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[Qemu-devel] [RFC][PATCH] iscsi: retry read, write, flush and unmap on u


From: Peter Lieven
Subject: [Qemu-devel] [RFC][PATCH] iscsi: retry read, write, flush and unmap on unit attention check conditions
Date: Mon, 18 Feb 2013 16:58:50 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2

the target might return a unit attention check condition status for various
reasons (e.g. bus reset, capacity change, thin-provisioning info etc.).

currently all these informative status responses lead to an I/O error
which is populated to the guest. this patch introduces a retry mechanism
to avoid this.

Signed-off-by: Peter Lieven <address@hidden>
---
 block/iscsi.c |  300 +++++++++++++++++++++++++++++++++++++++------------------
 1 file changed, 208 insertions(+), 92 deletions(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index 1ea290e..fc98eea 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -60,8 +60,11 @@ typedef struct IscsiAIOCB {
     uint8_t *buf;
     int status;
     int canceled;
+    int retries;
     size_t read_size;
     size_t read_offset;
+    int64_t sector_num;
+    int nb_sectors;
 #ifdef __linux__
     sg_io_hdr_t *ioh;
 #endif
@@ -69,6 +72,7 @@ typedef struct IscsiAIOCB {

 #define NOP_INTERVAL 5000
 #define MAX_NOP_FAILURES 3
+#define ISCSI_CMD_RETRIES 5

 static void
 iscsi_bh_cb(void *p)
@@ -191,6 +195,8 @@ iscsi_process_write(void *arg)
     iscsi_set_events(iscsilun);
 }

+static int
+iscsi_aio_writev_acb(IscsiAIOCB *acb);

 static void
 iscsi_aio_write16_cb(struct iscsi_context *iscsi, int status,
@@ -208,7 +214,19 @@ iscsi_aio_write16_cb(struct iscsi_context *iscsi, int 
status,
     }

     acb->status = 0;
-    if (status < 0) {
+    if (status != 0) {
+        if (status == SCSI_STATUS_CHECK_CONDITION
+            && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION
+            && acb->retries-- > 0) {
+            if (acb->task != NULL) {
+                scsi_free_scsi_task(acb->task);
+                acb->task = NULL;
+            }
+            if (iscsi_aio_writev_acb(acb) == 0) {
+                iscsi_set_events(acb->iscsilun);
+                return;
+            }
+        }
         error_report("Failed to write16 data to iSCSI lun. %s",
                      iscsi_get_error(iscsi));
         acb->status = -EIO;
@@ -222,15 +240,10 @@ static int64_t sector_qemu2lun(int64_t sector, IscsiLun 
*iscsilun)
     return sector * BDRV_SECTOR_SIZE / iscsilun->block_size;
 }

-static BlockDriverAIOCB *
-iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
-                 QEMUIOVector *qiov, int nb_sectors,
-                 BlockDriverCompletionFunc *cb,
-                 void *opaque)
+static int
+iscsi_aio_writev_acb(IscsiAIOCB *acb)
 {
-    IscsiLun *iscsilun = bs->opaque;
-    struct iscsi_context *iscsi = iscsilun->iscsi;
-    IscsiAIOCB *acb;
+    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
     size_t size;
     uint32_t num_sectors;
     uint64_t lba;
@@ -238,20 +251,14 @@ iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
     struct iscsi_data data;
 #endif
     int ret;
-
-    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
-    trace_iscsi_aio_writev(iscsi, sector_num, nb_sectors, opaque, acb);
-
-    acb->iscsilun = iscsilun;
-    acb->qiov     = qiov;
-
+
     acb->canceled   = 0;
     acb->bh         = NULL;
     acb->status     = -EINPROGRESS;
     acb->buf        = NULL;

     /* this will allow us to get rid of 'buf' completely */
-    size = nb_sectors * BDRV_SECTOR_SIZE;
+    size = acb->nb_sectors * BDRV_SECTOR_SIZE;

