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Blame SOURCES/kvm-iscsi-split-discard-requests-in-multiple-parts.patch.patch.patch

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From 2865e534fce4969a316a5ba764b65e540da08cee Mon Sep 17 00:00:00 2001
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Message-Id: <2865e534fce4969a316a5ba764b65e540da08cee.1389014116.git.minovotn@redhat.com>
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In-Reply-To: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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References: <c8cc35838d42aa286242772d97e3a9be7bb786ba.1389014116.git.minovotn@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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Date: Mon, 9 Dec 2013 14:08:53 +0100
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Subject: [PATCH 05/50] iscsi: split discard requests in multiple parts
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RH-Author: Paolo Bonzini <pbonzini@redhat.com>
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Message-id: <1386598178-11845-8-git-send-email-pbonzini@redhat.com>
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Patchwork-id: 56044
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O-Subject: [RHEL 7.0 qemu-kvm PATCH 07/52] iscsi: split discard requests in multiple parts
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Bugzilla: 1007815
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RH-Acked-by: Jeffrey Cody <jcody@redhat.com>
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RH-Acked-by: Fam Zheng <famz@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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From: Peter Lieven <pl@kamp.de>
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Replace .bdrv_aio_discard with .bdrv_co_discard so that discard
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requests can be split in multiple parts, each for a small amount
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of sectors.
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This is useful because we expose a generic API with no limit
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on the amount of sectors that can be unmapped in one request.
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Signed-off-by: Peter Lieven <pl@kamp.de>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit 65f3e33964bc4bb634d61463814a4ccca794e3c0)
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---
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 block/iscsi.c | 156 +++++++++++++++++++++++++++-------------------------------
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 1 file changed, 73 insertions(+), 83 deletions(-)
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Signed-off-by: Michal Novotny <minovotn@redhat.com>
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---
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 block/iscsi.c | 156 +++++++++++++++++++++++++++-------------------------------
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 1 file changed, 73 insertions(+), 83 deletions(-)
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diff --git a/block/iscsi.c b/block/iscsi.c
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index f8d021a..3a34eb7 100644
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--- a/block/iscsi.c
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+++ b/block/iscsi.c
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@@ -87,6 +87,7 @@ typedef struct IscsiAIOCB {
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 #define NOP_INTERVAL 5000
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 #define MAX_NOP_FAILURES 3
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 #define ISCSI_CMD_RETRIES 5
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+#define ISCSI_MAX_UNMAP 131072
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 static void
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 iscsi_bh_cb(void *p)
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@@ -624,88 +625,6 @@ iscsi_aio_flush(BlockDriverState *bs,
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     return &acb->common;
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 }
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-static int iscsi_aio_discard_acb(IscsiAIOCB *acb);
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-
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-static void
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-iscsi_unmap_cb(struct iscsi_context *iscsi, int status,
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-                     void *command_data, void *opaque)
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-{
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-    IscsiAIOCB *acb = opaque;
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-
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-    if (acb->canceled != 0) {
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-        return;
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-    }
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-
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-    acb->status = 0;
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-    if (status != 0) {
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-        if (status == SCSI_STATUS_CHECK_CONDITION
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-            && acb->task->sense.key == SCSI_SENSE_UNIT_ATTENTION
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-            && acb->retries-- > 0) {
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-            scsi_free_scsi_task(acb->task);
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-            acb->task = NULL;
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-            if (iscsi_aio_discard_acb(acb) == 0) {
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-                iscsi_set_events(acb->iscsilun);
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-                return;
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-            }
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-        }
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-        error_report("Failed to unmap data on iSCSI lun. %s",
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-                     iscsi_get_error(iscsi));
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-        acb->status = -EIO;
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-    }
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-
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-    iscsi_schedule_bh(acb);
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-}
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-
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-static int iscsi_aio_discard_acb(IscsiAIOCB *acb) {
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-    struct iscsi_context *iscsi = acb->iscsilun->iscsi;
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-    struct unmap_list list[1];
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-
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-    acb->canceled   = 0;
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-    acb->bh         = NULL;
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-    acb->status     = -EINPROGRESS;
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-    acb->buf        = NULL;
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-
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-    list[0].lba = sector_qemu2lun(acb->sector_num, acb->iscsilun);
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-    list[0].num = acb->nb_sectors * BDRV_SECTOR_SIZE / acb->iscsilun->block_size;
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-
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-    acb->task = iscsi_unmap_task(iscsi, acb->iscsilun->lun,
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-                                 0, 0, &list[0], 1,
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-                                 iscsi_unmap_cb,
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-                                 acb);
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-    if (acb->task == NULL) {
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-        error_report("iSCSI: Failed to send unmap command. %s",
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-                     iscsi_get_error(iscsi));
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-        return -1;
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-    }
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-
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-    return 0;
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-}
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-
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-static BlockDriverAIOCB *
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-iscsi_aio_discard(BlockDriverState *bs,
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-                  int64_t sector_num, int nb_sectors,
