Commit | Line | Data |
---|---|---|
5485e062 | 1 | /* ufs_inode.c 4.9 82/02/27 */ |
5d5124a1 BJ |
2 | |
3 | #include "../h/param.h" | |
4 | #include "../h/systm.h" | |
5 | #include "../h/mount.h" | |
6 | #include "../h/dir.h" | |
7 | #include "../h/user.h" | |
8 | #include "../h/inode.h" | |
9 | #include "../h/ino.h" | |
10 | #include "../h/filsys.h" | |
11 | #include "../h/conf.h" | |
12 | #include "../h/buf.h" | |
13 | #include "../h/inline.h" | |
14 | ||
15 | #define INOHSZ 63 | |
16 | #define INOHASH(dev,ino) (((dev)+(ino))%INOHSZ) | |
17 | short inohash[INOHSZ]; | |
18 | short ifreel; | |
19 | ||
20 | /* | |
21 | * Initialize hash links for inodes | |
22 | * and build inode free list. | |
23 | */ | |
24 | ihinit() | |
25 | { | |
26 | register int i; | |
75105cf0 | 27 | register struct inode *ip = inode; |
5d5124a1 BJ |
28 | |
29 | ifreel = 0; | |
75105cf0 BJ |
30 | for (i = 0; i < ninode-1; i++, ip++) |
31 | ip->i_hlink = i+1; | |
32 | ip->i_hlink = -1; | |
5d5124a1 BJ |
33 | for (i = 0; i < INOHSZ; i++) |
34 | inohash[i] = -1; | |
35 | } | |
36 | ||
37 | /* | |
38 | * Find an inode if it is incore. | |
39 | * This is the equivalent, for inodes, | |
40 | * of ``incore'' in bio.c or ``pfind'' in subr.c. | |
41 | */ | |
42 | struct inode * | |
43 | ifind(dev, ino) | |
7494ef16 BJ |
44 | dev_t dev; |
45 | ino_t ino; | |
5d5124a1 BJ |
46 | { |
47 | register struct inode *ip; | |
48 | ||
49 | for (ip = &inode[inohash[INOHASH(dev,ino)]]; ip != &inode[-1]; | |
50 | ip = &inode[ip->i_hlink]) | |
51 | if (ino==ip->i_number && dev==ip->i_dev) | |
52 | return (ip); | |
53 | return ((struct inode *)0); | |
54 | } | |
55 | ||
56 | /* | |
57 | * Look up an inode by device,inumber. | |
58 | * If it is in core (in the inode structure), | |
59 | * honor the locking protocol. | |
60 | * If it is not in core, read it in from the | |
61 | * specified device. | |
62 | * If the inode is mounted on, perform | |
63 | * the indicated indirection. | |
64 | * In all cases, a pointer to a locked | |
65 | * inode structure is returned. | |
66 | * | |
5d5124a1 BJ |
67 | * panic: no imt -- if the mounted file |
68 | * system is not in the mount table. | |
69 | * "cannot happen" | |
70 | */ | |
71 | struct inode * | |
72 | iget(dev, ino) | |
7494ef16 BJ |
73 | dev_t dev; |
74 | ino_t ino; | |
5d5124a1 BJ |
75 | { |
76 | register struct inode *ip; | |
77 | register struct mount *mp; | |
78 | register struct buf *bp; | |
79 | register struct dinode *dp; | |
80 | register int slot; | |
81 | ||
82 | loop: | |
83 | slot = INOHASH(dev, ino); | |
84 | ip = &inode[inohash[slot]]; | |
85 | while (ip != &inode[-1]) { | |
7494ef16 BJ |
86 | if (ino == ip->i_number && dev == ip->i_dev) { |
87 | if ((ip->i_flag&ILOCK) != 0) { | |
5d5124a1 BJ |
88 | ip->i_flag |= IWANT; |
89 | sleep((caddr_t)ip, PINOD); | |
90 | goto loop; | |
91 | } | |
7494ef16 | 92 | if ((ip->i_flag&IMOUNT) != 0) { |
5d5124a1 | 93 | for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) |
7494ef16 | 94 | if (mp->m_inodp == ip) { |
5d5124a1 BJ |
95 | dev = mp->m_dev; |
96 | ino = ROOTINO; | |
97 | goto loop; | |
98 | } | |
99 | panic("no imt"); | |
100 | } | |
101 | ip->i_count++; | |
102 | ip->i_flag |= ILOCK; | |
103 | return(ip); | |
104 | } | |
105 | ip = &inode[ip->i_hlink]; | |
