Commit | Line | Data |
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964bcfb1 | 1 | /* lfs_inode.c 4.4 81/03/09 */ |
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) | |
44 | dev_t dev; | |
45 | ino_t ino; | |
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) | |
73 | dev_t dev; | |
74 | ino_t ino; | |
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]) { | |
86 | if(ino == ip->i_number && dev == ip->i_dev) { | |
87 | if((ip->i_flag&ILOCK) != 0) { | |
88 | ip->i_flag |= IWANT; | |
89 | sleep((caddr_t)ip, PINOD); | |
90 | goto loop; | |
91 | } | |
92 | if((ip->i_flag&IMOUNT) != 0) { | |
93 | for(mp = &mount[0]; mp < &mount[NMOUNT]; mp++) | |
94 | if(mp->m_inodp == ip) { | |
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 | } | |
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 | */ | |
125 | if((bp->b_flags&B_ERROR) != 0) { | |
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) | |
138 | register struct inode *ip; | |
139 | register struct dinode *dp; | |
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) | |
167 | register struct inode *ip; | |
168 | { | |
169 | register int i, x; | |
170 | register struct inode *jp; | |
171 | ||
172 | if(ip->i_count == 1) { | |
173 | ip->i_flag |= ILOCK; | |
174 | if(ip->i_nlink <= 0) { | |
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); |
5d5124a1 BJ |
181 | prele(ip); |
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 | |
201 | prele(ip); | |
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) |
5d5124a1 BJ |
214 | register struct inode *ip; |
215 | time_t *ta, *tm; | |
c0bb1685 | 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 | ||
223 | if((ip->i_flag&(IUPD|IACC|ICHG)) != 0) { | |
224 | if(getfs(ip->i_dev)->s_ronly) | |
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++; | |
244 | if(*p2++ != 0 && (ip->i_mode&IFMT)!=IFMPC | |
245 | && (ip->i_mode&IFMT)!=IFMPB) | |
246 | printf("iaddress > 2^24\n"); | |
247 | } | |
248 | if(ip->i_flag&IACC) | |
249 | dp->di_atime = *ta; | |
250 | if(ip->i_flag&IUPD) | |
251 | dp->di_mtime = *tm; | |
252 | if(ip->i_flag&ICHG) | |
253 | dp->di_ctime = time; | |
254 | ip->i_flag &= ~(IUPD|IACC|ICHG); | |
c0bb1685 BJ |
255 | if (waitfor) |
256 | bwrite(bp); | |
257 | else | |
258 | bdwrite(bp); | |
5d5124a1 BJ |
259 | } |
260 | } | |
261 | ||
262 | /* | |
263 | * Free all the disk blocks associated | |
264 | * with the specified inode structure. | |
265 | * The blocks of the file are removed | |
266 | * in reverse order. This FILO | |
267 | * algorithm will tend to maintain | |
268 | * a contiguous free list much longer | |
269 | * than FIFO. | |
270 | */ | |
271 | itrunc(ip) | |
272 | register struct inode *ip; | |
273 | { | |
274 | register i; | |
275 | dev_t dev; | |
276 | daddr_t bn; | |
c0bb1685 | 277 | struct inode itmp; |
5d5124a1 BJ |
278 | |
279 | if (ip->i_vfdcnt) | |
280 | panic("itrunc"); | |
281 | i = ip->i_mode & IFMT; | |
282 | if (i!=IFREG && i!=IFDIR) | |
283 | return; | |
c0bb1685 BJ |
284 | |
285 | /* | |
286 | * Clean inode on disk before freeing blocks | |
287 | * to insure no duplicates if system crashes. | |
288 | */ | |
289 | itmp = *ip; | |
