Commit | Line | Data |
---|---|---|
da7c5cc6 | 1 | /* |
7188ac27 KM |
2 | * Copyright (c) 1982, 1986, 1989 Regents of the University of California. |
3 | * All rights reserved. | |
da7c5cc6 | 4 | * |
b702c21d | 5 | * %sccs.include.redist.c% |
7188ac27 | 6 | * |
28708b72 | 7 | * @(#)ffs_inode.c 7.39 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
5d5124a1 | 9 | |
94368568 JB |
10 | #include "param.h" |
11 | #include "systm.h" | |
12 | #include "mount.h" | |
71c4cb8d | 13 | #include "proc.h" |
7188ac27 | 14 | #include "file.h" |
94368568 | 15 | #include "buf.h" |
7188ac27 | 16 | #include "vnode.h" |
94368568 | 17 | #include "kernel.h" |
b30358ab | 18 | #include "malloc.h" |
5d5124a1 | 19 | |
c6f5111d MK |
20 | #include "quota.h" |
21 | #include "inode.h" | |
22 | #include "fs.h" | |
23 | #include "ufsmount.h" | |
24 | ||
c22c66ff | 25 | #define INOHSZ 512 |
3ebac878 RE |
26 | #if ((INOHSZ&(INOHSZ-1)) == 0) |
27 | #define INOHASH(dev,ino) (((dev)+(ino))&(INOHSZ-1)) | |
28 | #else | |
a3a9487d | 29 | #define INOHASH(dev,ino) (((unsigned)((dev)+(ino)))%INOHSZ) |
3ebac878 RE |
30 | #endif |
31 | ||
a1e9dd57 | 32 | union ihead { |
3ebac878 RE |
33 | union ihead *ih_head[2]; |
34 | struct inode *ih_chain[2]; | |
35 | } ihead[INOHSZ]; | |
36 | ||
2bf2d153 KM |
37 | int prtactive; /* 1 => print out reclaim of active vnodes */ |
38 | ||
5d5124a1 | 39 | /* |
a1e9dd57 | 40 | * Initialize hash links for inodes. |
5d5124a1 | 41 | */ |
1259a9f9 | 42 | ufs_init() |
5d5124a1 BJ |
43 | { |
44 | register int i; | |
a1e9dd57 | 45 | register union ihead *ih = ihead; |
5d5124a1 | 46 | |
ff4fb102 | 47 | #ifndef lint |
a1e9dd57 KM |
48 | if (VN_MAXPRIVATE < sizeof(struct inode)) |
49 | panic("ihinit: too small"); | |
ff4fb102 | 50 | #endif /* not lint */ |
3ebac878 RE |
51 | for (i = INOHSZ; --i >= 0; ih++) { |
52 | ih->ih_head[0] = ih; | |
53 | ih->ih_head[1] = ih; | |
54 | } | |
4b61628b KM |
55 | #ifdef QUOTA |
56 | dqinit(); | |
57 | #endif /* QUOTA */ | |
5d5124a1 BJ |
58 | } |
59 | ||
3ebac878 | 60 | /* |
7188ac27 | 61 | * Look up an vnode/inode by device,inumber. |
5d5124a1 BJ |
62 | * If it is in core (in the inode structure), |
63 | * honor the locking protocol. | |
64 | * If it is not in core, read it in from the | |
65 | * specified device. | |
7188ac27 | 66 | * Callers must check for mount points!! |
5d5124a1 BJ |
67 | * In all cases, a pointer to a locked |
68 | * inode structure is returned. | |
5d5124a1 | 69 | */ |
7188ac27 KM |
70 | iget(xp, ino, ipp) |
71 | struct inode *xp; | |
7494ef16 | 72 | ino_t ino; |
7188ac27 | 73 | struct inode **ipp; |
5d5124a1 | 74 | { |
7188ac27 KM |
75 | dev_t dev = xp->i_dev; |
76 | struct mount *mntp = ITOV(xp)->v_mount; | |
77 | register struct fs *fs = VFSTOUFS(mntp)->um_fs; | |
1259a9f9 | 78 | extern struct vnodeops ufs_vnodeops, spec_inodeops; |
7188ac27 KM |
79 | register struct inode *ip, *iq; |
80 | register struct vnode *vp; | |
1259a9f9 | 81 | struct vnode *nvp; |
7188ac27 | 82 | struct buf *bp; |
1259a9f9 | 83 | struct dinode *dp; |
4b61628b KM |
84 | union ihead *ih; |
85 | int i, error; | |
