/* $NetBSD: lfs_syscalls.c,v 1.114 2006/06/07 22:34:43 kardel 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. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the NetBSD * Foundation, Inc. and its contributors. * 4. Neither the name of The NetBSD Foundation 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 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, 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. 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 8.10 (Berkeley) 5/14/95 */ #include __KERNEL_RCSID(0, "$NetBSD: lfs_syscalls.c,v 1.114 2006/06/07 22:34:43 kardel Exp $"); #ifndef LFS # define LFS /* for prototypes in syscallargs.h */ #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include struct buf *lfs_fakebuf(struct lfs *, struct vnode *, int, size_t, caddr_t); int lfs_fasthashget(dev_t, ino_t, struct vnode **); pid_t lfs_cleaner_pid = 0; /* * sys_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. */ #ifdef USE_64BIT_SYSCALLS int sys_lfs_markv(struct lwp *l, void *v, register_t *retval) { struct sys_lfs_markv_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct block_info *) blkiov; syscallarg(int) blkcnt; } */ *uap = v; BLOCK_INFO *blkiov; struct proc *p = l->l_proc; int blkcnt, error; fsid_t fsid; struct lfs *fs; struct mount *mntp; if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) return (error); if ((error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) != 0) return (error); if ((mntp = vfs_getvfs(fsidp)) == NULL) return (ENOENT); fs = VFSTOUFS(mntp)->um_lfs; blkcnt = SCARG(uap, blkcnt); if ((u_int) blkcnt > LFS_MARKV_MAXBLKCNT) return (EINVAL); blkiov = lfs_malloc(fs, blkcnt * sizeof(BLOCK_INFO), LFS_NB_BLKIOV); if ((error = copyin(SCARG(uap, blkiov), blkiov, blkcnt * sizeof(BLOCK_INFO))) != 0) goto out; if ((error = lfs_markv(p, &fsid, blkiov, blkcnt)) == 0) copyout(blkiov, SCARG(uap, blkiov), blkcnt * sizeof(BLOCK_INFO)); out: lfs_free(fs, blkiov, LFS_NB_BLKIOV); return error; } #else int sys_lfs_markv(struct lwp *l, void *v, register_t *retval) { struct sys_lfs_markv_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct block_info *) blkiov; syscallarg(int) blkcnt; } */ *uap = v; BLOCK_INFO *blkiov; BLOCK_INFO_15 *blkiov15; struct proc *p = l->l_proc; int i, blkcnt, error; fsid_t fsid; struct lfs *fs; struct mount *mntp; if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) return (error); if ((error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) != 0) return (error); if ((mntp = vfs_getvfs(&fsid)) == NULL) return (ENOENT); fs = VFSTOUFS(mntp)->um_lfs; blkcnt = SCARG(uap, blkcnt); if ((u_int) blkcnt > LFS_MARKV_MAXBLKCNT) return (EINVAL); blkiov = lfs_malloc(fs, blkcnt * sizeof(BLOCK_INFO), LFS_NB_BLKIOV); blkiov15 = lfs_malloc(fs, blkcnt * sizeof(BLOCK_INFO_15), LFS_NB_BLKIOV); if ((error = copyin(SCARG(uap, blkiov), blkiov15, blkcnt * sizeof(BLOCK_INFO_15))) != 0) goto out; for (i = 0; i < blkcnt; i++) { blkiov[i].bi_inode = blkiov15[i].bi_inode; blkiov[i].bi_lbn = blkiov15[i].bi_lbn; blkiov[i].bi_daddr = blkiov15[i].bi_daddr; blkiov[i].bi_segcreate = blkiov15[i].bi_segcreate; blkiov[i].bi_version = blkiov15[i].bi_version; blkiov[i].bi_bp = blkiov15[i].bi_bp; blkiov[i].bi_size = blkiov15[i].bi_size; } if ((error = lfs_markv(p, &fsid, blkiov, blkcnt)) == 0) { for (i = 0; i < blkcnt; i++) { blkiov15[i].bi_inode = blkiov[i].bi_inode; blkiov15[i].bi_lbn = blkiov[i].bi_lbn; blkiov15[i].bi_daddr = blkiov[i].bi_daddr; blkiov15[i].bi_segcreate = blkiov[i].bi_segcreate; blkiov15[i].bi_version = blkiov[i].bi_version; blkiov15[i].bi_bp = blkiov[i].bi_bp; blkiov15[i].bi_size = blkiov[i].bi_size; } copyout(blkiov15, SCARG(uap, blkiov), blkcnt * sizeof(BLOCK_INFO_15)); } out: lfs_free(fs, blkiov, LFS_NB_BLKIOV); lfs_free(fs, blkiov15, LFS_NB_BLKIOV); return error; } #endif #define LFS_MARKV_MAX_BLOCKS (LFS_MAX_BUFS) int lfs_markv(struct proc *p, fsid_t *fsidp, BLOCK_INFO *blkiov, int blkcnt) { BLOCK_INFO *blkp; IFILE *ifp; struct buf *bp; struct inode *ip = NULL; struct lfs *fs; struct mount *mntp; struct vnode *vp = NULL; ino_t lastino; daddr_t b_daddr, v_daddr; int cnt, error; int do_again = 0; int numrefed = 0; ino_t maxino; size_t obsize; /* number of blocks/inodes that we have already bwrite'ed */ int nblkwritten, ninowritten; if ((mntp = vfs_getvfs(fsidp)) == NULL) return (ENOENT); fs = VFSTOUFS(mntp)->um_lfs; if (fs->lfs_ronly) return EROFS; maxino = (fragstoblks(fs, fsbtofrags(fs, VTOI(fs->lfs_ivnode)->i_ffs1_blocks)) - fs->lfs_cleansz - fs->lfs_segtabsz) * fs->lfs_ifpb; cnt = blkcnt; if ((error = vfs_busy(mntp, LK_NOWAIT, NULL)) != 0) return (error); /* * This seglock is just to prevent the fact that we might have to sleep * from allowing the possibility that our blocks might become * invalid. * * It is also important to note here that unless we specify SEGM_CKP, * any Ifile blocks that we might be asked to clean will never get * to the disk. */ lfs_seglock(fs, SEGM_CLEAN | SEGM_CKP | SEGM_SYNC); /* Mark blocks/inodes dirty. */ error = 0; /* these were inside the initialization for the for loop */ v_daddr = LFS_UNUSED_DADDR; lastino = LFS_UNUSED_INUM; nblkwritten = ninowritten = 0; for (blkp = blkiov; cnt--; ++blkp) { /* Bounds-check incoming data, avoid panic for failed VGET */ if (blkp->bi_inode <= 0 || blkp->bi_inode >= maxino) { error = EINVAL; goto err3; } /* * Get the IFILE entry (only once) and see if the file still * exists. */ if (lastino != blkp->bi_inode) { /* * Finish the old file, if there was one. The presence * of a usable vnode in vp is signaled by a valid v_daddr. */ if (v_daddr != LFS_UNUSED_DADDR) { lfs_vunref(vp); numrefed--; } /* * Start a new file */ 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); /* XXX fix for force write */ v_daddr = ifp->if_daddr; brelse(bp); } if (v_daddr == LFS_UNUSED_DADDR) continue; /* Get the vnode/inode. */ error = lfs_fastvget(mntp, blkp->bi_inode, v_daddr, &vp, (blkp->bi_lbn == LFS_UNUSED_LBN ? blkp->bi_bp : NULL)); if (!error) { numrefed++; } if (error) { DLOG((DLOG_CLEAN, "lfs_markv: lfs_fastvget" " failed with %d (ino %d, segment %d)\n", error, blkp->bi_inode, dtosn(fs, blkp->bi_daddr))); /* * If we got EAGAIN, that means that the * Inode was locked. This is * recoverable: just clean the rest of * this segment, and let