Commit | Line | Data |
---|---|---|
3e63ef5b | 1 | /* lfs_inode.c 4.24 82/09/06 */ |
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" | |
6459ebe0 | 9 | #include "../h/fs.h" |
5d5124a1 BJ |
10 | #include "../h/conf.h" |
11 | #include "../h/buf.h" | |
12 | #include "../h/inline.h" | |
b4567e9c | 13 | #ifdef QUOTA |
4147b3f6 BJ |
14 | #include "../h/quota.h" |
15 | #endif | |
3e63ef5b | 16 | #include "../h/kernel.h" |
5d5124a1 BJ |
17 | |
18 | #define INOHSZ 63 | |
3ebac878 RE |
19 | #if ((INOHSZ&(INOHSZ-1)) == 0) |
20 | #define INOHASH(dev,ino) (((dev)+(ino))&(INOHSZ-1)) | |
21 | #else | |
5d5124a1 | 22 | #define INOHASH(dev,ino) (((dev)+(ino))%INOHSZ) |
3ebac878 RE |
23 | #endif |
24 | ||
25 | union ihead { /* inode LRU cache, Chris Maltby */ | |
26 | union ihead *ih_head[2]; | |
27 | struct inode *ih_chain[2]; | |
28 | } ihead[INOHSZ]; | |
29 | ||
30 | struct inode *ifreeh, **ifreet; | |
5d5124a1 BJ |
31 | |
32 | /* | |
33 | * Initialize hash links for inodes | |
34 | * and build inode free list. | |
35 | */ | |
36 | ihinit() | |
37 | { | |
38 | register int i; | |
75105cf0 | 39 | register struct inode *ip = inode; |
3ebac878 | 40 | register union ihead *ih = ihead; |
5d5124a1 | 41 | |
3ebac878 RE |
42 | for (i = INOHSZ; --i >= 0; ih++) { |
43 | ih->ih_head[0] = ih; | |
44 | ih->ih_head[1] = ih; | |
45 | } | |
46 | ifreeh = ip; | |
47 | ifreet = &ip->i_freef; | |
48 | ip->i_freeb = &ifreeh; | |
49 | ip->i_forw = ip; | |
50 | ip->i_back = ip; | |
51 | for (i = ninode; --i > 0; ) { | |
52 | ++ip; | |
53 | ip->i_forw = ip; | |
54 | ip->i_back = ip; | |
55 | *ifreet = ip; | |
56 | ip->i_freeb = ifreet; | |
57 | ifreet = &ip->i_freef; | |
58 | } | |
59 | ip->i_freef = NULL; | |
5d5124a1 BJ |
60 | } |
61 | ||
3ebac878 RE |
62 | #ifdef notdef |
63 | /* | |
64 | * Find an inode if it is incore. | |
65 | * This is the equivalent, for inodes, | |
66 | * of ``incore'' in bio.c or ``pfind'' in subr.c. | |
67 | */ | |
68 | struct inode * | |
69 | ifind(dev, ino) | |
70 | dev_t dev; | |
71 | ino_t ino; | |
72 | { | |
73 | register struct inode *ip; | |
74 | register union ihead *ih; | |
75 | ||
76 | ih = &ihead[INOHASH(dev, ino)]; | |
77 | for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw) | |
78 | if (ino==ip->i_number && dev==ip->i_dev) | |
79 | return (ip); | |
80 | return ((struct inode *)0); | |
81 | } | |
82 | #endif notdef | |
83 | ||
5d5124a1 BJ |
84 | /* |
85 | * Look up an inode by device,inumber. | |
86 | * If it is in core (in the inode structure), | |
87 | * honor the locking protocol. | |
88 | * If it is not in core, read it in from the | |
89 | * specified device. | |
90 | * If the inode is mounted on, perform | |
91 | * the indicated indirection. | |
92 | * In all cases, a pointer to a locked | |
93 | * inode structure is returned. | |
94 | * | |
5d5124a1 BJ |
95 | * panic: no imt -- if the mounted file |
96 | * system is not in the mount table. | |
97 | * "cannot happen" | |
98 | */ | |
99 | struct inode * | |
6459ebe0 | 100 | iget(dev, fs, ino) |
7494ef16 | 101 | dev_t dev; |
6459ebe0 | 102 | register struct fs *fs; |
