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commitc571fbb5b5upstream. This patch adds a helper function to check if compression level is valid. Meanwhile, this patch fixes a reported issue [1]: The issue is easily reproducible by: 1. dd if=/dev/zero of=test.img count=100 bs=1M 2. mkfs.f2fs -f -O compression,extra_attr ./test.img 3. mount -t f2fs -o compress_algorithm=zstd:6,compress_chksum,atgc,gc_merge,lazytime ./test.img /mnt resulting in [ 60.789982] F2FS-fs (loop0): invalid zstd compress level: 6 A bugzilla report has been submitted in https://bugzilla.kernel.org/show_bug.cgi?id=218471 [1] https://lore.kernel.org/lkml/ZcWDOjKEnPDxZ0Or@google.com/T/ The root cause is commit00e120b5e4("f2fs: assign default compression level") tries to check low boundary of compress level w/ zstd_min_clevel(), however, since commite0c1b49f5b("lib: zstd: Upgrade to latest upstream zstd version 1.4.10"), zstd supports negative compress level, it cast type for negative value returned from zstd_min_clevel() to unsigned int in below check condition, result in repored issue. if (level < zstd_min_clevel() || ... This patch fixes this issue by casting type for level to int before comparison. Fixes:00e120b5e4("f2fs: assign default compression level") Signed-off-by: Sheng Yong <shengyong@oppo.com> Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> Signed-off-by: Chao Yu <chao@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.