290 | itmp.i_size = 0; | |
291 | for (i = 0; i < NADDR; i++) | |
292 | itmp.i_un.i_addr[i] = 0; | |
293 | itmp.i_flag |= ICHG|IUPD; | |
294 | iupdat(&itmp, &time, &time, 1); | |
295 | ip->i_flag &= ~(IUPD|IACC|ICHG); | |
296 | ||
297 | /* | |
298 | * Now return blocks to free list... if machine | |
299 | * crashes, they will be harmless MISSING blocks. | |
300 | */ | |
5d5124a1 BJ |
301 | dev = ip->i_dev; |
302 | for(i=NADDR-1; i>=0; i--) { | |
303 | bn = ip->i_un.i_addr[i]; | |
304 | if(bn == (daddr_t)0) | |
305 | continue; | |
306 | ip->i_un.i_addr[i] = (daddr_t)0; | |
307 | switch(i) { | |
308 | ||
309 | default: | |
310 | free(dev, bn); | |
311 | break; | |
312 | ||
313 | case NADDR-3: | |
314 | tloop(dev, bn, 0, 0); | |
315 | break; | |
316 | ||
317 | case NADDR-2: | |
318 | tloop(dev, bn, 1, 0); | |
319 | break; | |
320 | ||
321 | case NADDR-1: | |
322 | tloop(dev, bn, 1, 1); | |
323 | } | |
324 | } | |
325 | ip->i_size = 0; | |
c0bb1685 BJ |
326 | /* |
327 | * Inode was written and flags updated above. | |
328 | * No need to modify flags here. | |
329 | */ | |
5d5124a1 BJ |
330 | } |
331 | ||
332 | tloop(dev, bn, f1, f2) | |
333 | dev_t dev; | |
334 | daddr_t bn; | |
335 | { | |
336 | register i; | |
337 | register struct buf *bp; | |
338 | register daddr_t *bap; | |
339 | daddr_t nb; | |
340 | ||
341 | bp = NULL; | |
342 | for(i=NINDIR-1; i>=0; i--) { | |
343 | if(bp == NULL) { | |
344 | bp = bread(dev, bn); | |
345 | if (bp->b_flags & B_ERROR) { | |
346 | brelse(bp); | |
347 | return; | |
348 | } | |
349 | bap = bp->b_un.b_daddr; | |
350 | } | |
351 | nb = bap[i]; | |
352 | if(nb == (daddr_t)0) | |
353 | continue; | |
354 | if(f1) { | |
355 | brelse(bp); | |
356 | bp = NULL; | |
357 | tloop(dev, nb, f2, 0); | |
358 | } else | |
359 | free(dev, nb); | |
360 | } | |
361 | if(bp != NULL) | |
362 | brelse(bp); | |
363 | free(dev, bn); | |
364 | } | |
365 | ||
366 | /* | |
367 | * Make a new file. | |
368 | */ | |
369 | struct inode * | |
370 | maknode(mode) | |
371 | { | |
372 | register struct inode *ip; | |
373 | ||
374 | ip = ialloc(u.u_pdir->i_dev); | |
375 | if(ip == NULL) { | |
376 | iput(u.u_pdir); | |
377 | return(NULL); | |
378 | } | |
379 | ip->i_flag |= IACC|IUPD|ICHG; | |
380 | if((mode&IFMT) == 0) | |
381 | mode |= IFREG; | |
382 | ip->i_mode = mode & ~u.u_cmask; | |
383 | ip->i_nlink = 1; | |
384 | ip->i_uid = u.u_uid; | |
385 | ip->i_gid = u.u_gid; | |
c0bb1685 BJ |
386 | |
387 | /* | |
388 | * Make sure inode goes to disk before directory entry. | |
389 | */ | |
390 | iupdat(ip, &time, &time, 1); | |
391 | ||
5d5124a1 BJ |
392 | wdir(ip); |
393 | return(ip); | |
394 | } | |
395 | ||
396 | /* | |
397 | * Write a directory entry with | |
398 | * parameters left as side effects | |
399 | * to a call to namei. | |
400 | */ | |
401 | wdir(ip) | |
402 | struct inode *ip; | |
403 | { | |
404 | ||
405 | u.u_dent.d_ino = ip->i_number; | |
406 | bcopy((caddr_t)u.u_dbuf, (caddr_t)u.u_dent.d_name, DIRSIZ); | |
407 | u.u_count = sizeof(struct direct); | |
408 | u.u_segflg = 1; | |
409 | u.u_base = (caddr_t)&u.u_dent; | |
410 | writei(u.u_pdir); | |
411 | iput(u.u_pdir); | |
412 | } |