens
in the dynamic creation of manuals whilst avoiding
them in creating help texts. This lead to a sequence
of slipping through hyphens adrressed by additional
patches in aforementioned commit series.
On the other hand, postprocessing dynamically man-generator
created and statically provided manuals catches all hyphens
in need of escaping.
Changes:
- revert the above commits whilst keeping man-generator
streamlining and the detection of any '\' when generating
help texts in order to avoid escapes to slip in
- Dynamically escape hyphens in manaual pages using sed(1)
in the respective Makefile targets
- remove any manually added escaping on hyphens from any
static manual sources or headers
As was recently done with relative signes for sizes/extents,
limit the signs used with the mirrors option, e.g.
lvcreate --mirrors now does not accept or advertise an
optional minus sign with the value. lvconvert --mirrors
accepts +|-.
OO_LVCREATE_CACHE accepts --cachemetadataformat.
Support new option --cachemetadataformat auto|1|2 for caching.
Word 'auto' can be also be given as '0'.
Add new values for different sign variations, resulting in:
size_VAL no sign accepted
ssize_VAL accepts + or -
psize_VAL accepts +
nsize_VAL accpets -
extents_VAL no sign accepted
sextents_VAL accepts + or -
pextents_VAL accepts +
nextents_VAL accepts -
Depending on the command being run, change the option
values for --size, --extents, --poolmetadatasize to
use the appropriate value from above.
lvcreate uses no sign (but accepts + and ignores it).
lvresize accepts +|- for a relative change.
lvextend accepts + for a relative change.
lvreduce accepts - for a relative change.
Like opt and val arrays in previous commit, combine duplicate
arrays for lv types and props in command.c and lvmcmdline.c.
Also move the command_names array to be defined in command.c
so it's consistent with the others.
command.c and lvmcmdline.c each had a full array defining
all options and values. This duplication was not removed
when the command.c code was merged into the run time.
Part of the UNIT description was still living in the
--size description. Move it to the Size[UNIT] description
since it is used by other options, not just --size.
In lvcreate/lvconvert, --poolmetdatasize can only be an
absolute value, but in lvresize/lvextend, --poolmetadatasize
can be given a + relative value.
The val types only currently support relative values that
go in both directions +|-. Further work is needed to add
val types that can be relative in only one direction, and
switching various option values to one those depending on
the command name. Then poolmetdatasize will not appear
with a +|- option in lvcreate/lvconvert, and will
appear with only the + option in lvresize/lvextend.
Clean up and correct the details around --extents and --size.
lvcreate/lvresize/lvreduce/lvextend all now display the
extents option in usages.
The Size and Number value variables for --size and --extents
are now displayed without the [+|-] prefix for lvcreate.
