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1.1 root 1: /*
2: * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
3: *
4: * @APPLE_LICENSE_HEADER_START@
5: *
6: * The contents of this file constitute Original Code as defined in and
7: * are subject to the Apple Public Source License Version 1.1 (the
8: * "License"). You may not use this file except in compliance with the
9: * License. Please obtain a copy of the License at
10: * http://www.apple.com/publicsource and read it before using this file.
11: *
12: * This Original Code and all software distributed under the License are
13: * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
14: * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
15: * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
16: * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
17: * License for the specific language governing rights and limitations
18: * under the License.
19: *
20: * @APPLE_LICENSE_HEADER_END@
21: */
22: /* Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved */
23: /*
24: * Copyright (c) 1989, 1990, 1993, 1994
25: * The Regents of the University of California. All rights reserved.
26: *
27: * Redistribution and use in source and binary forms, with or without
28: * modification, are permitted provided that the following conditions
29: * are met:
30: * 1. Redistributions of source code must retain the above copyright
31: * notice, this list of conditions and the following disclaimer.
32: * 2. Redistributions in binary form must reproduce the above copyright
33: * notice, this list of conditions and the following disclaimer in the
34: * documentation and/or other materials provided with the distribution.
35: * 3. All advertising materials mentioning features or use of this software
36: * must display the following acknowledgement:
37: * This product includes software developed by the University of
38: * California, Berkeley and its contributors.
39: * 4. Neither the name of the University nor the names of its contributors
40: * may be used to endorse or promote products derived from this software
41: * without specific prior written permission.
42: *
43: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
44: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
47: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
48: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
49: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
51: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
52: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53: * SUCH DAMAGE.
54: *
55: * @(#)mfs_vfsops.c 8.4 (Berkeley) 4/16/94
56: */
57:
58: #include <sys/param.h>
59: #include <sys/systm.h>
60: #include <sys/time.h>
61: #include <sys/kernel.h>
62: #include <sys/proc.h>
63: #include <sys/buf.h>
64: #include <sys/mount.h>
65: #include <sys/signalvar.h>
66: #include <sys/vnode.h>
67: #include <sys/malloc.h>
68:
69: #include <ufs/ufs/quota.h>
70: #include <ufs/ufs/inode.h>
71: #include <ufs/ufs/ufsmount.h>
72: #include <ufs/ufs/ufs_extern.h>
73:
74: #include <ufs/ffs/fs.h>
75: #include <ufs/ffs/ffs_extern.h>
76:
77: #include <ufs/mfs/mfsnode.h>
78: #include <ufs/mfs/mfs_extern.h>
79:
80: caddr_t mfs_rootbase; /* address of mini-root in kernel virtual memory */
81: u_long mfs_rootsize; /* size of mini-root in bytes */
82:
83: static int mfs_minor; /* used for building internal dev_t */
84:
85: extern int (**mfs_vnodeop_p)();
86:
87: /*
88: * mfs vfs operations.
89: */
90: struct vfsops mfs_vfsops = {
91: MOUNT_MFS,
92: mfs_mount,
93: mfs_start,
94: ffs_unmount,
95: ufs_root,
96: ufs_quotactl,
97: mfs_statfs,
98: ffs_sync,
99: ffs_vget,
100: ffs_fhtovp,
101: ffs_vptofh,
102: mfs_init,
103: };
104:
105: /*
106: * Called by main() when mfs is going to be mounted as root.
107: *
108: * Name is updated by mount(8) after booting.
109: */
110: #define ROOTNAME "mfs_root"
111:
112: mfs_mountroot()
113: {
114: extern struct vnode *rootvp;
115: register struct fs *fs;
116: register struct mount *mp;
117: struct proc *p = kernel_proc; /* XXX - WMG*/
118: struct ufsmount *ump;
119: struct mfsnode *mfsp;
120: size_t size;
121: int error;
122:
123: /*
124: * Get vnodes for swapdev and rootdev.
125: */
126: #if 0
127: if (bdevvp(swapdev, &swapdev_vp) || bdevvp(rootdev, &rootvp))
128: panic("mfs_mountroot: can't setup bdevvp's");
129: #else
130: if ( bdevvp(rootdev, &rootvp))
131: panic("mfs_mountroot: can't setup bdevvp's");
132:
133: #endif
134: MALLOC_ZONE(mp, struct mount *,
135: sizeof(struct mount), M_MOUNT, M_WAITOK);
136: bzero((char *)mp, (u_long)sizeof(struct mount));
137: mp->mnt_op = &mfs_vfsops;
138: mp->mnt_flag = MNT_RDONLY;
139: MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
140: rootvp->v_data = mfsp;
141: rootvp->v_op = mfs_vnodeop_p;
142: rootvp->v_tag = VT_MFS;
143: mfsp->mfs_baseoff = mfs_rootbase;
144: mfsp->mfs_size = mfs_rootsize;
145: mfsp->mfs_vnode = rootvp;
146: mfsp->mfs_pid = p->p_pid;
147: mfsp->mfs_buflist = (struct buf *)0;
148: if (error = ffs_mountfs(rootvp, mp, p)) {
149: _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
150: _FREE(mfsp, M_MFSNODE);
151: return (error);
152: }
153: if (error = vfs_lock(mp)) {
154: (void)ffs_unmount(mp, 0, p);
155: _FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
156: _FREE(mfsp, M_MFSNODE);
157: return (error);
158: }
159: CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
160: mp->mnt_vnodecovered = NULLVP;
161: ump = VFSTOUFS(mp);
162: fs = ump->um_fs;
163: bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
164: fs->fs_fsmnt[0] = '/';
165: bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
166: (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
167: &size);
168: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
169: (void)ffs_statfs(mp, &mp->mnt_stat, p);
170: vfs_unlock(mp);
171: inittodr((time_t)0);
172: return (0);
173: }
174:
175: /*
176: * This is called early in boot to set the base address and size
177: * of the mini-root.
