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33 * @(#)mfs_vnops.c 8.11 (Berkeley) 5/22/95
34 * $FreeBSD: src/sys/ufs/mfs/mfs_vnops.c,v 1.47.2.1 2001/05/22 02:06:43 bp Exp $
37 #include <sys/param.h>
38 #include <sys/systm.h>
39 #include <sys/kernel.h>
42 #include <sys/vnode.h>
43 #include <sys/malloc.h>
44 #include <sys/sysproto.h>
48 #include <ufs/mfs/mfsnode.h>
49 #include <ufs/mfs/mfs_extern.h>
51 static int mfs_badop __P((struct vop_generic_args *));
52 static int mfs_bmap __P((struct vop_bmap_args *));
53 static int mfs_close __P((struct vop_close_args *));
54 static int mfs_fsync __P((struct vop_fsync_args *));
55 static int mfs_freeblks __P((struct vop_freeblks_args *));
56 static int mfs_inactive __P((struct vop_inactive_args *)); /* XXX */
57 static int mfs_open __P((struct vop_open_args *));
58 static int mfs_reclaim __P((struct vop_reclaim_args *)); /* XXX */
59 static int mfs_print __P((struct vop_print_args *)); /* XXX */
60 static int mfs_strategy __P((struct vop_strategy_args *)); /* XXX */
61 static int mfs_getpages __P((struct vop_getpages_args *)); /* XXX */
63 * mfs vnode operations.
65 vop_t **mfs_vnodeop_p;
66 static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
67 { &vop_default_desc, (vop_t *) mfs_badop },
68 { &vop_bmap_desc, (vop_t *) mfs_bmap },
69 { &vop_bwrite_desc, (vop_t *) vop_defaultop },
70 { &vop_close_desc, (vop_t *) mfs_close },
71 { &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject },
72 { &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject },
73 { &vop_freeblks_desc, (vop_t *) mfs_freeblks },
74 { &vop_fsync_desc, (vop_t *) mfs_fsync },
75 { &vop_getpages_desc, (vop_t *) mfs_getpages },
76 { &vop_getvobject_desc, (vop_t *) vop_stdgetvobject },
77 { &vop_inactive_desc, (vop_t *) mfs_inactive },
78 { &vop_ioctl_desc, (vop_t *) vop_enotty },
79 { &vop_islocked_desc, (vop_t *) vop_defaultop },
80 { &vop_lock_desc, (vop_t *) vop_defaultop },
81 { &vop_open_desc, (vop_t *) mfs_open },
82 { &vop_print_desc, (vop_t *) mfs_print },
83 { &vop_reclaim_desc, (vop_t *) mfs_reclaim },
84 { &vop_strategy_desc, (vop_t *) mfs_strategy },
85 { &vop_unlock_desc, (vop_t *) vop_defaultop },
88 static struct vnodeopv_desc mfs_vnodeop_opv_desc =
89 { &mfs_vnodeop_p, mfs_vnodeop_entries };
91 VNODEOP_SET(mfs_vnodeop_opv_desc);
96 * Open called to allow memory filesystem to initialize and
97 * validate before actual IO. Record our process identifier
98 * so we can tell when we are doing I/O to ourself.
103 struct vop_open_args /* {
106 struct ucred *a_cred;
111 if (ap->a_vp->v_type != VBLK) {
112 panic("mfs_open not VBLK");
120 struct vop_fsync_args *ap;
123 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap));
127 * mfs_freeblks() - hook to allow us to free physical memory.
129 * We implement the B_FREEBUF strategy. We can't just madvise()
130 * here because we have to do it in the correct order vs other bio
131 * requests, so we queue it.
133 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
134 * throw-away on brelse()? XXX
139 struct vop_freeblks_args /* {
148 if (!vfinddev(ap->a_vp->v_rdev, VBLK, &vp) || vp->v_usecount == 0)
149 panic("mfs_freeblks: bad dev");
151 bp = geteblk(ap->a_length);
152 bp->b_flags |= B_FREEBUF | B_ASYNC;
153 bp->b_dev = ap->a_vp->v_rdev;
154 bp->b_blkno = ap->a_addr;
155 bp->b_offset = dbtob(ap->a_addr);
156 bp->b_bcount = ap->a_length;
158 VOP_STRATEGY(vp, bp);
163 * Pass I/O requests to the memory filesystem process.
