- Fix for possible unset uid/gid in toproto - Fix for default mtree style - Update libelf - Importing libexecinfo - Resynchronize GCC, mpc, gmp, mpfr - build.sh: Replace params with show-params. This has been done as the make target has been renamed in the same way, while a new target named params has been added. This new target generates a file containing all the parameters, instead of printing it on the console. - Update test48 with new etc/services (Fix by Ben Gras <ben@minix3.org) get getservbyport() out of the inner loop Change-Id: Ie6ad5226fa2621ff9f0dee8782ea48f9443d2091
1171 lines
33 KiB
C
1171 lines
33 KiB
C
/* $NetBSD: ulfs_dirhash.c,v 1.7 2013/07/28 01:10:49 dholland Exp $ */
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/* from NetBSD: ufs_dirhash.c,v 1.34 2009/10/05 23:48:08 rmind Exp */
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/*
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* Copyright (c) 2001, 2002 Ian Dowse. 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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* $FreeBSD: src/sys/ufs/ufs/ufs_dirhash.c,v 1.3.2.8 2004/12/08 11:54:13 dwmalone Exp $
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*/
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#include <sys/cdefs.h>
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__KERNEL_RCSID(0, "$NetBSD: ulfs_dirhash.c,v 1.7 2013/07/28 01:10:49 dholland Exp $");
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/*
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* This implements a hash-based lookup scheme for ULFS directories.
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*/
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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/kmem.h>
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#include <sys/types.h>
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#include <sys/hash.h>
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#include <sys/proc.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/mount.h>
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#include <sys/pool.h>
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#include <sys/sysctl.h>
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#include <sys/atomic.h>
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#include <ufs/lfs/ulfs_inode.h>
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#include <ufs/lfs/ulfs_dirhash.h>
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#include <ufs/lfs/ulfsmount.h>
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#include <ufs/lfs/ulfs_bswap.h>
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#include <ufs/lfs/ulfs_extern.h>
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#define WRAPINCR(val, limit) (((val) + 1 == (limit)) ? 0 : ((val) + 1))
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#define WRAPDECR(val, limit) (((val) == 0) ? ((limit) - 1) : ((val) - 1))
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#define OFSFMT(ip) ((ip)->i_lfs->um_maxsymlinklen <= 0)
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#define BLKFREE2IDX(n) ((n) > DH_NFSTATS ? DH_NFSTATS : (n))
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static u_int ulfs_dirhashminblks = 5;
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static u_int ulfs_dirhashmaxmem = 2 * 1024 * 1024;
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static u_int ulfs_dirhashmem;
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static u_int ulfs_dirhashcheck = 0;
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static int ulfsdirhash_hash(struct dirhash *dh, const char *name, int namelen);
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static void ulfsdirhash_adjfree(struct dirhash *dh, doff_t offset, int diff,
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int dirblksiz);
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static void ulfsdirhash_delslot(struct dirhash *dh, int slot);
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static int ulfsdirhash_findslot(struct dirhash *dh, const char *name,
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int namelen, doff_t offset);
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static doff_t ulfsdirhash_getprev(struct lfs_direct *dp, doff_t offset,
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int dirblksiz);
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static int ulfsdirhash_recycle(int wanted);
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static pool_cache_t ulfsdirhashblk_cache;
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static pool_cache_t ulfsdirhash_cache;
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#define DIRHASHLIST_LOCK() mutex_enter(&ulfsdirhash_lock)
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#define DIRHASHLIST_UNLOCK() mutex_exit(&ulfsdirhash_lock)
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#define DIRHASH_LOCK(dh) mutex_enter(&(dh)->dh_lock)
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#define DIRHASH_UNLOCK(dh) mutex_exit(&(dh)->dh_lock)
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#define DIRHASH_BLKALLOC() \
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pool_cache_get(ulfsdirhashblk_cache, PR_NOWAIT)
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#define DIRHASH_BLKFREE(ptr) \
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pool_cache_put(ulfsdirhashblk_cache, ptr)
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/* Dirhash list; recently-used entries are near the tail. */
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static TAILQ_HEAD(, dirhash) ulfsdirhash_list;
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/* Protects: ulfsdirhash_list, `dh_list' field, ulfs_dirhashmem. */
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static kmutex_t ulfsdirhash_lock;
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static struct sysctllog *ulfsdirhash_sysctl_log;
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/*
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* Locking order:
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* ulfsdirhash_lock
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* dh_lock
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*
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* The dh_lock mutex should be acquired either via the inode lock, or via
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* ulfsdirhash_lock. Only the owner of the inode may free the associated
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* dirhash, but anything can steal its memory and set dh_hash to NULL.
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*/
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/*
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* Attempt to build up a hash table for the directory contents in
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* inode 'ip'. Returns 0 on success, or -1 of the operation failed.
