/* $OpenBSD: mfs_vnops.c,v 1.60 2022/06/26 05:20:43 visa Exp $ */ /* $NetBSD: mfs_vnops.c,v 1.8 1996/03/17 02:16:32 christos Exp $ */ /* * 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. 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 8.5 (Berkeley) 7/28/94 */ #include #include #include #include #include #include #include #include #include #include #include #include /* mfs vnode operations. */ const struct vops mfs_vops = { .vop_lookup = vop_generic_badop, .vop_create = vop_generic_badop, .vop_mknod = vop_generic_badop, .vop_open = mfs_open, .vop_close = mfs_close, .vop_access = vop_generic_badop, .vop_getattr = vop_generic_badop, .vop_setattr = vop_generic_badop, .vop_read = vop_generic_badop, .vop_write = vop_generic_badop, .vop_ioctl = mfs_ioctl, .vop_kqfilter = vop_generic_badop, .vop_revoke = vop_generic_revoke, .vop_fsync = spec_fsync, .vop_remove = vop_generic_badop, .vop_link = vop_generic_badop, .vop_rename = vop_generic_badop, .vop_mkdir = vop_generic_badop, .vop_rmdir = vop_generic_badop, .vop_symlink = vop_generic_badop, .vop_readdir = vop_generic_badop, .vop_readlink = vop_generic_badop, .vop_abortop = vop_generic_badop, .vop_inactive = mfs_inactive, .vop_reclaim = mfs_reclaim, .vop_lock = nullop, .vop_unlock = nullop, .vop_islocked = nullop, .vop_bmap = vop_generic_bmap, .vop_strategy = mfs_strategy, .vop_print = mfs_print, .vop_pathconf = vop_generic_badop, .vop_advlock = vop_generic_badop, .vop_bwrite = vop_generic_bwrite }; /* * 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. */ int mfs_open(void *v) { #ifdef DIAGNOSTIC struct vop_open_args *ap = v; if (ap->a_vp->v_type != VBLK) { panic("mfs_open not VBLK"); } #endif return (0); } /* * Ioctl operation. */ int mfs_ioctl(void *v) { return (ENOTTY); } /* * Pass I/O requests to the memory filesystem process. */ int mfs_strategy(void *v) { struct vop_strategy_args *ap = v; struct buf *bp = ap->a_bp; struct mfsnode *mfsp; struct vnode *vp = ap->a_vp; if (vp->v_type != VBLK || vp->v_usecount == 0) panic("mfs_strategy: bad dev"); mfsp = VTOMFS(vp); if (mfsp->mfs_tid == curproc->p_tid) { mfs_doio(mfsp, bp); } else { bufq_queue(&mfsp->mfs_bufq, bp); wakeup(vp); } return (0); } /* * Memory file system I/O. */ void mfs_doio(struct mfsnode *mfsp, struct buf *bp) { caddr_t base; long offset = bp->b_blkno << DEV_BSHIFT; int s; if (bp->b_bcount > mfsp->mfs_size - offset) bp->b_bcount = mfsp->mfs_size - offset; base = mfsp->mfs_baseoff + offset; if (bp->b_flags & B_READ) bp->b_error = copyin(base, bp->b_data, bp->b_bcount); else bp->b_error = copyout(bp->b_data, base, bp->b_bcount); if (bp->b_error) bp->b_flags |= B_ERROR; else bp->b_resid = 0; s = splbio(); biodone(bp); splx(s); } /* * Memory filesystem close routine */ int mfs_close(void *v) { struct vop_close_args *ap = v; struct vnode *vp = ap->a_vp; struct mfsnode *mfsp = VTOMFS(vp); struct buf *bp; int error; /* * Finish any pending I/O requests. */ while (1) { bp = bufq_dequeue(&mfsp->mfs_bufq); if (bp == NULL) break; mfs_doio(mfsp, bp); wakeup(bp); } /* * On last close of a memory filesystem we must invalidate any in * core blocks, so that we can free up its vnode. */ error = vinvalbuf(vp, V_SAVE, ap->a_cred, ap->a_p, 0, INFSLP); if (error != 0) return (error); #ifdef DIAGNOSTIC /* * There should be no way to have any more buffers on this vnode. */ if (bufq_peek(&mfsp->mfs_bufq)) printf("mfs_close: dirty buffers\n"); #endif /* * Send a request to the filesystem server to exit. */ mfsp->mfs_shutdown = 1; wakeup(vp); return (0); } /* * Memory filesystem inactive routine */ int mfs_inactive(void *v) { struct vop_inactive_args *ap = v; #ifdef DIAGNOSTIC struct mfsnode *mfsp = VTOMFS(ap->a_vp); if (mfsp->mfs_shutdown && bufq_peek(&mfsp->mfs_bufq)) panic("mfs_inactive: not inactive"); #endif VOP_UNLOCK(ap->a_vp); return (0); } /* * Reclaim a memory filesystem devvp so that it can be reused. */ int mfs_reclaim(void *v) { struct vop_reclaim_args *ap = v; struct vnode *vp = ap->a_vp; free(vp->v_data, M_MFSNODE, sizeof(struct mfsnode)); vp->v_data = NULL; return (0); } /* * Print out the contents of an mfsnode. */ int mfs_print(void *v) { struct vop_print_args *ap = v; struct mfsnode *mfsp = VTOMFS(ap->a_vp); printf("tag VT_MFS, tid %d, base %p, size %ld\n", mfsp->mfs_tid, mfsp->mfs_baseoff, mfsp->mfs_size); return (0); }