!123 support querying mount infomations by cat /proc/mounts

Merge pull request !123 from JING/master

fs/include/fs/mount.h

@@ -35,6 +35,7 @@
 #include "fs/vfs_util.h"
 #include "fs/vnode.h"
 #include <sys/stat.h>
+#include <limits.h>
 
 struct MountOps;
 
@@ -50,6 +51,7 @@ struct Mount {
     void *data;                        /* private data */
     uint32_t hashseed;                 /* Random seed for vfshash */
     unsigned long mountFlags;          /* Flags for mount */
+    char pathName[PATH_MAX];           /* path name of mount point */
 };
 
 struct MountOps {

fs/proc/os_adapt/proc_vfs.c

@@ -257,9 +257,23 @@ int VfsProcfsClose(struct file *filep)
     return result;
 }
 
+int VfsProcfsStatfs(struct Mount *mnt, struct statfs *buf)
+{
+    (void)memset_s(buf, sizeof(struct statfs), 0, sizeof(struct statfs));
+    buf->f_type = PROCFS_MAGIC;
+
+    return LOS_OK;
+}
+
+int VfsProcfsClosedir(struct Vnode *vp, struct fs_dirent_s *dir)
+{
+    return LOS_OK;
+}
+
 const struct MountOps procfs_operations = {
     .Mount = VfsProcfsMount,
     .Unmount = NULL,
+    .Statfs = VfsProcfsStatfs,
 };
 
 static struct VnodeOps g_procfsVops = {
@@ -267,6 +281,7 @@ static struct VnodeOps g_procfsVops = {
     .Getattr = VfsProcfsStat,
     .Readdir = VfsProcfsReaddir,
     .Opendir = VfsProcfsOpendir,
+    .Closedir = VfsProcfsClosedir
 };
 
 static struct file_operations_vfs g_procfsFops = {