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*/
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int
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ulfsdirhash_build(struct inode *ip)
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{
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struct dirhash *dh;
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struct buf *bp = NULL;
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struct lfs_direct *ep;
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struct vnode *vp;
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doff_t bmask, pos;
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int dirblocks, i, j, memreqd, nblocks, narrays, nslots, slot;
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const int needswap = ULFS_IPNEEDSWAP(ip);
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int dirblksiz = ip->i_lfs->um_dirblksiz;
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/* Check if we can/should use dirhash. */
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if (ip->i_dirhash == NULL) {
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if (ip->i_size < (ulfs_dirhashminblks * dirblksiz) || OFSFMT(ip))
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return (-1);
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} else {
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/* Hash exists, but sysctls could have changed. */
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if (ip->i_size < (ulfs_dirhashminblks * dirblksiz) ||
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ulfs_dirhashmem > ulfs_dirhashmaxmem) {
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ulfsdirhash_free(ip);
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return (-1);
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}
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/* Check if hash exists and is intact (note: unlocked read). */
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if (ip->i_dirhash->dh_hash != NULL)
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return (0);
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/* Free the old, recycled hash and build a new one. */
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ulfsdirhash_free(ip);
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}
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/* Don't hash removed directories. */
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if (ip->i_nlink == 0)
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return (-1);
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vp = ip->i_vnode;
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/* Allocate 50% more entries than this dir size could ever need. */
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KASSERT(ip->i_size >= dirblksiz);
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nslots = ip->i_size / LFS_DIRECTSIZ(1);
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nslots = (nslots * 3 + 1) / 2;
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narrays = howmany(nslots, DH_NBLKOFF);
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nslots = narrays * DH_NBLKOFF;
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dirblocks = howmany(ip->i_size, dirblksiz);
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nblocks = (dirblocks * 3 + 1) / 2;
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memreqd = sizeof(*dh) + narrays * sizeof(*dh->dh_hash) +
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narrays * DH_NBLKOFF * sizeof(**dh->dh_hash) +
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nblocks * sizeof(*dh->dh_blkfree);
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while (atomic_add_int_nv(&ulfs_dirhashmem, memreqd) >
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ulfs_dirhashmaxmem) {
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atomic_add_int(&ulfs_dirhashmem, -memreqd);
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if (memreqd > ulfs_dirhashmaxmem / 2)
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return (-1);
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/* Try to free some space. */
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if (ulfsdirhash_recycle(memreqd) != 0)
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return (-1);
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else
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DIRHASHLIST_UNLOCK();
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}
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/*
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* Use non-blocking mallocs so that we will revert to a linear
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* lookup on failure rather than potentially blocking forever.
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*/
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dh = pool_cache_get(ulfsdirhash_cache, PR_NOWAIT);
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if (dh == NULL) {
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atomic_add_int(&ulfs_dirhashmem, -memreqd);
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return (-1);
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}
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memset(dh, 0, sizeof(*dh));
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mutex_init(&dh->dh_lock, MUTEX_DEFAULT, IPL_NONE);
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DIRHASH_LOCK(dh);
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dh->dh_hashsz = narrays * sizeof(dh->dh_hash[0]);
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dh->dh_hash = kmem_zalloc(dh->dh_hashsz, KM_NOSLEEP);
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dh->dh_blkfreesz = nblocks * sizeof(dh->dh_blkfree[0]);
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dh->dh_blkfree = kmem_zalloc(dh->dh_blkfreesz, KM_NOSLEEP);
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if (dh->dh_hash == NULL || dh->dh_blkfree == NULL)
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goto fail;
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for (i = 0; i < narrays; i++) {
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if ((dh->dh_hash[i] = DIRHASH_BLKALLOC()) == NULL)
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goto fail;
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for (j = 0; j < DH_NBLKOFF; j++)
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dh->dh_hash[i][j] = DIRHASH_EMPTY;
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}
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/* Initialise the hash table and block statistics. */
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dh->dh_narrays = narrays;
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dh->dh_hlen = nslots;
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dh->dh_nblk = nblocks;
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dh->dh_dirblks = dirblocks;
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for (i = 0; i < dirblocks; i++)
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dh->dh_blkfree[i] = dirblksiz / DIRALIGN;
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for (i = 0; i < DH_NFSTATS; i++)
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dh->dh_firstfree[i] = -1;
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dh->dh_firstfree[DH_NFSTATS] = 0;
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dh->dh_seqopt = 0;
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dh->dh_seqoff = 0;
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dh->dh_score = DH_SCOREINIT;
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ip->i_dirhash = dh;
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bmask = VFSTOULFS(vp->v_mount)->um_mountp->mnt_stat.f_iosize - 1;
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pos = 0;
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while (pos < ip->i_size) {
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if ((curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD)
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!= 0) {
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preempt();
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}
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/* If necessary, get the next directory block. */
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if ((pos & bmask) == 0) {
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if (bp != NULL)
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brelse(bp, 0);
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if (ulfs_blkatoff(vp, (off_t)pos, NULL, &bp, false) != 0)
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goto fail;
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}
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/* Add this entry to the hash. */
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ep = (struct lfs_direct *)((char *)bp->b_data + (pos & bmask));
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if (ep->d_reclen == 0 || ep->d_reclen >
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dirblksiz - (pos & (dirblksiz - 1))) {
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/* Corrupted directory. */
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brelse(bp, 0);
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goto fail;
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}
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if (ep->d_ino != 0) {
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/* Add the entry (simplified ulfsdirhash_add). */
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slot = ulfsdirhash_hash(dh, ep->d_name, ep->d_namlen);
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while (DH_ENTRY(dh, slot) != DIRHASH_EMPTY)
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slot = WRAPINCR(slot, dh->dh_hlen);
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dh->dh_hused++;
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DH_ENTRY(dh, slot) = pos;
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ulfsdirhash_adjfree(dh, pos, -LFS_DIRSIZ(0, ep, needswap),
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dirblksiz);
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}
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pos += ep->d_reclen;
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}
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if (bp != NULL)
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brelse(bp, 0);
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DIRHASHLIST_LOCK();
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TAILQ_INSERT_TAIL(&ulfsdirhash_list, dh, dh_list);
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dh->dh_onlist = 1;
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DIRHASH_UNLOCK(dh);
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DIRHASHLIST_UNLOCK();
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return (0);
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fail:
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DIRHASH_UNLOCK(dh);
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if (dh->dh_hash != NULL) {
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for (i = 0; i < narrays; i++)
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if (dh->dh_hash[i] != NULL)
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DIRHASH_BLKFREE(dh->dh_hash[i]);
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kmem_free(dh->dh_hash, dh->dh_hashsz);
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}
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if (dh->dh_blkfree != NULL)
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kmem_free(dh->dh_blkfree, dh->dh_blkfreesz);
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mutex_destroy(&dh->dh_lock);
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pool_cache_put(ulfsdirhash_cache, dh);
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ip->i_dirhash = NULL;
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atomic_add_int(&ulfs_dirhashmem, -memreqd);
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return (-1);
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}
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/*
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* Free any hash table associated with inode 'ip'.
