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Re: [Qemu-trivial] [Qemu-devel] [PATCH] dump: Show custom message for EN

From: Daniel Henrique Barboza
Subject: Re: [Qemu-trivial] [Qemu-devel] [PATCH] dump: Show custom message for ENOSPC
Date: Fri, 9 Feb 2018 18:07:21 -0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.2

Hi Yasmin,

On 02/09/2018 05:31 PM, Yasmin Beatriz wrote:
This patch intends to make a more specific message for when
the system has not enough space to save guest memory.

Reported-by: address@hidden
Cc: Jose Ricardo Ziviani <address@hidden>
Signed-off-by: Yasmin Beatriz <address@hidden>
  dump.c | 9 ++++++++-
  1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/dump.c b/dump.c
index e9dfed060a..eb56ff53f6 100644
--- a/dump.c
+++ b/dump.c
@@ -106,6 +106,9 @@ static int fd_write_vmcore(const void *buf, size_t size, 
void *opaque)

      written_size = qemu_write_full(s->fd, buf, size);
      if (written_size != size) {
+        if (errno == ENOSPC) {
+            return -ENOSPC;
+        }
You can do like this:

     if (written_size != size) {
+        return -errno;
+     }

Everyone is checking for a negative "ret" to see if an error occurred in qemu_write_full. There is no negative errno AFAIK, so you can spare one "if" clause there and still
check for -ENOSPC down there.

It might be worth checking if this code can't be baked into qemu_write_full too.



          return -1;

@@ -364,7 +367,11 @@ static void write_data(DumpState *s, void *buf, int 
length, Error **errp)

      ret = fd_write_vmcore(buf, length, s);
      if (ret < 0) {
-        error_setg(errp, "dump: failed to save memory");
+        if (ret == -ENOSPC) {
+            error_setg(errp, "dump: not enough space to save memory");
+        } else {
+            error_setg(errp, "dump: failed to save memory");
+        }
      } else {
          s->written_size += length;

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