/* $NetBSD: lfs_segment.c,v 1.278.4.1 2020/08/17 10:30:22 martin Exp $ */ /*- * Copyright (c) 1999, 2000, 2001, 2002, 2003 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Konrad E. Schroder . * * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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. */ /* * Copyright (c) 1991, 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. * * @(#)lfs_segment.c 8.10 (Berkeley) 6/10/95 */ #include __KERNEL_RCSID(0, "$NetBSD: lfs_segment.c,v 1.278.4.1 2020/08/17 10:30:22 martin Exp $"); #ifdef DEBUG # define vndebug(vp, str) do { \ if (VTOI(vp)->i_state & IN_CLEANING) \ DLOG((DLOG_WVNODE, "not writing ino %d because %s (op %d)\n", \ VTOI(vp)->i_number, (str), op)); \ } while(0) #else # define vndebug(vp, str) #endif #define ivndebug(vp, str) \ DLOG((DLOG_WVNODE, "ino %d: %s\n", VTOI(vp)->i_number, (str))) #if defined(_KERNEL_OPT) #include "opt_ddb.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include MALLOC_JUSTDEFINE(M_SEGMENT, "LFS segment", "Segment for LFS"); static void lfs_generic_callback(struct buf *, void (*)(struct buf *)); static void lfs_free_aiodone(struct buf *); static void lfs_super_aiodone(struct buf *); static void lfs_cluster_aiodone(struct buf *); static void lfs_cluster_callback(struct buf *); /* * Determine if it's OK to start a partial in this segment, or if we need * to go on to a new segment. */ #define LFS_PARTIAL_FITS(fs) \ (lfs_sb_getfsbpseg(fs) - \ (lfs_sb_getoffset(fs) - lfs_sb_getcurseg(fs)) > \ lfs_sb_getfrag(fs)) /* * Figure out whether we should do a checkpoint write or go ahead with * an ordinary write. */ #define LFS_SHOULD_CHECKPOINT(fs, flags) \ ((flags & SEGM_CLEAN) == 0 && \ ((fs->lfs_nactive > LFS_MAX_ACTIVE || \ (flags & SEGM_CKP) || \ lfs_sb_getnclean(fs) < LFS_MAX_ACTIVE))) int lfs_match_fake(struct lfs *, struct buf *); void lfs_newseg(struct lfs *); void lfs_supercallback(struct buf *); void lfs_updatemeta(struct segment *); void lfs_writesuper(struct lfs *, daddr_t); int lfs_writevnodes(struct lfs *fs, struct mount *mp, struct segment *sp, int dirops); static void lfs_shellsort(struct lfs *, struct buf **, union lfs_blocks *, int, int); kcondvar_t lfs_allclean_wakeup; /* Cleaner wakeup address. */ int lfs_writeindir = 1; /* whether to flush indir on non-ckp */ int lfs_clean_vnhead = 0; /* Allow freeing to head of vn list */ int lfs_dirvcount = 0; /* # active dirops */ /* Statistics Counters */ int lfs_dostats = 1; struct lfs_stats lfs_stats; /* op values to lfs_writevnodes */ #define VN_REG 0 #define VN_DIROP 1 #define VN_EMPTY 2 #define VN_CLEAN 3 /* * XXX KS - Set modification time on the Ifile, so the cleaner can * read the fs mod time off of it. We don't set IN_UPDATE here, * since we don't really need this to be flushed to disk (and in any * case that wouldn't happen to the Ifile until we checkpoint). */ void lfs_imtime(struct lfs *fs) { struct timespec ts; struct inode *ip; ASSERT_MAYBE_SEGLOCK(fs); vfs_timestamp(&ts); ip = VTOI(fs->lfs_ivnode); lfs_dino_setmtime(fs, ip->i_din, ts.tv_sec); lfs_dino_setmtimensec(fs, ip->i_din, ts.tv_nsec); } /* * Ifile and meta data blocks are not marked busy, so segment writes MUST be * single threaded. Currently, there are two paths into lfs_segwrite, sync() * and getnewbuf(). They both mark the file system busy. Lfs_vflush() * explicitly marks the file system busy. So lfs_segwrite is safe. I think. */ #define IS_FLUSHING(fs,vp) ((fs)->lfs_flushvp == (vp)) int lfs_vflush(struct vnode *vp) { struct inode *ip; struct lfs *fs; struct segment *sp; struct buf *bp, *nbp, *tbp, *tnbp; int error; int flushed; int relock; ip = VTOI(vp); fs = VFSTOULFS(vp->v_mount)->um_lfs; relock = 0; top: KASSERT(mutex_owned(vp->v_interlock) == false); KASSERT(mutex_owned(&lfs_lock) == false); KASSERT(mutex_owned(&bufcache_lock) == false); ASSERT_NO_SEGLOCK(fs); if (ip->i_state & IN_CLEANING) { ivndebug(vp,"vflush/in_cleaning"); mutex_enter(&lfs_lock); LFS_CLR_UINO(ip, IN_CLEANING); LFS_SET_UINO(ip, IN_MODIFIED); mutex_exit(&lfs_lock); /* * Toss any cleaning buffers that have real counterparts * to avoid losing new data. */ mutex_enter(vp->v_interlock); for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); if (!LFS_IS_MALLOC_BUF(bp)) continue; /* * Look for pages matching the range covered * by cleaning blocks. It's okay if more dirty * pages appear, so long as none disappear out * from under us. */ if (bp->b_lblkno > 0 && vp->v_type == VREG && vp != fs->lfs_ivnode) { struct vm_page *pg; voff_t off; for (off = lfs_lblktosize(fs, bp->b_lblkno); off < lfs_lblktosize(fs, bp->b_lblkno + 1); off += PAGE_SIZE) { pg = uvm_pagelookup(&vp->v_uobj, off); if (pg == NULL) continue; if ((pg->flags & PG_CLEAN) == 0 || pmap_is_modified(pg)) { lfs_sb_addavail(fs, lfs_btofsb(fs, bp->b_bcount)); wakeup(&fs->lfs_availsleep); mutex_exit(vp->v_interlock); lfs_freebuf(fs, bp); mutex_enter(vp->v_interlock); bp = NULL; break; } } } for (tbp = LIST_FIRST(&vp->v_dirtyblkhd); tbp; tbp = tnbp) { tnbp = LIST_NEXT(tbp, b_vnbufs); if (tbp->b_vp == bp->b_vp && tbp->b_lblkno == bp->b_lblkno && tbp != bp) { lfs_sb_addavail(fs, lfs_btofsb(fs, bp->b_bcount)); wakeup(&fs->lfs_availsleep); mutex_exit(vp->v_interlock); lfs_freebuf(fs, bp); mutex_enter(vp->v_interlock); bp = NULL; break; } } } } else { mutex_enter(vp->v_interlock); } /* If the node is being written, wait until that is done */ while (WRITEINPROG(vp)) { ivndebug(vp,"vflush/writeinprog"); cv_wait(&vp->v_cv, vp->v_interlock); } error = vdead_check(vp, VDEAD_NOWAIT); mutex_exit(vp->v_interlock); /* Protect against deadlock in vinvalbuf() */ lfs_seglock(fs, SEGM_SYNC | ((error != 0) ? SEGM_RECLAIM : 0)); if (error != 0) { fs->lfs_reclino = ip->i_number; } /* If we're supposed to flush a freed inode, just toss it */ if (ip->i_lfs_iflags & LFSI_DELETED) { DLOG((DLOG_VNODE, "lfs_vflush: ino %d freed, not flushing\n", ip->i_number)); /* Drain v_numoutput */ mutex_enter(vp->v_interlock); while (vp->v_numoutput > 0) { cv_wait(&vp->v_cv, vp->v_interlock); } KASSERT(vp->v_numoutput == 0); mutex_exit(vp->v_interlock); mutex_enter(&bufcache_lock); for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); KASSERT((bp->b_flags & B_GATHERED) == 0); if (bp->b_oflags & BO_DELWRI) { /* XXX always true? */ lfs_sb_addavail(fs, lfs_btofsb(fs, bp->b_bcount)); wakeup(&fs->lfs_availsleep); } /* Copied from lfs_writeseg */ if (bp->b_iodone != NULL) { mutex_exit(&bufcache_lock); biodone(bp); mutex_enter(&bufcache_lock); } else { bremfree(bp); LFS_UNLOCK_BUF(bp); mutex_enter(vp->v_interlock); bp->b_flags &= ~(B_READ | B_GATHERED); bp->b_oflags = (bp->b_oflags & ~BO_DELWRI) | BO_DONE; bp->b_error = 0; reassignbuf(bp, vp); mutex_exit(vp->v_interlock); brelse(bp, 0); } } mutex_exit(&bufcache_lock); LFS_CLR_UINO(ip, IN_CLEANING); LFS_CLR_UINO(ip, IN_MODIFIED | IN_ACCESSED); ip->i_state &= ~IN_ALLMOD; DLOG((DLOG_VNODE, "lfs_vflush: done not flushing ino %d\n", ip->i_number)); lfs_segunlock(fs); KASSERT(LIST_FIRST(&vp->v_dirtyblkhd) == NULL); return 0; } fs->lfs_flushvp = vp; if (LFS_SHOULD_CHECKPOINT(fs, fs->lfs_sp->seg_flags)) { error = lfs_segwrite(vp->v_mount, SEGM_CKP | SEGM_SYNC); fs->lfs_flushvp = NULL; KASSERT(fs->lfs_flushvp_fakevref == 0); lfs_segunlock(fs); /* Make sure that any pending buffers get written */ mutex_enter(vp->v_interlock); while (vp->v_numoutput > 0) { cv_wait(&vp->v_cv, vp->v_interlock); } KASSERT(LIST_FIRST(&vp->v_dirtyblkhd) == NULL); KASSERT(vp->v_numoutput == 0); mutex_exit(vp->v_interlock); return error; } sp = fs->lfs_sp; flushed = 0; if (VPISEMPTY(vp)) { lfs_writevnodes(fs, vp->v_mount, sp, VN_EMPTY); ++flushed; } else if ((ip->i_state & IN_CLEANING) && (fs->lfs_sp->seg_flags & SEGM_CLEAN)) { ivndebug(vp,"vflush/clean"); lfs_writevnodes(fs, vp->v_mount, sp, VN_CLEAN); ++flushed; } else if (lfs_dostats) { if (!VPISEMPTY(vp) || (VTOI(vp)->i_state & IN_ALLMOD)) ++lfs_stats.vflush_invoked; ivndebug(vp,"vflush"); } #ifdef DIAGNOSTIC if (vp->v_uflag & VU_DIROP) { DLOG((DLOG_VNODE, "lfs_vflush: flushing VU_DIROP\n")); /* panic("lfs_vflush: VU_DIROP being flushed...this can\'t happen"); */ } #endif do { #ifdef DEBUG int loopcount = 0; #endif do { if (LIST_FIRST(&vp->v_dirtyblkhd) != NULL) { relock = lfs_writefile(fs, sp, vp); if (relock && vp != fs->lfs_ivnode) { /* * Might have to wait for the * cleaner to run; but we're * still not done with this vnode. * XXX we can do better than this. */ KASSERT(ip->i_number != LFS_IFILE_INUM); lfs_writeinode(fs, sp, ip); mutex_enter(&lfs_lock); LFS_SET_UINO(ip, IN_MODIFIED); mutex_exit(&lfs_lock); lfs_writeseg(fs, sp); lfs_segunlock(fs); lfs_segunlock_relock(fs); goto top; } } /* * If we begin a new segment in the middle of writing * the Ifile, it creates an inconsistent