2e64ab65 | 86 | |
3ebac878 | 87 | ih = &ihead[INOHASH(dev, ino)]; |
1259a9f9 | 88 | loop: |
a1e9dd57 KM |
89 | for (ip = ih->ih_chain[0]; ip != (struct inode *)ih; ip = ip->i_forw) { |
90 | if (ino != ip->i_number || dev != ip->i_dev) | |
91 | continue; | |
a1e9dd57 KM |
92 | if ((ip->i_flag&ILOCKED) != 0) { |
93 | ip->i_flag |= IWANT; | |
94 | sleep((caddr_t)ip, PINOD); | |
95 | goto loop; | |
7188ac27 | 96 | } |
1259a9f9 KM |
97 | if (vget(ITOV(ip))) |
98 | goto loop; | |
a1e9dd57 KM |
99 | *ipp = ip; |
100 | return(0); | |
101 | } | |
1259a9f9 KM |
102 | /* |
103 | * Allocate a new inode. | |
104 | */ | |
105 | if (error = getnewvnode(VT_UFS, mntp, &ufs_vnodeops, &nvp)) { | |
7188ac27 KM |
106 | *ipp = 0; |
107 | return (error); | |
108 | } | |
1259a9f9 KM |
109 | ip = VTOI(nvp); |
110 | ip->i_vnode = nvp; | |
111 | ip->i_flag = 0; | |
112 | ip->i_devvp = 0; | |
1259a9f9 | 113 | ip->i_mode = 0; |
c9ad8afc | 114 | ip->i_diroff = 0; |
4754ee14 | 115 | ip->i_lockf = 0; |
1259a9f9 | 116 | #ifdef QUOTA |
4b61628b KM |
117 | for (i = 0; i < MAXQUOTAS; i++) |
118 | ip->i_dquot[i] = NODQUOT; | |
1259a9f9 KM |
119 | #endif |
120 | /* | |
121 | * Put it onto its hash chain and lock it so that other requests for | |
122 | * this inode will block if they arrive while we are sleeping waiting | |
123 | * for old data structures to be purged or for the contents of the | |
124 | * disk portion of this inode to be read. | |
125 | */ | |
126 | ip->i_dev = dev; | |
127 | ip->i_number = ino; | |
128 | insque(ip, ih); | |
129 | ILOCK(ip); | |
7188ac27 KM |
130 | /* |
131 | * Read in the disk contents for the inode. | |
132 | */ | |
133 | if (error = bread(VFSTOUFS(mntp)->um_devvp, fsbtodb(fs, itod(fs, ino)), | |
a937f856 | 134 | (int)fs->fs_bsize, NOCRED, &bp)) { |
bd4160ab KM |
135 | /* |
136 | * The inode does not contain anything useful, so it would | |
137 | * be misleading to leave it on its hash chain. | |
138 | * Iput() will take care of putting it back on the free list. | |
139 | */ | |
140 | remque(ip); | |
141 | ip->i_forw = ip; | |
142 | ip->i_back = ip; | |
7188ac27 | 143 | /* |
a1e9dd57 | 144 | * Unlock and discard unneeded inode. |
7188ac27 | 145 | */ |
1259a9f9 | 146 | iput(ip); |
7188ac27 KM |
147 | brelse(bp); |
148 | *ipp = 0; | |
1259a9f9 | 149 | return (error); |
7188ac27 | 150 | } |
7188ac27 KM |
151 | dp = bp->b_un.b_dino; |
152 | dp += itoo(fs, ino); | |
1259a9f9 KM |
153 | ip->i_din = *dp; |
154 | brelse(bp); | |
155 | /* | |
156 | * Initialize the associated vnode | |
157 | */ | |
158 | vp = ITOV(ip); | |
159 | vp->v_type = IFTOVT(ip->i_mode); | |
4c7b0b09 KM |
160 | if (vp->v_type == VFIFO) { |
161 | #ifdef FIFO | |
162 | extern struct vnodeops fifo_inodeops; | |
163 | vp->v_op = &fifo_inodeops; | |
164 | #else | |
165 | iput(ip); | |
166 | *ipp = 0; | |
167 | return (EOPNOTSUPP); | |
168 | #endif /* FIFO */ | |
169 | } | |
1259a9f9 | 170 | if (vp->v_type == VCHR || vp->v_type == VBLK) { |
1259a9f9 | 171 | vp->v_op = &spec_inodeops; |
43fc727e | 172 | if (nvp = checkalias(vp, ip->i_rdev, mntp)) { |
7188ac27 | 173 | /* |
