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| author | John Pittman <jpittman@redhat.com> | 2019-01-04 18:06:37 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2019-01-06 18:58:27 +0100 |
| commit | 373282e7ab6840cd583a223fa90628f2d8293c26 (patch) | |
| tree | 390a7a5aae203ed6475f3fc51f21700d7341a148 | |
| parent | block: add documentation for io_timeout (diff) | |
| download | linux-373282e7ab6840cd583a223fa90628f2d8293c26.tar.xz linux-373282e7ab6840cd583a223fa90628f2d8293c26.zip | |
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>
| -rw-r--r-- | Documentation/block/null_blk.txt | 3 | ||||
| -rw-r--r-- | drivers/block/null_blk.h | 1 |
2 files changed, 3 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. diff --git a/drivers/block/null_blk.h b/drivers/block/null_blk.h index b3df2793e7cd..34b22d6523ba 100644 --- a/drivers/block/null_blk.h +++ b/drivers/block/null_blk.h @@ -97,6 +97,7 @@ void null_zone_reset(struct nullb_cmd *cmd, sector_t sector); #else static inline int null_zone_init(struct nullb_device *dev) { + pr_err("null_blk: CONFIG_BLK_DEV_ZONED not enabled\n"); return -EINVAL; } static inline void null_zone_exit(struct nullb_device *dev) {} |