From: Peter Lieven <pl@dlhnet.de>
To: "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>
Cc: Kevin Wolf <kwolf@redhat.com>,
Paolo Bonzini <pbonzini@redhat.com>,
ronnie sahlberg <ronniesahlberg@gmail.com>
Subject: [Qemu-devel] [PATCH v2] iscsi: fix deadlock during login
Date: Sat, 17 Nov 2012 14:37:39 +0100 [thread overview]
Message-ID: <50A79323.50403@dlhnet.de> (raw)
If the connection is interrupted before the first login is successfully
completed qemu-kvm is waiting forever in qemu_aio_wait().
This is fixed by performing an sync login to the target. If the
connection breaks after the first successful login errors are
handled internally by libiscsi.
v2:
changed the complete iscsi_open routine to sync tasks.
Signed-off-by: Peter Lieven <pl@kamp.de>
---
block/iscsi.c | 251 ++++++++++++++++-----------------------------------------
1 file changed, 70 insertions(+), 181 deletions(-)
diff --git a/block/iscsi.c b/block/iscsi.c
index d0b1a10..4bc3d4b 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -65,13 +65,6 @@ typedef struct IscsiAIOCB {
#endif
} IscsiAIOCB;
-struct IscsiTask {
- IscsiLun *iscsilun;
- BlockDriverState *bs;
- int status;
- int complete;
-};
-
static void
iscsi_bh_cb(void *p)
{
@@ -665,163 +658,6 @@ iscsi_getlength(BlockDriverState *bs)
return len;
}
-static void
-iscsi_readcapacity16_cb(struct iscsi_context *iscsi, int status,
- void *command_data, void *opaque)
-{
- struct IscsiTask *itask = opaque;
- struct scsi_readcapacity16 *rc16;
- struct scsi_task *task = command_data;
-
- if (status != 0) {
- error_report("iSCSI: Failed to read capacity of iSCSI lun. %s",
- iscsi_get_error(iscsi));
- itask->status = 1;
- itask->complete = 1;
- scsi_free_scsi_task(task);
- return;
- }
-
- rc16 = scsi_datain_unmarshall(task);
- if (rc16 == NULL) {
- error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
- itask->status = 1;
- itask->complete = 1;
- scsi_free_scsi_task(task);
- return;
- }
-
- itask->iscsilun->block_size = rc16->block_length;
- itask->iscsilun->num_blocks = rc16->returned_lba + 1;
- itask->bs->total_sectors = itask->iscsilun->num_blocks *
- itask->iscsilun->block_size / BDRV_SECTOR_SIZE ;
-
- itask->status = 0;
- itask->complete = 1;
- scsi_free_scsi_task(task);
-}
-
-static void
-iscsi_readcapacity10_cb(struct iscsi_context *iscsi, int status,
- void *command_data, void *opaque)
-{
- struct IscsiTask *itask = opaque;
- struct scsi_readcapacity10 *rc10;
- struct scsi_task *task = command_data;
-
- if (status != 0) {
- error_report("iSCSI: Failed to read capacity of iSCSI lun. %s",
- iscsi_get_error(iscsi));
- itask->status = 1;
- itask->complete = 1;
- scsi_free_scsi_task(task);
- return;
- }
-
- rc10 = scsi_datain_unmarshall(task);
- if (rc10 == NULL) {
- error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
- itask->status = 1;
- itask->complete = 1;
- scsi_free_scsi_task(task);
- return;
- }
-
- itask->iscsilun->block_size = rc10->block_size;
- if (rc10->lba == 0) {
- /* blank disk loaded */
- itask->iscsilun->num_blocks = 0;
- } else {
- itask->iscsilun->num_blocks = rc10->lba + 1;
- }
- itask->bs->total_sectors = itask->iscsilun->num_blocks *
- itask->iscsilun->block_size / BDRV_SECTOR_SIZE ;
-
- itask->status = 0;
- itask->complete = 1;
- scsi_free_scsi_task(task);
-}
-
-static void
-iscsi_inquiry_cb(struct iscsi_context *iscsi, int status, void *command_data,
- void *opaque)
-{
- struct IscsiTask *itask = opaque;
- struct scsi_task *task = command_data;
- struct scsi_inquiry_standard *inq;
-
- if (status != 0) {
- itask->status = 1;
- itask->complete = 1;
- scsi_free_scsi_task(task);
- return;
- }
-
- inq = scsi_datain_unmarshall(task);
- if (inq == NULL) {
- error_report("iSCSI: Failed to unmarshall inquiry data.");
- itask->status = 1;
- itask->complete = 1;
- scsi_free_scsi_task(task);
- return;
- }
-
- itask->iscsilun->type = inq->periperal_device_type;
-
- scsi_free_scsi_task(task);
-
- switch (itask->iscsilun->type) {
- case TYPE_DISK:
- task = iscsi_readcapacity16_task(iscsi, itask->iscsilun->lun,
- iscsi_readcapacity16_cb, opaque);
- if (task == NULL) {
- error_report("iSCSI: failed to send readcapacity16 command.");
- itask->status = 1;
- itask->complete = 1;
- return;
- }
- break;
- case TYPE_ROM:
- task = iscsi_readcapacity10_task(iscsi, itask->iscsilun->lun,
- 0, 0,
- iscsi_readcapacity10_cb, opaque);
- if (task == NULL) {