1259a9f9 | 174 | * Reinitialize aliased inode. |
7188ac27 | 175 | */ |
1259a9f9 KM |
176 | vp = nvp; |
177 | iq = VTOI(vp); | |
178 | iq->i_vnode = vp; | |
a97f9198 | 179 | iq->i_flag = 0; |
1259a9f9 KM |
180 | ILOCK(iq); |
181 | iq->i_din = ip->i_din; | |
182 | iq->i_dev = dev; | |
183 | iq->i_number = ino; | |
184 | insque(iq, ih); | |
7188ac27 | 185 | /* |
1259a9f9 | 186 | * Discard unneeded vnode |
7188ac27 | 187 | */ |
1259a9f9 KM |
188 | ip->i_mode = 0; |
189 | iput(ip); | |
7188ac27 | 190 | ip = iq; |
5d5124a1 | 191 | } |
7188ac27 | 192 | } |
1259a9f9 KM |
193 | if (ino == ROOTINO) |
194 | vp->v_flag |= VROOT; | |
7188ac27 KM |
195 | /* |
196 | * Finish inode initialization. | |
197 | */ | |
198 | ip->i_fs = fs; | |
199 | ip->i_devvp = VFSTOUFS(mntp)->um_devvp; | |
8fe1c702 | 200 | VREF(ip->i_devvp); |
afd7e202 KM |
201 | /* |
202 | * Set up a generation number for this inode if it does not | |
203 | * already have one. This should only happen on old filesystems. | |
204 | */ | |
205 | if (ip->i_gen == 0) { | |
206 | if (++nextgennumber < (u_long)time.tv_sec) | |
207 | nextgennumber = time.tv_sec; | |
208 | ip->i_gen = nextgennumber; | |
82161bc8 | 209 | if ((vp->v_mount->mnt_flag & MNT_RDONLY) == 0) |
afd7e202 KM |
210 | ip->i_flag |= IMOD; |
211 | } | |
7188ac27 KM |
212 | *ipp = ip; |
213 | return (0); | |
214 | } | |
3ebac878 | 215 | |
5d5124a1 | 216 | /* |
a1e9dd57 | 217 | * Unlock and decrement the reference count of an inode structure. |
5d5124a1 BJ |
218 | */ |
219 | iput(ip) | |
7494ef16 | 220 | register struct inode *ip; |
5d5124a1 | 221 | { |
ff56f48a | 222 | |
5c2ba954 | 223 | if ((ip->i_flag & ILOCKED) == 0) |
ff56f48a | 224 | panic("iput"); |
a388503d | 225 | IUNLOCK(ip); |
7188ac27 | 226 | vrele(ITOV(ip)); |
ff56f48a KM |
227 | } |
228 | ||
a1e9dd57 KM |
229 | /* |
230 | * Last reference to an inode, write the inode out and if necessary, | |
231 | * truncate and deallocate the file. | |
232 | */ | |
28708b72 | 233 | ufs_inactive(vp, p) |
7188ac27 | 234 | struct vnode *vp; |
28708b72 | 235 | struct proc *p; |
ff56f48a | 236 | { |
7188ac27 | 237 | register struct inode *ip = VTOI(vp); |
a1e9dd57 | 238 | int mode, error = 0; |
7188ac27 | 239 | |
0811b508 | 240 | if (prtactive && vp->v_usecount != 0) |
e038406d | 241 | vprint("ufs_inactive: pushing active", vp); |
b5ea418e KM |
242 | /* |
243 | * Get rid of inodes related to stale file handles. | |
244 | */ | |
1259a9f9 | 245 | if (ip->i_mode == 0) { |
e038406d KM |
246 | if ((vp->v_flag & VXLOCK) == 0) |
247 | vgone(vp); | |
1259a9f9 KM |
248 | return (0); |
249 | } | |
aed86454 | 250 | ILOCK(ip); |
82161bc8 | 251 | if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { |
4b61628b KM |
252 | #ifdef QUOTA |
253 | if (!getinoquota(ip)) | |
254 | (void) chkiq(ip, -1, NOCRED, 0); | |
255 | #endif | |
e038406d | 256 | error = itrunc(ip, (u_long)0, 0); |
7188ac27 KM |
257 | mode = ip->i_mode; |
258 | ip->i_mode = 0; | |
e9cacd5b | 259 | ip->i_rdev = 0; |
7188ac27 KM |
260 | ip->i_flag |= IUPD|ICHG; |
261 | ifree(ip, ip->i_number, mode); | |
7188ac27 KM |
262 | } |
263 | IUPDAT(ip, &time, &time, 0); | |
