/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)mfs_vnops.c 8.11 (Berkeley) 5/22/95 * $FreeBSD: src/sys/ufs/mfs/mfs_vnops.c,v 1.47.2.1 2001/05/22 02:06:43 bp Exp $ * $DragonFly: src/sys/vfs/mfs/mfs_vnops.c,v 1.13 2004/05/19 22:53:04 dillon Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include "mfsnode.h" #include "mfs_extern.h" static int mfs_badop (struct vop_generic_args *); static int mfs_bmap (struct vop_bmap_args *); static int mfs_close (struct vop_close_args *); static int mfs_fsync (struct vop_fsync_args *); static int mfs_freeblks (struct vop_freeblks_args *); static int mfs_inactive (struct vop_inactive_args *); /* XXX */ static int mfs_open (struct vop_open_args *); static int mfs_reclaim (struct vop_reclaim_args *); /* XXX */ static int mfs_print (struct vop_print_args *); /* XXX */ static int mfs_strategy (struct vop_strategy_args *); /* XXX */ static int mfs_getpages (struct vop_getpages_args *); /* XXX */ /* * mfs vnode operations. */ vop_t **mfs_vnodeop_p; static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = { { &vop_default_desc, (vop_t *) mfs_badop }, { &vop_bmap_desc, (vop_t *) mfs_bmap }, { &vop_bwrite_desc, (vop_t *) vop_defaultop }, { &vop_close_desc, (vop_t *) mfs_close }, { &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject }, { &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject }, { &vop_freeblks_desc, (vop_t *) mfs_freeblks }, { &vop_fsync_desc, (vop_t *) mfs_fsync }, { &vop_getpages_desc, (vop_t *) mfs_getpages }, { &vop_getvobject_desc, (vop_t *) vop_stdgetvobject }, { &vop_inactive_desc, (vop_t *) mfs_inactive }, { &vop_ioctl_desc, (vop_t *) vop_enotty }, { &vop_islocked_desc, (vop_t *) vop_defaultop }, { &vop_lock_desc, (vop_t *) vop_defaultop }, { &vop_open_desc, (vop_t *) mfs_open }, { &vop_print_desc, (vop_t *) mfs_print }, { &vop_reclaim_desc, (vop_t *) mfs_reclaim }, { &vop_strategy_desc, (vop_t *) mfs_strategy }, { &vop_unlock_desc, (vop_t *) vop_defaultop }, { NULL, NULL } }; static struct vnodeopv_desc mfs_vnodeop_opv_desc = { &mfs_vnodeop_p, mfs_vnodeop_entries }; VNODEOP_SET(mfs_vnodeop_opv_desc); /* * Vnode Operations. * * Open called to allow memory filesystem to initialize and * validate before actual IO. Record our process identifier * so we can tell when we are doing I/O to ourself. * * NOTE: new device sequencing. mounts check the device reference count * before calling open, so we must associate the device in open and * disassociate it in close rather then faking it when we created the vnode. * * mfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred, * struct thread *a_td) */ /* ARGSUSED */ static int mfs_open(struct vop_open_args *ap) { struct vnode *vp = ap->a_vp; if (vp->v_type != VCHR) panic("mfs_open not VCHR"); v_associate_rdev(vp, udev2dev(vp->v_udev, 0)); return (0); } static int mfs_fsync(struct vop_fsync_args *ap) { return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap)); } /* * mfs_freeblks() - hook to allow us to free physical memory. * * We implement the B_FREEBUF strategy. We can't just madvise() * here because we have to do it in the correct order vs other bio * requests, so we queue it. * * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer * throw-away on brelse()? XXX * * mfs_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length) */ static int mfs_freeblks(struct vop_freeblks_args *ap) { struct buf *bp; struct vnode *vp = ap->a_vp; bp = geteblk(ap->a_length); bp->b_flags |= B_FREEBUF | B_ASYNC; bp->b_dev = vp->v_rdev; bp->b_blkno = ap->a_addr; bp->b_offset = dbtob(ap->a_addr); bp->b_bcount = ap->a_length; BUF_KERNPROC(bp); VOP_STRATEGY(vp, bp); return(0); } /* * Pass I/O requests to the memory filesystem process. * * mfs_strategy(struct vnode *a_vp, struct buf *a_bp) */ static int mfs_strategy(struct vop_strategy_args *ap) { struct buf *bp = ap->a_bp; struct mfsnode *mfsp; struct thread *td = curthread; /* XXX */ int s; bp->b_dev = ap->a_vp->v_rdev; mfsp = bp->b_dev->si_drv1; if (mfsp == NULL) { bp->b_error = ENXIO; bp->b_flags |= B_ERROR; biodone(bp); return(0); } /* * splbio required for queueing/dequeueing, in case of forwarded * BPs from bio interrupts (?). It may not be necessary. */ s = splbio(); if (mfsp->mfs_td == NULL) { /* * mini-root. Note: B_FREEBUF not supported at the moment, * I'm not sure what kind of dataspace b_data is in. */ caddr_t base; base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT); if (bp->b_flags & B_FREEBUF) ; if (bp->b_flags & B_READ) bcopy(base, bp->b_data, bp->b_bcount); else bcopy(bp->b_data, base, bp->b_bcount); biodone(bp); } else