7494ef16 | 103 | ino_t ino; |
5d5124a1 | 104 | { |
32dc2b7e RE |
105 | register struct inode *ip; |
106 | register union ihead *ih; | |
5d5124a1 BJ |
107 | register struct mount *mp; |
108 | register struct buf *bp; | |
109 | register struct dinode *dp; | |
3ebac878 | 110 | register struct inode *iq; |
5d5124a1 BJ |
111 | |
112 | loop: | |
6459ebe0 KM |
113 | if (getfs(dev) != fs) |
114 | panic("iget: bad fs"); | |
3ebac878 RE |
115 | ih = &ihead[INOHASH(dev, ino)]; |
116 | for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw) | |
7494ef16 BJ |
117 | if (ino == ip->i_number && dev == ip->i_dev) { |
118 | if ((ip->i_flag&ILOCK) != 0) { | |
5d5124a1 BJ |
119 | ip->i_flag |= IWANT; |
120 | sleep((caddr_t)ip, PINOD); | |
121 | goto loop; | |
122 | } | |
7494ef16 | 123 | if ((ip->i_flag&IMOUNT) != 0) { |
6459ebe0 | 124 | for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++) |
3ebac878 RE |
125 | if(mp->m_inodp == ip) { |
126 | dev = mp->m_dev; | |
127 | fs = mp->m_bufp->b_un.b_fs; | |
128 | ino = ROOTINO; | |
129 | goto loop; | |
130 | } | |
5d5124a1 BJ |
131 | panic("no imt"); |
132 | } | |
3ebac878 RE |
133 | if (ip->i_count == 0) { /* ino on free list */ |
134 | if (iq = ip->i_freef) | |
135 | iq->i_freeb = ip->i_freeb; | |
136 | else | |
137 | ifreet = ip->i_freeb; | |
138 | *ip->i_freeb = iq; | |
139 | ip->i_freef = NULL; | |
140 | ip->i_freeb = NULL; | |
141 | } | |
5d5124a1 BJ |
142 | ip->i_count++; |
143 | ip->i_flag |= ILOCK; | |
144 | return(ip); | |
145 | } | |
3ebac878 RE |
146 | |
147 | if ((ip = ifreeh) == NULL) { | |
945fbb1b | 148 | tablefull("inode"); |
5d5124a1 BJ |
149 | u.u_error = ENFILE; |
150 | return(NULL); | |
151 | } | |
3ebac878 RE |
152 | if (iq = ip->i_freef) |
153 | iq->i_freeb = &ifreeh; | |
154 | ifreeh = iq; | |
155 | ip->i_freef = NULL; | |
156 | ip->i_freeb = NULL; | |
157 | /* | |
158 | * Now to take inode off the hash chain it was on | |
159 | * (initially, or after an iflush, it is on a "hash chain" | |
160 | * consisting entirely of itself, and pointed to by no-one, | |
161 | * but that doesn't matter), and put it on the chain for | |
162 | * its new (ino, dev) pair | |
163 | */ | |
32dc2b7e RE |
164 | remque(ip); |
165 | insque(ip, ih); | |
b4567e9c | 166 | #ifdef QUOTA |
89045c38 RE |
167 | dqrele(ip->i_dquot); |
168 | #endif | |
5d5124a1 | 169 | ip->i_dev = dev; |
6459ebe0 | 170 | ip->i_fs = fs; |
5d5124a1 BJ |
171 | ip->i_number = ino; |
172 | ip->i_flag = ILOCK; | |
173 | ip->i_count++; | |
6459ebe0 KM |
174 | ip->i_lastr = 0; |
175 | bp = bread(dev, fsbtodb(fs, itod(fs, ino)), fs->fs_bsize); | |
5d5124a1 BJ |
176 | /* |
177 | * Check I/O errors | |
178 | */ | |
7494ef16 | 179 | if ((bp->b_flags&B_ERROR) != 0) { |
5d5124a1 | 180 | brelse(bp); |
3ebac878 RE |
181 | /* |
182 | * the inode doesn't contain anything useful, so it would | |
183 | * be misleading to leave it on its hash chain. | |
184 | * 'iput' will take care of putting it back on the free list. | |
185 | */ | |
32dc2b7e | 186 | remque(ip); |
3ebac878 RE |
187 | ip->i_forw = ip; |
188 | ip->i_back = ip; | |
