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15637ed4 RG |
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 | } |