Commit | Line | Data |
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da7c5cc6 | 1 | /* |
7795cb4d | 2 | * Copyright (c) 1986, 1989, 1991 Regents of the University of California. |
7188ac27 | 3 | * All rights reserved. |
da7c5cc6 | 4 | * |
b702c21d | 5 | * %sccs.include.redist.c% |
7188ac27 | 6 | * |
55134c58 | 7 | * @(#)lfs_inode.c 7.80 (Berkeley) %G% |
da7c5cc6 | 8 | */ |
5d5124a1 | 9 | |
29ad237c KB |
10 | #include <sys/param.h> |
11 | #include <sys/systm.h> | |
12 | #include <sys/mount.h> | |
13 | #include <sys/proc.h> | |
14 | #include <sys/file.h> | |
15 | #include <sys/buf.h> | |
16 | #include <sys/vnode.h> | |
17 | #include <sys/kernel.h> | |
18 | #include <sys/malloc.h> | |
5d5124a1 | 19 | |
89663819 KM |
20 | #include <vm/vm.h> |
21 | ||
7795cb4d KB |
22 | #include <ufs/ufs/quota.h> |
23 | #include <ufs/ufs/inode.h> | |
24 | #include <ufs/ufs/ufsmount.h> | |
25 | #include <ufs/ufs/ufs_extern.h> | |
c6f5111d | 26 | |
7795cb4d KB |
27 | #include <ufs/lfs/lfs.h> |
28 | #include <ufs/lfs/lfs_extern.h> | |
2bf2d153 | 29 | |
0a0d4fba | 30 | int |
0b4d6502 | 31 | lfs_init() |
5d5124a1 | 32 | { |
29ad237c | 33 | return (ufs_init()); |
5d5124a1 BJ |
34 | } |
35 | ||
841fa75e | 36 | /* Search a block for a specific dinode. */ |
b4de8c04 | 37 | struct dinode * |
841fa75e KB |
38 | lfs_ifind(fs, ino, dip) |
39 | struct lfs *fs; | |
40 | ino_t ino; | |
41 | register struct dinode *dip; | |
42 | { | |
43 | register int cnt; | |
3ce71481 | 44 | register struct dinode *ldip; |
841fa75e | 45 | |
3ce71481 KB |
46 | for (cnt = INOPB(fs), ldip = dip + (cnt - 1); cnt--; --ldip) |
47 | if (ldip->di_inum == ino) | |
48 | return (ldip); | |
841fa75e KB |
49 | |
50 | panic("lfs_ifind: dinode %u not found", ino); | |
51 | /* NOTREACHED */ | |
52 | } | |
53 | ||
0a0d4fba | 54 | int |
b4de8c04 KB |
55 | lfs_update(ap) |
56 | struct vop_update_args /* { | |
57 | struct vnode *a_vp; | |
58 | struct timeval *a_ta; | |
59 | struct timeval *a_tm; | |
60 | int a_waitfor; | |
61 | } */ *ap; | |
ff56f48a | 62 | { |
406c9a0d | 63 | struct vnode *vp = ap->a_vp; |
ffcee610 KM |
64 | struct inode *ip; |
65 | ||
406c9a0d | 66 | if (vp->v_mount->mnt_flag & MNT_RDONLY) |
ffcee610 | 67 | return (0); |
406c9a0d | 68 | ip = VTOI(vp); |
4ec7cf31 | 69 | if ((ip->i_flag & (IUPD | IACC | ICHG | IMOD)) == 0) |
ffcee610 | 70 | return (0); |
4ec7cf31 | 71 | if (ip->i_flag & IACC) |
7e11a0c9 | 72 | ip->i_atime.ts_sec = ap->a_ta->tv_sec; |
4ec7cf31 | 73 | if (ip->i_flag & IUPD) { |
7e11a0c9 | 74 | ip->i_mtime.ts_sec = ap->a_tm->tv_sec; |
d9011ad6 | 75 | (ip)->i_modrev++; |
5b51b344 | 76 | } |
4ec7cf31 | 77 | if (ip->i_flag & ICHG) |
7e11a0c9 | 78 | ip->i_ctime.ts_sec = time.tv_sec; |
4ec7cf31 | 79 | ip->i_flag &= ~(IUPD|IACC|ICHG); |
ffcee610 | 80 | |
