[Qemu-devel] [PATCH v3 0/3] scsi-block: Support werror/rerror

[Qemu-devel] [PATCH v3 0/3] scsi-block: Support werror/rerror

[Fam Zheng]

v3: Enhance and reuse iscsi sense data translation. [Paolo]

First refactor and enhance the code in iscsi for sense data translation, then
modify error handing of scsi-block and expose the qdev properties.

Fam Zheng (3):
  scsi: Refactor scsi sense interpreting code
  scsi: Enhance scsi_sense_to_errno
  scsi-block: Support rerror/werror

 MAINTAINERS         |  2 ++
 block/iscsi.c       | 45 ++++----------------------------------------
 hw/scsi/scsi-disk.c | 54 +++++++++++++++++++++++++++++++++++++++--------------
 include/scsi/scsi.h | 19 +++++++++++++++++++
 util/Makefile.objs  |  1 +
 util/scsi.c         | 51 ++++++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 117 insertions(+), 55 deletions(-)
 create mode 100644 include/scsi/scsi.h
 create mode 100644 util/scsi.c

-- 
2.13.4

[Qemu-devel] [PATCH v3 1/3] scsi: Refactor scsi sense interpreting code

[Fam Zheng]

So that it can be reused outside of iscsi.c.

Also update MAINTAINERS to include the new files in SCSI section.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 MAINTAINERS         |  2 ++
 block/iscsi.c       | 45 ++++-----------------------------------------
 include/scsi/scsi.h | 19 +++++++++++++++++++
 util/Makefile.objs  |  1 +
 util/scsi.c         | 52 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 78 insertions(+), 41 deletions(-)
 create mode 100644 include/scsi/scsi.h
 create mode 100644 util/scsi.c

diff --git a/MAINTAINERS b/MAINTAINERS
index ccee28b12d..2a4e5036ae 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -969,7 +969,9 @@ SCSI
 M: Paolo Bonzini <pbonzini@redhat.com>
 S: Supported
 F: include/hw/scsi/*
+F: include/scsi/*
 F: hw/scsi/*
+F: util/scsi*
 F: tests/virtio-scsi-test.c
 T: git git://github.com/bonzini/qemu.git scsi-next
 
diff --git a/block/iscsi.c b/block/iscsi.c
index d557c99668..4bed63cd6d 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -40,6 +40,7 @@
 #include "qmp-commands.h"
 #include "qapi/qmp/qstring.h"
 #include "crypto/secret.h"
+#include "scsi/scsi.h"
 
 #include <iscsi/iscsi.h>
 #include <iscsi/scsi-lowlevel.h>
@@ -209,47 +210,9 @@ static inline unsigned exp_random(double mean)
 
 static int iscsi_translate_sense(struct scsi_sense *sense)
 {
-    int ret;
-
-    switch (sense->key) {
-    case SCSI_SENSE_NOT_READY:
-        return -EBUSY;
-    case SCSI_SENSE_DATA_PROTECTION:
-        return -EACCES;
-    case SCSI_SENSE_COMMAND_ABORTED:
-        return -ECANCELED;
-    case SCSI_SENSE_ILLEGAL_REQUEST:
-        /* Parse ASCQ */
-        break;
-    default:
-        return -EIO;
-    }
-    switch (sense->ascq) {
-    case SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR:
-    case SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE:
-    case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB:
-    case SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST:
-        ret = -EINVAL;
-        break;
-    case SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE:
-        ret = -ENOSPC;
-        break;
-    case SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED:
-        ret = -ENOTSUP;
-        break;
-    case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT:
-    case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED:
-    case SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN:
-        ret = -ENOMEDIUM;
-        break;
-    case SCSI_SENSE_ASCQ_WRITE_PROTECTED:
-        ret = -EACCES;
-        break;
-    default:
-        ret = -EIO;
-        break;
-    }
-    return ret;
+    return - scsi_sense_to_errno(sense->key,
+                                 (sense->ascq & 0xFF00) >> 8,
+                                 sense->ascq & 0xFF);
 }
 