 #if !defined(LIBISCSI_FEATURE_IOVECTOR)
     data.size = MIN(size, acb->qiov->size);
@@ -270,48 +277,76 @@ iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
     if (acb->task == NULL) {
         error_report("iSCSI: Failed to allocate task for scsi WRITE16 "
                      "command. %s", iscsi_get_error(iscsi));
-        qemu_aio_release(acb);
-        return NULL;
+        return -1;
     }
     memset(acb->task, 0, sizeof(struct scsi_task));

     acb->task->xfer_dir = SCSI_XFER_WRITE;
     acb->task->cdb_size = 16;
     acb->task->cdb[0] = 0x8a;
-    lba = sector_qemu2lun(sector_num, iscsilun);
+    lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
     *(uint32_t *)&acb->task->cdb[2]  = htonl(lba >> 32);
     *(uint32_t *)&acb->task->cdb[6]  = htonl(lba & 0xffffffff);
-    num_sectors = size / iscsilun->block_size;
+    num_sectors = size / acb->iscsilun->block_size;
     *(uint32_t *)&acb->task->cdb[10] = htonl(num_sectors);
     acb->task->expxferlen = size;

 #if defined(LIBISCSI_FEATURE_IOVECTOR)
-    ret = iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
+    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                    iscsi_aio_write16_cb,
                                    NULL,
                                    acb);
 #else
-    ret = iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
+    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                    iscsi_aio_write16_cb,
                                    &data,
                                    acb);
 #endif
     if (ret != 0) {
-        scsi_free_scsi_task(acb->task);
         g_free(acb->buf);
-        qemu_aio_release(acb);
-        return NULL;
+        return -1;
     }

 #if defined(LIBISCSI_FEATURE_IOVECTOR)
     scsi_task_set_iov_out(acb->task, (struct scsi_iovec*) acb->qiov->iov, 
acb->qiov->niov);
 #endif

-    iscsi_set_events(iscsilun);
+    return 0;
+}
+
+static BlockDriverAIOCB *
+iscsi_aio_writev(BlockDriverState *bs, int64_t sector_num,
+                 QEMUIOVector *qiov, int nb_sectors,
+                 BlockDriverCompletionFunc *cb,
+                 void *opaque)
+{
+    IscsiLun *iscsilun = bs->opaque;
+    IscsiAIOCB *acb;
+
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
+    trace_iscsi_aio_writev(iscsilun->iscsi, sector_num, nb_sectors, opaque, 
acb);
+
+    acb->iscsilun    = iscsilun;
+    acb->qiov        = qiov;
+    acb->nb_sectors  = nb_sectors;
+    acb->sector_num  = sector_num;
+    acb->retries     = ISCSI_CMD_RETRIES;
+
+    if (iscsi_aio_writev_acb(acb) != 0) {
+        if (acb->task) {
+            scsi_free_scsi_task(acb->task);
+        }
+        qemu_aio_release(acb);
+        return NULL;
+    }

+    iscsi_set_events(iscsilun);
     return &acb->common;
 }

+static int
+iscsi_aio_readv_acb(IscsiAIOCB *acb);
+
 static void
 iscsi_aio_read16_cb(struct iscsi_context *iscsi, int status,
                     void *command_data, void *opaque)
@@ -326,6 +361,18 @@ iscsi_aio_read16_cb(struct iscsi_context *iscsi, int 
status,

     acb->status = 0;
     if (status != 0) {
+        if (status == SCSI_STATUS_CHECK_CONDITION
+            && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION
+            && acb->retries-- > 0) {
+            if (acb->task != NULL) {
+                scsi_free_scsi_task(acb->task);
+                acb->task = NULL;
+            }
+            if (iscsi_aio_readv_acb(acb) == 0) {
+                iscsi_set_events(acb->iscsilun);
+                return;
+            }
+        }
         error_report("Failed to read16 data from iSCSI lun. %s",
                      iscsi_get_error(iscsi));
         acb->status = -EIO;
@@ -334,35 +381,20 @@ iscsi_aio_read16_cb(struct iscsi_context *iscsi, int 
status,
     iscsi_schedule_bh(acb);
 }

