Btrfs: fix how we deal with the pages array in the write path

[deliverable/linux.git] / fs / compat.c

diff --git a/fs/compat.c b/fs/compat.c
index f6fd0a00e6cc4737c23cd7b80c107401c422b993..691c3fd8ce1df11521ad678e611d5ffc23ad441c 100644 (file)
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1228,7 +1228,9 @@ compat_sys_preadv(unsigned long fd, const struct compat_iovec __user *vec,
        file = fget_light(fd, &fput_needed);
        if (!file)
                return -EBADF;
-       ret = compat_readv(file, vec, vlen, &pos);
+       ret = -ESPIPE;
+       if (file->f_mode & FMODE_PREAD)
+               ret = compat_readv(file, vec, vlen, &pos);
        fput_light(file, fput_needed);
        return ret;
 }
@@ -1285,7 +1287,9 @@ compat_sys_pwritev(unsigned long fd, const struct compat_iovec __user *vec,
        file = fget_light(fd, &fput_needed);
        if (!file)
                return -EBADF;
-       ret = compat_writev(file, vec, vlen, &pos);
+       ret = -ESPIPE;
+       if (file->f_mode & FMODE_PWRITE)
+               ret = compat_writev(file, vec, vlen, &pos);
        fput_light(file, fput_needed);
        return ret;
 }