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Revert "scsi: remove LUN I/O channel ref counting"

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This reverts commit d3828a23ec.

GitHub issue #202 reports that this causes a crash with two or more
iSCSI connections on the same LUN.

Change-Id: I9ffb85d393eb506aac9d176299a3b3bcf021a38c
Reviewed-on: https://review.gerrithub.io/379866
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Daniel Verkamp 2017-09-25 09:23:57 -07:00
parent 4f1ba029b3
commit 4affd37f2b
2 changed files with 21 additions and 4 deletions
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17
lib/scsi/lun.c
View File

@ -373,8 +373,12 @@ spdk_scsi_lun_delete(const char *lun_name)
int spdk_scsi_lun_allocate_io_channel(struct spdk_scsi_lun *lun)
{
if (lun->io_channel != NULL) {
assert(spdk_io_channel_get_thread(lun->io_channel) == spdk_get_thread());
return 0;
if (pthread_self() == lun->thread_id) {
lun->ref++;
return 0;
}
SPDK_ERRLOG("io_channel already allocated for lun %s\n", lun->name);
return -1;
}
lun->lcore = spdk_env_get_current_core();
@ -383,14 +387,19 @@ int spdk_scsi_lun_allocate_io_channel(struct spdk_scsi_lun *lun)
if (lun->io_channel == NULL) {
return -1;
}
lun->thread_id = pthread_self();
lun->ref = 1;
return 0;
}
void spdk_scsi_lun_free_io_channel(struct spdk_scsi_lun *lun)
{
if (lun->io_channel != NULL) {
spdk_put_io_channel(lun->io_channel);
lun->io_channel = NULL;
lun->ref--;
if (lun->ref == 0) {
spdk_put_io_channel(lun->io_channel);
lun->io_channel = NULL;
}
}
}

8
lib/scsi/scsi_internal.h
View File

@ -87,6 +87,14 @@ struct spdk_scsi_lun {
/** I/O channel for the bdev associated with this LUN. */
struct spdk_io_channel *io_channel;
/** Thread ID for the thread that allocated the I/O channel for this
* LUN. All I/O to this LUN must be performed from this thread.
*/
pthread_t thread_id;
/** The reference number for this LUN, thus we can correctly free the io_channel */
uint32_t ref;
/** Name for this LUN. */
char name[SPDK_SCSI_LUN_MAX_NAME_LENGTH];