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WSL2-Linux-Kernel/fs/squashfs/squashfs.h

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 35 Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 23 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190520170857.458548087@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-20 20:08:00 +03:00
/* SPDX-License-Identifier: GPL-2.0-or-later */
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/*
* Squashfs - a compressed read only filesystem for Linux
*
* Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
Squashfs: update email address My existing email address may stop working in a month or two, so update email to one that will continue working. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-26 13:39:56 +04:00
* Phillip Lougher <phillip@squashfs.org.uk>
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
*
* squashfs.h
*/
#define TRACE(s, args...) pr_debug("SQUASHFS: "s, ## args)
#define ERROR(s, args...) pr_err("SQUASHFS error: "s, ## args)
fs/squashfs/squashfs.h: replace pr_warning by pr_warn Update the last pr_warning callsite in fs branch Signed-off-by: Fabian Frederick <fabf@skynet.be> Cc: Phillip Lougher <phillip@squashfs.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-05 03:05:52 +04:00
#define WARNING(s, args...) pr_warn("SQUASHFS: "s, ## args)
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/* block.c */
Squashfs: Generalise paging handling in the decompressors Further generalise the decompressors by adding a page handler abstraction. This adds helpers to allow the decompressors to access and process the output buffers in an implementation independant manner. This allows different types of output buffer to be passed to the decompressors, with the implementation specific aspects handled at decompression time, but without the knowledge being held in the decompressor wrapper code. This will allow the decompressors to handle Squashfs cache buffers, and page cache pages. This patch adds the abstraction and an implementation for the caches. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
2013-11-18 06:59:12 +04:00
extern int squashfs_read_data(struct super_block *, u64, int, u64 *,
struct squashfs_page_actor *);
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/* cache.c */
extern struct squashfs_cache *squashfs_cache_init(char *, int, int);
extern void squashfs_cache_delete(struct squashfs_cache *);
extern struct squashfs_cache_entry *squashfs_cache_get(struct super_block *,
struct squashfs_cache *, u64, int);
extern void squashfs_cache_put(struct squashfs_cache_entry *);
extern int squashfs_copy_data(void *, struct squashfs_cache_entry *, int, int);
extern int squashfs_read_metadata(struct super_block *, void *, u64 *,
int *, int);
extern struct squashfs_cache_entry *squashfs_get_fragment(struct super_block *,
u64, int);
extern struct squashfs_cache_entry *squashfs_get_datablock(struct super_block *,
u64, int);
Squashfs: move table allocation into squashfs_read_table() This eliminates a lot of duplicate code. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-20 05:26:43 +04:00
extern void *squashfs_read_table(struct super_block *, u64, int);
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
Squashfs: add a decompressor framework This adds a decompressor framework which allows multiple compression algorithms to be cleanly supported. Also update zlib wrapper and other code to use the new framework. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-10-06 07:04:15 +04:00
/* decompressor.c */
extern const struct squashfs_decompressor *squashfs_lookup_decompressor(int);
Squashfs: Refactor decompressor interface and code The decompressor interface and code was written from the point of view of single-threaded operation. In doing so it mixed a lot of single-threaded implementation specific aspects into the decompressor code and elsewhere which makes it difficult to seamlessly support multiple different decompressor implementations. This patch does the following: 1. It removes compressor_options parsing from the decompressor init() function. This allows the decompressor init() function to be dynamically called to instantiate multiple decompressors, without the compressor options needing to be read and parsed each time. 2. It moves threading and all sleeping operations out of the decompressors. In doing so, it makes the decompressors non-blocking wrappers which only deal with interfacing with the decompressor implementation. 3. It splits decompressor.[ch] into decompressor generic functions in decompressor.[ch], and moves the single threaded decompressor implementation into decompressor_single.c. The result of this patch is Squashfs should now be able to support multiple decompressors by adding new decompressor_xxx.c files with specialised implementations of the functions in decompressor_single.c Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
2013-11-13 06:56:26 +04:00
extern void *squashfs_decompressor_setup(struct super_block *, unsigned short);
/* decompressor_xxx.c */
extern void *squashfs_decompressor_create(struct squashfs_sb_info *, void *);
extern void squashfs_decompressor_destroy(struct squashfs_sb_info *);