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*/
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void
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ulfsdirhash_free(struct inode *ip)
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{
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struct dirhash *dh;
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int i, mem;
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if ((dh = ip->i_dirhash) == NULL)
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return;
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if (dh->dh_onlist) {
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DIRHASHLIST_LOCK();
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if (dh->dh_onlist)
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TAILQ_REMOVE(&ulfsdirhash_list, dh, dh_list);
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DIRHASHLIST_UNLOCK();
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}
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/* The dirhash pointed to by 'dh' is exclusively ours now. */
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mem = sizeof(*dh);
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if (dh->dh_hash != NULL) {
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for (i = 0; i < dh->dh_narrays; i++)
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DIRHASH_BLKFREE(dh->dh_hash[i]);
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kmem_free(dh->dh_hash, dh->dh_hashsz);
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kmem_free(dh->dh_blkfree, dh->dh_blkfreesz);
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mem += dh->dh_hashsz;
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mem += dh->dh_narrays * DH_NBLKOFF * sizeof(**dh->dh_hash);
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mem += dh->dh_nblk * sizeof(*dh->dh_blkfree);
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}
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mutex_destroy(&dh->dh_lock);
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pool_cache_put(ulfsdirhash_cache, dh);
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ip->i_dirhash = NULL;
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atomic_add_int(&ulfs_dirhashmem, -mem);
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}
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/*
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* Find the offset of the specified name within the given inode.
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* Returns 0 on success, ENOENT if the entry does not exist, or
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* EJUSTRETURN if the caller should revert to a linear search.
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*
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* If successful, the directory offset is stored in *offp, and a
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* pointer to a struct buf containing the entry is stored in *bpp. If
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* prevoffp is non-NULL, the offset of the previous entry within
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* the DIRBLKSIZ-sized block is stored in *prevoffp (if the entry
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* is the first in a block, the start of the block is used).
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*/
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int
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ulfsdirhash_lookup(struct inode *ip, const char *name, int namelen, doff_t *offp,
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struct buf **bpp, doff_t *prevoffp)
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{
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struct dirhash *dh, *dh_next;
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struct lfs_direct *dp;
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struct vnode *vp;
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struct buf *bp;
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doff_t blkoff, bmask, offset, prevoff;
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int i, slot;
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const int needswap = ULFS_IPNEEDSWAP(ip);
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int dirblksiz = ip->i_lfs->um_dirblksiz;
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if ((dh = ip->i_dirhash) == NULL)
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return (EJUSTRETURN);
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/*
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* Move this dirhash towards the end of the list if it has a
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* score higher than the next entry, and acquire the dh_lock.
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* Optimise the case where it's already the last by performing
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* an unlocked read of the TAILQ_NEXT pointer.
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*
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* In both cases, end up holding just dh_lock.
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*/
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if (TAILQ_NEXT(dh, dh_list) != NULL) {
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DIRHASHLIST_LOCK();
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DIRHASH_LOCK(dh);
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/*
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* If the new score will be greater than that of the next
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* entry, then move this entry past it. With both mutexes
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* held, dh_next won't go away, but its dh_score could
|
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* change; that's not important since it is just a hint.
|
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*/
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if (dh->dh_hash != NULL &&
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(dh_next = TAILQ_NEXT(dh, dh_list)) != NULL &&
|
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dh->dh_score >= dh_next->dh_score) {
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KASSERT(dh->dh_onlist);
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TAILQ_REMOVE(&ulfsdirhash_list, dh, dh_list);
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TAILQ_INSERT_AFTER(&ulfsdirhash_list, dh_next, dh,
|
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dh_list);
|
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}
|
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DIRHASHLIST_UNLOCK();
|
|
} else {
|
|
/* Already the last, though that could change as we wait. */
|
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DIRHASH_LOCK(dh);
|
|
}
|
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if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return (EJUSTRETURN);
|
|
}
|
|
|
|
/* Update the score. */
|
|
if (dh->dh_score < DH_SCOREMAX)
|
|
dh->dh_score++;
|
|
|
|
vp = ip->i_vnode;
|
|
bmask = VFSTOULFS(vp->v_mount)->um_mountp->mnt_stat.f_iosize - 1;
|
|
blkoff = -1;
|
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bp = NULL;
|
|
restart:
|
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slot = ulfsdirhash_hash(dh, name, namelen);
|
|
|
|
if (dh->dh_seqopt) {
|
|
/*
|
|
* Sequential access optimisation. dh_seqoff contains the
|
|
* offset of the directory entry immediately following
|
|
* the last entry that was looked up. Check if this offset
|
|
* appears in the hash chain for the name we are looking for.
|
|
*/
|
|
for (i = slot; (offset = DH_ENTRY(dh, i)) != DIRHASH_EMPTY;
|
|
i = WRAPINCR(i, dh->dh_hlen))
|
|
if (offset == dh->dh_seqoff)
|
|
break;
|
|
if (offset == dh->dh_seqoff) {
|
|
/*
|
|
* We found an entry with the expected offset. This
|
|
* is probably the entry we want, but if not, the
|
|
* code below will turn off seqoff and retry.