-static BlockDriverAIOCB *
-iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
-                QEMUIOVector *qiov, int nb_sectors,
-                BlockDriverCompletionFunc *cb,
-                void *opaque)
+static int
+iscsi_aio_readv_acb(IscsiAIOCB *acb)
 {
-    IscsiLun *iscsilun = bs->opaque;
-    struct iscsi_context *iscsi = iscsilun->iscsi;
-    IscsiAIOCB *acb;
-    size_t qemu_read_size;
+    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
+    uint64_t lba;
+    uint32_t num_sectors;
+    int ret;
 #if !defined(LIBISCSI_FEATURE_IOVECTOR)
     int i;
 #endif
-    int ret;
-    uint64_t lba;
-    uint32_t num_sectors;
-
-    qemu_read_size = BDRV_SECTOR_SIZE * (size_t)nb_sectors;
-
-    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
-    trace_iscsi_aio_readv(iscsi, sector_num, nb_sectors, opaque, acb);
-
-    acb->iscsilun = iscsilun;
-    acb->qiov     = qiov;

     acb->canceled    = 0;
     acb->bh          = NULL;
     acb->status      = -EINPROGRESS;
-    acb->read_size   = qemu_read_size;
     acb->buf         = NULL;

     /* If LUN blocksize is bigger than BDRV_BLOCK_SIZE a read from QEMU
@@ -370,30 +402,29 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
      * data.
      */
     acb->read_offset = 0;
-    if (iscsilun->block_size > BDRV_SECTOR_SIZE) {
-        uint64_t bdrv_offset = BDRV_SECTOR_SIZE * sector_num;
+    if (acb->iscsilun->block_size > BDRV_SECTOR_SIZE) {
+        uint64_t bdrv_offset = BDRV_SECTOR_SIZE * acb->sector_num;

-        acb->read_offset  = bdrv_offset % iscsilun->block_size;
+        acb->read_offset  = bdrv_offset % acb->iscsilun->block_size;
     }

-    num_sectors  = (qemu_read_size + iscsilun->block_size
+    num_sectors  = (acb->read_size + acb->iscsilun->block_size
                     + acb->read_offset - 1)
-                    / iscsilun->block_size;
+                    / acb->iscsilun->block_size;

     acb->task = malloc(sizeof(struct scsi_task));
     if (acb->task == NULL) {
         error_report("iSCSI: Failed to allocate task for scsi READ16 "
                      "command. %s", iscsi_get_error(iscsi));
-        qemu_aio_release(acb);
-        return NULL;
+        return -1;
     }
     memset(acb->task, 0, sizeof(struct scsi_task));

     acb->task->xfer_dir = SCSI_XFER_READ;
-    lba = sector_qemu2lun(sector_num, iscsilun);
-    acb->task->expxferlen = qemu_read_size;
+    lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
+    acb->task->expxferlen = acb->read_size;

-    switch (iscsilun->type) {
+    switch (acb->iscsilun->type) {
     case TYPE_DISK:
         acb->task->cdb_size = 16;
         acb->task->cdb[0]  = 0x88;
@@ -409,14 +440,12 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
         break;
     }

-    ret = iscsi_scsi_command_async(iscsi, iscsilun->lun, acb->task,
+    ret = iscsi_scsi_command_async(iscsi, acb->iscsilun->lun, acb->task,
                                    iscsi_aio_read16_cb,
                                    NULL,
                                    acb);
     if (ret != 0) {
-        scsi_free_scsi_task(acb->task);
-        qemu_aio_release(acb);
-        return NULL;
+        return -1;
     }

 #if defined(LIBISCSI_FEATURE_IOVECTOR)
@@ -428,12 +457,42 @@ iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
                 acb->qiov->iov[i].iov_base);
     }
 #endif
+    return 0;
+}

