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lib/scsi: Pass bdev_name instead of bdev to scsi_lun_construct()

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Pass not bdev but bdev_name to scsi_lun_construct() to fix the
race condition due to the time gap between spdk_bdev_get_by_name()
and spdk_bdev_open(). A pointer to a bdev is valid only while the
bdev is opened.

spdk_bdev_open() has been replaced recently by spdk_bdev_open_ext(),
but the issue still existed.

Signed-off-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Change-Id: Ic462422dbc2501c24907f56a36570fbb54fef65b
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4482
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
This commit is contained in:
Shuhei Matsumoto 2020-09-30 21:23:50 +09:00 committed by Tomasz Zawadzki
parent 357c9580a1
commit ab808d2b68
5 changed files with 30 additions and 57 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
lib/scsi/dev.c
View File

@ -151,16 +151,8 @@ spdk_scsi_dev_add_lun_ext(struct spdk_scsi_dev *dev, const char *bdev_name, int
void (*hotremove_cb)(const struct spdk_scsi_lun *, void *),
void *hotremove_ctx)
{
struct spdk_bdev *bdev;
struct spdk_scsi_lun *lun;
bdev = spdk_bdev_get_by_name(bdev_name);
if (bdev == NULL) {
SPDK_ERRLOG("device %s: cannot find bdev '%s' (target %d)\n",
dev->name, bdev_name, lun_id);
return -1;
}
/* Search the lowest free LUN ID if LUN ID is default */
if (lun_id == -1) {
lun_id = scsi_dev_find_lowest_free_lun_id(dev);
@ -170,7 +162,7 @@ spdk_scsi_dev_add_lun_ext(struct spdk_scsi_dev *dev, const char *bdev_name, int
}
}
lun = scsi_lun_construct(bdev, resize_cb, resize_ctx, hotremove_cb, hotremove_ctx);
lun = scsi_lun_construct(bdev_name, resize_cb, resize_ctx, hotremove_cb, hotremove_ctx);
if (lun == NULL) {
return -1;
}

17
lib/scsi/lun.c
View File

@ -418,12 +418,12 @@ bdev_event_cb(enum spdk_bdev_event_type type, struct spdk_bdev *bdev,
/**
* \brief Constructs a new spdk_scsi_lun object based on the provided parameters.
*
* \param bdev bdev associated with this LUN
* \param bdev_name Bdev name to open and associate with this LUN
*
* \return NULL if bdev == NULL
* \return NULL if bdev whose name matches is not found
* \return pointer to the new spdk_scsi_lun object otherwise
*/
struct spdk_scsi_lun *scsi_lun_construct(struct spdk_bdev *bdev,
struct spdk_scsi_lun *scsi_lun_construct(const char *bdev_name,
void (*resize_cb)(const struct spdk_scsi_lun *, void *),
void *resize_ctx,
void (*hotremove_cb)(const struct spdk_scsi_lun *, void *),
@ -432,8 +432,8 @@ struct spdk_scsi_lun *scsi_lun_construct(struct spdk_bdev *bdev,
struct spdk_scsi_lun *lun;
int rc;
if (bdev == NULL) {
SPDK_ERRLOG("bdev must be non-NULL\n");
if (bdev_name == NULL) {
SPDK_ERRLOG("bdev_name must be non-NULL\n");
return NULL;
}
@ -443,10 +443,10 @@ struct spdk_scsi_lun *scsi_lun_construct(struct spdk_bdev *bdev,
return NULL;
}
rc = spdk_bdev_open_ext(spdk_bdev_get_name(bdev), true, bdev_event_cb, lun, &lun->bdev_desc);
rc = spdk_bdev_open_ext(bdev_name, true, bdev_event_cb, lun, &lun->bdev_desc);
if (rc != 0) {
SPDK_ERRLOG("bdev %s cannot be opened, error=%d\n", spdk_bdev_get_name(bdev), rc);
SPDK_ERRLOG("bdev %s cannot be opened, error=%d\n", bdev_name, rc);
free(lun);
return NULL;
}
@ -458,7 +458,8 @@ struct spdk_scsi_lun *scsi_lun_construct(struct spdk_bdev *bdev,
TAILQ_INIT(&lun->mgmt_tasks);
TAILQ_INIT(&lun->pending_mgmt_tasks);
lun->bdev = bdev;
/* Bdev is not removed while it is opened. */
lun->bdev = spdk_bdev_desc_get_bdev(lun->bdev_desc);
lun->io_channel = NULL;
lun->hotremove_cb = hotremove_cb;
lun->hotremove_ctx = hotremove_ctx;

2
lib/scsi/scsi_internal.h
View File

@ -175,7 +175,7 @@ struct spdk_scsi_lun {
struct spdk_poller *reset_poller;
};
struct spdk_scsi_lun *scsi_lun_construct(struct spdk_bdev *bdev,
struct spdk_scsi_lun *scsi_lun_construct(const char *bdev_name,
void (*resize_cb)(const struct spdk_scsi_lun *, void *),
void *resize_ctx,
void (*hotremove_cb)(const struct spdk_scsi_lun *, void *),