 /* Called (via iscsi_service) with QemuMutex held.  */
diff --git a/include/scsi/scsi.h b/include/scsi/scsi.h
new file mode 100644
index 0000000000..f894ace4bf
--- /dev/null
+++ b/include/scsi/scsi.h
@@ -0,0 +1,19 @@
+/*
+ *  SCSI helpers
+ *
+ *  Copyright 2017 Red Hat, Inc.
+ *
+ *  Authors:
+ *   Fam Zheng <famz@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+#ifndef QEMU_SCSI_H
+#define QEMU_SCSI_H
+
+int scsi_sense_to_errno(int key, int asc, int ascq);
+
+#endif
diff --git a/util/Makefile.objs b/util/Makefile.objs
index 50a55ecc75..c9e6c493d3 100644
--- a/util/Makefile.objs
+++ b/util/Makefile.objs
@@ -45,3 +45,4 @@ util-obj-y += qht.o
 util-obj-y += range.o
 util-obj-y += stats64.o
 util-obj-y += systemd.o
+util-obj-y += scsi.o
diff --git a/util/scsi.c b/util/scsi.c
new file mode 100644
index 0000000000..92ca436cd0
--- /dev/null
+++ b/util/scsi.c
@@ -0,0 +1,52 @@
+/*
+ *  SCSI helpers
+ *
+ *  Copyright 2017 Red Hat, Inc.
+ *
+ *  Authors:
+ *   Fam Zheng <famz@redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ */
+
+#include "qemu/osdep.h"
+#include "scsi/scsi.h"
+
+int scsi_sense_to_errno(int key, int asc, int ascq)
+{
+    switch (key) {
+    case 0x02: /* SCSI_SENSE_NOT_READY */
+        return EBUSY;
+    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
+        return EACCES;
+    case 0x0b: /* SCSI_SENSE_COMMAND_ABORTED */
+        return ECANCELED;
+    case 0x05: /* SCSI_SENSE_ILLEGAL_REQUEST */
+        /* Parse ASCQ */
+        break;
+    default:
+        return EIO;
+    }
+    switch ((asc << 8) | ascq) {
+    case 0x1a00: /* SCSI_SENSE_ASCQ_PARAMETER_LIST_LENGTH_ERROR */
+    case 0x2000: /* SCSI_SENSE_ASCQ_INVALID_OPERATION_CODE */
+    case 0x2400: /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_CDB */
+    case 0x2600: /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST */
+        return EINVAL;
+    case 0x2100: /* SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE */
+        return ENOSPC;
+    case 0x2500: /* SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED */
+        return ENOTSUP;
+    case 0x3a00: /* SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT */
+    case 0x3a01: /* SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_CLOSED */
+    case 0x3a02: /* SCSI_SENSE_ASCQ_MEDIUM_NOT_PRESENT_TRAY_OPEN */
+        return ENOMEDIUM;
+    case 0x2700: /* SCSI_SENSE_ASCQ_WRITE_PROTECTED */
+        return EACCES;
+    default:
+        return EIO;
+    }
+}
-- 
2.13.4

[Qemu-devel] [PATCH v3 2/3] scsi: Enhance scsi_sense_to_errno

[Fam Zheng]

Two changes:

1) Look at asc/ascq for NOT_READY and DATA_PROTECT;
2) Translate SPACE_ALLOC_FAILED as ENOSPC;

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 util/scsi.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/util/scsi.c b/util/scsi.c
index 92ca436cd0..d42ce33449 100644
--- a/util/scsi.c
+++ b/util/scsi.c
@@ -18,13 +18,11 @@
 int scsi_sense_to_errno(int key, int asc, int ascq)
 {
     switch (key) {
-    case 0x02: /* SCSI_SENSE_NOT_READY */
-        return EBUSY;
-    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
-        return EACCES;
     case 0x0b: /* SCSI_SENSE_COMMAND_ABORTED */
         return ECANCELED;
+    case 0x02: /* SCSI_SENSE_NOT_READY */
     case 0x05: /* SCSI_SENSE_ILLEGAL_REQUEST */
+    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
         /* Parse ASCQ */
         break;
     default:
@@ -37,6 +35,7 @@ int scsi_sense_to_errno(int key, int asc, int ascq)
     case 0x2600: /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST */
         return EINVAL;
     case 0x2100: /* SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE */
+    case 0x2707: /* SCSI_SENSE_ASCQ_SPACE_ALLOC_FAILED */
         return ENOSPC;
     case 0x2500: /* SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED */
         return ENOTSUP;
-- 
2.13.4

