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87d6aaf79b
At btrfs_do_readpage() if we get an extent map for a prealloc extent we end up assigning twice to the 'block_start' variable, first the value returned by extent_map_block_start() and then EXTENT_MAP_HOLE. This is pointless so make it more clear by using an if-else statement and doing only one assignment. Also, while at it, move the declaration of 'block_start' into the while loop's scope, since it's not used outside of it and the related 'disk_bytenr' is also declared in this scope. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Filipe Manana <fdmanana@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.