189 | /* | |
190 | * we also loose its inumber, just in case (as iput | |
191 | * doesn't do that any more) - but as it isn't on its | |
192 | * hash chain, I doubt if this is really necessary .. kre | |
193 | * (probably the two methods are interchangable) | |
194 | */ | |
195 | ip->i_number = 0; | |
b4567e9c | 196 | #ifdef QUOTA |
89045c38 RE |
197 | ip->i_dquot = NODQUOT; |
198 | #endif | |
5d5124a1 BJ |
199 | iput(ip); |
200 | return(NULL); | |
201 | } | |
202 | dp = bp->b_un.b_dino; | |
6459ebe0 KM |
203 | dp += itoo(fs, ino); |
204 | ip->i_ic = dp->di_ic; | |
5d5124a1 | 205 | brelse(bp); |
b4567e9c | 206 | #ifdef QUOTA |
89045c38 RE |
207 | if (ip->i_mode == 0) |
208 | ip->i_dquot = NODQUOT; | |
209 | else | |
210 | ip->i_dquot = inoquota(ip); | |
211 | #endif | |
6459ebe0 | 212 | return (ip); |
5d5124a1 BJ |
213 | } |
214 | ||
215 | /* | |
216 | * Decrement reference count of | |
217 | * an inode structure. | |
218 | * On the last reference, | |
219 | * write the inode out and if necessary, | |
220 | * truncate and deallocate the file. | |
221 | */ | |
222 | iput(ip) | |
7494ef16 | 223 | register struct inode *ip; |
5d5124a1 | 224 | { |
ff56f48a KM |
225 | |
226 | if ((ip->i_flag & ILOCK) == 0) | |
227 | panic("iput"); | |
228 | iunlock(ip); | |
229 | irele(ip); | |
230 | } | |
231 | ||
232 | irele(ip) | |
233 | register struct inode *ip; | |
234 | { | |
5d5124a1 BJ |
235 | register int i, x; |
236 | register struct inode *jp; | |
6459ebe0 | 237 | int mode; |
5d5124a1 | 238 | |
7494ef16 | 239 | if (ip->i_count == 1) { |
5d5124a1 | 240 | ip->i_flag |= ILOCK; |
7494ef16 | 241 | if (ip->i_nlink <= 0) { |
528f664c | 242 | itrunc(ip, 0); |
6459ebe0 | 243 | mode = ip->i_mode; |
5d5124a1 | 244 | ip->i_mode = 0; |
85f9cfb8 | 245 | ip->i_rdev = 0; |
5d5124a1 | 246 | ip->i_flag |= IUPD|ICHG; |
6459ebe0 | 247 | ifree(ip, ip->i_number, mode); |
b4567e9c | 248 | #ifdef QUOTA |
89045c38 RE |
249 | chkiq(ip->i_dev, ip, ip->i_uid, 0); |
250 | dqrele(ip->i_dquot); | |
251 | ip->i_dquot = NODQUOT; | |
252 | #endif | |
5d5124a1 | 253 | } |
3e63ef5b | 254 | IUPDAT(ip, &time.tv_sec, &time.tv_sec, 0); |
ff56f48a | 255 | iunlock(ip); |
3ebac878 RE |
256 | ip->i_flag = 0; |
257 | /* | |
258 | * Put the inode on the end of the free list. | |
259 | * Possibly in some cases it would be better to | |
260 | * put the inode at the head of the free list, | |
261 | * (eg: where i_mode == 0 || i_number == 0) | |
262 | * but I will think about that later .. kre | |
263 | * (i_number is rarely 0 - only after an i/o error in iget, | |
264 | * where i_mode == 0, the inode will probably be wanted | |
265 | * again soon for an ialloc, so possibly we should keep it) | |
266 | */ | |
267 | if (ifreeh) { | |
268 | *ifreet = ip; | |
269 | ip->i_freeb = ifreet; | |
5d5124a1 | 270 | } else { |
3ebac878 RE |
271 | ifreeh = ip; |
272 | ip->i_freeb = &ifreeh; | |
5d5124a1 | 273 | } |
3ebac878 RE |
274 | ip->i_freef = NULL; |
275 | ifreet = &ip->i_freef; | |
ff56f48a | 276 | } |
5d5124a1 BJ |
277 | ip->i_count--; |
278 | } | |
279 | ||
280 | /* | |
