[libvirt] [PATCH v2] Define CPUINFO_FILE_LEN and fix maxlen of cpuinfo file for all uses

[Olivia Yin]

For example, the file /proc/cpuinfo for 24 cores PowerPC platform is larger than
the previous maximum size 2KB.
It will fail to start libvirtd with the error message as below:
virFileReadAll: Failed to read file '/proc/cpuinfo': Value too large for defined
data type
virSysinfoRead: internal error Failed to open /proc/cpuinfo

This patch defines CPUINFO_FILE_LEN as 10KB which is enough for most architectures.

Signed-off-by: Olivia Yin <Hong-Hua.Yin at freescale.com>
---
 src/util/virsysinfo.c | 6 +++---
 src/util/virsysinfo.h | 2 ++
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/util/virsysinfo.c b/src/util/virsysinfo.c
index 7b16157..873872c 100644
--- a/src/util/virsysinfo.c
+++ b/src/util/virsysinfo.c
@@ -223,7 +223,7 @@ virSysinfoRead(void)
     if (VIR_ALLOC(ret) < 0)
         goto no_memory;
 
-    if (virFileReadAll(CPUINFO, 2048, &outbuf) < 0) {
+    if (virFileReadAll(CPUINFO, CPUINFO_FILE_LEN, &outbuf) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Failed to open %s"), CPUINFO);
         return NULL;
@@ -341,7 +341,7 @@ virSysinfoRead(void)
     if (VIR_ALLOC(ret) < 0)
         goto no_memory;
 
-    if (virFileReadAll(CPUINFO, 2048, &outbuf) < 0) {
+    if (virFileReadAll(CPUINFO, CPUINFO_FILE_LEN, &outbuf) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Failed to open %s"), CPUINFO);
         return NULL;
@@ -470,7 +470,7 @@ virSysinfoRead(void)
         goto no_memory;
 
     /* Gather info from /proc/cpuinfo */
-    if (virFileReadAll(CPUINFO, 8192, &outbuf) < 0) {
+    if (virFileReadAll(CPUINFO, CPUINFO_FILE_LEN, &outbuf) < 0) {
         virReportError(VIR_ERR_INTERNAL_ERROR,
                        _("Failed to open %s"), CPUINFO);
         return NULL;
diff --git a/src/util/virsysinfo.h b/src/util/virsysinfo.h
index fbb505b..b5336e2 100644
--- a/src/util/virsysinfo.h
+++ b/src/util/virsysinfo.h
@@ -102,4 +102,6 @@ bool virSysinfoIsEqual(virSysinfoDefPtr src,
 
 VIR_ENUM_DECL(virSysinfo)
 
+#define CPUINFO_FILE_LEN (10*1024)	/*10KB limit for /proc/cpuinfo file*/
+
 #endif /* __VIR_SYSINFOS_H__ */
-- 
1.8.5