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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 1.27 2006/05/06 02:43:14 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 struct vop_ops *mfs_vnode_vops;
77 static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
78 { &vop_default_desc, (vnodeopv_entry_t) mfs_badop },
79 { &vop_bmap_desc, (vnodeopv_entry_t) mfs_bmap },
80 { &vop_close_desc, (vnodeopv_entry_t) mfs_close },
81 { &vop_freeblks_desc, (vnodeopv_entry_t) mfs_freeblks },
82 { &vop_fsync_desc, (vnodeopv_entry_t) mfs_fsync },
83 { &vop_getpages_desc, (vnodeopv_entry_t) mfs_getpages },
84 { &vop_inactive_desc, (vnodeopv_entry_t) mfs_inactive },
85 { &vop_ioctl_desc, vop_enotty },
86 { &vop_islocked_desc, vop_defaultop },
87 { &vop_lock_desc, vop_defaultop },
88 { &vop_open_desc, (vnodeopv_entry_t) mfs_open },
89 { &vop_print_desc, (vnodeopv_entry_t) mfs_print },
90 { &vop_reclaim_desc, (vnodeopv_entry_t) mfs_reclaim },
91 { &vop_strategy_desc, (vnodeopv_entry_t) mfs_strategy },
92 { &vop_unlock_desc, vop_defaultop },
95 static struct vnodeopv_desc mfs_vnodeop_opv_desc =
96 { &mfs_vnode_vops, mfs_vnodeop_entries, 0 };
98 VNODEOP_SET(mfs_vnodeop_opv_desc);
103 * Open called to allow memory filesystem to initialize and
104 * validate before actual IO. Record our process identifier
105 * so we can tell when we are doing I/O to ourself.
107 * NOTE: new device sequencing. mounts check the device reference count
108 * before calling open, so we must associate the device in open and
109 * disassociate it in close rather then faking it when we created the vnode.
111 * mfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
112 * struct thread *a_td)
116 mfs_open(struct vop_open_args *ap)
118 struct vnode *vp = ap->a_vp;
120 if (vp->v_type != VCHR)
121 panic("mfs_open not VCHR");
122 v_associate_rdev(vp, udev2dev(vp->v_udev, 0));
123 return (vop_stdopen(ap));
127 mfs_fsync(struct vop_fsync_args *ap)
129 return (VOCALL(spec_vnode_vops, &ap->a_head));
133 * mfs_freeblks() - hook to allow us to free physical memory.
135 * We implement the BUF_CMD_FREEBLKS strategy. We can't just madvise()
136 * here because we have to do it in the correct order vs other bio
137 * requests, so we queue it.
139 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
140 * throw-away on brelse()? XXX
142 * mfs_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
145 mfs_freeblks(struct vop_freeblks_args *ap)
148 struct vnode *vp = ap->a_vp;
150 bp = geteblk(ap->a_length);
151 bp->b_flags |= B_ASYNC;
152 bp->b_cmd = BUF_CMD_FREEBLKS;
153 bp->b_bio1.bio_offset = ap->a_offset;
154 bp->b_bcount = ap->a_length;
156 vn_strategy(vp, &bp->b_bio1);
161 * Pass I/O requests to the memory filesystem process.
163 * mfs_strategy(struct vnode *a_vp, struct bio *a_bio)
166 mfs_strategy(struct vop_strategy_args *ap)
168 struct bio *bio = ap->a_bio;
169 struct buf *bp = bio->bio_buf;
170 struct mfsnode *mfsp;
171 struct thread *td = curthread; /* XXX */
173 mfsp = ap->a_vp->v_rdev->si_drv1;
176 bp->b_flags |= B_ERROR;
182 * splbio required for queueing/dequeueing, in case of forwarded
183 * BPs from bio interrupts (?). It may not be necessary.
188 if (mfsp->mfs_td == NULL) {
190 * mini-root. Note: BUF_CMD_FREEBLKS not supported at the
191 * moment, since we do not know what kind of dataspace
196 base = mfsp->mfs_baseoff + bio->bio_offset;
198 case BUF_CMD_FREEBLKS:
201 bcopy(base, bp->b_data, bp->b_bcount);
204 bcopy(bp->b_data, base, bp->b_bcount);
207 panic("mfs: bad b_cmd %d\n", bp->b_cmd);
210 } else if (mfsp->mfs_td == td) {
219 * VOP from some other process, queue to MFS process and
222 bioq_insert_tail(&mfsp->bio_queue, bio);
223 wakeup((caddr_t)mfsp);
230 * Memory file system I/O.
232 * Trivial on the HP since buffer has already been mapping into KVA space.
