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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 1.37 2007/08/13 17:31:56 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,
86 .vop_print = mfs_print,
87 .vop_reclaim = mfs_reclaim,
88 .vop_strategy = mfs_strategy,
91 struct vop_ops *mfs_vnode_vops_p = &mfs_vnode_vops;
93 VNODEOP_SET(mfs_vnode_vops);
98 * Open called to allow memory filesystem to initialize and
99 * validate before actual IO. Record our process identifier
100 * so we can tell when we are doing I/O to ourself.
102 * NOTE: new device sequencing. mounts check the device reference count
103 * before calling open, so we must associate the device in open and
104 * disassociate it in close rather then faking it when we created the vnode.
106 * mfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
111 mfs_open(struct vop_open_args *ap)
113 struct vnode *vp = ap->a_vp;
115 if (vp->v_type != VCHR)
116 panic("mfs_open not VCHR");
117 v_associate_rdev(vp, get_dev(vp->v_umajor, vp->v_uminor));
118 return (vop_stdopen(ap));
122 mfs_fsync(struct vop_fsync_args *ap)
124 return (VOCALL(&spec_vnode_vops, &ap->a_head));
128 * mfs_freeblks() - hook to allow us to free physical memory.
130 * We implement the BUF_CMD_FREEBLKS strategy. We can't just madvise()
131 * here because we have to do it in the correct order vs other bio
132 * requests, so we queue it.
134 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
135 * throw-away on brelse()? XXX
137 * mfs_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
140 mfs_freeblks(struct vop_freeblks_args *ap)
143 struct vnode *vp = ap->a_vp;
145 bp = geteblk(ap->a_length);
146 bp->b_cmd = BUF_CMD_FREEBLKS;
147 bp->b_bio1.bio_offset = ap->a_offset;
148 bp->b_bcount = ap->a_length;
150 vn_strategy(vp, &bp->b_bio1);
155 * Pass I/O requests to the memory filesystem process.
157 * mfs_strategy(struct vnode *a_vp, struct bio *a_bio)
160 mfs_strategy(struct vop_strategy_args *ap)
162 struct bio *bio = ap->a_bio;
163 struct buf *bp = bio->bio_buf;
164 struct mfsnode *mfsp;
165 struct thread *td = curthread; /* XXX */
167 mfsp = ap->a_vp->v_rdev->si_drv1;
170 bp->b_flags |= B_ERROR;
176 * splbio required for queueing/dequeueing, in case of forwarded
177 * BPs from bio interrupts (?). It may not be necessary.
182 if (mfsp->mfs_td == NULL) {
184 * mini-root. Note: BUF_CMD_FREEBLKS not supported at the
185 * moment, since we do not know what kind of dataspace
190 base = mfsp->mfs_baseoff + bio->bio_offset;
192 case BUF_CMD_FREEBLKS:
195 bcopy(base, bp->b_data, bp->b_bcount);
198 bcopy(bp->b_data, base, bp->b_bcount);
201 panic("mfs: bad b_cmd %d\n", bp->b_cmd);
204 } else if (mfsp->mfs_td == td) {
213 * VOP from some other process, queue to MFS process and
216 bioq_insert_tail(&mfsp->bio_queue, bio);
217 wakeup((caddr_t)mfsp);
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(). We can't implement
231 * completely -- for example, on fragments or inode metadata, but we can
232 * implement it for page-aligned requests.
235 mfs_doio(struct bio *bio, struct mfsnode *mfsp)
237 struct buf *bp = bio->bio_buf;
238 caddr_t base = mfsp->mfs_baseoff + bio->bio_offset;
242 case BUF_CMD_FREEBLKS:
244 * Implement FREEBLKS, which allows the filesystem to tell
245 * a block device when blocks are no longer needed (like when
246 * a file is deleted). We use the hook to MADV_FREE the VM.
247 * This makes an MFS filesystem work as well or better then
248 * a sun-style swap-mounted filesystem.
