Commit | Line | Data |
---|---|---|
b11be056 | 1 | /* lfs_inode.c 6.1 83/07/29 */ |
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" | |
b4567e9c | 12 | #ifdef QUOTA |
4147b3f6 BJ |
13 | #include "../h/quota.h" |
14 | #endif | |
3e63ef5b | 15 | #include "../h/kernel.h" |
5d5124a1 BJ |
16 | |
17 | #define INOHSZ 63 | |
3ebac878 RE |
18 | #if ((INOHSZ&(INOHSZ-1)) == 0) |
19 | #define INOHASH(dev,ino) (((dev)+(ino))&(INOHSZ-1)) | |
20 | #else | |
a3a9487d | 21 | #define INOHASH(dev,ino) (((unsigned)((dev)+(ino)))%INOHSZ) |
3ebac878 RE |
22 | #endif |
23 | ||
24 | union ihead { /* inode LRU cache, Chris Maltby */ | |
25 | union ihead *ih_head[2]; | |
26 | struct inode *ih_chain[2]; | |
27 | } ihead[INOHSZ]; | |
28 | ||
29 | struct inode *ifreeh, **ifreet; | |
5d5124a1 BJ |
30 | |
31 | /* | |
32 | * Initialize hash links for inodes | |
33 | * and build inode free list. | |
34 | */ | |
35 | ihinit() | |
36 | { | |
37 | register int i; | |
75105cf0 | 38 | register struct inode *ip = inode; |
3ebac878 | 39 | register union ihead *ih = ihead; |
5d5124a1 | 40 | |
3ebac878 RE |
41 | for (i = INOHSZ; --i >= 0; ih++) { |
42 | ih->ih_head[0] = ih; | |
43 | ih->ih_head[1] = ih; | |
44 | } | |
45 | ifreeh = ip; | |
46 | ifreet = &ip->i_freef; | |
47 | ip->i_freeb = &ifreeh; | |
48 | ip->i_forw = ip; | |
49 | ip->i_back = ip; | |
50 | for (i = ninode; --i > 0; ) { | |
51 | ++ip; | |
52 | ip->i_forw = ip; | |
53 | ip->i_back = ip; | |
54 | *ifreet = ip; | |
55 | ip->i_freeb = ifreet; | |
56 | ifreet = &ip->i_freef; | |
57 | } | |
58 | ip->i_freef = NULL; | |
5d5124a1 BJ |
59 | } |
60 | ||
3ebac878 RE |
61 | #ifdef notdef |
62 | /* | |
63 | * Find an inode if it is incore. | |
64 | * This is the equivalent, for inodes, | |
65 | * of ``incore'' in bio.c or ``pfind'' in subr.c. | |
66 | */ | |
67 | struct inode * | |
68 | ifind(dev, ino) | |
69 | dev_t dev; | |
70 | ino_t ino; | |
71 | { | |
72 | register struct inode *ip; | |
73 | register union ihead *ih; | |
74 | ||
75 | ih = &ihead[INOHASH(dev, ino)]; | |
76 | for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw) | |
77 | if (ino==ip->i_number && dev==ip->i_dev) | |
78 | return (ip); | |
79 | return ((struct inode *)0); | |
80 | } | |
81 | #endif notdef | |
82 | ||
5d5124a1 BJ |
83 | /* |
84 | * Look up an inode by device,inumber. | |
85 | * If it is in core (in the inode structure), | |
86 | * honor the locking protocol. | |
87 | * If it is not in core, read it in from the | |
88 | * specified device. | |
89 | * If the inode is mounted on, perform | |
90 | * the indicated indirection. | |
91 | * In all cases, a pointer to a locked | |
92 | * inode structure is returned. | |
93 | * | |
5d5124a1 BJ |
94 | * panic: no imt -- if the mounted file |
95 | * system is not in the mount table. | |
96 | * "cannot happen" | |
97 | */ | |
98 | struct inode * | |
6459ebe0 | 99 | iget(dev, fs, ino) |
7494ef16 | 100 | dev_t dev; |
6459ebe0 | 101 | register struct fs *fs; |
7494ef16 | 102 | ino_t ino; |
5d5124a1 | 103 | { |
32dc2b7e RE |
104 | register struct inode *ip; |
105 | register union ihead *ih; | |
5d5124a1 BJ |