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-                  BlockDriverCompletionFunc *cb, void *opaque)
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-{
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-    IscsiLun *iscsilun = bs->opaque;
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-    IscsiAIOCB *acb;
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-
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-    acb = qemu_aio_get(&iscsi_aiocb_info, bs, cb, opaque);
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-
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-    acb->iscsilun    = iscsilun;
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-    acb->nb_sectors  = nb_sectors;
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-    acb->sector_num  = sector_num;
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-    acb->retries     = ISCSI_CMD_RETRIES;
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-
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-    if (iscsi_aio_discard_acb(acb) != 0) {
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-        qemu_aio_release(acb);
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-        return NULL;
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-    }
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-
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-    iscsi_set_events(iscsilun);
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-
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-    return &acb->common;
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-}
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-
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 #ifdef __linux__
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 static void
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 iscsi_aio_ioctl_cb(struct iscsi_context *iscsi, int status,
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@@ -988,6 +907,77 @@ out:
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     return ret;
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 }
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+static int
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+coroutine_fn iscsi_co_discard(BlockDriverState *bs, int64_t sector_num,
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+                                   int nb_sectors)
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+{
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+    IscsiLun *iscsilun = bs->opaque;
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+    struct IscsiTask iTask;
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+    struct unmap_list list;
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+    uint32_t nb_blocks;
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+    uint32_t max_unmap;
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+
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+    if (!is_request_lun_aligned(sector_num, nb_sectors, iscsilun)) {
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+        return -EINVAL;
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+    }
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+
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+    if (!iscsilun->lbp.lbpu) {
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+        /* UNMAP is not supported by the target */
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+        return 0;
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+    }
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+
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+    list.lba = sector_qemu2lun(sector_num, iscsilun);
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+    nb_blocks = sector_qemu2lun(nb_sectors, iscsilun);
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+
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+    max_unmap = iscsilun->bl.max_unmap;
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+    if (max_unmap == 0xffffffff) {
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+        max_unmap = ISCSI_MAX_UNMAP;
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+    }
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+
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+    while (nb_blocks > 0) {
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+        iscsi_co_init_iscsitask(iscsilun, &iTask);
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+        list.num = nb_blocks;
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+        if (list.num > max_unmap) {
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+            list.num = max_unmap;
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+        }
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+retry:
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+        if (iscsi_unmap_task(iscsilun->iscsi, iscsilun->lun, 0, 0, &list, 1,
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+                         iscsi_co_generic_cb, &iTask) == NULL) {
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+            return -EIO;
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+        }
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+
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+        while (!iTask.complete) {
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+            iscsi_set_events(iscsilun);
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+            qemu_coroutine_yield();
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+        }
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+
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+        if (iTask.task != NULL) {
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+            scsi_free_scsi_task(iTask.task);
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+            iTask.task = NULL;
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+        }
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+
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+        if (iTask.do_retry) {
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+            goto retry;
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+        }
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+
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+        if (iTask.status == SCSI_STATUS_CHECK_CONDITION) {
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+            /* the target might fail with a check condition if it
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+               is not happy with the alignment of the UNMAP request
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+               we silently fail in this case */
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+            return 0;
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+        }
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+
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+        if (iTask.status != SCSI_STATUS_GOOD) {
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+            return -EIO;
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+        }
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+
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+        list.lba += list.num;
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+        nb_blocks -= list.num;
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+    }
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+
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+    return 0;
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+}
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+
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 static int parse_chap(struct iscsi_context *iscsi, const char *target)
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 {
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     QemuOptsList *list;
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@@ -1541,12 +1531,12 @@ static BlockDriver bdrv_iscsi = {
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     .bdrv_truncate   = iscsi_truncate,
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     .bdrv_co_get_block_status = iscsi_co_get_block_status,
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+    .bdrv_co_discard      = iscsi_co_discard,
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     .bdrv_aio_readv  = iscsi_aio_readv,
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     .bdrv_aio_writev = iscsi_aio_writev,
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     .bdrv_aio_flush  = iscsi_aio_flush,
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-    .bdrv_aio_discard = iscsi_aio_discard,
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     .bdrv_has_zero_init = iscsi_has_zero_init,
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 #ifdef __linux__
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-- 
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1.7.11.7
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