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 | * |
c6f5111d | 7 | * @(#)ufs_inode.c 7.38 (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 | */ | |
7188ac27 KM |
233 | ufs_inactive(vp) |
234 | struct vnode *vp; | |
ff56f48a | 235 | { |
7188ac27 | 236 | register struct inode *ip = VTOI(vp); |
a1e9dd57 | 237 | int mode, error = 0; |
7188ac27 | 238 | |
0811b508 | 239 | if (prtactive && vp->v_usecount != 0) |
e038406d | 240 | vprint("ufs_inactive: pushing active", vp); |
b5ea418e KM |
241 | /* |
242 | * Get rid of inodes related to stale file handles. | |
243 | */ | |
1259a9f9 | 244 | if (ip->i_mode == 0) { |
e038406d KM |
245 | if ((vp->v_flag & VXLOCK) == 0) |
246 | vgone(vp); | |
1259a9f9 KM |
247 | return (0); |
248 | } | |
aed86454 | 249 | ILOCK(ip); |
82161bc8 | 250 | if (ip->i_nlink <= 0 && (vp->v_mount->mnt_flag & MNT_RDONLY) == 0) { |
4b61628b KM |
251 | #ifdef QUOTA |
252 | if (!getinoquota(ip)) | |
253 | (void) chkiq(ip, -1, NOCRED, 0); | |
254 | #endif | |
e038406d | 255 | error = itrunc(ip, (u_long)0, 0); |
7188ac27 KM |
256 | mode = ip->i_mode; |
257 | ip->i_mode = 0; | |
e9cacd5b | 258 | ip->i_rdev = 0; |
7188ac27 KM |
259 | ip->i_flag |= IUPD|ICHG; |
260 | ifree(ip, ip->i_number, mode); | |
7188ac27 KM |
261 | } |
262 | IUPDAT(ip, &time, &time, 0); | |
d11dbec7 KM |
263 | IUNLOCK(ip); |
264 | ip->i_flag = 0; | |
7188ac27 | 265 | /* |
a1e9dd57 KM |
266 | * If we are done with the inode, reclaim it |
267 | * so that it can be reused immediately. | |
7188ac27 | 268 | */ |
4b61628b | 269 | if (vp->v_usecount == 0 && ip->i_mode == 0) |
d11dbec7 | 270 | vgone(vp); |
7188ac27 | 271 | return (error); |
5d5124a1 BJ |
272 | } |
273 | ||
274 | /* | |
a1e9dd57 KM |
275 | * Reclaim an inode so that it can be used for other purposes. |
276 | */ | |
277 | ufs_reclaim(vp) | |
278 | register struct vnode *vp; | |
279 | { | |
ff4fb102 | 280 | register struct inode *ip = VTOI(vp); |
4b61628b | 281 | int i; |
a1e9dd57 | 282 | |
0811b508 | 283 | if (prtactive && vp->v_usecount != 0) |
e038406d | 284 | vprint("ufs_reclaim: pushing active", vp); |
a1e9dd57 KM |
285 | /* |
286 | * Remove the inode from its hash chain. | |
287 | */ | |
288 | remque(ip); | |
289 | ip->i_forw = ip; | |
290 | ip->i_back = ip; | |
291 | /* | |
292 | * Purge old data structures associated with the inode. | |
293 | */ | |
294 | cache_purge(vp); | |
295 | if (ip->i_devvp) { | |
296 | vrele(ip->i_devvp); | |
297 | ip->i_devvp = 0; | |
298 | } | |
299 | #ifdef QUOTA | |
4b61628b KM |
300 | for (i = 0; i < MAXQUOTAS; i++) { |
301 | if (ip->i_dquot[i] != NODQUOT) { | |
302 | dqrele(vp, ip->i_dquot[i]); | |
303 | ip->i_dquot[i] = NODQUOT; | |
304 | } | |
305 | } | |
a1e9dd57 | 306 | #endif |
a1e9dd57 KM |
307 | ip->i_flag = 0; |
308 | return (0); | |
309 | } | |
310 | ||
