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2022-08-19Fix: libfstree: actually use a full 32 bit hard link counterDavid Oberhollenzer
The squashfs on-disk format uses 32 bit link counters, but the fstree used 16 bit ones. Because the link count also includes child nodes, this artificially limited the number of entries in a directory to ~64k files. This patch removes the limit by switching libfstree to 32 bit counters. Reported-by: Marvin Renich <mrvn@renich.org> Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>
2021-06-25libfstree: guard against link count and inode number overflowDavid Oberhollenzer
If the hard link counter or the inode number counter overflow the maximum representable value (for SquashFS 16 bit and 32 bit respecitively), abort with an error message. 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>
2019-12-22Add 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>