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/* $OpenBSD: lfs_balloc.c,v 1.9 2003/06/02 23:28:23 millert Exp $ */
/* $NetBSD: lfs_balloc.c,v 1.3 1996/02/09 22:28:48 christos Exp $ */
/*
* Copyright (c) 1989, 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. 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_balloc.c 8.4 (Berkeley) 5/8/95
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/buf.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/resourcevar.h>
#include <sys/trace.h>
#include <miscfs/specfs/specdev.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>
#include <uvm/uvm_extern.h>
int lfs_fragextend(struct vnode *vp, int osize, int nsize, daddr_t lbn,
struct buf **bpp);
int
lfs_balloc(vp, offset, iosize, lbn, bpp)
struct vnode *vp;
int offset;
u_long iosize;
ufs_daddr_t lbn;
struct buf **bpp;
{
struct buf *ibp, *bp;
struct inode *ip;
struct lfs *fs;
struct indir indirs[NIADDR+2];
ufs_daddr_t daddr, lastblock;
int bb; /* number of disk blocks in a block disk blocks */
int error, frags, i, nsize, osize, num;
ip = VTOI(vp);
fs = ip->i_lfs;
/*
* Three cases: it's a block beyond the end of file, it's a block in
* the file that may or may not have been assigned a disk address or
* we're writing an entire block. Note, if the daddr is unassigned,
* the block might still have existed in the cache (if it was read
* or written earlier). If it did, make sure we don't count it as a
* new block or zero out its contents. If it did not, make sure
* we allocate any necessary indirect blocks.
* If we are writing a block beyond the end of the file, we need to
* check if the old last block was a fragment. If it was, we need
* to rewrite it.
*/
*bpp = NULL;
error = ufs_bmaparray(vp, lbn, &daddr, &indirs[0], &num, NULL);
if (error)
return (error);
/* Check for block beyond end of file and fragment extension needed. */
lastblock = lblkno(fs, ip->i_size);
if (lastblock < NDADDR && lastblock < lbn) {
osize = blksize(fs, ip, lastblock);
if (osize < fs->lfs_bsize && osize > 0) {
error = lfs_fragextend(vp, osize, fs->lfs_bsize,
lastblock, &bp);
if (error != 0)
return(error);
ip->i_size = (lastblock + 1) * fs->lfs_bsize;
vnode_pager_setsize(vp, (u_long)ip->i_size);
ip->i_flag |= IN_CHANGE | IN_UPDATE;
VOP_BWRITE(bp);
}
}
bb = VFSTOUFS(vp->v_mount)->um_seqinc;
if (daddr == UNASSIGNED)
/* May need to allocate indirect blocks */
for (i = 1; i < num; ++i)
if (!indirs[i].in_exists) {
ibp = getblk(vp, indirs[i].in_lbn, fs->lfs_bsize,
0, 0);
if ((ibp->b_flags & (B_DONE | B_DELWRI)))
panic ("Indirect block should not exist");
if (!ISSPACE(fs, bb, curproc->p_ucred)){
ibp->b_flags |= B_INVAL;
brelse(ibp);
return(ENOSPC);
} else {
ip->i_ffs_blocks += bb;
ip->i_lfs->lfs_bfree -= bb;
clrbuf(ibp);
if((error = VOP_BWRITE(ibp)) != 0)
return(error);
}
}
/*
* If the block we are writing is a direct block, it's the last
* block in the file, and offset + iosize is less than a full
* block, we can write one or more fragments. There are two cases:
* the block is brand new and we should allocate it the correct
* size or it already exists and contains some fragments and
* may need to extend it.
*/
if (lbn < NDADDR && lblkno(fs, ip->i_size) == lbn) {
nsize = fragroundup(fs, offset + iosize);
frags = numfrags(fs, nsize);
bb = fragstodb(fs, frags);
if (lblktosize(fs, lbn) == ip->i_size)
/* Brand new block or fragment */
*bpp = bp = getblk(vp, lbn, nsize, 0, 0);
else {
/* Extend existing block */
error = lfs_fragextend(vp, (int)blksize(fs, ip, lbn),
nsize, lbn, &bp);
if (error != 0)
return(error);
*bpp = bp;
}
} else {
/*
* Get the existing block from the cache either because the
* block is 1) not a direct block or because it's not the last
* block in the file.
*/
frags = dbtofrags(fs, bb);
*bpp = bp = getblk(vp, lbn, blksize(fs, ip, lbn), 0, 0);
}
/*
* The block we are writing may be a brand new block
* in which case we need to do accounting (i.e. check
* for free space and update the inode number of blocks.
*/
if (!(bp->b_flags & (B_CACHE | B_DONE | B_DELWRI))) {
if (daddr == UNASSIGNED)
if (!ISSPACE(fs, bb, curproc->p_ucred)) {
bp->b_flags |= B_INVAL;
brelse(bp);
return(ENOSPC);
} else {
ip->i_ffs_blocks += bb;
ip->i_lfs->lfs_bfree -= bb;
if (iosize != fs->lfs_bsize)
clrbuf(bp);
}
else if (iosize == fs->lfs_bsize)
/* Optimization: I/O is unnecessary. */
bp->b_blkno = daddr;
else {
/*
* We need to read the block to preserve the
* existing bytes.
*/
bp->b_blkno = daddr;
bp->b_flags |= B_READ;
VOP_STRATEGY(bp);
return(biowait(bp));
}
}
return (0);
}
int
lfs_fragextend(vp, osize, nsize, lbn, bpp)
struct vnode *vp;
int osize;
int nsize;
daddr_t lbn;
struct buf **bpp;
{
struct inode *ip;
struct lfs *fs;
long bb;
int error;
ip = VTOI(vp);
fs = ip->i_lfs;
bb = (long)fragstodb(fs, numfrags(fs, nsize - osize));
if (!ISSPACE(fs, bb, curproc->p_ucred)) {
return(ENOSPC);
}
error = bread(vp, lbn, osize, NOCRED, bpp);
if (error != 0) {
brelse(*bpp);
return(error);
}
#ifdef QUOTA
error = chkdq(ip, bb, curproc->p_ucred, 0);
if (error != 0) {
brelse(*bpp);
return (error);
}
#endif
ip->i_ffs_blocks += bb;
ip->i_flag |= IN_CHANGE | IN_UPDATE;
fs->lfs_bfree -= fragstodb(fs, numfrags(fs, (nsize - osize)));
allocbuf(*bpp, nsize);
bzero((char *)((*bpp)->b_data) + osize, (u_int)(nsize - osize));
return(0);
}
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