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Add a "try" operation for range locks

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zfs_rangelock_tryenter() bails immediately instead of waiting for the
lock to become available.  This will be used to resolve a deadlock in
the FreeBSD page-in code.  No functional change intended.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Mark Johnston <markj@FreeBSD.org>
Closes #10519
This commit is contained in:
Mark Johnston
2020-06-30 15:35:29 -04:00
committed by Brian Behlendorf
parent a4b0a74c7f
commit 6e00561712
2 changed files with 49 additions and 18 deletions
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include/sys/zfs_rlock.h
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@@ -71,6 +71,8 @@ void zfs_rangelock_fini(zfs_rangelock_t *);
zfs_locked_range_t *zfs_rangelock_enter(zfs_rangelock_t *,
uint64_t, uint64_t, zfs_rangelock_type_t);
zfs_locked_range_t *zfs_rangelock_tryenter(zfs_rangelock_t *,
uint64_t, uint64_t, zfs_rangelock_type_t);
void zfs_rangelock_exit(zfs_locked_range_t *);
void zfs_rangelock_reduce(zfs_locked_range_t *, uint64_t, uint64_t);