[Qemu-devel] [PATCH v3 3/3] scsi-block: Support rerror/werror

[Fam Zheng]

This makes the werror/rerror options available on the scsi-block device,
to allow user specify error handling policy similar to scsi-hd.

Signed-off-by: Fam Zheng <famz@redhat.com>
---
 hw/scsi/scsi-disk.c | 54 +++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 40 insertions(+), 14 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 5f1e5e8070..ec7dbe4a2d 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -39,6 +39,7 @@ do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
 #include "hw/block/block.h"
 #include "sysemu/dma.h"
 #include "qemu/cutils.h"
+#include "scsi/scsi.h"
 
 #ifdef __linux
 #include <scsi/sg.h>
@@ -106,7 +107,7 @@ typedef struct SCSIDiskState
     bool tray_locked;
 } SCSIDiskState;
 
-static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed);
+static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed);
 
 static void scsi_free_request(SCSIRequest *req)
 {
@@ -184,19 +185,10 @@ static bool scsi_disk_req_check_error(SCSIDiskReq *r, int ret, bool acct_failed)
         return true;
     }
 
-    if (ret < 0) {
+    if (ret < 0 || (r->status && *r->status)) {
         return scsi_handle_rw_error(r, -ret, acct_failed);
     }
 
-    if (r->status && *r->status) {
-        if (acct_failed) {
-            SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
-            block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct);
-        }
-        scsi_req_complete(&r->req, *r->status);
-        return true;
-    }
-
     return false;
 }
 
@@ -422,13 +414,13 @@ static void scsi_read_data(SCSIRequest *req)
 }
 
 /*
- * scsi_handle_rw_error has two return values.  0 means that the error
- * must be ignored, 1 means that the error has been processed and the
+ * scsi_handle_rw_error has two return values.  False means that the error
+ * must be ignored, true means that the error has been processed and the
  * caller should not do anything else for this request.  Note that
  * scsi_handle_rw_error always manages its reference counts, independent
  * of the return value.
  */
-static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
+static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
 {
     bool is_read = (r->req.cmd.mode == SCSI_XFER_FROM_DEV);
     SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
@@ -440,6 +432,11 @@ static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
             block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct);
         }
         switch (error) {
+        case 0:
+            /* The command has run, no need to fake sense.  */
+            assert(r->status && *r->status);
+            scsi_req_complete(&r->req, *r->status);
+            break;
         case ENOMEDIUM:
             scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));
             break;
@@ -457,6 +454,34 @@ static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
             break;
         }
     }
+    if (!error) {
+        int key, asc, ascq;
+        assert(r->status && *r->status);
+        switch (r->req.sense[0]) {
+        case 0x70: /* Fixed format sense data. */
+            key = r->req.sense[2] & 0xF;
+            asc = r->req.sense[12];
+            ascq = r->req.sense[13];
+            error = scsi_sense_to_errno(key, asc, ascq);
+            break;
+        case 0x72: /* Descriptor format sense data. */
+            key = r->req.sense[1] & 0xF;
+            asc = r->req.sense[2];
+            ascq = r->req.sense[3];
+            error = scsi_sense_to_errno(key, asc, ascq);
+            break;
+        default:
+            error = EIO;
+            break;
+        }
+
+        if (error == ECANCELED) {
+            /* Command aborted shouldn't stop the VM. */
+            scsi_req_complete(&r->req, *r->status);
+            return true;
+        }
+    }
+
     blk_error_action(s->qdev.conf.blk, action, is_read, error);
     if (action == BLOCK_ERROR_ACTION_STOP) {
         scsi_req_retry(&r->req);
@@ -2972,6 +2997,7 @@ static const TypeInfo scsi_cd_info = {
 