281 | * Check accessed and update flags on | |
282 | * an inode structure. | |
283 | * If any is on, update the inode | |
284 | * with the current time. | |
c0bb1685 BJ |
285 | * If waitfor is given, then must insure |
286 | * i/o order so wait for write to complete. | |
5d5124a1 | 287 | */ |
c0bb1685 | 288 | iupdat(ip, ta, tm, waitfor) |
7494ef16 BJ |
289 | register struct inode *ip; |
290 | time_t *ta, *tm; | |
291 | int waitfor; | |
5d5124a1 BJ |
292 | { |
293 | register struct buf *bp; | |
294 | struct dinode *dp; | |
6459ebe0 | 295 | register struct fs *fp; |
5d5124a1 | 296 | |
6459ebe0 KM |
297 | fp = ip->i_fs; |
298 | if ((ip->i_flag & (IUPD|IACC|ICHG)) != 0) { | |
299 | if (fp->fs_ronly) | |
5d5124a1 | 300 | return; |
6459ebe0 KM |
301 | bp = bread(ip->i_dev, fsbtodb(fp, itod(fp, ip->i_number)), |
302 | fp->fs_bsize); | |
5d5124a1 BJ |
303 | if (bp->b_flags & B_ERROR) { |
304 | brelse(bp); | |
305 | return; | |
306 | } | |
7494ef16 | 307 | if (ip->i_flag&IACC) |
6459ebe0 | 308 | ip->i_atime = *ta; |
7494ef16 | 309 | if (ip->i_flag&IUPD) |
6459ebe0 | 310 | ip->i_mtime = *tm; |
7494ef16 | 311 | if (ip->i_flag&ICHG) |
3e63ef5b | 312 | ip->i_ctime = time.tv_sec; |
5d5124a1 | 313 | ip->i_flag &= ~(IUPD|IACC|ICHG); |
c39ea692 RE |
314 | dp = bp->b_un.b_dino + itoo(fp, ip->i_number); |
315 | dp->di_ic = ip->i_ic; | |
c0bb1685 BJ |
316 | if (waitfor) |
317 | bwrite(bp); | |
318 | else | |
319 | bdwrite(bp); | |
5d5124a1 BJ |
320 | } |
321 | } | |
322 | ||
323 | /* | |
528f664c SL |
324 | * Truncate the inode ip to at most |
325 | * length size. Free affected disk | |
326 | * blocks -- the blocks of the file | |
327 | * are removed in reverse order. | |
5d5124a1 | 328 | */ |
528f664c | 329 | itrunc(ip, length) |
7494ef16 | 330 | register struct inode *ip; |
528f664c | 331 | register int length; |
5d5124a1 BJ |
332 | { |
333 | register i; | |
334 | dev_t dev; | |
335 | daddr_t bn; | |
c0bb1685 | 336 | struct inode itmp; |
6459ebe0 | 337 | register struct fs *fs; |
b4567e9c | 338 | #ifdef QUOTA |
89045c38 RE |
339 | register long cnt = 0; |
340 | long tloop(); | |
341 | #endif | |
4a0415d6 SL |
342 | /* |
343 | * Only plain files, directories and symbolic | |
344 | * links contain blocks. | |
345 | */ | |
346 | i = ip->i_mode & IFMT; | |
347 | if (i != IFREG && i != IFDIR && i != IFLNK) | |
348 | return; | |
528f664c SL |
349 | if (ip->i_size <= length) |
350 | return; | |
5d5124a1 | 351 | |
c0bb1685 BJ |
352 | /* |
353 | * Clean inode on disk before freeing blocks | |
354 | * to insure no duplicates if system crashes. | |
355 | */ | |
356 | itmp = *ip; | |
528f664c | 357 | itmp.i_size = length; |
6459ebe0 KM |
358 | for (i = 0; i < NDADDR; i++) |
359 | itmp.i_db[i] = 0; | |
360 | for (i = 0; i < NIADDR; i++) | |
361 | itmp.i_ib[i] = 0; | |
c0bb1685 | 362 | itmp.i_flag |= ICHG|IUPD; |
3e63ef5b | 363 | iupdat(&itmp, &time.tv_sec, &time.tv_sec, 1); |
c0bb1685 BJ |
364 | ip->i_flag &= ~(IUPD|IACC|ICHG); |
365 | ||
366 | /* | |
367 | * Now return blocks to free list... if machine | |
368 | * crashes, they will be harmless MISSING blocks. | |
