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bdev: rearrange spdk_bdev_io

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Move some of the fields in spdk_bdev_io (the layout of which is no
longer public API) to put related fields together and improve struct
packing.

Change-Id: I0ca5d9441b00c65703c35391d125059eaa4bcee3
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2017-05-16 10:42:55 -07:00
parent 928df4a448
commit 5bb041adcf
1 changed files with 12 additions and 12 deletions
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24
include/spdk_internal/bdev.h
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@ -154,12 +154,18 @@ struct spdk_bdev_io {
/** The bdev I/O channel that this was submitted on. */
struct spdk_bdev_channel *ch;
/** Generation value for each I/O. */
uint32_t gencnt;
/** bdev allocated memory associated with this request */
void *buf;
/** Callback for when buf is allocated */
spdk_bdev_io_get_buf_cb get_buf_cb;
/** Entry to the list need_buf of struct spdk_bdev. */
TAILQ_ENTRY(spdk_bdev_io) buf_link;
/** Generation value for each I/O. */
uint32_t gencnt;
/** Enumerated value representing the I/O type. */
enum spdk_bdev_io_type type;
@ -215,6 +221,9 @@ struct spdk_bdev_io {
} reset;
} u;
/** Status for the IO */
enum spdk_bdev_io_status status;
/** Error information from a device */
union {
/** Only valid when status is SPDK_BDEV_IO_STATUS_NVME_ERROR */
@ -243,12 +252,6 @@ struct spdk_bdev_io {
/** Context that will be passed to the completion callback */
void *caller_ctx;
/** Callback for when buf is allocated */
spdk_bdev_io_get_buf_cb get_buf_cb;
/** Status for the IO */
enum spdk_bdev_io_status status;
/**
* Set to true while the bdev module submit_request function is in progress.
*
@ -266,9 +269,6 @@ struct spdk_bdev_io {
/** Member used for linking child I/Os together. */
TAILQ_ENTRY(spdk_bdev_io) link;
/** Entry to the list need_buf of struct spdk_bdev. */
TAILQ_ENTRY(spdk_bdev_io) buf_link;
/** Per I/O context for use by the blockdev module */
uint8_t driver_ctx[0];