fs/squashfs/decompressor_single.c

Source file repositories/reference/linux-study-clean/fs/squashfs/decompressor_single.c

File Facts

System
Linux kernel
Corpus path
fs/squashfs/decompressor_single.c
Extension
.c
Size
1956 bytes
Lines
92
Domain
Core OS
Bucket
VFS And Filesystem Core
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

struct squashfs_stream {
	void		*stream;
	struct mutex	mutex;
};

static void *squashfs_decompressor_create(struct squashfs_sb_info *msblk,
						void *comp_opts)
{
	struct squashfs_stream *stream;
	int err = -ENOMEM;

	stream = kmalloc_obj(*stream);
	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);
}

static void squashfs_decompressor_destroy(struct squashfs_sb_info *msblk)
{
	struct squashfs_stream *stream = msblk->stream;

	if (stream) {
		msblk->decompressor->free(stream->stream);
		kfree(stream);
	}
}

static int squashfs_decompress(struct squashfs_sb_info *msblk, struct bio *bio,
			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, bio,
		offset, length, output);
	mutex_unlock(&stream->mutex);

	if (res < 0)
		ERROR("%s decompression failed, data probably corrupt\n",
			msblk->decompressor->name);

	return res;
}

static int squashfs_max_decompressors(void)
{
	return 1;
}

const struct squashfs_decompressor_thread_ops squashfs_decompressor_single = {
	.create = squashfs_decompressor_create,
	.destroy = squashfs_decompressor_destroy,
	.decompress = squashfs_decompress,
	.max_decompressors = squashfs_max_decompressors,
};

Annotation

Implementation Notes