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From: Eric Blake <eblake@redhat.com>
To: qemu-devel@nongnu.org
Cc: qemu-block@nongnu.org, vsementsov@virtuozzo.com,
	qemu-stable@nongnu.org, Paolo Bonzini <pbonzini@redhat.com>
Subject: [Qemu-devel] [PATCH for-2.11] nbd/client: Use error_prepend() correctly
Date: Mon, 13 Nov 2017 09:24:24 -0600	[thread overview]
Message-ID: <20171113152424.25381-1-eblake@redhat.com> (raw)

When using error prepend(), it is necessary to end with a space
in the format string; otherwise, messages come out incorrectly,
such as when connecting to a socket that hangs up immediately:

can't open device nbd://localhost:10809/: Failed to read dataUnexpected end-of-file before all bytes were read

Originally botched in commit e44ed99d, then several more instances
added in the meantime.

CC: qemu-stable@nongnu.org
Signed-off-by: Eric Blake <eblake@redhat.com>
---
 nbd/client.c | 50 ++++++++++++++++++++++++++------------------------
 1 file changed, 26 insertions(+), 24 deletions(-)

diff --git a/nbd/client.c b/nbd/client.c
index 1880103d2a..4e15fc484d 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -79,12 +79,12 @@ static int nbd_send_option_request(QIOChannel *ioc, uint32_t opt,
     stl_be_p(&req.length, len);

     if (nbd_write(ioc, &req, sizeof(req), errp) < 0) {
-        error_prepend(errp, "Failed to send option request header");
+        error_prepend(errp, "Failed to send option request header: ");
         return -1;
     }

     if (len && nbd_write(ioc, (char *) data, len, errp) < 0) {
-        error_prepend(errp, "Failed to send option request data");
+        error_prepend(errp, "Failed to send option request data: ");
         return -1;
     }

@@ -113,7 +113,7 @@ static int nbd_receive_option_reply(QIOChannel *ioc, uint32_t opt,
 {
     QEMU_BUILD_BUG_ON(sizeof(*reply) != 20);
     if (nbd_read(ioc, reply, sizeof(*reply), errp) < 0) {
-        error_prepend(errp, "failed to read option reply");
+        error_prepend(errp, "failed to read option reply: ");
         nbd_send_opt_abort(ioc);
         return -1;
     }
@@ -166,7 +166,7 @@ static int nbd_handle_reply_err(QIOChannel *ioc, nbd_opt_reply *reply,
         msg = g_malloc(reply->length + 1);
         if (nbd_read(ioc, msg, reply->length, errp) < 0) {
             error_prepend(errp, "failed to read option error 0x%" PRIx32
-                          " (%s) message",
+                          " (%s) message: ",
                           reply->type, nbd_rep_lookup(reply->type));
             goto cleanup;
         }
@@ -277,7 +277,7 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
         return -1;
     }
     if (nbd_read(ioc, &namelen, sizeof(namelen), errp) < 0) {
-        error_prepend(errp, "failed to read option name length");
+        error_prepend(errp, "failed to read option name length: ");
         nbd_send_opt_abort(ioc);
         return -1;
     }
@@ -290,7 +290,8 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
     }
     if (namelen != strlen(want)) {
         if (nbd_drop(ioc, len, errp) < 0) {
-            error_prepend(errp, "failed to skip export name with wrong length");
+            error_prepend(errp,
+                          "failed to skip export name with wrong length: ");
             nbd_send_opt_abort(ioc);
             return -1;
         }
@@ -299,14 +300,14 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,

