On Tue, Oct 04, 2016 at 12:10:44PM +0200, Enrico Jorns wrote: > This ports lzo_wrapper from kernel code and adds some minimal adaptions > to make squashfs lzo compression work in barebox. > > Signed-off-by: Enrico Jorns <ejo@xxxxxxxxxxxxxx> > --- > fs/squashfs/Kconfig | 14 +++++ > fs/squashfs/Makefile | 1 + > fs/squashfs/lzo_wrapper.c | 128 ++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/lzo.h | 47 +++++++++++++++++ > 4 files changed, 190 insertions(+) > create mode 100644 fs/squashfs/lzo_wrapper.c > create mode 100644 include/linux/lzo.h > > diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig > index dc25d93..d8ee554 100644 > --- a/fs/squashfs/Kconfig > +++ b/fs/squashfs/Kconfig > @@ -17,6 +17,20 @@ menuconfig FS_SQUASHFS > embedded systems where low overhead is needed. Further information > and tools are available from http://squashfs.sourceforge.net. > > +config SQUASHFS_LZO > + bool "Include support for LZO compressed file systems" > + default y > + depends on FS_SQUASHFS > + select LZO_DECOMPRESS > + help > + Saying Y here includes support for reading Squashfs file systems > + compressed with LZO compression. LZO compression is mainly > + aimed at embedded systems with slower CPUs where the overheads > + of zlib are too high. > + > + LZO is not the standard compression used in Squashfs and so most > + file systems will be readable without selecting this option. > + > config SQUASHFS_XZ > bool "Include support for XZ compressed file systems" > default y > diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile > index c0d024c..447e15e 100644 > --- a/fs/squashfs/Makefile > +++ b/fs/squashfs/Makefile > @@ -11,3 +11,4 @@ obj-y += inode.o > obj-y += namei.o > obj-y += super.o > obj-$(CONFIG_SQUASHFS_XZ) += xz_wrapper.o > +obj-$(CONFIG_SQUASHFS_LZO) += lzo_wrapper.o > diff --git a/fs/squashfs/lzo_wrapper.c b/fs/squashfs/lzo_wrapper.c > new file mode 100644 > index 0000000..b457955 > --- /dev/null > +++ b/fs/squashfs/lzo_wrapper.c > @@ -0,0 +1,128 @@ > +/* > + * Squashfs - a compressed read only filesystem for Linux > + * > + * Copyright (c) 2010 LG Electronics > + * Chan Jeong <chan.jeong@xxxxxxx> > + * > + * This program is free software; you can redistribute it and/or > + * modify it under the terms of the GNU General Public License > + * as published by the Free Software Foundation; either version 2, > + * or (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + * You should have received a copy of the GNU General Public License > + * along with this program; if not, write to the Free Software > + * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. > + * > + * lzo_wrapper.c > + */ > + > +#include <linux/mutex.h> > +#include <linux/lzo.h> > +#include <types.h> > + > +#include "squashfs_fs.h" > +#include "squashfs_fs_sb.h" > +#include "squashfs.h" > +#include "decompressor.h" > +#include "page_actor.h" > + > +struct squashfs_lzo { > + void *input; > + void *output; > +}; > + > +static void *lzo_init(struct squashfs_sb_info *msblk, void *buff) > +{ > + int block_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); > + > + struct squashfs_lzo *stream = kzalloc(sizeof(*stream), GFP_KERNEL); > + if (stream == NULL) > + goto failed; > + stream->input = vmalloc(block_size); > + if (stream->input == NULL) > + goto failed; > + stream->output = vmalloc(block_size); > + if (stream->output == NULL) > + goto failed2; > + > + return stream; > + > +failed2: > + vfree(stream->input); > +failed: > + ERROR("Failed to allocate lzo workspace\n"); > + kfree(stream); > + return ERR_PTR(-ENOMEM); > +} > + > + > +static void lzo_free(void *strm) > +{ > + struct squashfs_lzo *stream = strm; > + > + if (stream) { > + vfree(stream->input); > + vfree(stream->output); > + } > + kfree(stream); > +} > + > + > +static int lzo_uncompress(struct squashfs_sb_info *msblk, void *strm, > + char **bh, int b, int offset, int length, > + struct squashfs_page_actor *output) > +{ > + struct squashfs_lzo *stream = strm; > + void *buff = stream->input, *data; > + int avail, i, bytes = length, res; > + size_t out_len = output->length; > + > + for (i = 0; i < b; i++) { > + avail = min(bytes, msblk->devblksize - offset); > + memcpy(buff, bh[i] + offset, avail); > + buff += avail; > + bytes -= avail; > + offset = 0; > + kfree(bh[i]); > + } > + > + res = lzo1x_decompress_safe(stream->input, (size_t)length, > + stream->output, &out_len); > + if (res != LZO_E_OK) > + goto failed; > + > + res = bytes = (int)out_len; > + data = squashfs_first_page(output); > + buff = stream->output; > + while (data) { > + if (bytes <= PAGE_CACHE_SIZE) { > + memcpy(data, buff, bytes); > + break; > + } else { > + memcpy(data, buff, PAGE_CACHE_SIZE); > + buff += PAGE_CACHE_SIZE; > + bytes -= PAGE_CACHE_SIZE; > + data = squashfs_next_page(output); > + } > + } > + squashfs_finish_page(output); > + > + return res; > + > +failed: > + return -EIO; > +} > + > +const struct squashfs_decompressor squashfs_lzo_comp_ops = { > + .init = lzo_init, > + .free = lzo_free, > + .decompress = lzo_uncompress, > + .id = LZO_COMPRESSION, > + .name = "lzo", > + .supported = 1 > +}; > diff --git a/include/linux/lzo.h b/include/linux/lzo.h We already have include/lzo.h with the same content, no need to add it again. Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
