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Diffstat (limited to 'uts/common/fs/zfs/sys/zfs_rlock.h')
-rw-r--r--uts/common/fs/zfs/sys/zfs_rlock.h69
1 files changed, 31 insertions, 38 deletions
diff --git a/uts/common/fs/zfs/sys/zfs_rlock.h b/uts/common/fs/zfs/sys/zfs_rlock.h
index 93733ba8a2b7..37a5594bbca0 100644
--- a/uts/common/fs/zfs/sys/zfs_rlock.h
+++ b/uts/common/fs/zfs/sys/zfs_rlock.h
@@ -22,6 +22,9 @@
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
+/*
+ * Copyright (c) 2018 by Delphix. All rights reserved.
+ */
#ifndef _SYS_FS_ZFS_RLOCK_H
#define _SYS_FS_ZFS_RLOCK_H
@@ -30,54 +33,44 @@
extern "C" {
#endif
-#ifdef _KERNEL
-
-#include <sys/zfs_znode.h>
-
typedef enum {
RL_READER,
RL_WRITER,
RL_APPEND
-} rl_type_t;
+} rangelock_type_t;
-typedef struct rl {
- znode_t *r_zp; /* znode this lock applies to */
- avl_node_t r_node; /* avl node link */
- uint64_t r_off; /* file range offset */
- uint64_t r_len; /* file range length */
- uint_t r_cnt; /* range reference count in tree */
- rl_type_t r_type; /* range type */
- kcondvar_t r_wr_cv; /* cv for waiting writers */
- kcondvar_t r_rd_cv; /* cv for waiting readers */
- uint8_t r_proxy; /* acting for original range */
- uint8_t r_write_wanted; /* writer wants to lock this range */
- uint8_t r_read_wanted; /* reader wants to lock this range */
-} rl_t;
+struct locked_range;
-/*
- * Lock a range (offset, length) as either shared (RL_READER)
- * or exclusive (RL_WRITER or RL_APPEND). RL_APPEND is a special type that
- * is converted to RL_WRITER that specified to lock from the start of the
- * end of file. Returns the range lock structure.
- */
-rl_t *zfs_range_lock(znode_t *zp, uint64_t off, uint64_t len, rl_type_t type);
+typedef void (rangelock_cb_t)(struct locked_range *, void *);
-/* Unlock range and destroy range lock structure. */
-void zfs_range_unlock(rl_t *rl);
+typedef struct rangelock {
+ avl_tree_t rl_tree; /* contains locked_range_t */
+ kmutex_t rl_lock;
+ rangelock_cb_t *rl_cb;
+ void *rl_arg;
+} rangelock_t;
-/*
- * Reduce range locked as RW_WRITER from whole file to specified range.
- * Asserts the whole file was previously locked.
- */
-void zfs_range_reduce(rl_t *rl, uint64_t off, uint64_t len);
+typedef struct locked_range {
+ rangelock_t *lr_rangelock; /* rangelock that this lock applies to */
+ avl_node_t lr_node; /* avl node link */
+ uint64_t lr_offset; /* file range offset */
+ uint64_t lr_length; /* file range length */
+ uint_t lr_count; /* range reference count in tree */
+ rangelock_type_t lr_type; /* range type */
+ kcondvar_t lr_write_cv; /* cv for waiting writers */
+ kcondvar_t lr_read_cv; /* cv for waiting readers */
+ uint8_t lr_proxy; /* acting for original range */
+ uint8_t lr_write_wanted; /* writer wants to lock this range */
+ uint8_t lr_read_wanted; /* reader wants to lock this range */
+} locked_range_t;
-/*
- * AVL comparison function used to order range locks
- * Locks are ordered on the start offset of the range.
- */
-int zfs_range_compare(const void *arg1, const void *arg2);
+void rangelock_init(rangelock_t *, rangelock_cb_t *, void *);
+void rangelock_fini(rangelock_t *);
-#endif /* _KERNEL */
+locked_range_t *rangelock_enter(rangelock_t *,
+ uint64_t, uint64_t, rangelock_type_t);
+void rangelock_exit(locked_range_t *);
+void rangelock_reduce(locked_range_t *, uint64_t, uint64_t);
#ifdef __cplusplus
}