the cleaner try * again with another. (When the * cleaner runs again, this segment will * sort high on the list, since it is * now almost entirely empty.) But, we * still set v_daddr = LFS_UNUSED_ADDR * so as not to test this over and over * again. */ if (error == EAGAIN) { error = 0; do_again++; } #ifdef DIAGNOSTIC else if (error != ENOENT) panic("lfs_markv VFS_VGET FAILED"); #endif /* lastino = LFS_UNUSED_INUM; */ v_daddr = LFS_UNUSED_DADDR; vp = NULL; ip = NULL; continue; } ip = VTOI(vp); ninowritten++; } else if (v_daddr == LFS_UNUSED_DADDR) { /* * This can only happen if the vnode is dead (or * in any case we can't get it...e.g., it is * inlocked). Keep going. */ continue; } /* Past this point we are guaranteed that vp, ip are valid. */ /* If this BLOCK_INFO didn't contain a block, keep going. */ if (blkp->bi_lbn == LFS_UNUSED_LBN) { /* XXX need to make sure that the inode gets written in this case */ /* XXX but only write the inode if it's the right one */ if (blkp->bi_inode != LFS_IFILE_INUM) { LFS_IENTRY(ifp, fs, blkp->bi_inode, bp); if (ifp->if_daddr == blkp->bi_daddr) LFS_SET_UINO(ip, IN_CLEANING); brelse(bp); } continue; } b_daddr = 0; if (VOP_BMAP(vp, blkp->bi_lbn, NULL, &b_daddr, NULL) || dbtofsb(fs, b_daddr) != blkp->bi_daddr) { if (dtosn(fs, dbtofsb(fs, b_daddr)) == dtosn(fs, blkp->bi_daddr)) { DLOG((DLOG_CLEAN, "lfs_markv: wrong da same seg: %llx vs %llx\n", (long long)blkp->bi_daddr, (long long)dbtofsb(fs, b_daddr))); } do_again++; continue; } /* * Check block sizes. The blocks being cleaned come from * disk, so they should have the same size as their on-disk * counterparts. */ if (blkp->bi_lbn >= 0) obsize = blksize(fs, ip, blkp->bi_lbn); else obsize = fs->lfs_bsize; /* Check for fragment size change */ if (blkp->bi_lbn >= 0 && blkp->bi_lbn < NDADDR) { obsize = ip->i_lfs_fragsize[blkp->bi_lbn]; } if (obsize != blkp->bi_size) { DLOG((DLOG_CLEAN, "lfs_markv: ino %d lbn %lld wrong" " size (%ld != %d), try again\n", blkp->bi_inode, (long long)blkp->bi_lbn, (long) obsize, blkp->bi_size)); do_again++; continue; } /* * If we get 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 (ip->i_number != LFS_IFILE_INUM && blkp->bi_lbn >= 0) { /* Data Block */ bp = lfs_fakebuf(fs, vp, blkp->bi_lbn, blkp->bi_size, blkp->bi_bp); /* Pretend we used bread() to get it */ bp->b_blkno = fsbtodb(fs, blkp->bi_daddr); } else { /* Indirect block or ifile */ if (blkp->bi_size != fs->lfs_bsize && ip->i_number != LFS_IFILE_INUM) panic("lfs_markv: partial indirect block?" " size=%d\n", blkp->bi_size); bp = getblk(vp, blkp->bi_lbn, blkp->bi_size, 0, 0); if (!(bp->b_flags & (B_DONE|B_DELWRI))) { /* B_CACHE */ /* * The block in question was not found * in the cache; i.e., the block that * getblk() returned is empty. So, we * can (and should) copy in the * contents, because we've already * determined that this was the right * version of this block on disk. * * And, it can't have changed underneath * us, because we have the segment lock. */ error = copyin(blkp->bi_bp, bp->b_data, blkp->bi_size); if (error) goto err2; } } if ((error = lfs_bwrite_ext(bp, BW_CLEAN)) != 0) goto err2; nblkwritten++; /* * XXX