311 | /* | |
312 | * Check accessed and update flags on an inode structure. | |
313 | * If any is on, update the inode with the current time. | |
314 | * If waitfor is given, then must ensure I/O order, | |
315 | * so wait for write to complete. | |
5d5124a1 | 316 | */ |
c0bb1685 | 317 | iupdat(ip, ta, tm, waitfor) |
7494ef16 | 318 | register struct inode *ip; |
b32450f4 | 319 | struct timeval *ta, *tm; |
7494ef16 | 320 | int waitfor; |
5d5124a1 | 321 | { |
7188ac27 KM |
322 | struct buf *bp; |
323 | struct vnode *vp = ITOV(ip); | |
5d5124a1 | 324 | struct dinode *dp; |
ec67a3ce | 325 | register struct fs *fs; |
5d5124a1 | 326 | |
ec67a3ce | 327 | fs = ip->i_fs; |
7188ac27 KM |
328 | if ((ip->i_flag & (IUPD|IACC|ICHG|IMOD)) == 0) |
329 | return (0); | |
82161bc8 | 330 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
7188ac27 KM |
331 | return (0); |
332 | error = bread(ip->i_devvp, fsbtodb(fs, itod(fs, ip->i_number)), | |
a937f856 | 333 | (int)fs->fs_bsize, NOCRED, &bp); |
7188ac27 KM |
334 | if (error) { |
335 | brelse(bp); | |
336 | return (error); | |
337 | } | |
338 | if (ip->i_flag&IACC) | |
339 | ip->i_atime = ta->tv_sec; | |
340 | if (ip->i_flag&IUPD) | |
341 | ip->i_mtime = tm->tv_sec; | |
342 | if (ip->i_flag&ICHG) | |
343 | ip->i_ctime = time.tv_sec; | |
344 | ip->i_flag &= ~(IUPD|IACC|ICHG|IMOD); | |
345 | dp = bp->b_un.b_dino + itoo(fs, ip->i_number); | |
a1e9dd57 | 346 | *dp = ip->i_din; |
7188ac27 KM |
347 | if (waitfor) { |
348 | return (bwrite(bp)); | |
349 | } else { | |
350 | bdwrite(bp); | |
351 | return (0); | |
5d5124a1 BJ |
352 | } |
353 | } | |
354 | ||
9c03b2c0 SL |
355 | #define SINGLE 0 /* index of single indirect block */ |
356 | #define DOUBLE 1 /* index of double indirect block */ | |
357 | #define TRIPLE 2 /* index of triple indirect block */ | |
5d5124a1 | 358 | /* |
a1e9dd57 KM |
359 | * Truncate the inode ip to at most length size. Free affected disk |
360 | * blocks -- the blocks of the file are removed in reverse order. | |
9c03b2c0 SL |
361 | * |
362 | * NB: triple indirect blocks are untested. | |
5d5124a1 | 363 | */ |
e038406d | 364 | itrunc(oip, length, flags) |
28821bc5 | 365 | register struct inode *oip; |
4f083fd7 | 366 | u_long length; |
e038406d | 367 | int flags; |
5d5124a1 | 368 | { |
4f083fd7 | 369 | register daddr_t lastblock; |
a5e62f37 | 370 | daddr_t bn, lbn, lastiblock[NIADDR]; |
6459ebe0 | 371 | register struct fs *fs; |
9c03b2c0 | 372 | register struct inode *ip; |
28821bc5 | 373 | struct buf *bp; |
7188ac27 KM |
374 | int offset, osize, size, level; |
375 | long count, nblocks, blocksreleased = 0; | |
28821bc5 | 376 | register int i; |
e038406d | 377 | int aflags, error, allerror; |
9c03b2c0 | 378 | struct inode tip; |
4f083fd7 | 379 | |
8986c97c | 380 | vnode_pager_setsize(ITOV(oip), length); |