d11dbec7 KM |
264 | IUNLOCK(ip); |
265 | ip->i_flag = 0; | |
7188ac27 | 266 | /* |
a1e9dd57 KM |
267 | * If we are done with the inode, reclaim it |
268 | * so that it can be reused immediately. | |
7188ac27 | 269 | */ |
4b61628b | 270 | if (vp->v_usecount == 0 && ip->i_mode == 0) |
d11dbec7 | 271 | vgone(vp); |
7188ac27 | 272 | return (error); |
5d5124a1 BJ |
273 | } |
274 | ||
275 | /* | |
a1e9dd57 KM |
276 | * Reclaim an inode so that it can be used for other purposes. |
277 | */ | |
278 | ufs_reclaim(vp) | |
279 | register struct vnode *vp; | |
280 | { | |
ff4fb102 | 281 | register struct inode *ip = VTOI(vp); |
4b61628b | 282 | int i; |
a1e9dd57 | 283 | |
0811b508 | 284 | if (prtactive && vp->v_usecount != 0) |
e038406d | 285 | vprint("ufs_reclaim: pushing active", vp); |
a1e9dd57 KM |
286 | /* |
287 | * Remove the inode from its hash chain. | |
288 | */ | |
289 | remque(ip); | |
290 | ip->i_forw = ip; | |
291 | ip->i_back = ip; | |
292 | /* | |
293 | * Purge old data structures associated with the inode. | |
294 | */ | |
295 | cache_purge(vp); | |
296 | if (ip->i_devvp) { | |
297 | vrele(ip->i_devvp); | |
298 | ip->i_devvp = 0; | |
299 | } | |
300 | #ifdef QUOTA | |
4b61628b KM |
301 | for (i = 0; i < MAXQUOTAS; i++) { |
302 | if (ip->i_dquot[i] != NODQUOT) { | |
303 | dqrele(vp, ip->i_dquot[i]); | |
304 | ip->i_dquot[i] = NODQUOT; | |
305 | } | |
306 | } | |
a1e9dd57 | 307 | #endif |
a1e9dd57 KM |
308 | ip->i_flag = 0; |
309 | return (0); | |
310 | } | |
311 | ||
312 | /* | |
313 | * Check accessed and update flags on an inode structure. | |
314 | * If any is on, update the inode with the current time. | |
315 | * If waitfor is given, then must ensure I/O order, | |
316 | * so wait for write to complete. | |
5d5124a1 | 317 | */ |
c0bb1685 | 318 | iupdat(ip, ta, tm, waitfor) |
7494ef16 | 319 | register struct inode *ip; |
b32450f4 | 320 | struct timeval *ta, *tm; |
7494ef16 | 321 | int waitfor; |
5d5124a1 | 322 | { |
7188ac27 KM |
323 | struct buf *bp; |
324 | struct vnode *vp = ITOV(ip); | |
5d5124a1 | 325 | struct dinode *dp; |
ec67a3ce | 326 | register struct fs *fs; |
5d5124a1 | 327 | |
ec67a3ce | 328 | fs = ip->i_fs; |
7188ac27 KM |
329 | if ((ip->i_flag & (IUPD|IACC|ICHG|IMOD)) == 0) |
330 | return (0); | |
82161bc8 | 331 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
7188ac27 KM |
332 | return (0); |
333 | error = bread(ip->i_devvp, fsbtodb(fs, itod(fs, ip->i_number)), | |
a937f856 | 334 | (int)fs->fs_bsize, NOCRED, &bp); |
7188ac27 KM |
335 | if (error) { |
336 | brelse(bp); | |
337 | return (error); | |
338 | } | |
339 | if (ip->i_flag&IACC) | |
340 | ip->i_atime = ta->tv_sec; | |
341 | if (ip->i_flag&IUPD) | |
342 | ip->i_mtime = tm->tv_sec; | |
343 | if (ip->i_flag&ICHG) | |
344 | ip->i_ctime = time.tv_sec; | |
345 | ip->i_flag &= ~(IUPD|IACC|ICHG|IMOD); | |
346 | dp = bp->b_un.b_dino + itoo(fs, ip->i_number); | |
a1e9dd57 | 347 | *dp = ip->i_din; |
7188ac27 KM |
348 | if (waitfor) { |
349 | return (bwrite(bp)); | |
350 | } else { | |
351 | bdwrite(bp); | |
352 | return (0); | |
5d5124a1 BJ |
353 | } |