106 | } | |
7494ef16 | 107 | if (ifreel < 0) { |
945fbb1b | 108 | tablefull("inode"); |
5d5124a1 BJ |
109 | u.u_error = ENFILE; |
110 | return(NULL); | |
111 | } | |
112 | ip = &inode[ifreel]; | |
113 | ifreel = ip->i_hlink; | |
114 | ip->i_hlink = inohash[slot]; | |
115 | inohash[slot] = ip - inode; | |
116 | ip->i_dev = dev; | |
117 | ip->i_number = ino; | |
118 | ip->i_flag = ILOCK; | |
119 | ip->i_count++; | |
120 | ip->i_un.i_lastr = 0; | |
121 | bp = bread(dev, itod(ino)); | |
122 | /* | |
123 | * Check I/O errors | |
124 | */ | |
7494ef16 | 125 | if ((bp->b_flags&B_ERROR) != 0) { |
5d5124a1 BJ |
126 | brelse(bp); |
127 | iput(ip); | |
128 | return(NULL); | |
129 | } | |
130 | dp = bp->b_un.b_dino; | |
131 | dp += itoo(ino); | |
132 | iexpand(ip, dp); | |
133 | brelse(bp); | |
134 | return(ip); | |
135 | } | |
136 | ||
137 | iexpand(ip, dp) | |
7494ef16 BJ |
138 | register struct inode *ip; |
139 | register struct dinode *dp; | |
5d5124a1 BJ |
140 | { |
141 | register char *p1, *p2; | |
142 | register int i; | |
143 | ||
144 | ip->i_mode = dp->di_mode; | |
145 | ip->i_nlink = dp->di_nlink; | |
146 | ip->i_uid = dp->di_uid; | |
147 | ip->i_gid = dp->di_gid; | |
148 | ip->i_size = dp->di_size; | |
149 | p1 = (char *)ip->i_un.i_addr; | |
150 | p2 = (char *)dp->di_addr; | |
151 | for(i=0; i<NADDR; i++) { | |
152 | *p1++ = *p2++; | |
153 | *p1++ = *p2++; | |
154 | *p1++ = *p2++; | |
155 | *p1++ = 0; | |
156 | } | |
157 | } | |
158 | ||
159 | /* | |
160 | * Decrement reference count of | |
161 | * an inode structure. | |
162 | * On the last reference, | |
163 | * write the inode out and if necessary, | |
164 | * truncate and deallocate the file. | |
165 | */ | |
166 | iput(ip) | |
7494ef16 | 167 | register struct inode *ip; |
5d5124a1 BJ |
168 | { |
169 | register int i, x; | |
170 | register struct inode *jp; | |
171 | ||
7494ef16 | 172 | if (ip->i_count == 1) { |
5d5124a1 | 173 | ip->i_flag |= ILOCK; |
7494ef16 | 174 | if (ip->i_nlink <= 0) { |
5d5124a1 BJ |
175 | itrunc(ip); |
176 | ip->i_mode = 0; | |
177 | ip->i_flag |= IUPD|ICHG; | |
178 | ifree(ip->i_dev, ip->i_number); | |
179 | } | |
c0bb1685 | 180 | IUPDAT(ip, &time, &time, 0); |
7494ef16 | 181 | irele(ip); |
5d5124a1 BJ |
182 | i = INOHASH(ip->i_dev, ip->i_number); |
183 | x = ip - inode; | |
184 | if (inohash[i] == x) { | |
185 | inohash[i] = ip->i_hlink; | |
186 | } else { | |
187 | for (jp = &inode[inohash[i]]; jp != &inode[-1]; | |
188 | jp = &inode[jp->i_hlink]) | |
189 | if (jp->i_hlink == x) { | |
190 | jp->i_hlink = ip->i_hlink; | |
191 | goto done; | |
192 | } | |
193 | panic("iput"); | |
194 | } | |
195 | done: | |
196 | ip->i_hlink = ifreel; | |
197 | ifreel = x; | |
198 | ip->i_flag = 0; | |
199 | ip->i_number = 0; | |
200 | } else | |
7494ef16 | 201 | irele(ip); |
5d5124a1 BJ |
202 | ip->i_count--; |
203 | } | |
204 | ||
205 | /* | |
206 | * Check accessed and update flags on | |
207 | * an inode structure. | |
208 | * If any is on, update the inode | |
209 | * with the current time. | |
c0bb1685 BJ |
210 | * If waitfor is given, then must insure |
211 | * i/o order so wait for write to complete. | |
5d5124a1 | 212 | */ |
c0bb1685 | 213 | iupdat(ip, ta, tm, waitfor) |
7494ef16 BJ |
214 | register struct inode *ip; |
215 | time_t *ta, *tm; | |
