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5bb84bc84b
- Prefer '_' to ' ', as it results in more easily parsed results in memory monitoring tools such as vmstat. - Remove punctuation that is incompatible with using memory type names as file names, such as '/' characters. - Disambiguate some collisions by adding subsystem prefixes to some memory types. - Generally prefer lower case to upper case. - If the same type is defined in multiple architecture directories, attempt to use the same name in additional cases. Not all instances were caught in this change, so more work is required to finish this conversion. Similar changes are required for UMA zone names.
157 lines
4.2 KiB
C
157 lines
4.2 KiB
C
/*-
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* Copyright (c) 2005 Poul-Henning Kamp
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/vnode.h>
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static MALLOC_DEFINE(M_VFS_HASH, "vfs_hash", "VFS hash table");
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static LIST_HEAD(vfs_hash_head, vnode) *vfs_hash_tbl;
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static LIST_HEAD(,vnode) vfs_hash_side;
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static u_long vfs_hash_mask;
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static struct mtx vfs_hash_mtx;
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static void
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vfs_hashinit(void *dummy __unused)
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{
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vfs_hash_tbl = hashinit(desiredvnodes, M_VFS_HASH, &vfs_hash_mask);
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mtx_init(&vfs_hash_mtx, "vfs hash", NULL, MTX_DEF);
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LIST_INIT(&vfs_hash_side);
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}
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/* Must be SI_ORDER_SECOND so desiredvnodes is available */
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SYSINIT(vfs_hash, SI_SUB_VFS, SI_ORDER_SECOND, vfs_hashinit, NULL)
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static struct vfs_hash_head *
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vfs_hash_index(struct mount *mp, u_int hash)
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{
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return(&vfs_hash_tbl[(hash + mp->mnt_hashseed) & vfs_hash_mask]);
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}
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int
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vfs_hash_get(struct mount *mp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg)
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{
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struct vnode *vp;
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int error;
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while (1) {
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mtx_lock(&vfs_hash_mtx);
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LIST_FOREACH(vp, vfs_hash_index(mp, hash), v_hashlist) {
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if (vp->v_hash != hash)
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continue;
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if (vp->v_mount != mp)
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continue;
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if (fn != NULL && fn(vp, arg))
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continue;
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VI_LOCK(vp);
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mtx_unlock(&vfs_hash_mtx);
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error = vget(vp, flags | LK_INTERLOCK, td);
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if (error == ENOENT && (flags & LK_NOWAIT) == 0)
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break;
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if (error)
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return (error);
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*vpp = vp;
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return (0);
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}
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if (vp == NULL) {
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mtx_unlock(&vfs_hash_mtx);
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*vpp = NULL;
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return (0);
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}
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}
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}
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void
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vfs_hash_remove(struct vnode *vp)
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{
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mtx_lock(&vfs_hash_mtx);
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LIST_REMOVE(vp, v_hashlist);
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mtx_unlock(&vfs_hash_mtx);
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}
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int
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vfs_hash_insert(struct vnode *vp, u_int hash, int flags, struct thread *td, struct vnode **vpp, vfs_hash_cmp_t *fn, void *arg)
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{
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struct vnode *vp2;
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int error;
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lockmgr(vp->v_vnlock, flags & LK_TYPE_MASK, NULL, td);
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*vpp = NULL;
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while (1) {
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mtx_lock(&vfs_hash_mtx);
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LIST_FOREACH(vp2,
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vfs_hash_index(vp->v_mount, hash), v_hashlist) {
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if (vp2->v_hash != hash)
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continue;
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if (vp2->v_mount != vp->v_mount)
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continue;
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if (fn != NULL && fn(vp2, arg))
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continue;
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VI_LOCK(vp2);
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mtx_unlock(&vfs_hash_mtx);
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error = vget(vp2, flags | LK_INTERLOCK, td);
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if (error == ENOENT && (flags & LK_NOWAIT) == 0)
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break;
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mtx_lock(&vfs_hash_mtx);
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LIST_INSERT_HEAD(&vfs_hash_side, vp, v_hashlist);
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mtx_unlock(&vfs_hash_mtx);
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vput(vp);
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if (!error)
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*vpp = vp2;
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return (error);
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}
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if (vp2 == NULL)
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break;
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}
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vp->v_hash = hash;
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LIST_INSERT_HEAD(vfs_hash_index(vp->v_mount, hash), vp, v_hashlist);
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mtx_unlock(&vfs_hash_mtx);
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return (0);
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}
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void
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vfs_hash_rehash(struct vnode *vp, u_int hash)
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{
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mtx_lock(&vfs_hash_mtx);
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LIST_REMOVE(vp, v_hashlist);
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LIST_INSERT_HEAD(vfs_hash_index(vp->v_mount, hash), vp, v_hashlist);
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vp->v_hash = hash;
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mtx_unlock(&vfs_hash_mtx);
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}
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