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forkables: Keep hardlinks disabled via shared mem.

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To avoid the need for each process to check the filesystem to detect
that hardlink creation is impossible or disabled, cache this fact in
shared memory.  Removing cygfork directory while in use does disable
hardlinks creation.  To (re-)enable hardlinks creation, the cygfork
directory has to exist before the first cygwin process does fork.

	* forkable.cc (dll_list::forkable_ntnamesize): Short cut
	forkables needs to impossible when disabled via shared memory.
	(dll_list::update_forkables_needs): When detecting hardlink
	creation as impossible (not on NTFS) while still (we are the
	first one checking) enabled via shared memory, disable the
	shared memory value.
	(dll_list::request_forkables): Disable the shared memory value
	when hardlinks creation became disabled, that is when the
	cygfork directory was removed.
	* include/cygwin/version.h: Bump CYGWIN_VERSION_SHARED_DATA 6.
	* shared_info.h (struct shared_info): Add member
	prefer_forkable_hardlinks.  Update CURR_SHARED_MAGIC.
	* shared.cc (shared_info::initialize): Initialize
	prefer_forkable_hardlinks to 1 (Yes).
This commit is contained in:
Michael Haubenwallner
2016-12-07 11:58:29 +01:00
committed by Corinna Vinschen
parent ece7282f32
commit 5a41aa6f4d
3 changed files with 16 additions and 2 deletions
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2
winsup/cygwin/include/cygwin/version.h
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@ -518,7 +518,7 @@ details. */
regions. It is incremented when incompatible changes are made to the shared
memory region *or* to any named shared mutexes, semaphores, etc. */
#define CYGWIN_VERSION_SHARED_DATA 5
#define CYGWIN_VERSION_SHARED_DATA 6
/* An identifier used in the names used to create shared objects. The full
names include the CYGWIN_VERSION_SHARED_DATA version as well as this