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Carl-Daniel Hailfinger

2016-Sep-26 16:00 UTC

[Libguestfs] [PATCH] nbdkit: flags are 32 bits for oldstyle connections

# HG changeset patch
# User Carl-Daniel Hailfinger <Carl-Daniel.Hailfinger@inf.h-brs.de>
# Date 1474903734 -7200
#      Mon Sep 26 17:28:54 2016 +0200
# Node ID dbd1ea0a401cedcfa426097a289d852971b14f1e
# Parent  d7d5078d08c711032837dcac79a4450226ec2ce5
nbdkit: Fix flags in old-style connection

diff -r d7d5078d08c7 -r dbd1ea0a401c src/connections.c
--- a/src/connections.c	Sun Sep 25 05:04:02 2016 +0200
+++ b/src/connections.c	Mon Sep 26 17:28:54 2016 +0200
@@ -155,7 +155,7 @@
   struct old_handshake handshake;
   int64_t r;
   uint64_t exportsize;
-  uint16_t gflags, eflags;
+  uint32_t flags;
   int fl;
 
   r = plugin_get_size (conn);
@@ -169,14 +169,13 @@
   exportsize = (uint64_t) r;
   conn->exportsize = exportsize;
 
-  gflags = 0;
-  eflags = NBD_FLAG_HAS_FLAGS;
+  flags = NBD_FLAG_HAS_FLAGS;
 
   fl = plugin_can_write (conn);
   if (fl == -1)
     return -1;
   if (readonly || !fl) {
-    eflags |= NBD_FLAG_READ_ONLY;
+    flags |= NBD_FLAG_READ_ONLY;
     conn->readonly = 1;
   }
 
@@ -184,7 +183,7 @@
   if (fl == -1)
     return -1;
   if (fl) {
-    eflags |= NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA;
+    flags |= NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA;
     conn->can_flush = 1;
   }
 
@@ -192,7 +191,7 @@
   if (fl == -1)
     return -1;
   if (fl) {
-    eflags |= NBD_FLAG_ROTATIONAL;
+    flags |= NBD_FLAG_ROTATIONAL;
     conn->is_rotational = 1;
   }
 
@@ -200,7 +199,7 @@
   if (fl == -1)
     return -1;
   if (fl) {
-    eflags |= NBD_FLAG_SEND_TRIM;
+    flags |= NBD_FLAG_SEND_TRIM;
     conn->can_trim = 1;
   }
 
@@ -208,19 +207,17 @@
   if (fl == -1)
     return -1;
   if (fl) {
-    eflags |= NBD_FLAG_SEND_MARKNOREMANENCE;
+    flags |= NBD_FLAG_SEND_MARKNOREMANENCE;
     conn->can_marknoremanence = 1;
   }
 
-  debug ("oldstyle negotiation: flags: global 0x%x export 0x%x",
-         gflags, eflags);
+  debug ("oldstyle negotiation: server flags: 0x%x", flags);
 
   memset (&handshake, 0, sizeof handshake);
   memcpy (handshake.nbdmagic, "NBDMAGIC", 8);
   handshake.version = htobe64 (OLD_VERSION);
   handshake.exportsize = htobe64 (exportsize);
-  handshake.gflags = htobe16 (gflags);
-  handshake.eflags = htobe16 (eflags);
+  handshake.flags = htobe32 (flags);
 
   if (xwrite (conn->sockout, &handshake, sizeof handshake) == -1) {
     nbdkit_error ("write: %m");
diff -r d7d5078d08c7 -r dbd1ea0a401c src/protocol.h
--- a/src/protocol.h	Sun Sep 25 05:04:02 2016 +0200
+++ b/src/protocol.h	Mon Sep 26 17:28:54 2016 +0200
@@ -41,8 +41,7 @@
   char nbdmagic[8];           /* "NBDMAGIC" */
   uint64_t version;           /* OLD_VERSION, in network byte order */
   uint64_t exportsize;        /* in network byte order */
-  uint16_t gflags;            /* global flags, in network byte order */
-  uint16_t eflags;            /* per-export flags, in network byte order */
+  uint32_t flags;             /* flags, in network byte order */
   char zeroes[124];           /* must be sent as zero bytes */
 } __attribute__((packed));

Richard W.M. Jones

2016-Oct-03 13:05 UTC

head link

Re: [Libguestfs] [PATCH] nbdkit: flags are 32 bits for oldstyle connections

On Mon, Sep 26, 2016 at 06:00:15PM +0200, Carl-Daniel Hailfinger
wrote:> # HG changeset patch
> # User Carl-Daniel Hailfinger <Carl-Daniel.Hailfinger@inf.h-brs.de>
> # Date 1474903734 -7200
> #      Mon Sep 26 17:28:54 2016 +0200
> # Node ID dbd1ea0a401cedcfa426097a289d852971b14f1e
> # Parent  d7d5078d08c711032837dcac79a4450226ec2ce5
> nbdkit: Fix flags in old-style connection
Is there some other patch that this depends on?  It doesn't apply
to the current head.

