/* $NetBSD: ffs_balloc.c,v 1.14 1999/03/24 05:51:30 mrg Exp $ */ /* * 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 */ #if defined(_KERNEL) && !defined(_LKM) #include "opt_quota.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * 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_ffs_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_ffs_db[0]), osize, (int)fs->fs_bsize, cred, &bp); if (error) return (error); ip->i_ffs_size = (nb + 1) * fs->fs_bsize; uvm_vnp_setsize(vp, ip->i_ffs_size); ip->i_ffs_db[nb] = ufs_rw32(dbtofsb(fs, bp->b_blkno), UFS_MPNEEDSWAP(vp->v_mount)); 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 = ufs_rw32(ip->i_ffs_db[lbn], UFS_MPNEEDSWAP(vp->v_mount)); if (nb != 0 && ip->i_ffs_size >= (lbn + 1) * fs->fs_bsize) { error = bread(vp, lbn, fs->fs_bsize, NOCRED, &bp); if (error) { brelse(bp); return (error); } *bpp = bp; return (0); } if (nb != 0) { /* * Consider need to reallocate a fragment. */ osize = fragroundup(fs, blkoff(fs, ip->i_ffs_size)); nsize = fragroundup(fs, size); if (nsize <= osize) { error = bread(vp, lbn, osize, NOCRED, &bp); if (error) { brelse(bp); return (error); } } else { error = ffs_realloccg(ip, lbn, ffs_blkpref(ip, lbn, (int)lbn, &ip->i_ffs_db[0]), osize, nsize, cred, &bp); if (error) return (error); } } else { if (ip->i_ffs_size < (lbn + 1) * fs->fs_bsize) nsize = fragroundup(fs, size); else nsize = fs->fs_bsize; error = ffs_alloc(ip, lbn, ffs_blkpref(ip, lbn, (int)lbn, &ip->i_ffs_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) clrbuf(bp); } ip->i_ffs_db[lbn] = ufs_rw32(dbtofsb(fs, bp->b_blkno), UFS_MPNEEDSWAP(vp->v_mount)); 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)) != 0) return(error); #ifdef DIAGNOSTIC if (num < 1) panic ("ffs_balloc: ufs_bmaparray returned indirect block\n"); #endif /* * Fetch the first indirect block allocating if necessary. */ --num; nb = ufs_rw32(ip->i_ffs_ib[indirs[0].in_off], UFS_MPNEEDSWAP(vp->v_mount)); allocib = NULL; allocblk = allociblk; if (nb == 0) { pref = ffs_blkpref(ip, lbn, 0, (ufs_daddr_t *)0); error = ffs_alloc(ip, lbn, pref, (int)fs->fs_bsize, cred, &newb); if (error) return (error); nb = newb; *allocblk++ = nb; bp = getblk(vp, indirs[1].in_lbn, fs->fs_bsize, 0, 0); bp->b_blkno = fsbtodb(fs, nb); clrbuf(bp); /* * Write synchronously so that indirect blocks * never point at garbage. */ if ((error = bwrite(bp)) != 0) goto fail; allocib = &ip->i_ffs_ib[indirs[0].in_off]; *allocib = ufs_rw32(nb, UFS_MPNEEDSWAP(vp->v_mount)); 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 = ufs_rw32(bap[indirs[i].in_off], UFS_MPNEEDSWAP(vp->v_mount)); if (i == num) break; i += 1; if (nb != 0) { brelse(bp); continue; } if (pref == 0) pref = ffs_blkpref(ip, lbn, 0, (ufs_daddr_t *)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, indirs[i].in_lbn, fs->fs_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; } bap[indirs[i - 1].in_off] = ufs_rw32(nb, UFS_MPNEEDSWAP(vp->v_mount)); /* * 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) clrbuf(nbp); bap[indirs[i].in_off] = ufs_rw32(nb, UFS_MPNEEDSWAP(vp->v_mount)); /* * 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_ffs_blocks -= btodb(deallocated); ip->i_flag |= IN_CHANGE | IN_UPDATE; } return (error); }