178: */
179: mfs_initminiroot(base)
180: caddr_t base;
181: {
182: struct fs *fs = (struct fs *)(base + SBOFF);
183: extern int (*mountroot)();
184:
185: /* check for valid super block */
186: if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
187: fs->fs_bsize < sizeof(struct fs))
188: return (0);
189: mountroot = mfs_mountroot;
190: mfs_rootbase = base;
191: mfs_rootsize = fs->fs_fsize * fs->fs_size;
192: rootdev = makedev(255, mfs_minor++);
193: return (mfs_rootsize);
194: }
195:
196: /*
197: * VFS Operations.
198: *
199: * mount system call
200: */
201: /* ARGSUSED */
202: int
203: mfs_mount(mp, path, data, ndp, p)
204: register struct mount *mp;
205: char *path;
206: caddr_t data;
207: struct nameidata *ndp;
208: struct proc *p;
209: {
210: struct vnode *devvp;
211: struct mfs_args args;
212: struct ufsmount *ump;
213: register struct fs *fs;
214: register struct mfsnode *mfsp;
215: size_t size;
216: int flags, error;
217:
218: if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
219: return (error);
220:
221: /*
222: * If updating, check whether changing from read-only to
223: * read/write; if there is no device name, that's all we do.
224: */
225: if (mp->mnt_flag & MNT_UPDATE) {
226: ump = VFSTOUFS(mp);
227: fs = ump->um_fs;
228: if (fs->fs_ronly == 0 && (mp->mnt_flag & MNT_RDONLY)) {
229: flags = WRITECLOSE;
230: if (mp->mnt_flag & MNT_FORCE)
231: flags |= FORCECLOSE;
232: if (vfs_busy(mp))
233: return (EBUSY);
234: error = ffs_flushfiles(mp, flags, p);
235: vfs_unbusy(mp);
236: if (error)
237: return (error);
238: }
239: if (fs->fs_ronly && (mp->mnt_flag & MNT_WANTRDWR))
240: fs->fs_ronly = 0;
241: #ifdef EXPORTMFS
242: if (args.fspec == 0)
243: return (vfs_export(mp, &ump->um_export, &args.export));
244: #endif
245: return (0);
246: }
247: MALLOC(mfsp, struct mfsnode *, sizeof(struct mfsnode), M_MFSNODE, M_WAITOK);
248: error = getnewvnode(VT_MFS, (struct mount *)0, mfs_vnodeop_p, &devvp);
249: if (error) {
250: FREE(mfsp, M_MFSNODE);
251: return (error);
252: }
253: devvp->v_type = VBLK;
254: if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
255: panic("mfs_mount: dup dev");
256: devvp->v_data = mfsp;
257: mfsp->mfs_baseoff = args.base;
258: mfsp->mfs_size = args.size;
259: mfsp->mfs_vnode = devvp;
260: mfsp->mfs_pid = p->p_pid;
261: mfsp->mfs_buflist = (struct buf *)0;
262: if (error = ffs_mountfs(devvp, mp, p)) {
263: mfsp->mfs_buflist = (struct buf *)-1;
264: vrele(devvp);
265: return (error);
266: }
267: ump = VFSTOUFS(mp);
268: fs = ump->um_fs;
269: (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
270: bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
271: bcopy(fs->fs_fsmnt, mp->mnt_stat.f_mntonname, MNAMELEN);
272: (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
273: &size);
274: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
275: return (0);
276: }
277:
278: int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
279:
280: /*
281: * Used to grab the process and keep it in the kernel to service
282: * memory filesystem I/O requests.
283: *
284: * Loop servicing I/O requests.
285: * Copy the requested data into or out of the memory filesystem
286: * address space.
287: */
288: /* ARGSUSED */
289: int
290: mfs_start(mp, flags, p)
291: struct mount *mp;
292: int flags;
293: struct proc *p;
294: {
295: register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
296: register struct mfsnode *mfsp = VTOMFS(vp);
297: register struct buf *bp;
298: register caddr_t base;
299: int error = 0;
300:
301: base = mfsp->mfs_baseoff;
302: while (mfsp->mfs_buflist != (struct buf *)(-1)) {
303: while (bp = mfsp->mfs_buflist) {
304: mfsp->mfs_buflist = bp->b_actf;
305: mfs_doio(bp, base);
306: wakeup((caddr_t)bp);
307: }
308: /*
309: * If a non-ignored signal is received, try to unmount.
310: * If that fails, clear the signal (it has been "processed"),
311: * otherwise we will loop here, as tsleep will always return
312: * EINTR/ERESTART.
313: */
314: if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
315: if (dounmount(mp, 0, p) != 0)
316: CLRSIG(p, CURSIG(p));
317: }
318: return (error);
319: }
320:
321: /*
322: * Get file system statistics.
323: */
324: mfs_statfs(mp, sbp, p)
325: struct mount *mp;
326: struct statfs *sbp;
327: struct proc *p;
328: {
329: int error;
330:
331: error = ffs_statfs(mp, sbp, p);
332: #ifdef COMPAT_09
333: sbp->f_type = 3;
334: #else
335: sbp->f_type = 0;
336: #endif
337: strncpy(&sbp->f_fstypename[0], mp->mnt_op->vfs_name, MFSNAMELEN);
338: sbp->f_fstypename[MFSNAMELEN] = '\0';
339: return (error);
340: }
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