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b1e09178b7
When completing a CoW-based write, each extent range mapping update is covered by a separate transaction. For a CoW-based atomic write, all mappings must be changed at once, so change to use a single transaction. Note that there is a limit on the amount of log intent items which can be fit into a single transaction, but this is being ignored for now since the count of items for a typical atomic write would be much less than is typically supported. A typical atomic write would be expected to be 64KB or less, which means only 16 possible extents unmaps, which is quite small. Reviewed-by: Darrick J. Wong <djwong@kernel.org> [djwong: add tr_atomic_ioend] Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: John Garry <john.g.garry@oracle.com> |
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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.