250 bytes = bp->b_bcount;
252 if ((vm_offset_t)base & PAGE_MASK) {
253 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
258 struct madvise_args uap;
262 bzero(&uap, sizeof(uap));
265 uap.behav = MADV_FREE;
273 * Read data from our 'memory' disk
275 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 panic("mfs: bad b_cmd %d\n", bp->b_cmd);
287 bp->b_flags |= B_ERROR;
292 * This is a noop, simply returning what one has been given.
294 * mfs_bmap(struct vnode *a_vp, off_t a_loffset,
295 * off_t *a_doffsetp, int *a_runp, int *a_runb)
298 mfs_bmap(struct vop_bmap_args *ap)
300 if (ap->a_doffsetp != NULL)
301 *ap->a_doffsetp = ap->a_loffset;
302 if (ap->a_runp != NULL)
304 if (ap->a_runb != NULL)
310 * Memory filesystem close routine
312 * mfs_close(struct vnode *a_vp, int a_fflag)
316 mfs_close(struct vop_close_args *ap)
318 struct vnode *vp = ap->a_vp;
319 struct mfsnode *mfsp = VTOMFS(vp);
324 * Finish any pending I/O requests.
326 while ((bio = bioq_first(&mfsp->bio_queue)) != NULL) {
327 bioq_remove(&mfsp->bio_queue, bio);
329 wakeup((caddr_t)bio->bio_buf);
333 * We really only care about the last close
335 if (vp->v_opencount > 1)
339 * Synchronize any remaining buffers and then destroy them.
341 if ((error = vinvalbuf(vp, V_SAVE, 0, 0)) != 0)
345 * Get rid of the pseudo-backing object. Since the object is
346 * not directly memory mapped, we don't have to worry about
350 vm_pager_deallocate(vp->v_object);
353 * There should be no way to have any more uses of this
354 * vnode, so if we find any other uses, it is a panic.
356 if (vp->v_sysref.refcnt > 1)
357 kprintf("mfs_close: ref count %d > 1\n", vp->v_sysref.refcnt);
358 if (vp->v_sysref.refcnt > 1 || (bioq_first(&mfsp->bio_queue) != NULL))
361 * Send a request to the filesystem server to exit.
363 mfsp->mfs_active = 0;
366 destroy_dev(mfsp->mfs_dev);
367 mfsp->mfs_dev = NULL;
369 wakeup((caddr_t)mfsp);
376 * Memory filesystem inactive routine
378 * mfs_inactive(struct vnode *a_vp)
382 mfs_inactive(struct vop_inactive_args *ap)
384 struct vnode *vp = ap->a_vp;
385 struct mfsnode *mfsp = VTOMFS(vp);
387 if (bioq_first(&mfsp->bio_queue) != NULL)
388 panic("mfs_inactive: not inactive (next buffer %p)",
389 bioq_first(&mfsp->bio_queue));
394 * Reclaim a memory filesystem devvp so that it can be reused.
396 * mfs_reclaim(struct vnode *a_vp)
399 mfs_reclaim(struct vop_reclaim_args *ap)
401 struct vnode *vp = ap->a_vp;
403 FREE(vp->v_data, M_MFSNODE);
409 * Print out the contents of an mfsnode.
411 * mfs_print(struct vnode *a_vp)
414 mfs_print(struct vop_print_args *ap)
416 struct mfsnode *mfsp = VTOMFS(ap->a_vp);
418 kprintf("tag VT_MFS, td %p, base %p, size %ld\n",
419 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
424 * Block device bad operation
427 mfs_badop(struct vop_generic_args *ap)
431 kprintf("mfs_badop[%s]\n", ap->a_desc->sd_name);
432 i = vop_defaultop(ap);
433 kprintf("mfs_badop[%s] = %d\n", ap->a_desc->sd_name, i);
438 mfs_getpages(struct vop_getpages_args *ap)
440 return (VOCALL(&spec_vnode_vops, &ap->a_head));