106 | register struct mount *mp; |
107 | register struct buf *bp; | |
108 | register struct dinode *dp; | |
3ebac878 | 109 | register struct inode *iq; |
5d5124a1 BJ |
110 | |
111 | loop: | |
6459ebe0 KM |
112 | if (getfs(dev) != fs) |
113 | panic("iget: bad fs"); | |
3ebac878 RE |
114 | ih = &ihead[INOHASH(dev, ino)]; |
115 | for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw) | |
7494ef16 | 116 | if (ino == ip->i_number && dev == ip->i_dev) { |
5c2ba954 | 117 | if ((ip->i_flag&ILOCKED) != 0) { |
5d5124a1 BJ |
118 | ip->i_flag |= IWANT; |
119 | sleep((caddr_t)ip, PINOD); | |
120 | goto loop; | |
121 | } | |
7494ef16 | 122 | if ((ip->i_flag&IMOUNT) != 0) { |
6459ebe0 | 123 | for (mp = &mount[0]; mp < &mount[NMOUNT]; mp++) |
3ebac878 RE |
124 | if(mp->m_inodp == ip) { |
125 | dev = mp->m_dev; | |
126 | fs = mp->m_bufp->b_un.b_fs; | |
127 | ino = ROOTINO; | |
128 | goto loop; | |
129 | } | |
5d5124a1 BJ |
130 | panic("no imt"); |
131 | } | |
3ebac878 RE |
132 | if (ip->i_count == 0) { /* ino on free list */ |
133 | if (iq = ip->i_freef) | |
134 | iq->i_freeb = ip->i_freeb; | |
135 | else | |
136 | ifreet = ip->i_freeb; | |
137 | *ip->i_freeb = iq; | |
138 | ip->i_freef = NULL; | |
139 | ip->i_freeb = NULL; | |
140 | } | |
5d5124a1 | 141 | ip->i_count++; |
5c2ba954 | 142 | ip->i_flag |= ILOCKED; |
5d5124a1 BJ |
143 | return(ip); |
144 | } | |
3ebac878 RE |
145 | |
146 | if ((ip = ifreeh) == NULL) { | |
945fbb1b | 147 | tablefull("inode"); |
5d5124a1 BJ |
148 | u.u_error = ENFILE; |
149 | return(NULL); | |
150 | } | |
3ebac878 RE |
151 | if (iq = ip->i_freef) |
152 | iq->i_freeb = &ifreeh; | |
153 | ifreeh = iq; | |
154 | ip->i_freef = NULL; | |
155 | ip->i_freeb = NULL; | |
156 | /* | |
157 | * Now to take inode off the hash chain it was on | |
158 | * (initially, or after an iflush, it is on a "hash chain" | |
159 | * consisting entirely of itself, and pointed to by no-one, | |
160 | * but that doesn't matter), and put it on the chain for | |
161 | * its new (ino, dev) pair | |
162 | */ | |
32dc2b7e RE |
163 | remque(ip); |
164 | insque(ip, ih); | |
b4567e9c | 165 | #ifdef QUOTA |
89045c38 RE |
166 | dqrele(ip->i_dquot); |
167 | #endif | |
5d5124a1 | 168 | ip->i_dev = dev; |
6459ebe0 | 169 | ip->i_fs = fs; |
5d5124a1 | 170 | ip->i_number = ino; |
5c2ba954 | 171 | ip->i_flag = ILOCKED; |
5d5124a1 | 172 | ip->i_count++; |
6459ebe0 | 173 | ip->i_lastr = 0; |
954ce9b1 | 174 | bp = bread(dev, fsbtodb(fs, itod(fs, ino)), (int)fs->fs_bsize); |
5d5124a1 BJ |
175 | /* |
176 | * Check I/O errors | |
177 | */ | |
7494ef16 | 178 | if ((bp->b_flags&B_ERROR) != 0) { |
5d5124a1 | 179 | brelse(bp); |
3ebac878 RE |
180 | /* |
181 | * the inode doesn't contain anything useful, so it would | |
182 | * be misleading to leave it on its hash chain. | |
183 | * 'iput' will take care of putting it back on the free list. | |
184 | */ | |
32dc2b7e | 185 | remque(ip); |
3ebac878 RE |
186 | ip->i_forw = ip; |
187 | ip->i_back = ip; | |
188 | /* | |
189 | * we also loose its inumber, just in case (as iput | |
190 | * doesn't do that any more) - but as it isn't on its | |
