Konstantin Belousov fa3bd463ce lockf: ensure atomicity of lockf for open(O_CREAT|O_EXCL|O_EXLOCK)
or EX_SHLOCK.  Do it by setting a vnode iflag indicating that the locking
exclusive open is in progress, and not allowing F_LOCK request to make
a progress until the first open finishes.

Requested by:	mckusick
Reviewed by:	markj, mckusick
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D28697
2021-02-18 01:22:05 +02:00
..
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