Rich.
> diff -r d7d5078d08c7 -r dbd1ea0a401c src/connections.c
> --- a/src/connections.c	Sun Sep 25 05:04:02 2016 +0200
> +++ b/src/connections.c	Mon Sep 26 17:28:54 2016 +0200
> @@ -155,7 +155,7 @@
>    struct old_handshake handshake;
>    int64_t r;
>    uint64_t exportsize;
> -  uint16_t gflags, eflags;
> +  uint32_t flags;
>    int fl;
>  
>    r = plugin_get_size (conn);
> @@ -169,14 +169,13 @@
>    exportsize = (uint64_t) r;
>    conn->exportsize = exportsize;
>  
> -  gflags = 0;
> -  eflags = NBD_FLAG_HAS_FLAGS;
> +  flags = NBD_FLAG_HAS_FLAGS;
>  
>    fl = plugin_can_write (conn);
>    if (fl == -1)
>      return -1;
>    if (readonly || !fl) {
> -    eflags |= NBD_FLAG_READ_ONLY;
> +    flags |= NBD_FLAG_READ_ONLY;
>      conn->readonly = 1;
>    }
>  
> @@ -184,7 +183,7 @@
>    if (fl == -1)
>      return -1;
>    if (fl) {
> -    eflags |= NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA;
> +    flags |= NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA;
>      conn->can_flush = 1;
>    }
>  
> @@ -192,7 +191,7 @@
>    if (fl == -1)
>      return -1;
>    if (fl) {
> -    eflags |= NBD_FLAG_ROTATIONAL;
> +    flags |= NBD_FLAG_ROTATIONAL;
>      conn->is_rotational = 1;
>    }
>  
> @@ -200,7 +199,7 @@
>    if (fl == -1)
>      return -1;
>    if (fl) {
> -    eflags |= NBD_FLAG_SEND_TRIM;
> +    flags |= NBD_FLAG_SEND_TRIM;
>      conn->can_trim = 1;
>    }
>  
> @@ -208,19 +207,17 @@
>    if (fl == -1)
>      return -1;
>    if (fl) {
> -    eflags |= NBD_FLAG_SEND_MARKNOREMANENCE;
> +    flags |= NBD_FLAG_SEND_MARKNOREMANENCE;
>      conn->can_marknoremanence = 1;
>    }
>  
> -  debug ("oldstyle negotiation: flags: global 0x%x export 0x%x",
> -         gflags, eflags);
> +  debug ("oldstyle negotiation: server flags: 0x%x", flags);
>  
>    memset (&handshake, 0, sizeof handshake);
>    memcpy (handshake.nbdmagic, "NBDMAGIC", 8);
>    handshake.version = htobe64 (OLD_VERSION);
>    handshake.exportsize = htobe64 (exportsize);
> -  handshake.gflags = htobe16 (gflags);
> -  handshake.eflags = htobe16 (eflags);
> +  handshake.flags = htobe32 (flags);
>  
>    if (xwrite (conn->sockout, &handshake, sizeof handshake) == -1) {
>      nbdkit_error ("write: %m");
> diff -r d7d5078d08c7 -r dbd1ea0a401c src/protocol.h
> --- a/src/protocol.h	Sun Sep 25 05:04:02 2016 +0200
> +++ b/src/protocol.h	Mon Sep 26 17:28:54 2016 +0200
> @@ -41,8 +41,7 @@
>    char nbdmagic[8];           /* "NBDMAGIC" */
>    uint64_t version;           /* OLD_VERSION, in network byte order */
>    uint64_t exportsize;        /* in network byte order */
> -  uint16_t gflags;            /* global flags, in network byte order */
> -  uint16_t eflags;            /* per-export flags, in network byte order
*/
> +  uint32_t flags;             /* flags, in network byte order */
>    char zeroes[124];           /* must be sent as zero bytes */
>  } __attribute__((packed));
>  
> 
> _______________________________________________
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> Libguestfs@redhat.com
> https://www.redhat.com/mailman/listinfo/libguestfs
-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
virt-builder quickly builds VMs from scratch
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