308 lines
8.2 KiB
C
308 lines
8.2 KiB
C
/*
|
|
* 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 8.8 (Berkeley) 6/16/95
|
|
* $Id: ffs_balloc.c,v 1.14 1997/04/10 13:17:09 bde Exp $
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/buf.h>
|
|
#include <sys/vnode.h>
|
|
|
|
#include <ufs/ufs/quota.h>
|
|
#include <ufs/ufs/inode.h>
|
|
#include <ufs/ufs/ufs_extern.h>
|
|
|
|
#include <ufs/ffs/fs.h>
|
|
#include <ufs/ffs/ffs_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
|
|
ffs_balloc(ip, lbn, size, cred, bpp, flags)
|
|
register struct inode *ip;
|
|
register ufs_daddr_t lbn;
|
|
int size;
|
|
struct ucred *cred;
|
|
struct buf **bpp;
|
|
int flags;
|
|
{
|
|
register struct fs *fs;
|
|
register ufs_daddr_t nb;
|
|
struct buf *bp, *nbp;
|
|
struct vnode *vp = ITOV(ip);
|
|
struct indir indirs[NIADDR + 2];
|
|
ufs_daddr_t newb, *bap, pref;
|
|
int deallocated, osize, nsize, num, i, error;
|
|
ufs_daddr_t *allocib, *blkp, *allocblk, allociblk[NIADDR + 1];
|
|
|
|
*bpp = NULL;
|
|
if (lbn < 0)
|
|
return (EFBIG);
|
|
fs = ip->i_fs;
|
|
|
|
/*
|
|
* If the next write will extend the file into a new block,
|
|
* and the file is currently composed of a fragment
|
|
* this fragment has to be extended to be a full block.
|
|
*/
|
|
nb = lblkno(fs, ip->i_size);
|
|
if (nb < NDADDR && nb < lbn) {
|
|
osize = blksize(fs, ip, nb);
|
|
if (osize < fs->fs_bsize && osize > 0) {
|
|
error = ffs_realloccg(ip, nb,
|
|
ffs_blkpref(ip, nb, (int)nb, &ip->i_db[0]),
|
|
osize, (int)fs->fs_bsize, cred, &bp);
|
|
if (error)
|
|
return (error);
|
|
ip->i_size = smalllblktosize(fs, nb + 1);
|
|
ip->i_db[nb] = dbtofsb(fs, bp->b_blkno);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
if (flags & B_SYNC)
|
|
bwrite(bp);
|
|
else
|
|
bawrite(bp);
|
|
}
|
|
}
|
|
/*
|
|
* The first NDADDR blocks are direct blocks
|
|
*/
|
|
if (lbn < NDADDR) {
|
|
nb = ip->i_db[lbn];
|
|
if (nb != 0 && ip->i_size >= smalllblktosize(fs, lbn + 1)) {
|
|
error = bread(vp, lbn, fs->fs_bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
bp->b_blkno = fsbtodb(fs, nb);
|
|
*bpp = bp;
|
|
return (0);
|
|
}
|
|
if (nb != 0) {
|
|
/*
|
|
* Consider need to reallocate a fragment.
|
|
*/
|
|
osize = fragroundup(fs, blkoff(fs, ip->i_size));
|
|
nsize = fragroundup(fs, size);
|
|
if (nsize <= osize) {
|
|
error = bread(vp, lbn, osize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
return (error);
|
|
}
|
|
bp->b_blkno = fsbtodb(fs, nb);
|
|
} else {
|
|
error = ffs_realloccg(ip, lbn,
|
|
ffs_blkpref(ip, lbn, (int)lbn,
|
|
&ip->i_db[0]), osize, nsize, cred, &bp);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
} else {
|
|
if (ip->i_size < smalllblktosize(fs, lbn + 1))
|
|
nsize = fragroundup(fs, size);
|
|
else
|
|
nsize = fs->fs_bsize;
|
|
error = ffs_alloc(ip, lbn,
|
|
ffs_blkpref(ip, lbn, (int)lbn, &ip->i_db[0]),
|
|
nsize, cred, &newb);
|
|
if (error)
|
|
return (error);
|
|
bp = getblk(vp, lbn, nsize, 0, 0);
|
|
bp->b_blkno = fsbtodb(fs, newb);
|
|
if (flags & B_CLRBUF)
|
|
vfs_bio_clrbuf(bp);
|
|
}
|
|
ip->i_db[lbn] = dbtofsb(fs, bp->b_blkno);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
*bpp = bp;
|
|
return (0);
|
|
}
|
|
/*
|
|
* Determine the number of levels of indirection.
