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29 * @(#)ufs_ihash.c 8.7 (Berkeley) 5/17/95
30 * $FreeBSD: src/sys/ufs/ufs/ufs_ihash.c,v 1.20 1999/08/28 00:52:29 peter Exp $
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/vnode.h>
38 #include <sys/malloc.h>
40 #include <sys/mount.h>
44 #include "ufs_extern.h"
47 static MALLOC_DEFINE(M_UFSIHASH, "UFS ihash", "UFS Inode hash tables");
49 #define INOHASH(ump, inum) \
50 (&ump->um_ihashtbl[inum & ump->um_ihash])
53 * Initialize inode hash table.
56 ufs_ihashinit(struct ufsmount *ump)
58 u_long target = desiredvnodes / 4 + 1;
61 while (ump->um_ihash < target)
63 ump->um_ihashtbl = kmalloc(sizeof(void *) * ump->um_ihash, M_UFSIHASH,
69 ufs_ihashuninit(struct ufsmount *ump)
71 if (ump->um_ihashtbl) {
72 kfree(ump->um_ihashtbl, M_UFSIHASH);
73 ump->um_ihashtbl = NULL;
78 * Use the device/inum pair to find the incore inode, and return a pointer
79 * to it. If it is in core, return it, even if it is locked.
82 ufs_ihashlookup(struct ufsmount *ump, cdev_t dev, ino_t inum)
84 struct inode *ip = NULL;
86 for (ip = *INOHASH(ump, inum); ip; ip = ip->i_next) {
87 if (inum == ip->i_number && dev == ip->i_dev)
96 * Use the device/inum pair to find the incore inode, and return a pointer
97 * to it. If it is in core, but locked, wait for it.
99 * This subroutine may block.
102 ufs_ihashget(struct ufsmount *ump, cdev_t dev, ino_t inum)
108 for (ip = *INOHASH(ump, inum); ip; ip = ip->i_next) {
109 if (inum != ip->i_number || dev != ip->i_dev)
112 if (vget(vp, LK_EXCLUSIVE))
115 * We must check to see if the inode has been ripped
116 * out from under us after blocking.
118 for (ip = *INOHASH(ump, inum); ip; ip = ip->i_next) {
119 if (inum == ip->i_number && dev == ip->i_dev)
122 if (ip == NULL || ITOV(ip) != vp) {
132 * Check to see if an inode is in the hash table. This is used to interlock
133 * file free operations to ensure that the vnode is not reused due to a
134 * reallocate of its inode number before we have had a chance to recycle it.
137 ufs_ihashcheck(struct ufsmount *ump, cdev_t dev, ino_t inum)
141 for (ip = *INOHASH(ump, inum); ip; ip = ip->i_next) {
142 if (inum == ip->i_number && dev == ip->i_dev)
149 * Insert the inode into the hash table, and return it locked.
152 ufs_ihashins(struct ufsmount *ump, struct inode *ip)
157 KKASSERT((ip->i_flag & IN_HASHED) == 0);
158 ipp = INOHASH(ump, ip->i_number);
159 while ((iq = *ipp) != NULL) {
160 if (ip->i_dev == iq->i_dev && ip->i_number == iq->i_number) {
167 ip->i_flag |= IN_HASHED;
172 * Remove the inode from the hash table.
175 ufs_ihashrem(struct ufsmount *ump, struct inode *ip)
180 if (ip->i_flag & IN_HASHED) {
181 ipp = INOHASH(ump, ip->i_number);
182 while ((iq = *ipp) != NULL) {
190 ip->i_flag &= ~IN_HASHED;