 #ifdef __linux__
 static Property scsi_block_properties[] = {
+    DEFINE_BLOCK_ERROR_PROPERTIES(SCSIDiskState, qdev.conf),         \
     DEFINE_PROP_DRIVE("drive", SCSIDiskState, qdev.conf.blk),
     DEFINE_PROP_END_OF_LIST(),
 };
-- 
2.13.4

Re: [Qemu-devel] [PATCH v3 2/3] scsi: Enhance scsi_sense_to_errno

[Paolo Bonzini]

On 18/08/2017 16:15, Fam Zheng wrote:
> Two changes:
> 
> 1) Look at asc/ascq for NOT_READY and DATA_PROTECT;
> 2) Translate SPACE_ALLOC_FAILED as ENOSPC;
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  util/scsi.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/util/scsi.c b/util/scsi.c
> index 92ca436cd0..d42ce33449 100644
> --- a/util/scsi.c
> +++ b/util/scsi.c
> @@ -18,13 +18,11 @@
>  int scsi_sense_to_errno(int key, int asc, int ascq)
>  {
>      switch (key) {
> -    case 0x02: /* SCSI_SENSE_NOT_READY */
> -        return EBUSY;
> -    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
> -        return EACCES;
>      case 0x0b: /* SCSI_SENSE_COMMAND_ABORTED */
>          return ECANCELED;
> +    case 0x02: /* SCSI_SENSE_NOT_READY */
>      case 0x05: /* SCSI_SENSE_ILLEGAL_REQUEST */
> +    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
>          /* Parse ASCQ */
>          break;
>      default:

UNIT_ATTENTION should also be passed down to the guest without stopping
the VM.  Maybe map it to EAGAIN?

Looking at what Linux does:

- RECOVERED_ERROR should just return 0

- 0x0401 is "unit in the process of becoming ready", and it should also
be EAGAIN

- 0x0402 is "initializing command required", and probably can be fixed
by the guest by scsi-block but not by iscsi so it should be its own
errno, maybe ENOTCONN?  (iscsi might try sending START STOP UNIT
followed by a bunch of TEST UNIT READYs, see scsi_eh_try_stu in Linux's
drivers/scsi/scsi_error.c).

Paolo

> @@ -37,6 +35,7 @@ int scsi_sense_to_errno(int key, int asc, int ascq)
>      case 0x2600: /* SCSI_SENSE_ASCQ_INVALID_FIELD_IN_PARAMETER_LIST */
>          return EINVAL;
>      case 0x2100: /* SCSI_SENSE_ASCQ_LBA_OUT_OF_RANGE */
> +    case 0x2707: /* SCSI_SENSE_ASCQ_SPACE_ALLOC_FAILED */
>          return ENOSPC;
>      case 0x2500: /* SCSI_SENSE_ASCQ_LOGICAL_UNIT_NOT_SUPPORTED */
>          return ENOTSUP;
> 

Re: [Qemu-devel] [PATCH v3 3/3] scsi-block: Support rerror/werror

[Paolo Bonzini]

