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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 1.19 2005/09/17 07:43:09 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>
51 #include <sys/thread2.h>
54 #include "mfs_extern.h"
56 static int mfs_badop (struct vop_generic_args *);
57 static int mfs_bmap (struct vop_bmap_args *);
58 static int mfs_close (struct vop_close_args *);
59 static int mfs_fsync (struct vop_fsync_args *);
60 static int mfs_freeblks (struct vop_freeblks_args *);
61 static int mfs_inactive (struct vop_inactive_args *); /* XXX */
62 static int mfs_open (struct vop_open_args *);
63 static int mfs_reclaim (struct vop_reclaim_args *); /* XXX */
64 static int mfs_print (struct vop_print_args *); /* XXX */
65 static int mfs_strategy (struct vop_strategy_args *); /* XXX */
66 static int mfs_getpages (struct vop_getpages_args *); /* XXX */
68 * mfs vnode operations. Note: the vops here are used for the MFS block
69 * device, not for operations on files (MFS calls the ffs mount code for that)
71 struct vop_ops *mfs_vnode_vops;
72 static struct vnodeopv_entry_desc mfs_vnodeop_entries[] = {
73 { &vop_default_desc, (vnodeopv_entry_t) mfs_badop },
74 { &vop_bmap_desc, (vnodeopv_entry_t) mfs_bmap },
75 { &vop_bwrite_desc, vop_defaultop },
76 { &vop_close_desc, (vnodeopv_entry_t) mfs_close },
77 { &vop_createvobject_desc, (vnodeopv_entry_t) vop_stdcreatevobject },
78 { &vop_destroyvobject_desc, (vnodeopv_entry_t) vop_stddestroyvobject },
79 { &vop_freeblks_desc, (vnodeopv_entry_t) mfs_freeblks },
80 { &vop_fsync_desc, (vnodeopv_entry_t) mfs_fsync },
81 { &vop_getpages_desc, (vnodeopv_entry_t) mfs_getpages },
82 { &vop_getvobject_desc, (vnodeopv_entry_t) vop_stdgetvobject },
83 { &vop_inactive_desc, (vnodeopv_entry_t) mfs_inactive },
84 { &vop_ioctl_desc, vop_enotty },
85 { &vop_islocked_desc, vop_defaultop },
86 { &vop_lock_desc, vop_defaultop },
87 { &vop_open_desc, (vnodeopv_entry_t) mfs_open },
88 { &vop_print_desc, (vnodeopv_entry_t) mfs_print },
89 { &vop_reclaim_desc, (vnodeopv_entry_t) mfs_reclaim },
90 { &vop_strategy_desc, (vnodeopv_entry_t) mfs_strategy },
91 { &vop_unlock_desc, vop_defaultop },
94 static struct vnodeopv_desc mfs_vnodeop_opv_desc =
95 { &mfs_vnode_vops, mfs_vnodeop_entries, 0 };
97 VNODEOP_SET(mfs_vnodeop_opv_desc);
102 * Open called to allow memory filesystem to initialize and
103 * validate before actual IO. Record our process identifier
104 * so we can tell when we are doing I/O to ourself.
106 * NOTE: new device sequencing. mounts check the device reference count
107 * before calling open, so we must associate the device in open and
108 * disassociate it in close rather then faking it when we created the vnode.
110 * mfs_open(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
111 * struct thread *a_td)
115 mfs_open(struct vop_open_args *ap)
117 struct vnode *vp = ap->a_vp;
119 if (vp->v_type != VCHR)
120 panic("mfs_open not VCHR");
121 v_associate_rdev(vp, udev2dev(vp->v_udev, 0));
126 mfs_fsync(struct vop_fsync_args *ap)
128 return (VOCALL(spec_vnode_vops, &ap->a_head));
132 * mfs_freeblks() - hook to allow us to free physical memory.
134 * We implement the B_FREEBUF strategy. We can't just madvise()
135 * here because we have to do it in the correct order vs other bio
136 * requests, so we queue it.
138 * Note: geteblk() sets B_INVAL. We leave it set to guarentee buffer
139 * throw-away on brelse()? XXX
141 * mfs_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length)
144 mfs_freeblks(struct vop_freeblks_args *ap)
147 struct vnode *vp = ap->a_vp;
149 bp = geteblk(ap->a_length);
150 bp->b_flags |= B_FREEBUF | B_ASYNC;
151 bp->b_dev = vp->v_rdev;
152 bp->b_blkno = ap->a_addr;
153 bp->b_offset = dbtob(ap->a_addr);
154 bp->b_bcount = ap->a_length;
156 VOP_STRATEGY(vp, bp);
161 * Pass I/O requests to the memory filesystem process.
163 * mfs_strategy(struct vnode *a_vp, struct buf *a_bp)
166 mfs_strategy(struct vop_strategy_args *ap)
168 struct buf *bp = ap->a_bp;
169 struct mfsnode *mfsp;
170 struct thread *td = curthread; /* XXX */
172 bp->b_dev = ap->a_vp->v_rdev;
173 mfsp = bp->b_dev->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: B_FREEBUF not supported at the moment,
191 * I'm not sure what kind of dataspace b_data is in.