216 | int waitfor; | |
5d5124a1 BJ |
217 | { |
218 | register struct buf *bp; | |
219 | struct dinode *dp; | |
220 | register char *p1, *p2; | |
221 | register int i; | |
222 | ||
7494ef16 BJ |
223 | if ((ip->i_flag&(IUPD|IACC|ICHG)) != 0) { |
224 | if (getfs(ip->i_dev)->s_ronly) | |
5d5124a1 BJ |
225 | return; |
226 | bp = bread(ip->i_dev, itod(ip->i_number)); | |
227 | if (bp->b_flags & B_ERROR) { | |
228 | brelse(bp); | |
229 | return; | |
230 | } | |
231 | dp = bp->b_un.b_dino; | |
232 | dp += itoo(ip->i_number); | |
233 | dp->di_mode = ip->i_mode; | |
234 | dp->di_nlink = ip->i_nlink; | |
235 | dp->di_uid = ip->i_uid; | |
236 | dp->di_gid = ip->i_gid; | |
237 | dp->di_size = ip->i_size; | |
238 | p1 = (char *)dp->di_addr; | |
239 | p2 = (char *)ip->i_un.i_addr; | |
240 | for(i=0; i<NADDR; i++) { | |
241 | *p1++ = *p2++; | |
242 | *p1++ = *p2++; | |
243 | *p1++ = *p2++; | |
7494ef16 | 244 | if (*p2++ != 0) |
5d5124a1 BJ |
245 | printf("iaddress > 2^24\n"); |
246 | } | |
7494ef16 | 247 | if (ip->i_flag&IACC) |
5d5124a1 | 248 | dp->di_atime = *ta; |
7494ef16 | 249 | if (ip->i_flag&IUPD) |
5d5124a1 | 250 | dp->di_mtime = *tm; |
7494ef16 | 251 | if (ip->i_flag&ICHG) |
5d5124a1 BJ |
252 | dp->di_ctime = time; |
253 | ip->i_flag &= ~(IUPD|IACC|ICHG); | |
c0bb1685 BJ |
254 | if (waitfor) |
255 | bwrite(bp); | |
256 | else | |
257 | bdwrite(bp); | |
5d5124a1 BJ |
258 | } |
259 | } | |
260 | ||
261 | /* | |
262 | * Free all the disk blocks associated | |
263 | * with the specified inode structure. | |
264 | * The blocks of the file are removed | |
265 | * in reverse order. This FILO | |
266 | * algorithm will tend to maintain | |
267 | * a contiguous free list much longer | |
268 | * than FIFO. | |
269 | */ | |
270 | itrunc(ip) | |
7494ef16 | 271 | register struct inode *ip; |
5d5124a1 BJ |
272 | { |
273 | register i; | |
274 | dev_t dev; | |
275 | daddr_t bn; | |
c0bb1685 | 276 | struct inode itmp; |
5d5124a1 | 277 | |
5d5124a1 | 278 | i = ip->i_mode & IFMT; |
5485e062 | 279 | if (i!=IFREG && i!=IFDIR && i!=IFLNK) |
5d5124a1 | 280 | return; |
c0bb1685 BJ |
281 | |
282 | /* | |
283 | * Clean inode on disk before freeing blocks | |
284 | * to insure no duplicates if system crashes. | |
285 | */ | |
286 | itmp = *ip; | |
287 | itmp.i_size = 0; | |
288 | for (i = 0; i < NADDR; i++) | |
289 | itmp.i_un.i_addr[i] = 0; | |
290 | itmp.i_flag |= ICHG|IUPD; | |
291 | iupdat(&itmp, &time, &time, 1); | |
292 | ip->i_flag &= ~(IUPD|IACC|ICHG); | |
293 | ||
294 | /* | |
295 | * Now return blocks to free list... if machine | |
296 | * crashes, they will be harmless MISSING blocks. | |
297 | */ | |
5d5124a1 BJ |
298 | dev = ip->i_dev; |
299 | for(i=NADDR-1; i>=0; i--) { | |
300 | bn = ip->i_un.i_addr[i]; | |
7494ef16 | 301 | if (bn == (daddr_t)0) |
5d5124a1 BJ |
302 | continue; |
303 | ip->i_un.i_addr[i] = (daddr_t)0; | |
304 | switch(i) { | |
305 | ||
306 | default: | |
307 | free(dev, bn); | |
308 | break; | |
309 | ||
310 | case NADDR-3: | |
311 | tloop(dev, bn, 0, 0); | |
312 | break; | |
313 | ||
314 | case NADDR-2: | |
315 | tloop(dev, bn, 1, 0); | |
316 | break; | |
317 | ||
318 | case NADDR-1: | |
319 | tloop(dev, bn, 1, 1); | |
320 | } | |
321 | } | |
322 | ip->i_size = 0; | |
c0bb1685 BJ |
323 | /* |
