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e63bf231d1
There is no need to arbitrarily limit the size of a report zone to the number of zones defined by SD_ZBC_REPORT_MAX_ZONES. Rather, simply calculate the report buffer size needed for the requested number of zones without exceeding the device total number of zones. This buffer size limitation to the hardware maximum transfer size and page mapping capabilities is kept unchanged. Starting with this initial buffer size, the allocation is optimized by iterating over decreasing buffer size until the allocation succeeds (each iteration is allowed to fail fast using the __GFP_NORETRY flag). This ensures forward progress for zone reports and avoids failures of zones revalidation under memory pressure. While at it, also replace the hard coded 512 B sector size with the SECTOR_SIZE macro. Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Christoph Hellwig <hch@lst.de> Acked-by: Martin K. Petersen <martin.petersen@oracle.com> Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk> |
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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 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.