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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>
2020-05-29cleanup: libsqfs: eliminate block writer statisticsDavid Oberhollenzer
- the "bytes submitted" can be moved over to the block processor - the number of blocks submitted are already there (implcitily, by adding the data block count to the fragment block count) - actual data bytes written can be computed from the super block - the remaining block count can be changed to simple counter that can be obtained through a function. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-29cleanup: libsqfs: remove hooks from sqfs_block_writer_tDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-21Fix the semantics of the super block deduplicationDavid Oberhollenzer
Its purely informational, but make sure other programs don't print out scary messages that imply the data has been ineficiently. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-05-04Expose more fine grained control values & flags on the XZ compressorDavid Oberhollenzer
This patch allows external users to fiddle with the XZ compressors compression strength, alignment and other values. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-04-16Propperly cast void pointer in sqfs_object_t inline functionDavid Oberhollenzer
Otherwise, C++ compilers will scream. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-22doxygen: fix some minor typosDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-22doxygen: propperly label generic inode helper functions as membersDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-05Get rid of sqfs_compressor_existsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-05Change the signature of sqfs_compressor_create to return an error codeDavid Oberhollenzer
Make sure the function has a way of telling the caller *why* it failed. This way, the function can convey whether it had an internal error, an allocation failure, whether the arguments are totaly nonsensical, or simply that the compressor *or specific configuration* is not supported. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-05Cleanup: Remove the E_ prefix from all libsquashfs enumeratorsDavid Oberhollenzer
Avoid namespace polution. Make sure all exportet symbols are prefixed with either sqfs_ or SQFS_. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-04Cleanup: match xattr reader API closer to id table APIDavid Oberhollenzer
Instead of creating everything in the "create" function, cleanup and create/initialize stuff in a "load" function. This allows the xattr reader to be reset/re-used and adds the benefit of not having to lug around references to the super block, compressor and file (altough the later two are hidden inside the meta reader). Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-04Add a generic copying mechanism to sqfs_object_tDavid Oberhollenzer
This patch adds a deep-copy callback to sqfs_object_t and removes the copying mechanism from sqfs_compressor_t. This is also interesting for other types. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-03-01Add a "do not deduplicate" block flagDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-27Add a function to the compressor interface to get the configurationDavid Oberhollenzer
This allows getting the compressor configuration back after creating it, for various purposes. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-23Remove the sqfs_inode_copy functionDavid Oberhollenzer
With unified payload size counters, copying an inode is now trivial. 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>
2020-02-23Unify the payload counters in the sqfs_inode_generic_tDavid Oberhollenzer
Instead of having seperate counters for blocks, dir index bytes and having to fiddle out the link target size, simply use a single value that stores the number of payload bytes used. A seperate "payload bytes available" is used for dynamically growing inodes during processing. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-22Add a seperate sqfs_block_processor_sync functionDavid Oberhollenzer
This function waits for all pending blocks to be written to disk, but doesn't flush the fragment block, so processing can continue afterwards as if nothing happened. 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>
2020-02-15Add a "sequence error" to libsquashfs error codesDavid Oberhollenzer
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>
2020-02-12Remove usage of sqfs_block_t from block readerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-12Clenaup: remove useage of sqfs_block_t from block writerDavid Oberhollenzer
The sqfs_block_t structure has been written for the block processor and exposes way too many internals. This commit removes its usage from the block writer, cutting it down to the bare essentials, so the structure can be removed from the public API later on. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-02-11Document the block writer API.David Oberhollenzer
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>
2020-02-10Cleanup: remove the fragment store/discard and block discard hooksDavid Oberhollenzer
There is no obvious non-footgun use for those other than tallying statistics, which is now done by the data structures themselves. 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>
2020-01-26Cleanup: Move fragment deduplication code over to fragment tableDavid Oberhollenzer
This removes further clutter from the data writer. Any future efforts on making fragment by hash lookup faster can focus on that area only and don't clutter the block processor. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-24Add a fragment table primitive to libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-20Add a flag field to the id table create functionDavid Oberhollenzer
Just to be safe in case there needs to be an extension in the future. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Cleanup: remove the payload pointers from sqfs_inode_generic_tDavid Oberhollenzer
There are 3 types of extra payload: - Directory index - File block sizes - Symlink target This commit removes the type specific pointers and modifies the code to use the payload area directly. To simplify the file block case and mitigate alignment issues, the type of the extra field is changed to sqfs_u32. For symlink target, the extra field can simply be cast to a character pointer (it had to be cast anyway for most uses). For block sizes, probably the most common usecase, it can be used as is. For directory indices, there is a helper function anyway. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Update explanation on directory index accountingDavid Oberhollenzer
Tests with the Debian image (which is generated with squashfs-tools, so should be interpreted as ground truth) have showed that the count is not stored off-by-one. The code was already doing the right thing, but the documentation was wrong. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Add a helper function to unpack directory index entriesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Add a start anchor parameter to sqfs_dir_reader_find_by_pathDavid Oberhollenzer
It optionally allows code that does tree traversal to start at an inode that it obtained previously and makes it easier to keep state externally. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-12Add an inode deep copy helper function to libsquashfsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-19Fix spelling mistakes found by lintianBenjamin Drung
Signed-off-by: Benjamin Drung <benjamin.drung@cloud.ionos.com>
2019-12-16Add ability to sqfs_dir_writer to create an export tableDavid Oberhollenzer
If the dir writer is used to create the directory table, it neccessarily sees every single inode number and coresponding location for all inodes that are referenced by the filesystem tree. This means it can easily collect that information internally to create an export table later on. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-11-28Cleanup: Return combined return value from compressor id by nameDavid Oberhollenzer
Instead of returning the ID through a pointer and an error code as return status, return a single int that could be a compressor ID (positive values) or an error code (negative values). Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-11-24Cleanup libsquashfs invalid argument error codesDavid Oberhollenzer
- Add an explicit "you're holding it wrong" error code. - Consistently return error codes and not have some special places where -1 is returned. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-11-24Cleanup: remove the entirely redundant sqfs_has_xattr functionDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-10-07Cleanup: consistent, fixed size data types for generic flag fieldsDavid Oberhollenzer
Instead of using int or unsigned int for generic function flag arguments, consistently use an unsigned, fixed size type. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-10-07Fix spelling of "align"David Oberhollenzer
Before the misspelled version has a chance to become stable API. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-10-07Improve ABI backward & forward compatibillityDavid Oberhollenzer
- Padd the compressor config union - 128 bytes aught to be enough for everyone, i.e. future compressors. - Insist that the padding space is initialized to 0. If a field gets added to an existing compressor, it can test for 0 as a sentinel value. - Add a size field to the hook structure, aka "the Microsoft way". - The explanation is in the comment. - Don't make the Microsoft mistake of checking for >=, insist on *exact* size match. Future users will need a fallback if their hooks are rejected. But at least they will be rejected instead of silently not being used. - Add an unsupported flag check to the dir tree reader. - Add a basic abi unit test that, for now, checks the size of the compressor config struct fields. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-10-03Add a counter-part to sqfs_inode_get_xattr_indexDavid Oberhollenzer
Combines all the type depenend attribute setting and inode type promotion into a single function. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-10-03Store directory index in generic inode structureDavid Oberhollenzer
This commit modifies the dir writer to store the directory index directly in the payload area of the inode it creates. The size of the index in bytes is stored in a seperate field. Storing the index is moved to the write inode function. The read inode function is in turn also modified to read the directory index from disk and actually store it in the inode structure in memory for later use. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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