354 | } | |
355 | ||
9c03b2c0 SL |
356 | #define SINGLE 0 /* index of single indirect block */ |
357 | #define DOUBLE 1 /* index of double indirect block */ | |
358 | #define TRIPLE 2 /* index of triple indirect block */ | |
5d5124a1 | 359 | /* |
a1e9dd57 KM |
360 | * Truncate the inode ip to at most length size. Free affected disk |
361 | * blocks -- the blocks of the file are removed in reverse order. | |
9c03b2c0 SL |
362 | * |
363 | * NB: triple indirect blocks are untested. | |
5d5124a1 | 364 | */ |
e038406d | 365 | itrunc(oip, length, flags) |
28821bc5 | 366 | register struct inode *oip; |
4f083fd7 | 367 | u_long length; |
e038406d | 368 | int flags; |
5d5124a1 | 369 | { |
4f083fd7 | 370 | register daddr_t lastblock; |
a5e62f37 | 371 | daddr_t bn, lbn, lastiblock[NIADDR]; |
6459ebe0 | 372 | register struct fs *fs; |
9c03b2c0 | 373 | register struct inode *ip; |
28821bc5 | 374 | struct buf *bp; |
7188ac27 KM |
375 | int offset, osize, size, level; |
376 | long count, nblocks, blocksreleased = 0; | |
28821bc5 | 377 | register int i; |
e038406d | 378 | int aflags, error, allerror; |
9c03b2c0 | 379 | struct inode tip; |
4f083fd7 | 380 | |
8986c97c | 381 | vnode_pager_setsize(ITOV(oip), length); |
7b2e4f05 SL |
382 | if (oip->i_size <= length) { |
383 | oip->i_flag |= ICHG|IUPD; | |
7188ac27 KM |
384 | error = iupdat(oip, &time, &time, 1); |
385 | return (error); | |
7b2e4f05 | 386 | } |
c0bb1685 | 387 | /* |
9c03b2c0 SL |
388 | * Calculate index into inode's block list of |
389 | * last direct and indirect blocks (if any) | |
390 | * which we want to keep. Lastblock is -1 when | |
391 | * the file is truncated to 0. | |
c0bb1685 | 392 | */ |
9c03b2c0 | 393 | fs = oip->i_fs; |
4f083fd7 | 394 | lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1; |
9c03b2c0 SL |
395 | lastiblock[SINGLE] = lastblock - NDADDR; |
396 | lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); | |
397 | lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); | |
08d9a8ec | 398 | nblocks = btodb(fs->fs_bsize); |
6459ebe0 | 399 | /* |
28821bc5 KM |
400 | * Update the size of the file. If the file is not being |
401 | * truncated to a block boundry, the contents of the | |
402 | * partial block following the end of the file must be | |
403 | * zero'ed in case it ever become accessable again because | |
404 | * of subsequent file growth. | |
405 | */ | |
406 | osize = oip->i_size; | |
407 | offset = blkoff(fs, length); | |
408 | if (offset == 0) { | |
409 | oip->i_size = length; | |
410 | } else { | |
411 | lbn = lblkno(fs, length); | |
e038406d KM |
412 | aflags = B_CLRBUF; |
413 | if (flags & IO_SYNC) | |
414 | aflags |= B_SYNC; | |
4b61628b KM |
415 | #ifdef QUOTA |
416 | if (error = getinoquota(oip)) | |
417 | return (error); | |
418 | #endif | |
e038406d | 419 | if (error = balloc(oip, lbn, offset, &bp, aflags)) |
7188ac27 | 420 | return (error); |
28821bc5 KM |
421 | oip->i_size = length; |
422 | size = blksize(fs, oip, lbn); | |
8986c97c | 423 | (void) vnode_pager_uncache(ITOV(oip)); |
a5e62f37 | 424 | bzero(bp->b_un.b_addr + offset, (unsigned)(size - offset)); |