should account indirect blocks and ifile pages as well */ if (nblkwritten + lblkno(fs, ninowritten * sizeof (struct ufs1_dinode)) > LFS_MARKV_MAX_BLOCKS) { DLOG((DLOG_CLEAN, "lfs_markv: writing %d blks %d inos\n", nblkwritten, ninowritten)); lfs_segwrite(mntp, SEGM_CLEAN); nblkwritten = ninowritten = 0; } } /* * Finish the old file, if there was one */ if (v_daddr != LFS_UNUSED_DADDR) { lfs_vunref(vp); numrefed--; } #ifdef DIAGNOSTIC if (numrefed != 0) panic("lfs_markv: numrefed=%d", numrefed); #endif DLOG((DLOG_CLEAN, "lfs_markv: writing %d blks %d inos (check point)\n", nblkwritten, ninowritten)); /* * The last write has to be SEGM_SYNC, because of calling semantics. * It also has to be SEGM_CKP, because otherwise we could write * over the newly cleaned data contained in a checkpoint, and then * we'd be unhappy at recovery time. */ lfs_segwrite(mntp, SEGM_CLEAN | SEGM_CKP | SEGM_SYNC); lfs_segunlock(fs); vfs_unbusy(mntp); if (error) return (error); else if (do_again) return EAGAIN; return 0; err2: DLOG((DLOG_CLEAN, "lfs_markv err2\n")); /* * XXX we're here because copyin() failed. * XXX it means that we can't trust the cleanerd. too bad. * XXX how can we recover from this? */ err3: /* * XXX should do segwrite here anyway? */ if (v_daddr != LFS_UNUSED_DADDR) { lfs_vunref(vp); --numrefed; } lfs_segunlock(fs); vfs_unbusy(mntp); #ifdef DIAGNOSTIC if (numrefed != 0) panic("lfs_markv: numrefed=%d", numrefed); #endif return (error); } /* * sys_lfs_bmapv: * * This will fill in the current disk address for arrays of blocks. * * 0 on success * -1/errno is return on error. */ #ifdef USE_64BIT_SYSCALLS int sys_lfs_bmapv(struct lwp *l, void *v, register_t *retval) { struct sys_lfs_bmapv_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct block_info *) blkiov; syscallarg(int) blkcnt; } */ *uap = v; struct proc *p = l->l_proc; BLOCK_INFO *blkiov; int blkcnt, error; fsid_t fsid; struct lfs *fs; struct mount *mntp; if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) return (error); if ((error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) != 0) return (error); if ((mntp = vfs_getvfs(&fsid)) == NULL) return (ENOENT); fs = VFSTOUFS(mntp)->um_lfs; blkcnt = SCARG(uap, blkcnt); if ((u_int) blkcnt > SIZE_T_MAX / sizeof(BLOCK_INFO)) return (EINVAL); blkiov = lfs_malloc(fs, blkcnt * sizeof(BLOCK_INFO), LFS_NB_BLKIOV); if ((error = copyin(SCARG(uap, blkiov), blkiov, blkcnt * sizeof(BLOCK_INFO))) != 0) goto out; if ((error = lfs_bmapv(p, &fsid, blkiov, blkcnt)) == 0) copyout(blkiov, SCARG(uap, blkiov), blkcnt * sizeof(BLOCK_INFO)); out: lfs_free(fs, blkiov, LFS_NB_BLKIOV); return error; } #else int sys_lfs_bmapv(struct lwp *l, void *v, register_t *retval) { struct sys_lfs_bmapv_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct block_info *) blkiov; syscallarg(int) blkcnt; } */ *uap = v; struct proc *p = l->l_proc; BLOCK_INFO *blkiov; BLOCK_INFO_15 *blkiov15; int i, blkcnt, error; fsid_t fsid; struct lfs *fs; struct mount *mntp; if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) return (error); if ((error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) != 