-    iscsi_set_events(iscsilun);
+static BlockDriverAIOCB *
+iscsi_aio_readv(BlockDriverState *bs, int64_t sector_num,
+                QEMUIOVector *qiov, int nb_sectors,
+                BlockDriverCompletionFunc *cb,
+                void *opaque)
+{
+    IscsiLun *iscsilun = bs->opaque;
+    IscsiAIOCB *acb;
+
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
+    trace_iscsi_aio_readv(iscsilun->iscsi, sector_num, nb_sectors, opaque, 
acb);
+
+    acb->nb_sectors  = nb_sectors;
+    acb->sector_num  = sector_num;
+    acb->iscsilun    = iscsilun;
+    acb->qiov        = qiov;
+    acb->read_size   = BDRV_SECTOR_SIZE * (size_t)acb->nb_sectors;
+    acb->retries     = ISCSI_CMD_RETRIES;
+
+    if (iscsi_aio_readv_acb(acb) != 0) {
+        if (acb->task) {
+            scsi_free_scsi_task(acb->task);
+        }
+        qemu_aio_release(acb);
+        return NULL;
+    }

+    iscsi_set_events(iscsilun);
     return &acb->common;
 }

+static int
+iscsi_aio_flush_acb(IscsiAIOCB *acb);

 static void
 iscsi_synccache10_cb(struct iscsi_context *iscsi, int status,
@@ -446,7 +505,19 @@ iscsi_synccache10_cb(struct iscsi_context *iscsi, int 
status,
     }

     acb->status = 0;
-    if (status < 0) {
+    if (status != 0) {
+        if (status == SCSI_STATUS_CHECK_CONDITION
+            && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION
+            && acb->retries-- > 0) {
+            if (acb->task != NULL) {
+                scsi_free_scsi_task(acb->task);
+                acb->task = NULL;
+            }
+            if (iscsi_aio_flush_acb(acb) == 0) {
+                iscsi_set_events(acb->iscsilun);
+                return;
+            }
+        }
         error_report("Failed to sync10 data on iSCSI lun. %s",
                      iscsi_get_error(iscsi));
         acb->status = -EIO;
@@ -455,29 +526,43 @@ iscsi_synccache10_cb(struct iscsi_context *iscsi, int 
status,
     iscsi_schedule_bh(acb);
 }

-static BlockDriverAIOCB *
-iscsi_aio_flush(BlockDriverState *bs,
-                BlockDriverCompletionFunc *cb, void *opaque)
+static int
+iscsi_aio_flush_acb(IscsiAIOCB *acb)
 {
-    IscsiLun *iscsilun = bs->opaque;
-    struct iscsi_context *iscsi = iscsilun->iscsi;
-    IscsiAIOCB *acb;
-
-    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
+    struct iscsi_context *iscsi = acb->iscsilun->iscsi;

-    acb->iscsilun = iscsilun;
     acb->canceled   = 0;
     acb->bh         = NULL;
     acb->status     = -EINPROGRESS;
     acb->buf        = NULL;

-    acb->task = iscsi_synchronizecache10_task(iscsi, iscsilun->lun,
+    acb->task = iscsi_synchronizecache10_task(iscsi, acb->iscsilun->lun,
                                          0, 0, 0, 0,
                                          iscsi_synccache10_cb,
                                          acb);
     if (acb->task == NULL) {
         error_report("iSCSI: Failed to send synchronizecache10 command. %s",
                      iscsi_get_error(iscsi));
+        return -1;
+    }
+
+    return 0;
+}
+
+static BlockDriverAIOCB *
+iscsi_aio_flush(BlockDriverState *bs,
+                BlockDriverCompletionFunc *cb, void *opaque)
+{
+    IscsiLun *iscsilun = bs->opaque;
+
+    IscsiAIOCB *acb;
+
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
+
+    acb->iscsilun    = iscsilun;
+    acb->retries     = ISCSI_CMD_RETRIES;
+
+    if (iscsi_aio_flush_acb(acb) != 0) {
         qemu_aio_release(acb);
         return NULL;
     }
@@ -487,6 +572,8 @@ iscsi_aio_flush(BlockDriverState *bs,
     return &acb->common;
 }

