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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 $
35 * $DragonFly: src/sys/vfs/mfs/mfs_vnops.c,v 1.11 2004/03/01 06:33:21 dillon Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
40 #include <sys/kernel.h>
43 #include <sys/vnode.h>
44 #include <sys/malloc.h>
45 #include <sys/sysproto.h>
52 #include "mfs_extern.h"
54 static int mfs_badop (struct vop_generic_args *);
55 static int mfs_bmap (struct vop_bmap_args *);
56 static int mfs_close (struct vop_close_args *);
57 static int mfs_fsync (struct vop_fsync_args *);
58 static int mfs_freeblks (struct vop_freeblks_args *);
59 static int mfs_inactive (struct vop_inactive_args *); /* XXX */
60 static int mfs_open (struct vop_open_args *);
61 static int mfs_reclaim (struct vop_reclaim_args *); /* XXX */
62 static int mfs_print (struct vop_print_args *); /* XXX */
63 static int mfs_strategy (struct vop_strategy_args *); /* XXX */
64 static int mfs_getpages (struct vop_getpages_args *); /* XXX */
66 * mfs vnode operations.
68 vop_t **mfs_vnodeop_p;
69 static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
70 { &vop_default_desc, (vop_t *) mfs_badop },
71 { &vop_bmap_desc, (vop_t *) mfs_bmap },
72 { &vop_bwrite_desc, (vop_t *) vop_defaultop },
73 { &vop_close_desc, (vop_t *) mfs_close },
74 { &vop_createvobject_desc, (vop_t *) vop_stdcreatevobject },
75 { &vop_destroyvobject_desc, (vop_t *) vop_stddestroyvobject },
76 { &vop_freeblks_desc, (vop_t *) mfs_freeblks },
77 { &vop_fsync_desc, (vop_t *) mfs_fsync },
78 { &vop_getpages_desc, (vop_t *) mfs_getpages },
79 { &vop_getvobject_desc, (vop_t *) vop_stdgetvobject },
80 { &vop_inactive_desc, (vop_t *) mfs_inactive },
81 { &vop_ioctl_desc, (vop_t *) vop_enotty },
82 { &vop_islocked_desc, (vop_t *) vop_defaultop },
83 { &vop_lock_desc, (vop_t *) vop_defaultop },
84 { &vop_open_desc, (vop_t *) mfs_open },
85 { &vop_print_desc, (vop_t *) mfs_print },
86 { &vop_reclaim_desc, (vop_t *) mfs_reclaim },
87 { &vop_strategy_desc, (vop_t *) mfs_strategy },
88 { &vop_unlock_desc, (vop_t *) vop_defaultop },
91 static struct vnodeopv_desc mfs_vnodeop_opv_desc =
92 { &mfs_vnodeop_p, mfs_vnodeop_entries };
94 VNODEOP_SET(mfs_vnodeop_opv_desc);
99 * Open called to allow memory filesystem to initialize and
100 * validate before actual IO. Record our process identifier
101 * so we can tell when we are doing I/O to ourself.
106 struct vop_open_args /* {
109 struct ucred *a_cred;
114 if (ap->a_vp->v_type != VCHR) {
115 panic("mfs_open not VCHR");
123 struct vop_fsync_args *ap;
126 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap));
130 * mfs_freeblks() - hook to allow us to free physical memory.
132 * We implement the B_FREEBUF strategy. We can't just madvise()
133 * here because we have to do it in the correct order vs other bio
134 * requests, so we queue it.
136 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
137 * throw-away on brelse()? XXX
142 struct vop_freeblks_args /* {
151 if (!vfinddev(ap->a_vp->v_rdev, VCHR, &vp) || vp->v_usecount == 0)
152 panic("mfs_freeblks: bad dev");
154 bp = geteblk(ap->a_length);
155 bp->b_flags |= B_FREEBUF | B_ASYNC;
156 bp->b_dev = ap->a_vp->v_rdev;
157 bp->b_blkno = ap->a_addr;
158 bp->b_offset = dbtob(ap->a_addr);
159 bp->b_bcount = ap->a_length;
161 VOP_STRATEGY(vp, bp);
166 * Pass I/O requests to the memory filesystem process.
