1 files changed, 71 insertions, 24 deletions

diff --git a/fs/statfs.c b/fs/statfs.c
index 4ef021f3b612..30ea8c8a996b 100644
--- a/fs/statfs.c
+++ b/fs/statfs.c
@@ -2,38 +2,83 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/file.h>
+#include <linux/mount.h>
 #include <linux/namei.h>
 #include <linux/statfs.h>
 #include <linux/security.h>
 #include <linux/uaccess.h>
 
-int vfs_statfs(struct dentry *dentry, struct kstatfs *buf)
+static int flags_by_mnt(int mnt_flags)
 {
-        int retval = -ENODEV;
-
-        if (dentry) {
-                retval = -ENOSYS;
-                if (dentry->d_sb->s_op->statfs) {
-                        memset(buf, 0, sizeof(*buf));
-                        retval = security_sb_statfs(dentry);
-                        if (retval)
-                                return retval;
-                        retval = dentry->d_sb->s_op->statfs(dentry, buf);
-                        if (retval == 0 && buf->f_frsize == 0)
-                                buf->f_frsize = buf->f_bsize;
-                }
-        }
+        int flags = 0;
+
+        if (mnt_flags & MNT_READONLY)
+                flags |= ST_RDONLY;
+        if (mnt_flags & MNT_NOSUID)
+                flags |= ST_NOSUID;
+        if (mnt_flags & MNT_NODEV)
+                flags |= ST_NODEV;
+        if (mnt_flags & MNT_NOEXEC)
+                flags |= ST_NOEXEC;
+        if (mnt_flags & MNT_NOATIME)
+                flags |= ST_NOATIME;
+        if (mnt_flags & MNT_NODIRATIME)
+                flags |= ST_NODIRATIME;
+        if (mnt_flags & MNT_RELATIME)
+                flags |= ST_RELATIME;
+        return flags;
+}
+
+static int flags_by_sb(int s_flags)
+{
+        int flags = 0;
+        if (s_flags & MS_SYNCHRONOUS)
+                flags |= ST_SYNCHRONOUS;
+        if (s_flags & MS_MANDLOCK)
+                flags |= ST_MANDLOCK;
+        return flags;
+}
+
+static int calculate_f_flags(struct vfsmount *mnt)
+{
+        return ST_VALID | flags_by_mnt(mnt->mnt_flags) |
+                flags_by_sb(mnt->mnt_sb->s_flags);
+}
+
+int statfs_by_dentry(struct dentry *dentry, struct kstatfs *buf)
+{
+        int retval;
+
+        if (!dentry->d_sb->s_op->statfs)
+                return -ENOSYS;
+
+        memset(buf, 0, sizeof(*buf));
+        retval = security_sb_statfs(dentry);
+        if (retval)
+                return retval;
+        retval = dentry->d_sb->s_op->statfs(dentry, buf);
+        if (retval == 0 && buf->f_frsize == 0)
+                buf->f_frsize = buf->f_bsize;
         return retval;
 }
 
+int vfs_statfs(struct path *path, struct kstatfs *buf)
+{
+        int error;
+
+        error = statfs_by_dentry(path->dentry, buf);
+        if (!error)
+                buf->f_flags = calculate_f_flags(path->mnt);
+        return error;
+}
 EXPORT_SYMBOL(vfs_statfs);
 
-static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
+static int do_statfs_native(struct path *path, struct statfs *buf)
 {
         struct kstatfs st;
         int retval;
 
-        retval = vfs_statfs(dentry, &st);
+        retval = vfs_statfs(path, &st);
         if (retval)
                 return retval;
 
@@ -67,17 +112,18 @@ static int vfs_statfs_native(struct dentry *dentry, struct statfs *buf)
                 buf->f_fsid = st.f_fsid;
                 buf->f_namelen = st.f_namelen;
                 buf->f_frsize = st.f_frsize;
+                buf->f_flags = st.f_flags;
                 memset(buf->f_spare, 0, sizeof(buf->f_spare));
         }
         return 0;
 }
 
-static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
+static int do_statfs64(struct path *path, struct statfs64 *buf)
 {
         struct kstatfs st;
         int retval;
 
-        retval = vfs_statfs(dentry, &st);
+        retval = vfs_statfs(path, &st);
         if (retval)
                 return retval;
 
@@ -94,6 +140,7 @@ static int vfs_statfs64(struct dentry *dentry, struct statfs64 *buf)
                 buf->f_fsid = st.f_fsid;
                 buf->f_namelen = st.f_namelen;
                 buf->f_frsize = st.f_frsize;
+                buf->f_flags = st.f_flags;
                 memset(buf->f_spare, 0, sizeof(buf->f_spare));
         }
         return 0;
@@ -107,7 +154,7 @@ SYSCALL_DEFINE2(statfs, const char __user *, pathname, struct statfs __user *, b
         error = user_path(pathname, &path);
         if (!error) {
                 struct statfs tmp;
-                error = vfs_statfs_native(path.dentry, &tmp);
+                error = do_statfs_native(&path, &tmp);
                 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                         error = -EFAULT;
                 path_put(&path);
@@ -125,7 +172,7 @@ SYSCALL_DEFINE3(statfs64, const char __user *, pathname, size_t, sz, struct stat
         error = user_path(pathname, &path);
         if (!error) {
                 struct statfs64 tmp;
-                error = vfs_statfs64(path.dentry, &tmp);
+                error = do_statfs64(&path, &tmp);
                 if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                         error = -EFAULT;
                 path_put(&path);
@@ -143,7 +190,7 @@ SYSCALL_DEFINE2(fstatfs, unsigned int, fd, struct statfs __user *, buf)
         file = fget(fd);
         if (!file)
                 goto out;
-        error = vfs_statfs_native(file->f_path.dentry, &tmp);
+        error = do_statfs_native(&file->f_path, &tmp);
         if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                 error = -EFAULT;
         fput(file);
@@ -164,7 +211,7 @@ SYSCALL_DEFINE3(fstatfs64, unsigned int, fd, size_t, sz, struct statfs64 __user
         file = fget(fd);
         if (!file)
                 goto out;
-        error = vfs_statfs64(file->f_path.dentry, &tmp);
+        error = do_statfs64(&file->f_path, &tmp);
         if (!error && copy_to_user(buf, &tmp, sizeof(tmp)))
                 error = -EFAULT;
         fput(file);
@@ -183,7 +230,7 @@ SYSCALL_DEFINE2(ustat, unsigned, dev, struct ustat __user *, ubuf)
         if (!s)
                 return -EINVAL;
 
-        err = vfs_statfs(s->s_root, &sbuf);
+        err = statfs_by_dentry(s->s_root, &sbuf);
         drop_super(s);
         if (err)
                 return err;