Commit 373282e7 authored by John Pittman's avatar John Pittman Committed by Jens Axboe

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: default avatarBart Van Assche <bvanassche@acm.org>
Signed-off-by: default avatarJohn Pittman <jpittman@redhat.com>

Added null_blk prefix to error message.
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent bb351aba
...@@ -88,7 +88,8 @@ shared_tags=[0/1]: Default: 0 ...@@ -88,7 +88,8 @@ shared_tags=[0/1]: Default: 0
zoned=[0/1]: Default: 0 zoned=[0/1]: Default: 0
0: Block device is exposed as a random-access block device. 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 zone_size=[MB]: Default: 256
Per zone size when exposed as a zoned block device. Must be a power of two. Per zone size when exposed as a zoned block device. Must be a power of two.
...@@ -97,6 +97,7 @@ void null_zone_reset(struct nullb_cmd *cmd, sector_t sector); ...@@ -97,6 +97,7 @@ void null_zone_reset(struct nullb_cmd *cmd, sector_t sector);
#else #else
static inline int null_zone_init(struct nullb_device *dev) static inline int null_zone_init(struct nullb_device *dev)
{ {
pr_err("null_blk: CONFIG_BLK_DEV_ZONED not enabled\n");
return -EINVAL; return -EINVAL;
} }
static inline void null_zone_exit(struct nullb_device *dev) {} static inline void null_zone_exit(struct nullb_device *dev) {}
......
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