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authorJohn Pittman <jpittman@redhat.com>2019-01-04 12:06:37 -0500
committerJens Axboe <axboe@kernel.dk>2019-01-06 10:58:27 -0700
commit373282e7ab6840cd583a223fa90628f2d8293c26 (patch)
tree390a7a5aae203ed6475f3fc51f21700d7341a148 /Documentation/block
parentbb351abaf5cd4f9237e1b3094d9cc04853de6d95 (diff)
null_blk: add zoned config support information
If the kernel is built without CONFIG_BLK_DEV_ZONED, a modprobe of the null_blk driver with zoned=1 fails with 'Invalid argument'. This can be confusing to users, prompting a search as to why the parameter is invalid. To assist in that search, add a bit more information to the failure, additionally adding to the documentation that CONFIG_BLK_DEV_ZONED is needed for zoned=1. Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: John Pittman <jpittman@redhat.com> Added null_blk prefix to error message. Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'Documentation/block')
-rw-r--r--Documentation/block/null_blk.txt3
1 files changed, 2 insertions, 1 deletions
diff --git a/Documentation/block/null_blk.txt b/Documentation/block/null_blk.txt
index ea2dafe49ae8..4cad1024fff7 100644
--- a/Documentation/block/null_blk.txt
+++ b/Documentation/block/null_blk.txt
@@ -88,7 +88,8 @@ shared_tags=[0/1]: Default: 0
zoned=[0/1]: Default: 0
0: Block device is exposed as a random-access block device.
- 1: Block device is exposed as a host-managed zoned block device.
+ 1: Block device is exposed as a host-managed zoned block device. Requires
+ CONFIG_BLK_DEV_ZONED.
zone_size=[MB]: Default: 256
Per zone size when exposed as a zoned block device. Must be a power of two.