|
|
*/
|
|
slot = i;
|
|
} else
|
|
dh->dh_seqopt = 0;
|
|
}
|
|
|
|
for (; (offset = DH_ENTRY(dh, slot)) != DIRHASH_EMPTY;
|
|
slot = WRAPINCR(slot, dh->dh_hlen)) {
|
|
if (offset == DIRHASH_DEL)
|
|
continue;
|
|
|
|
if (offset < 0 || offset >= ip->i_size)
|
|
panic("ulfsdirhash_lookup: bad offset in hash array");
|
|
if ((offset & ~bmask) != blkoff) {
|
|
if (bp != NULL)
|
|
brelse(bp, 0);
|
|
blkoff = offset & ~bmask;
|
|
if (ulfs_blkatoff(vp, (off_t)blkoff,
|
|
NULL, &bp, false) != 0) {
|
|
DIRHASH_UNLOCK(dh);
|
|
return (EJUSTRETURN);
|
|
}
|
|
}
|
|
dp = (struct lfs_direct *)((char *)bp->b_data + (offset & bmask));
|
|
if (dp->d_reclen == 0 || dp->d_reclen >
|
|
dirblksiz - (offset & (dirblksiz - 1))) {
|
|
/* Corrupted directory. */
|
|
DIRHASH_UNLOCK(dh);
|
|
brelse(bp, 0);
|
|
return (EJUSTRETURN);
|
|
}
|
|
if (dp->d_namlen == namelen &&
|
|
memcmp(dp->d_name, name, namelen) == 0) {
|
|
/* Found. Get the prev offset if needed. */
|
|
if (prevoffp != NULL) {
|
|
if (offset & (dirblksiz - 1)) {
|
|
prevoff = ulfsdirhash_getprev(dp,
|
|
offset, dirblksiz);
|
|
if (prevoff == -1) {
|
|
brelse(bp, 0);
|
|
return (EJUSTRETURN);
|
|
}
|
|
} else
|
|
prevoff = offset;
|
|
*prevoffp = prevoff;
|
|
}
|
|
|
|
/* Check for sequential access, and update offset. */
|
|
if (dh->dh_seqopt == 0 && dh->dh_seqoff == offset)
|
|
dh->dh_seqopt = 1;
|
|
dh->dh_seqoff = offset + LFS_DIRSIZ(0, dp, needswap);
|
|
DIRHASH_UNLOCK(dh);
|
|
|
|
*bpp = bp;
|
|
*offp = offset;
|
|
return (0);
|
|
}
|
|
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
if (bp != NULL)
|
|
brelse(bp, 0);
|
|
ulfsdirhash_free(ip);
|
|
return (EJUSTRETURN);
|
|
}
|
|
/*
|
|
* When the name doesn't match in the seqopt case, go back
|
|
* and search normally.
|
|
*/
|
|
if (dh->dh_seqopt) {
|
|
dh->dh_seqopt = 0;
|
|
goto restart;
|
|
}
|
|
}
|
|
DIRHASH_UNLOCK(dh);
|
|
if (bp != NULL)
|
|
brelse(bp, 0);
|
|
return (ENOENT);
|
|
}
|
|
|
|
/*
|
|
* Find a directory block with room for 'slotneeded' bytes. Returns
|
|
* the offset of the directory entry that begins the free space.
|
|
* This will either be the offset of an existing entry that has free
|
|
* space at the end, or the offset of an entry with d_ino == 0 at
|
|
* the start of a DIRBLKSIZ block.
|
|
*
|
|
* To use the space, the caller may need to compact existing entries in
|
|
* the directory. The total number of bytes in all of the entries involved
|
|
* in the compaction is stored in *slotsize. In other words, all of
|
|
* the entries that must be compacted are exactly contained in the
|
|
* region beginning at the returned offset and spanning *slotsize bytes.
|
|
*
|
|
* Returns -1 if no space was found, indicating that the directory
|
|
* must be extended.
|
|
*/
|
|
doff_t
|
|
ulfsdirhash_findfree(struct inode *ip, int slotneeded, int *slotsize)
|
|
{
|
|
struct lfs_direct *dp;
|
|
struct dirhash *dh;
|
|
struct buf *bp;
|
|
doff_t pos, slotstart;
|
|
int dirblock, error, freebytes, i;
|
|
const int needswap = ULFS_IPNEEDSWAP(ip);
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return (-1);
|
|
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return (-1);
|
|
}
|
|
|
|
/* Find a directory block with the desired free space. */
|
|
dirblock = -1;
|
|
for (i = howmany(slotneeded, DIRALIGN); i <= DH_NFSTATS; i++)
|
|
if ((dirblock = dh->dh_firstfree[i]) != -1)
|
|
break;
|
|
if (dirblock == -1) {
|
|
DIRHASH_UNLOCK(dh);
|
|
return (-1);
|
|
}
|
|
|
|
KASSERT(dirblock < dh->dh_nblk &&
|
|
dh->dh_blkfree[dirblock] >= howmany(slotneeded, DIRALIGN));
|
|
pos = dirblock * dirblksiz;
|
|
error = ulfs_blkatoff(ip->i_vnode, (off_t)pos, (void *)&dp, &bp, false);
|
|
if (error) {
|
|
DIRHASH_UNLOCK(dh);
|
|
return (-1);
|
|
}
|
|
/* Find the first entry with free space. */
|
|
for (i = 0; i < dirblksiz; ) {
|
|
if (dp->d_reclen == 0) {
|
|
DIRHASH_UNLOCK(dh);
|
|
brelse(bp, 0);
|
|
return (-1);
|
|
}
|
|
if (dp->d_ino == 0 || dp->d_reclen > LFS_DIRSIZ(0, dp, needswap))
|
|
break;
|
|
i += dp->d_reclen;
|
|
dp = (struct lfs_direct *)((char *)dp + dp->d_reclen);
|
|
}
|
|
if (i > dirblksiz) {
|
|
DIRHASH_UNLOCK(dh);
|
|
brelse(bp, 0);
|
|
return (-1);
|
|
}
|
|
slotstart = pos + i;
|
|
|
|
/* Find the range of entries needed to get enough space */
|
|
freebytes = 0;
|
|
while (i < dirblksiz && freebytes < slotneeded) {
|
|
freebytes += dp->d_reclen;
|
|
if (dp->d_ino != 0)
|
|
freebytes -= LFS_DIRSIZ(0, dp, needswap);
|
|
if (dp->d_reclen == 0) {
|
|
DIRHASH_UNLOCK(dh);
|
|
brelse(bp, 0);
|
|
return (-1);
|
|
}
|
|
i += dp->d_reclen;
|
|
dp = (struct lfs_direct *)((char *)dp + dp->d_reclen);
|
|
}
|
|
if (i > dirblksiz) {
|
|
DIRHASH_UNLOCK(dh);
|
|
brelse(bp, 0);
|
|
return (-1);
|
|
}
|
|
if (freebytes < slotneeded)
|
|
panic("ulfsdirhash_findfree: free mismatch");
|
|
DIRHASH_UNLOCK(dh);
|
|
brelse(bp, 0);
|
|
*slotsize = pos + i - slotstart;
|
|
return (slotstart);
|
|
}
|
|
|
|
/*
|
|
* Return the start of the unused space at the end of a directory, or
|
|
* -1 if there are no trailing unused blocks.