checkpoint, * since the Ifile information for the new segment * is not up-to-date. Take care of this here by * sending the Ifile through again in case there * are newly dirtied blocks. But wait, there's more! * This second Ifile write could *also* cross a segment * boundary, if the first one was large. The second * one is guaranteed to be no more than 8 blocks, * though (two segment blocks and supporting indirects) * so the third write *will not* cross the boundary. */ if (vp == fs->lfs_ivnode) { lfs_writefile(fs, sp, vp); lfs_writefile(fs, sp, vp); } #ifdef DEBUG if (++loopcount > 2) log(LOG_NOTICE, "lfs_vflush: looping count=%d\n", loopcount); #endif } while (lfs_writeinode(fs, sp, ip)); } while (lfs_writeseg(fs, sp) && ip->i_number == LFS_IFILE_INUM); if (lfs_dostats) { ++lfs_stats.nwrites; if (sp->seg_flags & SEGM_SYNC) ++lfs_stats.nsync_writes; if (sp->seg_flags & SEGM_CKP) ++lfs_stats.ncheckpoints; } /* * If we were called from somewhere that has already held the seglock * (e.g., lfs_markv()), the lfs_segunlock will not wait for * the write to complete because we are still locked. * Since lfs_vflush() must return the vnode with no dirty buffers, * we must explicitly wait, if that is the case. * * We compare the iocount against 1, not 0, because it is * artificially incremented by lfs_seglock(). */ mutex_enter(&lfs_lock); if (fs->lfs_seglock > 1) { while (fs->lfs_iocount > 1) (void)mtsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs_vflush", 0, &lfs_lock); } mutex_exit(&lfs_lock); lfs_segunlock(fs); /* Wait for these buffers to be recovered by aiodoned */ mutex_enter(vp->v_interlock); while (vp->v_numoutput > 0) { cv_wait(&vp->v_cv, vp->v_interlock); } KASSERT(LIST_FIRST(&vp->v_dirtyblkhd) == NULL); KASSERT(vp->v_numoutput == 0); mutex_exit(vp->v_interlock); fs->lfs_flushvp = NULL; KASSERT(fs->lfs_flushvp_fakevref == 0); return (0); } struct lfs_writevnodes_ctx { int op; struct lfs *fs; }; static bool lfs_writevnodes_selector(void *cl, struct vnode *vp) { struct lfs_writevnodes_ctx *c = cl; struct inode *ip; int op = c->op; KASSERT(mutex_owned(vp->v_interlock)); ip = VTOI(vp); if (ip == NULL || vp->v_type == VNON) return false; if ((op == VN_DIROP && !(vp->v_uflag & VU_DIROP)) || (op != VN_DIROP && op != VN_CLEAN && (vp->v_uflag & VU_DIROP))) { vndebug(vp, "dirop"); return false; } if (op == VN_EMPTY && !VPISEMPTY(vp)) { vndebug(vp,"empty"); return false; } if (op == VN_CLEAN && ip->i_number != LFS_IFILE_INUM && vp != c->fs->lfs_flushvp && !(ip->i_state & IN_CLEANING)) { vndebug(vp,"cleaning"); return false; } mutex_enter(&lfs_lock); if (vp == c->fs->lfs_unlockvp) { mutex_exit(&lfs_lock); return false; } mutex_exit(&lfs_lock); return true; } int lfs_writevnodes(struct lfs *fs, struct mount *mp, struct segment *sp, int op) { struct inode *ip; struct vnode *vp; struct vnode_iterator *marker; struct lfs_writevnodes_ctx ctx; int inodes_written = 0; int error = 0; /* * XXX This was TAILQ_FOREACH_REVERSE on &mp->mnt_vnodelist. * XXX The rationale is unclear, the initial commit had no information. * XXX If the order really matters we have to sort the vnodes first. */ ASSERT_SEGLOCK(fs); vfs_vnode_iterator_init(mp, &marker); ctx.op = op; ctx.fs = fs; while ((vp = vfs_vnode_iterator_next(marker, lfs_writevnodes_selector, &ctx)) != NULL) { ip = VTOI(vp); /* * Write the inode/file if dirty and it's not the IFILE. */ if (((ip->i_state & IN_ALLMOD) || !VPISEMPTY(vp)) && ip->i_number != LFS_IFILE_INUM) { error = lfs_writefile(fs, sp, vp); if (error) { vrele(vp); if (error == EAGAIN) { /* * This error from lfs_putpages * indicates we need to drop * the segment lock and start * over after the cleaner has * had a chance to run. */ lfs_writeinode(fs, sp, ip); lfs_writeseg(fs, sp); if (!VPISEMPTY(vp) && !WRITEINPROG(vp) && !(ip->i_state & IN_ALLMOD)) { mutex_enter(&lfs_lock); LFS_SET_UINO(ip, IN_MODIFIED); mutex_exit(&lfs_lock); } break; } error = 0; /* XXX not quite right */ continue; } if (!VPISEMPTY(vp)) { if (WRITEINPROG(vp)) { ivndebug(vp,"writevnodes/write2"); } else if (!(ip->i_state & IN_ALLMOD)) { mutex_enter(&lfs_lock); LFS_SET_UINO(ip, IN_MODIFIED); mutex_exit(&lfs_lock); } } (void) lfs_writeinode(fs, sp, ip); inodes_written++; } vrele(vp); } vfs_vnode_iterator_destroy(marker); return error; } /* * Do a checkpoint. */ int lfs_segwrite(struct mount *mp, int flags) { struct buf *bp; struct inode *ip; struct lfs *fs; struct segment *sp; struct vnode *vp; SEGUSE *segusep; int do_ckp, did_ckp, error; unsigned n, segleft, maxseg, sn, i, curseg; int writer_set = 0; int dirty; int redo; SEGSUM *ssp; int um_error; fs = VFSTOULFS(mp)->um_lfs; ASSERT_MAYBE_SEGLOCK(fs); if (fs->lfs_ronly) return EROFS; lfs_imtime(fs); /* * Allocate a segment structure and enough space to hold pointers to * the maximum possible number of buffers which can be described in a * single summary block. */ do_ckp = LFS_SHOULD_CHECKPOINT(fs, flags); /* * If we know we're gonna need the writer lock, take it now to * preserve the lock order lfs_writer -> lfs_seglock. */ if (do_ckp) { lfs_writer_enter(fs, "ckpwriter"); writer_set = 1; } /* We can't do a partial write and checkpoint at the same time. */ if (do_ckp) flags &= ~SEGM_SINGLE; lfs_seglock(fs, flags | (do_ckp ? SEGM_CKP : 0)); sp = fs->lfs_sp; if (sp->seg_flags & (SEGM_CLEAN | SEGM_CKP)) do_ckp = 1; /* * If lfs_flushvp is non-NULL, we are called from lfs_vflush, * in which case we have to flush *all* buffers off of this vnode. * We don't care about other nodes, but write any non-dirop nodes * anyway in anticipation of another getnewvnode(). * * If we're cleaning we only write cleaning and ifile blocks, and * no dirops, since otherwise we'd risk corruption in a crash. */ if (sp->seg_flags & SEGM_CLEAN) lfs_writevnodes(fs, mp, sp, VN_CLEAN); else if (!(sp->seg_flags & SEGM_FORCE_CKP)) { do { um_error = lfs_writevnodes(fs, mp, sp, VN_REG); if ((sp->seg_flags & SEGM_SINGLE) && lfs_sb_getcurseg(fs) != fs->lfs_startseg) { DLOG((DLOG_SEG, "lfs_segwrite: breaking out of segment write at daddr 0x%jx\n", (uintmax_t)lfs_sb_getoffset(fs))); break; } if (do_ckp || (writer_set = lfs_writer_tryenter(fs)) != 0) { KASSERT(writer_set); KASSERT(fs->lfs_writer); error = lfs_writevnodes(fs, mp, sp, VN_DIROP); if (um_error == 0) um_error = error; /* * In case writevnodes errored out * XXX why are we always doing this and not * just on error? */ lfs_flush_dirops(fs); ssp = (SEGSUM *)(sp->segsum); lfs_ss_setflags(fs, ssp, lfs_ss_getflags(fs, ssp) & ~(SS_CONT)); lfs_finalize_fs_seguse(fs); } if (do_ckp && um_error) { lfs_segunlock_relock(fs); sp = fs->lfs_sp; } } while (do_ckp && um_error != 0); } /* * If we are doing a checkpoint, mark everything since the * last checkpoint as no longer ACTIVE. */ if (do_ckp || fs->lfs_doifile) { segleft = lfs_sb_getnseg(fs); curseg = 0; for (n = 0; n < lfs_sb_getsegtabsz(fs); n++) { int bread_error; dirty = 0; bread_error = bread(fs->lfs_ivnode, lfs_sb_getcleansz(fs) + n, lfs_sb_getbsize(fs), B_MODIFY, &bp); if (bread_error) panic("lfs_segwrite: ifile read: " "seguse %u: error %d\n", n, bread_error); segusep = (SEGUSE *)bp->b_data; maxseg = uimin(segleft, lfs_sb_getsepb(fs)); for (i = 0; i < maxseg; i++) { sn = curseg + i; if (sn != lfs_dtosn(fs, lfs_sb_getcurseg(fs)) && segusep->su_flags & SEGUSE_ACTIVE) { segusep->su_flags &= ~SEGUSE_ACTIVE; --fs->lfs_nactive; ++dirty; } fs->lfs_suflags[fs->lfs_activesb][sn] = segusep->su_flags; if (lfs_sb_getversion(fs) > 1) ++segusep; else segusep = (SEGUSE *) ((SEGUSE_V1 *)segusep + 1); } if (dirty) error = LFS_BWRITE_LOG(bp); /* Ifile */ else brelse(bp, 0); segleft -= lfs_sb_getsepb(fs); curseg += lfs_sb_getsepb(fs); } } KASSERT(LFS_SEGLOCK_HELD(fs)); did_ckp = 0; if (do_ckp || fs->lfs_doifile) { vp = fs->lfs_ivnode; #ifdef DEBUG int loopcount = 0; #endif do { LFS_ENTER_LOG("pretend", __FILE__, __LINE__, 0, 0, curproc->p_pid); mutex_enter(&lfs_lock); fs->lfs_flags &= ~LFS_IFDIRTY; mutex_exit(&lfs_lock); ip = VTOI(vp); if (LIST_FIRST(&vp->v_dirtyblkhd) != NULL) { /* * Ifile has no pages, so we don't need * to check error return here. */ lfs_writefile(fs, sp, vp); /* * Ensure the Ifile takes the current segment * into account. See comment in lfs_vflush. */ lfs_writefile(fs, sp, vp); lfs_writefile(fs, sp, vp); } if (ip->i_state & IN_ALLMOD) ++did_ckp; #if 0 redo = (do_ckp ? lfs_writeinode(fs, sp, ip) : 0); #else redo = lfs_writeinode(fs, sp, ip); #endif redo += lfs_writeseg(fs, sp); mutex_enter(&lfs_lock); redo += (fs->lfs_flags & LFS_IFDIRTY); mutex_exit(&lfs_lock); #ifdef DEBUG if (++loopcount > 2) log(LOG_NOTICE, "lfs_segwrite: looping count=%d\n", loopcount); #endif } while (redo && do_ckp); /* * Unless we are unmounting, the Ifile may continue to have * dirty blocks even after a checkpoint, due to changes to * inodes' atime. If we're checkpointing, it's "impossible" * for other parts of the Ifile to be dirty after the loop * above, since we hold the segment lock. */ mutex_enter(vp->v_interlock); if (LIST_EMPTY(&vp->v_dirtyblkhd)) { LFS_CLR_UINO(ip, IN_ALLMOD); } #ifdef DIAGNOSTIC else if (do_ckp) { int do_panic = 0; LIST_FOREACH(bp, &vp->v_dirtyblkhd, b_vnbufs) { if (bp->b_lblkno < lfs_sb_getcleansz(fs) + lfs_sb_getsegtabsz(fs) && !(bp->b_flags & B_GATHERED)) { printf("ifile lbn %ld still dirty (flags %lx)\n", (long)bp->b_lblkno, (long)bp->b_flags); ++do_panic; } } if (do_panic) panic("dirty blocks"); } #endif mutex_exit(vp->v_interlock); } else { (void) lfs_writeseg(fs, sp); } /* Note Ifile no longer needs to be written */ fs->lfs_doifile = 0; if (writer_set) lfs_writer_leave(fs); /* * If we didn't write the Ifile, we didn't really do anything. * That means that (1) there is a checkpoint on disk and (2) * nothing has changed since it was written. * * Take the flags off of the segment so that lfs_segunlock * doesn't have to write the superblock either. */ if (do_ckp && !did_ckp) { sp->seg_flags &= ~SEGM_CKP; } if (lfs_dostats) { ++lfs_stats.nwrites; if (sp->seg_flags & SEGM_SYNC) ++lfs_stats.nsync_writes; if (sp->seg_flags & SEGM_CKP) ++lfs_stats.ncheckpoints; } lfs_segunlock(fs); return (0); } /* * Write the dirty blocks associated with a vnode. */ int lfs_writefile(struct lfs *fs, struct segment *sp, struct vnode *vp) { struct inode *ip; int i, frag; SEGSUM *ssp; int error; ASSERT_SEGLOCK(fs); error = 0; ip = VTOI(vp); lfs_acquire_finfo(fs, ip->i_number, ip->i_gen); if (vp->v_uflag & VU_DIROP) { ssp = (SEGSUM *)sp->segsum; lfs_ss_setflags(fs, ssp, lfs_ss_getflags(fs, ssp) | (SS_DIROP|SS_CONT)); } if (sp->seg_flags & SEGM_CLEAN) { lfs_gather(fs, sp, vp, lfs_match_fake); /* * For a file being flushed, we need to write *all* blocks. * This means writing the cleaning blocks first, and then * immediately following with any non-cleaning blocks. * The same is true of the Ifile since checkpoints assume * that all valid Ifile blocks are written. */ if (IS_FLUSHING(fs, vp) || vp == fs->lfs_ivnode) { lfs_gather(fs, sp, vp, lfs_match_data); /* * Don't call VOP_PUTPAGES: if we're flushing, * we've already done it, and the Ifile doesn't * use the page cache. */ } } else { lfs_gather(fs, sp, vp, lfs_match_data); /* * If we're flushing, we've already called VOP_PUTPAGES * so don't do it again. Otherwise, we want to write * everything we've got. */ if (!IS_FLUSHING(fs, vp)) { mutex_enter(vp->v_interlock); error = VOP_PUTPAGES(vp, 0, 0, PGO_CLEANIT | PGO_ALLPAGES | PGO_LOCKED); } } /* * It may not be necessary to write the meta-data blocks at this point, * as the roll-forward recovery code should be able to reconstruct the * list. * * We have to write them anyway, though, under two conditions: (1) the * vnode is being flushed (for reuse by vinvalbuf); or (2) we are * checkpointing. * * BUT if we are cleaning, we might have indirect blocks that refer to * new blocks not being written yet, in addition to fragments being * moved out of a cleaned segment. If that is the case, don't * write the indirect blocks, or the finfo will have a small block * in the middle of it! * XXX in this case isn't the inode size wrong too? */ frag = 0; if (sp->seg_flags & SEGM_CLEAN) { for (i = 0; i < ULFS_NDADDR; i++) if (ip->i_lfs_fragsize[i] > 0 && ip->i_lfs_fragsize[i] < lfs_sb_getbsize(fs)) ++frag; } KASSERTMSG((frag <= 1), "lfs_writefile: more than one fragment! frag=%d", frag); if (IS_FLUSHING(fs, vp) || (frag == 0 && (lfs_writeindir || (sp->seg_flags & SEGM_CKP)))) { lfs_gather(fs, sp, vp, lfs_match_indir); lfs_gather(fs, sp, vp, lfs_match_dindir); lfs_gather(fs, sp, vp, lfs_match_tindir); } lfs_release_finfo(fs); return error; } /* * Update segment accounting to reflect this inode's change of address. */ static int lfs_update_iaddr(struct lfs *fs, struct segment *sp, struct inode *ip, daddr_t ndaddr) { struct buf *bp; daddr_t daddr; IFILE *ifp; SEGUSE *sup; ino_t ino; int redo_ifile; u_int32_t sn; redo_ifile = 0; /* * If updating the ifile, update the super-block. Update the disk * address and access times for this inode in the ifile. */ ino = ip->i_number; if (ino == LFS_IFILE_INUM) { daddr = lfs_sb_getidaddr(fs); lfs_sb_setidaddr(fs, LFS_DBTOFSB(fs, ndaddr)); } else { LFS_IENTRY(ifp, fs, ino, bp); daddr = lfs_if_getdaddr(fs, ifp); lfs_if_setdaddr(fs, ifp, LFS_DBTOFSB(fs, ndaddr)); (void)LFS_BWRITE_LOG(bp); /* Ifile */ } /* * If this is the Ifile and lfs_offset is set to the first block * in the segment, dirty the new segment's accounting block * (XXX should already be dirty?) and tell the caller to do it again. */ if (ip->i_number == LFS_IFILE_INUM) { sn = lfs_dtosn(fs, lfs_sb_getoffset(fs)); if (lfs_sntod(fs, sn) + lfs_btofsb(fs, lfs_sb_getsumsize(fs)) == lfs_sb_getoffset(fs)) { LFS_SEGENTRY(sup, fs, sn, bp); KASSERT(bp->b_oflags & BO_DELWRI); LFS_WRITESEGENTRY(sup, fs, sn, bp); /* fs->lfs_flags |= LFS_IFDIRTY; */ redo_ifile |= 1; } } /* * The inode's last address should not be in the current partial * segment, except under exceptional circumstances (lfs_writevnodes * had to start over, and in the meantime more blocks were written * to a vnode). Both inodes will be accounted to this segment * in lfs_writeseg so we need to subtract the earlier version * here anyway. The segment count can temporarily dip below * zero here; keep track of how many duplicates we have in * "dupino" so we don't panic below. */ if (daddr >= lfs_sb_getlastpseg(fs) && daddr <= lfs_sb_getoffset(fs)) { ++sp->ndupino; DLOG((DLOG_SEG, "lfs_writeinode: last inode addr in current pseg " "(ino %d daddr 0x%llx) ndupino=%d\n", ino, (long long)daddr, sp->ndupino)); } /* * Account the inode: it no longer belongs to its former segment, * though it will not belong to the new segment until that segment * is actually written. */ if (daddr != LFS_UNUSED_DADDR) { u_int32_t oldsn = lfs_dtosn(fs, daddr); int ndupino __diagused = (sp->seg_number == oldsn) ? sp->ndupino : 0; LFS_SEGENTRY(sup, fs, oldsn, bp); KASSERTMSG(((sup->su_nbytes + DINOSIZE(fs)*ndupino) >= DINOSIZE(fs)), "lfs_writeinode: negative bytes " "(segment %" PRIu32 " short by %d, " "oldsn=%" PRIu32 ", cursn=%" PRIu32 ", daddr=%" PRId64 ", su_nbytes=%u, " "ndupino=%d)\n", lfs_dtosn(fs, daddr), (int)DINOSIZE(fs) * (1 - sp->ndupino) - sup->su_nbytes, oldsn, sp->seg_number, daddr, (unsigned int)sup->su_nbytes, sp->ndupino); DLOG((DLOG_SU, "seg %d -= %d for ino %d inode\n", lfs_dtosn(fs, daddr), DINOSIZE(fs), ino)); sup->su_nbytes -= DINOSIZE(fs); redo_ifile |= (ino == LFS_IFILE_INUM && !(bp->b_flags & B_GATHERED)); if (redo_ifile) { mutex_enter(&lfs_lock); fs->lfs_flags |= LFS_IFDIRTY; mutex_exit(&lfs_lock); /* Don't double-account */ lfs_sb_setidaddr(fs, 0x0); } LFS_WRITESEGENTRY(sup, fs, oldsn, bp); /* Ifile */ } return redo_ifile; } int lfs_writeinode(struct lfs *fs, struct segment *sp, struct inode *ip) { struct buf *bp; union lfs_dinode *cdp; struct vnode *vp = ITOV(ip); daddr_t daddr; IINFO *iip; int i; int redo_ifile = 0; int gotblk = 0; int count; SEGSUM *ssp; ASSERT_SEGLOCK(fs); if (!(ip->i_state & IN_ALLMOD) && !(vp->v_uflag & VU_DIROP)) return (0); /* Can't write ifile when writer is not set */ KASSERT(ip->i_number != LFS_IFILE_INUM || fs->lfs_writer > 0 || (sp->seg_flags & SEGM_CLEAN)); /* * If this is the Ifile, see if writing it here will generate a * temporary misaccounting. If it will, do the accounting and write * the blocks, postponing the inode write until the accounting is * solid. */ count = 0; while (vp == fs->lfs_ivnode) { int redo = 0; if (sp->idp == NULL && sp->ibp == NULL && (sp->seg_bytes_left < lfs_sb_getibsize(fs) || sp->sum_bytes_left < sizeof(int32_t))) { (void) lfs_writeseg(fs, sp); continue; } /* Look for dirty Ifile blocks */ LIST_FOREACH(bp, &fs->lfs_ivnode->v_dirtyblkhd, b_vnbufs) { if (!(bp->b_flags & B_GATHERED)) { redo = 1; break; } } if (redo == 0) redo = lfs_update_iaddr(fs, sp, ip, 0x0); if (redo == 0) break; if (sp->idp) { lfs_dino_setinumber(fs, sp->idp, 0); sp->idp = NULL; } ++count; if (count > 2) log(LOG_NOTICE, "lfs_writeinode: looping count=%d\n", count); lfs_writefile(fs, sp, fs->lfs_ivnode); } /* Allocate a new inode block if necessary. */ if ((ip->i_number != LFS_IFILE_INUM || sp->idp == NULL) && sp->ibp == NULL) { /* Allocate a new segment if necessary. */ if (sp->seg_bytes_left < lfs_sb_getibsize(fs) || sp->sum_bytes_left < sizeof(int32_t)) (void) lfs_writeseg(fs, sp); /* Get next inode block. */ daddr = lfs_sb_getoffset(fs); lfs_sb_addoffset(fs, lfs_btofsb(fs, lfs_sb_getibsize(fs))); sp->ibp = *sp->cbpp++ = getblk(VTOI(fs->lfs_ivnode)->i_devvp, LFS_FSBTODB(fs, daddr), lfs_sb_getibsize(fs), 0, 0); gotblk++; /* Zero out inode numbers */ for (i = 0; i < LFS_INOPB(fs); ++i) { union lfs_dinode *tmpdi; tmpdi = (union lfs_dinode *)((char *)sp->ibp->b_data + DINOSIZE(fs) * i); lfs_dino_setinumber(fs, tmpdi, 0); } ++sp->start_bpp; lfs_sb_subavail(fs, lfs_btofsb(fs, lfs_sb_getibsize(fs))); /* Set remaining space counters. */ sp->seg_bytes_left -= lfs_sb_getibsize(fs); sp->sum_bytes_left -= sizeof(int32_t); /* Store the address in the segment summary. */ iip = NTH_IINFO(fs, sp->segsum, sp->ninodes / LFS_INOPB(fs)); lfs_ii_setblock(fs, iip, daddr); } /* Check VU_DIROP in case there is a new file with no data blocks */ if (vp->v_uflag & VU_DIROP) { ssp = (SEGSUM *)sp->segsum; lfs_ss_setflags(fs, ssp, lfs_ss_getflags(fs, ssp) | (SS_DIROP|SS_CONT)); } /* Update the inode times and copy the inode onto the inode page. */ /* XXX kludge --- don't redirty the ifile just to put times on it */ if (ip->i_number != LFS_IFILE_INUM) LFS_ITIMES(ip, NULL, NULL, NULL); /* * If this is the Ifile, and we've already written the Ifile in this * partial segment, just overwrite it (it's not on disk yet) and * continue. * * XXX we know that the bp that we get the second time around has * already been gathered. */ if (ip->i_number == LFS_IFILE_INUM && sp->idp) { lfs_copy_dinode(fs, sp->idp, ip->i_din); ip->i_lfs_osize = ip->i_size; return 0; } bp = sp->ibp; cdp = DINO_IN_BLOCK(fs, bp->b_data, sp->ninodes % LFS_INOPB(fs)); lfs_copy_dinode(fs, cdp, ip->i_din); /* * This inode is on its way to disk; clear its VU_DIROP status when * the write is complete. */ if (vp->v_uflag & VU_DIROP) { if (!(sp->seg_flags & SEGM_CLEAN)) ip->i_state |= IN_CDIROP; else { DLOG((DLOG_DIROP, "lfs_writeinode: not clearing dirop for cleaned ino %d\n", (int)ip->i_number)); } } /* * If cleaning, link counts and directory file sizes cannot change, * since those would be directory operations---even if the file * we are writing is marked VU_DIROP we should write the old values. * If we're not cleaning, of course, update the values so we get * current values the next time we clean. */ if (sp->seg_flags & SEGM_CLEAN) { if (vp->v_uflag & VU_DIROP) { lfs_dino_setnlink(fs, cdp, ip->i_lfs_odnlink); /* if (vp->v_type == VDIR) */ lfs_dino_setsize(fs, cdp, ip->i_lfs_osize); } } else { ip->i_lfs_odnlink = lfs_dino_getnlink(fs, cdp); ip->i_lfs_osize = ip->i_size; } /* We can finish the segment accounting for truncations now */ lfs_finalize_ino_seguse(fs, ip); /* * If we are cleaning, ensure that we don't write UNWRITTEN disk * addresses to disk; possibly change the on-disk record of * the inode size, either by reverting to the previous size * (in the case of cleaning) or by verifying the inode's block * holdings (in the case of files being allocated as they are being * written). * XXX By not writing UNWRITTEN blocks, we are making the lfs_avail * XXX count on disk wrong by the same amount. We should be * XXX able to "borrow" from lfs_avail and return it after the * XXX Ifile is written. See also in lfs_writeseg. */ /* Check file size based on highest allocated block */ if (((lfs_dino_getmode(fs, ip->i_din) & LFS_IFMT) == LFS_IFREG || (lfs_dino_getmode(fs, ip->i_din) & LFS_IFMT) == LFS_IFDIR) && ip->i_size > ((ip->i_lfs_hiblk + 1) << lfs_sb_getbshift(fs))) { lfs_dino_setsize(fs, cdp, (ip->i_lfs_hiblk + 1) << lfs_sb_getbshift(fs)); DLOG((DLOG_SEG, "lfs_writeinode: ino %d size %" PRId64 " -> %" PRId64 "\n", (int)ip->i_number, ip->i_size, lfs_dino_getsize(fs, cdp))); } if (ip->i_lfs_effnblks != lfs_dino_getblocks(fs, ip->i_din)) { DLOG((DLOG_SEG, "lfs_writeinode: cleansing ino %d eff %jd != nblk %d)" " at %jx\n", ip->i_number, (intmax_t)ip->i_lfs_effnblks, lfs_dino_getblocks(fs, ip->i_din), (uintmax_t)lfs_sb_getoffset(fs))); for (i=0; i> lfs_sb_getbshift(fs); i < ULFS_NDADDR; i++) { KASSERT(i >= 0); if ((lfs_dino_getmode(fs, cdp) & LFS_IFMT) == LFS_IFLNK) continue; if (((lfs_dino_getmode(fs, cdp) & LFS_IFMT) == LFS_IFBLK || (lfs_dino_getmode(fs, cdp) & LFS_IFMT) == LFS_IFCHR) && i == 0) continue; if (lfs_dino_getdb(fs, cdp, i) != 0) { # ifdef DEBUG lfs_dump_dinode(fs, cdp); # endif panic("writing inconsistent inode"); } } #endif /* DIAGNOSTIC */ if (ip->i_state & IN_CLEANING) LFS_CLR_UINO(ip, IN_CLEANING); else { /* XXX IN_ALLMOD */ LFS_CLR_UINO(ip, IN_ACCESSED | IN_ACCESS | IN_CHANGE | IN_UPDATE | IN_MODIFY); if (ip->i_lfs_effnblks == lfs_dino_getblocks(fs, ip->i_din)) LFS_CLR_UINO(ip, IN_MODIFIED); else { DLOG((DLOG_VNODE, "lfs_writeinode: ino %d: real " "blks=%d, eff=%jd\n", ip->i_number, lfs_dino_getblocks(fs, ip->i_din), (intmax_t)ip->i_lfs_effnblks)); } } if (ip->i_number == LFS_IFILE_INUM) { /* We know sp->idp == NULL */ sp->idp = DINO_IN_BLOCK(fs, bp, sp->ninodes % LFS_INOPB(fs)); /* Not dirty any more */ mutex_enter(&lfs_lock); fs->lfs_flags &= ~LFS_IFDIRTY; mutex_exit(&lfs_lock); } if (gotblk) { mutex_enter(&bufcache_lock); LFS_LOCK_BUF(bp); brelsel(bp, 0); mutex_exit(&bufcache_lock); } /* Increment inode count in segment summary block. */ ssp = (SEGSUM *)sp->segsum; lfs_ss_setninos(fs, ssp, lfs_ss_getninos(fs, ssp) + 1); /* If this page is full, set flag to allocate a new page. */ if (++sp->ninodes % LFS_INOPB(fs) == 0) sp->ibp = NULL; redo_ifile = lfs_update_iaddr(fs, sp, ip, bp->b_blkno); KASSERT(redo_ifile == 0); return (redo_ifile); } int lfs_gatherblock(struct segment *sp, struct buf *bp, kmutex_t *mptr) { struct lfs *fs; int vers; int j, blksinblk; ASSERT_SEGLOCK(sp->fs); KASSERTMSG((sp->vp != NULL), "lfs_gatherblock: Null vp in segment"); /* If full, finish this segment. */ fs = sp->fs; blksinblk = howmany(bp->b_bcount, lfs_sb_getbsize(fs)); if (sp->sum_bytes_left < sizeof(int32_t) * blksinblk || sp->seg_bytes_left < bp->b_bcount) { if (mptr) mutex_exit(mptr); lfs_updatemeta(sp); vers = lfs_fi_getversion(fs, sp->fip); (void) lfs_writeseg(fs, sp); /* Add the current file to the segment summary. */ lfs_acquire_finfo(fs, VTOI(sp->vp)->i_number, vers); if (mptr) mutex_enter(mptr); return (1); } if (bp->b_flags & B_GATHERED) { DLOG((DLOG_SEG, "lfs_gatherblock: already gathered! Ino %ju," " lbn %" PRId64 "\n", (uintmax_t)lfs_fi_getino(fs, sp->fip), bp->b_lblkno)); return (0); } /* Insert into the buffer list, update the FINFO block. */ bp->b_flags |= B_GATHERED; *sp->cbpp++ = bp; for (j = 0; j < blksinblk; j++) { unsigned bn; bn = lfs_fi_getnblocks(fs, sp->fip); lfs_fi_setnblocks(fs, sp->fip, bn+1); lfs_fi_setblock(fs, sp->fip, bn, bp->b_lblkno + j); /* This block's accounting moves from lfs_favail to lfs_avail */ lfs_deregister_block(sp->vp, bp->b_lblkno + j); } sp->sum_bytes_left -= sizeof(int32_t) * blksinblk; sp->seg_bytes_left -= bp->b_bcount; return (0); } int lfs_gather(struct lfs *fs, struct segment *sp, struct vnode *vp, int (*match)(struct lfs *, struct buf *)) { struct buf *bp, *nbp; int count = 0; ASSERT_SEGLOCK(fs); if (vp->v_type == VBLK) return 0; KASSERT(sp->vp == NULL); sp->vp = vp; mutex_enter(&bufcache_lock); #ifndef LFS_NO_BACKBUF_HACK /* This is a hack to see if ordering the blocks in LFS makes a difference. */ # define BUF_OFFSET \ (((char *)&LIST_NEXT(bp, b_vnbufs)) - (char *)bp) # define BACK_BUF(BP) \ ((struct buf *)(((char *)(BP)->b_vnbufs.le_prev) - BUF_OFFSET)) # define BEG_OF_LIST \ ((struct buf *)(((char *)&LIST_FIRST(&vp->v_dirtyblkhd)) - BUF_OFFSET)) loop: /* Find last buffer. */ for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp && LIST_NEXT(bp, b_vnbufs) != NULL; bp = LIST_NEXT(bp, b_vnbufs)) continue; for (; bp && bp != BEG_OF_LIST; bp = nbp) { nbp = BACK_BUF(bp); #else /* LFS_NO_BACKBUF_HACK */ loop: for (bp = LIST_FIRST(&vp->v_dirtyblkhd); bp; bp = nbp) { nbp = LIST_NEXT(bp, b_vnbufs); #endif /* LFS_NO_BACKBUF_HACK */ if ((bp->b_cflags & BC_BUSY) != 0 || (bp->b_flags & B_GATHERED) != 0 || !match(fs, bp)) { #ifdef DEBUG if (vp == fs->lfs_ivnode && (bp->b_cflags & BC_BUSY) != 0 && (bp->b_flags & B_GATHERED) == 0) log(LOG_NOTICE, "lfs_gather: ifile lbn %" PRId64 " busy (%x) at 0x%jx", bp->b_lblkno, bp->b_flags, (uintmax_t)lfs_sb_getoffset(fs)); #endif continue; } #ifdef DIAGNOSTIC # ifdef LFS_USE_BC_INVAL if ((bp->b_cflags & BC_INVAL) != 0 && bp->b_iodone == NULL) { DLOG((DLOG_SEG, "lfs_gather: lbn %" PRId64 " is BC_INVAL\n", bp->b_lblkno)); VOP_PRINT(bp->b_vp); } # endif /* LFS_USE_BC_INVAL */ if (!(bp->b_oflags & BO_DELWRI)) panic("lfs_gather: bp not BO_DELWRI"); if (!