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33 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
34 * $FreeBSD: src/sys/ufs/ufs/ufs_ihash.c,v 1.20 1999/08/28 00:52:29 peter Exp $
35 * $DragonFly: src/sys/vfs/ufs/ufs_ihash.c,v 1.2 2003/06/17 04:28:59 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
42 #include <sys/vnode.h>
43 #include <sys/malloc.h>
46 #include <ufs/ufs/quota.h>
47 #include <ufs/ufs/inode.h>
48 #include <ufs/ufs/ufs_extern.h>
50 static MALLOC_DEFINE(M_UFSIHASH, "UFS ihash", "UFS Inode hash tables");
52 * Structures associated with inode cacheing.
54 static LIST_HEAD(ihashhead, inode) *ihashtbl;
55 static u_long ihash; /* size of hash table - 1 */
56 #define INOHASH(device, inum) (&ihashtbl[(minor(device) + (inum)) & ihash])
57 #ifndef NULL_SIMPLELOCKS
58 static struct simplelock ufs_ihash_slock;
62 * Initialize inode hash table.
68 ihashtbl = hashinit(desiredvnodes, M_UFSIHASH, &ihash);
69 simple_lock_init(&ufs_ihash_slock);
73 * Use the device/inum pair to find the incore inode, and return a pointer
74 * to it. If it is in core, return it, even if it is locked.
77 ufs_ihashlookup(dev, inum)
83 simple_lock(&ufs_ihash_slock);
84 for (ip = INOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next)
85 if (inum == ip->i_number && dev == ip->i_dev)
87 simple_unlock(&ufs_ihash_slock);
95 * Use the device/inum pair to find the incore inode, and return a pointer
96 * to it. If it is in core, but locked, wait for it.
99 ufs_ihashget(dev, inum)
103 struct proc *p = curproc; /* XXX */
108 simple_lock(&ufs_ihash_slock);
109 for (ip = INOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) {
110 if (inum == ip->i_number && dev == ip->i_dev) {
112 simple_lock(&vp->v_interlock);
113 simple_unlock(&ufs_ihash_slock);
114 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
119 simple_unlock(&ufs_ihash_slock);
124 * Insert the inode into the hash table, and return it locked.
130 struct proc *p = curproc; /* XXX */
131 struct ihashhead *ipp;
133 /* lock the inode, then put it on the appropriate hash list */
134 lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p);
136 simple_lock(&ufs_ihash_slock);
137 ipp = INOHASH(ip->i_dev, ip->i_number);
138 LIST_INSERT_HEAD(ipp, ip, i_hash);
139 ip->i_flag |= IN_HASHED;
140 simple_unlock(&ufs_ihash_slock);
144 * Remove the inode from the hash table.
150 simple_lock(&ufs_ihash_slock);
151 if (ip->i_flag & IN_HASHED) {
152 ip->i_flag &= ~IN_HASHED;
153 LIST_REMOVE(ip, i_hash);
155 ip->i_hash.le_next = NULL;
156 ip->i_hash.le_prev = NULL;
159 simple_unlock(&ufs_ihash_slock);