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bdev: encapsulate buffer members of spdk_bdev_io

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The members of spdk_bdev_io which are associated with the data buffer
should only be modified by calling functions in bdev.c

Change-Id: Icacb7f7387d626cf6834480b572e2f31b48666e1
Signed-off-by: Seth Howell <seth.howell@intel.com>
Reviewed-on: https://review.gerrithub.io/416054
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Seth Howell 2018-06-19 15:08:31 -07:00 committed by Jim Harris
parent c5b861fcec
commit 30dbeae891
2 changed files with 19 additions and 19 deletions
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18
include/spdk/bdev_module.h
View File

@ -398,15 +398,6 @@ struct spdk_bdev_io {
} nvme_passthru;
} u;
/** bdev allocated memory associated with this request */
void *buf;
/** requested size of the buffer associated with this I/O */
uint64_t buf_len;
/** Callback for when buf is allocated */
spdk_bdev_io_get_buf_cb get_buf_cb;
/** Member used for linking child I/Os together. */
TAILQ_ENTRY(spdk_bdev_io) link;
@ -417,6 +408,15 @@ struct spdk_bdev_io {
* must not read or write to these fields.
*/
struct __bdev_io_internal_fields {
/** bdev allocated memory associated with this request */
void *buf;
/** requested size of the buffer associated with this I/O */
uint64_t buf_len;
/** 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. */
STAILQ_ENTRY(spdk_bdev_io) buf_link;
} internal;

20
lib/bdev/bdev.c
View File

@ -380,14 +380,14 @@ spdk_bdev_get_by_name(const char *bdev_name)
static void
spdk_bdev_io_set_buf(struct spdk_bdev_io *bdev_io, void *buf)
{
assert(bdev_io->get_buf_cb != NULL);
assert(bdev_io->internal.get_buf_cb != NULL);
assert(buf != NULL);
assert(bdev_io->u.bdev.iovs != NULL);
bdev_io->buf = buf;
bdev_io->internal.buf = buf;
bdev_io->u.bdev.iovs[0].iov_base = (void *)((unsigned long)((char *)buf + 512) & ~511UL);
bdev_io->u.bdev.iovs[0].iov_len = bdev_io->buf_len;
bdev_io->get_buf_cb(bdev_io->ch->channel, bdev_io);
bdev_io->u.bdev.iovs[0].iov_len = bdev_io->internal.buf_len;
bdev_io->internal.get_buf_cb(bdev_io->ch->channel, bdev_io);
}
static void
@ -401,10 +401,10 @@ spdk_bdev_io_put_buf(struct spdk_bdev_io *bdev_io)
assert(bdev_io->u.bdev.iovcnt == 1);
buf = bdev_io->buf;
buf = bdev_io->internal.buf;
ch = bdev_io->ch->shared_resource->mgmt_ch;
if (bdev_io->buf_len <= SPDK_BDEV_SMALL_BUF_MAX_SIZE) {
if (bdev_io->internal.buf_len <= SPDK_BDEV_SMALL_BUF_MAX_SIZE) {
pool = g_bdev_mgr.buf_small_pool;
stailq = &ch->need_buf_small;
} else {
@ -441,8 +441,8 @@ spdk_bdev_io_get_buf(struct spdk_bdev_io *bdev_io, spdk_bdev_io_get_buf_cb cb, u
assert(len <= SPDK_BDEV_LARGE_BUF_MAX_SIZE);
mgmt_ch = bdev_io->ch->shared_resource->mgmt_ch;
bdev_io->buf_len = len;
bdev_io->get_buf_cb = cb;
bdev_io->internal.buf_len = len;
bdev_io->internal.get_buf_cb = cb;
if (len <= SPDK_BDEV_SMALL_BUF_MAX_SIZE) {
pool = g_bdev_mgr.buf_small_pool;
stailq = &mgmt_ch->need_buf_small;
@ -947,7 +947,7 @@ spdk_bdev_free_io(struct spdk_bdev_io *bdev_io)
assert(bdev_io != NULL);
assert(bdev_io->status != SPDK_BDEV_IO_STATUS_PENDING);
if (bdev_io->buf != NULL) {
if (bdev_io->internal.buf != NULL) {
spdk_bdev_io_put_buf(bdev_io);
}
@ -1097,7 +1097,7 @@ spdk_bdev_io_init(struct spdk_bdev_io *bdev_io,
bdev_io->cb = cb;
bdev_io->status = SPDK_BDEV_IO_STATUS_PENDING;
bdev_io->in_submit_request = false;
bdev_io->buf = NULL;
bdev_io->internal.buf = NULL;
bdev_io->io_submit_ch = NULL;
}