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bdev: Make an internal version of spdk_bdev_io_type_supported

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Within the bdev layer, we want to know specifically what I/O
types the module supports. However, the bdev module may elect
to emulate some commands and report additional support via
the public API.

The bdev layer already emulates WRITE_ZEROES, so correctly
report that fact.

Change-Id: I79bfb1aee1b3e6048f951bb1b2c7d4f7c9ef184d
Signed-off-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-on: https://review.gerrithub.io/416464
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Ben Walker 2018-06-21 09:34:42 -07:00 committed by Daniel Verkamp
parent 253c61be4e
commit a4d22f7bdc
1 changed files with 27 additions and 3 deletions
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30
lib/bdev/bdev.c
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@ -1101,10 +1101,31 @@ spdk_bdev_io_init(struct spdk_bdev_io *bdev_io,
bdev_io->internal.io_submit_ch = NULL;
}
static bool
_spdk_bdev_io_type_supported(struct spdk_bdev *bdev, enum spdk_bdev_io_type io_type)
{
return bdev->fn_table->io_type_supported(bdev->ctxt, io_type);
}
bool
spdk_bdev_io_type_supported(struct spdk_bdev *bdev, enum spdk_bdev_io_type io_type)
{
return bdev->fn_table->io_type_supported(bdev->ctxt, io_type);
bool supported;
supported = _spdk_bdev_io_type_supported(bdev, io_type);
if (!supported) {
switch (io_type) {
case SPDK_BDEV_IO_TYPE_WRITE_ZEROES:
/* The bdev layer will emulate write zeroes as long as write is supported. */
supported = _spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE);
break;
default:
break;
}
}
return supported;
}
int
@ -1867,13 +1888,13 @@ spdk_bdev_write_zeroes_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channe
bdev_io->internal.ch = channel;
bdev_io->u.bdev.offset_blocks = offset_blocks;
if (spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE_ZEROES)) {
if (_spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE_ZEROES)) {
bdev_io->type = SPDK_BDEV_IO_TYPE_WRITE_ZEROES;
bdev_io->u.bdev.num_blocks = num_blocks;
bdev_io->u.bdev.iovs = NULL;
bdev_io->u.bdev.iovcnt = 0;
} else {
} else if (_spdk_bdev_io_type_supported(bdev, SPDK_BDEV_IO_TYPE_WRITE)) {
assert(spdk_bdev_get_block_size(bdev) <= ZERO_BUFFER_SIZE);
len = spdk_bdev_get_block_size(bdev) * num_blocks;
@ -1891,6 +1912,9 @@ spdk_bdev_write_zeroes_blocks(struct spdk_bdev_desc *desc, struct spdk_io_channe
bdev_io->u.bdev.num_blocks = len / spdk_bdev_get_block_size(bdev);
bdev_io->u.bdev.split_remaining_num_blocks = num_blocks - bdev_io->u.bdev.num_blocks;
bdev_io->u.bdev.split_current_offset_blocks = offset_blocks + bdev_io->u.bdev.num_blocks;
} else {
spdk_bdev_free_io(bdev_io);
return -ENOTSUP;
}
if (split_request) {