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[ Upstream commit 81438498a285759f31e843ac4800f82a5ce6521f ] Because of integer division, we need to carefully calculate the disk offset. Consider the example below for a stripe of 6 volumes, a chunk size of 4096, and an offset of 70000. chunk = div_u64(offset, dev->chunk_size) = 70000 / 4096 = 17 offset = chunk * dev->chunk_size = 17 * 4096 = 69632 disk_offset_wrong = div_u64(offset, dev->nr_children) = 69632 / 6 = 11605 disk_chunk = div_u64(chunk, dev->nr_children) = 17 / 6 = 2 disk_offset = disk_chunk * dev->chunk_size = 2 * 4096 = 8192 Signed-off-by: Sergey Bashirov <sergeybashirov@gmail.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20250701122341.199112-1-sergeybashirov@gmail.com Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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 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.