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Remove dummy znode from zvol_state

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struct zvol_state contains a dummy znode, which is around 1KB on x64,
only for zfs_range_lock. But in reality, other than z_range_lock and
z_range_avl, zfs_range_lock only need znode on regular file, which
means we add 1KB on a structure and gain nothing.

In this patch, we remove the dummy znode for zvol_state. In order to
do that, we also need to refactor zfs_range_lock a bit. We move
z_range_lock and z_range_avl pair out of znode_t to form zfs_rlock_t.
This new struct replaces znode_t as the main handle inside the range
lock functions.

We also add pointers to z_size, z_blksz, and z_max_blksz so range lock
code doesn't depend on znode_t.  This allows non-ZPL consumers like
Lustre to use the range locks with their equivalent znode_t structure.

Signed-off-by: Chunwei Chen <david.chen@osnexus.com>
Signed-off-by: Boris Protopopov <boris.protopopov@actifio.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4510
This commit is contained in:
Chunwei Chen
2016-04-11 14:53:48 -07:00
committed by Brian Behlendorf
parent 61a3d06f84
commit d88895a069
8 changed files with 105 additions and 76 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/zfs_rlock.h
+31 -3
View File
@@ -32,7 +32,9 @@ extern "C" {
#ifdef _KERNEL
#include <sys/zfs_znode.h>
#include <sys/list.h>
#include <sys/avl.h>
#include <sys/condvar.h>
typedef enum {
RL_READER,
@@ -40,8 +42,16 @@ typedef enum {
RL_APPEND
} rl_type_t;
typedef struct zfs_rlock {
kmutex_t zr_mutex; /* protects changes to zr_avl */
avl_tree_t zr_avl; /* avl tree of range locks */
uint64_t *zr_size; /* points to znode->z_size */
uint_t *zr_blksz; /* points to znode->z_blksz */
uint64_t *zr_max_blksz; /* points to zsb->z_max_blksz */
} zfs_rlock_t;
typedef struct rl {
znode_t *r_zp; /* znode this lock applies to */
zfs_rlock_t *r_zrl;
avl_node_t r_node; /* avl node link */
uint64_t r_off; /* file range offset */
uint64_t r_len; /* file range length */
@@ -61,7 +71,8 @@ typedef struct rl {
* 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);
rl_t *zfs_range_lock(zfs_rlock_t *zrl, uint64_t off, uint64_t len,
rl_type_t type);
/* Unlock range and destroy range lock structure. */
void zfs_range_unlock(rl_t *rl);
@@ -78,6 +89,23 @@ void zfs_range_reduce(rl_t *rl, uint64_t off, uint64_t len);
*/
int zfs_range_compare(const void *arg1, const void *arg2);
static inline void
zfs_rlock_init(zfs_rlock_t *zrl)
{
mutex_init(&zrl->zr_mutex, NULL, MUTEX_DEFAULT, NULL);
avl_create(&zrl->zr_avl, zfs_range_compare,
sizeof (rl_t), offsetof(rl_t, r_node));
zrl->zr_size = NULL;
zrl->zr_blksz = NULL;
zrl->zr_max_blksz = NULL;
}
static inline void
zfs_rlock_destroy(zfs_rlock_t *zrl)
{
avl_destroy(&zrl->zr_avl);
mutex_destroy(&zrl->zr_mutex);
}
#endif /* _KERNEL */
#ifdef __cplusplus