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This fixes problems with emulating flock() with POSIX locking.
Reported by Sebastian Pipping.
As with lock/setlk/getlk most filesystems don't need to implement
this, as the kernel takes care of file locking. The only reason to
implement locking operations is for network filesystems which want
file locking to work between clients.
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Add a new read_buf() method to the highlevel API. This allows
returning a generic buffer from the read method, which in turn allows
zero copy reads.
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Add new write_buf() method to the highlevel API. Similarly to the
lowlevel write_buf() method, this allows implementing zero copy
writes.
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need not be calculated for the following operations: read, write,
flush, release, fsync, readdir, releasedir, fsyncdir, ftruncate,
fgetattr, lock, ioctl and poll.
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operations with a NULL path argument, if the filesystem supports it
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