191 | * hash chain, I doubt if this is really necessary .. kre | |
192 | * (probably the two methods are interchangable) | |
193 | */ | |
194 | ip->i_number = 0; | |
b4567e9c | 195 | #ifdef QUOTA |
89045c38 RE |
196 | ip->i_dquot = NODQUOT; |
197 | #endif | |
5d5124a1 BJ |
198 | iput(ip); |
199 | return(NULL); | |
200 | } | |
201 | dp = bp->b_un.b_dino; | |
6459ebe0 KM |
202 | dp += itoo(fs, ino); |
203 | ip->i_ic = dp->di_ic; | |
5d5124a1 | 204 | brelse(bp); |
b4567e9c | 205 | #ifdef QUOTA |
89045c38 RE |
206 | if (ip->i_mode == 0) |
207 | ip->i_dquot = NODQUOT; | |
208 | else | |
209 | ip->i_dquot = inoquota(ip); | |
210 | #endif | |
6459ebe0 | 211 | return (ip); |
5d5124a1 BJ |
212 | } |
213 | ||
214 | /* | |
215 | * Decrement reference count of | |
216 | * an inode structure. | |
217 | * On the last reference, | |
218 | * write the inode out and if necessary, | |
219 | * truncate and deallocate the file. | |
220 | */ | |
221 | iput(ip) | |
7494ef16 | 222 | register struct inode *ip; |
5d5124a1 | 223 | { |
ff56f48a | 224 | |
5c2ba954 | 225 | if ((ip->i_flag & ILOCKED) == 0) |
ff56f48a KM |
226 | panic("iput"); |
227 | iunlock(ip); | |
228 | irele(ip); | |
229 | } | |
230 | ||
231 | irele(ip) | |
232 | register struct inode *ip; | |
233 | { | |
6459ebe0 | 234 | int mode; |
5d5124a1 | 235 | |
7494ef16 | 236 | if (ip->i_count == 1) { |
5c2ba954 | 237 | ip->i_flag |= ILOCKED; |
7494ef16 | 238 | if (ip->i_nlink <= 0) { |
4f083fd7 | 239 | itrunc(ip, (u_long)0); |
6459ebe0 | 240 | mode = ip->i_mode; |
5d5124a1 | 241 | ip->i_mode = 0; |
85f9cfb8 | 242 | ip->i_rdev = 0; |
5d5124a1 | 243 | ip->i_flag |= IUPD|ICHG; |
6459ebe0 | 244 | ifree(ip, ip->i_number, mode); |
b4567e9c | 245 | #ifdef QUOTA |
08d9a8ec | 246 | (void) chkiq(ip->i_dev, ip, ip->i_uid, 0); |
89045c38 RE |
247 | dqrele(ip->i_dquot); |
248 | ip->i_dquot = NODQUOT; | |
249 | #endif | |
5d5124a1 | 250 | } |
3fd23f5c | 251 | IUPDAT(ip, &time, &time, 0); |
ff56f48a | 252 | iunlock(ip); |
3ebac878 RE |
253 | ip->i_flag = 0; |
254 | /* | |
255 | * Put the inode on the end of the free list. | |
256 | * Possibly in some cases it would be better to | |
257 | * put the inode at the head of the free list, | |
258 | * (eg: where i_mode == 0 || i_number == 0) | |
259 | * but I will think about that later .. kre | |
260 | * (i_number is rarely 0 - only after an i/o error in iget, | |
261 | * where i_mode == 0, the inode will probably be wanted | |
262 | * again soon for an ialloc, so possibly we should keep it) | |
263 | */ | |
264 | if (ifreeh) { | |
265 | *ifreet = ip; | |
266 | ip->i_freeb = ifreet; | |
5d5124a1 | 267 | } else { |
3ebac878 RE |
268 | ifreeh = ip; |
269 | ip->i_freeb = &ifreeh; | |
5d5124a1 | 270 | } |
3ebac878 RE |
271 | ip->i_freef = NULL; |
272 | ifreet = &ip->i_freef; | |
ff56f48a | 273 | } |
5d5124a1 BJ |
274 | ip->i_count--; |
275 | } | |
276 | ||
277 | /* | |
278 | * Check accessed and update flags on | |
279 | * an inode structure. | |
280 | * If any is on, update the inode | |
281 | * with the current time. | |
c0bb1685 BJ |
282 | * If waitfor is given, then must insure |
283 | * i/o order so wait for write to complete. | |
