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4aa8cdd5e5
iomap_to_bh currently BUG()s when the passed in block number is not
in the iomap. For file systems that have proper synchronization this
should never happen and so far hasn't in mainline, but for block devices
size changes aren't fully synchronized against ongoing I/O. Instead
of BUG()ing in this case, return -EIO to the caller, which already has
proper error handling. While we're at it, also return -EIO for an
unknown iomap state instead of returning garbage.
Fixes: 487c607df7 ("block: use iomap for writes to block devices")
Reported-by: syzbot+4a08ffdf3667b36650a1@syzkaller.appspotmail.com
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.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.