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33 * @(#)mfs_vfsops.c 8.11 (Berkeley) 6/19/95
34 * $FreeBSD: src/sys/ufs/mfs/mfs_vfsops.c,v 1.81.2.3 2001/07/04 17:35:21 tegge Exp $
35 * $DragonFly: src/sys/vfs/mfs/mfs_vfsops.c,v 1.7 2003/07/21 05:50:47 dillon Exp $
41 #include <sys/param.h>
42 #include <sys/systm.h>
44 #include <sys/kernel.h>
47 #include <sys/mount.h>
48 #include <sys/signalvar.h>
49 #include <sys/vnode.h>
50 #include <sys/malloc.h>
51 #include <sys/linker.h>
55 #include <ufs/ufs/quota.h>
56 #include <ufs/ufs/inode.h>
57 #include <ufs/ufs/ufsmount.h>
58 #include <ufs/ufs/ufs_extern.h>
60 #include <ufs/ffs/fs.h>
61 #include <ufs/ffs/ffs_extern.h>
63 #include <ufs/mfs/mfsnode.h>
64 #include <ufs/mfs/mfs_extern.h>
66 MALLOC_DEFINE(M_MFSNODE, "MFS node", "MFS vnode private part");
69 static int mfs_minor; /* used for building internal dev_t */
71 extern vop_t **mfs_vnodeop_p;
73 static int mfs_mount __P((struct mount *mp,
74 char *path, caddr_t data, struct nameidata *ndp,
76 static int mfs_start __P((struct mount *mp, int flags, struct thread *td));
77 static int mfs_statfs __P((struct mount *mp, struct statfs *sbp,
79 static int mfs_init __P((struct vfsconf *));
81 #define MFS_CDEV_MAJOR 253
83 static struct cdevsw mfs_cdevsw = {
85 /* maj */ MFS_CDEV_MAJOR,
93 /* write */ physwrite,
97 /* strategy */ nostrategy,
103 * mfs vfs operations.
105 static struct vfsops mfs_vfsops = {
122 VFS_SET(mfs_vfsops, mfs, 0);
128 * Called when mounting local physical media
132 * mp mount point structure
133 * path NULL (flag for root mount!!!)
136 * p process (user credentials check [statfs])
139 * mp mount point structure
140 * path path to mount point
141 * data pointer to argument struct in user space
142 * ndp mount point namei() return (used for
143 * credentials on reload), reused to look
145 * p process (user credentials check)
148 * !0 error number (errno.h)
153 * mount point is locked
155 * mount point is locked
158 * A NULL path can be used for a flag since the mount
159 * system call will fail with EFAULT in copyinstr in
160 * namei() if it is a genuine NULL from the user.
164 mfs_mount(mp, path, data, ndp, td)
165 register struct mount *mp;
168 struct nameidata *ndp;
172 struct mfs_args args;
173 struct ufsmount *ump;
175 struct mfsnode *mfsp;
181 * Use NULL path to flag a root mount
186 * Mounting root file system
191 panic("mfs_mount: mount MFS as root: not configured!");
196 * Mounting non-root file system or updating a file system
200 /* copy in user arguments*/
201 if ((err = copyin(data, (caddr_t)&args, sizeof (struct mfs_args))) != 0)
205 * If updating, check whether changing from read-only to
206 * read/write; if there is no device name, that's all we do.
208 if (mp->mnt_flag & MNT_UPDATE) {
216 if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
218 if (mp->mnt_flag & MNT_FORCE)
220 err = ffs_flushfiles(mp, flags, td);
224 if (fs->fs_ronly && (mp->mnt_kern_flag & MNTK_WANTRDWR))
226 /* if not updating name...*/
227 if (args.fspec == 0) {
229 * Process export requests. Jumping to "success"
230 * will return the vfs_export() error code.
232 err = vfs_export(mp, &ump->um_export, &args.export);
236 /* XXX MFS does not support name updating*/
240 * Do the MALLOC before the getnewvnode since doing so afterward
241 * might cause a bogus v_data pointer to get dereferenced
242 * elsewhere if MALLOC should block.
