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NetBSD/sys/ufs/lfs/lfs_alloc.c

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/* $NetBSD: lfs_alloc.c,v 1.55 2002/02/04 03:32:16 perseant Exp $ */
/*-
* Copyright (c) 1999, 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Konrad E. Schroder <perseant@hhhh.org>.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
*/
/*
* Copyright (c) 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)lfs_alloc.c 8.4 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: lfs_alloc.c,v 1.55 2002/02/04 03:32:16 perseant Exp $");
#if defined(_KERNEL_OPT)
#include "opt_quota.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/syslog.h>
#include <sys/mount.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/proc.h>
#include <ufs/ufs/quota.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufsmount.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/lfs/lfs.h>
#include <ufs/lfs/lfs_extern.h>
extern int lfs_dirvcount;
extern struct lock ufs_hashlock;
static int extend_ifile(struct lfs *, struct ucred *);
static int lfs_ialloc(struct lfs *, struct vnode *, ino_t, int, struct vnode **);
/*
* Allocate a particular inode with a particular version number, freeing
* any previous versions of this inode that may have gone before.
* Used by the roll-forward code.
*
* XXX this function does not have appropriate locking to be used on a live fs;
* XXX but something similar could probably be used for an "undelete" call.
*/
int
lfs_rf_valloc(struct lfs *fs, ino_t ino, int version, struct proc *p,
struct vnode **vpp)
{
IFILE *ifp;
struct buf *bp, *cbp;
struct vnode *vp;
struct inode *ip;
ino_t tino, oldnext;
int error;
CLEANERINFO *cip;
/*
* First, just try a vget. If the version number is the one we want,
* we don't have to do anything else. If the version number is wrong,
* take appropriate action.
*/
error = VFS_VGET(fs->lfs_ivnode->v_mount, ino, &vp);
if (error == 0) {
/* printf("lfs_rf_valloc[1]: ino %d vp %p\n", ino, vp); */
*vpp = vp;
ip = VTOI(vp);
if (ip->i_ffs_gen == version)
return 0;
else if (ip->i_ffs_gen < version) {
VOP_TRUNCATE(vp, (off_t)0, 0, NOCRED, p);
ip->i_ffs_gen = version;
LFS_SET_UINO(ip, IN_CHANGE | IN_MODIFIED | IN_UPDATE);
return 0;
} else {
/* printf("ino %d: asked for version %d but got %d\n",
ino, version, ip->i_ffs_gen); */
vput(vp);
*vpp = NULLVP;
return EEXIST;
}
}
/*
* The inode is not in use. Find it on the free list.
*/
/* If the Ifile is too short to contain this inum, extend it */
while (VTOI(fs->lfs_ivnode)->i_ffs_size <= (ino /
fs->lfs_ifpb + fs->lfs_cleansz + fs->lfs_segtabsz)
<< fs->lfs_bshift) {
extend_ifile(fs, NOCRED);
}
LFS_IENTRY(ifp, fs, ino, bp);
oldnext = ifp->if_nextfree;
ifp->if_version = version;
brelse(bp);
LFS_GET_HEADFREE(fs, cip, cbp, &ino);
if (ino) {
LFS_PUT_HEADFREE(fs, cip, cbp, oldnext);
} else {
tino = ino;
while (1) {
LFS_IENTRY(ifp, fs, tino, bp);
if (ifp->if_nextfree == ino ||
ifp->if_nextfree == LFS_UNUSED_INUM)
break;
tino = ifp->if_nextfree;
brelse(bp);
}
if (ifp->if_nextfree == LFS_UNUSED_INUM) {
brelse(bp);
return ENOENT;
}
ifp->if_nextfree = oldnext;
VOP_BWRITE(bp);
}
error = lfs_ialloc(fs, fs->lfs_ivnode, ino, version, &vp);
if (error == 0) {
/*
* Make it VREG so we can put blocks on it. We will change
* this later if it turns out to be some other kind of file.