(bp->b_flags & B_LOCKED)) { DLOG((DLOG_SEG, "lfs_gather: lbn %" PRId64 " blk %" PRId64 " not B_LOCKED\n", bp->b_lblkno, LFS_DBTOFSB(fs, bp->b_blkno))); VOP_PRINT(bp->b_vp); panic("lfs_gather: bp not B_LOCKED"); } #endif if (lfs_gatherblock(sp, bp, &bufcache_lock)) { goto loop; } count++; } mutex_exit(&bufcache_lock); lfs_updatemeta(sp); KASSERT(sp->vp == vp); sp->vp = NULL; return count; } #if DEBUG # define DEBUG_OOFF(n) do { \ if (ooff == 0) { \ DLOG((DLOG_SEG, "lfs_updatemeta[%d]: warning: writing " \ "ino %d lbn %" PRId64 " at 0x%" PRIx32 \ ", was 0x0 (or %" PRId64 ")\n", \ (n), ip->i_number, lbn, ndaddr, daddr)); \ } \ } while (0) #else # define DEBUG_OOFF(n) #endif /* * Change the given block's address to ndaddr, finding its previous * location using ulfs_bmaparray(). * * Account for this change in the segment table. * * called with sp == NULL by roll-forwarding code. */ void lfs_update_single(struct lfs *fs, struct segment *sp, struct vnode *vp, daddr_t lbn, daddr_t ndaddr, int size) { SEGUSE *sup; struct buf *bp; struct indir a[ULFS_NIADDR + 2], *ap; struct inode *ip; daddr_t daddr, ooff; int num, error; int bb, osize, obb; ASSERT_SEGLOCK(fs); KASSERT(sp == NULL || sp->vp == vp); ip = VTOI(vp); error = ulfs_bmaparray(vp, lbn, &daddr, a, &num, NULL, NULL); if (error) panic("lfs_updatemeta: ulfs_bmaparray returned %d", error); KASSERT(daddr <= LFS_MAX_DADDR(fs)); if (daddr > 0) daddr = LFS_DBTOFSB(fs, daddr); bb = lfs_numfrags(fs, size); switch (num) { case 0: ooff = lfs_dino_getdb(fs, ip->i_din, lbn); DEBUG_OOFF(0); if (ooff == UNWRITTEN) lfs_dino_setblocks(fs, ip->i_din, lfs_dino_getblocks(fs, ip->i_din) + bb); else { /* possible fragment truncation or extension */ obb = lfs_btofsb(fs, ip->i_lfs_fragsize[lbn]); lfs_dino_setblocks(fs, ip->i_din, lfs_dino_getblocks(fs, ip->i_din) + (bb-obb)); } lfs_dino_setdb(fs, ip->i_din, lbn, ndaddr); break; case 1: ooff = lfs_dino_getib(fs, ip->i_din, a[0].in_off); DEBUG_OOFF(1); if (ooff == UNWRITTEN) lfs_dino_setblocks(fs, ip->i_din, lfs_dino_getblocks(fs, ip->i_din) + bb); lfs_dino_setib(fs, ip->i_din, a[0].in_off, ndaddr); break; default: ap = &a[num - 1]; if (bread(vp, ap->in_lbn, lfs_sb_getbsize(fs), B_MODIFY, &bp)) panic("lfs_updatemeta: bread bno %" PRId64, ap->in_lbn); ooff = lfs_iblock_get(fs, bp->b_data, ap->in_off); DEBUG_OOFF(num); if (ooff == UNWRITTEN) lfs_dino_setblocks(fs, ip->i_din, lfs_dino_getblocks(fs, ip->i_din) + bb); lfs_iblock_set(fs, bp->b_data, ap->in_off, ndaddr); (void) VOP_BWRITE(bp->b_vp, bp); } KASSERT(ooff == 0 || ooff == UNWRITTEN || ooff == daddr); /* Update hiblk when extending the file */ if (lbn > ip->i_lfs_hiblk) ip->i_lfs_hiblk = lbn; /* * Though we'd rather it couldn't, this *can* happen right now * if cleaning blocks and regular blocks coexist. */ /* KASSERT(daddr < fs->lfs_lastpseg || daddr > ndaddr); */ /* * Update segment usage information, based on old size * and location. */ if (daddr > 0) { u_int32_t oldsn = lfs_dtosn(fs, daddr); int ndupino __diagused = (sp && sp->seg_number == oldsn ? sp->ndupino : 0); KASSERT(oldsn < lfs_sb_getnseg(fs)); if (lbn >= 0 && lbn < ULFS_NDADDR) osize = ip->i_lfs_fragsize[lbn]; else osize = lfs_sb_getbsize(fs); LFS_SEGENTRY(sup, fs, oldsn, bp); KASSERTMSG(((sup->su_nbytes + DINOSIZE(fs)*ndupino) >= osize), "lfs_updatemeta: negative bytes " "(segment %" PRIu32 " short by %" PRId64 ")\n" "lfs_updatemeta: ino %llu, lbn %" PRId64 ", addr = 0x%" PRIx64 "\n" "lfs_updatemeta: ndupino=%d", lfs_dtosn(fs, daddr), (int64_t)osize - (DINOSIZE(fs) * ndupino + sup->su_nbytes), (unsigned long long)ip->i_number, lbn, daddr, ndupino); DLOG((DLOG_SU, "seg %" PRIu32 " -= %d for ino %d lbn %" PRId64 " db 0x%" PRIx64 "\n", lfs_dtosn(fs, daddr), osize, ip->i_number, lbn, daddr)); sup->su_nbytes -= osize; if (!(bp->b_flags & B_GATHERED)) { mutex_enter(&lfs_lock); fs->lfs_flags |= LFS_IFDIRTY; mutex_exit(&lfs_lock); } LFS_WRITESEGENTRY(sup, fs, oldsn, bp); } /* * Now that this block has a new address, and its old * segment no longer owns it, we can forget about its * old size. */ if (lbn >= 0 && lbn < ULFS_NDADDR) ip->i_lfs_fragsize[lbn] = size; } /* * Update the metadata that points to the blocks listed in the FINFO * array. */ void lfs_updatemeta(struct segment *sp) { struct buf *sbp; struct lfs *fs; struct vnode *vp; daddr_t lbn; int i, nblocks, num; int __diagused nblocks_orig; int bb; int bytesleft, size; unsigned lastlength; union lfs_blocks tmpptr; fs = sp->fs; vp = sp->vp; ASSERT_SEGLOCK(fs); /* * This used to be: * * nblocks = &sp->fip->fi_blocks[sp->fip->fi_nblocks] - sp->start_lbp; * * that is, it allowed for the possibility that start_lbp did * not point to the beginning of the finfo block pointer area. * This particular formulation is six kinds of painful in the * lfs64 world where we have two sizes of block pointer, so * unless/until everything can be cleaned up to not move * start_lbp around but instead use an offset, we do the * following: * 1. Get NEXT_FINFO(sp->fip). This is the same pointer as * &sp->fip->fi_blocks[sp->fip->fi_nblocks], just the wrong * type. (Ugh.) * 2. Cast it to void *, then assign it to a temporary * union lfs_blocks. * 3. Subtract start_lbp from that. * 4. Save the value of nblocks in blocks_orig so we can * assert below that it hasn't changed without repeating this * rubbish. * * XXX. */ lfs_blocks_fromvoid(fs, &tmpptr, (void *)NEXT_FINFO(fs, sp->fip)); nblocks = lfs_blocks_sub(fs, &tmpptr, &sp->start_lbp); nblocks_orig = nblocks; KASSERT(nblocks >= 0); KASSERT(vp != NULL); if (nblocks == 0) return; /* * This count may be high due to oversize blocks from lfs_gop_write. * Correct for this. (XXX we should be able to keep track of these.) */ for (i = 0; i < nblocks; i++) { if (sp->start_bpp[i] == NULL) { DLOG((DLOG_SEG, "lfs_updatemeta: nblocks = %d, not %d\n", i, nblocks)); nblocks = i; break; } num = howmany(sp->start_bpp[i]->b_bcount, lfs_sb_getbsize(fs)); KASSERT(sp->start_bpp[i]->b_lblkno >= 0 || num == 1); nblocks -= num - 1; } #if 0 /* pre-lfs64 assertion */ KASSERT(vp->v_type == VREG || nblocks == &sp->fip->fi_blocks[sp->fip->fi_nblocks] - sp->start_lbp); #else KASSERT(vp->v_type == VREG || nblocks == nblocks_orig); #endif KASSERT(nblocks == sp->cbpp - sp->start_bpp); /* * Sort the blocks. * * We have to sort even if the blocks come from the * cleaner, because there might be other pending blocks on the * same inode...and if we don't sort, and there are fragments * present, blocks may be written in the wrong place. */ lfs_shellsort(fs, sp->start_bpp, &sp->start_lbp, nblocks, lfs_sb_getbsize(fs)); /* * Record the length of the last block in case it's a fragment. * If there are indirect blocks present, they sort last. An * indirect block will be lfs_bsize and its presence indicates * that you cannot have fragments. * * XXX This last is a lie. A cleaned fragment can coexist with * XXX a later indirect block. This will continue to be * XXX true until lfs_markv is fixed to do everything with * XXX fake blocks (including fake inodes and fake indirect blocks). */ lastlength = ((sp->start_bpp[nblocks - 1]->b_bcount - 1) & lfs_sb_getbmask(fs)) + 1; lfs_fi_setlastlength(fs, sp->fip, lastlength); /* * Assign disk addresses, and update references to the logical * block and the segment usage information. */ for (i = nblocks; i--; ++sp->start_bpp) { sbp = *sp->start_bpp; lbn = lfs_blocks_get(fs, &sp->start_lbp, 0); KASSERT(sbp->b_lblkno == lbn); sbp->b_blkno = LFS_FSBTODB(fs, lfs_sb_getoffset(fs)); /* * If we write a frag in the wrong place, the cleaner won't * be able to correctly identify its size later, and the * segment will be uncleanable. (Even worse, it will assume * that the indirect block that actually ends the list * is of a smaller size!) */ if ((sbp->b_bcount & lfs_sb_getbmask(fs)) && i != 0) panic("lfs_updatemeta: fragment is not last block"); /* * For each subblock in this possibly oversized block, * update its address on disk. */ KASSERT(lbn >= 0 || sbp->b_bcount == lfs_sb_getbsize(fs)); KASSERT(vp == sbp->b_vp); for (bytesleft = sbp->b_bcount; bytesleft > 0; bytesleft -= lfs_sb_getbsize(fs)) { size = MIN(bytesleft, lfs_sb_getbsize(fs)); bb = lfs_numfrags(fs, size); lbn = lfs_blocks_get(fs, &sp->start_lbp, 0); lfs_blocks_inc(fs, &sp->start_lbp); lfs_update_single(fs, sp, sp->vp, lbn, lfs_sb_getoffset(fs), size); lfs_sb_addoffset(fs, bb); } } /* This inode has been modified */ LFS_SET_UINO(VTOI(vp), IN_MODIFIED); } /* * Move lfs_offset to a segment earlier than newsn. */ int lfs_rewind(struct lfs *fs, int newsn) { int sn, osn, isdirty; struct buf *bp; SEGUSE *sup; ASSERT_SEGLOCK(fs); osn = lfs_dtosn(fs, lfs_sb_getoffset(fs)); if (osn < newsn) return 0; /* lfs_avail eats the remaining space in this segment */ lfs_sb_subavail(fs, lfs_sb_getfsbpseg(fs) - (lfs_sb_getoffset(fs) - lfs_sb_getcurseg(fs))); /* Find a low-numbered segment */ for (sn = 0; sn < lfs_sb_getnseg(fs); ++sn) { LFS_SEGENTRY(sup, fs, sn, bp); isdirty = sup->su_flags & SEGUSE_DIRTY; brelse(bp, 0); if (!isdirty) break; } if (sn == lfs_sb_getnseg(fs)) panic("lfs_rewind: no clean segments"); if (newsn >= 0 && sn >= newsn) return ENOENT; lfs_sb_setnextseg(fs, lfs_sntod(fs, sn)); lfs_newseg(fs); lfs_sb_setoffset(fs, lfs_sb_getcurseg(fs)); return 0; } /* * Start a new partial segment. * * Return 1 when we entered to a new segment. * Otherwise, return 0. */ int lfs_initseg(struct lfs *fs) { struct segment *sp = fs->lfs_sp; SEGSUM *ssp; struct buf *sbp; /* buffer for SEGSUM */ int repeat = 0; /* return value */ ASSERT_SEGLOCK(fs); /* Advance to the next segment. */ if (!LFS_PARTIAL_FITS(fs)) { SEGUSE *sup; struct buf *bp; /* lfs_avail eats the remaining space */ lfs_sb_subavail(fs, lfs_sb_getfsbpseg(fs) - (lfs_sb_getoffset(fs) - lfs_sb_getcurseg(fs))); /* Wake up any cleaning procs waiting on this file system. */ lfs_wakeup_cleaner(fs); lfs_newseg(fs); repeat = 1; lfs_sb_setoffset(fs, lfs_sb_getcurseg(fs)); sp->seg_number = lfs_dtosn(fs, lfs_sb_getcurseg(fs)); sp->seg_bytes_left = lfs_fsbtob(fs, lfs_sb_getfsbpseg(fs)); /* * If the segment contains a superblock, update the offset * and summary address to skip over it. */ LFS_SEGENTRY(sup, fs, sp->seg_number, bp); if (sup->su_flags & SEGUSE_SUPERBLOCK) { lfs_sb_addoffset(fs, lfs_btofsb(fs, LFS_SBPAD)); sp->seg_bytes_left -= LFS_SBPAD; } brelse(bp, 0); /* Segment zero could also contain the labelpad */ if (lfs_sb_getversion(fs) > 1 && sp->seg_number == 0 && lfs_sb_gets0addr(fs) < lfs_btofsb(fs, LFS_LABELPAD)) { lfs_sb_addoffset(fs, lfs_btofsb(fs, LFS_LABELPAD) - lfs_sb_gets0addr(fs)); sp->seg_bytes_left -= LFS_LABELPAD - lfs_fsbtob(fs, lfs_sb_gets0addr(fs)); } } else { sp->seg_number = lfs_dtosn(fs, lfs_sb_getcurseg(fs)); sp->seg_bytes_left = lfs_fsbtob(fs, lfs_sb_getfsbpseg(fs) - (lfs_sb_getoffset(fs) - lfs_sb_getcurseg(fs))); } lfs_sb_setlastpseg(fs, lfs_sb_getoffset(fs)); /* Record first address of this partial segment */ if (sp->seg_flags & SEGM_CLEAN) { fs->lfs_cleanint[fs->lfs_cleanind] = lfs_sb_getoffset(fs); if (++fs->lfs_cleanind >= LFS_MAX_CLEANIND) { /* "1" is the artificial inc in lfs_seglock */ mutex_enter(&lfs_lock); while (fs->lfs_iocount > 1) { mtsleep(&fs->lfs_iocount, PRIBIO + 1, "lfs_initseg", 0, &lfs_lock); } mutex_exit(&lfs_lock); fs->lfs_cleanind = 0; } } sp->fs = fs; sp->ibp = NULL; sp->idp = NULL; sp->ninodes = 0; sp->ndupino = 0; sp->cbpp = sp->bpp; /* Get a new buffer for SEGSUM */ sbp = lfs_newbuf(fs, VTOI(fs->lfs_ivnode)->i_devvp, LFS_FSBTODB(fs, lfs_sb_getoffset(fs)), lfs_sb_getsumsize(fs), LFS_NB_SUMMARY); /* ... and enter it into the buffer list. */ *sp->cbpp = sbp; sp->cbpp++; lfs_sb_addoffset(fs, lfs_btofsb(fs, lfs_sb_getsumsize(fs))); sp->start_bpp = sp->cbpp; /* Set point to SEGSUM, initialize it. */ ssp = sp->segsum = sbp->b_data; memset(ssp, 0, lfs_sb_getsumsize(fs)); lfs_ss_setnext(fs, ssp, lfs_sb_getnextseg(fs)); lfs_ss_setnfinfo(fs, ssp, 0); lfs_ss_setninos(fs, ssp, 0); lfs_ss_setmagic(fs, ssp, SS_MAGIC); /* Set pointer to first FINFO, initialize it. */ sp->fip = SEGSUM_FINFOBASE(fs, sp->segsum); lfs_fi_setnblocks(fs, sp->fip, 0); lfs_fi_setlastlength(fs, sp->fip, 0); lfs_blocks_fromfinfo(fs, &sp->start_lbp, sp->fip); sp->seg_bytes_left -= lfs_sb_getsumsize(fs); sp->sum_bytes_left = lfs_sb_getsumsize(fs) - SEGSUM_SIZE(fs); return (repeat); } /* * Remove SEGUSE_INVAL from all segments. */ void lfs_unset_inval_all(struct lfs *fs) { SEGUSE *sup; struct buf *bp; int i; for (i = 0; i < lfs_sb_getnseg(fs); i++) { LFS_SEGENTRY(sup, fs, i, bp); if (sup->su_flags & SEGUSE_INVAL) { sup->su_flags &= ~SEGUSE_INVAL; LFS_WRITESEGENTRY(sup, fs, i, bp); } else brelse(bp, 0); } } /* * Return the next segment to write. */ void lfs_newseg(struct lfs *fs) { CLEANERINFO *cip; SEGUSE *sup; struct buf *bp; int curseg, isdirty, sn, skip_inval; ASSERT_SEGLOCK(fs); /* Honor LFCNWRAPSTOP */ mutex_enter(&lfs_lock); while (lfs_sb_getnextseg(fs) < lfs_sb_getcurseg(fs) && fs->lfs_nowrap) { if (fs->lfs_wrappass) { log(LOG_NOTICE, "%s: wrappass=%d\n", lfs_sb_getfsmnt(fs), fs->lfs_wrappass); fs->lfs_wrappass = 0; break; } fs->lfs_wrapstatus = LFS_WRAP_WAITING; wakeup(&fs->lfs_nowrap); log(LOG_NOTICE, "%s: waiting at log wrap\n", lfs_sb_getfsmnt(fs)); mtsleep(&fs->lfs_wrappass, PVFS, "newseg", 10 * hz, &lfs_lock); } fs->lfs_wrapstatus = LFS_WRAP_GOING; mutex_exit(&lfs_lock); LFS_SEGENTRY(sup, fs, lfs_dtosn(fs, lfs_sb_getnextseg(fs)), bp); DLOG((DLOG_SU, "lfs_newseg: seg %d := 0 in newseg\n", lfs_dtosn(fs, lfs_sb_getnextseg(fs)))); sup->su_flags |= SEGUSE_DIRTY | SEGUSE_ACTIVE; sup->su_nbytes = 0; sup->su_nsums = 0; sup->su_ninos = 0; LFS_WRITESEGENTRY(sup, fs, lfs_dtosn(fs, lfs_sb_getnextseg(fs)), bp); LFS_CLEANERINFO(cip, fs, bp); lfs_ci_shiftcleantodirty(fs, cip, 1); lfs_sb_setnclean(fs, lfs_ci_getclean(fs, cip)); LFS_SYNC_CLEANERINFO(cip, fs, bp, 1); lfs_sb_setlastseg(fs, lfs_sb_getcurseg(fs)); lfs_sb_setcurseg(fs, lfs_sb_getnextseg(fs)); skip_inval = 1; for (sn = curseg = lfs_dtosn(fs, lfs_sb_getcurseg(fs)) + lfs_sb_getinterleave(fs);;) { sn = (sn + 1) % lfs_sb_getnseg(fs); if (sn == curseg) { if (skip_inval) skip_inval = 0; else panic("lfs_nextseg: no clean segments"); } LFS_SEGENTRY(sup, fs, sn, bp); isdirty = sup->su_flags & (SEGUSE_DIRTY | (skip_inval ? SEGUSE_INVAL : 0)); /* Check SEGUSE_EMPTY as we go along */ if (isdirty && sup->su_nbytes == 0 && !(sup->su_flags & SEGUSE_EMPTY)) LFS_WRITESEGENTRY(sup, fs, sn, bp); else brelse(bp, 0); if (!isdirty) break; } if (skip_inval == 0) lfs_unset_inval_all(fs); ++fs->lfs_nactive; lfs_sb_setnextseg(fs, lfs_sntod(fs, sn)); if (lfs_dostats) { ++lfs_stats.segsused; } } static struct buf * lfs_newclusterbuf(struct lfs *fs, struct vnode *vp, daddr_t addr, int n) { struct lfs_cluster *cl; struct buf **bpp, *bp; ASSERT_SEGLOCK(fs); cl = (struct lfs_cluster *)pool_get(&fs->lfs_clpool, PR_WAITOK); bpp = (struct buf **)pool_get(&fs->lfs_bpppool, PR_WAITOK); memset(cl, 0, sizeof(*cl)); cl->fs = fs; cl->bpp = bpp; cl->bufcount = 0; cl->bufsize = 0; /* If this segment is being written synchronously, note that */ if (fs->lfs_sp->seg_flags & SEGM_SYNC) { cl->flags |= LFS_CL_SYNC; cl->seg = fs->lfs_sp; ++cl->seg->seg_iocount; } /* Get an empty buffer header, or maybe one with something on it */ bp = getiobuf(vp, true); bp->b_dev = NODEV; bp->b_blkno = bp->b_lblkno = addr; bp->b_iodone = lfs_cluster_callback; bp->b_private = cl; return bp; } int lfs_writeseg(struct lfs *fs, struct segment *sp) { struct buf **bpp, *bp, *cbp, *newbp, *unbusybp; SEGUSE *sup; SEGSUM *ssp; int i; int do_again, nblocks, byteoffset; size_t el_size; struct lfs_cluster *cl; u_short ninos; struct vnode *devvp; char *p = NULL; struct vnode *vp; unsigned ibindex, iblimit; int changed; u_int32_t sum; size_t sumstart; #ifdef DEBUG FINFO *fip; int findex; #endif ASSERT_SEGLOCK(fs); ssp = (SEGSUM *)sp->segsum; /* * If there are no buffers other than the segment summary to write, * don't do anything. If we are the end of a dirop sequence, however, * write the empty segment summary anyway, to help out the * roll-forward agent. */ if ((nblocks = sp->cbpp - sp->bpp) == 1) { if ((lfs_ss_getflags(fs, ssp) & (SS_DIROP | SS_CONT)) != SS_DIROP) return 0; } /* Note if partial segment is being written by the cleaner */ if (sp->seg_flags & SEGM_CLEAN) lfs_ss_setflags(fs, ssp, lfs_ss_getflags(fs, ssp) | SS_CLEAN); /* Note if we are writing to reclaim */ if (sp->seg_flags & SEGM_RECLAIM) { lfs_ss_setflags(fs, ssp, lfs_ss_getflags(fs, ssp) | SS_RECLAIM); lfs_ss_setreclino(fs, ssp, fs->lfs_reclino); } devvp = VTOI(fs->lfs_ivnode)->i_devvp; /* Update the segment usage information. */ LFS_SEGENTRY(sup, fs, sp->seg_number, bp); /* Loop through all blocks, except the segment summary. */ for (bpp = sp->bpp; ++bpp < sp->cbpp; ) { if ((*bpp)->b_vp != devvp) { sup->su_nbytes += (*bpp)->b_bcount; DLOG((DLOG_SU, "seg %" PRIu32 " += %ld for ino %d" " lbn %" PRId64 " db 0x%" PRIx64 "\n", sp->seg_number, (*bpp)->b_bcount, VTOI((*bpp)->b_vp)->i_number, (*bpp)->b_lblkno, (*bpp)->b_blkno)); } } #ifdef DEBUG /* Check for zero-length and zero-version FINFO entries. */ fip = SEGSUM_FINFOBASE(fs, ssp); for (findex = 0; findex < lfs_ss_getnfinfo(fs, ssp); findex++) { KDASSERT(lfs_fi_getnblocks(fs, fip) > 0); KDASSERT(lfs_fi_getversion(fs, fip) > 0); fip = NEXT_FINFO(fs, fip); } #endif /* DEBUG */ ninos = (lfs_ss_getninos(fs, ssp) + LFS_INOPB(fs) - 1) / LFS_INOPB(fs); DLOG((DLOG_SU, "seg %d += %d for %d inodes\n", sp->seg_number, lfs_ss_getninos(fs, ssp) * DINOSIZE(fs), lfs_ss_getninos(fs, ssp))); sup->su_nbytes += lfs_ss_getninos(fs, ssp) * DINOSIZE(fs); /* sup->su_nbytes += lfs_sb_getsumsize(fs); */ if (lfs_sb_getversion(fs) == 1) sup->su_olastmod = time_second; else sup->su_lastmod = time_second; sup->su_ninos += ninos; ++sup->su_nsums; lfs_sb_subavail(fs, lfs_btofsb(fs, lfs_sb_getsumsize(fs))); do_again = !