167 struct vop_strategy_args /* {
172 register struct buf *bp = ap->a_bp;
173 register struct mfsnode *mfsp;
175 struct proc *p = curproc; /* XXX */
178 if (!vfinddev(bp->b_dev, VBLK, &vp) || vp->v_usecount == 0)
179 panic("mfs_strategy: bad dev");
183 * splbio required for queueing/dequeueing, in case of forwarded
184 * BPs from bio interrupts (?). It may not be necessary.
189 if (mfsp->mfs_pid == 0) {
191 * mini-root. Note: B_FREEBUF not supported at the moment,
192 * I'm not sure what kind of dataspace b_data is in.
196 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
197 if (bp->b_flags & B_FREEBUF)
199 if (bp->b_flags & B_READ)
200 bcopy(base, bp->b_data, bp->b_bcount);
202 bcopy(bp->b_data, base, bp->b_bcount);
204 } else if (mfsp->mfs_pid == p->p_pid) {
213 * VOP from some other process, queue to MFS process and
216 bufq_insert_tail(&mfsp->buf_queue, bp);
224 * Memory file system I/O.
226 * Trivial on the HP since buffer has already been mapping into KVA space.
228 * Read and Write are handled with a simple copyin and copyout.
230 * We also partially support VOP_FREEBLKS() via B_FREEBUF. We can't implement
231 * completely -- for example, on fragments or inode metadata, but we can
232 * implement it for page-aligned requests.
236 register struct buf *bp;
237 struct mfsnode *mfsp;
239 caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
241 if (bp->b_flags & B_FREEBUF) {
243 * Implement B_FREEBUF, which allows the filesystem to tell
244 * a block device when blocks are no longer needed (like when
245 * a file is deleted). We use the hook to MADV_FREE the VM.
246 * This makes an MFS filesystem work as well or better then
247 * a sun-style swap-mounted filesystem.
249 int bytes = bp->b_bcount;
251 if ((vm_offset_t)base & PAGE_MASK) {
252 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
257 struct madvise_args uap;
261 bzero(&uap, sizeof(uap));
264 uap.behav = MADV_FREE;
265 madvise(curproc, &uap);
269 } else if (bp->b_flags & B_READ) {
271 * Read data from our 'memory' disk
273 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
276 * Write data to our 'memory' disk
278 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
281 bp->b_flags |= B_ERROR;
286 * This is a noop, simply returning what one has been given.
290 struct vop_bmap_args /* {
293 struct vnode **a_vpp;
299 if (ap->a_vpp != NULL)
300 *ap->a_vpp = ap->a_vp;
301 if (ap->a_bnp != NULL)
302 *ap->a_bnp = ap->a_bn;
303 if (ap->a_runp != NULL)
309 * Memory filesystem close routine
314 struct vop_close_args /* {
317 struct ucred *a_cred;
321 register struct vnode *vp = ap->a_vp;
322 register struct mfsnode *mfsp = VTOMFS(vp);
323 register struct buf *bp;
327 * Finish any pending I/O requests.
329 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
330 bufq_remove(&mfsp->buf_queue, bp);
335 * On last close of a memory filesystem
336 * we must invalidate any in core blocks, so that
337 * we can, free up its vnode.
339 if ((error = vinvalbuf(vp, 1, ap->a_cred, ap->a_p, 0, 0)) != 0)
342 * There should be no way to have any more uses of this
343 * vnode, so if we find any other uses, it is a panic.
345 if (vp->v_usecount > 1)
346 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
347 if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL))
350 * Send a request to the filesystem server to exit.
352 mfsp->mfs_active = 0;
358 * Memory filesystem inactive routine
363 struct vop_inactive_args /* {
368 struct vnode *vp = ap->a_vp;
369 struct mfsnode *mfsp = VTOMFS(vp);
371 if (bufq_first(&mfsp->buf_queue) != NULL)
372 panic("mfs_inactive: not inactive (next buffer %p)",
373 bufq_first(&mfsp->buf_queue));
374 VOP_UNLOCK(vp, 0, ap->a_p);
379 * Reclaim a memory filesystem devvp so that it can be reused.
383 struct vop_reclaim_args /* {
387 register struct vnode *vp = ap->a_vp;
389 FREE(vp->v_data, M_MFSNODE);
395 * Print out the contents of an mfsnode.
399 struct vop_print_args /* {
403 register struct mfsnode *mfsp = VTOMFS(ap->a_vp);
405 printf("tag VT_MFS, pid %ld, base %p, size %ld\n",
406 (long)mfsp->mfs_pid, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
411 * Block device bad operation
414 mfs_badop(struct vop_generic_args *ap)
418 printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
419 i = vop_defaultop(ap);
420 printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i);
427 struct vop_getpages_args *ap;
430 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap));