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https://en.wikipedia.org/wiki/Squash_FS
The original version of Squashfs used gzip compression, although Linux kernel 2.6.34 added support for LZMA and LZO compression, Linux kernel 2.6.38 added support for LZMA2 compression (which is used by xz), and Linux kernel 3.19 added support for LZ4 compression. Support for Zstandard was added in Linux Kernel 4.14.Max. file size: 16 EiB (2⁶⁴) bytes
https://squashfs-lzma.org/
Squashfs' author couldn't support LZMA directly in squashfs source code. He wanted to have the squashfs code included in official Linux Kernel, but Linux Kernel didn't support LZMA/XZ at that time, so adding LZMA to squashfs would decrease the chance for its (squashfs's) inclusion.
https://source.android.com/devices/architecture/kernel/squashfs
Optimizing SquashFS at the Kernel Level (up to Android 9) Important: SquashFS is supported for Android kernels up to version 4.14. The feature has been removed from all kernels available for Android 10 (android-4.9-q, android-4.14-q and android-4.19-q) and is no longer available.
https://github.com/microsoft/WSL/issues/4123
Jun 13, 2019 · While WSL2 doesn't have the issues with snapd described in #2374, we now have another blocker. snap install now fails after downloading the snap, as it is unable to mount it, since the WSL 2 kernel doesn't contain squashfs support. (Per /proc/filesystems and the obvious test:
http://www.tldp.org/HOWTO/SquashFS-HOWTO/gettingready.html
If your kernel source is from a distro vendor, it may be already pre-patched with custom vendor patches, and patching with a SquashFS patch will almost surely not work, as SquashFS patches are made against original Linux kernels. However some distributions make avaliable SquashFS-kernel-modules and SquashFS-tools packages from the repositories.
https://elinux.org/Squashfs_support_for_MTD_subsystem
Write a user-space utility that writes Squashfs filesystems to NAND, skipping bad blocks (and record that bad bocks have been skipped in the out of band data). Re-write the low-level squashfs_read_data() routine in the kernel squashfs code to read directly from NAND using MTD.
https://elinux.org/Squash_FS_Howto
SquashFS is distributed as a Linux kernel source patch (which enables SquashFS read support in your kernel), and the mksquashfs tool, which creates squashed file systems (in a file or on a block device). The latest SquashFS release tree is 2.x, the former one was 1.x.
https://github.com/torvalds/linux/commit/87bf54bb43ddd385d2538b777324bf737f243042
Add zstd compression and decompression support to SquashFS. zstd is a great fit for SquashFS because it can compress at ratios approaching xz, while decompressing twice as fast as zlib. For SquashFS in particular, it can decompress as fast as lzo and lz4. It also has the flexibility to turn down the compression ratio for faster compression times.
http://www.tldp.org/HOWTO/html_single/SquashFS-HOWTO/
SquashFS is distributed as a Linux kernel source patch (which enables SquashFS read support in your kernel), the mksquashfs tool, which creates squashed file systems (in a file or on a block device) and the unsquashfs tool, which extracts multiple files from an existing squashed file system. The latest SquashFS release tree is 3.x, the former ...
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