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1.1 root 1: /*
2: * Copyright (c) 1989, 1990 The Regents of the University of California.
3: * All rights reserved.
4: *
5: * Redistribution and use in source and binary forms, with or without
6: * modification, are permitted provided that the following conditions
7: * are met:
8: * 1. Redistributions of source code must retain the above copyright
9: * notice, this list of conditions and the following disclaimer.
10: * 2. Redistributions in binary form must reproduce the above copyright
11: * notice, this list of conditions and the following disclaimer in the
12: * documentation and/or other materials provided with the distribution.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by the University of
16: * California, Berkeley and its contributors.
17: * 4. Neither the name of the University nor the names of its contributors
18: * may be used to endorse or promote products derived from this software
19: * without specific prior written permission.
20: *
21: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31: * SUCH DAMAGE.
32: *
33: * @(#)mfs_vfsops.c 7.19 (Berkeley) 4/16/91
34: */
35:
36: #include "param.h"
37: #include "time.h"
38: #include "kernel.h"
39: #include "proc.h"
40: #include "buf.h"
41: #include "mount.h"
42: #include "signalvar.h"
43: #include "vnode.h"
44:
45: #include "quota.h"
46: #include "inode.h"
47: #include "ufsmount.h"
48: #include "mfsnode.h"
49: #include "fs.h"
50:
51: extern struct vnodeops mfs_vnodeops;
52:
53: /*
54: * mfs vfs operations.
55: */
56: int mfs_mount();
57: int mfs_start();
58: int ufs_unmount();
59: int ufs_root();
60: int ufs_quotactl();
61: int mfs_statfs();
62: int ufs_sync();
63: int ufs_fhtovp();
64: int ufs_vptofh();
65: int mfs_init();
66:
67: struct vfsops mfs_vfsops = {
68: mfs_mount,
69: mfs_start,
70: ufs_unmount,
71: ufs_root,
72: ufs_quotactl,
73: mfs_statfs,
74: ufs_sync,
75: ufs_fhtovp,
76: ufs_vptofh,
77: mfs_init,
78: };
79:
80: /*
81: * VFS Operations.
82: *
83: * mount system call
84: */
85: /* ARGSUSED */
86: mfs_mount(mp, path, data, ndp, p)
87: register struct mount *mp;
88: char *path;
89: caddr_t data;
90: struct nameidata *ndp;
91: struct proc *p;
92: {
93: struct vnode *devvp;
94: struct mfs_args args;
95: struct ufsmount *ump;
96: register struct fs *fs;
97: register struct mfsnode *mfsp;
98: static int mfs_minor;
99: u_int size;
100: int error;
101:
102: if (mp->mnt_flag & MNT_UPDATE) {
103: ump = VFSTOUFS(mp);
104: fs = ump->um_fs;
105: if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
106: fs->fs_ronly = 0;
107: return (0);
108: }
109: if (error = copyin(data, (caddr_t)&args, sizeof (struct mfs_args)))
110: return (error);
111: error = getnewvnode(VT_MFS, (struct mount *)0, &mfs_vnodeops, &devvp);
112: if (error)
113: return (error);
114: devvp->v_type = VBLK;
115: if (checkalias(devvp, makedev(255, mfs_minor++), (struct mount *)0))
116: panic("mfs_mount: dup dev");
117: mfsp = VTOMFS(devvp);
118: mfsp->mfs_baseoff = args.base;
119: mfsp->mfs_size = args.size;
120: mfsp->mfs_vnode = devvp;
121: mfsp->mfs_pid = p->p_pid;
122: mfsp->mfs_buflist = (struct buf *)0;
123: if (error = mountfs(devvp, mp)) {
124: mfsp->mfs_buflist = (struct buf *)-1;
125: vrele(devvp);
126: return (error);
127: }
128: ump = VFSTOUFS(mp);
129: fs = ump->um_fs;
130: (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
131: bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
132: bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
133: MNAMELEN);
134: (void) copyinstr(args.name, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
135: &size);
136: bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
137: (void) mfs_statfs(mp, &mp->mnt_stat);
138: return (0);
139: }
140:
141: int mfs_pri = PWAIT | PCATCH; /* XXX prob. temp */
142:
143: /*
144: * Used to grab the process and keep it in the kernel to service
145: * memory filesystem I/O requests.
146: *
147: * Loop servicing I/O requests.
148: * Copy the requested data into or out of the memory filesystem
149: * address space.
150: */
151: /* ARGSUSED */
152: mfs_start(mp, flags, p)
153: struct mount *mp;
154: int flags;
155: struct proc *p;
156: {
157: register struct vnode *vp = VFSTOUFS(mp)->um_devvp;
158: register struct mfsnode *mfsp = VTOMFS(vp);
159: register struct buf *bp;
160: register caddr_t base;
161: int error = 0;
162:
163: base = mfsp->mfs_baseoff;
164: while (mfsp->mfs_buflist != (struct buf *)(-1)) {
165: while (bp = mfsp->mfs_buflist) {
166: mfsp->mfs_buflist = bp->av_forw;
167: mfs_doio(bp, base);
168: wakeup((caddr_t)bp);
169: }
170: /*
171: * If a non-ignored signal is received, try to unmount.
172: * If that fails, clear the signal (it has been "processed"),
173: * otherwise we will loop here, as tsleep will always return
174: * EINTR/ERESTART.
175: */
176: if (error = tsleep((caddr_t)vp, mfs_pri, "mfsidl", 0))
177: if (dounmount(mp, MNT_NOFORCE, p) != 0)
178: CLRSIG(p, CURSIG(p));
179: }
180: return (error);
181: }
182:
183: /*
184: * Get file system statistics.
185: */
186: mfs_statfs(mp, sbp, p)
187: struct mount *mp;
188: struct statfs *sbp;
189: struct proc *p;
190: {
191: int error;
192:
193: error = ufs_statfs(mp, sbp, p);
194: sbp->f_type = MOUNT_MFS;
195: return (error);
196: }
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