[Qemu-devel] [PATCH v6 7/7] exec: add parameter errp to gethugepagesize

[Hu Tao]

Add parameter errp to gethugepagesize thus callers can handle errors.

This patch fixes a problem that if user adds a memory-backend-file
object using object_add command, specifying a non-existing directory
for property mem-path, qemu will core dump with message:

  /nonexistingdir: No such file or directory
  Bad ram offset fffffffffffff000
  Aborted (core dumped)

with this patch, qemu reports error message like:

  qemu-system-x86_64: -object 
memory-backend-file,mem-path=/nonexistingdir,id=mem-file0,size=128M:
  failed to stat file /nonexistingdir: No such file or directory

Signed-off-by: Hu Tao <address@hidden>
---
 exec.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/exec.c b/exec.c
index 50cd510..fdef0f7 100644
--- a/exec.c
+++ b/exec.c
@@ -996,7 +996,7 @@ void qemu_mutex_unlock_ramlist(void)
 
 #define HUGETLBFS_MAGIC       0x958458f6
 
-static long gethugepagesize(const char *path)
+static long gethugepagesize(const char *path, Error **errp)
 {
     struct statfs fs;
     int ret;
@@ -1006,7 +1006,8 @@ static long gethugepagesize(const char *path)
     } while (ret != 0 && errno == EINTR);
 
     if (ret != 0) {
-        perror(path);
+        error_setg_errno(errp, errno, "failed to get page size of file %s",
+                         path);
         return 0;
     }
 
@@ -1027,9 +1028,11 @@ static void *file_ram_alloc(RAMBlock *block,
     void *area = NULL;
     int fd;
     uint64_t hpagesize;
+    Error *local_err = NULL;
 
-    hpagesize = gethugepagesize(path);
-    if (!hpagesize) {
+    hpagesize = gethugepagesize(path, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
         goto error;
     }
 
-- 
1.9.3