|
|
*/
|
|
pref = 0;
|
|
if (error = ufs_getlbns(vp, lbn, indirs, &num))
|
|
return(error);
|
|
#ifdef DIAGNOSTIC
|
|
if (num < 1)
|
|
panic ("ffs_balloc: ufs_bmaparray returned indirect block");
|
|
#endif
|
|
/*
|
|
* Fetch the first indirect block allocating if necessary.
|
|
*/
|
|
--num;
|
|
nb = ip->i_ib[indirs[0].in_off];
|
|
allocib = NULL;
|
|
allocblk = allociblk;
|
|
if (nb == 0) {
|
|
pref = ffs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0);
|
|
if (error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize,
|
|
cred, &newb))
|
|
return (error);
|
|
nb = newb;
|
|
*allocblk++ = nb;
|
|
bp = getblk(vp, indirs[1].in_lbn, fs->fs_bsize, 0, 0);
|
|
bp->b_blkno = fsbtodb(fs, nb);
|
|
vfs_bio_clrbuf(bp);
|
|
/*
|
|
* Write synchronously so that indirect blocks
|
|
* never point at garbage.
|
|
*/
|
|
if (error = bwrite(bp))
|
|
goto fail;
|
|
allocib = &ip->i_ib[indirs[0].in_off];
|
|
*allocib = nb;
|
|
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->fs_bsize, NOCRED, &bp);
|
|
if (error) {
|
|
brelse(bp);
|
|
goto fail;
|
|
}
|
|
bap = (ufs_daddr_t *)bp->b_data;
|
|
nb = bap[indirs[i].in_off];
|
|
if (i == num)
|
|
break;
|
|
i += 1;
|
|
if (nb != 0) {
|
|
bqrelse(bp);
|
|
continue;
|
|
}
|
|
if (pref == 0)
|
|
pref = ffs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0);
|
|
if (error =
|
|
ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, cred, &newb)) {
|
|
brelse(bp);
|
|
goto fail;
|
|
}
|
|
nb = newb;
|
|
*allocblk++ = nb;
|
|
nbp = getblk(vp, indirs[i].in_lbn, fs->fs_bsize, 0, 0);
|
|
nbp->b_blkno = fsbtodb(fs, nb);
|
|
vfs_bio_clrbuf(nbp);
|
|
/*
|
|
* Write synchronously so that indirect blocks
|
|
* never point at garbage.
|
|
*/
|
|
if (error = bwrite(nbp)) {
|
|
brelse(bp);
|
|
goto fail;
|
|
}
|
|
bap[indirs[i - 1].in_off] = 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 = ffs_blkpref(ip, lbn, indirs[i].in_off, &bap[0]);
|
|
error = ffs_alloc(ip,
|
|
lbn, pref, (int)fs->fs_bsize, cred, &newb);
|
|
if (error) {
|
|
brelse(bp);
|
|
goto fail;
|
|
}
|
|
nb = newb;
|
|
*allocblk++ = nb;
|
|
nbp = getblk(vp, lbn, fs->fs_bsize, 0, 0);
|
|
nbp->b_blkno = fsbtodb(fs, nb);
|
|
if (flags & B_CLRBUF)
|
|
vfs_bio_clrbuf(nbp);
|
|
bap[indirs[i].in_off] = nb;
|
|
/*
|
|
* If required, write synchronously, otherwise use
|
|
* delayed write.
|
|
*/
|
|
if (flags & B_SYNC) {
|
|
bwrite(bp);
|
|
} else {
|
|
bdwrite(bp);
|
|
}
|
|
*bpp = nbp;
|
|
return (0);
|
|
}
|
|
brelse(bp);
|
|
if (flags & B_CLRBUF) {
|
|
error = bread(vp, lbn, (int)fs->fs_bsize, NOCRED, &nbp);
|
|
if (error) {
|
|
brelse(nbp);
|
|
goto fail;
|
|
}
|
|
} else {
|
|
nbp = getblk(vp, lbn, fs->fs_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++) {
|
|
ffs_blkfree(ip, *blkp, fs->fs_bsize);
|
|
deallocated += fs->fs_bsize;
|
|
}
|
|
if (allocib != NULL)
|
|
*allocib = 0;
|
|
if (deallocated) {
|
|
#ifdef QUOTA
|
|
/*
|
|
* Restore user's disk quota because allocation failed.
|
|
*/
|
|
(void) chkdq(ip, (long)-btodb(deallocated), cred, FORCE);
|
|
#endif
|
|
ip->i_blocks -= btodb(deallocated);
|
|
ip->i_flag |= IN_CHANGE | IN_UPDATE;
|
|
}
|
|
return (error);
|
|
}
|