5d5124a1 | 284 | */ |
c0bb1685 | 285 | iupdat(ip, ta, tm, waitfor) |
7494ef16 | 286 | register struct inode *ip; |
b32450f4 | 287 | struct timeval *ta, *tm; |
7494ef16 | 288 | int waitfor; |
5d5124a1 BJ |
289 | { |
290 | register struct buf *bp; | |
291 | struct dinode *dp; | |
6459ebe0 | 292 | register struct fs *fp; |
5d5124a1 | 293 | |
6459ebe0 KM |
294 | fp = ip->i_fs; |
295 | if ((ip->i_flag & (IUPD|IACC|ICHG)) != 0) { | |
296 | if (fp->fs_ronly) | |
5d5124a1 | 297 | return; |
6459ebe0 | 298 | bp = bread(ip->i_dev, fsbtodb(fp, itod(fp, ip->i_number)), |
954ce9b1 | 299 | (int)fp->fs_bsize); |
5d5124a1 BJ |
300 | if (bp->b_flags & B_ERROR) { |
301 | brelse(bp); | |
302 | return; | |
303 | } | |
7494ef16 | 304 | if (ip->i_flag&IACC) |
b32450f4 | 305 | ip->i_atime = ta->tv_sec; |
7494ef16 | 306 | if (ip->i_flag&IUPD) |
b32450f4 | 307 | ip->i_mtime = tm->tv_sec; |
7494ef16 | 308 | if (ip->i_flag&ICHG) |
3e63ef5b | 309 | ip->i_ctime = time.tv_sec; |
5d5124a1 | 310 | ip->i_flag &= ~(IUPD|IACC|ICHG); |
c39ea692 RE |
311 | dp = bp->b_un.b_dino + itoo(fp, ip->i_number); |
312 | dp->di_ic = ip->i_ic; | |
c0bb1685 BJ |
313 | if (waitfor) |
314 | bwrite(bp); | |
315 | else | |
316 | bdwrite(bp); | |
5d5124a1 BJ |
317 | } |
318 | } | |
319 | ||
9c03b2c0 SL |
320 | #define SINGLE 0 /* index of single indirect block */ |
321 | #define DOUBLE 1 /* index of double indirect block */ | |
322 | #define TRIPLE 2 /* index of triple indirect block */ | |
5d5124a1 | 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. | |
9c03b2c0 SL |
328 | * |
329 | * NB: triple indirect blocks are untested. | |
5d5124a1 | 330 | */ |
9c03b2c0 SL |
331 | itrunc(oip, length) |
332 | struct inode *oip; | |
4f083fd7 | 333 | u_long length; |
5d5124a1 BJ |
334 | { |
335 | register i; | |
4f083fd7 | 336 | register daddr_t lastblock; |
9c03b2c0 | 337 | daddr_t bn, lastiblock[NIADDR]; |
6459ebe0 | 338 | register struct fs *fs; |
9c03b2c0 SL |
339 | register struct inode *ip; |
340 | struct inode tip; | |
4f083fd7 SL |
341 | long blocksreleased = 0, nblocks; |
342 | long indirtrunc(); | |
08d9a8ec | 343 | int level; |
4f083fd7 | 344 | |
7b2e4f05 SL |
345 | if (oip->i_size <= length) { |
346 | oip->i_flag |= ICHG|IUPD; | |
347 | iupdat(oip, &time, &time, 1); | |
4f083fd7 | 348 | return; |
7b2e4f05 | 349 | } |
c0bb1685 | 350 | /* |
9c03b2c0 SL |
351 | * Calculate index into inode's block list of |
352 | * last direct and indirect blocks (if any) | |
353 | * which we want to keep. Lastblock is -1 when | |
354 | * the file is truncated to 0. | |
c0bb1685 | 355 | */ |
9c03b2c0 | 356 | fs = oip->i_fs; |
4f083fd7 | 357 | lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1; |
9c03b2c0 SL |
358 | lastiblock[SINGLE] = lastblock - NDADDR; |
359 | lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); | |
360 | lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); | |
08d9a8ec | 361 | nblocks = btodb(fs->fs_bsize); |
6459ebe0 | 362 | /* |
9c03b2c0 SL |
363 | * Update size of file and block pointers |
364 | * on disk before we start freeing blocks. | |
365 | * If we crash before free'ing blocks below, | |