195 base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
196 if (bp->b_flags & B_FREEBUF)
198 if (bp->b_flags & B_READ)
199 bcopy(base, bp->b_data, bp->b_bcount);
201 bcopy(bp->b_data, base, bp->b_bcount);
203 } else if (mfsp->mfs_td == td) {
212 * VOP from some other process, queue to MFS process and
215 bufq_insert_tail(&mfsp->buf_queue, bp);
216 wakeup((caddr_t)mfsp);
223 * Memory file system I/O.
225 * Trivial on the HP since buffer has already been mapping into KVA space.
227 * Read and Write are handled with a simple copyin and copyout.
229 * We also partially support VOP_FREEBLKS() via B_FREEBUF. We can't implement
230 * completely -- for example, on fragments or inode metadata, but we can
231 * implement it for page-aligned requests.
234 mfs_doio(struct buf *bp, struct mfsnode *mfsp)
236 caddr_t base = mfsp->mfs_baseoff + (bp->b_blkno << DEV_BSHIFT);
238 if (bp->b_flags & B_FREEBUF) {
240 * Implement B_FREEBUF, which allows the filesystem to tell
241 * a block device when blocks are no longer needed (like when
242 * a file is deleted). We use the hook to MADV_FREE the VM.
243 * This makes an MFS filesystem work as well or better then
244 * a sun-style swap-mounted filesystem.
246 int bytes = bp->b_bcount;
248 if ((vm_offset_t)base & PAGE_MASK) {
249 int n = PAGE_SIZE - ((vm_offset_t)base & PAGE_MASK);
254 struct madvise_args uap;
258 bzero(&uap, sizeof(uap));
261 uap.behav = MADV_FREE;
266 } else if (bp->b_flags & B_READ) {
268 * Read data from our 'memory' disk
270 bp->b_error = copyin(base, bp->b_data, bp->b_bcount);
273 * Write data to our 'memory' disk
275 bp->b_error = copyout(bp->b_data, base, bp->b_bcount);
278 bp->b_flags |= B_ERROR;
283 * This is a noop, simply returning what one has been given.
285 * mfs_bmap(struct vnode *a_vp, ufs_daddr_t a_bn, struct vnode **a_vpp,
286 * ufs_daddr_t *a_bnp, int *a_runp)
289 mfs_bmap(struct vop_bmap_args *ap)
291 if (ap->a_vpp != NULL)
292 *ap->a_vpp = ap->a_vp;
293 if (ap->a_bnp != NULL)
294 *ap->a_bnp = ap->a_bn;
295 if (ap->a_runp != NULL)
301 * Memory filesystem close routine
303 * mfs_close(struct vnode *a_vp, int a_fflag, struct ucred *a_cred,
304 * struct thread *a_td)
308 mfs_close(struct vop_close_args *ap)
310 struct vnode *vp = ap->a_vp;
311 struct mfsnode *mfsp = VTOMFS(vp);
316 * Finish any pending I/O requests.
318 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
319 bufq_remove(&mfsp->buf_queue, bp);
324 * On last close of a memory filesystem
325 * we must invalidate any in core blocks, so that
326 * we can, free up its vnode.
328 if ((error = vinvalbuf(vp, 1, ap->a_td, 0, 0)) != 0)
331 * There should be no way to have any more uses of this
332 * vnode, so if we find any other uses, it is a panic.
334 if (vp->v_usecount > 1)
335 printf("mfs_close: ref count %d > 1\n", vp->v_usecount);
336 if (vp->v_usecount > 1 || (bufq_first(&mfsp->buf_queue) != NULL))
339 * Send a request to the filesystem server to exit.
341 mfsp->mfs_active = 0;
344 destroy_dev(mfsp->mfs_dev);
345 mfsp->mfs_dev = NULL;
347 wakeup((caddr_t)mfsp);
352 * Memory filesystem inactive routine
354 * mfs_inactive(struct vnode *a_vp, struct thread *a_td)
358 mfs_inactive(struct vop_inactive_args *ap)
360 struct vnode *vp = ap->a_vp;
361 struct mfsnode *mfsp = VTOMFS(vp);
363 if (bufq_first(&mfsp->buf_queue) != NULL)
364 panic("mfs_inactive: not inactive (next buffer %p)",
365 bufq_first(&mfsp->buf_queue));
370 * Reclaim a memory filesystem devvp so that it can be reused.
372 * mfs_reclaim(struct vnode *a_vp)
375 mfs_reclaim(struct vop_reclaim_args *ap)
377 struct vnode *vp = ap->a_vp;
379 FREE(vp->v_data, M_MFSNODE);
385 * Print out the contents of an mfsnode.
387 * mfs_print(struct vnode *a_vp)
390 mfs_print(struct vop_print_args *ap)
392 struct mfsnode *mfsp = VTOMFS(ap->a_vp);
394 printf("tag VT_MFS, td %p, base %p, size %ld\n",
395 mfsp->mfs_td, (void *)mfsp->mfs_baseoff, mfsp->mfs_size);
400 * Block device bad operation
403 mfs_badop(struct vop_generic_args *ap)
407 printf("mfs_badop[%s]\n", ap->a_desc->vdesc_name);
408 i = vop_defaultop(ap);
409 printf("mfs_badop[%s] = %d\n", ap->a_desc->vdesc_name, i);
414 mfs_getpages(struct vop_getpages_args *ap)
416 return (VOCALL(spec_vnode_vops, &ap->a_head));