0) return (error); if ((mntp = vfs_getvfs(&fsid)) == NULL) return (ENOENT); fs = VFSTOUFS(mntp)->um_lfs; blkcnt = SCARG(uap, blkcnt); if ((size_t) blkcnt > SIZE_T_MAX / sizeof(BLOCK_INFO)) return (EINVAL); blkiov = lfs_malloc(fs, blkcnt * sizeof(BLOCK_INFO), LFS_NB_BLKIOV); blkiov15 = lfs_malloc(fs, blkcnt * sizeof(BLOCK_INFO_15), LFS_NB_BLKIOV); if ((error = copyin(SCARG(uap, blkiov), blkiov15, blkcnt * sizeof(BLOCK_INFO_15))) != 0) goto out; for (i = 0; i < blkcnt; i++) { blkiov[i].bi_inode = blkiov15[i].bi_inode; blkiov[i].bi_lbn = blkiov15[i].bi_lbn; blkiov[i].bi_daddr = blkiov15[i].bi_daddr; blkiov[i].bi_segcreate = blkiov15[i].bi_segcreate; blkiov[i].bi_version = blkiov15[i].bi_version; blkiov[i].bi_bp = blkiov15[i].bi_bp; blkiov[i].bi_size = blkiov15[i].bi_size; } if ((error = lfs_bmapv(p, &fsid, blkiov, blkcnt)) == 0) { for (i = 0; i < blkcnt; i++) { blkiov15[i].bi_inode = blkiov[i].bi_inode; blkiov15[i].bi_lbn = blkiov[i].bi_lbn; blkiov15[i].bi_daddr = blkiov[i].bi_daddr; blkiov15[i].bi_segcreate = blkiov[i].bi_segcreate; blkiov15[i].bi_version = blkiov[i].bi_version; blkiov15[i].bi_bp = blkiov[i].bi_bp; blkiov15[i].bi_size = blkiov[i].bi_size; } copyout(blkiov15, SCARG(uap, blkiov), blkcnt * sizeof(BLOCK_INFO_15)); } out: lfs_free(fs, blkiov, LFS_NB_BLKIOV); lfs_free(fs, blkiov15, LFS_NB_BLKIOV); return error; } #endif int lfs_bmapv(struct proc *p, fsid_t *fsidp, BLOCK_INFO *blkiov, int blkcnt) { BLOCK_INFO *blkp; IFILE *ifp; struct buf *bp; struct inode *ip = NULL; struct lfs *fs; struct mount *mntp; struct ufsmount *ump; struct vnode *vp; ino_t lastino; daddr_t v_daddr; int cnt, error; int numrefed = 0; lfs_cleaner_pid = p->p_pid; if ((mntp = vfs_getvfs(fsidp)) == NULL) return (ENOENT); ump = VFSTOUFS(mntp); if ((error = vfs_busy(mntp, LK_NOWAIT, NULL)) != 0) return (error); cnt = blkcnt; fs = VFSTOUFS(mntp)->um_lfs; error = 0; /* these were inside the initialization for the for loop */ v_daddr = LFS_UNUSED_DADDR; lastino = LFS_UNUSED_INUM; for (blkp = blkiov; cnt--; ++blkp) { /* * Get the IFILE entry (only once) and see if the file still * exists. */ if (lastino != blkp->bi_inode) { /* * Finish the old file, if there was one. The presence * of a usable vnode in vp is signaled by a valid * v_daddr. */ if (v_daddr != LFS_UNUSED_DADDR) { lfs_vunref(vp); numrefed--; } /* * Start a new file */ 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) { blkp->bi_daddr = LFS_UNUSED_DADDR; continue; } /* * A regular call to VFS_VGET could deadlock * here. Instead, we try an unlocked access. */ vp = ufs_ihashlookup(ump->um_dev, blkp->bi_inode); if (vp != NULL && !(vp->v_flag & VXLOCK)) { ip = VTOI(vp); if (lfs_vref(vp)) { v_daddr = LFS_UNUSED_DADDR; continue; } numrefed++; } else { /* * Don't VFS_VGET if we're being unmounted, * since we hold vfs_busy(). */ if (mntp->mnt_iflag & IMNT_UNMOUNT) { v_daddr = LFS_UNUSED_DADDR; continue; } error = VFS_VGET(mntp, blkp->bi_inode, &vp); if (error) { DLOG((DLOG_CLEAN, "lfs_bmapv: vget ino" "%d failed with %d", blkp->bi_inode,error)); v_daddr = LFS_UNUSED_DADDR; continue; } else { KASSERT(VOP_ISLOCKED(vp)); VOP_UNLOCK(vp, 0); numrefed++; } } ip = VTOI(vp); } else if (v_daddr == LFS_UNUSED_DADDR) { /* * This can only happen if the vnode is dead. * Keep going. Note that we DO NOT set the * bi_addr to anything -- if we failed to get * the vnode, for example, we want to assume * conservatively that all of its blocks *are* * located in the segment in question. * lfs_markv will throw them out if we are * wrong. */ /* blkp->bi_daddr = LFS_UNUSED_DADDR; */ continue; } /* Past this point we are guaranteed that vp, ip are valid. */ if (blkp->bi_lbn == LFS_UNUSED_LBN) { /* * We just want the inode address, which is * conveniently in v_daddr. */ blkp->bi_daddr = v_daddr; } else { daddr_t bi_daddr; /* XXX ondisk32 */ error = VOP_BMAP(vp, blkp->bi_lbn, NULL, &bi_daddr, NULL); if (error) { blkp->bi_daddr = LFS_UNUSED_DADDR; continue; } blkp->bi_daddr = dbtofsb(fs, bi_daddr); /* Fill in the block size, too */ if (blkp->bi_lbn >= 0) blkp->bi_size = blksize(fs, ip, blkp->bi_lbn); else blkp->bi_size = fs->lfs_bsize; } } /* * Finish the old file, if there was one. The presence * of a usable vnode in vp is signaled by a valid v_daddr. */ if (v_daddr != LFS_UNUSED_DADDR) { lfs_vunref(vp); numrefed--; } #ifdef DIAGNOSTIC if (numrefed != 0) panic("lfs_bmapv: numrefed=%d", numrefed); #endif vfs_unbusy(mntp); return 0; } /* * sys_lfs_segclean: * * Mark the segment clean. * * 0 on success * -1/errno is return on error. */ int sys_lfs_segclean(struct lwp *l, void *v, register_t *retval) { struct sys_lfs_segclean_args /* { syscallarg(fsid_t *) fsidp; syscallarg(u_long) segment; } */ *uap = v; struct lfs *fs; struct mount *mntp; fsid_t fsid; int error; unsigned long segnum; struct proc *p = l->l_proc; if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) return (error); if ((error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) != 0) return (error); if ((mntp = vfs_getvfs(&fsid)) == NULL) return (ENOENT); fs = VFSTOUFS(mntp)->um_lfs; segnum = SCARG(uap, segment); if ((error = vfs_busy(mntp, LK_NOWAIT, NULL)) != 0) return (error); lfs_seglock(fs, SEGM_PROT); error = lfs_do_segclean(fs, segnum); lfs_segunlock(fs); vfs_unbusy(mntp); return error; } /* * Actually mark the segment clean. * Must be called with the segment lock held. */ int lfs_do_segclean(struct lfs *fs, unsigned long segnum) { extern int lfs_dostats; struct buf *bp; CLEANERINFO *cip; SEGUSE *sup; if (dtosn(fs, fs->lfs_curseg) == segnum) { return (EBUSY); } LFS_SEGENTRY(sup, fs, segnum, bp); if (sup->su_nbytes) { DLOG((DLOG_CLEAN, "lfs_segclean: not cleaning segment %lu:" " %d live bytes\n", segnum, sup->su_nbytes)); brelse(bp); return (EBUSY); } if (sup->su_flags & SEGUSE_ACTIVE) { DLOG((DLOG_CLEAN, "lfs_segclean: not cleaning segment %lu:" " segment is active\n", segnum)); brelse(bp); return (EBUSY); } if (!