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2020-01-24Cleanup: remove single use helper functions from data writerDavid Oberhollenzer
This commit moves the single use helper functions that are called from worker thread context into the worker thread function. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-24Cleanup: use the frag table data type in the data readerDavid Oberhollenzer
Instead of doing everything by manually. 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>
2020-01-19Add a helper function to unpack directory index entriesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-19Fix directory index accounting when reading inodesDavid 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>
2020-01-06Cleanup: use parse_size function to parse compressor optionsDavid Oberhollenzer
The XZ option parser had a similar function to parse_size. This commit removes the other implementation and extends parse_size with the one missing feature, i.e. allowing a '%' suffix for a relative value. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2020-01-02Support parsing [device] block size argument with SI suffixDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-30Fix zlib paths in automake fileDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-29Add a small version of zlib that can be built in staticallyDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-28Add a small version of liblz4 that can be built in staticallyDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-23Simplify hard link handlingDavid Oberhollenzer
- For now, enforce that hard links don't point to a directories. - Instead of doing the swaping trickery, just reorder the flat list and hand out new inode numbers. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-23Minor cleanup in inode allocationDavid Oberhollenzer
- Remove unnecessary counter argument, we already have the total count. - Remove the return status, there is no failure branch. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-23Add libtar.a function to create hardlink recordsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-23Add simple sqfs_tree_node_t hardlink detection to libcommonDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-23Bring back the flat list of inodes in libfstreeDavid Oberhollenzer
It makes further processing simpler and doesn't leak the abstraction into upper layers. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-22Add hard link support to gensquashfs and tar2sqfsDavid Oberhollenzer
In libtar, set a special flag if the header is actually a hard link. In tar2sqfs, create a hard link node and skip the rest for hard links. Also refues to set the root attributes from a hard link, it may refere to a node that we have missed earlier, there is nothing else that we can do here. In fstree_from_file, add a "link" command for adding hard links. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-22Add basic support for handling and serializing hard linksDavid Oberhollenzer
In libfstree, add a function to add a hard link to the fstree. The hard links stores the target in the data.target field, canonicalizes the target and sets a sentinel mode. A second function is used to resolve link, i.e. replacing it with a direct pointer, setting another sentinel mode and increasing the targets link count. The post process function tries to resolve unresolved hard links and only allocates inode numbers for nodes that aren't hard links. If the target node of a hard link does not have an inode number yet, the two need to be swapped, since this is also the order in which they are serialized. The serialization function in libcommon simply has to skip hard link nodes and when writing directory entries, use the inode num/ref of the target node. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-19Split the libfstree add_by_path tree traversal function outDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-19Fix link count for file inodes in tree serialization.David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-18Add an explicit link count to the fstree nodesDavid Oberhollenzer
Gets initialized to 2 for directories, 1 for all other types. The count of the parent node is automatically incremented. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-18Rename fstree "slink_target" to "target"David Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-18Move is_filename_sane to libfstree, add test casesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-18Cleanup: internalize some fstree functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-18Cleanup: merge the fstree post processing functionsDavid Oberhollenzer
Instead of having 3 different functions for sorting the tree, numbering the nodes and generating a file list, that all have to be used in the right order, this commit merges them into a single "fstree_post_process" function. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-16Remove fstree inode tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-16Do the fstree serialization in a recursive tree walkDavid Oberhollenzer
Remove usage of the "inode table". Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-16Use the sqfs_dir_writer_t to create the NFS export tableDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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>
2019-12-16Cleanup: split sqfs_serialize_fstree into smaller functionsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-15Fix tar GNU sparse header parsingDavid Oberhollenzer
Extract the filename correctly. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-13Better support for reading/writing non-ASCII xattr values from/to tarDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-13Make the PAX header parser more strictDavid Oberhollenzer
Actually parse the length field and insist it matches the line length, then use the length field to advance to the next line. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-13Fix name of libsquashfs pkg-config fileDavid Oberhollenzer
This fixes both the name inside the file, as well as the file name by adding the major version suffix. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-13Merge windows and pthread thread pool implementationsDavid Oberhollenzer
Since they are both structured the same way using condition variables, they are only a few defines away from removing code duplication. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-13Cleanup data writerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-12Don't kick off the threads until the queue is fullDavid Oberhollenzer
The idea is as follows: Initially let the user submit blocks until the queue is filled, then kick of the threads. Every thread will end up getting a block without any waits until they completely deplete the queue. Assuming the threads take longer to process the data than it takes the main thread to do I/O and submit new blocks, the queue should stay mostly filled with minimal wait times. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-12Fix thread pool queue accountingDavid Oberhollenzer
- ONLY manipulate the back log counter in the main thread. - Fix the order of operations when submitting blocks. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-12Fix out of bounds writes in lzo compressorDavid Oberhollenzer
The liblzo compression functions don't do any bounds checking, instead they expect the destination buffer to be large enough to hold the worst case encoding. This commit modifies the lzo compressor to use a scratch buffer for compression (with worst case size) and only copy to the actual destination if the result fits. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-12Fix "buffer to small" being treated as error in zstd compressorDavid Oberhollenzer
The zstd compress function returns an error code if it cannot fit the compressed data into the given destination buffer. This commit adds a check for this error and reports that the libsquashfs compressor implementation was unable to shrink the input instead of claiming a fatal error happened. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-12Fix: programs linking against libsquashfs also need pthreadDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-09Only check for OS specific bad filenames when unpackingDavid Oberhollenzer
When converting a SquashFS image to a tarball, it makes no sense to refuse conversion if the filename is considered evil by the OS. This patch adds an option to is_filename_sane to check if the OS has a problem with the given file name. sqfs2tar sets it to false and converts everything while rdsquashfs sets it to true when unpacking. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-08Replace SetEvent synchronization with condition variablesDavid Oberhollenzer
It's cleaner, more stable and works pretty much the same way as the pthread version. The downside is that the minimum target for the library is now Windows Vista, or Server 2008. But both are over a decade old anyway, so this shouldn't be an issue. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-08Fix Windows file creation modeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-08Add native Windows port of the multi-threaded data writerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-05Minor data writer cleanupDavid Oberhollenzer
Move "do block" function over to the rest of the block related code and internalizie the pthread worker structure. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-12-05Fix pthread data writer interfering with signal handlingDavid Oberhollenzer
If a signal is sent to a process, the POSIX spec says that ANY thread could be picked ARBITRARILY to handle the signal. In our case this could be one of the internal worker threads. The problem here is that an unsuspecting user of the library might suddenly have their signal handler run in parallel to their main thread and run into weird concurrency issues, because they didn't expect that to happen. In fact, the libsquashfs API tries to be transparent about whether or not it uses a thread pool internally and does everything other than number crunching (e.g. I/O that may happen through user supplied callbacks) in the same thread as the one that submitts the blocks. Unfortunately, pthread doesn't have a way to set a signal mask for the new thread and setting it inside the thread is racy (i.e. a signal might be delivered before the worker thread sets the mask). The only portable and non-racy way to do this, is to disable all signals in the calling thread that sets up the data writer, create the threads (which will inherit the mask) and then resetore the previous signal mask, hoping for the best. The downside to this is that signals may be lost in that short time. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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