|
|
*/
|
|
doff_t
|
|
ulfsdirhash_enduseful(struct inode *ip)
|
|
{
|
|
struct dirhash *dh;
|
|
int i;
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return (-1);
|
|
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return (-1);
|
|
}
|
|
|
|
if (dh->dh_blkfree[dh->dh_dirblks - 1] != dirblksiz / DIRALIGN) {
|
|
DIRHASH_UNLOCK(dh);
|
|
return (-1);
|
|
}
|
|
|
|
for (i = dh->dh_dirblks - 1; i >= 0; i--)
|
|
if (dh->dh_blkfree[i] != dirblksiz / DIRALIGN)
|
|
break;
|
|
DIRHASH_UNLOCK(dh);
|
|
return ((doff_t)(i + 1) * dirblksiz);
|
|
}
|
|
|
|
/*
|
|
* Insert information into the hash about a new directory entry. dirp
|
|
* points to a struct lfs_direct containing the entry, and offset specifies
|
|
* the offset of this entry.
|
|
*/
|
|
void
|
|
ulfsdirhash_add(struct inode *ip, struct lfs_direct *dirp, doff_t offset)
|
|
{
|
|
struct dirhash *dh;
|
|
int slot;
|
|
const int needswap = ULFS_IPNEEDSWAP(ip);
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return;
|
|
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
KASSERT(offset < dh->dh_dirblks * dirblksiz);
|
|
/*
|
|
* Normal hash usage is < 66%. If the usage gets too high then
|
|
* remove the hash entirely and let it be rebuilt later.
|
|
*/
|
|
if (dh->dh_hused >= (dh->dh_hlen * 3) / 4) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
/* Find a free hash slot (empty or deleted), and add the entry. */
|
|
slot = ulfsdirhash_hash(dh, dirp->d_name, dirp->d_namlen);
|
|
while (DH_ENTRY(dh, slot) >= 0)
|
|
slot = WRAPINCR(slot, dh->dh_hlen);
|
|
if (DH_ENTRY(dh, slot) == DIRHASH_EMPTY)
|
|
dh->dh_hused++;
|
|
DH_ENTRY(dh, slot) = offset;
|
|
|
|
/* Update the per-block summary info. */
|
|
ulfsdirhash_adjfree(dh, offset, -LFS_DIRSIZ(0, dirp, needswap), dirblksiz);
|
|
DIRHASH_UNLOCK(dh);
|
|
}
|
|
|
|
/*
|
|
* Remove the specified directory entry from the hash. The entry to remove
|
|
* is defined by the name in `dirp', which must exist at the specified
|
|
* `offset' within the directory.
|
|
*/
|
|
void
|
|
ulfsdirhash_remove(struct inode *ip, struct lfs_direct *dirp, doff_t offset)
|
|
{
|
|
struct dirhash *dh;
|
|
int slot;
|
|
const int needswap = ULFS_IPNEEDSWAP(ip);
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return;
|
|
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
KASSERT(offset < dh->dh_dirblks * dirblksiz);
|
|
/* Find the entry */
|
|
slot = ulfsdirhash_findslot(dh, dirp->d_name, dirp->d_namlen, offset);
|
|
|
|
/* Remove the hash entry. */
|
|
ulfsdirhash_delslot(dh, slot);
|
|
|
|
/* Update the per-block summary info. */
|
|
ulfsdirhash_adjfree(dh, offset, LFS_DIRSIZ(0, dirp, needswap), dirblksiz);
|
|
DIRHASH_UNLOCK(dh);
|
|
}
|
|
|
|
/*
|
|
* Change the offset associated with a directory entry in the hash. Used
|
|
* when compacting directory blocks.
|
|
*/
|
|
void
|
|
ulfsdirhash_move(struct inode *ip, struct lfs_direct *dirp, doff_t oldoff,
|
|
doff_t newoff)
|
|
{
|
|
struct dirhash *dh;
|
|
int slot;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return;
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
KASSERT(oldoff < dh->dh_dirblks * ip->i_lfs->um_dirblksiz &&
|
|
newoff < dh->dh_dirblks * ip->i_lfs->um_dirblksiz);
|
|
/* Find the entry, and update the offset. */
|
|
slot = ulfsdirhash_findslot(dh, dirp->d_name, dirp->d_namlen, oldoff);
|
|
DH_ENTRY(dh, slot) = newoff;
|
|
DIRHASH_UNLOCK(dh);
|
|
}
|
|
|
|
/*
|
|
* Inform dirhash that the directory has grown by one block that
|
|
* begins at offset (i.e. the new length is offset + DIRBLKSIZ).
|
|
*/
|
|
void
|
|
ulfsdirhash_newblk(struct inode *ip, doff_t offset)
|
|
{
|
|
struct dirhash *dh;
|
|
int block;
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return;
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
KASSERT(offset == dh->dh_dirblks * dirblksiz);
|
|
block = offset / dirblksiz;
|
|
if (block >= dh->dh_nblk) {
|
|
/* Out of space; must rebuild. */
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
dh->dh_dirblks = block + 1;
|
|
|
|
/* Account for the new free block. */
|
|
dh->dh_blkfree[block] = dirblksiz / DIRALIGN;
|
|
if (dh->dh_firstfree[DH_NFSTATS] == -1)
|
|
dh->dh_firstfree[DH_NFSTATS] = block;
|
|
DIRHASH_UNLOCK(dh);
|
|
}
|
|
|
|
/*
|
|
* Inform dirhash that the directory is being truncated.