170 struct vop_strategy_args /* {
175 struct buf *bp = ap->a_bp;
176 struct mfsnode *mfsp;
178 struct thread *td = curthread; /* XXX */
181 if (!vfinddev(bp->b_dev, VCHR, &vp) || vp->v_usecount == 0)
182 panic("mfs_strategy: bad dev");
186 * splbio required for queueing/dequeueing, in case of forwarded
187 * BPs from bio interrupts (?). It may not be necessary.
192 if (mfsp->mfs_td == NULL) {
194 * mini-root. Note: B_FREEBUF not supported at the moment,
195 * I'm not sure what kind of dataspace b_data is in.
199 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
200 if (bp->b_flags & B_FREEBUF)
202 if (bp->b_flags & B_READ)
203 bcopy(base, bp->b_data, bp->b_bcount);
205 bcopy(bp->b_data, base, bp->b_bcount);
207 } else if (mfsp->mfs_td == td) {
216 * VOP from some other process, queue to MFS process and
219 bufq_insert_tail(&mfsp->buf_queue, bp);
227 * Memory file system I/O.
229 * Trivial on the HP since buffer has already been mapping into KVA space.
231 * Read and Write are handled with a simple copyin and copyout.
233 * We also partially support VOP_FREEBLKS() via B_FREEBUF. We can't implement
234 * completely -- for example, on fragments or inode metadata, but we can
235 * implement it for page-aligned requests.
240 struct mfsnode *mfsp;
242 caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
244 if (bp->b_flags & B_FREEBUF) {
246 * Implement B_FREEBUF, which allows the filesystem to tell
247 * a block device when blocks are no longer needed (like when
248 * a file is deleted). We use the hook to MADV_FREE the VM.
249 * This makes an MFS filesystem work as well or better then
250 * a sun-style swap-mounted filesystem.
252 int bytes = bp->b_bcount;
254 if ((vm_offset_t)base & PAGE_MASK) {
255 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
260 struct madvise_args uap;
264 bzero(&uap, sizeof(uap));
267 uap.behav = MADV_FREE;
272 } else if (bp->b_flags & B_READ) {
274 * Read data from our 'memory' disk
276 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
279 * Write data to our 'memory' disk
281 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
284 bp->b_flags |= B_ERROR;
289 * This is a noop, simply returning what one has been given.
293 struct vop_bmap_args /* {
296 struct vnode **a_vpp;
302 if (ap->a_vpp != NULL)
303 *ap->a_vpp = ap->a_vp;
304 if (ap->a_bnp != NULL)
305 *ap->a_bnp = ap->a_bn;
306 if (ap->a_runp != NULL)
312 * Memory filesystem close routine
317 struct vop_close_args /* {
320 struct ucred *a_cred;
324 struct vnode *vp = ap->a_vp;
325 struct mfsnode *mfsp = VTOMFS(vp);
330 * Finish any pending I/O requests.
332 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
333 bufq_remove(&mfsp->buf_queue, bp);
338 * On last close of a memory filesystem
339 * we must invalidate any in core blocks, so that
340 * we can, free up its vnode.
342 if ((error = vinvalbuf(vp, 1, ap->a_td, 0, 0)) != 0)
345 * There should be no way to have any more uses of this
346 * vnode, so if we find any other uses, it is a panic.
348 if (vp->v_usecount > 1)
349 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
350 if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL))
353 * Send a request to the filesystem server to exit.
355 mfsp->mfs_active = 0;
361 * Memory filesystem inactive routine
366 struct vop_inactive_args /* {
371 struct vnode *vp = ap->a_vp;
372 struct mfsnode *mfsp = VTOMFS(vp);
374 if (bufq_first(&mfsp->buf_queue) != NULL)
375 panic("mfs_inactive: not inactive (next buffer %p)",
376 bufq_first(&mfsp->buf_queue));
377 VOP_UNLOCK(vp, NULL, 0, ap->a_td);
382 * Reclaim a memory filesystem devvp so that it can be reused.
386 struct vop_reclaim_args /* {
390 struct vnode *vp = ap->a_vp;
392 FREE(vp->v_data, M_MFSNODE);
398 * Print out the contents of an mfsnode.
402 struct vop_print_args /* {
406 struct mfsnode *mfsp = VTOMFS(ap->a_vp);
408 printf("tag VT_MFS, td %p, base %p, size %ld\n",
409 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
414 * Block device bad operation
417 mfs_badop(struct vop_generic_args *ap)
421 printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
422 i = vop_defaultop(ap);
423 printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i);
430 struct vop_getpages_args *ap;
433 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap));