/* $NetBSD: lfs_syscalls.c,v 1.9 1995/09/21 23:39:20 thorpej Exp $ */ /*- * Copyright (c) 1991, 1993, 1994 * 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. * * @(#)lfs_syscalls.c 8.6 (Berkeley) 6/16/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define BUMP_FIP(SP) \ (SP)->fip = (FINFO *) (&(SP)->fip->fi_blocks[(SP)->fip->fi_nblocks]) #define INC_FINFO(SP) ++((SEGSUM *)((SP)->segsum))->ss_nfinfo #define DEC_FINFO(SP) --((SEGSUM *)((SP)->segsum))->ss_nfinfo /* * Before committing to add something to a segment summary, make sure there * is enough room. S is the bytes added to the summary. */ #define CHECK_SEG(s) \ if (sp->sum_bytes_left < (s)) { \ (void) lfs_writeseg(fs, sp); \ } struct buf *lfs_fakebuf __P((struct vnode *, int, size_t, caddr_t)); /* * lfs_markv: * * This will mark inodes and blocks dirty, so they are written into the log. * It will block until all the blocks have been written. The segment create * time passed in the block_info and inode_info structures is used to decide * if the data is valid for each block (in case some process dirtied a block * or inode that is being cleaned between the determination that a block is * live and the lfs_markv call). * * 0 on success * -1/errno is return on error. */ int lfs_markv(p, v, retval) struct proc *p; void *v; register_t *retval; { struct lfs_markv_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct block_info *) blkiov; syscallarg(int) blkcnt; } */ *uap = v; struct segment *sp; BLOCK_INFO *blkp; IFILE *ifp; struct buf *bp, **bpp; struct inode *ip; struct lfs *fs; struct mount *mntp; struct vnode *vp; fsid_t fsid; void *start; ino_t lastino; daddr_t b_daddr, v_daddr; u_long bsize; int cnt, error; if (error = suser(p->p_ucred, &p->p_acflag)) return (error); if (error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) return (error); if ((mntp = getvfs(&fsid)) == NULL) return (EINVAL); cnt = SCARG(uap, blkcnt); start = malloc(cnt * sizeof(BLOCK_INFO), M_SEGMENT, M_WAITOK); if (error = copyin(SCARG(uap, blkiov), start, cnt * sizeof(BLOCK_INFO))) goto err1; /* Mark blocks/inodes dirty. */ fs = VFSTOUFS(mntp)->um_lfs; bsize = fs->lfs_bsize; error = 0; lfs_seglock(fs, SEGM_SYNC | SEGM_CLEAN); sp = fs->lfs_sp; for (v_daddr = LFS_UNUSED_DADDR, lastino = LFS_UNUSED_INUM, blkp = start; cnt--; ++blkp) { /* * Get the IFILE entry (only once) and see if the file still * exists. */ if (lastino != blkp->bi_inode) { if (lastino != LFS_UNUSED_INUM) { /* Finish up last file */ if (sp->fip->fi_nblocks == 0) { DEC_FINFO(sp); sp->sum_bytes_left += sizeof(FINFO) - sizeof(daddr_t); } else { lfs_updatemeta(sp); BUMP_FIP(sp); } lfs_writeinode(fs, sp, ip); lfs_vunref(vp); } /* Start a new file */ CHECK_SEG(sizeof(FINFO)); sp->sum_bytes_left -= sizeof(FINFO) - sizeof(daddr_t); INC_FINFO(sp); sp->start_lbp = &sp->fip->fi_blocks[0]; sp->vp = NULL; sp->fip->fi_version = blkp->bi_version; sp->fip->fi_nblocks = 0; sp->fip->fi_ino = blkp->bi_inode; lastino = blkp->bi_inode; if (blkp->bi_inode == LFS_IFILE_INUM) v_daddr = fs->lfs_idaddr; else { LFS_IENTRY(ifp, fs, blkp->bi_inode, bp); v_daddr = ifp->if_daddr; brelse(bp); } if (v_daddr == LFS_UNUSED_DADDR) continue; /* Get the vnode/inode. */ if (lfs_fastvget(mntp, blkp->bi_inode, v_daddr, &vp, blkp->bi_lbn == LFS_UNUSED_LBN ? blkp->bi_bp : NULL)) { #ifdef DIAGNOSTIC printf("lfs_markv: VFS_VGET failed (%d)\n", blkp->bi_inode); #endif lastino = LFS_UNUSED_INUM; v_daddr = LFS_UNUSED_DADDR; continue; } sp->vp = vp; ip = VTOI(vp); } else if (v_daddr == LFS_UNUSED_DADDR) continue; /* If this BLOCK_INFO didn't contain a block, keep going. */ if (blkp->bi_lbn == LFS_UNUSED_LBN) continue; if (VOP_BMAP(vp, blkp->bi_lbn, NULL, &b_daddr, NULL) || b_daddr != blkp->bi_daddr) continue; /* * If we got to here, then we are keeping the block. If it * is an indirect block, we want to actually put it in the * buffer cache so that it can be updated in the finish_meta * section. If it's not, we need to allocate a fake buffer * so that writeseg can perform the copyin and write the buffer. */ if (blkp->bi_lbn >= 0) /* Data Block */ bp = lfs_fakebuf(vp, blkp->bi_lbn, bsize, blkp->bi_bp); else { bp = getblk(vp, blkp->bi_lbn, bsize, 0, 0); if (!