|
|
*/
|
|
void
|
|
ulfsdirhash_dirtrunc(struct inode *ip, doff_t offset)
|
|
{
|
|
struct dirhash *dh;
|
|
int block, i;
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return;
|
|
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
KASSERT(offset <= dh->dh_dirblks * dirblksiz);
|
|
block = howmany(offset, dirblksiz);
|
|
/*
|
|
* If the directory shrinks to less than 1/8 of dh_nblk blocks
|
|
* (about 20% of its original size due to the 50% extra added in
|
|
* ulfsdirhash_build) then free it, and let the caller rebuild
|
|
* if necessary.
|
|
*/
|
|
if (block < dh->dh_nblk / 8 && dh->dh_narrays > 1) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Remove any `first free' information pertaining to the
|
|
* truncated blocks. All blocks we're removing should be
|
|
* completely unused.
|
|
*/
|
|
if (dh->dh_firstfree[DH_NFSTATS] >= block)
|
|
dh->dh_firstfree[DH_NFSTATS] = -1;
|
|
for (i = block; i < dh->dh_dirblks; i++)
|
|
if (dh->dh_blkfree[i] != dirblksiz / DIRALIGN)
|
|
panic("ulfsdirhash_dirtrunc: blocks in use");
|
|
for (i = 0; i < DH_NFSTATS; i++)
|
|
if (dh->dh_firstfree[i] >= block)
|
|
panic("ulfsdirhash_dirtrunc: first free corrupt");
|
|
dh->dh_dirblks = block;
|
|
DIRHASH_UNLOCK(dh);
|
|
}
|
|
|
|
/*
|
|
* Debugging function to check that the dirhash information about
|
|
* a directory block matches its actual contents. Panics if a mismatch
|
|
* is detected.
|
|
*
|
|
* On entry, `sbuf' should point to the start of an in-core
|
|
* DIRBLKSIZ-sized directory block, and `offset' should contain the
|
|
* offset from the start of the directory of that block.
|
|
*/
|
|
void
|
|
ulfsdirhash_checkblock(struct inode *ip, char *sbuf, doff_t offset)
|
|
{
|
|
struct dirhash *dh;
|
|
struct lfs_direct *dp;
|
|
int block, ffslot, i, nfree;
|
|
const int needswap = ULFS_IPNEEDSWAP(ip);
|
|
int dirblksiz = ip->i_lfs->um_dirblksiz;
|
|
|
|
if (!ulfs_dirhashcheck)
|
|
return;
|
|
if ((dh = ip->i_dirhash) == NULL)
|
|
return;
|
|
|
|
DIRHASH_LOCK(dh);
|
|
if (dh->dh_hash == NULL) {
|
|
DIRHASH_UNLOCK(dh);
|
|
ulfsdirhash_free(ip);
|
|
return;
|
|
}
|
|
|
|
block = offset / dirblksiz;
|
|
if ((offset & (dirblksiz - 1)) != 0 || block >= dh->dh_dirblks)
|
|
panic("ulfsdirhash_checkblock: bad offset");
|
|
|
|
nfree = 0;
|
|
for (i = 0; i < dirblksiz; i += dp->d_reclen) {
|
|
dp = (struct lfs_direct *)(sbuf + i);
|
|
if (dp->d_reclen == 0 || i + dp->d_reclen > dirblksiz)
|
|
panic("ulfsdirhash_checkblock: bad dir");
|
|
|
|
if (dp->d_ino == 0) {
|
|
#if 0
|
|
/*
|
|
* XXX entries with d_ino == 0 should only occur
|
|
* at the start of a DIRBLKSIZ block. However the
|
|
* ulfs code is tolerant of such entries at other
|
|
* offsets, and fsck does not fix them.
|
|
*/
|
|
if (i != 0)
|
|
panic("ulfsdirhash_checkblock: bad dir inode");
|
|
#endif
|
|
nfree += dp->d_reclen;
|
|
continue;
|
|
}
|
|
|
|
/* Check that the entry exists (will panic if it doesn't). */
|
|
ulfsdirhash_findslot(dh, dp->d_name, dp->d_namlen, offset + i);
|
|
|
|
nfree += dp->d_reclen - LFS_DIRSIZ(0, dp, needswap);
|
|
}
|
|
if (i != dirblksiz)
|
|
panic("ulfsdirhash_checkblock: bad dir end");
|
|
|
|
if (dh->dh_blkfree[block] * DIRALIGN != nfree)
|
|
panic("ulfsdirhash_checkblock: bad free count");
|
|
|
|
ffslot = BLKFREE2IDX(nfree / DIRALIGN);
|
|
for (i = 0; i <= DH_NFSTATS; i++)
|
|
if (dh->dh_firstfree[i] == block && i != ffslot)
|
|
panic("ulfsdirhash_checkblock: bad first-free");
|
|
if (dh->dh_firstfree[ffslot] == -1)
|
|
panic("ulfsdirhash_checkblock: missing first-free entry");
|
|
DIRHASH_UNLOCK(dh);
|
|
}
|
|
|
|
/*
|
|
* Hash the specified filename into a dirhash slot.
|
|
*/
|
|
static int
|
|
ulfsdirhash_hash(struct dirhash *dh, const char *name, int namelen)
|
|
{
|
|
u_int32_t hash;
|
|
|
|
/*
|
|
* We hash the name and then some other bit of data that is
|
|
* invariant over the dirhash's lifetime. Otherwise names
|
|
* differing only in the last byte are placed close to one
|
|
* another in the table, which is bad for linear probing.