On 18/08/2017 16:15, Fam Zheng wrote:
> This makes the werror/rerror options available on the scsi-block device,
> to allow user specify error handling policy similar to scsi-hd.
> 
> Signed-off-by: Fam Zheng <famz@redhat.com>
> ---
>  hw/scsi/scsi-disk.c | 54 +++++++++++++++++++++++++++++++++++++++--------------
>  1 file changed, 40 insertions(+), 14 deletions(-)
> 
> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
> index 5f1e5e8070..ec7dbe4a2d 100644
> --- a/hw/scsi/scsi-disk.c
> +++ b/hw/scsi/scsi-disk.c
> @@ -39,6 +39,7 @@ do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
>  #include "hw/block/block.h"
>  #include "sysemu/dma.h"
>  #include "qemu/cutils.h"
> +#include "scsi/scsi.h"
>  
>  #ifdef __linux
>  #include <scsi/sg.h>
> @@ -106,7 +107,7 @@ typedef struct SCSIDiskState
>      bool tray_locked;
>  } SCSIDiskState;
>  
> -static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed);
> +static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed);
>  
>  static void scsi_free_request(SCSIRequest *req)
>  {
> @@ -184,19 +185,10 @@ static bool scsi_disk_req_check_error(SCSIDiskReq *r, int ret, bool acct_failed)
>          return true;
>      }
>  
> -    if (ret < 0) {
> +    if (ret < 0 || (r->status && *r->status)) {
>          return scsi_handle_rw_error(r, -ret, acct_failed);
>      }
>  
> -    if (r->status && *r->status) {
> -        if (acct_failed) {
> -            SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
> -            block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct);
> -        }
> -        scsi_req_complete(&r->req, *r->status);
> -        return true;
> -    }
> -
>      return false;
>  }
>  
> @@ -422,13 +414,13 @@ static void scsi_read_data(SCSIRequest *req)
>  }
>  
>  /*
> - * scsi_handle_rw_error has two return values.  0 means that the error
> - * must be ignored, 1 means that the error has been processed and the
> + * scsi_handle_rw_error has two return values.  False means that the error
> + * must be ignored, true means that the error has been processed and the
>   * caller should not do anything else for this request.  Note that
>   * scsi_handle_rw_error always manages its reference counts, independent
>   * of the return value.
>   */
> -static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
> +static bool scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
>  {
>      bool is_read = (r->req.cmd.mode == SCSI_XFER_FROM_DEV);
>      SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
> @@ -440,6 +432,11 @@ static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
>              block_acct_failed(blk_get_stats(s->qdev.conf.blk), &r->acct);
>          }
>          switch (error) {
> +        case 0:
> +            /* The command has run, no need to fake sense.  */
> +            assert(r->status && *r->status);
> +            scsi_req_complete(&r->req, *r->status);
> +            break;
>          case ENOMEDIUM:
>              scsi_check_condition(r, SENSE_CODE(NO_MEDIUM));
>              break;
> @@ -457,6 +454,34 @@ static int scsi_handle_rw_error(SCSIDiskReq *r, int error, bool acct_failed)
>              break;
>          }
>      }
> +    if (!error) {
> +        int key, asc, ascq;
> +        assert(r->status && *r->status);
> +        switch (r->req.sense[0]) {
> +        case 0x70: /* Fixed format sense data. */
> +            key = r->req.sense[2] & 0xF;
> +            asc = r->req.sense[12];
> +            ascq = r->req.sense[13];
> +            error = scsi_sense_to_errno(key, asc, ascq);
> +            break;
> +        case 0x72: /* Descriptor format sense data. */
> +            key = r->req.sense[1] & 0xF;
> +            asc = r->req.sense[2];
> +            ascq = r->req.sense[3];
> +            error = scsi_sense_to_errno(key, asc, ascq);
> +            break;
> +        default:
> +            error = EIO;
> +            break;
> +        }

Maybe this switch statement should also be a function in util/iscsi.c
(scsi_sense_buf_to_errno)?
> +
> +        if (error == ECANCELED) {

... || error == EAGAIN || error == ENOTCONN || error == 0

?

> +            /* Command aborted shouldn't stop the VM. */
> +            scsi_req_complete(&r->req, *r->status);
> +            return true;
> +        }
> +    }
> +
>      blk_error_action(s->qdev.conf.blk, action, is_read, error);
>      if (action == BLOCK_ERROR_ACTION_STOP) {
>          scsi_req_retry(&r->req);
> @@ -2972,6 +2997,7 @@ static const TypeInfo scsi_cd_info = {
>  
>  #ifdef __linux__
>  static Property scsi_block_properties[] = {
> +    DEFINE_BLOCK_ERROR_PROPERTIES(SCSIDiskState, qdev.conf),         \
>      DEFINE_PROP_DRIVE("drive", SCSIDiskState, qdev.conf.blk),
>      DEFINE_PROP_END_OF_LIST(),
>  };
> 

Re: [Qemu-devel] [PATCH v3 0/3] scsi-block: Support werror/rerror

[no-reply]

Hi,

This series seems to have some coding style problems. See output below for
more information:

Type: series
Message-id: 20170818141512.15205-1-famz@redhat.com
Subject: [Qemu-devel] [PATCH v3 0/3] scsi-block: Support werror/rerror

=== TEST SCRIPT BEGIN ===
#!/bin/bash

BASE=base
n=1
total=$(git log --oneline $BASE.. | wc -l)
failed=0

git config --local diff.renamelimit 0
git config --local diff.renames True

commits="$(git log --format=%H --reverse $BASE..)"
for c in $commits; do
    echo "Checking PATCH $n/$total: $(git log -n 1 --format=%s $c)..."
    if ! git show $c --format=email | ./scripts/checkpatch.pl --mailback -; then
        failed=1
        echo
    fi
    n=$((n+1))
done

exit $failed
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
 * [new tag]               patchew/1503065708-28277-1-git-send-email-mark.cave-ayland@ilande.co.uk -> patchew/1503065708-28277-1-git-send-email-mark.cave-ayland@ilande.co.uk
Switched to a new branch 'test'
5097d927de scsi-block: Support rerror/werror
d2c536a47c scsi: Enhance scsi_sense_to_errno
17642e9a8e scsi: Refactor scsi sense interpreting code

=== OUTPUT BEGIN ===
Checking PATCH 1/3: scsi: Refactor scsi sense interpreting code...
ERROR: space prohibited after that '-' (ctx:WxW)
#84: FILE: block/iscsi.c:213:
+    return - scsi_sense_to_errno(sense->key,
            ^

ERROR: return of an errno should typically be -ve (return -EBUSY)
#151: FILE: util/scsi.c:22:
+        return EBUSY;

ERROR: return of an errno should typically be -ve (return -EACCES)
#153: FILE: util/scsi.c:24:
+        return EACCES;

ERROR: return of an errno should typically be -ve (return -ECANCELED)
#155: FILE: util/scsi.c:26:
+        return ECANCELED;

ERROR: return of an errno should typically be -ve (return -EIO)
#160: FILE: util/scsi.c:31:
+        return EIO;

ERROR: return of an errno should typically be -ve (return -EINVAL)
#167: FILE: util/scsi.c:38:
+        return EINVAL;

ERROR: return of an errno should typically be -ve (return -ENOSPC)
#169: FILE: util/scsi.c:40:
+        return ENOSPC;

ERROR: return of an errno should typically be -ve (return -ENOTSUP)
#171: FILE: util/scsi.c:42:
+        return ENOTSUP;

ERROR: return of an errno should typically be -ve (return -ENOMEDIUM)
#175: FILE: util/scsi.c:46:
+        return ENOMEDIUM;

ERROR: return of an errno should typically be -ve (return -EACCES)
#177: FILE: util/scsi.c:48:
+        return EACCES;

ERROR: return of an errno should typically be -ve (return -EIO)
#179: FILE: util/scsi.c:50:
+        return EIO;

total: 11 errors, 0 warnings, 141 lines checked

Your patch has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

Checking PATCH 2/3: scsi: Enhance scsi_sense_to_errno...
Checking PATCH 3/3: scsi-block: Support rerror/werror...
=== OUTPUT END ===

Test command exited with code: 1


---
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Please send your feedback to patchew-devel@freelists.org

Re: [Qemu-devel] [PATCH v3 2/3] scsi: Enhance scsi_sense_to_errno

[Fam Zheng]

