minix/sys/ufs/ufs/ufs_inode.c
Lionel Sambuc 84d9c625bf Synchronize on NetBSD-CVS (2013/12/1 12:00:00 UTC)
- 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
2014-07-28 17:05:06 +02:00

311 lines
8.4 KiB
C

/* $NetBSD: ufs_inode.c,v 1.89 2013/01/22 09:39:18 dholland Exp $ */
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ufs_inode.c 8.9 (Berkeley) 5/14/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ufs_inode.c,v 1.89 2013/01/22 09:39:18 dholland Exp $");
#if defined(_KERNEL_OPT)
#include "opt_ffs.h"
#include "opt_quota.h"
#include "opt_wapbl.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/namei.h>
#include <sys/kauth.h>
#include <sys/wapbl.h>
#include <sys/fstrans.h>
#include <sys/kmem.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ufs/ufs_wapbl.h>
#ifdef UFS_DIRHASH
#include <ufs/ufs/dirhash.h>
#endif
#ifdef UFS_EXTATTR
#include <ufs/ufs/extattr.h>
#endif
#include <uvm/uvm.h>
extern int prtactive;
/*
* Last reference to an inode. If necessary, write or delete it.
*/
int
ufs_inactive(void *v)
{
struct vop_inactive_args /* {
struct vnode *a_vp;
struct bool *a_recycle;
} */ *ap = v;
struct vnode *vp = ap->a_vp;
struct inode *ip = VTOI(vp);
struct mount *transmp;
mode_t mode;
int error = 0;
int logged = 0;
UFS_WAPBL_JUNLOCK_ASSERT(vp->v_mount);
transmp = vp->v_mount;
fstrans_start(transmp, FSTRANS_LAZY);
/*
* Ignore inodes related to stale file handles.
*/
if (ip->i_mode == 0)
goto out;
if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) {
#ifdef UFS_EXTATTR
ufs_extattr_vnode_inactive(vp, curlwp);
#endif
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
logged = 1;
if (ip->i_size != 0) {
/*
* When journaling, only truncate one indirect block
* at a time
*/
if (vp->v_mount->mnt_wapbl) {
uint64_t incr = MNINDIR(ip->i_ump) <<
vp->v_mount->mnt_fs_bshift; /* Power of 2 */
uint64_t base = UFS_NDADDR <<
vp->v_mount->mnt_fs_bshift;
while (!error && ip->i_size > base + incr) {
/*
* round down to next full indirect
* block boundary.
*/
uint64_t nsize = base +
((ip->i_size - base - 1) &
~(incr - 1));
error = UFS_TRUNCATE(vp, nsize, 0,
NOCRED);
if (error)
break;
UFS_WAPBL_END(vp->v_mount);
error = UFS_WAPBL_BEGIN(vp->v_mount);
if (error)
goto out;
}
}
if (!error)
error = UFS_TRUNCATE(vp, (off_t)0, 0, NOCRED);
}
#if defined(QUOTA) || defined(QUOTA2)
(void)chkiq(ip, -1, NOCRED, 0);
#endif
DIP_ASSIGN(ip, rdev, 0);
mode = ip->i_mode;
ip->i_mode = 0;
ip->i_omode = mode;
DIP_ASSIGN(ip, mode, 0);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
/*
* Defer final inode free and update to ufs_reclaim().
*/
}
if (ip->i_flag & (IN_CHANGE | IN_UPDATE | IN_MODIFIED)) {
if (!logged++) {
int err;
err = UFS_WAPBL_BEGIN(vp->v_mount);
if (err)
goto out;
}
UFS_UPDATE(vp, NULL, NULL, 0);
}
if (logged)
UFS_WAPBL_END(vp->v_mount);
out:
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
*ap->a_recycle = (ip->i_mode == 0);
VOP_UNLOCK(vp);
fstrans_done(transmp);
return (error);
}
/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
ufs_reclaim(struct vnode *vp)
{
struct inode *ip = VTOI(vp);
if (prtactive && vp->v_usecount > 1)
vprint("ufs_reclaim: pushing active", vp);
if (!UFS_WAPBL_BEGIN(vp->v_mount)) {
UFS_UPDATE(vp, NULL, NULL, UPDATE_CLOSE);
UFS_WAPBL_END(vp->v_mount);
}
UFS_UPDATE(vp, NULL, NULL, UPDATE_CLOSE);
/*
* Remove the inode from its hash chain.