42
test/unit/lib/scsi/dev.c/dev_ut.c
View File

@ -43,25 +43,14 @@
#include "spdk_internal/mock.h"
/* Unit test bdev mockup */
struct spdk_bdev {
char name[100];
};
static struct spdk_bdev g_bdevs[] = {
{"malloc0"},
{"malloc1"},
static char *g_bdev_names[] = {
"malloc0",
"malloc1",
};
static struct spdk_scsi_port *g_initiator_port_with_pending_tasks = NULL;
static struct spdk_scsi_port *g_initiator_port_with_pending_mgmt_tasks = NULL;
const char *
spdk_bdev_get_name(const struct spdk_bdev *bdev)
{
return bdev->name;
}
static struct spdk_scsi_task *
spdk_get_task(uint32_t *owner_task_ctr)
{
@ -81,20 +70,25 @@ spdk_scsi_task_put(struct spdk_scsi_task *task)
free(task);
}
struct spdk_scsi_lun *scsi_lun_construct(struct spdk_bdev *bdev,
struct spdk_scsi_lun *scsi_lun_construct(const char *bdev_name,
void (*resize_cb)(const struct spdk_scsi_lun *, void *),
void *resize_ctx,
void (*hotremove_cb)(const struct spdk_scsi_lun *, void *),
void *hotremove_ctx)
{
struct spdk_scsi_lun *lun;
size_t i;
for (i = 0; i < SPDK_COUNTOF(g_bdev_names); i++) {
if (strcmp(bdev_name, g_bdev_names[i]) == 0) {
lun = calloc(1, sizeof(struct spdk_scsi_lun));
SPDK_CU_ASSERT_FATAL(lun != NULL);
lun->bdev = bdev;
return lun;
}
}
return NULL;
}
void
@ -103,20 +97,6 @@ scsi_lun_destruct(struct spdk_scsi_lun *lun)
free(lun);
}
struct spdk_bdev *
spdk_bdev_get_by_name(const char *bdev_name)
{
size_t i;
for (i = 0; i < SPDK_COUNTOF(g_bdevs); i++) {
if (strcmp(bdev_name, g_bdevs[i].name) == 0) {
return &g_bdevs[i];
}
}
return NULL;
}
DEFINE_STUB_V(scsi_lun_execute_mgmt_task,
(struct spdk_scsi_lun *lun, struct spdk_scsi_task *task));

12
test/unit/lib/scsi/lun.c/lun_ut.c
View File

@ -105,6 +105,9 @@ DEFINE_STUB_V(spdk_bdev_close, (struct spdk_bdev_desc *desc));
DEFINE_STUB(spdk_bdev_get_name, const char *,
(const struct spdk_bdev *bdev), "test");
DEFINE_STUB(spdk_bdev_desc_get_bdev, struct spdk_bdev *,
(struct spdk_bdev_desc *bdev_desc), NULL);
DEFINE_STUB_V(spdk_scsi_dev_queue_mgmt_task,
(struct spdk_scsi_dev *dev, struct spdk_scsi_task *task));
@ -147,9 +150,8 @@ DEFINE_STUB(spdk_bdev_get_io_channel, struct spdk_io_channel *,
static struct spdk_scsi_lun *lun_construct(void)
{
struct spdk_scsi_lun *lun;
struct spdk_bdev bdev;
lun = scsi_lun_construct(&bdev, NULL, NULL, NULL, NULL);
lun = scsi_lun_construct("ut_bdev", NULL, NULL, NULL, NULL);
SPDK_CU_ASSERT_FATAL(lun != NULL);
return lun;
@ -582,7 +584,6 @@ lun_reset_task_suspend_scsi_task(void)
static void
lun_check_pending_tasks_only_for_specific_initiator(void)
{
struct spdk_bdev bdev = {};
struct spdk_scsi_lun *lun;
struct spdk_scsi_task task1 = {};
struct spdk_scsi_task task2 = {};
@ -590,7 +591,7 @@ lun_check_pending_tasks_only_for_specific_initiator(void)
struct spdk_scsi_port initiator_port2 = {};
struct spdk_scsi_port initiator_port3 = {};
lun = scsi_lun_construct(&bdev, NULL, NULL, NULL, NULL);
lun = scsi_lun_construct("ut_bdev", NULL, NULL, NULL, NULL);
task1.initiator_port = &initiator_port1;
task2.initiator_port = &initiator_port2;
@ -652,11 +653,10 @@ lun_check_pending_tasks_only_for_specific_initiator(void)
static void
abort_pending_mgmt_tasks_when_lun_is_removed(void)
{
struct spdk_bdev bdev = {};
struct spdk_scsi_lun *lun;
struct spdk_scsi_task task1, task2, task3;
lun = scsi_lun_construct(&bdev, NULL, NULL, NULL, NULL);
lun = scsi_lun_construct("ut_bdev", NULL, NULL, NULL, NULL);
/* Normal case */
ut_init_task(&task1);