dm cache metadata: fix READ_LOCK macros and cleanup WRITE_LOCK macros

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commit 9567366fef upstream.

The READ_LOCK macro was incorrectly returning -EINVAL if
dm_bm_is_read_only() was true -- it will always be true once the cache
metadata transitions to read-only by dm_cache_metadata_set_read_only().

Wrap READ_LOCK and WRITE_LOCK multi-statement macros in do {} while(0).
Also, all accesses of the 'cmd' argument passed to these related macros
are now encapsulated in parenthesis.

A follow-up patch can be developed to eliminate the use of macros in
favor of pure C code.  Avoiding that now given that this needs to apply
to stable@.

Reported-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Fixes: d14fcf3dd7 ("dm cache: make sure every metadata function checks fail_io")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Mike Snitzer 2016-04-12 12:14:46 -04:00 • committed by Greg Kroah-Hartman

parent e4c7ab7658

commit 9d58f322ee

1 changed files with 40 additions and 24 deletions

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drivers/md/dm-cache-metadata.c

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