9cf42d55 | 425 | allocbuf(bp, size); |
e038406d KM |
426 | if (flags & IO_SYNC) |
427 | bwrite(bp); | |
428 | else | |
429 | bdwrite(bp); | |
28821bc5 KM |
430 | } |
431 | /* | |
432 | * Update file and block pointers | |
9c03b2c0 SL |
433 | * on disk before we start freeing blocks. |
434 | * If we crash before free'ing blocks below, | |
435 | * the blocks will be returned to the free list. | |
436 | * lastiblock values are also normalized to -1 | |
437 | * for calls to indirtrunc below. | |
6459ebe0 | 438 | */ |
9c03b2c0 | 439 | tip = *oip; |
28821bc5 | 440 | tip.i_size = osize; |
9c03b2c0 SL |
441 | for (level = TRIPLE; level >= SINGLE; level--) |
442 | if (lastiblock[level] < 0) { | |
443 | oip->i_ib[level] = 0; | |
444 | lastiblock[level] = -1; | |
4f083fd7 | 445 | } |
9c03b2c0 SL |
446 | for (i = NDADDR - 1; i > lastblock; i--) |
447 | oip->i_db[i] = 0; | |
9c03b2c0 | 448 | oip->i_flag |= ICHG|IUPD; |
e038406d | 449 | vinvalbuf(ITOV(oip), (length > 0)); |
2fc1f182 | 450 | allerror = iupdat(oip, &time, &time, MNT_WAIT); |
9c03b2c0 | 451 | |
6459ebe0 | 452 | /* |
9c03b2c0 | 453 | * Indirect blocks first. |
6459ebe0 | 454 | */ |
28821bc5 | 455 | ip = &tip; |
9c03b2c0 SL |
456 | for (level = TRIPLE; level >= SINGLE; level--) { |
457 | bn = ip->i_ib[level]; | |
4f083fd7 | 458 | if (bn != 0) { |
7188ac27 KM |
459 | error = indirtrunc(ip, bn, lastiblock[level], level, |
460 | &count); | |
461 | if (error) | |
462 | allerror = error; | |
463 | blocksreleased += count; | |
9c03b2c0 SL |
464 | if (lastiblock[level] < 0) { |
465 | ip->i_ib[level] = 0; | |
ced3a252 | 466 | blkfree(ip, bn, (off_t)fs->fs_bsize); |
9c03b2c0 | 467 | blocksreleased += nblocks; |
9c03b2c0 SL |
468 | } |
469 | } | |
470 | if (lastiblock[level] >= 0) | |
471 | goto done; | |
4f083fd7 | 472 | } |
9c03b2c0 | 473 | |
6459ebe0 | 474 | /* |
9c03b2c0 | 475 | * All whole direct blocks or frags. |
6459ebe0 | 476 | */ |
4f083fd7 | 477 | for (i = NDADDR - 1; i > lastblock; i--) { |
8011f5df | 478 | register off_t bsize; |
4f083fd7 | 479 | |
6459ebe0 | 480 | bn = ip->i_db[i]; |
4f083fd7 | 481 | if (bn == 0) |
5d5124a1 | 482 | continue; |
4f083fd7 | 483 | ip->i_db[i] = 0; |
0b355a6e | 484 | bsize = (off_t)blksize(fs, ip, i); |
ced3a252 | 485 | blkfree(ip, bn, bsize); |
0b355a6e | 486 | blocksreleased += btodb(bsize); |
4f083fd7 | 487 | } |
9c03b2c0 SL |
488 | if (lastblock < 0) |
489 | goto done; | |
490 | ||
4f083fd7 SL |
491 | /* |
492 | * Finally, look for a change in size of the | |
493 | * last direct block; release any frags. | |
494 | */ | |
9c03b2c0 SL |
495 | bn = ip->i_db[lastblock]; |
496 | if (bn != 0) { | |
8011f5df | 497 | off_t oldspace, newspace; |
9c03b2c0 | 498 | |
4f083fd7 SL |
499 | /* |
500 | * Calculate amount of space we're giving | |
501 | * back as old block size minus new block size. | |
502 | */ | |
9c03b2c0 | 503 | oldspace = blksize(fs, ip, lastblock); |
4f083fd7 | 504 | ip->i_size = length; |
9c03b2c0 SL |
505 | newspace = blksize(fs, ip, lastblock); |
506 | if (newspace == 0) | |
507 | panic("itrunc: newspace"); | |
