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locks: add lock cancel command

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Lock managers need to be able to cancel pending lock requests.  In the case
where the exported filesystem manages its own locks, it's not sufficient just
to call posix_unblock_lock(); we need to let the filesystem know what's
happening too.

We do this by adding a new fcntl lock command: FL_CANCELLK.  Some day this
might also be made available to userspace applications that could benefit from
an asynchronous locking api.

Signed-off-by: Marc Eshel <eshel@almaden.ibm.com>
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
This commit is contained in:
Marc Eshel
2007-01-18 17:52:58 -05:00
committed by J. Bruce Fields
parent 150b393456
commit 9b9d2ab415
3 changed files with 21 additions and 0 deletions
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4
include/linux/fcntl.h
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@@ -3,6 +3,10 @@
#include <asm/fcntl.h>
/* Cancel a blocking posix lock; internal use only until we expose an
* asynchronous lock api to userspace: */
#define F_CANCELLK (F_LINUX_SPECIFIC_BASE+5)
#define F_SETLEASE (F_LINUX_SPECIFIC_BASE+0)
#define F_GETLEASE (F_LINUX_SPECIFIC_BASE+1)