提交 e47bc4ed 编写于 作者: C Chaitanya Kulkarni 提交者: Jens Axboe

block: add centralize REQ_OP_XXX to string helper

In order to centralize the REQ_OP_XXX to string conversion which can be
used in the block layer and different places in the kernel like f2fs,
this patch adds a new helper function along with an array similar to the
one present in the blk-mq-debugfs.c.

We keep this helper functionality centralize under blk-core.c instead of
blk-mq-debugfs.c since blk-core.c is configured using CONFIG_BLOCK and
it will not be dependent on blk-mq-debugfs.c which is configured using
CONFIG_BLK_DEBUG_FS.

Next patch adjusts the code in the blk-mq-debugfs.c with newly
introduced helper.
Reviewed-by: NBart Van Assche <bvanassche@acm.org>
Signed-off-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: NJens Axboe <axboe@kernel.dk>
上级 178cc590
...@@ -120,6 +120,42 @@ void blk_rq_init(struct request_queue *q, struct request *rq) ...@@ -120,6 +120,42 @@ void blk_rq_init(struct request_queue *q, struct request *rq)
} }
EXPORT_SYMBOL(blk_rq_init); EXPORT_SYMBOL(blk_rq_init);
#define REQ_OP_NAME(name) [REQ_OP_##name] = #name
static const char *const blk_op_name[] = {
REQ_OP_NAME(READ),
REQ_OP_NAME(WRITE),
REQ_OP_NAME(FLUSH),
REQ_OP_NAME(DISCARD),
REQ_OP_NAME(SECURE_ERASE),
REQ_OP_NAME(ZONE_RESET),
REQ_OP_NAME(WRITE_SAME),
REQ_OP_NAME(WRITE_ZEROES),
REQ_OP_NAME(SCSI_IN),
REQ_OP_NAME(SCSI_OUT),
REQ_OP_NAME(DRV_IN),
REQ_OP_NAME(DRV_OUT),
};
#undef REQ_OP_NAME
/**
* blk_op_str - Return string XXX in the REQ_OP_XXX.
* @op: REQ_OP_XXX.
*
* Description: Centralize block layer function to convert REQ_OP_XXX into
* string format. Useful in the debugging and tracing bio or request. For
* invalid REQ_OP_XXX it returns string "UNKNOWN".
*/
inline const char *blk_op_str(unsigned int op)
{
const char *op_str = "UNKNOWN";
if (op < ARRAY_SIZE(blk_op_name) && blk_op_name[op])
op_str = blk_op_name[op];
return op_str;
}
EXPORT_SYMBOL_GPL(blk_op_str);
static const struct { static const struct {
int errno; int errno;
const char *name; const char *name;
......
...@@ -865,6 +865,9 @@ extern void blk_execute_rq(struct request_queue *, struct gendisk *, ...@@ -865,6 +865,9 @@ extern void blk_execute_rq(struct request_queue *, struct gendisk *,
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *, extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
struct request *, int, rq_end_io_fn *); struct request *, int, rq_end_io_fn *);
/* Helper to convert REQ_OP_XXX to its string format XXX */
extern const char *blk_op_str(unsigned int op);
int blk_status_to_errno(blk_status_t status); int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno); blk_status_t errno_to_blk_status(int errno);
......
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