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e3a7c2947b
Commitb32d45824a("dm bufio: Add DM_BUFIO_CLIENT_NO_SLEEP flag") added a "NO_SLEEP" mode, it replaces a mutex with a spinlock, and it is only usable when the device is in read-only mode (because the write path may be sleeping while holding the dm_bufio_client lock). However, there are still two points where the code could sleep even in read-only mode. One is in __get_unclaimed_buffer -> __make_buffer_clean. The other is in __try_evict_buffer -> __make_buffer_clean. These functions will call __make_buffer_clean which sleeps if the buffer is being read. Fix these cases so that if c->no_sleep is set __make_buffer_clean will not be called and the buffer will be skipped instead. Fixes:b32d45824a("dm bufio: Add DM_BUFIO_CLIENT_NO_SLEEP flag") Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Mike Snitzer <snitzer@kernel.org>
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.