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Release 4.17 fs/squashfs/xz_wrapper.c

Directory: fs/squashfs
/*
 * Squashfs - a compressed read only filesystem for Linux
 *
 * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
 * Phillip Lougher <phillip@squashfs.org.uk>
 *
 * 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.
 *
 * xz_wrapper.c
 */


#include <linux/mutex.h>
#include <linux/buffer_head.h>
#include <linux/slab.h>
#include <linux/xz.h>
#include <linux/bitops.h>

#include "squashfs_fs.h"
#include "squashfs_fs_sb.h"
#include "squashfs.h"
#include "decompressor.h"
#include "page_actor.h"


struct squashfs_xz {
	
struct xz_dec *state;
	
struct xz_buf buf;
};


struct disk_comp_opts {
	
__le32 dictionary_size;
	
__le32 flags;
};


struct comp_opts {
	
int dict_size;
};


static void *squashfs_xz_comp_opts(struct squashfs_sb_info *msblk, void *buff, int len) { struct disk_comp_opts *comp_opts = buff; struct comp_opts *opts; int err = 0, n; opts = kmalloc(sizeof(*opts), GFP_KERNEL); if (opts == NULL) { err = -ENOMEM; goto out2; } if (comp_opts) { /* check compressor options are the expected length */ if (len < sizeof(*comp_opts)) { err = -EIO; goto out; } opts->dict_size = le32_to_cpu(comp_opts->dictionary_size); /* the dictionary size should be 2^n or 2^n+2^(n+1) */ n = ffs(opts->dict_size) - 1; if (opts->dict_size != (1 << n) && opts->dict_size != (1 << n) + (1 << (n + 1))) { err = -EIO; goto out; } } else /* use defaults */ opts->dict_size = max_t(int, msblk->block_size, SQUASHFS_METADATA_SIZE); return opts; out: kfree(opts); out2: return ERR_PTR(err); }

Contributors

PersonTokensPropCommitsCommitProp
Phillip Lougher194100.00%4100.00%
Total194100.00%4100.00%


static void *squashfs_xz_init(struct squashfs_sb_info *msblk, void *buff) { struct comp_opts *comp_opts = buff; struct squashfs_xz *stream; int err; stream = kmalloc(sizeof(*stream), GFP_KERNEL); if (stream == NULL) { err = -ENOMEM; goto failed; } stream->state = xz_dec_init(XZ_PREALLOC, comp_opts->dict_size); if (stream->state == NULL) { kfree(stream); err = -ENOMEM; goto failed; } return stream; failed: ERROR("Failed to initialise xz decompressor\n"); return ERR_PTR(err); }

Contributors

PersonTokensPropCommitsCommitProp
Phillip Lougher112100.00%4100.00%
Total112100.00%4100.00%


static void squashfs_xz_free(void *strm) { struct squashfs_xz *stream = strm; if (stream) { xz_dec_end(stream->state); kfree(stream); } }

Contributors

PersonTokensPropCommitsCommitProp
Phillip Lougher35100.00%1100.00%
Total35100.00%1100.00%


static int squashfs_xz_uncompress(struct squashfs_sb_info *msblk, void *strm, struct buffer_head **bh, int b, int offset, int length, struct squashfs_page_actor *output) { enum xz_ret xz_err; int avail, total = 0, k = 0; struct squashfs_xz *stream = strm; xz_dec_reset(stream->state); stream->buf.in_pos = 0; stream->buf.in_size = 0; stream->buf.out_pos = 0; stream->buf.out_size = PAGE_SIZE; stream->buf.out = squashfs_first_page(output); do { if (stream->buf.in_pos == stream->buf.in_size && k < b) { avail = min(length, msblk->devblksize - offset); length -= avail; stream->buf.in = bh[k]->b_data + offset; stream->buf.in_size = avail; stream->buf.in_pos = 0; offset = 0; } if (stream->buf.out_pos == stream->buf.out_size) { stream->buf.out = squashfs_next_page(output); if (stream->buf.out != NULL) { stream->buf.out_pos = 0; total += PAGE_SIZE; } } xz_err = xz_dec_run(stream->state, &stream->buf); if (stream->buf.in_pos == stream->buf.in_size && k < b) put_bh(bh[k++]); } while (xz_err == XZ_OK); squashfs_finish_page(output); if (xz_err != XZ_STREAM_END || k < b) goto out; return total + stream->buf.out_pos; out: for (; k < b; k++) put_bh(bh[k]); return -EIO; }

Contributors

PersonTokensPropCommitsCommitProp
Phillip Lougher33099.40%375.00%
Kirill A. Shutemov20.60%125.00%
Total332100.00%4100.00%

const struct squashfs_decompressor squashfs_xz_comp_ops = { .init = squashfs_xz_init, .comp_opts = squashfs_xz_comp_opts, .free = squashfs_xz_free, .decompress = squashfs_xz_uncompress, .id = XZ_COMPRESSION, .name = "xz", .supported = 1 };

Overall Contributors

PersonTokensPropCommitsCommitProp
Phillip Lougher77799.74%685.71%
Kirill A. Shutemov20.26%114.29%
Total779100.00%7100.00%
Directory: fs/squashfs
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