|
|
*/
|
|
hash = hash32_buf(name, namelen, HASH32_BUF_INIT);
|
|
hash = hash32_buf(&dh, sizeof(dh), hash);
|
|
return (hash % dh->dh_hlen);
|
|
}
|
|
|
|
/*
|
|
* Adjust the number of free bytes in the block containing `offset'
|
|
* by the value specified by `diff'.
|
|
*
|
|
* The caller must ensure we have exclusive access to `dh'; normally
|
|
* that means that dh_lock should be held, but this is also called
|
|
* from ulfsdirhash_build() where exclusive access can be assumed.
|
|
*/
|
|
static void
|
|
ulfsdirhash_adjfree(struct dirhash *dh, doff_t offset, int diff, int dirblksiz)
|
|
{
|
|
int block, i, nfidx, ofidx;
|
|
|
|
KASSERT(mutex_owned(&dh->dh_lock));
|
|
|
|
/* Update the per-block summary info. */
|
|
block = offset / dirblksiz;
|
|
KASSERT(block < dh->dh_nblk && block < dh->dh_dirblks);
|
|
ofidx = BLKFREE2IDX(dh->dh_blkfree[block]);
|
|
dh->dh_blkfree[block] = (int)dh->dh_blkfree[block] + (diff / DIRALIGN);
|
|
nfidx = BLKFREE2IDX(dh->dh_blkfree[block]);
|
|
|
|
/* Update the `first free' list if necessary. */
|
|
if (ofidx != nfidx) {
|
|
/* If removing, scan forward for the next block. */
|
|
if (dh->dh_firstfree[ofidx] == block) {
|
|
for (i = block + 1; i < dh->dh_dirblks; i++)
|
|
if (BLKFREE2IDX(dh->dh_blkfree[i]) == ofidx)
|
|
break;
|
|
dh->dh_firstfree[ofidx] = (i < dh->dh_dirblks) ? i : -1;
|
|
}
|
|
|
|
/* Make this the new `first free' if necessary */
|
|
if (dh->dh_firstfree[nfidx] > block ||
|
|
dh->dh_firstfree[nfidx] == -1)
|
|
dh->dh_firstfree[nfidx] = block;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find the specified name which should have the specified offset.
|
|
* Returns a slot number, and panics on failure.
|
|
*
|
|
* `dh' must be locked on entry and remains so on return.
|
|
*/
|
|
static int
|
|
ulfsdirhash_findslot(struct dirhash *dh, const char *name, int namelen,
|
|
doff_t offset)
|
|
{
|
|
int slot;
|
|
|
|
KASSERT(mutex_owned(&dh->dh_lock));
|
|
|
|
/* Find the entry. */
|
|
KASSERT(dh->dh_hused < dh->dh_hlen);
|
|
slot = ulfsdirhash_hash(dh, name, namelen);
|
|
while (DH_ENTRY(dh, slot) != offset &&
|
|
DH_ENTRY(dh, slot) != DIRHASH_EMPTY)
|
|
slot = WRAPINCR(slot, dh->dh_hlen);
|
|
if (DH_ENTRY(dh, slot) != offset)
|
|
panic("ulfsdirhash_findslot: '%.*s' not found", namelen, name);
|
|
|
|
return (slot);
|
|
}
|
|
|
|
/*
|
|
* Remove the entry corresponding to the specified slot from the hash array.
|
|
*
|
|
* `dh' must be locked on entry and remains so on return.
|
|
*/
|
|
static void
|
|
ulfsdirhash_delslot(struct dirhash *dh, int slot)
|
|
{
|
|
int i;
|
|
|
|
KASSERT(mutex_owned(&dh->dh_lock));
|
|
|
|
/* Mark the entry as deleted. */
|
|
DH_ENTRY(dh, slot) = DIRHASH_DEL;
|
|
|
|
/* If this is the end of a chain of DIRHASH_DEL slots, remove them. */
|
|
for (i = slot; DH_ENTRY(dh, i) == DIRHASH_DEL; )
|
|
i = WRAPINCR(i, dh->dh_hlen);
|
|
if (DH_ENTRY(dh, i) == DIRHASH_EMPTY) {
|
|
i = WRAPDECR(i, dh->dh_hlen);
|
|
while (DH_ENTRY(dh, i) == DIRHASH_DEL) {
|
|
DH_ENTRY(dh, i) = DIRHASH_EMPTY;
|
|
dh->dh_hused--;
|
|
i = WRAPDECR(i, dh->dh_hlen);
|
|
}
|
|
KASSERT(dh->dh_hused >= 0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Given a directory entry and its offset, find the offset of the
|
|
* previous entry in the same DIRBLKSIZ-sized block. Returns an
|
|
* offset, or -1 if there is no previous entry in the block or some
|
|
* other problem occurred.
|
|
*/
|
|
static doff_t
|
|
ulfsdirhash_getprev(struct lfs_direct *dirp, doff_t offset, int dirblksiz)
|
|
{
|
|
struct lfs_direct *dp;
|
|
char *blkbuf;
|
|
doff_t blkoff, prevoff;
|
|
int entrypos, i;
|
|
|
|
blkoff = offset & ~(dirblksiz - 1); /* offset of start of block */
|
|
entrypos = offset & (dirblksiz - 1); /* entry relative to block */
|
|
blkbuf = (char *)dirp - entrypos;
|
|
prevoff = blkoff;
|
|
|
|
/* If `offset' is the start of a block, there is no previous entry. */
|
|
if (entrypos == 0)
|
|
return (-1);
|
|
|
|
/* Scan from the start of the block until we get to the entry. */
|
|
for (i = 0; i < entrypos; i += dp->d_reclen) {
|
|
dp = (struct lfs_direct *)(blkbuf + i);
|
|
if (dp->d_reclen == 0 || i + dp->d_reclen > entrypos)
|
|
return (-1); /* Corrupted directory. */
|
|
prevoff = blkoff + i;
|
|
}
|
|
return (prevoff);
|
|
}
|
|
|
|
/*
|
|
* Try to free up `wanted' bytes by stealing memory from existing
|
|
* dirhashes. Returns zero with list locked if successful.