7b2e4f05 SL |
381 | if (oip->i_size <= length) { |
382 | oip->i_flag |= ICHG|IUPD; | |
7188ac27 KM |
383 | error = iupdat(oip, &time, &time, 1); |
384 | return (error); | |
7b2e4f05 | 385 | } |
c0bb1685 | 386 | /* |
9c03b2c0 SL |
387 | * Calculate index into inode's block list of |
388 | * last direct and indirect blocks (if any) | |
389 | * which we want to keep. Lastblock is -1 when | |
390 | * the file is truncated to 0. | |
c0bb1685 | 391 | */ |
9c03b2c0 | 392 | fs = oip->i_fs; |
4f083fd7 | 393 | lastblock = lblkno(fs, length + fs->fs_bsize - 1) - 1; |
9c03b2c0 SL |
394 | lastiblock[SINGLE] = lastblock - NDADDR; |
395 | lastiblock[DOUBLE] = lastiblock[SINGLE] - NINDIR(fs); | |
396 | lastiblock[TRIPLE] = lastiblock[DOUBLE] - NINDIR(fs) * NINDIR(fs); | |
08d9a8ec | 397 | nblocks = btodb(fs->fs_bsize); |
6459ebe0 | 398 | /* |
28821bc5 KM |
399 | * Update the size of the file. If the file is not being |
400 | * truncated to a block boundry, the contents of the | |
401 | * partial block following the end of the file must be | |
402 | * zero'ed in case it ever become accessable again because | |
403 | * of subsequent file growth. | |
404 | */ | |
405 | osize = oip->i_size; | |
406 | offset = blkoff(fs, length); | |
407 | if (offset == 0) { | |
408 | oip->i_size = length; | |
409 | } else { | |
410 | lbn = lblkno(fs, length); | |
e038406d KM |
411 | aflags = B_CLRBUF; |
412 | if (flags & IO_SYNC) | |
413 | aflags |= B_SYNC; | |
4b61628b KM |
414 | #ifdef QUOTA |
415 | if (error = getinoquota(oip)) | |
416 | return (error); | |
417 | #endif | |
e038406d | 418 | if (error = balloc(oip, lbn, offset, &bp, aflags)) |
7188ac27 | 419 | return (error); |
28821bc5 KM |
420 | oip->i_size = length; |
421 | size = blksize(fs, oip, lbn); | |
8986c97c | 422 | (void) vnode_pager_uncache(ITOV(oip)); |
a5e62f37 | 423 | bzero(bp->b_un.b_addr + offset, (unsigned)(size - offset)); |
9cf42d55 | 424 | allocbuf(bp, size); |
e038406d KM |
425 | if (flags & IO_SYNC) |
426 | bwrite(bp); | |
427 | else | |
428 | bdwrite(bp); | |
28821bc5 KM |
429 | } |
430 | /* | |
431 | * Update file and block pointers | |
9c03b2c0 SL |
432 | * on disk before we start freeing blocks. |
433 | * If we crash before free'ing blocks below, | |
434 | * the blocks will be returned to the free list. | |
435 | * lastiblock values are also normalized to -1 | |
436 | * for calls to indirtrunc below. | |
6459ebe0 | 437 | */ |
9c03b2c0 | 438 | tip = *oip; |
28821bc5 | 439 | tip.i_size = osize; |
9c03b2c0 SL |
440 | for (level = TRIPLE; level >= SINGLE; level--) |
441 | if (lastiblock[level] < 0) { | |
442 | oip->i_ib[level] = 0; | |
443 | lastiblock[level] = -1; | |
4f083fd7 | 444 | } |
9c03b2c0 SL |
445 | for (i = NDADDR - 1; i > lastblock; i--) |
446 | oip->i_db[i] = 0; | |