     assert(namelen < sizeof(name));
     if (nbd_read(ioc, name, namelen, errp) < 0) {
-        error_prepend(errp, "failed to read export name");
+        error_prepend(errp, "failed to read export name: ");
         nbd_send_opt_abort(ioc);
         return -1;
     }
     name[namelen] = '\0';
     len -= namelen;
     if (nbd_drop(ioc, len, errp) < 0) {
-        error_prepend(errp, "failed to read export description");
+        error_prepend(errp, "failed to read export description: ");
         nbd_send_opt_abort(ioc);
         return -1;
     }
@@ -390,7 +391,7 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname,
             return -1;
         }
         if (nbd_read(ioc, &type, sizeof(type), errp) < 0) {
-            error_prepend(errp, "failed to read info type");
+            error_prepend(errp, "failed to read info type: ");
             nbd_send_opt_abort(ioc);
             return -1;
         }
@@ -405,13 +406,13 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname,
                 return -1;
             }
             if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) {
-                error_prepend(errp, "failed to read info size");
+                error_prepend(errp, "failed to read info size: ");
                 nbd_send_opt_abort(ioc);
                 return -1;
             }
             be64_to_cpus(&info->size);
             if (nbd_read(ioc, &info->flags, sizeof(info->flags), errp) < 0) {
-                error_prepend(errp, "failed to read info flags");
+                error_prepend(errp, "failed to read info flags: ");
                 nbd_send_opt_abort(ioc);
                 return -1;
             }
@@ -428,7 +429,7 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname,
             }
             if (nbd_read(ioc, &info->min_block, sizeof(info->min_block),
                          errp) < 0) {
-                error_prepend(errp, "failed to read info minimum block size");
+                error_prepend(errp, "failed to read info minimum block size: ");
                 nbd_send_opt_abort(ioc);
                 return -1;
             }
@@ -441,7 +442,8 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname,
             }
             if (nbd_read(ioc, &info->opt_block, sizeof(info->opt_block),
                          errp) < 0) {
-                error_prepend(errp, "failed to read info preferred block size");
+                error_prepend(errp,
+                              "failed to read info preferred block size: ");
                 nbd_send_opt_abort(ioc);
                 return -1;
             }
@@ -455,7 +457,7 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname,
             }
             if (nbd_read(ioc, &info->max_block, sizeof(info->max_block),
                          errp) < 0) {
-                error_prepend(errp, "failed to read info maximum block size");
+                error_prepend(errp, "failed to read info maximum block size: ");
                 nbd_send_opt_abort(ioc);
                 return -1;
             }
@@ -467,7 +469,7 @@ static int nbd_opt_go(QIOChannel *ioc, const char *wantname,
         default:
             trace_nbd_opt_go_info_unknown(type, nbd_info_lookup(type));
             if (nbd_drop(ioc, len, errp) < 0) {
-                error_prepend(errp, "Failed to read info payload");
+                error_prepend(errp, "Failed to read info payload: ");
                 nbd_send_opt_abort(ioc);
                 return -1;
             }
@@ -618,7 +620,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
     }

     if (nbd_read(ioc, buf, 8, errp) < 0) {
-        error_prepend(errp, "Failed to read data");
+        error_prepend(errp, "Failed to read data: ");
         goto fail;
     }

@@ -637,7 +639,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
     }

     if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
-        error_prepend(errp, "Failed to read magic");
+        error_prepend(errp, "Failed to read magic: ");
         goto fail;
     }
     magic = be64_to_cpu(magic);
@@ -649,7 +651,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
         bool fixedNewStyle = false;

         if (nbd_read(ioc, &globalflags, sizeof(globalflags), errp) < 0) {
-            error_prepend(errp, "Failed to read server flags");
+            error_prepend(errp, "Failed to read server flags: ");
             goto fail;
         }
         globalflags = be16_to_cpu(globalflags);
@@ -665,7 +667,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
         /* client requested flags */
         clientflags = cpu_to_be32(clientflags);
         if (nbd_write(ioc, &clientflags, sizeof(clientflags), errp) < 0) {
-            error_prepend(errp, "Failed to send clientflags field");
+            error_prepend(errp, "Failed to send clientflags field: ");
             goto fail;
         }
         if (tlscreds) {
@@ -727,13 +729,13 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,

         /* Read the response */
         if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) {
-            error_prepend(errp, "Failed to read export length");
+            error_prepend(errp, "Failed to read export length: ");
             goto fail;
         }
         be64_to_cpus(&info->size);

         if (nbd_read(ioc, &info->flags, sizeof(info->flags), errp) < 0) {
-            error_prepend(errp, "Failed to read export flags");
+            error_prepend(errp, "Failed to read export flags: ");
             goto fail;
         }
         be16_to_cpus(&info->flags);
@@ -750,13 +752,13 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,
         }

         if (nbd_read(ioc, &info->size, sizeof(info->size), errp) < 0) {
-            error_prepend(errp, "Failed to read export length");
+            error_prepend(errp, "Failed to read export length: ");
             goto fail;
         }
         be64_to_cpus(&info->size);

         if (nbd_read(ioc, &oldflags, sizeof(oldflags), errp) < 0) {
-            error_prepend(errp, "Failed to read export flags");
+            error_prepend(errp, "Failed to read export flags: ");
             goto fail;
         }
         be32_to_cpus(&oldflags);
@@ -772,7 +774,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name,

     trace_nbd_receive_negotiate_size_flags(info->size, info->flags);
     if (zeroes && nbd_drop(ioc, 124, errp) < 0) {
-        error_prepend(errp, "Failed to read reserved block");
+        error_prepend(errp, "Failed to read reserved block: ");
         goto fail;
     }
     rc = 0;
-- 
2.13.6

             reply	other threads:[~2017-11-13 15:24 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-13 15:24 Eric Blake [this message]
2017-11-13 15:32 ` [Qemu-devel] [PATCH for-2.11] nbd/client: Use error_prepend() correctly Eric Blake
2017-11-13 16:23   ` Vladimir Sementsov-Ogievskiy
2017-11-13 17:10   ` Markus Armbruster
2017-11-13 16:27 ` Vladimir Sementsov-Ogievskiy
2017-11-13 17:14 ` Markus Armbruster
2017-11-13 18:19   ` Eric Blake
2017-11-14  7:28     ` Markus Armbruster
2017-11-13 18:21 ` Eric Blake

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