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authorBrian Behlendorf <[email protected]>2013-01-28 14:15:39 -0800
committerBrian Behlendorf <[email protected]>2013-01-28 15:35:00 -0800
commit2b7ab9d4d9b307c354795e2805ff313ddd01985d (patch)
treed58656a05ce0968b6d931bc36b0ef7bdaeb5c0ca /include
parent930b6fec210d828cb3755f8756dbbbf3001cccae (diff)
Linux 2.6.26 compat, lookup_bdev()
It's doubtful many people were impacted by this but commit 6c28567 accidentally broke ZFS builds for 2.6.26 and earlier kernels. This commit depends on the lookup_bdev() function which exists in 2.6.26 but wasn't exported until 2.6.27. The availability of the function isn't critical so a wrapper is introduced which returns ERR_PTR(-ENOTSUP) when the function isn't defined. This will have the effect of causing zvol_is_zvol() to always fail for 2.6.26 kernels. This in turn means vdevs will always get opened concurrently which is good for normal usage. This will only become an issue if your using a zvol as a vdev in another pool. In which case you really should be using a newer kernel anyway. Signed-off-by: Brian Behlendorf <[email protected]> Closes #1205
Diffstat (limited to 'include')
-rw-r--r--include/linux/blkdev_compat.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/blkdev_compat.h b/include/linux/blkdev_compat.h
index 1ff8eeaf3..9d3e6f07c 100644
--- a/include/linux/blkdev_compat.h
+++ b/include/linux/blkdev_compat.h
@@ -393,6 +393,15 @@ bio_set_flags_failfast(struct block_device *bdev, int *flags)
#endif /* HAVE_1ARG_INVALIDATE_BDEV */
/*
+ * 2.6.27 API change
+ * The function was exported for use, prior to this it existed by the
+ * symbol was not exported.
+ */
+#ifndef HAVE_LOOKUP_BDEV
+# define lookup_bdev(path) ERR_PTR(-ENOTSUP)
+#endif
+
+/*
* 2.6.30 API change
* To ensure good performance preferentially use the physical block size
* for proper alignment. The physical size is supposed to be the internal