(sup->su_flags & SEGUSE_DIRTY)) { DLOG((DLOG_CLEAN, "lfs_segclean: not cleaning segment %lu:" " segment is already clean\n", segnum)); brelse(bp); return (EALREADY); } fs->lfs_avail += segtod(fs, 1); if (sup->su_flags & SEGUSE_SUPERBLOCK) fs->lfs_avail -= btofsb(fs, LFS_SBPAD); if (fs->lfs_version > 1 && segnum == 0 && fs->lfs_start < btofsb(fs, LFS_LABELPAD)) fs->lfs_avail -= btofsb(fs, LFS_LABELPAD) - fs->lfs_start; simple_lock(&fs->lfs_interlock); fs->lfs_bfree += sup->su_nsums * btofsb(fs, fs->lfs_sumsize) + btofsb(fs, sup->su_ninos * fs->lfs_ibsize); fs->lfs_dmeta -= sup->su_nsums * btofsb(fs, fs->lfs_sumsize) + btofsb(fs, sup->su_ninos * fs->lfs_ibsize); if (fs->lfs_dmeta < 0) fs->lfs_dmeta = 0; simple_unlock(&fs->lfs_interlock); sup->su_flags &= ~SEGUSE_DIRTY; LFS_WRITESEGENTRY(sup, fs, segnum, bp); LFS_CLEANERINFO(cip, fs, bp); ++cip->clean; --cip->dirty; fs->lfs_nclean = cip->clean; cip->bfree = fs->lfs_bfree; simple_lock(&fs->lfs_interlock); cip->avail = fs->lfs_avail - fs->lfs_ravail - fs->lfs_favail; wakeup(&fs->lfs_avail); simple_unlock(&fs->lfs_interlock); (void) LFS_BWRITE_LOG(bp); if (lfs_dostats) ++lfs_stats.segs_reclaimed; return (0); } /* * 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. */ int lfs_segwait(fsid_t *fsidp, struct timeval *tv) { struct mount *mntp; void *addr; u_long timeout; int error; if (fsidp == NULL || (mntp = vfs_getvfs(fsidp)) == NULL) addr = &lfs_allclean_wakeup; else addr = &VFSTOUFS(mntp)->um_lfs->lfs_nextseg; /* * XXX THIS COULD SLEEP FOREVER IF TIMEOUT IS {0,0}! * XXX IS THAT WHAT IS INTENDED? */ timeout = tvtohz(tv); error = tsleep(addr, PCATCH | PVFS, "segment", timeout); return (error == ERESTART ? EINTR : 0); } /* * sys_lfs_segwait: * * System call wrapper around lfs_segwait(). * * 0 on success * 1 on timeout * -1/errno is return on error. */ int sys_lfs_segwait(struct lwp *l, void *v, register_t *retval) { struct sys_lfs_segwait_args /* { syscallarg(fsid_t *) fsidp; syscallarg(struct timeval *) tv; } */ *uap = v; struct proc *p = l->l_proc; struct timeval atv; fsid_t fsid; int error; /* XXX need we be su to segwait? */ if ((error = kauth_authorize_generic(p->p_cred, KAUTH_GENERIC_ISSUSER, &p->p_acflag)) != 0) { return (error); } if ((error = copyin(SCARG(uap, fsidp), &fsid, sizeof(fsid_t))) != 0) return (error); if (SCARG(uap, tv)) { error = copyin(SCARG(uap, tv), &atv, sizeof(struct timeval)); if (error) return (error); if (itimerfix(&atv)) return (EINVAL); } else /* NULL or invalid */ atv.tv_sec = atv.tv_usec = 0; return lfs_segwait(&fsid, &atv); } /* * 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. * * we lfs_vref, and it is the caller's responsibility to lfs_vunref * when finished. */ extern struct lock ufs_hashlock; int lfs_fasthashget(dev_t dev, ino_t ino, struct vnode **vpp) { if ((*vpp = ufs_ihashlookup(dev, ino)) != NULL) { if ((*vpp)->v_flag & VXLOCK) { DLOG((DLOG_CLEAN, "lfs_fastvget: ino %d VXLOCK\n", ino)); lfs_stats.clean_vnlocked++; return EAGAIN; } if (lfs_vref(*vpp)) { DLOG((DLOG_CLEAN, "lfs_fastvget: lfs_vref failed" " for ino %d\n", ino)); lfs_stats.clean_inlocked++; return EAGAIN; } } else *vpp = NULL; return (0); } int lfs_fastvget(struct mount *mp, ino_t ino, daddr_t daddr, struct vnode **vpp, struct ufs1_dinode *dinp) { struct inode *ip; struct ufs1_dinode *dip; struct vnode *vp; struct ufsmount *ump; dev_t dev; int error, retries; struct buf *bp; struct lfs *fs; ump = VFSTOUFS(mp); dev = ump->um_dev; fs = ump->um_lfs; /* * Wait until the filesystem is fully