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7cc9112628
Parallel dio write takes a negative refcount of fi->iocachectr and so does
open of file in passthrough mode.
The refcount of passthrough mode is associated with attach/detach of a
fuse_backing object to fuse inode.
For parallel dio write, the backing file is irrelevant, so the call to
fuse_inode_uncached_io_start() passes a NULL fuse_backing object.
Passing a NULL fuse_backing will result in false -EBUSY error if the file
is already open in passthrough mode.
Allow taking negative fi->iocachectr refcount with NULL fuse_backing,
because it does not conflict with an already attached fuse_backing object.
Fixes: 4a90451bbc ("fuse: implement open in passthrough mode")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.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.