(bp->b_flags & (B_DELWRI | B_DONE | B_CACHE)) && (error = copyin(blkp->bi_bp, bp->b_data, bsize))) goto err2; if (error = VOP_BWRITE(bp)) goto err2; } while (lfs_gatherblock(sp, bp, NULL)); } if (sp->vp) { if (sp->fip->fi_nblocks == 0) { DEC_FINFO(sp); sp->sum_bytes_left += sizeof(FINFO) - sizeof(daddr_t); } else lfs_updatemeta(sp); lfs_writeinode(fs, sp, ip); lfs_vunref(vp); } (void) lfs_writeseg(fs, sp); lfs_segunlock(fs); free(start, M_SEGMENT); return (error); /* * XXX * If we come in to error 2, we might have indirect blocks that were * updated and now have bad block pointers. I don't know what to do * about this. */ err2: lfs_vunref(vp); /* Free up fakebuffers */ for (bpp = --sp->cbpp; bpp >= sp->bpp; --bpp) if ((*bpp)->b_flags & B_CALL) { brelvp(*bpp); free(*bpp, M_SEGMENT); } else brelse(*bpp); lfs_segunlock(fs); err1: free(start, M_SEGMENT); return (error); } /* * lfs_bmapv: * * This will fill in the current disk address for arrays of blocks. * * 0 on success * -1/errno is return on error. */ int lfs_bmapv(p, v, retval) struct proc *p; void *v; register_t *retval; { struct lfs_bmapv_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct block_info *) blkiov; syscallarg(int) blkcnt; } */ *uap = v; BLOCK_INFO *blkp; struct mount *mntp; struct vnode *vp; fsid_t fsid; void *start; daddr_t daddr; int cnt, error, step; if (error = suser(p->p_ucred, &p->p_acflag)) return (error); if (error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) return (error); if ((mntp = getvfs(&fsid)) == NULL) return (EINVAL); cnt = SCARG(uap, blkcnt); start = blkp = malloc(cnt * sizeof(BLOCK_INFO), M_SEGMENT, M_WAITOK); if (error = copyin(SCARG(uap, blkiov), blkp, cnt * sizeof(BLOCK_INFO))) { free(blkp, M_SEGMENT); return (error); } for (step = cnt; step--; ++blkp) { if (blkp->bi_lbn == LFS_UNUSED_LBN) continue; /* Could be a deadlock ? */ if (VFS_VGET(mntp, blkp->bi_inode, &vp)) daddr = LFS_UNUSED_DADDR; else { if (VOP_BMAP(vp, blkp->bi_lbn, NULL, &daddr, NULL)) daddr = LFS_UNUSED_DADDR; vput(vp); } blkp->bi_daddr = daddr; } copyout(start, SCARG(uap, blkiov), cnt * sizeof(BLOCK_INFO)); free(start, M_SEGMENT); return (0); } /* * lfs_segclean: * * Mark the segment clean. * * 0 on success * -1/errno is return on error. */ int lfs_segclean(p, v, retval) struct proc *p; void *v; register_t *retval; { struct lfs_segclean_args /* { syscallarg(fsid_t *) fsidp; syscallarg(u_long) segment; } */ *uap = v; CLEANERINFO *cip; SEGUSE *sup; struct buf *bp; struct mount *mntp; struct lfs *fs; fsid_t fsid; int error; if (error = suser(p->p_ucred, &p->p_acflag)) return (error); if (error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) return (error); if ((mntp = getvfs(&fsid)) == NULL) return (EINVAL); fs = VFSTOUFS(mntp)->um_lfs; if (datosn(fs, fs->lfs_curseg) == SCARG(uap, segment)) return (EBUSY); LFS_SEGENTRY(sup, fs, SCARG(uap, segment), bp); if (sup->su_flags & SEGUSE_ACTIVE) { brelse(bp); return (EBUSY); } fs->lfs_avail += fsbtodb(fs, fs->lfs_ssize) - 1; fs->lfs_bfree += (sup->su_nsums * LFS_SUMMARY_SIZE / DEV_BSIZE) + sup->su_ninos * btodb(fs->lfs_bsize); sup->su_flags &= ~SEGUSE_DIRTY; (void) VOP_BWRITE(bp); LFS_CLEANERINFO(cip, fs, bp); ++cip->clean; --cip->dirty; (void) VOP_BWRITE(bp); wakeup(&fs->lfs_avail); return (0); } /* * lfs_segwait: * * This will block until a segment in file system fsid is written. A timeout * in milliseconds may be specified which will awake the cleaner automatically. * An fsid of -1 means any file system, and a timeout of 0 means forever. * * 0 on success * 1 on timeout * -1/errno is return on error. */ int lfs_segwait(p, v, retval) struct proc *p; void *v; register_t *retval; { struct lfs_segwait_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct timeval *) tv; } */ *uap = v; extern int lfs_allclean_wakeup; struct mount *mntp; struct timeval atv; fsid_t fsid; void *addr; u_long timeout; int error, s; if (error = suser(p->p_ucred, &p->p_acflag)) { return (error); } #ifdef WHEN_QUADS_WORK if (error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) return (error); if (fsid == (fsid_t)-1) addr = &lfs_allclean_wakeup; else { if ((mntp = getvfs(&fsid)) == NULL) return (EINVAL); addr = &VFSTOUFS(mntp)->um_lfs->lfs_nextseg; } #else if (error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) return (error); if ((mntp = getvfs(&fsid)) == NULL) addr = &lfs_allclean_wakeup; else addr = &VFSTOUFS(mntp)->um_lfs->lfs_nextseg; #endif if (SCARG(uap, tv)) { if (error = copyin(SCARG(uap, tv), &atv, sizeof(struct timeval))) return (error); if (itimerfix(&atv)) return (EINVAL); s = splclock(); timeradd(&atv, &time, &atv); timeout = hzto(&atv); splx(s); } else timeout = 0; error = tsleep(addr, PCATCH | PUSER, "segment", timeout); return (error == ERESTART ? EINTR : 0); } /* * VFS_VGET call specialized for the cleaner. The cleaner already knows the * daddr from the ifile, so don't look it up again. If the cleaner is * processing IINFO structures, it may have the ondisk inode already, so * don't go retrieving it again. */ int lfs_fastvget(mp, ino, daddr, vpp, dinp) struct mount *mp; ino_t ino; daddr_t daddr; struct vnode **vpp; struct dinode *dinp; { register struct inode *ip; struct vnode *vp; struct ufsmount *ump; struct buf *bp; dev_t dev; int error; ump = VFSTOUFS(mp); dev = ump->um_dev; /* * This is playing fast and loose. Someone may have the inode * locked, in which case they are going to be distinctly unhappy * if we trash something. */ if ((*vpp = ufs_ihashlookup(dev, ino)) != NULL) { lfs_vref(*vpp); if ((*vpp)->v_flag & VXLOCK) printf ("Cleaned vnode VXLOCKED\n"); ip = VTOI(*vpp); if (ip->i_flag & IN_LOCKED) printf("cleaned vnode locked\n"); if (!(ip->i_flag & IN_MODIFIED)) { ++ump->um_lfs->lfs_uinodes; ip->i_flag |= IN_MODIFIED; } ip->i_flag |= IN_MODIFIED; return (0); } /* Allocate new vnode/inode. */ if (error = lfs_vcreate(mp, ino, &vp)) { *vpp = NULL; return (error); } /* * Put it onto its hash chain and lock it so that other requests for * this inode will block if they arrive while we are sleeping waiting * for old data structures to be purged or for the contents of the * disk portion of this inode to be read. */ ip = VTOI(vp); ufs_ihashins(ip); /* * XXX * This may not need to be here, logically it should go down with * the i_devvp initialization. * Ask Kirk. */ ip->i_lfs = ump->um_lfs; /* Read in the disk contents for the inode, copy into the inode. */ if (dinp) if (error = copyin(dinp, &ip->i_din, sizeof(struct dinode))) return (error); else { if (error = bread(ump->um_devvp, daddr, (int)ump->um_lfs->lfs_bsize, NOCRED, &bp)) { /* * The inode does not contain anything useful, so it * would be misleading to leave it on its hash chain. * Iput() will return it to the free list. */ ufs_ihashrem(ip); /* Unlock and discard unneeded inode. */ lfs_vunref(vp); brelse(bp); *vpp = NULL; return (error); } ip->i_din = *lfs_ifind(ump->um_lfs, ino, (struct dinode *)bp->b_data); brelse(bp); } /* Inode was just read from user space or disk, make sure it's locked */ ip->i_flag |= IN_LOCKED; /* * Initialize the vnode from the inode, check for aliases. In all * cases re-init ip, the underlying vnode/inode may have changed. */ if (error = ufs_vinit(mp, lfs_specop_p, LFS_FIFOOPS, &vp)) { lfs_vunref(vp); *vpp = NULL; return (error); } /* * Finish inode initialization now that aliasing has been resolved. */ ip->i_devvp = ump->um_devvp; ip->i_flag |= IN_MODIFIED; ++ump->um_lfs->lfs_uinodes; VREF(ip->i_devvp); *vpp = vp; return (0); } struct buf * lfs_fakebuf(vp, lbn, size, uaddr) struct vnode *vp; int lbn; size_t size; caddr_t uaddr; { struct buf *bp; bp = lfs_newbuf(vp, lbn, 0); bp->b_saveaddr = uaddr; bp->b_bufsize = size; bp->b_bcount = size; bp->b_flags |= B_INVAL; return (bp); }