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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 1.31 2006/08/08 01:23:07 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>
50 #include <vm/vm_object.h>
51 #include <vm/vm_page.h>
52 #include <vm/vm_pager.h>
53 #include <vm/vnode_pager.h>
56 #include <sys/thread2.h>
59 #include "mfs_extern.h"
61 static int mfs_badop (struct vop_generic_args *);
62 static int mfs_bmap (struct vop_bmap_args *);
63 static int mfs_close (struct vop_close_args *);
64 static int mfs_fsync (struct vop_fsync_args *);
65 static int mfs_freeblks (struct vop_freeblks_args *);
66 static int mfs_inactive (struct vop_inactive_args *); /* XXX */
67 static int mfs_open (struct vop_open_args *);
68 static int mfs_reclaim (struct vop_reclaim_args *); /* XXX */
69 static int mfs_print (struct vop_print_args *); /* XXX */
70 static int mfs_strategy (struct vop_strategy_args *); /* XXX */
71 static int mfs_getpages (struct vop_getpages_args *); /* XXX */
73 * mfs vnode operations. Note: the vops here are used for the MFS block
74 * device, not for operations on files (MFS calls the ffs mount code for that)
76 static struct vop_ops mfs_vnode_vops = {
77 .vop_default = mfs_badop,
79 .vop_close = mfs_close,
80 .vop_freeblks = mfs_freeblks,
81 .vop_fsync = mfs_fsync,
82 .vop_getpages = mfs_getpages,
83 .vop_inactive = mfs_inactive,
84 .vop_ioctl = (void *)vop_enotty,
85 .vop_islocked = vop_stdislocked,
86 .vop_lock = vop_stdlock,
88 .vop_print = mfs_print,
89 .vop_reclaim = mfs_reclaim,
90 .vop_strategy = mfs_strategy,
91 .vop_unlock = vop_stdunlock
94 struct vop_ops *mfs_vnode_vops_p = &mfs_vnode_vops;
96 VNODEOP_SET(mfs_vnode_vops);
101 * Open called to allow memory filesystem to initialize and
102 * validate before actual IO. Record our process identifier
103 * so we can tell when we are doing I/O to ourself.
105 * NOTE: new device sequencing. mounts check the device reference count
106 * before calling open, so we must associate the device in open and
107 * disassociate it in close rather then faking it when we created the vnode.
109 * mfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
110 * struct thread *a_td)
114 mfs_open(struct vop_open_args *ap)
116 struct vnode *vp = ap->a_vp;
118 if (vp->v_type != VCHR)
119 panic("mfs_open not VCHR");
120 v_associate_rdev(vp, udev2dev(vp->v_udev, 0));
121 return (vop_stdopen(ap));
125 mfs_fsync(struct vop_fsync_args *ap)
127 return (VOCALL(&spec_vnode_vops, &ap->a_head));
131 * mfs_freeblks() - hook to allow us to free physical memory.
133 * We implement the BUF_CMD_FREEBLKS strategy. We can't just madvise()
134 * here because we have to do it in the correct order vs other bio
135 * requests, so we queue it.
137 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
138 * throw-away on brelse()? XXX
140 * mfs_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
143 mfs_freeblks(struct vop_freeblks_args *ap)
146 struct vnode *vp = ap->a_vp;
148 bp = geteblk(ap->a_length);
149 bp->b_flags |= B_ASYNC;
150 bp->b_cmd = BUF_CMD_FREEBLKS;
151 bp->b_bio1.bio_offset = ap->a_offset;
152 bp->b_bcount = ap->a_length;
154 vn_strategy(vp, &bp->b_bio1);
159 * Pass I/O requests to the memory filesystem process.
161 * mfs_strategy(struct vnode *a_vp, struct bio *a_bio)
164 mfs_strategy(struct vop_strategy_args *ap)
166 struct bio *bio = ap->a_bio;
167 struct buf *bp = bio->bio_buf;
168 struct mfsnode *mfsp;
169 struct thread *td = curthread; /* XXX */
171 mfsp = ap->a_vp->v_rdev->si_drv1;
174 bp->b_flags |= B_ERROR;
180 * splbio required for queueing/dequeueing, in case of forwarded
181 * BPs from bio interrupts (?). It may not be necessary.
186 if (mfsp->mfs_td == NULL) {
188 * mini-root. Note: BUF_CMD_FREEBLKS not supported at the
189 * moment, since we do not know what kind of dataspace
194 base = mfsp->mfs_baseoff + bio->bio_offset;
196 case BUF_CMD_FREEBLKS:
199 bcopy(base, bp->b_data, bp->b_bcount);
202 bcopy(bp->b_data, base, bp->b_bcount);
205 panic("mfs: bad b_cmd %d\n", bp->b_cmd);
208 } else if (mfsp->mfs_td == td) {
217 * VOP from some other process, queue to MFS process and
220 bioq_insert_tail(&mfsp->bio_queue, bio);
221 wakeup((caddr_t)mfsp);
228 * Memory file system I/O.
