spdk_bdev_io Struct Reference

Collaboration diagram for spdk_bdev_io:

Data Structures
struct	__bdev_io_internal_fields
	Fields that are used internally by the bdev subsystem. More...

Public Member Functions
	TAILQ_ENTRY (spdk_bdev_io) module_link
	It may be used by modules to put the bdev_io into its own list.

Data Fields
struct spdk_bdev *	bdev
	The block device that this I/O belongs to.
uint8_t	type
	Enumerated value representing the I/O type.
uint16_t	num_retries
	Number of IO submission retries.
struct iovec	iov
	A single iovec element for use by this bdev_io.
struct iovec	child_iov [SPDK_BDEV_IO_NUM_CHILD_IOV]
	Array of iovecs used for I/O splitting.
union {
struct {
struct iovec *   iovs
	For SG buffer cases, array of iovecs to transfer.
int   iovcnt
	For SG buffer cases, number of iovecs in iovec array.
struct iovec *   fused_iovs
	For fused operations such as COMPARE_AND_WRITE, array of iovecs for the second operation.
int   fused_iovcnt
	Number of iovecs in fused_iovs.
void *   md_buf
uint64_t   num_blocks
	Total size of data to be transferred.
uint64_t   offset_blocks
	Starting offset (in blocks) of the bdev for this I/O.
struct spdk_memory_domain *   memory_domain
	Memory domain and its context to be used by bdev modules.
void *   memory_domain_ctx
struct spdk_accel_sequence *   accel_sequence
spdk_bdev_io_completion_cb   stored_user_cb
	stored user callback in case we split the I/O and use a temporary callback
uint64_t   split_remaining_num_blocks
	number of blocks remaining in a split i/o
uint64_t   split_current_offset_blocks
	current offset of the split I/O in the bdev
uint32_t   split_outstanding
	count of outstanding batched split I/Os
struct {
uint8_t   populate: 1
	Whether the buffer should be populated with the real data.
uint8_t   commit: 1
	Whether the buffer should be committed back to disk.
uint8_t   start: 1
	True if this request is in the 'start' phase of zcopy. More...
}   zcopy
struct {
void *   bio_cb_arg
	The callback argument for the outstanding request which this abort attempts to cancel.
}   abort
struct {
uint64_t   offset
	The offset of next data/hole. More...
}   seek
struct {
uint64_t   src_offset_blocks
	Starting source offset (in blocks) of the bdev for copy I/O.
}   copy
}   bdev
struct {
struct spdk_io_channel *   ch_ref
	Channel reference held while messages for this reset are in progress.
struct {
struct spdk_poller *   poller
uint64_t   stop_time_tsc
}   wait_poller
}   reset
struct {
struct spdk_bdev_io *   bio_to_abort
	The outstanding request matching bio_cb_arg which this abort attempts to cancel.
}   abort
struct {
struct spdk_nvme_cmd   cmd
void *   buf
size_t   nbytes
void *   md_buf
size_t   md_len
}   nvme_passthru
struct {
uint64_t   zone_id
uint32_t   num_zones
enum spdk_bdev_zone_action   zone_action
void *   buf
}   zone_mgmt
}	u
struct spdk_bdev_io::__bdev_io_internal_fields	internal
uint8_t	driver_ctx [0]
	Per I/O context for use by the bdev module.

Field Documentation

offset

uint64_t spdk_bdev_io::offset

The offset of next data/hole.

start

uint8_t spdk_bdev_io::start

True if this request is in the 'start' phase of zcopy.

False if in 'end'.

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The documentation for this struct was generated from the following file:

• bdev_module.h