508 | if (oldspace - newspace > 0) { | |
4f083fd7 SL |
509 | /* |
510 | * Block number of space to be free'd is | |
511 | * the old block # plus the number of frags | |
512 | * required for the storage we're keeping. | |
513 | */ | |
9c03b2c0 | 514 | bn += numfrags(fs, newspace); |
ced3a252 | 515 | blkfree(ip, bn, oldspace - newspace); |
08d9a8ec | 516 | blocksreleased += btodb(oldspace - newspace); |
4f083fd7 | 517 | } |
5d5124a1 | 518 | } |
4f083fd7 | 519 | done: |
9c03b2c0 SL |
520 | /* BEGIN PARANOIA */ |
521 | for (level = SINGLE; level <= TRIPLE; level++) | |
522 | if (ip->i_ib[level] != oip->i_ib[level]) | |
523 | panic("itrunc1"); | |
524 | for (i = 0; i < NDADDR; i++) | |
525 | if (ip->i_db[i] != oip->i_db[i]) | |
526 | panic("itrunc2"); | |
527 | /* END PARANOIA */ | |
08d9a8ec SL |
528 | oip->i_blocks -= blocksreleased; |
529 | if (oip->i_blocks < 0) /* sanity */ | |
530 | oip->i_blocks = 0; | |
531 | oip->i_flag |= ICHG; | |
b4567e9c | 532 | #ifdef QUOTA |
4b61628b KM |
533 | if (!getinoquota(oip)) |
534 | (void) chkdq(oip, -blocksreleased, NOCRED, 0); | |
89045c38 | 535 | #endif |
7188ac27 | 536 | return (allerror); |
5d5124a1 BJ |
537 | } |
538 | ||
4f083fd7 SL |
539 | /* |
540 | * Release blocks associated with the inode ip and | |
541 | * stored in the indirect block bn. Blocks are free'd | |
542 | * in LIFO order up to (but not including) lastbn. If | |
9c03b2c0 SL |
543 | * level is greater than SINGLE, the block is an indirect |
544 | * block and recursive calls to indirtrunc must be used to | |
545 | * cleanse other indirect blocks. | |
546 | * | |
547 | * NB: triple indirect blocks are untested. | |
4f083fd7 | 548 | */ |
7188ac27 | 549 | indirtrunc(ip, bn, lastbn, level, countp) |
6459ebe0 | 550 | register struct inode *ip; |
4f083fd7 | 551 | daddr_t bn, lastbn; |
9c03b2c0 | 552 | int level; |
7188ac27 | 553 | long *countp; |
5d5124a1 | 554 | { |
4f083fd7 | 555 | register int i; |
b30358ab | 556 | struct buf *bp; |
9c03b2c0 | 557 | register struct fs *fs = ip->i_fs; |
b30358ab KM |
558 | register daddr_t *bap; |
559 | daddr_t *copy, nb, last; | |
7188ac27 KM |
560 | long blkcount, factor; |
561 | int nblocks, blocksreleased = 0; | |
562 | int error, allerror = 0; | |
5d5124a1 | 563 | |
9c03b2c0 SL |
564 | /* |
565 | * Calculate index in current block of last | |
566 | * block to be kept. -1 indicates the entire | |
567 | * block so we need not calculate the index. | |
568 | */ | |
569 | factor = 1; | |
570 | for (i = SINGLE; i < level; i++) | |
571 | factor *= NINDIR(fs); | |
4f083fd7 | 572 | last = lastbn; |
9c03b2c0 SL |
573 | if (lastbn > 0) |
574 | last /= factor; | |
08d9a8ec | 575 | nblocks = btodb(fs->fs_bsize); |
9c03b2c0 SL |
576 | /* |
577 | * Get buffer of block pointers, zero those | |
578 | * entries corresponding to blocks to be free'd, | |
579 | * and update on disk copy first. | |
580 | */ | |
ec67a3ce MK |
581 | #ifdef SECSIZE |
582 | bp = bread(ip->i_dev, fsbtodb(fs, bn), (int)fs->fs_bsize, | |
583 | fs->fs_dbsize); | |
584 | #else SECSIZE | |
a937f856 KM |
585 | error = bread(ip->i_devvp, fsbtodb(fs, bn), (int)fs->fs_bsize, |
