/* $NetBSD: ext2fs_balloc.c,v 1.41 2016/08/13 07:40:10 christos 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. 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. */ /* * Copyright (c) 1997 Manuel Bouyer. * * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __KERNEL_RCSID(0, "$NetBSD: ext2fs_balloc.c,v 1.41 2016/08/13 07:40:10 christos Exp $"); #if defined(_KERNEL_OPT) #include "opt_uvmhist.h" #endif #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 ext2fs_balloc(struct inode *ip, daddr_t bn, int size, kauth_cred_t cred, struct buf **bpp, int flags) { struct m_ext2fs *fs; daddr_t nb; struct buf *bp, *nbp; struct vnode *vp = ITOV(ip); struct indir indirs[EXT2FS_NIADDR + 2]; daddr_t newb, lbn, pref; int32_t *bap; /* XXX ondisk32 */ int num, i, error; u_int deallocated; daddr_t *blkp, *allocblk, allociblk[EXT2FS_NIADDR + 1]; int32_t *allocib; /* XXX ondisk32 */ 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 EXT2FS_NDADDR blocks are direct blocks */ if (bn < EXT2FS_NDADDR) { /* XXX ondisk32 */ 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, B_MODIFY, &bp); if (error) { 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; /* XXX ondisk32 */ ip->i_e2fs_blocks[bn] = h2fs32((int32_t)newb); ip->i_flag |= IN_CHANGE | IN_UPDATE; if (bpp != NULL) { bp = getblk(vp, bn, fs->e2fs_bsize, 0, 0); bp->b_blkno = EXT2_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("%s: ufs_getlbns returned indirect block\n", __func__); #endif /* * Fetch the first indirect block allocating if necessary. */ --num; /* XXX ondisk32 */ nb = fs2h32(ip->i_e2fs_blocks[EXT2FS_NDADDR + indirs[0].in_off]); allocib = NULL; allocblk = allociblk; if (nb == 0) { pref = ext2fs_blkpref(ip, lbn, 0, (int32_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 = EXT2_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[EXT2FS_NDADDR + indirs[0].in_off]; /* XXX ondisk32 */ *allocib = h2fs32((int32_t)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, 0, &bp); if (error) { goto fail; } bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ nb = fs2h32(bap[indirs[i].in_off]); if (i == num) break; i++; if (nb != 0) { brelse(bp, 0); continue; } pref = ext2fs_blkpref(ip, lbn, 0, (int32_t *)0); error = ext2fs_alloc(ip, lbn, pref, cred, &newb); if (error) { brelse(bp, 0); 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 = EXT2_FSBTODB(fs, nb); clrbuf(nbp); /* * Write synchronously so that indirect blocks * never point at garbage. */ if ((error = bwrite(nbp)) != 0) { brelse(bp, 0); goto fail; } if (unwindidx < 0) unwindidx = i - 1; /* XXX ondisk32 */ bap[indirs[i - 1].in_off] = h2fs32((int32_t)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, 0); goto fail; } nb = newb; *allocblk++ = nb; ip->i_e2fs_last_lblk = lbn; ip->i_e2fs_last_blk = newb; /* XXX ondisk32 */ bap[indirs[num].in_off] = h2fs32((int32_t)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 = EXT2_FSBTODB(fs, nb); if (flags & B_CLRBUF) clrbuf(nbp); *bpp = nbp; } return 0; } brelse(bp, 0); if (bpp != NULL) { if (flags & B_CLRBUF) { error = bread(vp, lbn, (int)fs->e2fs_bsize, B_MODIFY, &nbp); if (error) { goto fail; } } else { nbp = getblk(vp, lbn, fs->e2fs_bsize, 0, 0); nbp->b_blkno = EXT2_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, B_MODIFY, &bp); if (r) { panic("%s: Could not unwind indirect block, " "error %d", __func__, r); } else { bap = (int32_t *)bp->b_data; /* XXX ondisk32 */ 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); brelse(bp, BC_INVAL); } } if (deallocated) { ext2fs_setnblock(ip, ext2fs_nblock(ip) - 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, kauth_cred_t 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, ext2_lblkno(fs, off), bsize, cred, NULL, flags); if (error) { UVMHIST_LOG(ubchist, "error %d", error, 0, 0, 0); return error; } /* * increase file size now, ext2fs_balloc() requires that * EOF be up-to-date before each call. */ if (ext2fs_size(ip) < off + bsize) { UVMHIST_LOG(ubchist, "old 0x%lx%8lx new 0x%lx%8lx", /* Note that arguments are always cast to u_long. */ ext2fs_size(ip) >> 32, ext2fs_size(ip) & 0xffffffff, (off + bsize) >> 32, (off + bsize) & 0xffffffff); error = ext2fs_setsize(ip, off + bsize); if (error) { UVMHIST_LOG(ubchist, "error %d", error, 0, 0, 0); return error; } } off += bsize; len -= bsize; } return 0; }