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Dedicated functions are now used to process each piece of data obtained,
so the refactoring in this file gives us one for the vgsummary and one
for the metadata header. This new type of function takes two parameters
(for now), the obtained data plus a single struct (that must not
reference any data on the stack) that wraps up the entire context needed
to process it.
Sleep a bit before checking /sys/block dir so the kernel has a moment to
actually put scsi debug device in it...
Some quite old kernels are in troubles with this plain searching grep
without sleep (namely 2.6.32)
modprobe scsi_debug
<sleep .1>
grep -H scsi_debug /sys/block/*/device/model
modprobe -r scsi_debug
Rename dev_read() to dev_read_buf() - the function that reads data
into a supplied buffer.
Introduce a new dev_read() that allocates the buffer it returns and
switch the important users over to this. No caller may change the
returned data. (For now, callers are responsible for freeing it after
use, but later the device layer will take full ownership.)
dev_read_buf() should only be used for tiny buffers or unimportant code
(such as the old disk formats).
The creation of wrapped around metadata - where the start of metadata is
written up to the end of the buffer and the remainder follows back at
the start of the buffer - is now restricted to cases where writing the
metadata in one piece wouldn't fit. This shouldn't happen in 'normal'
usage so let's begin treating the code for this as a special case that
can be ignored when optimising 'normal' cases.
Add three new raid tests with io load and table
reloads during reshape for target 1.13.2.
Add a raid0 to raid10 conversion test.
Also add more signals to trap in lvconvert-raid-reshape-load.sh.
If there is sufficient space in the metadata area, align the next
metadata to a disk offset that is a multiple of 4096 bytes and
don't write it circularly. If it doesn't all fit at the end
of the metadata area, go back to the start and write it all there
contiguously.
If there is insufficient space to use the new stricter rules, revert to
the original behaviour, aligning on 512-byte boundaries wrapping around
the circular buffer as required.
Even after writing some metadata encountered problems, some commands
continue (rightly or wrongly) and attempt to make further changes.
Once an mda is marked MDA_FAILED, don't try to use it again.
This also applies when reverting, where one loop already skips
failed mdas but the other doesn't.
This fixes some device open_count warnings on relevant failure paths.
lvmdbusd was started, but the process was not recognized by pgrep.
- configure does not make the script executable - set the flag
explicitly when running make check,
- process name changed to lvmdbusd. The previous python3 value
originated from the use of /usr/bin/env.
Use new ALIGN_ABSOLUTE macro when calculating the start location
of new metadata and adjust the end of buffer detection so that
there is no longer an imposed gap between old and new metadata.
Currently both start and offset should always be divisible by alignment,
so this should have no effect, but a later patch will increase alignment
so these variables can no longer be optimised out.
lvmdbusd executable script must use python3 interpreter detected by
configure script, as site-packages directory used for library is only
used by that interpreter.
Although it doesn't look like it can be a measurable problem
and costs some time to flip priorities outside of activation window.
So just like with memory locking preserve priority until call
memlock_unlock() appears.
(addition to commit c086dfadc3).