234 * Read and Write are handled with a simple copyin and copyout.
236 * We also partially support VOP_FREEBLKS(). We can't implement
237 * completely -- for example, on fragments or inode metadata, but we can
238 * implement it for page-aligned requests.
241 mfs_doio(struct bio *bio, struct mfsnode *mfsp)
243 struct buf *bp = bio->bio_buf;
244 caddr_t base = mfsp->mfs_baseoff + bio->bio_offset;
248 case BUF_CMD_FREEBLKS:
250 * Implement FREEBLKS, which allows the filesystem to tell
251 * a block device when blocks are no longer needed (like when
252 * a file is deleted). We use the hook to MADV_FREE the VM.
253 * This makes an MFS filesystem work as well or better then
254 * a sun-style swap-mounted filesystem.
256 bytes = bp->b_bcount;
258 if ((vm_offset_t)base & PAGE_MASK) {
259 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
264 struct madvise_args uap;
268 bzero(&uap, sizeof(uap));
271 uap.behav = MADV_FREE;
279 * Read data from our 'memory' disk
281 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
285 * Write data to our 'memory' disk
287 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
290 panic("mfs: bad b_cmd %d\n", bp->b_cmd);
293 bp->b_flags |= B_ERROR;
298 * This is a noop, simply returning what one has been given.
300 * mfs_bmap(struct vnode *a_vp, off_t a_loffset, struct vnode **a_vpp,
301 * off_t *a_doffsetp, int *a_runp, int *a_runb)
304 mfs_bmap(struct vop_bmap_args *ap)
306 if (ap->a_vpp != NULL)
307 *ap->a_vpp = ap->a_vp;
308 if (ap->a_doffsetp != NULL)
309 *ap->a_doffsetp = ap->a_loffset;
310 if (ap->a_runp != NULL)
312 if (ap->a_runb != NULL)
318 * Memory filesystem close routine
320 * mfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred,
321 * struct thread *a_td)
325 mfs_close(struct vop_close_args *ap)
327 struct vnode *vp = ap->a_vp;
328 struct mfsnode *mfsp = VTOMFS(vp);
333 * Finish any pending I/O requests.
335 while ((bio = bioq_first(&mfsp->bio_queue)) != NULL) {
336 bioq_remove(&mfsp->bio_queue, bio);
338 wakeup((caddr_t)bio->bio_buf);
342 * We really only care about the last close
344 if (vp->v_opencount > 1)
348 * Synchronize any remaining buffers and then destroy them.
350 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0)
354 * Get rid of the pseudo-backing object. Since the object is
355 * not directly memory mapped, we don't have to worry about
359 vm_pager_deallocate(vp->v_object);
362 * There should be no way to have any more uses of this
363 * vnode, so if we find any other uses, it is a panic.
365 if (vp->v_usecount > 1)
366 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
367 if (vp->v_usecount > 1 || (bioq_first(&mfsp->bio_queue) != NULL))
370 * Send a request to the filesystem server to exit.
372 mfsp->mfs_active = 0;
375 destroy_dev(mfsp->mfs_dev);
376 mfsp->mfs_dev = NULL;
378 wakeup((caddr_t)mfsp);
385 * Memory filesystem inactive routine
387 * mfs_inactive(struct vnode *a_vp, struct thread *a_td)
391 mfs_inactive(struct vop_inactive_args *ap)
393 struct vnode *vp = ap->a_vp;
394 struct mfsnode *mfsp = VTOMFS(vp);
396 if (bioq_first(&mfsp->bio_queue) != NULL)
397 panic("mfs_inactive: not inactive (next buffer %p)",
398 bioq_first(&mfsp->bio_queue));
403 * Reclaim a memory filesystem devvp so that it can be reused.
405 * mfs_reclaim(struct vnode *a_vp)
408 mfs_reclaim(struct vop_reclaim_args *ap)
410 struct vnode *vp = ap->a_vp;
412 FREE(vp->v_data, M_MFSNODE);
418 * Print out the contents of an mfsnode.
420 * mfs_print(struct vnode *a_vp)
423 mfs_print(struct vop_print_args *ap)
425 struct mfsnode *mfsp = VTOMFS(ap->a_vp);
427 printf("tag VT_MFS, td %p, base %p, size %ld\n",
428 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
433 * Block device bad operation
436 mfs_badop(struct vop_generic_args *ap)
440 printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
441 i = vop_defaultop(ap);
442 printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name, i);
447 mfs_getpages(struct vop_getpages_args *ap)
449 return (VOCALL(spec_vnode_vops, &ap->a_head));