9c03b2c0 | 447 | oip->i_flag |= ICHG|IUPD; |
e038406d | 448 | vinvalbuf(ITOV(oip), (length > 0)); |
2fc1f182 | 449 | allerror = iupdat(oip, &time, &time, MNT_WAIT); |
9c03b2c0 | 450 | |
6459ebe0 | 451 | /* |
9c03b2c0 | 452 | * Indirect blocks first. |
6459ebe0 | 453 | */ |
28821bc5 | 454 | ip = &tip; |
9c03b2c0 SL |
455 | for (level = TRIPLE; level >= SINGLE; level--) { |
456 | bn = ip->i_ib[level]; | |
4f083fd7 | 457 | if (bn != 0) { |
7188ac27 KM |
458 | error = indirtrunc(ip, bn, lastiblock[level], level, |
459 | &count); | |
460 | if (error) | |
461 | allerror = error; | |
462 | blocksreleased += count; | |
9c03b2c0 SL |
463 | if (lastiblock[level] < 0) { |
464 | ip->i_ib[level] = 0; | |
ced3a252 | 465 | blkfree(ip, bn, (off_t)fs->fs_bsize); |
9c03b2c0 | 466 | blocksreleased += nblocks; |
9c03b2c0 SL |
467 | } |
468 | } | |
469 | if (lastiblock[level] >= 0) | |
470 | goto done; | |
4f083fd7 | 471 | } |
9c03b2c0 | 472 | |
6459ebe0 | 473 | /* |
9c03b2c0 | 474 | * All whole direct blocks or frags. |
6459ebe0 | 475 | */ |
4f083fd7 | 476 | for (i = NDADDR - 1; i > lastblock; i--) { |
8011f5df | 477 | register off_t bsize; |
4f083fd7 | 478 | |
6459ebe0 | 479 | bn = ip->i_db[i]; |
4f083fd7 | 480 | if (bn == 0) |
5d5124a1 | 481 | continue; |
4f083fd7 | 482 | ip->i_db[i] = 0; |
0b355a6e | 483 | bsize = (off_t)blksize(fs, ip, i); |
ced3a252 | 484 | blkfree(ip, bn, bsize); |
0b355a6e | 485 | blocksreleased += btodb(bsize); |
4f083fd7 | 486 | } |
9c03b2c0 SL |
487 | if (lastblock < 0) |
488 | goto done; | |
489 | ||
4f083fd7 SL |
490 | /* |
491 | * Finally, look for a change in size of the | |
492 | * last direct block; release any frags. | |
493 | */ | |
9c03b2c0 SL |
494 | bn = ip->i_db[lastblock]; |
495 | if (bn != 0) { | |
8011f5df | 496 | off_t oldspace, newspace; |
9c03b2c0 | 497 | |
4f083fd7 SL |
498 | /* |
499 | * Calculate amount of space we're giving | |
500 | * back as old block size minus new block size. | |
501 | */ | |
9c03b2c0 | 502 | oldspace = blksize(fs, ip, lastblock); |
4f083fd7 | 503 | ip->i_size = length; |
9c03b2c0 SL |
504 | newspace = blksize(fs, ip, lastblock); |
505 | if (newspace == 0) | |
506 | panic("itrunc: newspace"); | |
507 | if (oldspace - newspace > 0) { | |
4f083fd7 SL |
508 | /* |
509 | * Block number of space to be free'd is | |
510 | * the old block # plus the number of frags | |
511 | * required for the storage we're keeping. | |
512 | */ | |
9c03b2c0 | 513 | bn += numfrags(fs, newspace); |
ced3a252 | 514 | blkfree(ip, bn, oldspace - newspace); |
08d9a8ec | 515 | blocksreleased += btodb(oldspace - newspace); |
4f083fd7 | 516 | } |
5d5124a1 | 517 | } |
4f083fd7 | 518 | done: |
9c03b2c0 SL |
519 | /* BEGIN PARANOIA */ |
520 | for (level = SINGLE; level <= TRIPLE; level++) | |
521 | if (ip->i_ib[level] != oip->i_ib[level]) | |
