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New versions of kvdo module exposes statistics at new location:
/sys/block/dm-XXX/vdo/statistics/...
Enhance lvm2 to access this location first.
Also if the statistic info is missing - make it 'debug' level info,
so it is not failing 'lvs' command.
Do not call 'dmsetup info' for non-dm devices.
Better handling for VGNAME and LVNAME - so when convering LV as
backend device automatically recognize it and reuse LV name for VDOLV.
Add prompt for final confirmation before actual conversion is started
(once confirmed, lvm2 commands no longer prompts to avoid leaving
conversion in the middle of its process.)
Compilation needs to generate 'C' locale sorted command file
definitions. To always enforce 'C' sorting rules user LC_ALL
instead of LANG, as LANG settings can be overuled by
other LC settings like LC_COLLATE and may result into miscompiled
lvm2 binary if locales ordering differs from 'C'.
Reported-by: jmp-lvm2@ookaze.fr
Since VDO is always returns 'zero' on unprovisioned read
and every provisioned block is always 'zeroed' on partial writes,
we can avoid 'zeroing' of such LVs.
Some device id types can only be used with specific device major
numbers, so use this restriction to avoid some comparisions.
This is more efficient, and can avoid some incorrect matches.
pvid and vgid are sometimes a null-terminated string, and
other times a 'struct id', and the two types were often
cast between each other. When a struct id was cast to a char
pointer, the resulting string would not necessarily be null
terminated. Casting a null-terminated string id to a
struct id is fine, but is still avoided when possible.
A struct id is: int8_t uuid[ID_LEN]
A string id is: char pvid[ID_LEN + 1]
A convention is introduced to help distinguish them:
- variables and struct fields named "pvid" or "vgid"
should be null-terminated strings.
- variables and struct fields named "pv_id" or "vg_id"
should be struct id's.
- examples:
char pvid[ID_LEN + 1];
char vgid[ID_LEN + 1];
struct id pv_id;
struct id vg_id;
Function names also attempt to follow this convention.
Avoid casting between the two types as much as possible,
with limited exceptions when known to be safe and clearly
commented.
Avoid using variations of strcpy and strcmp, and instead
use memcpy/memcmp with ID_LEN (with similar limited
exceptions possible.)
- Use a new function for all instances of copying
a null-terminated string into a fixed size struct
field that is not null-terminated.
- use memcpy when copying between struct fields of
the same size
When multiple lvchange refresh processes executed at the same time,
suspend/resume ioctl on the same dm, some of these commands will be failed
for dm aready change status, and ioctl will return EINVAL in _do_dm_ioctl function.
to avoid this problem, add READ_FOR_ACTIVATE flags in lvchange refresh process,
it will hold LCK_WRITE lock and avoid suspend/resume dm at the same time.
Signed-off-by: Long YunJian <long.yunjian@zte.com.cn>
Signed-off-by: Yi Wang <wang.yi59@zte.com.cn>