586 | NOCRED, &bp); | |
7188ac27 | 587 | if (error) { |
9c03b2c0 | 588 | brelse(bp); |
7188ac27 KM |
589 | *countp = 0; |
590 | return (error); | |
9c03b2c0 SL |
591 | } |
592 | bap = bp->b_un.b_daddr; | |
b30358ab KM |
593 | MALLOC(copy, daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK); |
594 | bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize); | |
9c03b2c0 SL |
595 | bzero((caddr_t)&bap[last + 1], |
596 | (u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t)); | |
e038406d KM |
597 | if (last == -1) |
598 | bp->b_flags |= B_INVAL; | |
7188ac27 KM |
599 | error = bwrite(bp); |
600 | if (error) | |
601 | allerror = error; | |
b30358ab | 602 | bap = copy; |
4f083fd7 | 603 | |
9c03b2c0 SL |
604 | /* |
605 | * Recursively free totally unused blocks. | |
606 | */ | |
607 | for (i = NINDIR(fs) - 1; i > last; i--) { | |
5d5124a1 | 608 | nb = bap[i]; |
4f083fd7 | 609 | if (nb == 0) |
5d5124a1 | 610 | continue; |
7188ac27 KM |
611 | if (level > SINGLE) { |
612 | error = indirtrunc(ip, nb, (daddr_t)-1, level - 1, | |
613 | &blkcount); | |
614 | if (error) | |
615 | allerror = error; | |
616 | blocksreleased += blkcount; | |
617 | } | |
ced3a252 | 618 | blkfree(ip, nb, (off_t)fs->fs_bsize); |
4f083fd7 | 619 | blocksreleased += nblocks; |
4f083fd7 | 620 | } |
9c03b2c0 SL |
621 | |
622 | /* | |
623 | * Recursively free last partial block. | |
624 | */ | |
625 | if (level > SINGLE && lastbn >= 0) { | |
626 | last = lastbn % factor; | |
4f083fd7 | 627 | nb = bap[i]; |
7188ac27 KM |
628 | if (nb != 0) { |
629 | error = indirtrunc(ip, nb, last, level - 1, &blkcount); | |
630 | if (error) | |
631 | allerror = error; | |
632 | blocksreleased += blkcount; | |
633 | } | |
5d5124a1 | 634 | } |
b30358ab | 635 | FREE(copy, M_TEMP); |
7188ac27 KM |
636 | *countp = blocksreleased; |
637 | return (allerror); | |
5d5124a1 BJ |
638 | } |
639 | ||
d6a210b8 | 640 | /* |
7494ef16 | 641 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
d6a210b8 | 642 | */ |
7494ef16 BJ |
643 | ilock(ip) |
644 | register struct inode *ip; | |
d6a210b8 BJ |
645 | { |
646 | ||
7188ac27 KM |
647 | while (ip->i_flag & ILOCKED) { |
648 | ip->i_flag |= IWANT; | |
c6f5111d | 649 | if (ip->i_spare0 == curproc->p_pid) |
71c4cb8d | 650 | panic("locking against myself"); |
c6f5111d | 651 | ip->i_spare1 = curproc->p_pid; |
7188ac27 KM |
652 | (void) sleep((caddr_t)ip, PINOD); |
653 | } | |
71c4cb8d | 654 | ip->i_spare1 = 0; |
c6f5111d | 655 | ip->i_spare0 = curproc->p_pid; |
7188ac27 | 656 | ip->i_flag |= ILOCKED; |
d6a210b8 BJ |
657 | } |
658 | ||
659 | /* | |
7494ef16 | 660 | * Unlock an inode. If WANT bit is on, wakeup. |
d6a210b8 | 661 | */ |
ff56f48a | 662 | iunlock(ip) |
7494ef16 | 663 | register struct inode *ip; |
d6a210b8 BJ |
664 | { |
665 | ||
7188ac27 | 666 | if ((ip->i_flag & ILOCKED) == 0) |
e038406d | 667 | vprint("iunlock: unlocked inode", ITOV(ip)); |
71c4cb8d | 668 | ip->i_spare0 = 0; |
7188ac27 KM |
669 | ip->i_flag &= ~ILOCKED; |
670 | if (ip->i_flag&IWANT) { | |
671 | ip->i_flag &= ~IWANT; | |
672 | wakeup((caddr_t)ip); | |
673 | } | |
674 | } |