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NetBSD/sys/ufs/ext2fs/ext2fs_balloc.c

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/* $NetBSD: ext2fs_balloc.c,v 1.17 2002/05/05 17:01:41 chs Exp $ */
/*
* Copyright (c) 1997 Manuel Bouyer.
* Copyright (c) 1982, 1986, 1989, 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.
*
* @(#)ffs_balloc.c 8.4 (Berkeley) 9/23/93
* Modified for ext2fs by Manuel Bouyer.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ext2fs_balloc.c,v 1.17 2002/05/05 17:01:41 chs Exp $");
#if defined(_KERNEL_OPT)
#include "opt_uvmhist.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/file.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <uvm/uvm.h>
#include <ufs/ufs/inode.h>
#include <ufs/ufs/ufs_extern.h>
#include <ufs/ext2fs/ext2fs.h>
#include <ufs/ext2fs/ext2fs_extern.h>
/*
* Balloc defines the structure of file system storage
* by allocating the physical blocks on a device given
* the inode and the logical block number in a file.
*/
int
ext2fs_balloc(ip, bn, size, cred, bpp, flags)
struct inode *ip;
ufs_daddr_t bn;
int size;
struct ucred *cred;
struct buf **bpp;
int flags;
{
struct m_ext2fs *fs;
ufs_daddr_t nb;
struct buf *bp, *nbp;
struct vnode *vp = ITOV(ip);
struct indir indirs[NIADDR + 2];
ufs_daddr_t newb, lbn, *bap, pref;
int num, i, error;
u_int deallocated;
ufs_daddr_t *allocib, *blkp, *allocblk, allociblk[NIADDR + 1];
int unwindidx = -1;
UVMHIST_FUNC("ext2fs_balloc"); UVMHIST_CALLED(ubchist);
UVMHIST_LOG(ubchist, "bn 0x%x", bn,0,0,0);
if (bpp != NULL) {
*bpp = NULL;
}
if (bn < 0)
return (EFBIG);
fs = ip->i_e2fs;
lbn = bn;
/*
* The first NDADDR blocks are direct blocks
*/
if (bn < NDADDR) {
nb = fs2h32(ip->i_e2fs_blocks[bn]);
if (nb != 0) {
/*
* the block is already allocated, just read it.
*/
if (bpp != NULL) {
error = bread(vp, bn, fs->e2fs_bsize, NOCRED,
&bp);
if (error) {
brelse(bp);
return (error);
}
*bpp = bp;
}
return (0);
}
/*
* allocate a new direct block.
*/
error = ext2fs_alloc(ip, bn,
ext2fs_blkpref(ip, bn, bn, &ip->i_e2fs_blocks[0]),
cred, &newb);
if (error)
return (error);
ip->i_e2fs_last_lblk = lbn;
ip->i_e2fs_last_blk = newb;
ip->i_e2fs_blocks[bn] = h2fs32(newb);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
if (bpp != NULL) {
bp = getblk(vp, bn, fs->e2fs_bsize, 0, 0);
bp->b_blkno = fsbtodb(fs, newb);
if (flags & B_CLRBUF)
clrbuf(bp);
*bpp = bp;
}
return (0);
}
/*
* Determine the number of levels of indirection.
*/
pref = 0;
if ((error = ufs_getlbns(vp, bn, indirs, &num)) != 0)
return(error);
#ifdef DIAGNOSTIC
if (num < 1)
panic ("ext2fs_balloc: ufs_getlbns returned indirect block\n");
#endif
/*
* Fetch the first indirect block allocating if necessary.
*/
--num;
nb = fs2h32(ip->i_e2fs_blocks[NDADDR + indirs[0].in_off]);
allocib = NULL;
allocblk = allociblk;
if (nb == 0) {
pref = ext2fs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0);
error = ext2fs_alloc(ip, lbn, pref, cred, &newb);
if (error)
return (error);
nb = newb;
*allocblk++ = nb;
ip->i_e2fs_last_blk = newb;
bp = getblk(vp, indirs[1].in_lbn, fs->e2fs_bsize, 0, 0);
bp->b_blkno = fsbtodb(fs, newb);
clrbuf(bp);
/*
* Write synchronously so that indirect blocks
* never point at garbage.