*/
ufs_ihashrem(ip);
if (ip->i_devvp) {
vrele(ip->i_devvp);
ip->i_devvp = 0;
}
#if defined(QUOTA) || defined(QUOTA2)
ufsquota_free(ip);
#endif
#ifdef UFS_DIRHASH
if (ip->i_dirhash != NULL)
ufsdirhash_free(ip);
#endif
return (0);
}
/*
* allocate a range of blocks in a file.
* after this function returns, any page entirely contained within the range
* will map to invalid data and thus must be overwritten before it is made
* accessible to others.
*/
int
ufs_balloc_range(struct vnode *vp, off_t off, off_t len, kauth_cred_t cred,
int flags)
{
off_t neweof; /* file size after the operation */
off_t neweob; /* offset next to the last block after the operation */
off_t pagestart; /* starting offset of range covered by pgs */
off_t eob; /* offset next to allocated blocks */
struct uvm_object *uobj;
int i, delta, error, npages;
int bshift = vp->v_mount->mnt_fs_bshift;
int bsize = 1 << bshift;
int ppb = MAX(bsize >> PAGE_SHIFT, 1);
struct vm_page **pgs;
size_t pgssize;
UVMHIST_FUNC("ufs_balloc_range"); UVMHIST_CALLED(ubchist);
UVMHIST_LOG(ubchist, "vp %p off 0x%x len 0x%x u_size 0x%x",
vp, off, len, vp->v_size);
neweof = MAX(vp->v_size, off + len);
GOP_SIZE(vp, neweof, &neweob, 0);
error = 0;
uobj = &vp->v_uobj;
/*
* read or create pages covering the range of the allocation and
* keep them locked until the new block is allocated, so there
* will be no window where the old contents of the new block are
* visible to racing threads.
*/
pagestart = trunc_page(off) & ~(bsize - 1);
npages = MIN(ppb, (round_page(neweob) - pagestart) >> PAGE_SHIFT);
pgssize = npages * sizeof(struct vm_page *);
pgs = kmem_zalloc(pgssize, KM_SLEEP);
/*
* adjust off to be block-aligned.
*/
delta = off & (bsize - 1);
off -= delta;
len += delta;
genfs_node_wrlock(vp);
mutex_enter(uobj->vmobjlock);
error = VOP_GETPAGES(vp, pagestart, pgs, &npages, 0,
VM_PROT_WRITE, 0, PGO_SYNCIO | PGO_PASTEOF | PGO_NOBLOCKALLOC |
PGO_NOTIMESTAMP | PGO_GLOCKHELD);
if (error) {
goto out;
}
/*
* now allocate the range.
*/
error = GOP_ALLOC(vp, off, len, flags, cred);
genfs_node_unlock(vp);
/*
* if the allocation succeeded, clear PG_CLEAN on all the pages
* and clear PG_RDONLY on any pages that are now fully backed
* by disk blocks. if the allocation failed, we do not invalidate
* the pages since they might have already existed and been dirty,
* in which case we need to keep them around. if we created the pages,
* they will be clean and read-only, and leaving such pages
* in the cache won't cause any problems.
*/
GOP_SIZE(vp, off + len, &eob, 0);
mutex_enter(uobj->vmobjlock);
mutex_enter(&uvm_pageqlock);
for (i = 0; i < npages; i++) {
KASSERT((pgs[i]->flags & PG_RELEASED) == 0);
if (!error) {
if (off <= pagestart + (i << PAGE_SHIFT) &&
pagestart + ((i + 1) << PAGE_SHIFT) <= eob) {
pgs[i]->flags &= ~PG_RDONLY;
}
pgs[i]->flags &= ~PG_CLEAN;
}
uvm_pageactivate(pgs[i]);
}
mutex_exit(&uvm_pageqlock);
uvm_page_unbusy(pgs, npages);
mutex_exit(uobj->vmobjlock);
out:
kmem_free(pgs, pgssize);
return error;
}