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2019-07-16cleanup: move error handling into read_retryDavid Oberhollenzer
If read_retry fails to read the expected amount of data (EOF or otherwise), it is almost always an error. This commit renames read_retry to read_data and moves error handling into the function, making a lot of error handling code redundant. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-16cleanup: move error handling into write_retryDavid Oberhollenzer
If write_retry fails to write everything, it is *always* an error. This commit renames write_retry to write_data and moves error handling into the function, making a lot of error handling code redundant. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-16Fix directory index creationDavid Oberhollenzer
Digging around in kernel internals and mksquashfs reveals that it is actually a buffer offset into the raw directory buffer. The error hasn't been noted until now because of the bug fixed by a5428e0. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-15Add flags to data writer to micro manage behaviourDavid Oberhollenzer
The added flags allow controlling the following on a per file level: - forcing a file to be written uncompressed - forcing a file to not have a fragment, i.e. the last truncated block actually being written as a block - padding a file to be alligned to device block size The flags are not yet exposed to anything user controllable (such as command line flags). Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-12Add generic support for reading files without fragmentsDavid Oberhollenzer
This commit extends the special case handling for sparse files to generically support reading files that don't have a fragment but instead have a trunkated final block. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-12Simplify writer code for files without a fragmentDavid Oberhollenzer
The data writer sparse block code can take advantage that it can add a block size instead of a fragment and doesn't have to initialize the framgent location. In return, the tree node to inode serialization code doesn't need a special case for sparse file anymore and can now also handle files that are forced to not have a fragment. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-10Fix dirindex writing for ext dir inodeDavid Oberhollenzer
This commit makes sure we write the index count to the inode before writing out the inode itself. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-10libsqfs: eleminate use of temporary fileDavid Oberhollenzer
Tell the directory writer to keep the directory blocks in memory, then write them out once everything is done and the inodes are all written out. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-10Add a way to keep meta data blocks in memoryDavid Oberhollenzer
Instead of writing meta data blocks directly to disk, the writer can now alternatively keep the blocks in memory until explicitly told to write to disk. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-09Sanity check id table size read from super blockDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-07Actually encode/decode directory inode difference as signedDavid Oberhollenzer
The directory listing stores a signed difference of the inode number. Actually treating it as signed saves emitting extra headers if hard links or file deduplication are finally implemented. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-07read_inode: determine mode bits from inode typeDavid Oberhollenzer
Instead of insisting that mode bits and inode type match up, determine ignore the mode bits and determine them from the inode type. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-07Cleanup: merge inode type selection in inode writerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-06Cleanup: split off inode writer block list and dir index codeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-04Fix: simplify deduction logic for squashfs inode typeDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-04Fix: check block_log range before deriving block size from itDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-04Fix: actually check return value when writing xattrsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-04tar2sqfs: repack extended attributes into squashfs filesystemDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-02Add missing htole32 transformationsDavid Oberhollenzer
Assuming this code will ever see a big endian platform. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-02Fix directory index offset calculationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-07-01Make sure fragment and id tables are initializedDavid Oberhollenzer
In case the tables are not completely filled by reading from the squashfs image. Bug found using scan-build. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-30Add support for repacking condensed sparse filesDavid Oberhollenzer
This commit broadly does the following things: - Rename and move the sparse mapping structure to libutil - Add a function to the data writer for writing condensed versions of sparse files, given the mapping. - This shares code with the already existing function for regular files. The shared code is moved to a common helper function. - Add support to tar2sqfs for repacking sparse files. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add support for unpacking sparse files as sparse filesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Add support for packing sparse filesDavid Oberhollenzer
This commit adds support for packing sparse files into squashfs images as follows: - In the data writer: simply detect zero blocks and write a zero to the block size field and don't emit any data. Record the number of bytes saved this way. For fragments, set the fragment offset to invalid. - In the inode writer: write out the number of bytes saved for sparse files. If there should be a fragment but there is none, append a block count of 0. - In the data reader: if the block size is 0, read nothing from disk and emit an empty block. Do the same if the fragment is missing. - In the inode reader: restore the number of bytes saved for sparse files. The sparse files can be packed and unpacked, but the unpacking will not create sparse files for now. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Ommit fragment table if there really are no fragmentsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-28Fix inode fragment & sparse counter initializationDavid Oberhollenzer
The sparse attribute should be initialized with 0. It is subtracted from the file size in the kernel to determine the file size on disk to report to stat(2). So it actually didn't matter anyway (just for correctness sake). Second, the fragment index and offset should be set to 0xFFFFFFFF in the rare case that no fragments exist. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-22Cleanup: split fstree sort into 2 fstree independend functionsDavid Oberhollenzer
Make tree node list sort and recursive variant available and independend of the fstree_t. This is considered cleaner, since the fstree_t actually isn't needed for any of this and we can just call the recusvie sort on the root instead, and we can use the sort implementation directly for things like the upcoming unit test. Also this commit splits up the merge/sort implementation into a seperate split and merge functions to make the code somewhat more readable. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-19Cleanup fstree codeDavid Oberhollenzer
Replace default_$FIELD with a struct stat. Merge the rest of add_node/add_file into mknode and add by path+stat. Expose the mknode function and replace all the duplicated node pointer arithmetic magic with a call to mknode. Plus a generic cleanup by utlizing new util functions. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-15Move super block version check to sqfs_super_readDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move file extraction code to generic data_reader_t in libsquashfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move write_xattr to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-11Move data writer to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-10cleanup: move tree deserialization to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-10Rename table.h to highlevel.hDavid Oberhollenzer
The idea is to move various higher level helper functions there. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-06-10cleanup: move entire fstree serialization to libsqfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-20cleanup: internalize frag_reader_t implementationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-20cleanup: internalize meta reader/writer implementationsDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-20Get rid of unalligned pointersDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-19rdsquashfs: fix read_inode_slink_ext returnDavid Oberhollenzer
Return the actual object, not 0. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-04Remove compressor internal buffersDavid Oberhollenzer
Pass in an external destination buffer + size and allow for propper bounds checking (especially when unpacking). Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-03Add utility functions to read the fragment data from an imageDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-03Add helper function for reading dir entries to meta readerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-03Add function to read generic inode from meta data readerDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02unsquashfs: read ID table from fileDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02Add meta data reader implementationDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02Add unsquashfs stubDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02cleanup roundDavid Oberhollenzer
- remove debug prints - move id table write out to id table code - dummy remove wrapper function for fragment table Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02Write out the missing tablesDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02Add id table code stubDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2019-05-02Move super block init/write code to libsquashfs.aDavid Oberhollenzer
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
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