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2021-03-22block processor: simplify backlog accountingDavid Oberhollenzer
Simply count the number of blocks we hand out (malloc'ed or recycled) and decrease the counter when we put blocks back for recycling. The sync() part becomes a little more complicated, because we can get stuck with a backlog of 1 or 2 because we have a fragment or current block buffer in use. We also need to accout for this when creating the processor, because we need to be able to request at least 2 blocks without stalling. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-22Cleanup the block processor file structureDavid Oberhollenzer
A cleaner separation between common code, frontend code and backend code is made. The "is this byte blob zero" function is moved out to libutil (with test case and everything) with a more optimized implementation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-21Fix missing error code initializationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-21Cleanup: Rewrite block processor to use the libutil thread_pool_tDavid Oberhollenzer
Throw out the messy thread pool implementation and temporarily also remove the exact fragment matching for simplicity. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-07Optionally use a pool allocator for rb-tree nodesDavid Oberhollenzer
This commit restructures the rbtree code to optionally use a pool allocator for the nodes. The option is made depenend on the presence of a pre-processor flag. To the configure script is added an option to enable/disable the use of custom allocators. It makes sense to still allow the malloc/free based routes for better ASAN based instrumentation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-07Rewrite the str_table to internally use the more opimized hash_tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Fix: meta reader behaviour if accessing block at location 0David Oberhollenzer
Technically, this should *never* **ever** happen, because a SquashFS file always starts with a super block, which isn't wrapped in a meta data block, so a valid SquashFS file will never have a reason to read from offset 0. However, this does bite us when doing unit tests where the meta reader and writer are used on an otherwise empty file. When trying to read from offset 0, the caching code assumes that we already have that block, since tha block_offset got initialized to 0. This commit changes the initialization to set the current block location to the maximum 64 bit integer, a location we are never going to read from, since it will always be after the limit. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: replace ad-hoc dynamic array in sqfs_xattr_writer_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: repalce ad-hoc dynamic array used for export tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: replace ad-hoc dynamic array in sqfs_id_table_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Cleanup: replace ad-hoc dynamic array in sqfs_frag_table_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-03-06Store xattr writer block description in a red-black treeDavid Oberhollenzer
By storing the blocks in a tree, the de-duplication can lookup existing blocks in logartihmic instead of linear time. The linked list is still maintained, because we need to iterate over the blocks in creation order during serialization. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-02-28added shared read access when opening sqfs image with read-only flags (win32)Thomas Lang
2021-02-10Always use the correct data type for realloc return valueDavid Oberhollenzer
This commit mainly serves the static analysis tooling. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19libsqfs: Implement exact matching of fragmentsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19Add a user pointer to the hash table implementationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19libsqfs: Add a sqfs_block_processor_create_ex functionDavid Oberhollenzer
This function creates a block processor from a structure describing it. A stub implementation for the old sqfs_block_processor_create is added that simply sets up such a struct and forwards the call. The current version of the description struct only contains the exact same parameters and a size field at the beginning. This approach is supposed to make extending the range of parameters easier without breaking ABI compatibillity. Currently already planned are: - Adding a sqfs_file_t pointer to double-check when deduplicating fragments. - When the scanning code reaches a usable state, add the abillity to pass scanned fragment data, so the block processor can be used for appending to an existing image. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19libsqfs: block processor: removed unused chunk next pointerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-19Fix: Move fragment consolidation back to block processor serial partDavid Oberhollenzer
Keeping a list of fragments stored away in the current fragment block and consolidating them in the thread pool takes them out of circulation. If we have a lot of tiny fragments, this can lead to a situation where all the limit is reached, but we cannot do anything, because we are waiting for a block to complete, but they are all attached to the current fragment block and the queue is empty. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-01-15Fix more normalization of slashes in filenames.Scott Moser
It looks like the last commit missed a couple more occurences where '\' was treated incorrectly. Fixes were still needed in sqfs_dir_reader_find_by_path and sqfs_dir_reader_get_full_hierarchy. This path is used in extras/browse.c.