On Fri, 08/18 16:36, Paolo Bonzini wrote:
> On 18/08/2017 16:15, Fam Zheng wrote:
> > Two changes:
> > 
> > 1) Look at asc/ascq for NOT_READY and DATA_PROTECT;
> > 2) Translate SPACE_ALLOC_FAILED as ENOSPC;
> > 
> > Signed-off-by: Fam Zheng <famz@redhat.com>
> > ---
> >  util/scsi.c | 7 +++----
> >  1 file changed, 3 insertions(+), 4 deletions(-)
> > 
> > diff --git a/util/scsi.c b/util/scsi.c
> > index 92ca436cd0..d42ce33449 100644
> > --- a/util/scsi.c
> > +++ b/util/scsi.c
> > @@ -18,13 +18,11 @@
> >  int scsi_sense_to_errno(int key, int asc, int ascq)
> >  {
> >      switch (key) {
> > -    case 0x02: /* SCSI_SENSE_NOT_READY */
> > -        return EBUSY;
> > -    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
> > -        return EACCES;
> >      case 0x0b: /* SCSI_SENSE_COMMAND_ABORTED */
> >          return ECANCELED;
> > +    case 0x02: /* SCSI_SENSE_NOT_READY */
> >      case 0x05: /* SCSI_SENSE_ILLEGAL_REQUEST */
> > +    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
> >          /* Parse ASCQ */
> >          break;
> >      default:
> 
> UNIT_ATTENTION should also be passed down to the guest without stopping
> the VM.  Maybe map it to EAGAIN?

Or just 0?

> 
> Looking at what Linux does:
> 
> - RECOVERED_ERROR should just return 0
> 
> - 0x0401 is "unit in the process of becoming ready", and it should also
> be EAGAIN
> 
> - 0x0402 is "initializing command required", and probably can be fixed
> by the guest by scsi-block but not by iscsi so it should be its own
> errno, maybe ENOTCONN?  (iscsi might try sending START STOP UNIT
> followed by a bunch of TEST UNIT READYs, see scsi_eh_try_stu in Linux's
> drivers/scsi/scsi_error.c).

These makes sense to me.

Fam

Re: [Qemu-devel] [PATCH v3 2/3] scsi: Enhance scsi_sense_to_errno

[Paolo Bonzini]

On 21/08/2017 13:11, Fam Zheng wrote:
> On Fri, 08/18 16:36, Paolo Bonzini wrote:
>> On 18/08/2017 16:15, Fam Zheng wrote:
>>> Two changes:
>>>
>>> 1) Look at asc/ascq for NOT_READY and DATA_PROTECT;
>>> 2) Translate SPACE_ALLOC_FAILED as ENOSPC;
>>>
>>> Signed-off-by: Fam Zheng <famz@redhat.com>
>>> ---
>>>  util/scsi.c | 7 +++----
>>>  1 file changed, 3 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/util/scsi.c b/util/scsi.c
>>> index 92ca436cd0..d42ce33449 100644
>>> --- a/util/scsi.c
>>> +++ b/util/scsi.c
>>> @@ -18,13 +18,11 @@
>>>  int scsi_sense_to_errno(int key, int asc, int ascq)
>>>  {
>>>      switch (key) {
>>> -    case 0x02: /* SCSI_SENSE_NOT_READY */
>>> -        return EBUSY;
>>> -    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
>>> -        return EACCES;
>>>      case 0x0b: /* SCSI_SENSE_COMMAND_ABORTED */
>>>          return ECANCELED;
>>> +    case 0x02: /* SCSI_SENSE_NOT_READY */
>>>      case 0x05: /* SCSI_SENSE_ILLEGAL_REQUEST */
>>> +    case 0x07: /* SCSI_SENSE_DATA_PROTECTION */
>>>          /* Parse ASCQ */
>>>          break;
>>>      default:
>>
>> UNIT_ATTENTION should also be passed down to the guest without stopping
>> the VM.  Maybe map it to EAGAIN?
> 
> Or just 0?

That works too, it depends on how you define 0.  1h is defined as
informational only and can be dropped, 0x0401 or UNIT_ATTENTION
definitely cannot.

Paolo

>>
>> Looking at what Linux does:
>>
>> - RECOVERED_ERROR should just return 0
>>
>> - 0x0401 is "unit in the process of becoming ready", and it should also
>> be EAGAIN
>>
>> - 0x0402 is "initializing command required", and probably can be fixed
>> by the guest by scsi-block but not by iscsi so it should be its own
>> errno, maybe ENOTCONN?  (iscsi might try sending START STOP UNIT
>> followed by a bunch of TEST UNIT READYs, see scsi_eh_try_stu in Linux's
>> drivers/scsi/scsi_error.c).
> 
> These makes sense to me.
> 
> Fam
>