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Release SCL_STATE in map_write_done()

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The config lock must be held for the duration of the MMP write.
Since the I/Os are executed via map_nowait(), the done function
is the only place where we know the write has completed.

Since SCL_STATE is taken as reader, overlapping I/Os do not
create a deadlock.  The refcount is simply increased when new
I/Os are queued and decreased when I/Os complete.

Test case added which exercises the probe IO call path to
verify the fix and prevent a regression.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Closes #6394
This commit is contained in:
Olaf Faaland
2017-07-24 08:48:28 -07:00
committed by Brian Behlendorf
parent f43615d0cc
commit ffb195c256
4 changed files with 69 additions and 6 deletions
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tests/runfiles/linux.run
+2 -1
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@@ -412,7 +412,8 @@ tests = ['mmap_write_001_pos', 'mmap_read_001_pos']
[tests/functional/mmp]
tests = ['mmp_on_thread', 'mmp_on_uberblocks', 'mmp_on_off', 'mmp_interval',
'mmp_active_import', 'mmp_inactive_import', 'mmp_exported_import']
'mmp_active_import', 'mmp_inactive_import', 'mmp_exported_import',
'mmp_write_uberblocks']
[tests/functional/mount]
tests = ['umount_001', 'umountall_001']