*/
if ((error = bwrite(bp)) != 0)
goto fail;
unwindidx = 0;
allocib = &ip->i_e2fs_blocks[NDADDR + indirs[0].in_off];
*allocib = h2fs32(newb);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
}
/*
* Fetch through the indirect blocks, allocating as necessary.
*/
for (i = 1;;) {
error = bread(vp,
indirs[i].in_lbn, (int)fs->e2fs_bsize, NOCRED, &bp);
if (error) {
brelse(bp);
goto fail;
}
bap = (ufs_daddr_t *)bp->b_data;
nb = fs2h32(bap[indirs[i].in_off]);
if (i == num)
break;
i++;
if (nb != 0) {
brelse(bp);
continue;
}
pref = ext2fs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0);
error = ext2fs_alloc(ip, lbn, pref, cred, &newb);
if (error) {
brelse(bp);
goto fail;
}
nb = newb;
*allocblk++ = nb;
ip->i_e2fs_last_blk = newb;
nbp = getblk(vp, indirs[i].in_lbn, fs->e2fs_bsize, 0, 0);
nbp->b_blkno = fsbtodb(fs, nb);
clrbuf(nbp);
/*
* Write synchronously so that indirect blocks
* never point at garbage.
*/
if ((error = bwrite(nbp)) != 0) {
brelse(bp);
goto fail;
}
if (unwindidx < 0)
unwindidx = i - 1;
bap[indirs[i - 1].in_off] = h2fs32(nb);
/*
* If required, write synchronously, otherwise use
* delayed write.
*/
if (flags & B_SYNC) {
bwrite(bp);
} else {
bdwrite(bp);
}
}
/*
* Get the data block, allocating if necessary.
*/
if (nb == 0) {
pref = ext2fs_blkpref(ip, lbn, indirs[num].in_off, &bap[0]);
error = ext2fs_alloc(ip, lbn, pref, cred, &newb);
if (error) {
brelse(bp);
goto fail;
}
nb = newb;
*allocblk++ = nb;
ip->i_e2fs_last_lblk = lbn;
ip->i_e2fs_last_blk = newb;
bap[indirs[num].in_off] = h2fs32(nb);
/*
* If required, write synchronously, otherwise use
* delayed write.
*/
if (flags & B_SYNC) {
bwrite(bp);
} else {
bdwrite(bp);
}
if (bpp != NULL) {
nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0);
nbp->b_blkno = fsbtodb(fs, nb);
if (flags & B_CLRBUF)
clrbuf(nbp);
*bpp = nbp;
}
return (0);
}
brelse(bp);
if (bpp != NULL) {
if (flags & B_CLRBUF) {
error = bread(vp, lbn, (int)fs->e2fs_bsize, NOCRED,
&nbp);
if (error) {
brelse(nbp);
goto fail;
}
} else {
nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0);
nbp->b_blkno = fsbtodb(fs, nb);
}
*bpp = nbp;
}
return (0);
fail:
/*
* If we have failed part way through block allocation, we
* have to deallocate any indirect blocks that we have allocated.