244 MALLOC(mfsp, struct mfsnode *, sizeof *mfsp, M_MFSNODE, M_WAITOK);
246 err = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
248 FREE(mfsp, M_MFSNODE);
251 devvp->v_type = VBLK;
252 dev = make_dev(&mfs_cdevsw, mfs_minor, 0, 0, 0, "MFS%d", mfs_minor);
253 /* It is not clear that these will get initialized otherwise */
254 dev->si_bsize_phys = DEV_BSIZE;
255 dev->si_iosize_max = DFLTPHYS;
256 addaliasu(devvp, makeudev(253, mfs_minor++));
257 devvp->v_data = mfsp;
258 mfsp->mfs_baseoff = args.base;
259 mfsp->mfs_size = args.size;
260 mfsp->mfs_vnode = devvp;
262 mfsp->mfs_active = 1;
263 bufq_init(&mfsp->buf_queue);
266 * Since this is a new mount, we want the names for
267 * the device and the mount point copied in. If an
268 * error occurs, the mountpoint is discarded by the
271 /* Save "last mounted on" info for mount point (NULL pad)*/
272 copyinstr( path, /* mount point*/
273 mp->mnt_stat.f_mntonname, /* save area*/
274 MNAMELEN - 1, /* max size*/
275 &size); /* real size*/
276 bzero( mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
278 /* Save "mounted from" info for mount point (NULL pad)*/
279 copyinstr( args.fspec, /* device name*/
280 mp->mnt_stat.f_mntfromname, /* save area*/
281 MNAMELEN - 1, /* max size*/
282 &size); /* real size*/
283 bzero( mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
285 if ((err = ffs_mountfs(devvp, mp, td, M_MFSNODE)) != 0) {
286 mfsp->mfs_active = 0;
291 * Initialize FS stat information in mount struct; uses both
292 * mp->mnt_stat.f_mntonname and mp->mnt_stat.f_mntfromname
294 * This code is common to root and non-root mounts
296 (void) VFS_STATFS(mp, &mp->mnt_stat, td);
300 error_2: /* error with devvp held*/
302 /* release devvp before failing*/
305 error_1: /* no state to back out*/
312 * Used to grab the process and keep it in the kernel to service
313 * memory filesystem I/O requests.
315 * Loop servicing I/O requests.
316 * Copy the requested data into or out of the memory filesystem
321 mfs_start(struct mount *mp, int flags, struct thread *td)
323 register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
324 register struct mfsnode *mfsp = VTOMFS(vp);
325 register struct buf *bp;
326 register int gotsig = 0, sig;
329 * We must prevent the system from trying to swap
330 * out or kill ( when swap space is low, see vm/pageout.c ) the
331 * process. A deadlock can occur if the process is swapped out,
332 * and the system can loop trying to kill the unkillable ( while
333 * references exist ) MFS process when swap space is low.
338 while (mfsp->mfs_active) {
343 while ((bp = bufq_first(&mfsp->buf_queue)) != NULL) {
344 bufq_remove(&mfsp->buf_queue, bp);
354 * If a non-ignored signal is received, try to unmount.
355 * If that fails, clear the signal (it has been "processed"),
356 * otherwise we will loop here, as tsleep will always return
360 * Note that dounmount() may fail if work was queued after
361 * we slept. We have to jump hoops here to make sure that we
362 * process any buffers after the sleep, before we dounmount()
366 if (dounmount(mp, 0, td) != 0) {
367 KKASSERT(td->td_proc);
368 sig = CURSIG(td->td_proc);
370 SIGDELSET(td->td_proc->p_siglist, sig);
373 else if (tsleep((caddr_t)vp, PCATCH, "mfsidl", 0))
374 gotsig++; /* try to unmount in next pass */
380 * Get file system statistics.
383 mfs_statfs(struct mount *mp, struct statfs *sbp, struct thread *td)
387 error = ffs_statfs(mp, sbp, td);
388 sbp->f_type = mp->mnt_vfc->vfc_typenum;
393 * Memory based filesystem initialization.
397 struct vfsconf *vfsp;
400 cdevsw_add(&mfs_cdevsw);