522 | panic("itrunc1"); | |
523 | for (i = 0; i < NDADDR; i++) | |
524 | if (ip->i_db[i] != oip->i_db[i]) | |
525 | panic("itrunc2"); | |
526 | /* END PARANOIA */ | |
08d9a8ec SL |
527 | oip->i_blocks -= blocksreleased; |
528 | if (oip->i_blocks < 0) /* sanity */ | |
529 | oip->i_blocks = 0; | |
530 | oip->i_flag |= ICHG; | |
b4567e9c | 531 | #ifdef QUOTA |
4b61628b KM |
532 | if (!getinoquota(oip)) |
533 | (void) chkdq(oip, -blocksreleased, NOCRED, 0); | |
89045c38 | 534 | #endif |
7188ac27 | 535 | return (allerror); |
5d5124a1 BJ |
536 | } |
537 | ||
4f083fd7 SL |
538 | /* |
539 | * Release blocks associated with the inode ip and | |
540 | * stored in the indirect block bn. Blocks are free'd | |
541 | * in LIFO order up to (but not including) lastbn. If | |
9c03b2c0 SL |
542 | * level is greater than SINGLE, the block is an indirect |
543 | * block and recursive calls to indirtrunc must be used to | |
544 | * cleanse other indirect blocks. | |
545 | * | |
546 | * NB: triple indirect blocks are untested. | |
4f083fd7 | 547 | */ |
7188ac27 | 548 | indirtrunc(ip, bn, lastbn, level, countp) |
6459ebe0 | 549 | register struct inode *ip; |
4f083fd7 | 550 | daddr_t bn, lastbn; |
9c03b2c0 | 551 | int level; |
7188ac27 | 552 | long *countp; |
5d5124a1 | 553 | { |
4f083fd7 | 554 | register int i; |
b30358ab | 555 | struct buf *bp; |
9c03b2c0 | 556 | register struct fs *fs = ip->i_fs; |
b30358ab KM |
557 | register daddr_t *bap; |
558 | daddr_t *copy, nb, last; | |
7188ac27 KM |
559 | long blkcount, factor; |
560 | int nblocks, blocksreleased = 0; | |
561 | int error, allerror = 0; | |
5d5124a1 | 562 | |
9c03b2c0 SL |
563 | /* |
564 | * Calculate index in current block of last | |
565 | * block to be kept. -1 indicates the entire | |
566 | * block so we need not calculate the index. | |
567 | */ | |
568 | factor = 1; | |
569 | for (i = SINGLE; i < level; i++) | |
570 | factor *= NINDIR(fs); | |
4f083fd7 | 571 | last = lastbn; |
9c03b2c0 SL |
572 | if (lastbn > 0) |
573 | last /= factor; | |
08d9a8ec | 574 | nblocks = btodb(fs->fs_bsize); |
9c03b2c0 SL |
575 | /* |
576 | * Get buffer of block pointers, zero those | |
577 | * entries corresponding to blocks to be free'd, | |
578 | * and update on disk copy first. | |
579 | */ | |
ec67a3ce MK |
580 | #ifdef SECSIZE |
581 | bp = bread(ip->i_dev, fsbtodb(fs, bn), (int)fs->fs_bsize, | |
582 | fs->fs_dbsize); | |
583 | #else SECSIZE | |
a937f856 KM |
584 | error = bread(ip->i_devvp, fsbtodb(fs, bn), (int)fs->fs_bsize, |
585 | NOCRED, &bp); | |
7188ac27 | 586 | if (error) { |
9c03b2c0 | 587 | brelse(bp); |
7188ac27 KM |
588 | *countp = 0; |
589 | return (error); | |
9c03b2c0 SL |
590 | } |
591 | bap = bp->b_un.b_daddr; | |
b30358ab KM |
592 | MALLOC(copy, daddr_t *, fs->fs_bsize, M_TEMP, M_WAITOK); |