366 | * the blocks will be returned to the free list. | |
367 | * lastiblock values are also normalized to -1 | |
368 | * for calls to indirtrunc below. | |
369 | * (? fsck doesn't check validity of pointers in indirect blocks) | |
6459ebe0 | 370 | */ |
9c03b2c0 SL |
371 | tip = *oip; |
372 | for (level = TRIPLE; level >= SINGLE; level--) | |
373 | if (lastiblock[level] < 0) { | |
374 | oip->i_ib[level] = 0; | |
375 | lastiblock[level] = -1; | |
4f083fd7 | 376 | } |
9c03b2c0 SL |
377 | for (i = NDADDR - 1; i > lastblock; i--) |
378 | oip->i_db[i] = 0; | |
379 | oip->i_size = length; | |
380 | oip->i_flag |= ICHG|IUPD; | |
381 | iupdat(oip, &time, &time, 1); | |
382 | ip = &tip; | |
383 | ||
6459ebe0 | 384 | /* |
9c03b2c0 | 385 | * Indirect blocks first. |
6459ebe0 | 386 | */ |
9c03b2c0 SL |
387 | for (level = TRIPLE; level >= SINGLE; level--) { |
388 | bn = ip->i_ib[level]; | |
4f083fd7 | 389 | if (bn != 0) { |
9c03b2c0 | 390 | blocksreleased += |
08d9a8ec | 391 | indirtrunc(ip, bn, lastiblock[level], level); |
9c03b2c0 SL |
392 | if (lastiblock[level] < 0) { |
393 | ip->i_ib[level] = 0; | |
394 | free(ip, bn, (off_t)fs->fs_bsize); | |
9c03b2c0 | 395 | blocksreleased += nblocks; |
9c03b2c0 SL |
396 | } |
397 | } | |
398 | if (lastiblock[level] >= 0) | |
399 | goto done; | |
4f083fd7 | 400 | } |
9c03b2c0 | 401 | |
6459ebe0 | 402 | /* |
9c03b2c0 | 403 | * All whole direct blocks or frags. |
6459ebe0 | 404 | */ |
4f083fd7 SL |
405 | for (i = NDADDR - 1; i > lastblock; i--) { |
406 | register int size; | |
407 | ||
6459ebe0 | 408 | bn = ip->i_db[i]; |
4f083fd7 | 409 | if (bn == 0) |
5d5124a1 | 410 | continue; |
4f083fd7 SL |
411 | ip->i_db[i] = 0; |
412 | size = (off_t)blksize(fs, ip, i); | |
413 | free(ip, bn, size); | |
08d9a8ec | 414 | blocksreleased += btodb(size); |
4f083fd7 | 415 | } |
9c03b2c0 SL |
416 | if (lastblock < 0) |
417 | goto done; | |
418 | ||
4f083fd7 SL |
419 | /* |
420 | * Finally, look for a change in size of the | |
421 | * last direct block; release any frags. | |
422 | */ | |
9c03b2c0 SL |
423 | bn = ip->i_db[lastblock]; |
424 | if (bn != 0) { | |
425 | int oldspace, newspace; | |
426 | ||
4f083fd7 SL |
427 | /* |
428 | * Calculate amount of space we're giving | |
429 | * back as old block size minus new block size. | |
430 | */ | |
9c03b2c0 | 431 | oldspace = blksize(fs, ip, lastblock); |
4f083fd7 | 432 | ip->i_size = length; |
9c03b2c0 SL |
433 | newspace = blksize(fs, ip, lastblock); |
434 | if (newspace == 0) | |
435 | panic("itrunc: newspace"); | |
436 | if (oldspace - newspace > 0) { | |
4f083fd7 SL |
437 | /* |
438 | * Block number of space to be free'd is | |
439 | * the old block # plus the number of frags | |
440 | * required for the storage we're keeping. | |
441 | */ | |
9c03b2c0 SL |
442 | bn += numfrags(fs, newspace); |
443 | free(ip, bn, oldspace - newspace); | |
08d9a8ec | 444 | blocksreleased += btodb(oldspace - newspace); |
4f083fd7 | 445 | } |
5d5124a1 | 446 | } |
4f083fd7 | 447 | done: |
9c03b2c0 SL |
448 | /* BEGIN PARANOIA */ |
449 | for (level = SINGLE; level <= TRIPLE; level++) | |
450 | if (ip->i_ib[level] != oip->i_ib[level]) | |