(bp->b_flags & B_GATHERED); LFS_WRITESEGENTRY(sup, fs, sp->seg_number, bp); /* Ifile */ /* * Mark blocks BC_BUSY, to prevent then from being changed between * the checksum computation and the actual write. * * If we are cleaning, check indirect blocks for UNWRITTEN, and if * there are any, replace them with copies that have UNASSIGNED * instead. */ mutex_enter(&bufcache_lock); for (bpp = sp->bpp, i = nblocks - 1; i--;) { ++bpp; bp = *bpp; if (bp->b_iodone != NULL) { /* UBC or malloced buffer */ bp->b_cflags |= BC_BUSY; continue; } while (bp->b_cflags & BC_BUSY) { DLOG((DLOG_SEG, "lfs_writeseg: avoiding potential" " data summary corruption for ino %d, lbn %" PRId64 "\n", VTOI(bp->b_vp)->i_number, bp->b_lblkno)); bp->b_cflags |= BC_WANTED; cv_wait(&bp->b_busy, &bufcache_lock); } bp->b_cflags |= BC_BUSY; mutex_exit(&bufcache_lock); unbusybp = NULL; /* * Check and replace indirect block UNWRITTEN bogosity. * XXX See comment in lfs_writefile. */ if (bp->b_lblkno < 0 && bp->b_vp != devvp && bp->b_vp && lfs_dino_getblocks(fs, VTOI(bp->b_vp)->i_din) != VTOI(bp->b_vp)->i_lfs_effnblks) { DLOG((DLOG_VNODE, "lfs_writeseg: cleansing ino %d (%jd != %d)\n", VTOI(bp->b_vp)->i_number, (intmax_t)VTOI(bp->b_vp)->i_lfs_effnblks, lfs_dino_getblocks(fs, VTOI(bp->b_vp)->i_din))); /* Make a copy we'll make changes to */ newbp = lfs_newbuf(fs, bp->b_vp, bp->b_lblkno, bp->b_bcount, LFS_NB_IBLOCK); newbp->b_blkno = bp->b_blkno; memcpy(newbp->b_data, bp->b_data, newbp->b_bcount); changed = 0; iblimit = newbp->b_bcount / LFS_BLKPTRSIZE(fs); for (ibindex = 0; ibindex < iblimit; ibindex++) { if (lfs_iblock_get(fs, newbp->b_data, ibindex) == UNWRITTEN) { ++changed; lfs_iblock_set(fs, newbp->b_data, ibindex, 0); } } /* * Get rid of the old buffer. Don't mark it clean, * though, if it still has dirty data on it. */ if (changed) { DLOG((DLOG_SEG, "lfs_writeseg: replacing UNWRITTEN(%d):" " bp = %p newbp = %p\n", changed, bp, newbp)); *bpp = newbp; bp->b_flags &= ~B_GATHERED; bp->b_error = 0; if (bp->b_iodone != NULL) { DLOG((DLOG_SEG, "lfs_writeseg: " "indir bp should not be B_CALL\n")); biodone(bp); bp = NULL; } else { /* Still on free list, leave it there */ unbusybp = bp; /* * We have to re-decrement lfs_avail * since this block is going to come * back around to us in the next * segment. */ lfs_sb_subavail(fs, lfs_btofsb(fs, bp->b_bcount)); } } else { lfs_freebuf(fs, newbp); } } mutex_enter(&bufcache_lock); if (unbusybp != NULL) { unbusybp->b_cflags &= ~BC_BUSY; if (unbusybp->b_cflags & BC_WANTED) cv_broadcast(&bp->b_busy); } } mutex_exit(&bufcache_lock); /* * Compute checksum across data and then across summary; the first * block (the summary block) is skipped. Set the create time here * so that it's guaranteed to be later than the inode mod times. */ sum = 0; if (lfs_sb_getversion(fs) == 1) el_size = sizeof(u_long); else el_size = sizeof(u_int32_t); for (bpp = sp->bpp, i = nblocks - 1; i--; ) { ++bpp; /* Loop through gop_write cluster blocks */ for (byteoffset = 0; byteoffset < (*bpp)->b_bcount; byteoffset += lfs_sb_getbsize(fs)) { #ifdef LFS_USE_BC_INVAL if (((*bpp)->b_cflags & BC_INVAL) != 0 && (*bpp)->b_iodone != NULL) { if (copyin((void *)(*bpp)->b_saveaddr + byteoffset, dp, el_size)) { panic("lfs_writeseg: copyin failed [1]:" " ino %" PRIu64 " blk %" PRId64, VTOI((*bpp)->b_vp)->i_number, (*bpp)->b_lblkno); } } else #endif /* LFS_USE_BC_INVAL */ { sum = lfs_cksum_part((char *) (*bpp)->b_data + byteoffset, el_size, sum); } } } if (lfs_sb_getversion(fs) == 1) lfs_ss_setocreate(fs, ssp, time_second); else { lfs_ss_setcreate(fs, ssp, time_second); lfs_sb_addserial(fs, 1); lfs_ss_setserial(fs, ssp, lfs_sb_getserial(fs)); lfs_ss_setident(fs, ssp, lfs_sb_getident(fs)); } lfs_ss_setdatasum(fs, ssp, lfs_cksum_fold(sum)); sumstart = lfs_ss_getsumstart(fs); lfs_ss_setsumsum(fs, ssp, cksum((char *)ssp + sumstart, lfs_sb_getsumsize(fs) - sumstart)); mutex_enter(&lfs_lock); lfs_sb_subbfree(fs, (lfs_btofsb(fs, ninos * lfs_sb_getibsize(fs)) + lfs_btofsb(fs, lfs_sb_getsumsize(fs)))); lfs_sb_adddmeta(fs, (lfs_btofsb(fs, ninos * lfs_sb_getibsize(fs)) + lfs_btofsb(fs, lfs_sb_getsumsize(fs)))); mutex_exit(&lfs_lock); /* * When we simply write the blocks we lose a rotation for every block * written. To avoid this problem, we cluster the buffers into a * chunk and write the chunk. MAXPHYS is the largest size I/O * devices can handle, use that for the size of the chunks. * * Blocks that are already clusters (from GOP_WRITE), however, we * don't bother to copy into other clusters. */ #define CHUNKSIZE MAXPHYS if (devvp == NULL) panic("devvp is NULL"); for (bpp = sp->bpp, i = nblocks; i;) { cbp = lfs_newclusterbuf(fs, devvp, (*bpp)->b_blkno, i); cl = cbp->b_private; cbp->b_flags |= B_ASYNC; cbp->b_cflags |= BC_BUSY; cbp->b_bcount = 0; KASSERTMSG((bpp - sp->bpp <= (lfs_sb_getsumsize(fs) - SEGSUM_SIZE(fs)) / sizeof(int32_t)), "lfs_writeseg: real bpp overwrite"); KASSERTMSG((bpp - sp->bpp <= lfs_segsize(fs) / lfs_sb_getfsize(fs)), "lfs_writeseg: theoretical bpp overwrite"); /* * Construct the cluster. */ mutex_enter(&lfs_lock); ++fs->lfs_iocount; mutex_exit(&lfs_lock); while (i && cbp->b_bcount < CHUNKSIZE) { bp = *bpp; if (bp->b_bcount > (CHUNKSIZE - cbp->b_bcount)) break; if (cbp->b_bcount > 0 && !(cl->flags & LFS_CL_MALLOC)) break; /* Clusters from GOP_WRITE are expedited */ if (bp->b_bcount > lfs_sb_getbsize(fs)) { if (cbp->b_bcount > 0) /* Put in its own buffer */ break; else { cbp->b_data = bp->b_data; } } else if (cbp->b_bcount == 0) { p = cbp->b_data = lfs_malloc(fs, CHUNKSIZE, LFS_NB_CLUSTER); cl->flags |= LFS_CL_MALLOC; } KASSERTMSG((lfs_dtosn(fs, LFS_DBTOFSB(fs, bp->b_blkno + btodb(bp->b_bcount - 1))) == sp->seg_number), "segment overwrite: blk size %d daddr %" PRIx64 " not in seg %d\n", bp->b_bcount, bp->b_blkno, sp->seg_number); #ifdef LFS_USE_BC_INVAL /* * Fake buffers from the cleaner are marked as BC_INVAL. * We need to copy the data from user space rather than * from the buffer indicated. * XXX == what do I do on an error? */ if ((bp->b_cflags & BC_INVAL) != 0 && bp->b_iodone != NULL) { if (copyin(bp->b_saveaddr, p, bp->b_bcount)) panic("lfs_writeseg: " "copyin failed [2]"); } else #endif /* LFS_USE_BC_INVAL */ if (cl->flags & LFS_CL_MALLOC) { /* copy data into our cluster. */ memcpy(p, bp->b_data, bp->b_bcount); p += bp->b_bcount; } cbp->b_bcount += bp->b_bcount; cl->bufsize += bp->b_bcount; bp->b_flags &= ~B_READ; bp->b_error = 0; cl->bpp[cl->bufcount++] = bp; vp = bp->b_vp; mutex_enter(&bufcache_lock); mutex_enter(vp->v_interlock); bp->b_oflags &= ~(BO_DELWRI | BO_DONE); reassignbuf(bp, vp); vp->v_numoutput++; mutex_exit(vp->v_interlock); mutex_exit(&bufcache_lock); bpp++; i--; } if (fs->lfs_sp->seg_flags & SEGM_SYNC) BIO_SETPRIO(cbp, BPRIO_TIMECRITICAL); else BIO_SETPRIO(cbp, BPRIO_TIMELIMITED); mutex_enter(devvp->v_interlock); devvp->v_numoutput++; mutex_exit(devvp->v_interlock); VOP_STRATEGY(devvp, cbp); curlwp->l_ru.ru_oublock++; } if (lfs_dostats) { ++lfs_stats.psegwrites; lfs_stats.blocktot += nblocks - 1; if (fs->lfs_sp->seg_flags & SEGM_SYNC) ++lfs_stats.psyncwrites; if (fs->lfs_sp->seg_flags & SEGM_CLEAN) { ++lfs_stats.pcleanwrites; lfs_stats.cleanblocks += nblocks - 1; } } return (lfs_initseg(fs) || do_again); } void lfs_writesuper(struct lfs *fs, daddr_t daddr) { struct buf *bp; struct vnode *devvp = VTOI(fs->lfs_ivnode)->i_devvp; ASSERT_MAYBE_SEGLOCK(fs); if (fs->lfs_is64) { KASSERT(fs->lfs_dlfs_u.u_64.dlfs_magic == LFS64_MAGIC); } else { KASSERT(fs->lfs_dlfs_u.u_32.dlfs_magic == LFS_MAGIC); } /* * If we can write one superblock while another is in * progress, we risk not having a complete checkpoint if we crash. * So, block here if a superblock write is in progress. */ mutex_enter(&lfs_lock); while (fs->lfs_sbactive) { mtsleep(&fs->lfs_sbactive, PRIBIO+1, "lfs sb", 0, &lfs_lock); } fs->lfs_sbactive = daddr; mutex_exit(&lfs_lock); /* Set timestamp of this version of the superblock */ if (lfs_sb_getversion(fs) == 1) lfs_sb_setotstamp(fs, time_second); lfs_sb_settstamp(fs, time_second); /* The next chunk of code relies on this assumption */ CTASSERT(sizeof(struct dlfs) == sizeof(struct dlfs64)); /* Checksum the superblock and copy it into a buffer. */ lfs_sb_setcksum(fs, lfs_sb_cksum(fs)); bp = lfs_newbuf(fs, devvp, LFS_FSBTODB(fs, daddr), LFS_SBPAD, LFS_NB_SBLOCK); memcpy(bp->b_data, &fs->lfs_dlfs_u, sizeof(struct dlfs)); memset((char *)bp->b_data + sizeof(struct dlfs), 0, LFS_SBPAD - sizeof(struct dlfs)); bp->b_cflags |= BC_BUSY; bp->b_flags = (bp->b_flags & ~B_READ) | B_ASYNC; bp->b_oflags &= ~(BO_DONE | BO_DELWRI); bp->b_error = 0; bp->b_iodone = lfs_supercallback; if (fs->lfs_sp != NULL && fs->lfs_sp->seg_flags & SEGM_SYNC) BIO_SETPRIO(bp, BPRIO_TIMECRITICAL); else