+static int iscsi_aio_discard_acb(IscsiAIOCB *acb);
+
 static void
 iscsi_unmap_cb(struct iscsi_context *iscsi, int status,
                      void *command_data, void *opaque)
@@ -498,7 +585,19 @@ iscsi_unmap_cb(struct iscsi_context *iscsi, int status,
     }

     acb->status = 0;
-    if (status < 0) {
+    if (status != 0) {
+        if (status == SCSI_STATUS_CHECK_CONDITION
+            && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION
+            && acb->retries-- > 0) {
+            if (acb->task != NULL) {
+                scsi_free_scsi_task(acb->task);
+                acb->task = NULL;
+            }
+            if (iscsi_aio_discard_acb(acb) == 0) {
+                iscsi_set_events(acb->iscsilun);
+                return;
+            }
+        }
         error_report("Failed to unmap data on iSCSI lun. %s",
                      iscsi_get_error(iscsi));
         acb->status = -EIO;
@@ -507,38 +606,55 @@ iscsi_unmap_cb(struct iscsi_context *iscsi, int status,
     iscsi_schedule_bh(acb);
 }

-static BlockDriverAIOCB *
-iscsi_aio_discard(BlockDriverState *bs,
-                  int64_t sector_num, int nb_sectors,
-                  BlockDriverCompletionFunc *cb, void *opaque)
-{
-    IscsiLun *iscsilun = bs->opaque;
-    struct iscsi_context *iscsi = iscsilun->iscsi;
-    IscsiAIOCB *acb;
+static int iscsi_aio_discard_acb(IscsiAIOCB *acb) {
+    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
     struct unmap_list list[1];
-
-    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
-
-    acb->iscsilun = iscsilun;
+
     acb->canceled   = 0;
     acb->bh         = NULL;
     acb->status     = -EINPROGRESS;
     acb->buf        = NULL;

-    list[0].lba = sector_qemu2lun(sector_num, iscsilun);
-    list[0].num = nb_sectors * BDRV_SECTOR_SIZE / iscsilun->block_size;
+    list[0].lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
+    list[0].num = acb->nb_sectors * BDRV_SECTOR_SIZE / 
acb->iscsilun->block_size;

-    acb->task = iscsi_unmap_task(iscsi, iscsilun->lun,
+    acb->task = iscsi_unmap_task(iscsi, acb->iscsilun->lun,
                                  0, 0, &list[0], 1,
                                  iscsi_unmap_cb,
                                  acb);
     if (acb->task == NULL) {
         error_report("iSCSI: Failed to send unmap command. %s",
                      iscsi_get_error(iscsi));
-        qemu_aio_release(acb);
-        return NULL;
+        return -1;
     }

+    return 0;
+}
+
+static BlockDriverAIOCB *
+iscsi_aio_discard(BlockDriverState *bs,
+                  int64_t sector_num, int nb_sectors,
+                  BlockDriverCompletionFunc *cb, void *opaque)
+{
+    IscsiLun *iscsilun = bs->opaque;
+    IscsiAIOCB *acb;
+
+    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
+
+    acb->iscsilun = iscsilun;
+    acb->retries  = ISCSI_CMD_RETRIES;
+    acb->nb_sectors  = nb_sectors;
+    acb->sector_num  = sector_num;
+    acb->retries     = ISCSI_CMD_RETRIES;
+
+    if (iscsi_aio_discard_acb(acb) != 0) {
+        if (acb->task) {
+            scsi_free_scsi_task(acb->task);
+        }
+        qemu_aio_release(acb);
+        return NULL;
+    }
+
     iscsi_set_events(iscsilun);

     return &acb->common;
--
1.7.9.5



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