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574817d6c0
The tape device driver uses a single idal_buffer for I/O. While the buffer itself can be arbitrary big, the limit for data transfer for a single Channel-Command Word is at 65535 bytes (64K-1) since the count field specifying the amount of data designated by the CCW is a 16-bit unsigned value. Provide functionality that allocates an array of multiple IDAL buffer with the limitation mentioned above in mind. A call to idal_buffer_array_alloc() allocates an array with a certain amount of IDAL buffers which is determined based on the total size of @size. Each individual buffer is limited to a size of CCW_MAX_BYTE_COUNT (65535 bytes). Add helper functions that determine the size (# of elements) and the total data size covered by the array as well. Current users of the single IDAL buffer are adapted to use the new functions with one buffer to allocate. The single IDAL buffer is removed from the tape_char_data struct. Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com> Reviewed-by: Jens Remus <jremus@linux.ibm.com> Signed-off-by: Heiko Carstens <hca@linux.ibm.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.