369 | */ | |
5d5124a1 | 370 | dev = ip->i_dev; |
6459ebe0 KM |
371 | fs = ip->i_fs; |
372 | /* | |
373 | * release double indirect block first | |
374 | */ | |
375 | bn = ip->i_ib[NIADDR-1]; | |
376 | if (bn != (daddr_t)0) { | |
377 | ip->i_ib[NIADDR - 1] = (daddr_t)0; | |
b4567e9c | 378 | #ifdef QUOTA |
89045c38 RE |
379 | cnt += |
380 | #endif | |
381 | tloop(ip, bn, 1); | |
6459ebe0 KM |
382 | } |
383 | /* | |
384 | * release single indirect blocks second | |
385 | */ | |
386 | for (i = NIADDR - 2; i >= 0; i--) { | |
387 | bn = ip->i_ib[i]; | |
388 | if (bn != (daddr_t)0) { | |
389 | ip->i_ib[i] = (daddr_t)0; | |
b4567e9c | 390 | #ifdef QUOTA |
89045c38 RE |
391 | cnt += |
392 | #endif | |
393 | tloop(ip, bn, 0); | |
6459ebe0 KM |
394 | } |
395 | } | |
396 | /* | |
397 | * finally release direct blocks | |
398 | */ | |
399 | for (i = NDADDR - 1; i>=0; i--) { | |
89045c38 RE |
400 | register size; |
401 | ||
6459ebe0 | 402 | bn = ip->i_db[i]; |
7494ef16 | 403 | if (bn == (daddr_t)0) |
5d5124a1 | 404 | continue; |
6459ebe0 | 405 | ip->i_db[i] = (daddr_t)0; |
89045c38 | 406 | fre(ip, bn, size = (off_t)blksize(fs, ip, i)); |
b4567e9c | 407 | #ifdef QUOTA |
89045c38 RE |
408 | cnt += size / DEV_BSIZE; |
409 | #endif | |
5d5124a1 BJ |
410 | } |
411 | ip->i_size = 0; | |
c0bb1685 BJ |
412 | /* |
413 | * Inode was written and flags updated above. | |
414 | * No need to modify flags here. | |
415 | */ | |
b4567e9c | 416 | #ifdef QUOTA |
89045c38 RE |
417 | (void) chkdq(ip, -cnt, 0); |
418 | #endif | |
5d5124a1 BJ |
419 | } |
420 | ||
b4567e9c | 421 | #ifdef QUOTA |
89045c38 RE |
422 | long |
423 | #endif | |
6459ebe0 KM |
424 | tloop(ip, bn, indflg) |
425 | register struct inode *ip; | |
426 | daddr_t bn; | |
427 | int indflg; | |
5d5124a1 BJ |
428 | { |
429 | register i; | |
430 | register struct buf *bp; | |
431 | register daddr_t *bap; | |
6459ebe0 | 432 | register struct fs *fs; |
5d5124a1 | 433 | daddr_t nb; |
b4567e9c | 434 | #ifdef QUOTA |
89045c38 RE |
435 | register long cnt = 0; |
436 | #endif | |
5d5124a1 BJ |
437 | |
438 | bp = NULL; | |
6459ebe0 KM |
439 | fs = ip->i_fs; |
440 | for (i = NINDIR(fs) - 1; i >= 0; i--) { | |
7494ef16 | 441 | if (bp == NULL) { |
6459ebe0 | 442 | bp = bread(ip->i_dev, fsbtodb(fs, bn), fs->fs_bsize); |
5d5124a1 BJ |
443 | if (bp->b_flags & B_ERROR) { |
444 | brelse(bp); | |
445 | return; | |
446 | } | |
447 | bap = bp->b_un.b_daddr; | |
448 | } | |
449 | nb = bap[i]; | |
7494ef16 | 450 | if (nb == (daddr_t)0) |
5d5124a1 | 451 | continue; |
89045c38 | 452 | if (indflg) { |
b4567e9c | 453 | #ifdef QUOTA |
89045c38 RE |
454 | cnt += |
455 | #endif | |
456 | tloop(ip, nb, 0); | |
457 | } else { | |
6459ebe0 | 458 | fre(ip, nb, fs->fs_bsize); |
b4567e9c | 459 | #ifdef QUOTA |
89045c38 RE |
460 | cnt += fs->fs_bsize / DEV_BSIZE; |
461 | #endif | |
462 | } | |
5d5124a1 | 463 | } |
7494ef16 | 464 | if (bp != NULL) |
5d5124a1 | 465 | brelse(bp); |
6459ebe0 | 466 | fre(ip, bn, fs->fs_bsize); |
b4567e9c | 467 | #ifdef QUOTA |
89045c38 RE |
468 | cnt += fs->fs_bsize / DEV_BSIZE; |