- error_report("iSCSI: failed to send readcapacity16 command.");
- itask->status = 1;
- itask->complete = 1;
- return;
- }
- break;
- default:
- itask->status = 0;
- itask->complete = 1;
- }
-}
-
-static void
-iscsi_connect_cb(struct iscsi_context *iscsi, int status, void *command_data,
- void *opaque)
-{
- struct IscsiTask *itask = opaque;
- struct scsi_task *task;
-
- if (status != 0) {
- itask->status = 1;
- itask->complete = 1;
- return;
- }
-
- task = iscsi_inquiry_task(iscsi, itask->iscsilun->lun,
- 0, 0, 36,
- iscsi_inquiry_cb, opaque);
- if (task == NULL) {
- error_report("iSCSI: failed to send inquiry command.");
- itask->status = 1;
- itask->complete = 1;
- return;
- }
-}
-
static int parse_chap(struct iscsi_context *iscsi, const char *target)
{
QemuOptsList *list;
@@ -934,7 +770,10 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
IscsiLun *iscsilun = bs->opaque;
struct iscsi_context *iscsi = NULL;
struct iscsi_url *iscsi_url = NULL;
- struct IscsiTask task;
+ struct scsi_task *task = NULL;
+ struct scsi_inquiry_standard *inq = NULL;
+ struct scsi_readcapacity10 *rc10 = NULL;
+ struct scsi_readcapacity16 *rc16 = NULL;
char *initiator_name = NULL;
int ret;
@@ -998,33 +837,80 @@ static int iscsi_open(BlockDriverState *bs, const char *filename, int flags)
/* check if we got HEADER_DIGEST via the options */
parse_header_digest(iscsi, iscsi_url->target);
- task.iscsilun = iscsilun;
- task.status = 0;
- task.complete = 0;
- task.bs = bs;
+ if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
+ error_report("iSCSI: Failed to connect to LUN : %s",
+ iscsi_get_error(iscsi));
+ ret = -EINVAL;
+ goto out;
+ }
iscsilun->iscsi = iscsi;
iscsilun->lun = iscsi_url->lun;
- if (iscsi_full_connect_async(iscsi, iscsi_url->portal, iscsi_url->lun,
- iscsi_connect_cb, &task)
- != 0) {
- error_report("iSCSI: Failed to start async connect.");
+ task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 0, 0, 36);
+
+ if (task == NULL || task->status != SCSI_STATUS_GOOD) {
+ error_report("iSCSI: failed to send inquiry command.");
ret = -EINVAL;
goto out;
}
-
- while (!task.complete) {
- iscsi_set_events(iscsilun);
- qemu_aio_wait();
- }
- if (task.status != 0) {
- error_report("iSCSI: Failed to connect to LUN : %s",
- iscsi_get_error(iscsi));
+
+ inq = scsi_datain_unmarshall(task);
+ if (inq == NULL) {
+ error_report("iSCSI: Failed to unmarshall inquiry data.");
ret = -EINVAL;
goto out;
}
+ iscsilun->type = inq->periperal_device_type;
+
+ scsi_free_scsi_task(task);
+
+ switch (iscsilun->type) {
+ case TYPE_DISK:
+ task = iscsi_readcapacity16_sync(iscsi, iscsilun->lun);
+ if (task == NULL || task->status != SCSI_STATUS_GOOD) {
+ error_report("iSCSI: failed to send readcapacity16 command.");
+ ret = -EINVAL;
+ goto out;
+ }
+ rc16 = scsi_datain_unmarshall(task);
+ if (rc16 == NULL) {
+ error_report("iSCSI: Failed to unmarshall readcapacity16 data.");
+ ret = -EINVAL;
+ goto out;
+ }
+ iscsilun->block_size = rc16->block_length;
+ iscsilun->num_blocks = rc16->returned_lba + 1;
+ break;
+ case TYPE_ROM:
+ task = iscsi_readcapacity10_sync(iscsi, iscsilun->lun, 0, 0);
+ if (task == NULL || task->status != SCSI_STATUS_GOOD) {
+ error_report("iSCSI: failed to send readcapacity10 command.");
+ ret = -EINVAL;
+ goto out;
+ }
+ rc10 = scsi_datain_unmarshall(task);
+ if (rc10 == NULL) {
+ error_report("iSCSI: Failed to unmarshall readcapacity10 data.");
+ ret = -EINVAL;
+ goto out;
+ }
+ iscsilun->block_size = rc10->block_size;
+ if (rc10->lba == 0) {
+ /* blank disk loaded */
+ iscsilun->num_blocks = 0;
+ } else {
+ iscsilun->num_blocks = rc10->lba + 1;
+ }
+ break;
+ default:
+ break;
+ }
+
+ bs->total_sectors = iscsilun->num_blocks *
+ iscsilun->block_size / BDRV_SECTOR_SIZE ;
+
/* Medium changer or tape. We dont have any emulation for this so this must
* be sg ioctl compatible. We force it to be sg, otherwise qemu will try
* to read from the device to guess the image format.
@@ -1043,6 +929,9 @@ out:
if (iscsi_url != NULL) {
iscsi_destroy_url(iscsi_url);
}
+ if (task != NULL) {
+ scsi_free_scsi_task(task);
+ }
if (ret) {
if (iscsi != NULL) {
--
1.7.9.5
next reply other threads:[~2012-11-17 13:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-17 13:37 Peter Lieven [this message]
2012-11-19 8:27 ` [Qemu-devel] [PATCH v2] iscsi: fix deadlock during login Paolo Bonzini
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