*/
ip = VTOI(vp);
ip->i_ffs_mode = IFREG;
ip->i_ffs_nlink = 1;
ip->i_ffs_effnlink = 1;
ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, &vp);
ip = VTOI(vp);
/* printf("lfs_rf_valloc: ino %d vp %p\n", ino, vp); */
/* The dirop-nature of this vnode is past */
(void)lfs_vunref(vp);
--lfs_dirvcount;
vp->v_flag &= ~VDIROP;
--fs->lfs_nadirop;
ip->i_flag &= ~IN_ADIROP;
}
*vpp = vp;
return error;
}
static int
extend_ifile(struct lfs *fs, struct ucred *cred)
{
struct vnode *vp;
struct inode *ip;
IFILE *ifp;
IFILE_V1 *ifp_v1;
struct buf *bp, *cbp;
int error;
ufs_daddr_t i, blkno, max;
ino_t oldlast;
CLEANERINFO *cip;
vp = fs->lfs_ivnode;
(void)lfs_vref(vp);
vn_lock(vp, LK_EXCLUSIVE | LK_RETRY);
ip = VTOI(vp);
blkno = lblkno(fs, ip->i_ffs_size);
if ((error = VOP_BALLOC(vp, ip->i_ffs_size, fs->lfs_bsize, cred, 0,
&bp)) != 0) {
VOP_UNLOCK(vp, 0);
lfs_vunref(vp);
return (error);
}
ip->i_ffs_size += fs->lfs_bsize;
uvm_vnp_setsize(vp, ip->i_ffs_size);
VOP_UNLOCK(vp, 0);
i = (blkno - fs->lfs_segtabsz - fs->lfs_cleansz) *
fs->lfs_ifpb;
LFS_GET_HEADFREE(fs, cip, cbp, &oldlast);
LFS_PUT_HEADFREE(fs, cip, cbp, i);
#ifdef DIAGNOSTIC
if (fs->lfs_free == LFS_UNUSED_INUM)
panic("inode 0 allocated [2]");
#endif /* DIAGNOSTIC */
max = i + fs->lfs_ifpb;
/* printf("extend_ifile: new block ino %d--%d\n", i, max - 1); */
if (fs->lfs_version == 1) {
for (ifp_v1 = (IFILE_V1 *)bp->b_data; i < max; ++ifp_v1) {
ifp_v1->if_version = 1;
ifp_v1->if_daddr = LFS_UNUSED_DADDR;
ifp_v1->if_nextfree = ++i;
}
ifp_v1--;
ifp_v1->if_nextfree = oldlast;
} else {
for (ifp = (IFILE *)bp->b_data; i < max; ++ifp) {
ifp->if_version = 1;
ifp->if_daddr = LFS_UNUSED_DADDR;
ifp->if_nextfree = ++i;
}
ifp--;
ifp->if_nextfree = oldlast;
}
LFS_PUT_TAILFREE(fs, cip, cbp, max - 1);
(void) VOP_BWRITE(bp); /* Ifile */
lfs_vunref(vp);
return 0;
}
/* Allocate a new inode. */
/* ARGSUSED */
/* VOP_BWRITE 2i times */
int
lfs_valloc(void *v)
{
struct vop_valloc_args /* {
struct vnode *a_pvp;
int a_mode;
struct ucred *a_cred;
struct vnode **a_vpp;
} */ *ap = v;
struct lfs *fs;
struct buf *bp, *cbp;
struct ifile *ifp;
ino_t new_ino;
int error;
int new_gen;
CLEANERINFO *cip;
fs = VTOI(ap->a_pvp)->i_lfs;
if (fs->lfs_ronly)
return EROFS;
*ap->a_vpp = NULL;
if (fs->lfs_version == 1) {
/*
* Use lfs_seglock here, instead of fs->lfs_freelock, to
* ensure that the free list is not changed in between
* the time that the ifile blocks are written to disk
* and the time that the superblock is written to disk.
*/
lfs_seglock(fs, SEGM_PROT);
} else {
lockmgr(&fs->lfs_freelock, LK_EXCLUSIVE, 0);
}
/* Get the head of the freelist. */
LFS_GET_HEADFREE(fs, cip, cbp, &new_ino);
#ifdef DIAGNOSTIC
if (new_ino == LFS_UNUSED_INUM) {
#ifdef DEBUG
lfs_dump_super(fs);
#endif /* DEBUG */
panic("inode 0 allocated [1]");
}
#endif /* DIAGNOSTIC */
#ifdef ALLOCPRINT
printf("lfs_valloc: allocate inode %d\n", new_ino);
#endif
/*
* Remove the inode from the free list and write the new start
* of the free list into the superblock.
