/* $OpenBSD: ffs_vnops.c,v 1.77 2014/07/08 17:19:26 deraadt Exp $ */ /* $NetBSD: ffs_vnops.c,v 1.7 1996/05/11 18:27:24 mycroft 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_vnops.c 8.10 (Berkeley) 8/10/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct vops ffs_vops = { .vop_lookup = ufs_lookup, .vop_create = ufs_create, .vop_mknod = ufs_mknod, .vop_open = ufs_open, .vop_close = ufs_close, .vop_access = ufs_access, .vop_getattr = ufs_getattr, .vop_setattr = ufs_setattr, .vop_read = ffs_read, .vop_write = ffs_write, .vop_ioctl = ufs_ioctl, .vop_poll = ufs_poll, .vop_kqfilter = ufs_kqfilter, .vop_revoke = vop_generic_revoke, .vop_fsync = ffs_fsync, .vop_remove = ufs_remove, .vop_link = ufs_link, .vop_rename = ufs_rename, .vop_mkdir = ufs_mkdir, .vop_rmdir = ufs_rmdir, .vop_symlink = ufs_symlink, .vop_readdir = ufs_readdir, .vop_readlink = ufs_readlink, .vop_abortop = vop_generic_abortop, .vop_inactive = ufs_inactive, .vop_reclaim = ffs_reclaim, .vop_lock = ufs_lock, .vop_unlock = ufs_unlock, .vop_bmap = ufs_bmap, .vop_strategy = ufs_strategy, .vop_print = ufs_print, .vop_islocked = ufs_islocked, .vop_pathconf = ufs_pathconf, .vop_advlock = ufs_advlock, .vop_reallocblks = ffs_reallocblks, .vop_bwrite = vop_generic_bwrite }; struct vops ffs_specvops = { .vop_close = ufsspec_close, .vop_access = ufs_access, .vop_getattr = ufs_getattr, .vop_setattr = ufs_setattr, .vop_read = ufsspec_read, .vop_write = ufsspec_write, .vop_fsync = ffs_fsync, .vop_inactive = ufs_inactive, .vop_reclaim = ffs_reclaim, .vop_lock = ufs_lock, .vop_unlock = ufs_unlock, .vop_print = ufs_print, .vop_islocked = ufs_islocked, /* XXX: Keep in sync with spec_vops */ .vop_lookup = vop_generic_lookup, .vop_create = spec_badop, .vop_mknod = spec_badop, .vop_open = spec_open, .vop_ioctl = spec_ioctl, .vop_poll = spec_poll, .vop_kqfilter = spec_kqfilter, .vop_revoke = vop_generic_revoke, .vop_remove = spec_badop, .vop_link = spec_badop, .vop_rename = spec_badop, .vop_mkdir = spec_badop, .vop_rmdir = spec_badop, .vop_symlink = spec_badop, .vop_readdir = spec_badop, .vop_readlink = spec_badop, .vop_abortop = spec_badop, .vop_bmap = vop_generic_bmap, .vop_strategy = spec_strategy, .vop_pathconf = spec_pathconf, .vop_advlock = spec_advlock, .vop_bwrite = vop_generic_bwrite, }; #ifdef FIFO struct vops ffs_fifovops = { .vop_close = ufsfifo_close, .vop_access = ufs_access, .vop_getattr = ufs_getattr, .vop_setattr = ufs_setattr, .vop_read = ufsfifo_read, .vop_write = ufsfifo_write, .vop_fsync = ffs_fsync, .vop_inactive = ufs_inactive, .vop_reclaim = ffsfifo_reclaim, .vop_lock = ufs_lock, .vop_unlock = ufs_unlock, .vop_print = ufs_print, .vop_islocked = ufs_islocked, .vop_bwrite = vop_generic_bwrite, /* XXX: Keep in sync with fifo_vops */ .vop_lookup = vop_generic_lookup, .vop_create = fifo_badop, .vop_mknod = fifo_badop, .vop_open = fifo_open, .vop_ioctl = fifo_ioctl, .vop_poll = fifo_poll, .vop_kqfilter = fifo_kqfilter, .vop_revoke = vop_generic_revoke, .vop_remove = fifo_badop, .vop_link = fifo_badop, .vop_rename = fifo_badop, .vop_mkdir = fifo_badop, .vop_rmdir = fifo_badop, .vop_symlink = fifo_badop, .vop_readdir = fifo_badop, .vop_readlink = fifo_badop, .vop_abortop = fifo_badop, .vop_bmap = vop_generic_bmap, .vop_strategy = fifo_badop, .vop_pathconf = fifo_pathconf, .vop_advlock = fifo_advlock }; #endif /* FIFO */ /* * Enabling cluster read/write operations. */ int doclusterread = 1; int doclusterwrite = 1; /* * Vnode op for reading. */ int ffs_read(void *v) { struct vop_read_args *ap = v; struct vnode *vp; struct inode *ip; struct uio *uio; struct fs *fs; struct buf *bp; daddr_t lbn, nextlbn; off_t bytesinfile; long size, xfersize, blkoffset; mode_t mode; int error; vp = ap->a_vp; ip = VTOI(vp); mode = DIP(ip, mode); uio = ap->a_uio; #ifdef DIAGNOSTIC if (uio->uio_rw != UIO_READ) panic("ffs_read: mode"); if (vp->v_type == VLNK) { if ((int)DIP(ip, size) < vp->v_mount->mnt_maxsymlinklen || (vp->v_mount->mnt_maxsymlinklen == 0 && DIP(ip, blocks) == 0)) panic("ffs_read: short symlink"); } else if (vp->v_type != VREG && vp->v_type != VDIR) panic("ffs_read: type %d", vp->v_type); #endif fs = ip->i_fs; if ((u_int64_t)uio->uio_offset > fs->fs_maxfilesize) return (EFBIG); if (uio->uio_resid == 0) return (0); for (error = 0, bp = NULL; uio->uio_resid > 0; bp = NULL) { if ((bytesinfile = DIP(ip, size) - uio->uio_offset) <= 0) break; lbn = lblkno(fs, uio->uio_offset); nextlbn = lbn + 1; size = fs->fs_bsize; /* WAS blksize(fs, ip, lbn); */ blkoffset = blkoff(fs, uio->uio_offset); xfersize = fs->fs_bsize - blkoffset; if (uio->uio_resid < xfersize) xfersize = uio->uio_resid; if (bytesinfile < xfersize) xfersize = bytesinfile; if (lblktosize(fs, nextlbn) >= DIP(ip, size)) error = bread(vp, lbn, size, &bp); else if (lbn - 1 == ip->i_ci.ci_lastr) { error = bread_cluster(vp, lbn, size, &bp); } else error = bread(vp, lbn, size, &bp); if (error) break; ip->i_ci.ci_lastr = lbn; /* * We should only get non-zero b_resid when an I/O error * has occurred, which should cause us to break above. * However, if the short read did not cause an error, * then we want to ensure that we do not uiomove bad * or uninitialized data. */ size -= bp->b_resid; if (size < xfersize) { if (size == 0) break; xfersize = size; } error = uiomove(bp->b_data + blkoffset, (int)xfersize, uio); if (error) break; brelse(bp); } if (bp != NULL) brelse(bp); if (!(vp->v_mount->mnt_flag & MNT_NOATIME) || (ip->i_flag & (IN_CHANGE | IN_UPDATE))) { ip->i_flag |= IN_ACCESS; } return (error); } /* * Vnode op for writing. */ int ffs_write(void *v) { struct vop_write_args *ap = v; struct vnode *vp; struct uio *uio; struct inode *ip; struct fs *fs; struct buf *bp; daddr_t lbn; off_t osize; int blkoffset, error, extended, flags, ioflag, size, xfersize; ssize_t resid, overrun; extended = 0; ioflag = ap->a_ioflag; uio = ap->a_uio; vp = ap->a_vp; ip = VTOI(vp); #ifdef DIAGNOSTIC if (uio->uio_rw != UIO_WRITE) panic("ffs_write: mode"); #endif /* * If writing 0 bytes, succeed and do not change * update time or file offset (standards compliance) */ if (uio->uio_resid == 0) return (0); switch (vp->v_type) { case VREG: if (ioflag & IO_APPEND) uio->uio_offset = DIP(ip, size); if ((DIP(ip, flags) & APPEND) && uio->uio_offset != DIP(ip, size)) return (EPERM); /* FALLTHROUGH */ case VLNK: break; case VDIR: if ((ioflag & IO_SYNC) == 0) panic("ffs_write: nonsync dir write"); break; default: panic("ffs_write: type"); } fs = ip->i_fs; if (uio->uio_offset < 0 || (u_int64_t)uio->uio_offset + uio->uio_resid > fs->fs_maxfilesize) return (EFBIG); /* do the filesize rlimit check */ if ((error = vn_fsizechk(vp, uio, ioflag, &overrun))) return (error); resid = uio->uio_resid; osize = DIP(ip, size); flags = ioflag & IO_SYNC ? B_SYNC : 0; for (error = 0; uio->uio_resid > 0;) { lbn = lblkno(fs, uio->uio_offset); blkoffset = blkoff(fs, uio->uio_offset); xfersize = fs->fs_bsize - blkoffset; if (uio->uio_resid < xfersize) xfersize = uio->uio_resid; if (fs->fs_bsize > xfersize) flags |= B_CLRBUF; else flags &= ~B_CLRBUF; if ((error = UFS_BUF_ALLOC(ip, uio->uio_offset, xfersize, ap->a_cred, flags, &bp)) != 0) break; if (uio->uio_offset + xfersize > DIP(ip, size)) { DIP_ASSIGN(ip, size, uio->uio_offset + xfersize); uvm_vnp_setsize(vp, DIP(ip, size)); extended = 1; } (void)uvm_vnp_uncache(vp); size = blksize(fs, ip, lbn) - bp->b_resid; if (size < xfersize) xfersize = size; error = uiomove(bp->b_data + blkoffset, xfersize, uio); if (error != 0) memset(bp->b_data + blkoffset, 0, xfersize); #if 0 if (ioflag & IO_NOCACHE) bp->b_flags |= B_NOCACHE; #endif if (ioflag & IO_SYNC) (void)bwrite(bp); else if (xfersize + blkoffset == fs->fs_bsize) { if (doclusterwrite) cluster_write(bp, &ip->i_ci, DIP(ip, size)); else bawrite(bp); } else bdwrite(bp); if (error || xfersize == 0) break; ip->i_flag |= IN_CHANGE | IN_UPDATE; } /* * If we successfully wrote any data, and we are not the superuser * we clear the setuid and setgid bits as a precaution against * tampering. */ if (resid > uio->uio_resid && ap->a_cred && ap->a_cred->cr_uid != 0) DIP_ASSIGN(ip, mode, DIP(ip, mode) & ~(ISUID | ISGID)); if (resid > uio->uio_resid) VN_KNOTE(vp, NOTE_WRITE | (extended ? NOTE_EXTEND : 0)); if (error) { if (ioflag & IO_UNIT) { (void)UFS_TRUNCATE(ip, osize, ioflag & IO_SYNC, ap->a_cred); uio->uio_offset -= resid - uio->uio_resid; uio->uio_resid = resid; } } else if (resid > uio->uio_resid && (ioflag & IO_SYNC)) { error = UFS_UPDATE(ip, 1); } /* correct the result for writes clamped by vn_fsizechk() */ uio->uio_resid += overrun; return (error); } /* * Synch an open file. */ int ffs_fsync(void *v) { struct vop_fsync_args *ap = v; struct vnode *vp = ap->a_vp; struct buf *bp, *nbp; int s, error, passes, skipmeta; if (vp->v_type == VBLK && vp->v_specmountpoint != NULL && (vp->v_specmountpoint->mnt_flag & MNT_SOFTDEP)) softdep_fsync_mountdev(vp, ap->a_waitfor); /* * Flush all dirty buffers associated with a vnode. */ passes = NIADDR + 1; skipmeta = 0; if (ap->a_waitfor == MNT_WAIT) skipmeta = 1; s = splbio(); loop: for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = LIST_NEXT(bp, b_vnbufs)) bp->b_flags &= ~B_SCANNED; for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); /* * Reasons to skip this buffer: it has already been considered * on this pass, this pass is the first time through on a * synchronous flush request and the buffer being considered * is metadata, the buffer has dependencies that will cause * it to be redirtied and it has not already been deferred, * or it is already being written. */ if (bp->b_flags & (B_BUSY | B_SCANNED)) continue; if ((bp->b_flags & B_DELWRI) == 0) panic("ffs_fsync: not dirty"); if (skipmeta && bp->b_lblkno < 0) continue; if (ap->a_waitfor != MNT_WAIT && LIST_FIRST(&bp->b_dep) != NULL && (bp->b_flags & B_DEFERRED) == 0 && buf_countdeps(bp, 0, 1)) { bp->b_flags |= B_DEFERRED; continue; } bremfree(bp); buf_acquire(bp); bp->b_flags |= B_SCANNED; splx(s); /* * On our final pass through, do all I/O synchronously * so that we can find out if our flush is failing * because of write errors. */ if (passes > 0 || ap->a_waitfor != MNT_WAIT) (void) bawrite(bp); else if ((error = bwrite(bp)) != 0) return (error); s = splbio(); /* * Since we may have slept during the I/O, we need * to start from a known point. */ nbp = LIST_FIRST(&vp->v_dirtyblkhd); } if (skipmeta) { skipmeta = 0; goto loop; } if (ap->a_waitfor == MNT_WAIT) { vwaitforio(vp, 0, "ffs_fsync", 0); /* * Ensure that any filesystem metadata associated * with the vnode has been written. */ splx(s); if ((error = softdep_sync_metadata(ap)) != 0) return (error); s = splbio(); if (!LIST_EMPTY(&vp->v_dirtyblkhd)) { /* * Block devices associated with filesystems may * have new I/O requests posted for them even if * the vnode is locked, so no amount of trying will * get them clean. Thus we give block devices a * good effort, then just give up. For all other file * types, go around and try again until it is clean. */ if (passes > 0) { passes -= 1; goto loop; } #ifdef DIAGNOSTIC if (vp->v_type != VBLK) vprint("ffs_fsync: dirty", vp); #endif } } splx(s); return (UFS_UPDATE(VTOI(vp), ap->a_waitfor == MNT_WAIT)); } /* * Reclaim an inode so that it can be used for other purposes. */ int ffs_reclaim(void *v) { struct vop_reclaim_args *ap = v; struct vnode *vp = ap->a_vp; struct inode *ip = VTOI(vp); int error; if ((error = ufs_reclaim(vp, ap->a_p)) != 0) return (error); if (ip->i_din1 != NULL) { #ifdef FFS2 if (ip->i_ump->um_fstype == UM_UFS2) pool_put(&ffs_dinode2_pool, ip->i_din2); else #endif pool_put(&ffs_dinode1_pool, ip->i_din1); } pool_put(&ffs_ino_pool, ip); vp->v_data = NULL; return (0); } #ifdef FIFO int ffsfifo_reclaim(void *v) { fifo_reclaim(v); return (ffs_reclaim(v)); } #endif