squashfs: migrate from ll_rw_block usage to BIO ll_rw_block() function has been deprecated in favor of BIO which appears to come with large performance improvements. This patch decreases boot time by close to 40% when using squashfs for the root file-system. This is observed at least in the context of starting an Android VM on Chrome OS using crosvm. The patch was tested on 4.19 as well as master. This patch is largely based on Adrien Schildknecht's patch that was originally sent as https://lkml.org/lkml/2017/9/22/814 though with some significant changes and simplifications while also taking Phillip Lougher's feedback into account, around preserving support for FILE_CACHE in particular. [akpm@linux-foundation.org: fix build error reported by Randy] Link: http://lkml.kernel.org/r/319997c2-5fc8-f889-2ea3-d913308a7c1f@infradead.org Signed-off-by: Philippe Liard <pliard@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Cc: Adrien Schildknecht <adrien+dev@schischi.me> Cc: Phillip Lougher <phillip@squashfs.org.uk> Cc: Guenter Roeck <groeck@chromium.org> Cc: Daniel Rosenberg <drosen@google.com> Link: https://chromium.googlesource.com/chromiumos/platform/crosvm Link: http://lkml.kernel.org/r/20191106074238.186023-1-pliard@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-02 07:45:23 +03:00
extern int squashfs_decompress(struct squashfs_sb_info *, struct bio *,
int, int, struct squashfs_page_actor *);
Squashfs: Refactor decompressor interface and code The decompressor interface and code was written from the point of view of single-threaded operation. In doing so it mixed a lot of single-threaded implementation specific aspects into the decompressor code and elsewhere which makes it difficult to seamlessly support multiple different decompressor implementations. This patch does the following: 1. It removes compressor_options parsing from the decompressor init() function. This allows the decompressor init() function to be dynamically called to instantiate multiple decompressors, without the compressor options needing to be read and parsed each time. 2. It moves threading and all sleeping operations out of the decompressors. In doing so, it makes the decompressors non-blocking wrappers which only deal with interfacing with the decompressor implementation. 3. It splits decompressor.[ch] into decompressor generic functions in decompressor.[ch], and moves the single threaded decompressor implementation into decompressor_single.c. The result of this patch is Squashfs should now be able to support multiple decompressors by adding new decompressor_xxx.c files with specialised implementations of the functions in decompressor_single.c Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
2013-11-13 06:56:26 +04:00
extern int squashfs_max_decompressors(void);
Squashfs: add a decompressor framework This adds a decompressor framework which allows multiple compression algorithms to be cleanly supported. Also update zlib wrapper and other code to use the new framework. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-10-06 07:04:15 +04:00
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/* export.c */
Squashfs: add sanity checks to lookup table reading at mount time Fsfuzzer generates corrupted filesystems which throw a warn_on in kmalloc. One of these is due to a corrupted superblock inodes field. Fix this by checking that the number of bytes to be read (and allocated) does not extend into the next filesystem structure. Also add a couple of other sanity checks of the mount-time lookup table structures. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-24 07:15:21 +04:00
extern __le64 *squashfs_read_inode_lookup_table(struct super_block *, u64, u64,
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
unsigned int);
/* fragment.c */
extern int squashfs_frag_lookup(struct super_block *, unsigned int, u64 *);
extern __le64 *squashfs_read_fragment_index_table(struct super_block *,
Squashfs: add sanity checks to fragment reading at mount time Fsfuzzer generates corrupted filesystems which throw a warn_on in kmalloc. One of these is due to a corrupted superblock fragments field. Fix this by checking that the number of bytes to be read (and allocated) does not extend into the next filesystem structure. Also add a couple of other sanity checks of the mount-time fragment table structures. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-24 07:33:34 +04:00
u64, u64, unsigned int);
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
Squashfs: Restructure squashfs_readpage() Restructure squashfs_readpage() splitting it into separate functions for datablocks, fragments and sparse blocks. Move the memcpying (from squashfs cache entry) implementation of squashfs_readpage_block into file_cache.c This allows different implementations to be supported. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
2013-10-31 23:24:27 +04:00
/* file.c */
