| 1 | /* lfs_vnops.c 4.12 81/11/08 */ |
| 2 | |
| 3 | #include "../h/param.h" |
| 4 | #include "../h/systm.h" |
| 5 | #include "../h/mount.h" |
| 6 | #include "../h/ino.h" |
| 7 | #include "../h/reg.h" |
| 8 | #include "../h/buf.h" |
| 9 | #include "../h/filsys.h" |
| 10 | #include "../h/dir.h" |
| 11 | #include "../h/user.h" |
| 12 | #include "../h/inode.h" |
| 13 | #include "../h/file.h" |
| 14 | #include "../h/conf.h" |
| 15 | #include "../h/stat.h" |
| 16 | #include "../h/inline.h" |
| 17 | |
| 18 | /* |
| 19 | * the fstat system call. |
| 20 | */ |
| 21 | fstat() |
| 22 | { |
| 23 | register struct file *fp; |
| 24 | register struct a { |
| 25 | int fdes; |
| 26 | struct stat *sb; |
| 27 | } *uap; |
| 28 | |
| 29 | uap = (struct a *)u.u_ap; |
| 30 | fp = getf(uap->fdes); |
| 31 | if (fp == NULL) |
| 32 | return; |
| 33 | if (fp->f_flag & FSOCKET) |
| 34 | sostat(fp->f_socket); |
| 35 | else |
| 36 | stat1(fp->f_inode, uap->sb); |
| 37 | } |
| 38 | |
| 39 | /* |
| 40 | * Stat system call. |
| 41 | */ |
| 42 | stat() |
| 43 | { |
| 44 | register struct inode *ip; |
| 45 | register struct a { |
| 46 | char *fname; |
| 47 | struct stat *sb; |
| 48 | } *uap; |
| 49 | |
| 50 | uap = (struct a *)u.u_ap; |
| 51 | ip = namei(uchar, 0); |
| 52 | if (ip == NULL) |
| 53 | return; |
| 54 | stat1(ip, uap->sb); |
| 55 | iput(ip); |
| 56 | } |
| 57 | |
| 58 | /* |
| 59 | * The basic routine for fstat and stat: |
| 60 | * get the inode and pass appropriate parts back. |
| 61 | */ |
| 62 | stat1(ip, ub) |
| 63 | register struct inode *ip; |
| 64 | struct stat *ub; |
| 65 | { |
| 66 | register struct dinode *dp; |
| 67 | register struct buf *bp; |
| 68 | struct stat ds; |
| 69 | |
| 70 | IUPDAT(ip, &time, &time, 0); |
| 71 | /* |
| 72 | * First copy from inode table |
| 73 | */ |
| 74 | ds.st_dev = ip->i_dev; |
| 75 | ds.st_ino = ip->i_number; |
| 76 | ds.st_mode = ip->i_mode; |
| 77 | ds.st_nlink = ip->i_nlink; |
| 78 | ds.st_uid = ip->i_uid; |
| 79 | ds.st_gid = ip->i_gid; |
| 80 | ds.st_rdev = (dev_t)ip->i_un.i_rdev; |
| 81 | ds.st_size = ip->i_size; |
| 82 | /* |
| 83 | * Next the dates in the disk |
| 84 | */ |
| 85 | bp = bread(ip->i_dev, itod(ip->i_number)); |
| 86 | dp = bp->b_un.b_dino; |
| 87 | dp += itoo(ip->i_number); |
| 88 | ds.st_atime = dp->di_atime; |
| 89 | ds.st_mtime = dp->di_mtime; |
| 90 | ds.st_ctime = dp->di_ctime; |
| 91 | brelse(bp); |
| 92 | if (copyout((caddr_t)&ds, (caddr_t)ub, sizeof(ds)) < 0) |
| 93 | u.u_error = EFAULT; |
| 94 | } |
| 95 | |
| 96 | /* |
| 97 | * Dup system call. |
| 98 | */ |
| 99 | dup() |
| 100 | { |
| 101 | register struct file *fp; |
| 102 | register struct a { |
| 103 | int fdes; |
| 104 | int fdes2; |
| 105 | } *uap; |
| 106 | register i, m; |
| 107 | |
| 108 | uap = (struct a *)u.u_ap; |
| 109 | m = uap->fdes & ~077; |
| 110 | uap->fdes &= 077; |
| 111 | fp = getf(uap->fdes); |
| 112 | if (fp == NULL) |
| 113 | return; |
| 114 | if ((m&0100) == 0) { |
| 115 | if ((i = ufalloc()) < 0) |
| 116 | return; |
| 117 | } else { |
| 118 | i = uap->fdes2; |
| 119 | if (i<0 || i>=NOFILE) { |
| 120 | u.u_error = EBADF; |
| 121 | return; |
| 122 | } |
| 123 | u.u_r.r_val1 = i; |
| 124 | } |
| 125 | if (i != uap->fdes) { |
| 126 | if (u.u_ofile[i]!=NULL) |
| 127 | closef(u.u_ofile[i]); |
| 128 | u.u_ofile[i] = fp; |
| 129 | fp->f_count++; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | /* |
| 134 | * Mount system call. |
| 135 | */ |
| 136 | smount() |
| 137 | { |
| 138 | dev_t dev; |
| 139 | register struct inode *ip; |
| 140 | register struct mount *mp; |
| 141 | struct mount *smp; |
| 142 | register struct filsys *fp; |
| 143 | struct buf *bp; |
| 144 | register struct a { |
| 145 | char *fspec; |
| 146 | char *freg; |
| 147 | int ronly; |
| 148 | } *uap; |