|
|
*/
|
|
static int
|
|
ulfsdirhash_recycle(int wanted)
|
|
{
|
|
struct dirhash *dh;
|
|
doff_t **hash;
|
|
u_int8_t *blkfree;
|
|
int i, mem, narrays;
|
|
size_t hashsz, blkfreesz;
|
|
|
|
DIRHASHLIST_LOCK();
|
|
while (wanted + ulfs_dirhashmem > ulfs_dirhashmaxmem) {
|
|
/* Find a dirhash, and lock it. */
|
|
if ((dh = TAILQ_FIRST(&ulfsdirhash_list)) == NULL) {
|
|
DIRHASHLIST_UNLOCK();
|
|
return (-1);
|
|
}
|
|
DIRHASH_LOCK(dh);
|
|
KASSERT(dh->dh_hash != NULL);
|
|
|
|
/* Decrement the score; only recycle if it becomes zero. */
|
|
if (--dh->dh_score > 0) {
|
|
DIRHASH_UNLOCK(dh);
|
|
DIRHASHLIST_UNLOCK();
|
|
return (-1);
|
|
}
|
|
|
|
/* Remove it from the list and detach its memory. */
|
|
TAILQ_REMOVE(&ulfsdirhash_list, dh, dh_list);
|
|
dh->dh_onlist = 0;
|
|
hash = dh->dh_hash;
|
|
hashsz = dh->dh_hashsz;
|
|
dh->dh_hash = NULL;
|
|
blkfree = dh->dh_blkfree;
|
|
blkfreesz = dh->dh_blkfreesz;
|
|
dh->dh_blkfree = NULL;
|
|
narrays = dh->dh_narrays;
|
|
mem = narrays * sizeof(*dh->dh_hash) +
|
|
narrays * DH_NBLKOFF * sizeof(**dh->dh_hash) +
|
|
dh->dh_nblk * sizeof(*dh->dh_blkfree);
|
|
|
|
/* Unlock everything, free the detached memory. */
|
|
DIRHASH_UNLOCK(dh);
|
|
DIRHASHLIST_UNLOCK();
|
|
|
|
for (i = 0; i < narrays; i++)
|
|
DIRHASH_BLKFREE(hash[i]);
|
|
kmem_free(hash, hashsz);
|
|
kmem_free(blkfree, blkfreesz);
|
|
|
|
/* Account for the returned memory, and repeat if necessary. */
|
|
DIRHASHLIST_LOCK();
|
|
atomic_add_int(&ulfs_dirhashmem, -mem);
|
|
}
|
|
/* Success. */
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
ulfsdirhash_sysctl_init(void)
|
|
{
|
|
const struct sysctlnode *rnode, *cnode;
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, NULL, &rnode,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "vfs", NULL,
|
|
NULL, 0, NULL, 0,
|
|
CTL_VFS, CTL_EOL);
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, &rnode, &rnode,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "ulfs",
|
|
SYSCTL_DESCR("ulfs"),
|
|
NULL, 0, NULL, 0,
|
|
CTL_CREATE, CTL_EOL);
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, &rnode, &rnode,
|
|
CTLFLAG_PERMANENT,
|
|
CTLTYPE_NODE, "dirhash",
|
|
SYSCTL_DESCR("dirhash"),
|
|
NULL, 0, NULL, 0,
|
|
CTL_CREATE, CTL_EOL);
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, &rnode, &cnode,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "minblocks",
|
|
SYSCTL_DESCR("minimum hashed directory size in blocks"),
|
|
NULL, 0, &ulfs_dirhashminblks, 0,
|
|
CTL_CREATE, CTL_EOL);
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, &rnode, &cnode,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "maxmem",
|
|
SYSCTL_DESCR("maximum dirhash memory usage"),
|
|
NULL, 0, &ulfs_dirhashmaxmem, 0,
|
|
CTL_CREATE, CTL_EOL);
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, &rnode, &cnode,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READONLY,
|
|
CTLTYPE_INT, "memused",
|
|
SYSCTL_DESCR("current dirhash memory usage"),
|
|
NULL, 0, &ulfs_dirhashmem, 0,
|
|
CTL_CREATE, CTL_EOL);
|
|
|
|
sysctl_createv(&ulfsdirhash_sysctl_log, 0, &rnode, &cnode,
|
|
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
|
|
CTLTYPE_INT, "docheck",
|
|
SYSCTL_DESCR("enable extra sanity checks"),
|
|
NULL, 0, &ulfs_dirhashcheck, 0,
|
|
CTL_CREATE, CTL_EOL);
|
|
}
|
|
|
|
void
|
|
ulfsdirhash_init(void)
|
|
{
|
|
|
|
mutex_init(&ulfsdirhash_lock, MUTEX_DEFAULT, IPL_NONE);
|
|
ulfsdirhashblk_cache = pool_cache_init(DH_NBLKOFF * sizeof(daddr_t), 0,
|
|
0, 0, "dirhashblk", NULL, IPL_NONE, NULL, NULL, NULL);
|
|
ulfsdirhash_cache = pool_cache_init(sizeof(struct dirhash), 0,
|
|
0, 0, "dirhash", NULL, IPL_NONE, NULL, NULL, NULL);
|
|
TAILQ_INIT(&ulfsdirhash_list);
|
|
ulfsdirhash_sysctl_init();
|
|
}
|
|
|
|
void
|
|
ulfsdirhash_done(void)
|
|
{
|
|
|
|
KASSERT(TAILQ_EMPTY(&ulfsdirhash_list));
|
|
pool_cache_destroy(ulfsdirhashblk_cache);
|
|
pool_cache_destroy(ulfsdirhash_cache);
|
|
mutex_destroy(&ulfsdirhash_lock);
|
|
sysctl_teardown(&ulfsdirhash_sysctl_log);
|
|
}
|