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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 $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
41 #include <sys/vnode.h>
42 #include <sys/malloc.h>
45 #include <ufs/ufs/quota.h>
46 #include <ufs/ufs/inode.h>
47 #include <ufs/ufs/ufs_extern.h>
49 static MALLOC_DEFINE(M_UFSIHASH, "UFS ihash", "UFS Inode hash tables");
51 * Structures associated with inode cacheing.
53 static LIST_HEAD(ihashhead, inode) *ihashtbl;
54 static u_long ihash; /* size of hash table - 1 */
55 #define INOHASH(device, inum) (&ihashtbl[(minor(device) + (inum)) & ihash])
56 #ifndef NULL_SIMPLELOCKS
57 static struct simplelock ufs_ihash_slock;
61 * Initialize inode hash table.
67 ihashtbl = hashinit(desiredvnodes, M_UFSIHASH, &ihash);
68 simple_lock_init(&ufs_ihash_slock);
72 * Use the device/inum pair to find the incore inode, and return a pointer
73 * to it. If it is in core, return it, even if it is locked.
76 ufs_ihashlookup(dev, inum)
82 simple_lock(&ufs_ihash_slock);
83 for (ip = INOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next)
84 if (inum == ip->i_number && dev == ip->i_dev)
86 simple_unlock(&ufs_ihash_slock);
94 * Use the device/inum pair to find the incore inode, and return a pointer
95 * to it. If it is in core, but locked, wait for it.
98 ufs_ihashget(dev, inum)
102 struct proc *p = curproc; /* XXX */
107 simple_lock(&ufs_ihash_slock);
108 for (ip = INOHASH(dev, inum)->lh_first; ip; ip = ip->i_hash.le_next) {
109 if (inum == ip->i_number && dev == ip->i_dev) {
111 simple_lock(&vp->v_interlock);
112 simple_unlock(&ufs_ihash_slock);
113 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p))
118 simple_unlock(&ufs_ihash_slock);
123 * Insert the inode into the hash table, and return it locked.
129 struct proc *p = curproc; /* XXX */
130 struct ihashhead *ipp;
132 /* lock the inode, then put it on the appropriate hash list */
133 lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p);
135 simple_lock(&ufs_ihash_slock);
136 ipp = INOHASH(ip->i_dev, ip->i_number);
137 LIST_INSERT_HEAD(ipp, ip, i_hash);
138 ip->i_flag |= IN_HASHED;
139 simple_unlock(&ufs_ihash_slock);
143 * Remove the inode from the hash table.
149 simple_lock(&ufs_ihash_slock);
150 if (ip->i_flag & IN_HASHED) {
151 ip->i_flag &= ~IN_HASHED;
152 LIST_REMOVE(ip, i_hash);
154 ip->i_hash.le_next = NULL;
155 ip->i_hash.le_prev = NULL;
158 simple_unlock(&ufs_ihash_slock);