nfsd4: fix share mode permissions

[safe/jmp/linux-2.6] / fs / libfs.c

diff --git a/fs/libfs.c b/fs/libfs.c
index ddfa899..219576c 100644 (file)
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -217,7 +217,7 @@ int get_sb_pseudo(struct file_system_type *fs_type, char *name,
                return PTR_ERR(s);
 
        s->s_flags = MS_NOUSER;
-       s->s_maxbytes = ~0ULL;
+       s->s_maxbytes = MAX_LFS_FILESIZE;
        s->s_blocksize = PAGE_SIZE;
        s->s_blocksize_bits = PAGE_SHIFT;
        s->s_magic = magic;
@@ -527,14 +527,18 @@ ssize_t simple_read_from_buffer(void __user *to, size_t count, loff_t *ppos,
                                const void *from, size_t available)
 {
        loff_t pos = *ppos;
+       size_t ret;
+
        if (pos < 0)
                return -EINVAL;
-       if (pos >= available)
+       if (pos >= available || !count)
                return 0;
        if (count > available - pos)
                count = available - pos;
-       if (copy_to_user(to, from + pos, count))
+       ret = copy_to_user(to, from + pos, count);
+       if (ret == count)
                return -EFAULT;
+       count -= ret;
        *ppos = pos + count;
        return count;
 }
@@ -735,10 +739,11 @@ ssize_t simple_attr_write(struct file *file, const char __user *buf,
        if (copy_from_user(attr->set_buf, buf, size))
                goto out;
 
-       ret = len; /* claim we got the whole input */
        attr->set_buf[size] = '\0';
        val = simple_strtol(attr->set_buf, NULL, 0);
-       attr->set(attr->data, val);
+       ret = attr->set(attr->data, val);
+       if (ret == 0)
+               ret = len; /* on success, claim we got the whole input */
 out:
        mutex_unlock(&attr->mutex);
        return ret;