mounted before allowing vget * to complete. This prevents possible problems with roll-forward. */ simple_lock(&fs->lfs_interlock); while (fs->lfs_flags & LFS_NOTYET) { ltsleep(&fs->lfs_flags, PRIBIO+1, "lfs_fnotyet", 0, &fs->lfs_interlock); } simple_unlock(&fs->lfs_interlock); /* * 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. */ error = lfs_fasthashget(dev, ino, vpp); if (error != 0 || *vpp != NULL) return (error); /* * getnewvnode(9) will call vfs_busy, which will block if the * filesystem is being unmounted; but umount(9) is waiting for * us because we're already holding the fs busy. * XXXMP */ if (mp->mnt_iflag & IMNT_UNMOUNT) { *vpp = NULL; return EDEADLK; } if ((error = getnewvnode(VT_LFS, mp, lfs_vnodeop_p, &vp)) != 0) { *vpp = NULL; return (error); } do { error = lfs_fasthashget(dev, ino, vpp); if (error != 0 || *vpp != NULL) { ungetnewvnode(vp); return (error); } } while (lockmgr(&ufs_hashlock, LK_EXCLUSIVE|LK_SLEEPFAIL, 0)); /* Allocate new vnode/inode. */ lfs_vcreate(mp, ino, vp); /* * 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); lockmgr(&ufs_hashlock, LK_RELEASE, 0); /* * XXX * This may not need to be here, logically it should go down with * the i_devvp initialization. * Ask Kirk. */ ip->i_lfs = fs; /* Read in the disk contents for the inode, copy into the inode. */ if (dinp) { error = copyin(dinp, ip->i_din.ffs1_din, sizeof (struct ufs1_dinode)); if (error) { DLOG((DLOG_CLEAN, "lfs_fastvget: dinode copyin failed" " for ino %d\n", ino)); ufs_ihashrem(ip); /* Unlock and discard unneeded inode. */ lockmgr(&vp->v_lock, LK_RELEASE, &vp->v_interlock); lfs_vunref(vp); *vpp = NULL; return (error); } if (ip->i_number != ino) panic("lfs_fastvget: I was fed the wrong inode!"); } else { retries = 0; again: error = bread(ump->um_devvp, fsbtodb(fs, daddr), fs->lfs_ibsize, NOCRED, &bp); if (error) { DLOG((DLOG_CLEAN, "lfs_fastvget: bread failed (%d)\n", error)); /* * 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. */ lockmgr(&vp->v_lock, LK_RELEASE, &vp->v_interlock); lfs_vunref(vp); brelse(bp); *vpp = NULL; return (error); } dip = lfs_ifind(ump->um_lfs, ino, bp); if (dip == NULL) { /* Assume write has not completed yet; try again */ bp->b_flags |= B_INVAL; brelse(bp); ++retries; if (retries > LFS_IFIND_RETRIES) panic("lfs_fastvget: dinode not found"); DLOG((DLOG_CLEAN, "lfs_fastvget: dinode not found," " retrying...\n")); goto again; } *ip->i_din.ffs1_din = *dip; brelse(bp); } lfs_vinit(mp, &vp); *vpp = vp; KASSERT(VOP_ISLOCKED(vp)); VOP_UNLOCK(vp, 0); return (0); } /* * Make up a "fake" cleaner buffer, copy the data from userland into it. */ struct buf * lfs_fakebuf(struct lfs *fs, struct vnode *vp, int lbn, size_t size, caddr_t uaddr) { struct buf *bp; int error; KASSERT(VTOI(vp)->i_number != LFS_IFILE_INUM); bp = lfs_newbuf(VTOI(vp)->i_lfs, vp, lbn, size, LFS_NB_CLEAN); error = copyin(uaddr, bp->b_data, size); if (error) { lfs_freebuf(fs, bp); return NULL; } KDASSERT(bp->b_iodone == lfs_callback); #if 0 simple_lock(&fs->lfs_interlock); ++fs->lfs_iocount; simple_unlock(&fs->lfs_interlock); #endif bp->b_bufsize = size; bp->b_bcount = size; return (bp); }