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| author |   Christoph Hellwig <hch@lst.de> | 2017-06-03 09:38:04 +0200 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2017-06-09 09:27:32 -0600 |
| commit | 2a842acab109f40f0d7d10b38e9ca88390628996 (patch) | |
| tree | bdfc7a47fe655c2ea7a5f74127015d7a502042f0 /arch/s390/include/asm/eadm.h | |
| parent | dm: change ->end_io calling convention (diff) | |
| download | linux-dev-2a842acab109f40f0d7d10b38e9ca88390628996.tar.xz linux-dev-2a842acab109f40f0d7d10b38e9ca88390628996.zip | |
block: introduce new block status code type
Currently we use nornal Linux errno values in the block layer, and while
we accept any error a few have overloaded magic meanings. This patch
instead introduces a new blk_status_t value that holds block layer specific
status codes and explicitly explains their meaning. Helpers to convert from
and to the previous special meanings are provided for now, but I suspect
we want to get rid of them in the long run - those drivers that have a
errno input (e.g. networking) usually get errnos that don't know about
the special block layer overloads, and similarly returning them to userspace
will usually return somethings that strictly speaking isn't correct
for file system operations, but that's left as an exercise for later.
For now the set of errors is a very limited set that closely corresponds
to the previous overloaded errno values, but there is some low hanging
fruite to improve it.
blk_status_t (ab)uses the sparse __bitwise annotations to allow for sparse
typechecking, so that we can easily catch places passing the wrong values.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'arch/s390/include/asm/eadm.h')
| -rw-r--r-- | arch/s390/include/asm/eadm.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/s390/include/asm/eadm.h b/arch/s390/include/asm/eadm.h index 67026300c88e..144809a3f4f6 100644 --- a/arch/s390/include/asm/eadm.h +++ b/arch/s390/include/asm/eadm.h @@ -3,6 +3,7 @@ #include <linux/types.h> #include <linux/device.h> +#include <linux/blkdev.h> struct arqb { u64 data; @@ -105,13 +106,14 @@ struct scm_driver { int (*probe) (struct scm_device *scmdev); int (*remove) (struct scm_device *scmdev); void (*notify) (struct scm_device *scmdev, enum scm_event event); - void (*handler) (struct scm_device *scmdev, void *data, int error); + void (*handler) (struct scm_device *scmdev, void *data, + blk_status_t error); }; int scm_driver_register(struct scm_driver *scmdrv); void scm_driver_unregister(struct scm_driver *scmdrv); int eadm_start_aob(struct aob *aob); -void scm_irq_handler(struct aob *aob, int error); +void scm_irq_handler(struct aob *aob, blk_status_t error); #endif /* _ASM_S390_EADM_H */ |