1 /* $NetBSD: ntfs_ihash.c,v 1.5 1999/09/30 16:56:40 jdolecek Exp $ */
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31 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
32 * $FreeBSD: src/sys/ntfs/ntfs_ihash.c,v 1.7 1999/12/03 20:37:39 semenu Exp $
35 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/kernel.h>
39 #include <sys/vnode.h>
40 #include <sys/malloc.h>
42 #include <sys/mount.h>
45 #include "ntfs_inode.h"
46 #include "ntfs_ihash.h"
48 MALLOC_DEFINE(M_NTFSNTHASH
, "NTFS nthash", "NTFS ntnode hash tables");
51 * Structures associated with inode cacheing.
53 static LIST_HEAD(nthashhead
, ntnode
) *ntfs_nthashtbl
;
54 static u_long ntfs_nthash
; /* size of hash table - 1 */
55 #define NTNOHASH(device, inum) (&ntfs_nthashtbl[(minor(device) + (inum)) & ntfs_nthash])
56 static struct lwkt_token ntfs_nthash_slock
;
57 struct lock ntfs_hashlock
;
60 * Initialize inode hash table.
65 int hsize
= vfs_inodehashsize();
67 lockinit(&ntfs_hashlock
, "ntfs_nthashlock", 0, 0);
68 ntfs_nthashtbl
= hashinit(hsize
, M_NTFSNTHASH
, &ntfs_nthash
);
69 lwkt_token_init(&ntfs_nthash_slock
, "ntfsihash");
73 * Free the inode hash table.
76 ntfs_nthash_uninit(struct vfsconf
*vfc
)
78 lwkt_gettoken(&ntfs_nthash_slock
);
80 hashdestroy(ntfs_nthashtbl
, M_NTFSNTHASH
, ntfs_nthash
);
81 lwkt_reltoken(&ntfs_nthash_slock
);
87 * Use the device/inum pair to find the incore inode, and return a pointer
88 * to it. If it is in core, return it, even if it is locked.
91 ntfs_nthashlookup(cdev_t dev
, ino_t inum
)
95 lwkt_gettoken(&ntfs_nthash_slock
);
96 for (ip
= NTNOHASH(dev
, inum
)->lh_first
; ip
; ip
= ip
->i_hash
.le_next
) {
97 if (inum
== ip
->i_number
&& dev
== ip
->i_dev
)
100 lwkt_reltoken(&ntfs_nthash_slock
);
106 * Insert the ntnode into the hash table.
109 ntfs_nthashins(struct ntnode
*ip
)
111 struct nthashhead
*ipp
;
113 lwkt_gettoken(&ntfs_nthash_slock
);
114 ipp
= NTNOHASH(ip
->i_dev
, ip
->i_number
);
115 LIST_INSERT_HEAD(ipp
, ip
, i_hash
);
116 ip
->i_flag
|= IN_HASHED
;
117 lwkt_reltoken(&ntfs_nthash_slock
);
121 * Remove the inode from the hash table.
124 ntfs_nthashrem(struct ntnode
*ip
)
126 lwkt_gettoken(&ntfs_nthash_slock
);
127 if (ip
->i_flag
& IN_HASHED
) {
128 ip
->i_flag
&= ~IN_HASHED
;
129 LIST_REMOVE(ip
, i_hash
);
131 ip
->i_hash
.le_next
= NULL
;
132 ip
->i_hash
.le_prev
= NULL
;
135 lwkt_reltoken(&ntfs_nthash_slock
);