if (mfsp->mfs_td == td) { /* * VOP to self */ splx(s); mfs_doio(bp, mfsp); s = splbio(); } else { /* * VOP from some other process, queue to MFS process and * wake it up. */ bufq_insert_tail(&mfsp->buf_queue, bp); wakeup((caddr_t)mfsp); } splx(s); return (0); } /* * Memory file system I/O. * * Trivial on the HP since buffer has already been mapping into KVA space. * * Read and Write are handled with a simple copyin and copyout. * * We also partially support VOP_FREEBLKS() via B_FREEBUF. We can't implement * completely -- for example, on fragments or inode metadata, but we can * implement it for page-aligned requests. */ void mfs_doio(struct buf *bp, struct mfsnode *mfsp) { caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT); if (bp->b_flags & B_FREEBUF) { /* * Implement B_FREEBUF, which allows the filesystem to tell * a block device when blocks are no longer needed (like when * a file is deleted). We use the hook to MADV_FREE the VM. * This makes an MFS filesystem work as well or better then * a sun-style swap-mounted filesystem. */ int bytes = bp->b_bcount; if ((vm_offset_t)base & PAGE_MASK) { int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK); bytes -= n; base += n; } if (bytes > 0) { struct madvise_args uap; bytes &= ~PAGE_MASK; if (bytes != 0) { bzero(&uap, sizeof(uap)); uap.addr = base; uap.len = bytes; uap.behav = MADV_FREE; madvise(&uap); } } bp->b_error = 0; } else if (bp->b_flags & B_READ) { /* * Read data from our 'memory' disk */ bp->b_error = copyin(base, bp->b_data, bp->b_bcount); } else { /* * Write data to our 'memory' disk */ bp->b_error = copyout(bp->b_data, base, bp->b_bcount); } if (bp->b_error) bp->b_flags |= B_ERROR; biodone(bp); } /* * This is a noop, simply returning what one has been given. * * mfs_bmap(struct vnode *a_vp, ufs_daddr_t a_bn, struct vnode **a_vpp, * ufs_daddr_t *a_bnp, int *a_runp) */ static int mfs_bmap(struct vop_bmap_args *ap) { if (ap->a_vpp != NULL) *ap->a_vpp = ap->a_vp; if (ap->a_bnp != NULL) *ap->a_bnp = ap->a_bn; if (ap->a_runp != NULL) *ap->a_runp = 0; return (0); } /* * Memory filesystem close routine * * mfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred, * struct thread *a_td) */ /* ARGSUSED */ static int mfs_close(struct vop_close_args *ap) { struct vnode *vp = ap->a_vp; struct mfsnode *mfsp = VTOMFS(vp); struct buf *bp; int error; /* * Finish any pending I/O requests. */ while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) { bufq_remove(&mfsp->buf_queue, bp); mfs_doio(bp, mfsp); wakeup((caddr_t)bp); } /* * On last close of a memory filesystem * we must invalidate any in core blocks, so that * we can, free up its vnode. */ if ((error = vinvalbuf(vp, 1, ap->a_td, 0, 0)) != 0) return (error); /* * There should be no way to have any more uses of this * vnode, so if we find any other uses, it is a panic. */ if (vp->v_usecount > 1) printf("mfs_close: ref count %d > 1\n", vp->v_usecount); if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL)) panic("mfs_close"); /* * Send a request to the filesystem server to exit. */ mfsp->mfs_active = 0; v_release_rdev(vp); if (mfsp->mfs_dev) { destroy_dev(mfsp->mfs_dev); mfsp->mfs_dev = NULL; } wakeup((caddr_t)mfsp); return (0); } /* * Memory filesystem inactive routine * * mfs_inactive(struct vnode *a_vp, struct thread *a_td) */ /* ARGSUSED */ static int mfs_inactive(struct vop_inactive_args *ap) { struct vnode *vp = ap->a_vp; struct mfsnode *mfsp = VTOMFS(vp); if (bufq_first(&mfsp->buf_queue) != NULL) panic("mfs_inactive: not inactive (next buffer %p)", bufq_first(&mfsp->buf_queue)); VOP_UNLOCK(vp, NULL, 0, ap->a_td); return (0); } /* * Reclaim a memory filesystem devvp so that it can be reused. * * mfs_reclaim(struct vnode *a_vp) */ static int mfs_reclaim(struct vop_reclaim_args *ap) { struct vnode *vp = ap->a_vp; FREE(vp->v_data, M_MFSNODE); vp->v_data = NULL; return (0); } /* * Print out the contents of an mfsnode. * * mfs_print(struct vnode *a_vp) */ static int mfs_print(struct vop_print_args *ap) { struct mfsnode *mfsp = VTOMFS(ap->a_vp); printf("tag VT_MFS, td %p, base %p, size %ld\n", mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size); return (0); } /* * Block device bad operation */ static int mfs_badop(struct vop_generic_args *ap) { int i; printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name); i = vop_defaultop(ap); printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i); return (i); } static int mfs_getpages(struct vop_getpages_args *ap) { return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap)); }