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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 1.12 2004/04/15 00:59:41 cpressey 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.
103 * mfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
104 * struct thread *a_td)
108 mfs_open(struct vop_open_args *ap)
110 if (ap->a_vp->v_type != VCHR) {
111 panic("mfs_open not VCHR");
118 mfs_fsync(struct vop_fsync_args *ap)
120 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_fsync), ap));
124 * mfs_freeblks() - hook to allow us to free physical memory.
126 * We implement the B_FREEBUF strategy. We can't just madvise()
127 * here because we have to do it in the correct order vs other bio
128 * requests, so we queue it.
130 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
131 * throw-away on brelse()? XXX
133 * mfs_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
136 mfs_freeblks(struct vop_freeblks_args *ap)
141 if (!vfinddev(ap->a_vp->v_rdev, VCHR, &vp) || vp->v_usecount == 0)
142 panic("mfs_freeblks: bad dev");
144 bp = geteblk(ap->a_length);
145 bp->b_flags |= B_FREEBUF | B_ASYNC;
146 bp->b_dev = ap->a_vp->v_rdev;
147 bp->b_blkno = ap->a_addr;
148 bp->b_offset = dbtob(ap->a_addr);
149 bp->b_bcount = ap->a_length;
151 VOP_STRATEGY(vp, bp);
156 * Pass I/O requests to the memory filesystem process.
158 * mfs_strategy(struct vnode *a_vp, struct buf *a_bp)
161 mfs_strategy(struct vop_strategy_args *ap)
163 struct buf *bp = ap->a_bp;
164 struct mfsnode *mfsp;
166 struct thread *td = curthread; /* XXX */
169 if (!vfinddev(bp->b_dev, VCHR, &vp) || vp->v_usecount == 0)
170 panic("mfs_strategy: bad dev");
174 * splbio required for queueing/dequeueing, in case of forwarded
175 * BPs from bio interrupts (?). It may not be necessary.
180 if (mfsp->mfs_td == NULL) {
182 * mini-root. Note: B_FREEBUF not supported at the moment,
183 * I'm not sure what kind of dataspace b_data is in.
187 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
188 if (bp->b_flags & B_FREEBUF)
190 if (bp->b_flags & B_READ)
191 bcopy(base, bp->b_data, bp->b_bcount);
193 bcopy(bp->b_data, base, bp->b_bcount);
195 } else if (mfsp->mfs_td == td) {
204 * VOP from some other process, queue to MFS process and
207 bufq_insert_tail(&mfsp->buf_queue, bp);
215 * Memory file system I/O.
217 * Trivial on the HP since buffer has already been mapping into KVA space.
219 * Read and Write are handled with a simple copyin and copyout.
221 * We also partially support VOP_FREEBLKS() via B_FREEBUF. We can't implement
222 * completely -- for example, on fragments or inode metadata, but we can
223 * implement it for page-aligned requests.
226 mfs_doio(struct buf *bp, struct mfsnode *mfsp)
228 caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
230 if (bp->b_flags & B_FREEBUF) {
232 * Implement B_FREEBUF, which allows the filesystem to tell
233 * a block device when blocks are no longer needed (like when
234 * a file is deleted). We use the hook to MADV_FREE the VM.
235 * This makes an MFS filesystem work as well or better then
236 * a sun-style swap-mounted filesystem.
238 int bytes = bp->b_bcount;
240 if ((vm_offset_t)base & PAGE_MASK) {
241 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
246 struct madvise_args uap;
250 bzero(&uap, sizeof(uap));
253 uap.behav = MADV_FREE;
258 } else if (bp->b_flags & B_READ) {
260 * Read data from our 'memory' disk
262 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
265 * Write data to our 'memory' disk
267 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
270 bp->b_flags |= B_ERROR;
275 * This is a noop, simply returning what one has been given.
277 * mfs_bmap(struct vnode *a_vp, ufs_daddr_t a_bn, struct vnode **a_vpp,
278 * ufs_daddr_t *a_bnp, int *a_runp)
281 mfs_bmap(struct vop_bmap_args *ap)
283 if (ap->a_vpp != NULL)
284 *ap->a_vpp = ap->a_vp;
285 if (ap->a_bnp != NULL)
286 *ap->a_bnp = ap->a_bn;
287 if (ap->a_runp != NULL)
293 * Memory filesystem close routine
295 * mfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred,
296 * struct thread *a_td)
300 mfs_close(struct vop_close_args *ap)
302 struct vnode *vp = ap->a_vp;
303 struct mfsnode *mfsp = VTOMFS(vp);
308 * Finish any pending I/O requests.
310 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
311 bufq_remove(&mfsp->buf_queue, bp);
316 * On last close of a memory filesystem
317 * we must invalidate any in core blocks, so that
318 * we can, free up its vnode.
320 if ((error = vinvalbuf(vp, 1, ap->a_td, 0, 0)) != 0)
323 * There should be no way to have any more uses of this
324 * vnode, so if we find any other uses, it is a panic.
326 if (vp->v_usecount > 1)
327 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
328 if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL))
331 * Send a request to the filesystem server to exit.
333 mfsp->mfs_active = 0;
339 * Memory filesystem inactive routine
341 * mfs_inactive(struct vnode *a_vp, struct thread *a_td)
345 mfs_inactive(struct vop_inactive_args *ap)
347 struct vnode *vp = ap->a_vp;
348 struct mfsnode *mfsp = VTOMFS(vp);
350 if (bufq_first(&mfsp->buf_queue) != NULL)
351 panic("mfs_inactive: not inactive (next buffer %p)",
352 bufq_first(&mfsp->buf_queue));
353 VOP_UNLOCK(vp, NULL, 0, ap->a_td);
358 * Reclaim a memory filesystem devvp so that it can be reused.
360 * mfs_reclaim(struct vnode *a_vp)
363 mfs_reclaim(struct vop_reclaim_args *ap)
365 struct vnode *vp = ap->a_vp;
367 FREE(vp->v_data, M_MFSNODE);
373 * Print out the contents of an mfsnode.
375 * mfs_print(struct vnode *a_vp)
378 mfs_print(struct vop_print_args *ap)
380 struct mfsnode *mfsp = VTOMFS(ap->a_vp);
382 printf("tag VT_MFS, td %p, base %p, size %ld\n",
383 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
388 * Block device bad operation
391 mfs_badop(struct vop_generic_args *ap)
395 printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
396 i = vop_defaultop(ap);
397 printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name,i);
402 mfs_getpages(struct vop_getpages_args *ap)
404 return (VOCALL(spec_vnodeop_p, VOFFSET(vop_getpages), ap));