+struct nfs_cache_array *nfs_readdir_get_array(struct page *page)
+{
+ if (page == NULL)
+ return ERR_PTR(-EIO);
+ return (struct nfs_cache_array *)kmap(page);
+}
+
+static
+void nfs_readdir_release_array(struct page *page)
+{
+ kunmap(page);
+}
+
+/*
+ * we are freeing strings created by nfs_add_to_readdir_array()
+ */
+static
+int nfs_readdir_clear_array(struct page *page, gfp_t mask)
+{
+ struct nfs_cache_array *array = nfs_readdir_get_array(page);
+ int i;
+ for (i = 0; i < array->size; i++)
+ kfree(array->array[i].string.name);
+ nfs_readdir_release_array(page);
+ return 0;
+}
+
+/*
+ * the caller is responsible for freeing qstr.name
+ * when called by nfs_readdir_add_to_array, the strings will be freed in
+ * nfs_clear_readdir_array()
+ */
+static
+int nfs_readdir_make_qstr(struct qstr *string, const char *name, unsigned int len)
+{
+ string->len = len;
+ string->name = kmemdup(name, len, GFP_KERNEL);
+ if (string->name == NULL)
+ return -ENOMEM;
+ string->hash = full_name_hash(name, len);
+ return 0;
+}
+
+static
+int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page)
+{
+ struct nfs_cache_array *array = nfs_readdir_get_array(page);
+ struct nfs_cache_array_entry *cache_entry;
+ int ret;
+
+ if (IS_ERR(array))
+ return PTR_ERR(array);
+ ret = -EIO;
+ if (array->size >= MAX_READDIR_ARRAY)
+ goto out;
+
+ cache_entry = &array->array[array->size];
+ cache_entry->cookie = entry->prev_cookie;
+ cache_entry->ino = entry->ino;
+ ret = nfs_readdir_make_qstr(&cache_entry->string, entry->name, entry->len);
+ if (ret)
+ goto out;
+ array->last_cookie = entry->cookie;
+ if (entry->eof == 1)
+ array->eof_index = array->size;
+ array->size++;
+out:
+ nfs_readdir_release_array(page);
+ return ret;
+}
+
+static
+int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
+{
+ loff_t diff = desc->file->f_pos - desc->current_index;
+ unsigned int index;
+
+ if (diff < 0)
+ goto out_eof;
+ if (diff >= array->size) {
+ if (array->eof_index > 0)
+ goto out_eof;
+ desc->current_index += array->size;
+ return -EAGAIN;
+ }
+
+ index = (unsigned int)diff;
+ *desc->dir_cookie = array->array[index].cookie;
+ desc->cache_entry_index = index;
+ if (index == array->eof_index)
+ desc->eof = 1;
+ return 0;
+out_eof:
+ desc->eof = 1;
+ return -EBADCOOKIE;
+}
+
+static
+int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc)
+{
+ int i;
+ int status = -EAGAIN;
+
+ for (i = 0; i < array->size; i++) {
+ if (i == array->eof_index) {
+ desc->eof = 1;
+ status = -EBADCOOKIE;
+ }
+ if (array->array[i].cookie == *desc->dir_cookie) {
+ desc->cache_entry_index = i;
+ status = 0;
+ break;
+ }
+ }
+
+ return status;
+}
+
+static
+int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc)
+{
+ struct nfs_cache_array *array;
+ int status = -EBADCOOKIE;
+
+ if (desc->dir_cookie == NULL)
+ goto out;
+
+ array = nfs_readdir_get_array(desc->page);
+ if (IS_ERR(array)) {
+ status = PTR_ERR(array);
+ goto out;
+ }
+
+ if (*desc->dir_cookie == 0)
+ status = nfs_readdir_search_for_pos(array, desc);
+ else
+ status = nfs_readdir_search_for_cookie(array, desc);
+
+ nfs_readdir_release_array(desc->page);
+out:
+ return status;
+}
+
+/* Fill a page with xdr information before transferring to the cache page */
+static
+int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc,
+ struct nfs_entry *entry, struct file *file, struct inode *inode)
git.openpandora.org / pandora-kernel.git / blobdiff