*/
for (deallocated = 0, blkp = allociblk; blkp < allocblk; blkp++) {
ext2fs_blkfree(ip, *blkp);
deallocated += fs->e2fs_bsize;
}
if (unwindidx >= 0) {
if (unwindidx == 0) {
*allocib = 0;
} else {
int r;
r = bread(vp, indirs[unwindidx].in_lbn,
(int)fs->e2fs_bsize, NOCRED, &bp);
if (r) {
panic("Could not unwind indirect block, error %d", r);
brelse(bp);
} else {
bap = (ufs_daddr_t *)bp->b_data;
bap[indirs[unwindidx].in_off] = 0;
if (flags & B_SYNC)
bwrite(bp);
else
bdwrite(bp);
}
}
for (i = unwindidx + 1; i <= num; i++) {
bp = getblk(vp, indirs[i].in_lbn, (int)fs->e2fs_bsize,
0, 0);
bp->b_flags |= B_INVAL;
brelse(bp);
}
}
if (deallocated) {
ip->i_e2fs_nblock -= btodb(deallocated);
ip->i_e2fs_flags |= IN_CHANGE | IN_UPDATE;
}
return error;
}
int
ext2fs_gop_alloc(struct vnode *vp, off_t off, off_t len, int flags,
struct ucred *cred)
{
struct inode *ip = VTOI(vp);
struct m_ext2fs *fs = ip->i_e2fs;
int error, delta, bshift, bsize;
UVMHIST_FUNC("ext2fs_gop_alloc"); UVMHIST_CALLED(ubchist);
bshift = fs->e2fs_bshift;
bsize = 1 << bshift;
delta = off & (bsize - 1);
off -= delta;
len += delta;
while (len > 0) {
bsize = min(bsize, len);
UVMHIST_LOG(ubchist, "off 0x%x len 0x%x bsize 0x%x",
off, len, bsize, 0);
error = ext2fs_balloc(ip, lblkno(fs, off), bsize, cred,
NULL, flags);
if (error) {
UVMHIST_LOG(ubchist, "error %d", error, 0,0,0);
return error;
}
/*
* increase file size now, VOP_BALLOC() requires that
* EOF be up-to-date before each call.
*/
if (ip->i_e2fs_size < off + bsize) {
UVMHIST_LOG(ubchist, "old 0x%x new 0x%x",
ip->i_e2fs_size, off + bsize,0,0);
ip->i_e2fs_size = off + bsize;
}
off += bsize;
len -= bsize;
}
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
ext2fs_balloc_range(vp, off, len, cred, flags)
struct vnode *vp;
off_t off, len;
struct ucred *cred;
int flags;
{
off_t oldeof, eof, pagestart;
struct genfs_node *gp = VTOG(vp);
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[ppb];
UVMHIST_FUNC("ext2fs_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);
oldeof = vp->v_size;
eof = MAX(oldeof, off + len);
UVMHIST_LOG(ubchist, "new eof 0x%x", eof,0,0,0);
pgs[0] = NULL;
/*
* cache the new range of the file. this will create zeroed pages
* where the new block will be and keep them locked until the
* new block is allocated, so there will be no window where
* the old contents of the new block is visible to racing threads.
*/
pagestart = trunc_page(off) & ~(bsize - 1);
npages = MIN(ppb, (round_page(eof) - pagestart) >> PAGE_SHIFT);
memset(pgs, 0, npages * sizeof(struct vm_page *));
simple_lock(&vp->v_interlock);
error = VOP_GETPAGES(vp, pagestart, pgs, &npages, 0,
VM_PROT_READ, 0, PGO_SYNCIO | PGO_PASTEOF);
if (error) {
return error;
}
for (i = 0; i < npages; i++) {
UVMHIST_LOG(ubchist, "got pgs[%d] %p", i, pgs[i],0,0);
KASSERT((pgs[i]->flags & PG_RELEASED) == 0);
pgs[i]->flags &= ~PG_CLEAN;
uvm_pageactivate(pgs[i]);
}
/*
* adjust off to be block-aligned.
*/
delta = off & (bsize - 1);
off -= delta;
len += delta;
/*
* now allocate the range.
*/
lockmgr(&gp->g_glock, LK_EXCLUSIVE, NULL);
error = GOP_ALLOC(vp, off, len, flags, cred);
UVMHIST_LOG(ubchist, "alloc %d", error,0,0,0);
lockmgr(&gp->g_glock, LK_RELEASE, NULL);
/*
* clear PG_RDONLY on any pages we are holding
* (since they now have backing store) and unbusy them.
* if we got an error, free any pages we created past the old eob.
*/
simple_lock(&vp->v_interlock);
for (i = 0; i < npages; i++) {
pgs[i]->flags &= ~PG_RDONLY;
if (error) {
pgs[i]->flags |= PG_RELEASED;
}
}
if (error) {
uvm_lock_pageq();
uvm_page_unbusy(pgs, npages);
uvm_unlock_pageq();
} else {
uvm_page_unbusy(pgs, npages);
}
simple_unlock(&vp->v_interlock);
return (error);
}
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