451 | panic("itrunc1"); | |
452 | for (i = 0; i < NDADDR; i++) | |
453 | if (ip->i_db[i] != oip->i_db[i]) | |
454 | panic("itrunc2"); | |
455 | /* END PARANOIA */ | |
08d9a8ec SL |
456 | oip->i_blocks -= blocksreleased; |
457 | if (oip->i_blocks < 0) /* sanity */ | |
458 | oip->i_blocks = 0; | |
459 | oip->i_flag |= ICHG; | |
b4567e9c | 460 | #ifdef QUOTA |
08d9a8ec | 461 | (void) chkdq(oip, -blocksreleased, 0); |
89045c38 | 462 | #endif |
5d5124a1 BJ |
463 | } |
464 | ||
4f083fd7 SL |
465 | /* |
466 | * Release blocks associated with the inode ip and | |
467 | * stored in the indirect block bn. Blocks are free'd | |
468 | * in LIFO order up to (but not including) lastbn. If | |
9c03b2c0 SL |
469 | * level is greater than SINGLE, the block is an indirect |
470 | * block and recursive calls to indirtrunc must be used to | |
471 | * cleanse other indirect blocks. | |
472 | * | |
473 | * NB: triple indirect blocks are untested. | |
4f083fd7 | 474 | */ |
89045c38 | 475 | long |
9c03b2c0 | 476 | indirtrunc(ip, bn, lastbn, level) |
6459ebe0 | 477 | register struct inode *ip; |
4f083fd7 | 478 | daddr_t bn, lastbn; |
9c03b2c0 | 479 | int level; |
5d5124a1 | 480 | { |
4f083fd7 | 481 | register int i; |
9c03b2c0 | 482 | struct buf *bp, *copy; |
5d5124a1 | 483 | register daddr_t *bap; |
9c03b2c0 | 484 | register struct fs *fs = ip->i_fs; |
4f083fd7 | 485 | daddr_t nb, last; |
9c03b2c0 | 486 | long factor; |
4f083fd7 | 487 | int blocksreleased = 0, nblocks; |
5d5124a1 | 488 | |
9c03b2c0 SL |
489 | /* |
490 | * Calculate index in current block of last | |
491 | * block to be kept. -1 indicates the entire | |
492 | * block so we need not calculate the index. | |
493 | */ | |
494 | factor = 1; | |
495 | for (i = SINGLE; i < level; i++) | |
496 | factor *= NINDIR(fs); | |
4f083fd7 | 497 | last = lastbn; |
9c03b2c0 SL |
498 | if (lastbn > 0) |
499 | last /= factor; | |
08d9a8ec | 500 | nblocks = btodb(fs->fs_bsize); |
9c03b2c0 SL |
501 | /* |
502 | * Get buffer of block pointers, zero those | |
503 | * entries corresponding to blocks to be free'd, | |
504 | * and update on disk copy first. | |
505 | */ | |
506 | copy = geteblk((int)fs->fs_bsize); | |
507 | bp = bread(ip->i_dev, fsbtodb(fs, bn), (int)fs->fs_bsize); | |
508 | if (bp->b_flags&B_ERROR) { | |
509 | brelse(copy); | |
510 | brelse(bp); | |
9c03b2c0 | 511 | return (0); |
9c03b2c0 SL |
512 | } |
513 | bap = bp->b_un.b_daddr; | |
514 | bcopy((caddr_t)bap, (caddr_t)copy->b_un.b_daddr, (u_int)fs->fs_bsize); | |
515 | bzero((caddr_t)&bap[last + 1], | |
516 | (u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t)); | |
517 | bwrite(bp); | |
518 | bp = copy, bap = bp->b_un.b_daddr; | |
4f083fd7 | 519 | |
9c03b2c0 SL |
520 | /* |
521 | * Recursively free totally unused blocks. | |
522 | */ | |
523 | for (i = NINDIR(fs) - 1; i > last; i--) { | |
5d5124a1 | 524 | nb = bap[i]; |
4f083fd7 | 525 | if (nb == 0) |
5d5124a1 | 526 | continue; |
9c03b2c0 | 527 | if (level > SINGLE) |
4f083fd7 | 528 | blocksreleased += |
08d9a8ec | 529 | indirtrunc(ip, nb, (daddr_t)-1, level - 1); |
4f083fd7 | 530 | free(ip, nb, (int)fs->fs_bsize); |
