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The changes to remove LCK_NONBLOCK from the LVM locks broke clvmd because the
code was clearly wrong but working anyway! The constant was being masked rather
than the variable that was supposed to match against it.
Rename private _primary_dev() to a public get_primary_dev() and reuse it
to allow retrieval of the MD sysfs attributes (raid level, etc) for MD
partitions.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Improve lib/device/device.c:_primary_dev()'s ability to look up the
primary device associated with all partitions; including blkext
(e.g. partitions directly on MD). The same will also work for obscure
sysfs paths; e.g.: paths with mangled names like the HP cciss driver
uses: /sys/block/cciss!c0d0/cciss!c0d0p1/
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Adds 'data_alignment_detection' config option to the devices section of
lvm.conf. If your kernel provides topology information in sysfs (linux
>= 2.6.31) for the Physical Volume, the start of data area will be
aligned on a multiple of the ’minimum_io_size’ or ’optimal_io_size’
exposed in sysfs.
minimum_io_size is used if optimal_io_size is undefined (0). If both
md_chunk_alignment and data_alignment_detection are enabled the result
of data_alignment_detection is used.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
If the pvcreate --dataalignmentoffset option is not specified the start
of a PV's aligned data area will be shifted by the associated
'alignment_offset' exposed in sysfs (unless
devices/data_alignment_offset_detection is disabled in lvm.conf).
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Documented which use-cases force the reinstatement of the nuanced
handling of pe_start. As soon as orphan PVs are eliminated much of this
will no longer be a concern ('preserve_pe_start' can be reenabled in
.pv_setup).
Added defensive 'if (pv->pe_align)' check in _text_pv_write()'s pe_start
loop.
If pv_setup was given a non-zero pe_start it would short-circuit
establishing a default pv->pe_align. pv->pe_align=0 would result
in a divide by zero in _mda_setup(). 'vgconvert -M2 $vgname' hit this.
.pv_write still properly preserves pe_start if it was supplied.
