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path: root/lib/sqfs/block_processor/internal.h
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2021-03-23block processor: keep duplicate copies of in-flight fragment blocksDavid Oberhollenzer
If we want full, byte-for byte, verification of fragments during de-duplication we need to check back with the blocks already written to disk, or with the ones that are in flight. The previous, extremely hacky approach simply locked up the thread pool and investigated the queues. For the new approach, we treat the thread pool as completely opaque and don't try to touch it. This commit modifies the block processor to keep duplicate copies of each submitted fragment block around, that are cleaned up once the block is dequeued and written to disk. So instead of touching the thread pool, we can simply investigate the in-fligth-block list and the current block, before resorting to reading back fragment blocks from the file. 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>
2021-03-21Cleanup: 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>
2021-01-19libsqfs: Implement exact matching of fragmentsDavid 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>
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>
2020-05-29Block processor: merge finish & sync functionsDavid Oberhollenzer
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>
2020-05-29Support 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>
2020-05-23block processor: move the block consolidation to the worker threadDavid Oberhollenzer
Instead of merging fragments into the fragment block inside the process_completed_fragment function, store a linked list of fragments in the fragment block and do the actual merging (several memcpy calls totaling of up to 1M of data in worst case) in the worker thread instead of the locked, serial path. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-23block processor: recycle blocks to reduce allocation pressureDavid Oberhollenzer
Instead of freeing/allocating blocks all the time in the locked, serial path, use a free list to "recycle" blocks. Once a block is no longer used, throw it onto the free list. If a new block is, needed try to get one from the free list before calling malloc. After a few iterations, the block processor should stop allocating new blocks and only re-use the ones it already has. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-18Cleanup: Move xxhash32 code to libutilDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-23Turn file inode management completely over to the block processorDavid Oberhollenzer
If the block processor allocates and dynamically resizes inodes on the fly, we can add data indefinitely without knowing the size of the file ahead of time. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-21Cleanup: move utilities back out of libsquashfsDavid Oberhollenzer
This commit removes the allocation helpers and string table functions out of libsquashfs back into a "libutil.a". The problem of libsquashfs exporting stuff that it shouldn't is resolved by retaining the internal attributes and directly adding the source to libsquashfs instead of trying to somehow link against libutil.la. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-20Restructure thread pool block processorDavid Oberhollenzer
Implement the io-queue based design as outline in doc/parallelism.txt Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-16block processor: move the internals to the respective implementationsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-16Replace crc32 with xxhash32David Oberhollenzer
On the one hand, benchmarking and profiling determined xxhash32 to be faster than the zlib implementation of crc32, on the other hand profiling determined that crc32 computation contributed signifficantly to the overall runtime. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-16Move all the queue-waiting logic to the thread pool implemenationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-15Move block block accounting to the other end of the block pipelineDavid Oberhollenzer
This commit moves all of the fragment/block accounting in the block processor over to the writing end of the pipeline. In order to do this, the sparse blocks are allowed to bubble through the pipeline. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-15Cleanup: block processor: move init/cleanup functions into implemenationsDavid Oberhollenzer
Again, the generic init/cleanup functions do way too many things that are specific to the thread pool implementation. Thanks to the splitting up of the block processor, they also have become quite trivial. This commit moves those functions into their respective implementations, allowing even further simplificiation. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-15Cleanup: block processor: remove test_and_set_statusDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-15Cleanup: block processor: remove delayed thread notificationDavid Oberhollenzer
Under the assumption that block processing is CPU bound and not I/O bound, this is entirely useless. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Implement a more explicit object systemDavid Oberhollenzer
Make every dynamically allocated, opaque data structure inherit from a common sqfs_object_t structure with common entry points (e.g. destroy). This removes tons of public API functions and replaces them with a simple sqfs_destroy instead. If semantics of the (until now implicit) object system need to be extended, it can be much more conveniantely done this way. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Cleanup: Move sqfs_block_t to block processor internalsDavid Oberhollenzer
It was basically built around the block processor and exposed way too many internals. Removing it from other places was mostly trivial. This commit completely removes it from the public API and even most of the libsquashfs internals. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Cleanup: remove block hooks entirely from block processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-10Add run time statistics to the block writer and processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-09Move block writer and fragment table management out of block processorDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-31Split the block writing/deduplication away from the block processorDavid Oberhollenzer
This commit moves the entire block writing and deduplication of data blocks over to a different data type named "block writer". For simplicity, the interfaces of the block processor are left as is and are turned into warppers. Likewise, most of the code in the block writer is just verbatim from the block processor, to be cleaned up in subsequent commits. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-29Rename sqfs_data_writer_t back to sqfs_block_processor_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>