*/
LFS_IENTRY(ifp, fs, new_ino, bp);
if (ifp->if_daddr != LFS_UNUSED_DADDR)
panic("lfs_valloc: inuse inode %d on the free list", new_ino);
LFS_PUT_HEADFREE(fs, cip, cbp, ifp->if_nextfree);
/* printf("lfs_valloc: headfree %d -> %d\n", new_ino, ifp->if_nextfree); */
new_gen = ifp->if_version; /* version was updated by vfree */
brelse(bp);
/* Extend IFILE so that the next lfs_valloc will succeed. */
if (fs->lfs_free == LFS_UNUSED_INUM) {
if ((error = extend_ifile(fs, ap->a_cred)) != 0) {
LFS_PUT_HEADFREE(fs, cip, cbp, new_ino);
if (fs->lfs_version == 1)
lfs_segunlock(fs);
else
lockmgr(&fs->lfs_freelock, LK_RELEASE, 0);
return error;
}
}
#ifdef DIAGNOSTIC
if (fs->lfs_free == LFS_UNUSED_INUM)
panic("inode 0 allocated [3]");
#endif /* DIAGNOSTIC */
if (fs->lfs_version == 1)
lfs_segunlock(fs);
else
lockmgr(&fs->lfs_freelock, LK_RELEASE, 0);
return lfs_ialloc(fs, ap->a_pvp, new_ino, new_gen, ap->a_vpp);
}
static int
lfs_ialloc(struct lfs *fs, struct vnode *pvp, ino_t new_ino, int new_gen,
struct vnode **vpp)
{
struct inode *ip;
struct vnode *vp;
IFILE *ifp;
struct buf *bp, *cbp;
int error;
CLEANERINFO *cip;
error = getnewvnode(VT_LFS, pvp->v_mount, lfs_vnodeop_p, &vp);
/* printf("lfs_ialloc: ino %d vp %p error %d\n", new_ino, vp, error);*/
if (error)
goto errout;
lockmgr(&ufs_hashlock, LK_EXCLUSIVE, 0);
/* Create an inode to associate with the vnode. */
lfs_vcreate(pvp->v_mount, new_ino, vp);
ip = VTOI(vp);
LFS_SET_UINO(ip, IN_CHANGE | IN_MODIFIED);
/* Zero out the direct and indirect block addresses. */
bzero(&ip->i_din, sizeof(ip->i_din));
ip->i_din.ffs_din.di_inumber = new_ino;
/* Set a new generation number for this inode. */
if (new_gen)
ip->i_ffs_gen = new_gen;
/* Insert into the inode hash table. */
ufs_ihashins(ip);
lockmgr(&ufs_hashlock, LK_RELEASE, 0);
ufs_vinit(vp->v_mount, lfs_specop_p, lfs_fifoop_p, &vp);
ip = VTOI(vp);
/* printf("lfs_ialloc[2]: ino %d vp %p\n", new_ino, vp);*/
uvm_vnp_setsize(vp, 0);
*vpp = vp;
#if 1
if (!(vp->v_flag & VDIROP)) {
(void)lfs_vref(vp);
++lfs_dirvcount;
}
vp->v_flag |= VDIROP;
if (!(ip->i_flag & IN_ADIROP))
++fs->lfs_nadirop;
ip->i_flag |= IN_ADIROP;
#endif
genfs_node_init(vp, &lfs_genfsops);
VREF(ip->i_devvp);
/* Set superblock modified bit and increment file count. */
fs->lfs_fmod = 1;
++fs->lfs_nfiles;
return (0);
errout:
/*
* Put the new inum back on the free list.