4f083fd7 | 531 | blocksreleased += nblocks; |
4f083fd7 | 532 | } |
9c03b2c0 SL |
533 | |
534 | /* | |
535 | * Recursively free last partial block. | |
536 | */ | |
537 | if (level > SINGLE && lastbn >= 0) { | |
538 | last = lastbn % factor; | |
4f083fd7 SL |
539 | nb = bap[i]; |
540 | if (nb != 0) | |
08d9a8ec | 541 | blocksreleased += indirtrunc(ip, nb, last, level - 1); |
5d5124a1 | 542 | } |
9c03b2c0 | 543 | brelse(bp); |
4f083fd7 | 544 | return (blocksreleased); |
5d5124a1 BJ |
545 | } |
546 | ||
3ebac878 RE |
547 | /* |
548 | * remove any inodes in the inode cache belonging to dev | |
549 | * | |
550 | * There should not be any active ones, return error if any are found | |
551 | * (nb: this is a user error, not a system err) | |
552 | * | |
553 | * Also, count the references to dev by block devices - this really | |
554 | * has nothing to do with the object of the procedure, but as we have | |
555 | * to scan the inode table here anyway, we might as well get the | |
556 | * extra benefit. | |
557 | * | |
558 | * this is called from sumount()/sys3.c when dev is being unmounted | |
559 | */ | |
b4567e9c | 560 | #ifdef QUOTA |
4147b3f6 | 561 | iflush(dev, iq) |
89045c38 | 562 | dev_t dev; |
4147b3f6 | 563 | struct inode *iq; |
89045c38 | 564 | #else |
3ebac878 RE |
565 | iflush(dev) |
566 | dev_t dev; | |
89045c38 | 567 | #endif |
3ebac878 | 568 | { |
32dc2b7e | 569 | register struct inode *ip; |
3ebac878 RE |
570 | register open = 0; |
571 | ||
572 | for (ip = inode; ip < inodeNINODE; ip++) { | |
b4567e9c | 573 | #ifdef QUOTA |
89045c38 RE |
574 | if (ip != iq && ip->i_dev == dev) |
575 | #else | |
3ebac878 | 576 | if (ip->i_dev == dev) |
89045c38 | 577 | #endif |
3ebac878 RE |
578 | if (ip->i_count) |
579 | return(-1); | |
580 | else { | |
32dc2b7e | 581 | remque(ip); |
3ebac878 RE |
582 | ip->i_forw = ip; |
583 | ip->i_back = ip; | |
584 | /* | |
585 | * as i_count == 0, the inode was on the free | |
586 | * list already, just leave it there, it will | |
587 | * fall off the bottom eventually. We could | |
588 | * perhaps move it to the head of the free | |
589 | * list, but as umounts are done so | |
590 | * infrequently, we would gain very little, | |
591 | * while making the code bigger. | |
592 | */ | |
b4567e9c | 593 | #ifdef QUOTA |
89045c38 RE |
594 | dqrele(ip->i_dquot); |
595 | ip->i_dquot = NODQUOT; | |
596 | #endif | |
3ebac878 RE |
597 | } |
598 | else if (ip->i_count && (ip->i_mode&IFMT)==IFBLK && | |
599 | ip->i_rdev == dev) | |
600 | open++; | |
601 | } | |
602 | return (open); | |
603 | } | |
604 | ||
d6a210b8 | 605 | /* |
7494ef16 | 606 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
d6a210b8 | 607 | */ |
7494ef16 BJ |
608 | ilock(ip) |
609 | register struct inode *ip; | |
d6a210b8 BJ |
610 | { |
611 | ||
5c2ba954 | 612 | ILOCK(ip); |
d6a210b8 BJ |
613 | } |
614 | ||
615 | /* | |
7494ef16 | 616 | * Unlock an inode. If WANT bit is on, wakeup. |
d6a210b8 | 617 | */ |
ff56f48a | 618 | iunlock(ip) |
7494ef16 | 619 | register struct inode *ip; |
d6a210b8 BJ |
620 | { |
621 | ||
5c2ba954 | 622 | IUNLOCK(ip); |
d6a210b8 | 623 | } |