593 | bcopy((caddr_t)bap, (caddr_t)copy, (u_int)fs->fs_bsize); | |
9c03b2c0 SL |
594 | bzero((caddr_t)&bap[last + 1], |
595 | (u_int)(NINDIR(fs) - (last + 1)) * sizeof (daddr_t)); | |
e038406d KM |
596 | if (last == -1) |
597 | bp->b_flags |= B_INVAL; | |
7188ac27 KM |
598 | error = bwrite(bp); |
599 | if (error) | |
600 | allerror = error; | |
b30358ab | 601 | bap = copy; |
4f083fd7 | 602 | |
9c03b2c0 SL |
603 | /* |
604 | * Recursively free totally unused blocks. | |
605 | */ | |
606 | for (i = NINDIR(fs) - 1; i > last; i--) { | |
5d5124a1 | 607 | nb = bap[i]; |
4f083fd7 | 608 | if (nb == 0) |
5d5124a1 | 609 | continue; |
7188ac27 KM |
610 | if (level > SINGLE) { |
611 | error = indirtrunc(ip, nb, (daddr_t)-1, level - 1, | |
612 | &blkcount); | |
613 | if (error) | |
614 | allerror = error; | |
615 | blocksreleased += blkcount; | |
616 | } | |
ced3a252 | 617 | blkfree(ip, nb, (off_t)fs->fs_bsize); |
4f083fd7 | 618 | blocksreleased += nblocks; |
4f083fd7 | 619 | } |
9c03b2c0 SL |
620 | |
621 | /* | |
622 | * Recursively free last partial block. | |
623 | */ | |
624 | if (level > SINGLE && lastbn >= 0) { | |
625 | last = lastbn % factor; | |
4f083fd7 | 626 | nb = bap[i]; |
7188ac27 KM |
627 | if (nb != 0) { |
628 | error = indirtrunc(ip, nb, last, level - 1, &blkcount); | |
629 | if (error) | |
630 | allerror = error; | |
631 | blocksreleased += blkcount; | |
632 | } | |
5d5124a1 | 633 | } |
b30358ab | 634 | FREE(copy, M_TEMP); |
7188ac27 KM |
635 | *countp = blocksreleased; |
636 | return (allerror); | |
5d5124a1 BJ |
637 | } |
638 | ||
d6a210b8 | 639 | /* |
7494ef16 | 640 | * Lock an inode. If its already locked, set the WANT bit and sleep. |
d6a210b8 | 641 | */ |
7494ef16 BJ |
642 | ilock(ip) |
643 | register struct inode *ip; | |
d6a210b8 BJ |
644 | { |
645 | ||
7188ac27 KM |
646 | while (ip->i_flag & ILOCKED) { |
647 | ip->i_flag |= IWANT; | |
c6f5111d | 648 | if (ip->i_spare0 == curproc->p_pid) |
71c4cb8d | 649 | panic("locking against myself"); |
c6f5111d | 650 | ip->i_spare1 = curproc->p_pid; |
7188ac27 KM |
651 | (void) sleep((caddr_t)ip, PINOD); |
652 | } | |
71c4cb8d | 653 | ip->i_spare1 = 0; |
c6f5111d | 654 | ip->i_spare0 = curproc->p_pid; |
7188ac27 | 655 | ip->i_flag |= ILOCKED; |
d6a210b8 BJ |
656 | } |
657 | ||
658 | /* | |
7494ef16 | 659 | * Unlock an inode. If WANT bit is on, wakeup. |
d6a210b8 | 660 | */ |
ff56f48a | 661 | iunlock(ip) |
7494ef16 | 662 | register struct inode *ip; |
d6a210b8 BJ |
663 | { |
664 | ||
7188ac27 | 665 | if ((ip->i_flag & ILOCKED) == 0) |
e038406d | 666 | vprint("iunlock: unlocked inode", ITOV(ip)); |
71c4cb8d | 667 | ip->i_spare0 = 0; |
7188ac27 KM |
668 | ip->i_flag &= ~ILOCKED; |
669 | if (ip->i_flag&IWANT) { | |
670 | ip->i_flag &= ~IWANT; | |
671 | wakeup((caddr_t)ip); | |
672 | } | |
673 | } |