2020-12-06libsqfs: implement exact matching in the default block writer.David Oberhollenzer
Instead of comparing (compresed, disk-size, checksum) tuples to find block matches, do an exact, byte-for-byte comparison of the data stored on disk to avoid the possibility of a spurious colision. Since this is the desired behaviour, make it the default, optionally overrideable through a flag. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-11-07Fix: libsquashfs: xattr_writer: return NULL if calloc failsDavid Oberhollenzer
Instead of dereferencing the NULL pointer and crashing. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-08-12Fix block processor single block with don't fragment flag bugDavid Oberhollenzer
This commit fixes a bug where the block processor state machine would not add the "last block" flag if there is only one not entirely filled block and the "don't fragment" flag is set. If the flag isn't set, the inode start block position is not updated and points to the beginning of the image instead. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-08-04Cleanup: move zlib/lz4 code from lib/sqfs/comp/ to lib/David Oberhollenzer
The source code of a modified liblz4 and zlib are included with the option to compile them into libsquashfs if they are not available on the system. So far, the source code was included directly in the compressor sub directory within libsqsuashfs. This commit moves the libraries out into the lib directory. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-07-29Fix: xattr reader: read the header after seaking to an OOL valueDavid Oberhollenzer
If an xattr value is stored OOL, the value actually holds an 8 byte reference to another, previously stored value. This reference points to the header that we need to read to know the actual size of the value before reading it, not the value itself, so after reading the reference and seeking to it, the xattr reader needs to read the actual header. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-20Fix block bounds checking in libsquashfs data readerDavid Oberhollenzer
Instead of doing the fragile size comparison in both loops, simply bail from the function if offset is out of bounds, clamp the size to the available range of the file and abail if it is zero. As a result, a lot of checks can be removed and the function will not return data beyond EOF. This problem occoured with files that have a short last block instead of a fragment. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-13Fix: don't include alloca.h on systems that don't provide this headerv1.0.0David Oberhollenzer
This commit fixes a build issue on BSD based systems, where alloca is defined in stdlib.h and there is no such thing as "alloca.h". Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-13Bump the so version number for libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-12Add an explicit defition for the libsquashfs so versionDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-11Add flags to functions that might logically be expanded in the futureDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-09Cleanup: mark sqfs_xattr_writer_flush writer argument as constDavid Oberhollenzer
It does not make any changes to the writer itself, so mark it as const. This also requires some similar changes to the string table. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-09Cleanup: remove refcount adjusting in sqfs_xattr_writer_endDavid Oberhollenzer
After finding a match, reducing the reference count of the matched elements and increasing them afterwards leaves the reference count identical, because they refere to the same entries. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-09Cleanup: split libsquashfs xattr writer codeDavid Oberhollenzer
This commit moves the libsquashfs xattr related code into a sub directory and splits the xattr writer code up into several files. No actual code is changed. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-07Fix uninitialized error code in block processor error pathDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-07Move the fragment deduplication hash table back into the block processorDavid Oberhollenzer
Fragment deduplication really doesn't belong into the public API of the fragment table. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-07block processor: add an internal common cleanup functionDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-04Cleanup: Pull compression level parameter out into compressor configDavid Oberhollenzer
Every compressor (except LC4) has a compression level parameter. This commit pulls the compression level field out into the generic configuration structure and applies some code clean ups as a result from this. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-04Strictly enfore min/max dictionary size in XZ & LZMA compressorsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-04lzma compressor: support micro management optionsDavid Oberhollenzer
The LZMA compressor (through the xz-utils library) supports basically the same options for micro management as the XZ compressor. This commit enables support for those options in the compressor, the option parser and adds an option field to the configuration structure. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-04lzma compressor: add support for the "extreme" flagDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-06-03Cleanup: Add defines for minimum and maximum block sizeDavid Oberhollenzer
This commit adds propper defines in the super block header and removes some of the hard coded constants. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-30Block processor: cleanup macros, merge windows & pthread initializationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Block processor: merge finish & sync functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Block processor: allow operation without a fragment tableDavid Oberhollenzer
This commit modifies the block processor to support operating without a fragment table. If that is the case, fragment deduplication is essentially disabled and fragment blocks aren't indexed anymore. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Block processor: Add a raw block submission functionDavid Oberhollenzer
This function allows submission of raw blocks to the block processor, completely bypassing the file API. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Block processor: add flags to manage hashing & sparse block detectionDavid Oberhollenzer
This commit adds 2 new user settable flags to the block processor: - A flag to ignore sparse blocks and treat them like normal data blocks. - A flag to disable checksum computation altogether. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Support associating a user pointer with data blocksDavid Oberhollenzer
This commit modifies the block processor to support associating a user data pointer with data blocks that it forwards to the block writer, which is modified to accept an optional user data pointer. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Block processor: turn internal functions into interface entry pointsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Make the block processor inode management optionalDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29Turn the sqfs_block_writer_t into an interfaceDavid Oberhollenzer
This way, everything that could be done through the hooks (and more) can be done by simply providign a custom implementation. The result is a lot clener that the previous hook based version. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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