| 149 | register char *cp; |
| 150 | |
| 151 | uap = (struct a *)u.u_ap; |
| 152 | dev = getmdev(); |
| 153 | if (u.u_error) |
| 154 | return; |
| 155 | u.u_dirp = (caddr_t)uap->freg; |
| 156 | ip = namei(uchar, 0); |
| 157 | if (ip == NULL) |
| 158 | return; |
| 159 | if (ip->i_count!=1 || (ip->i_mode&IFMT) != IFDIR) |
| 160 | goto out; |
| 161 | smp = NULL; |
| 162 | for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++) { |
| 163 | if (mp->m_bufp != NULL) { |
| 164 | if (dev == mp->m_dev) |
| 165 | goto out; |
| 166 | } else |
| 167 | if (smp == NULL) |
| 168 | smp = mp; |
| 169 | } |
| 170 | mp = smp; |
| 171 | if (mp == NULL) |
| 172 | goto out; |
| 173 | (*bdevsw[major(dev)].d_open)(dev, !uap->ronly); |
| 174 | if (u.u_error) |
| 175 | goto out; |
| 176 | bp = bread(dev, SUPERB); |
| 177 | if (u.u_error) { |
| 178 | brelse(bp); |
| 179 | goto out1; |
| 180 | } |
| 181 | mp->m_inodp = ip; |
| 182 | mp->m_dev = dev; |
| 183 | bp->b_flags |= B_LOCKED; |
| 184 | mp->m_bufp = bp; |
| 185 | fp = bp->b_un.b_filsys; |
| 186 | fp->s_ilock = 0; |
| 187 | fp->s_flock = 0; |
| 188 | fp->s_ronly = uap->ronly & 1; |
| 189 | fp->s_nbehind = 0; |
| 190 | fp->s_lasti = 1; |
| 191 | u.u_dirp = uap->freg; |
| 192 | for (cp = fp->s_fsmnt; cp < &fp->s_fsmnt[sizeof (fp->s_fsmnt) - 1]; ) |
| 193 | if ((*cp++ = uchar()) == 0) |
| 194 | u.u_dirp--; /* get 0 again */ |
| 195 | *cp = 0; |
| 196 | brelse(bp); |
| 197 | ip->i_flag |= IMOUNT; |
| 198 | irele(ip); |
| 199 | return; |
| 200 | |
| 201 | out: |
| 202 | u.u_error = EBUSY; |
| 203 | out1: |
| 204 | iput(ip); |
| 205 | } |
| 206 | |
| 207 | /* |
| 208 | * the umount system call. |
| 209 | */ |
| 210 | sumount() |
| 211 | { |
| 212 | dev_t dev; |
| 213 | register struct inode *ip; |
| 214 | register struct mount *mp; |
| 215 | struct buf *bp; |
| 216 | int stillopen, flag; |
| 217 | register struct a { |
| 218 | char *fspec; |
| 219 | }; |
| 220 | |
| 221 | dev = getmdev(); |
| 222 | if (u.u_error) |
| 223 | return; |
| 224 | xumount(dev); /* remove unused sticky files from text table */ |
| 225 | update(); |
| 226 | for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++) |
| 227 | if (mp->m_bufp != NULL && dev == mp->m_dev) |
| 228 | goto found; |
| 229 | u.u_error = EINVAL; |
| 230 | return; |
| 231 | |
| 232 | found: |
| 233 | stillopen = 0; |
| 234 | for (ip = inode; ip < inodeNINODE; ip++) |
| 235 | if (ip->i_number != 0 && dev == ip->i_dev) { |
| 236 | u.u_error = EBUSY; |
| 237 | return; |
| 238 | } else if (ip->i_number != 0 && (ip->i_mode&IFMT) == IFBLK && |
| 239 | ip->i_un.i_rdev == dev) |
| 240 | stillopen++; |
| 241 | ip = mp->m_inodp; |
| 242 | ip->i_flag &= ~IMOUNT; |
| 243 | ilock(ip); |
| 244 | iput(ip); |
| 245 | if ((bp = getblk(dev, SUPERB)) != mp->m_bufp) |
| 246 | panic("umount"); |
| 247 | bp->b_flags &= ~B_LOCKED; |
| 248 | flag = !bp->b_un.b_filsys->s_ronly; |
| 249 | mp->m_bufp = NULL; |
| 250 | brelse(bp); |
| 251 | mpurge(mp - &mount[0]); |
| 252 | if (!stillopen) { |
| 253 | (*bdevsw[major(dev)].d_close)(dev, flag); |
| 254 | binval(dev); |
| 255 | } |
| 256 | } |
| 257 | |
| 258 | /* |
| 259 | * Common code for mount and umount. |
| 260 | * Check that the user's argument is a reasonable |
| 261 | * thing on which to mount, and return the device number if so. |
| 262 | */ |
| 263 | dev_t |
| 264 | getmdev() |
| 265 | { |
| 266 | dev_t dev; |
| 267 | register struct inode *ip; |
| 268 | |
| 269 | if (!suser()) |
| 270 | return(NODEV); |
| 271 | ip = namei(uchar, 0); |
| 272 | if (ip == NULL) |
| 273 | return(NODEV); |
| 274 | if ((ip->i_mode&IFMT) != IFBLK) |
| 275 | u.u_error = ENOTBLK; |
| 276 | dev = (dev_t)ip->i_un.i_rdev; |
| 277 | if (major(dev) >= nblkdev) |
| 278 | u.u_error = ENXIO; |
| 279 | iput(ip); |
| 280 | return(dev); |
| 281 | } |