BIO_SETPRIO(bp, BPRIO_TIMELIMITED); curlwp->l_ru.ru_oublock++; mutex_enter(devvp->v_interlock); devvp->v_numoutput++; mutex_exit(devvp->v_interlock); mutex_enter(&lfs_lock); ++fs->lfs_iocount; mutex_exit(&lfs_lock); VOP_STRATEGY(devvp, bp); } /* * Logical block number match routines used when traversing the dirty block * chain. */ int lfs_match_fake(struct lfs *fs, struct buf *bp) { ASSERT_SEGLOCK(fs); return LFS_IS_MALLOC_BUF(bp); } #if 0 int lfs_match_real(struct lfs *fs, struct buf *bp) { ASSERT_SEGLOCK(fs); return (lfs_match_data(fs, bp) && !lfs_match_fake(fs, bp)); } #endif int lfs_match_data(struct lfs *fs, struct buf *bp) { ASSERT_SEGLOCK(fs); return (bp->b_lblkno >= 0); } int lfs_match_indir(struct lfs *fs, struct buf *bp) { daddr_t lbn; ASSERT_SEGLOCK(fs); lbn = bp->b_lblkno; return (lbn < 0 && (-lbn - ULFS_NDADDR) % LFS_NINDIR(fs) == 0); } int lfs_match_dindir(struct lfs *fs, struct buf *bp) { daddr_t lbn; ASSERT_SEGLOCK(fs); lbn = bp->b_lblkno; return (lbn < 0 && (-lbn - ULFS_NDADDR) % LFS_NINDIR(fs) == 1); } int lfs_match_tindir(struct lfs *fs, struct buf *bp) { daddr_t lbn; ASSERT_SEGLOCK(fs); lbn = bp->b_lblkno; return (lbn < 0 && (-lbn - ULFS_NDADDR) % LFS_NINDIR(fs) == 2); } static void lfs_free_aiodone(struct buf *bp) { struct lfs *fs; KERNEL_LOCK(1, curlwp); fs = bp->b_private; ASSERT_NO_SEGLOCK(fs); lfs_freebuf(fs, bp); KERNEL_UNLOCK_LAST(curlwp); } static void lfs_super_aiodone(struct buf *bp) { struct lfs *fs; KERNEL_LOCK(1, curlwp); fs = bp->b_private; ASSERT_NO_SEGLOCK(fs); mutex_enter(&lfs_lock); fs->lfs_sbactive = 0; if (--fs->lfs_iocount <= 1) wakeup(&fs->lfs_iocount); wakeup(&fs->lfs_sbactive); mutex_exit(&lfs_lock); lfs_freebuf(fs, bp); KERNEL_UNLOCK_LAST(curlwp); } static void lfs_cluster_aiodone(struct buf *bp) { struct lfs_cluster *cl; struct lfs *fs; struct buf *tbp, *fbp; struct vnode *vp, *devvp, *ovp; struct inode *ip; int error; KERNEL_LOCK(1, curlwp); error = bp->b_error; cl = bp->b_private; fs = cl->fs; devvp = VTOI(fs->lfs_ivnode)->i_devvp; ASSERT_NO_SEGLOCK(fs); /* Put the pages back, and release the buffer */ while (cl->bufcount--) { tbp = cl->bpp[cl->bufcount]; KASSERT(tbp->b_cflags & BC_BUSY); if (error) { tbp->b_error = error; } /* * We're done with tbp. If it has not been re-dirtied since * the cluster was written, free it. Otherwise, keep it on * the locked list to be written again. */ vp = tbp->b_vp; tbp->b_flags &= ~B_GATHERED; #ifdef DEBUG if ((tbp)->b_vp == (fs)->lfs_ivnode) LFS_ENTER_LOG("clear", __FILE__, __LINE__, tbp->b_lblkno, tbp->b_flags, curproc->p_pid); #endif mutex_enter(&bufcache_lock); if (tbp->b_iodone == NULL) { KASSERT(tbp->b_flags & B_LOCKED); bremfree(tbp); if (vp) { mutex_enter(vp->v_interlock); reassignbuf(tbp, vp); mutex_exit(vp->v_interlock); } tbp->b_flags |= B_ASYNC; /* for biodone */ } if ((tbp->b_flags & B_LOCKED) && !(tbp->b_oflags & BO_DELWRI)) LFS_UNLOCK_BUF(tbp); if (tbp->b_oflags & BO_DONE) { DLOG((DLOG_SEG, "blk %d biodone already (flags %lx)\n", cl->bufcount, (long)tbp->b_flags)); } if (tbp->b_iodone != NULL && !LFS_IS_MALLOC_BUF(tbp)) { /* * A buffer from the page daemon. * We use the same iodone as it does, * so we must manually disassociate its * buffers from the vp. */ if ((ovp = tbp->b_vp) != NULL) { /* This is just silly */ mutex_enter(ovp->v_interlock); brelvp(tbp); mutex_exit(ovp->v_interlock); tbp->b_vp = vp; tbp->b_objlock = vp->v_interlock; } /* Put it back the way it was */ tbp->b_flags |= B_ASYNC; /* Master buffers have BC_AGE */ if (tbp->b_private == tbp) tbp->b_cflags |= BC_AGE; } mutex_exit(&bufcache_lock); biodone(tbp); /* * If this is the last block for this vnode, but * there are other blocks on its dirty list, * set IN_MODIFIED/IN_CLEANING depending on what * sort of block. Only do this for our mount point, * not for, e.g., inode blocks that are attached to * the devvp. * XXX KS - Shouldn't we set *both* if both types * of blocks are present (traverse the dirty list?) */ mutex_enter(vp->v_interlock); mutex_enter(&lfs_lock); if (vp != devvp && vp->v_numoutput == 0 && (fbp = LIST_FIRST(&vp->v_dirtyblkhd)) != NULL) { ip = VTOI(vp); DLOG((DLOG_SEG, "lfs_cluster_aiodone: mark ino %d\n", ip->i_number)); if (LFS_IS_MALLOC_BUF(fbp)) LFS_SET_UINO(ip, IN_CLEANING); else LFS_SET_UINO(ip, IN_MODIFIED); } cv_broadcast(&vp->v_cv); mutex_exit(&lfs_lock); mutex_exit(vp->v_interlock); } /* Fix up the cluster buffer, and release it */ if (cl->flags & LFS_CL_MALLOC) lfs_free(fs, bp->b_data, LFS_NB_CLUSTER); putiobuf(bp); /* Note i/o done */ if (cl->flags & LFS_CL_SYNC) { if (--cl->seg->seg_iocount == 0) wakeup(&cl->seg->seg_iocount); } mutex_enter(&lfs_lock); KASSERTMSG((fs->lfs_iocount != 0), "lfs_cluster_aiodone: zero iocount"); if (--fs->lfs_iocount <= 1) wakeup(&fs->lfs_iocount); mutex_exit(&lfs_lock); KERNEL_UNLOCK_LAST(curlwp); pool_put(&fs->lfs_bpppool, cl->bpp); cl->bpp = NULL; pool_put(&fs->lfs_clpool, cl); } static void lfs_generic_callback(struct buf *bp, void (*aiodone)(struct buf *)) { /* reset b_iodone for when this is a single-buf i/o. */ bp->b_iodone = aiodone; workqueue_enqueue(uvm.aiodone_queue, &bp->b_work, NULL); } static void lfs_cluster_callback(struct buf *bp) { lfs_generic_callback(bp, lfs_cluster_aiodone); } void lfs_supercallback(struct buf *bp) { lfs_generic_callback(bp, lfs_super_aiodone); } /* * The only buffers that are going to hit these functions are the * segment write blocks, or the segment summaries, or the superblocks. * * All of the above are created by lfs_newbuf, and so do not need to be * released via brelse. */ void lfs_callback(struct buf *bp) { lfs_generic_callback(bp, lfs_free_aiodone); } /* * Shellsort (diminishing increment sort) from Data Structures and * Algorithms, Aho, Hopcraft and Ullman, 1983 Edition, page 290; * see also Knuth Vol. 3, page 84. The increments are selected from * formula (8), page 95. Roughly O(N^3/2). */ /* * This is our own private copy of shellsort because we want to sort * two parallel arrays (the array of buffer pointers and the array of * logical block numbers) simultaneously. Note that we cast the array * of logical block numbers to a unsigned in this routine so that the * negative block numbers (meta data blocks) sort AFTER the data blocks. */ static void lfs_shellsort(struct lfs *fs, struct buf **bp_array, union lfs_blocks *lb_array, int nmemb, int size) { static int __rsshell_increments[] = { 4, 1, 0 }; int incr, *incrp, t1, t2; struct buf *bp_temp; #ifdef DEBUG incr = 0; for (t1 = 0; t1 < nmemb; t1++) { for (t2 = 0; t2 * size < bp_array[t1]->b_bcount; t2++) { if (lfs_blocks_get(fs, lb_array, incr++) != bp_array[t1]->b_lblkno + t2) { /* dump before panic */ printf("lfs_shellsort: nmemb=%d, size=%d\n", nmemb, size); incr = 0; for (t1 = 0; t1 < nmemb; t1++) { const struct buf *bp = bp_array[t1]; printf("bp[%d]: lbn=%" PRIu64 ", size=%" PRIu64 "\n", t1, (uint64_t)bp->b_bcount, (uint64_t)bp->b_lblkno); printf("lbns:"); for (t2 = 0; t2 * size < bp->b_bcount; t2++) { printf(" %jd", (intmax_t)lfs_blocks_get(fs, lb_array, incr++)); } printf("\n"); } panic("lfs_shellsort: inconsistent input"); } } } #endif for (incrp = __rsshell_increments; (incr = *incrp++) != 0;) for (t1 = incr; t1 < nmemb; ++t1) for (t2 = t1 - incr; t2 >= 0;) if ((u_int64_t)bp_array[t2]->b_lblkno > (u_int64_t)bp_array[t2 + incr]->b_lblkno) { bp_temp = bp_array[t2]; bp_array[t2] = bp_array[t2 + incr]; bp_array[t2 + incr] = bp_temp; t2 -= incr; } else break; /* Reform the list of logical blocks */ incr = 0; for (t1 = 0; t1 < nmemb; t1++) { for (t2 = 0; t2 * size < bp_array[t1]->b_bcount; t2++) { lfs_blocks_set(fs, lb_array, incr++, bp_array[t1]->b_lblkno + t2); } } } /* * Set up an FINFO entry for a new file. The fip pointer is assumed to * point at uninitialized space. */ void lfs_acquire_finfo(struct lfs *fs, ino_t ino, int vers) { struct segment *sp = fs->lfs_sp; SEGSUM *ssp; KASSERT(vers > 0); if (sp->seg_bytes_left < lfs_sb_getbsize(fs) || sp->sum_bytes_left < FINFOSIZE(fs) + LFS_BLKPTRSIZE(fs)) (void) lfs_writeseg(fs, fs->lfs_sp); sp->sum_bytes_left -= FINFOSIZE(fs); ssp = (SEGSUM *)sp->segsum; lfs_ss_setnfinfo(fs, ssp, lfs_ss_getnfinfo(fs, ssp) + 1); lfs_fi_setnblocks(fs, sp->fip, 0); lfs_fi_setino(fs, sp->fip, ino); lfs_fi_setversion(fs, sp->fip, vers); } /* * Release the FINFO entry, either clearing out an unused entry or * advancing us to the next available entry. */ void lfs_release_finfo(struct lfs *fs) { struct segment *sp = fs->lfs_sp; SEGSUM *ssp; if (lfs_fi_getnblocks(fs, sp->fip) != 0) { sp->fip = NEXT_FINFO(fs, sp->fip); lfs_blocks_fromfinfo(fs, &sp->start_lbp, sp->fip); } else { /* XXX shouldn't this update sp->fip? */ sp->sum_bytes_left += FINFOSIZE(fs); ssp = (SEGSUM *)sp->segsum; lfs_ss_setnfinfo(fs, ssp, lfs_ss_getnfinfo(fs, ssp) - 1); } }