*/
LFS_IENTRY(ifp, fs, new_ino, bp);
ifp->if_daddr = LFS_UNUSED_DADDR;
LFS_GET_HEADFREE(fs, cip, cbp, &(ifp->if_nextfree));
LFS_PUT_HEADFREE(fs, cip, cbp, new_ino);
(void) VOP_BWRITE(bp); /* Ifile */
*vpp = NULLVP;
return (error);
}
/* Create a new vnode/inode pair and initialize what fields we can. */
void
lfs_vcreate(struct mount *mp, ino_t ino, struct vnode *vp)
{
struct inode *ip;
struct ufsmount *ump;
#ifdef QUOTA
int i;
#endif
/* Get a pointer to the private mount structure. */
ump = VFSTOUFS(mp);
/* Initialize the inode. */
ip = pool_get(&lfs_inode_pool, PR_WAITOK);
vp->v_data = ip;
ip->i_vnode = vp;
ip->i_devvp = ump->um_devvp;
ip->i_dev = ump->um_dev;
ip->i_number = ip->i_din.ffs_din.di_inumber = ino;
ip->i_lfs = ump->um_lfs;
#ifdef QUOTA
for (i = 0; i < MAXQUOTAS; i++)
ip->i_dquot[i] = NODQUOT;
#endif
ip->i_lockf = 0;
ip->i_diroff = 0;
ip->i_ffs_mode = 0;
ip->i_ffs_size = 0;
ip->i_ffs_blocks = 0;
ip->i_lfs_effnblks = 0;
ip->i_flag = 0;
/* Why was IN_MODIFIED ever set here? */
/* LFS_SET_UINO(ip, IN_CHANGE | IN_MODIFIED); */
}
/* Free an inode. */
/* ARGUSED */
/* VOP_BWRITE 2i times */
int
lfs_vfree(void *v)
{
struct vop_vfree_args /* {
struct vnode *a_pvp;
ino_t a_ino;
int a_mode;
} */ *ap = v;
SEGUSE *sup;
CLEANERINFO *cip;
struct buf *cbp, *bp;
struct ifile *ifp;
struct inode *ip;
struct vnode *vp;
struct lfs *fs;
ufs_daddr_t old_iaddr;
ino_t ino, otail;
extern int lfs_dirvcount;
/* Get the inode number and file system. */
vp = ap->a_pvp;
ip = VTOI(vp);
fs = ip->i_lfs;
ino = ip->i_number;
/* Drain of pending writes */
if (fs->lfs_version > 1 && WRITEINPROG(vp))
tsleep(vp, (PRIBIO+1), "lfs_vfree", 0);
if (fs->lfs_version == 1)
lfs_seglock(fs, SEGM_PROT);
else
lockmgr(&fs->lfs_freelock, LK_EXCLUSIVE, 0);
if (vp->v_flag & VDIROP) {
--lfs_dirvcount;
vp->v_flag &= ~VDIROP;
wakeup(&lfs_dirvcount);
lfs_vunref(vp);
}
if (ip->i_flag & IN_ADIROP) {
--fs->lfs_nadirop;
ip->i_flag &= ~IN_ADIROP;
}
LFS_CLR_UINO(ip, IN_ACCESSED|IN_CLEANING|IN_MODIFIED);
ip->i_flag &= ~IN_ALLMOD;
/*
* Set the ifile's inode entry to unused, increment its version number
* and link it onto the free chain.
*/
LFS_IENTRY(ifp, fs, ino, bp);
old_iaddr = ifp->if_daddr;
ifp->if_daddr = LFS_UNUSED_DADDR;
++ifp->if_version;
if (fs->lfs_version == 1) {
LFS_GET_HEADFREE(fs, cip, cbp, &(ifp->if_nextfree));
LFS_PUT_HEADFREE(fs, cip, cbp, ino);
(void) VOP_BWRITE(bp); /* Ifile */
} else {
ifp->if_nextfree = LFS_UNUSED_INUM;
/*
* XXX Writing the freed node here means that it might not
* XXX make it into the free list in the event of a crash
* XXX (the ifile could be written before the rest of this
* XXX completes).
*/
(void) VOP_BWRITE(bp); /* Ifile */
LFS_GET_TAILFREE(fs, cip, cbp, &otail);
LFS_IENTRY(ifp, fs, otail, bp);
ifp->if_nextfree = ino;
VOP_BWRITE(bp);
LFS_PUT_TAILFREE(fs, cip, cbp, ino);
/* printf("lfs_vfree: tailfree %d -> %d\n", otail, ino); */
}
#ifdef DIAGNOSTIC
if (ino == LFS_UNUSED_INUM) {
panic("inode 0 freed");
}
#endif /* DIAGNOSTIC */
if (old_iaddr != LFS_UNUSED_DADDR) {
LFS_SEGENTRY(sup, fs, dtosn(fs, old_iaddr), bp);
#ifdef DIAGNOSTIC
if (sup->su_nbytes < DINODE_SIZE) {
printf("lfs_vfree: negative byte count"
" (segment %d short by %d)\n",
dtosn(fs, old_iaddr),
(int)DINODE_SIZE - sup->su_nbytes);
panic("lfs_vfree: negative byte count");
sup->su_nbytes = DINODE_SIZE;
}
#endif
sup->su_nbytes -= DINODE_SIZE;
(void) VOP_BWRITE(bp); /* Ifile */
}
/* Set superblock modified bit and decrement file count. */
fs->lfs_fmod = 1;
--fs->lfs_nfiles;
if (fs->lfs_version == 1)
lfs_segunlock(fs);
else
lockmgr(&fs->lfs_freelock, LK_RELEASE, 0);
return (0);
}
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