230 * Trivial on the HP since buffer has already been mapping into KVA space.
232 * Read and Write are handled with a simple copyin and copyout.
234 * We also partially support VOP_FREEBLKS(). We can't implement
235 * completely -- for example, on fragments or inode metadata, but we can
236 * implement it for page-aligned requests.
239 mfs_doio(struct bio *bio, struct mfsnode *mfsp)
241 struct buf *bp = bio->bio_buf;
242 caddr_t base = mfsp->mfs_baseoff + bio->bio_offset;
246 case BUF_CMD_FREEBLKS:
248 * Implement FREEBLKS, which allows the filesystem to tell
249 * a block device when blocks are no longer needed (like when
250 * a file is deleted). We use the hook to MADV_FREE the VM.
251 * This makes an MFS filesystem work as well or better then
252 * a sun-style swap-mounted filesystem.
254 bytes = bp->b_bcount;
256 if ((vm_offset_t)base & PAGE_MASK) {
257 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
262 struct madvise_args uap;
266 bzero(&uap, sizeof(uap));
269 uap.behav = MADV_FREE;
277 * Read data from our 'memory' disk
279 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
283 * Write data to our 'memory' disk
285 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
288 panic("mfs: bad b_cmd %d\n", bp->b_cmd);
291 bp->b_flags |= B_ERROR;
296 * This is a noop, simply returning what one has been given.
298 * mfs_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp,
299 * off_t *a_doffsetp, int *a_runp, int *a_runb)
302 mfs_bmap(struct vop_bmap_args *ap)
304 if (ap->a_vpp != NULL)
305 *ap->a_vpp = ap->a_vp;
306 if (ap->a_doffsetp != NULL)
307 *ap->a_doffsetp = ap->a_loffset;
308 if (ap->a_runp != NULL)
310 if (ap->a_runb != NULL)
316 * Memory filesystem close routine
318 * mfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred,
319 * struct thread *a_td)
323 mfs_close(struct vop_close_args *ap)
325 struct vnode *vp = ap->a_vp;
326 struct mfsnode *mfsp = VTOMFS(vp);
331 * Finish any pending I/O requests.
333 while ((bio = bioq_first(&mfsp->bio_queue)) != NULL) {
334 bioq_remove(&mfsp->bio_queue, bio);
336 wakeup((caddr_t)bio->bio_buf);
340 * We really only care about the last close
342 if (vp->v_opencount > 1)
346 * Synchronize any remaining buffers and then destroy them.
348 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0)
352 * Get rid of the pseudo-backing object. Since the object is
353 * not directly memory mapped, we don't have to worry about
357 vm_pager_deallocate(vp->v_object);
360 * There should be no way to have any more uses of this
361 * vnode, so if we find any other uses, it is a panic.
363 if (vp->v_usecount > 1)
364 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
365 if (vp->v_usecount > 1 || (bioq_first(&mfsp->bio_queue) != NULL))
368 * Send a request to the filesystem server to exit.
370 mfsp->mfs_active = 0;
373 destroy_dev(mfsp->mfs_dev);
374 mfsp->mfs_dev = NULL;
376 wakeup((caddr_t)mfsp);
383 * Memory filesystem inactive routine
385 * mfs_inactive(struct vnode *a_vp, struct thread *a_td)
389 mfs_inactive(struct vop_inactive_args *ap)
391 struct vnode *vp = ap->a_vp;
392 struct mfsnode *mfsp = VTOMFS(vp);
394 if (bioq_first(&mfsp->bio_queue) != NULL)
395 panic("mfs_inactive: not inactive (next buffer %p)",
396 bioq_first(&mfsp->bio_queue));
401 * Reclaim a memory filesystem devvp so that it can be reused.
403 * mfs_reclaim(struct vnode *a_vp)
406 mfs_reclaim(struct vop_reclaim_args *ap)
408 struct vnode *vp = ap->a_vp;
410 FREE(vp->v_data, M_MFSNODE);
416 * Print out the contents of an mfsnode.
418 * mfs_print(struct vnode *a_vp)
421 mfs_print(struct vop_print_args *ap)
423 struct mfsnode *mfsp = VTOMFS(ap->a_vp);
425 printf("tag VT_MFS, td %p, base %p, size %ld\n",
426 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
431 * Block device bad operation
434 mfs_badop(struct vop_generic_args *ap)
438 printf("mfs_badop[%s]\n", ap->a_desc->sd_name);
439 i = vop_defaultop(ap);
440 printf("mfs_badop[%s] = %d\n", ap->a_desc->sd_name, i);
445 mfs_getpages(struct vop_getpages_args *ap)
447 return (VOCALL(&spec_vnode_vops, &ap->a_head));