324 | * Inode was written and flags updated above. | |
325 | * No need to modify flags here. | |
326 | */ | |
5d5124a1 BJ |
327 | } |
328 | ||
329 | tloop(dev, bn, f1, f2) | |
330 | dev_t dev; | |
331 | daddr_t bn; | |
332 | { | |
333 | register i; | |
334 | register struct buf *bp; | |
335 | register daddr_t *bap; | |
336 | daddr_t nb; | |
337 | ||
338 | bp = NULL; | |
339 | for(i=NINDIR-1; i>=0; i--) { | |
7494ef16 | 340 | if (bp == NULL) { |
5d5124a1 BJ |
341 | bp = bread(dev, bn); |
342 | if (bp->b_flags & B_ERROR) { | |
343 | brelse(bp); | |
344 | return; | |
345 | } | |
346 | bap = bp->b_un.b_daddr; | |
347 | } | |
348 | nb = bap[i]; | |
7494ef16 | 349 | if (nb == (daddr_t)0) |
5d5124a1 | 350 | continue; |
7494ef16 | 351 | if (f1) { |
5d5124a1 BJ |
352 | brelse(bp); |
353 | bp = NULL; | |
354 | tloop(dev, nb, f2, 0); | |
355 | } else | |
356 | free(dev, nb); | |
357 | } | |
7494ef16 | 358 | if (bp != NULL) |
5d5124a1 BJ |
359 | brelse(bp); |
360 | free(dev, bn); | |
361 | } | |
362 | ||
363 | /* | |
364 | * Make a new file. | |
365 | */ | |
366 | struct inode * | |
367 | maknode(mode) | |
368 | { | |
369 | register struct inode *ip; | |
370 | ||
371 | ip = ialloc(u.u_pdir->i_dev); | |
7494ef16 | 372 | if (ip == NULL) { |
5d5124a1 BJ |
373 | iput(u.u_pdir); |
374 | return(NULL); | |
375 | } | |
376 | ip->i_flag |= IACC|IUPD|ICHG; | |
7494ef16 | 377 | if ((mode&IFMT) == 0) |
5d5124a1 BJ |
378 | mode |= IFREG; |
379 | ip->i_mode = mode & ~u.u_cmask; | |
380 | ip->i_nlink = 1; | |
381 | ip->i_uid = u.u_uid; | |
4f4caf05 | 382 | ip->i_gid = u.u_pdir->i_gid; |
c0bb1685 BJ |
383 | |
384 | /* | |
385 | * Make sure inode goes to disk before directory entry. | |
386 | */ | |
387 | iupdat(ip, &time, &time, 1); | |
388 | ||
5d5124a1 BJ |
389 | wdir(ip); |
390 | return(ip); | |
391 | } | |
392 | ||
393 | /* | |
394 | * Write a directory entry with | |
395 | * parameters left as side effects | |
396 | * to a call to namei. | |
397 | */ | |
398 | wdir(ip) | |
7494ef16 | 399 | struct inode *ip; |
5d5124a1 BJ |
400 | { |
401 | ||
402 | u.u_dent.d_ino = ip->i_number; | |
403 | bcopy((caddr_t)u.u_dbuf, (caddr_t)u.u_dent.d_name, DIRSIZ); | |
404 | u.u_count = sizeof(struct direct); | |
405 | u.u_segflg = 1; | |
406 | u.u_base = (caddr_t)&u.u_dent; | |
407 | writei(u.u_pdir); | |
408 | iput(u.u_pdir); | |
409 | } | |
d6a210b8 | 410 | |
7494ef16 BJ |
411 | #ifdef ilock |
412 | #undef ilock | |
d6a210b8 | 413 | #endif |
7494ef16 BJ |
414 | #ifdef irele |
415 | #undef irele | |
d6a210b8 BJ |
416 | #endif |
417 | /* | |
7494ef16 | 418 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
d6a210b8 | 419 | */ |
7494ef16 BJ |
420 | ilock(ip) |
421 | register struct inode *ip; | |
d6a210b8 BJ |
422 | { |
423 | ||
7494ef16 | 424 | while (ip->i_flag&ILOCK) { |
d6a210b8 BJ |
425 | ip->i_flag |= IWANT; |
426 | sleep((caddr_t)ip, PINOD); | |
427 | } | |
428 | ip->i_flag |= ILOCK; | |
429 | } | |
430 | ||
431 | /* | |
7494ef16 | 432 | * Unlock an inode. If WANT bit is on, wakeup. |
d6a210b8 | 433 | */ |
7494ef16 BJ |
434 | irele(ip) |
435 | register struct inode *ip; | |
d6a210b8 BJ |
436 | { |
437 | ||
438 | ip->i_flag &= ~ILOCK; | |
7494ef16 | 439 | if (ip->i_flag&IWANT) { |
d6a210b8 BJ |
440 | ip->i_flag &= ~IWANT; |
441 | wakeup((caddr_t)ip); | |
442 | } | |
443 | } |