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Qu Wenruo
2b14b74b99
Currently we use the following pattern to detect if the folio contains
the end of a file:
if (folio->index == end_index)
folio_zero_range();
But that only works if the folio is page sized.
For the following case, it will not work and leave the range beyond EOF
uninitialized:
The page size is 4K, and the fs block size is also 4K.
16K 20K 24K
| | | |
|
EOF at 22K
And we have a large folio sized 8K at file offset 16K.
In that case, the old "folio->index == end_index" will not work, thus
the range [22K, 24K) will not be zeroed out.
Fix the following call sites which use the above pattern:
- add_ra_bio_pages()
- extent_writepage()
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
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.