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23 October 2021, 00:29:24 UTC
Revision cd02dca56442e1504fd6bc5b96f7f1870162b266 authored by Chris Mason on 13 December 2010, 19:56:23 UTC, committed by Chris Mason on 14 December 2010, 01:06:52 UTC 
Btrfs: account for missing devices in RAID allocation profiles
 
When we mount in RAID degraded mode without adding a new device to
replace the failed one, we can end up using the wrong RAID flags for
allocations.

This results in strange combinations of block groups (raid1 in a raid10
filesystem) and corruptions when we try to allocate blocks from single
spindle chunks on drives that are actually missing.

The first device has two small 4MB chunks in it that mkfs creates and
these are usually unused in a raid1 or raid10 setup.  But, in -o degraded,
the allocator will fall back to these because the mask of desired raid groups
isn't correct.

The fix here is to count the missing devices as we build up the list
of devices in the system.  This count is used when picking the
raid level to make sure we continue using the same levels that were
in place before we lost a drive.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
1 parent 68433b7
History
Tip revision: cd02dca56442e1504fd6bc5b96f7f1870162b266 authored by Chris Mason on 13 December 2010, 19:56:23 UTC
Btrfs: account for missing devices in RAID allocation profiles
Tip revision: cd02dca
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