469 | return(cnt); | |
470 | #endif | |
5d5124a1 BJ |
471 | } |
472 | ||
3ebac878 RE |
473 | /* |
474 | * remove any inodes in the inode cache belonging to dev | |
475 | * | |
476 | * There should not be any active ones, return error if any are found | |
477 | * (nb: this is a user error, not a system err) | |
478 | * | |
479 | * Also, count the references to dev by block devices - this really | |
480 | * has nothing to do with the object of the procedure, but as we have | |
481 | * to scan the inode table here anyway, we might as well get the | |
482 | * extra benefit. | |
483 | * | |
484 | * this is called from sumount()/sys3.c when dev is being unmounted | |
485 | */ | |
b4567e9c | 486 | #ifdef QUOTA |
4147b3f6 | 487 | iflush(dev, iq) |
89045c38 | 488 | dev_t dev; |
4147b3f6 | 489 | struct inode *iq; |
89045c38 | 490 | #else |
3ebac878 RE |
491 | iflush(dev) |
492 | dev_t dev; | |
89045c38 | 493 | #endif |
3ebac878 | 494 | { |
32dc2b7e | 495 | register struct inode *ip; |
3ebac878 RE |
496 | register open = 0; |
497 | ||
498 | for (ip = inode; ip < inodeNINODE; ip++) { | |
b4567e9c | 499 | #ifdef QUOTA |
89045c38 RE |
500 | if (ip != iq && ip->i_dev == dev) |
501 | #else | |
3ebac878 | 502 | if (ip->i_dev == dev) |
89045c38 | 503 | #endif |
3ebac878 RE |
504 | if (ip->i_count) |
505 | return(-1); | |
506 | else { | |
32dc2b7e | 507 | remque(ip); |
3ebac878 RE |
508 | ip->i_forw = ip; |
509 | ip->i_back = ip; | |
510 | /* | |
511 | * as i_count == 0, the inode was on the free | |
512 | * list already, just leave it there, it will | |
513 | * fall off the bottom eventually. We could | |
514 | * perhaps move it to the head of the free | |
515 | * list, but as umounts are done so | |
516 | * infrequently, we would gain very little, | |
517 | * while making the code bigger. | |
518 | */ | |
b4567e9c | 519 | #ifdef QUOTA |
89045c38 RE |
520 | dqrele(ip->i_dquot); |
521 | ip->i_dquot = NODQUOT; | |
522 | #endif | |
3ebac878 RE |
523 | } |
524 | else if (ip->i_count && (ip->i_mode&IFMT)==IFBLK && | |
525 | ip->i_rdev == dev) | |
526 | open++; | |
527 | } | |
528 | return (open); | |
529 | } | |
530 | ||
7494ef16 BJ |
531 | #ifdef ilock |
532 | #undef ilock | |
d6a210b8 | 533 | #endif |
ff56f48a KM |
534 | #ifdef iunlock |
535 | #undef iunlock | |
d6a210b8 BJ |
536 | #endif |
537 | /* | |
7494ef16 | 538 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
d6a210b8 | 539 | */ |
7494ef16 BJ |
540 | ilock(ip) |
541 | register struct inode *ip; | |
d6a210b8 BJ |
542 | { |
543 | ||
7494ef16 | 544 | while (ip->i_flag&ILOCK) { |
d6a210b8 BJ |
545 | ip->i_flag |= IWANT; |
546 | sleep((caddr_t)ip, PINOD); | |
547 | } | |
548 | ip->i_flag |= ILOCK; | |
549 | } | |
550 | ||
551 | /* | |
7494ef16 | 552 | * Unlock an inode. If WANT bit is on, wakeup. |
d6a210b8 | 553 | */ |
ff56f48a | 554 | iunlock(ip) |
7494ef16 | 555 | register struct inode *ip; |
d6a210b8 BJ |
556 | { |
557 | ||
558 | ip->i_flag &= ~ILOCK; | |
7494ef16 | 559 | if (ip->i_flag&IWANT) { |
d6a210b8 BJ |
560 | ip->i_flag &= ~IWANT; |
561 | wakeup((caddr_t)ip); | |
562 | } | |
563 | } |