Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / squashfs / decompressor_single.c

diff --git a/kernel/fs/squashfs/decompressor_single.c b/kernel/fs/squashfs/decompressor_single.c
new file mode 100644 (file)
index 0000000..a6c7592
--- /dev/null
+++ b/kernel/fs/squashfs/decompressor_single.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2013
+ * Phillip Lougher <phillip@squashfs.org.uk>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ */
+
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+
+#include "squashfs_fs.h"
+#include "squashfs_fs_sb.h"
+#include "decompressor.h"
+#include "squashfs.h"
+
+/*
+ * This file implements single-threaded decompression in the
+ * decompressor framework
+ */
+
+struct squashfs_stream {
+       void            *stream;
+       struct mutex    mutex;
+};
+
+void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
+                                               void *comp_opts)
+{
+       struct squashfs_stream *stream;
+       int err = -ENOMEM;
+
+       stream = kmalloc(sizeof(*stream), GFP_KERNEL);
+       if (stream == NULL)
+               goto out;
+
+       stream->stream = msblk->decompressor->init(msblk, comp_opts);
+       if (IS_ERR(stream->stream)) {
+               err = PTR_ERR(stream->stream);
+               goto out;
+       }
+
+       kfree(comp_opts);
+       mutex_init(&stream->mutex);
+       return stream;
+
+out:
+       kfree(stream);
+       return ERR_PTR(err);
+}
+
+void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
+{
+       struct squashfs_stream *stream = msblk->stream;
+
+       if (stream) {
+               msblk->decompressor->free(stream->stream);
+               kfree(stream);
+       }
+}
+
+int squashfs_decompress(struct squashfs_sb_info *msblk, struct buffer_head **bh,
+       int b, int offset, int length, struct squashfs_page_actor *output)
+{
+       int res;
+       struct squashfs_stream *stream = msblk->stream;
+
+       mutex_lock(&stream->mutex);
+       res = msblk->decompressor->decompress(msblk, stream->stream, bh, b,
+               offset, length, output);
+       mutex_unlock(&stream->mutex);
+
+       if (res < 0)
+               ERROR("%s decompression failed, data probably corrupt\n",
+                       msblk->decompressor->name);
+
+       return res;
+}
+
+int squashfs_max_decompressors(void)
+{
+       return 1;
+}