squashfs metadata 2: electric boogaloo Anatoly continues to find issues with fuzzed squashfs images. This time, corrupt, missing, or undersized data for the page filling wasn't checked for, because the squashfs_{copy,read}_cache() functions did the squashfs_copy_data() call without checking the resulting data size. Which could result in the page cache pages being incompletely filled in, and no error indication to the user space reading garbage data. So make a helper function for the "fill in pages" case, because the exact same incomplete sequence existed in two places. [ I should have made a squashfs branch for these things, but I didn't intend to start doing them in the first place. My historical connection through cramfs is why I got into looking at these issues at all, and every time I (continue to) think it's a one-off. Because _this_ time is always the last time. Right? - Linus ] Reported-by: Anatoly Trosinenko <anatoly.trosinenko@gmail.com> Tested-by: Willy Tarreau <w@1wt.eu> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Phillip Lougher <phillip@squashfs.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-08-01 20:38:43 +03:00
void squashfs_fill_page(struct page *, struct squashfs_cache_entry *, int, int);
Squashfs: Restructure squashfs_readpage() Restructure squashfs_readpage() splitting it into separate functions for datablocks, fragments and sparse blocks. Move the memcpying (from squashfs cache entry) implementation of squashfs_readpage_block into file_cache.c This allows different implementations to be supported. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
2013-10-31 23:24:27 +04:00
void squashfs_copy_cache(struct page *, struct squashfs_cache_entry *, int,
int);
/* file_xxx.c */
Squashfs: Compute expected length from inode size rather than block length Previously in squashfs_readpage() when copying data into the page cache, it used the length of the datablock read from the filesystem (after decompression). However, if the filesystem has been corrupted this data block may be short, which will leave pages unfilled. The fix for this is to compute the expected number of bytes to copy from the inode size, and use this to detect if the block is short. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Tested-by: Willy Tarreau <w@1wt.eu> Cc: Анатолий Тросиненко <anatoly.trosinenko@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-08-02 18:45:15 +03:00
extern int squashfs_readpage_block(struct page *, u64, int, int);
Squashfs: Restructure squashfs_readpage() Restructure squashfs_readpage() splitting it into separate functions for datablocks, fragments and sparse blocks. Move the memcpying (from squashfs cache entry) implementation of squashfs_readpage_block into file_cache.c This allows different implementations to be supported. Signed-off-by: Phillip Lougher <phillip@squashfs.org.uk> Reviewed-by: Minchan Kim <minchan@kernel.org>
2013-10-31 23:24:27 +04:00
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/* id.c */
extern int squashfs_get_id(struct super_block *, unsigned int, unsigned int *);
Squashfs: add sanity checks to id reading at mount time Fsfuzzer generates corrupted filesystems which throw a warn_on in kmalloc. One of these is due to a corrupted superblock no_ids field. Fix this by checking that the number of bytes to be read (and allocated) does not extend into the next filesystem structure. Also add a couple of other sanity checks of the mount-time id table structures. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2011-05-24 07:05:22 +04:00
extern __le64 *squashfs_read_id_index_table(struct super_block *, u64, u64,
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
unsigned short);
/* inode.c */
extern struct inode *squashfs_iget(struct super_block *, long long,
unsigned int);
extern int squashfs_read_inode(struct inode *, long long);
squashfs: add new extended inode types Add new extended inode types that store the xattr_id field. Also add the necessary code changes to make xattrs visibile. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-17 07:06:56 +04:00
/* xattr.c */
extern ssize_t squashfs_listxattr(struct dentry *, char *, size_t);
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/*
squashfs: add new extended inode types Add new extended inode types that store the xattr_id field. Also add the necessary code changes to make xattrs visibile. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-17 07:06:56 +04:00
* Inodes, files, decompressor and xattr operations
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
*/
/* dir.c */
extern const struct file_operations squashfs_dir_ops;
/* export.c */
extern const struct export_operations squashfs_export_ops;
/* file.c */
extern const struct address_space_operations squashfs_aops;
squashfs: add new extended inode types Add new extended inode types that store the xattr_id field. Also add the necessary code changes to make xattrs visibile. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-17 07:06:56 +04:00
/* inode.c */
extern const struct inode_operations squashfs_inode_ops;
Squashfs: header files Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2009-01-05 11:46:27 +03:00
/* namei.c */
extern const struct inode_operations squashfs_dir_inode_ops;
/* symlink.c */
extern const struct address_space_operations squashfs_symlink_aops;
squashfs: add new extended inode types Add new extended inode types that store the xattr_id field. Also add the necessary code changes to make xattrs visibile. Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-17 07:06:56 +04:00
extern const struct inode_operations squashfs_symlink_inode_ops;
/* xattr.c */
squashfs: constify xattr handlers Signed-off-by: Phillip Lougher <phillip@lougher.demon.co.uk>
2010-05-23 06:29:26 +04:00
extern const struct xattr_handler *squashfs_xattr_handlers[];