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Chao Yu c465f52333 f2fs: fix to zero post-eof page 
commit ba8dac350f upstream.

fstest reports a f2fs bug:

#generic/363 42s ... [failed, exit status 1]- output mismatch (see /share/git/fstests/results//generic/363.out.bad)
#    --- tests/generic/363.out   2025-01-12 21:57:40.271440542 +0800
#    +++ /share/git/fstests/results//generic/363.out.bad 2025-05-19 19:55:58.000000000 +0800
#    @@ -1,2 +1,78 @@
#     QA output created by 363
#     fsx -q -S 0 -e 1 -N 100000
#    +READ BAD DATA: offset = 0xd6fb, size = 0xf044, fname = /mnt/f2fs/junk
#    +OFFSET      GOOD    BAD     RANGE
#    +0x1540d     0x0000  0x2a25  0x0
#    +operation# (mod 256) for the bad data may be 37
#    +0x1540e     0x0000  0x2527  0x1
#    ...
#    (Run 'diff -u /share/git/fstests/tests/generic/363.out /share/git/fstests/results//generic/363.out.bad'  to see the entire diff)
Ran: generic/363
Failures: generic/363
Failed 1 of 1 tests

The root cause is user can update post-eof page via mmap [1], however, f2fs
missed to zero post-eof page in below operations, so, once it expands i_size,
then it will include dummy data locates previous post-eof page, so during
below operations, we need to zero post-eof page.

Operations which can include dummy data after previous i_size after expanding
i_size:
- write
- mapwrite [1]
- truncate
- fallocate
 * preallocate
 * zero_range
 * insert_range
 * collapse_range
- clone_range (doesn’t support in f2fs)
- copy_range (doesn’t support in f2fs)

[1] https://man7.org/linux/man-pages/man2/mmap.2.html 'BUG section'

Cc: stable@kernel.org
Signed-off-by: Chao Yu <chao@kernel.org>
Reviewed-by: Zhiguo Niu <zhiguo.niu@unisoc.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2025-07-06 11:01:44 +02:00
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README 

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 reStructuredText 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.