4ec7cf31 KB |
81 | if (!(ip->i_flag & IMOD)) |
82 | ++(VFSTOUFS(vp->v_mount)->um_lfs->lfs_uinodes); | |
83 | ip->i_flag |= IMOD; | |
84 | ||
85 | /* If sync, push back the vnode and any dirty blocks it may have. */ | |
486f8af1 | 86 | return (ap->a_waitfor & LFS_SYNC ? lfs_vflush(vp) : 0); |
5d5124a1 BJ |
87 | } |
88 | ||
2c68aab8 | 89 | /* Update segment usage information when removing a block. */ |
4ee2ad24 KB |
90 | #define UPDATE_SEGUSE \ |
91 | if (lastseg != -1) { \ | |
92 | LFS_SEGENTRY(sup, fs, lastseg, sup_bp); \ | |
6b82c196 KB |
93 | if ((num << fs->lfs_bshift) > sup->su_nbytes) \ |
94 | panic("lfs_truncate: negative bytes in segment %d\n", \ | |
95 | lastseg); \ | |
5b792b30 | 96 | sup->su_nbytes -= num << fs->lfs_bshift; \ |
4ec7cf31 | 97 | e1 = VOP_BWRITE(sup_bp); \ |
4ee2ad24 KB |
98 | blocksreleased += num; \ |
99 | } | |
2c68aab8 KB |
100 | |
101 | #define SEGDEC { \ | |
f2bd68a0 | 102 | if (daddr != 0) { \ |
2c68aab8 KB |
103 | if (lastseg != (seg = datosn(fs, daddr))) { \ |
104 | UPDATE_SEGUSE; \ | |
105 | num = 1; \ | |
106 | lastseg = seg; \ | |
107 | } else \ | |
108 | ++num; \ | |
109 | } \ | |
110 | } | |
111 | ||
5d5124a1 | 112 | /* |
2c68aab8 KB |
113 | * Truncate the inode ip to at most length size. Update segment usage |
114 | * table information. | |
5d5124a1 | 115 | */ |
29ad237c KB |
116 | /* ARGSUSED */ |
117 | int | |
b4de8c04 KB |
118 | lfs_truncate(ap) |
119 | struct vop_truncate_args /* { | |
120 | struct vnode *a_vp; | |
121 | off_t a_length; | |
122 | int a_flags; | |
123 | struct ucred *a_cred; | |
124 | struct proc *a_p; | |
125 | } */ *ap; | |
5d5124a1 | 126 | { |
8f42dbe0 | 127 | register INDIR *inp; |
2c68aab8 KB |
128 | register int i; |
129 | register daddr_t *daddrp; | |
b4de8c04 KB |
130 | register struct vnode *vp = ap->a_vp; |
131 | off_t length = ap->a_length; | |
4ee2ad24 | 132 | struct buf *bp, *sup_bp; |
d942bf69 | 133 | struct timeval tv; |
b3071295 | 134 | struct ifile *ifp; |
2c68aab8 KB |
135 | struct inode *ip; |
136 | struct lfs *fs; | |
137 | INDIR a[NIADDR + 2], a_end[NIADDR + 2]; | |
138 | SEGUSE *sup; | |
139 | daddr_t daddr, lastblock, lbn, olastblock; | |
55134c58 | 140 | long off, a_released, blocksreleased, i_released; |
b4de8c04 | 141 | int e1, e2, depth, lastseg, num, offset, seg, size; |
4f083fd7 | 142 | |
e4b973c5 KB |
143 | ip = VTOI(vp); |
144 | tv = time; | |
145 | if (vp->v_type == VLNK && vp->v_mount->mnt_maxsymlinklen > 0) { | |
146 | #ifdef DIAGNOSTIC | |
147 | if (length != 0) | |
148 | panic("lfs_truncate: partial truncate of symlink"); | |
149 | #endif | |
150 | bzero((char *)&ip->i_shortlink, (u_int)ip->i_size); | |
151 | ip->i_size = 0; | |
152 | ip->i_flag |= ICHG|IUPD; | |
486f8af1 | 153 | return (VOP_UPDATE(vp, &tv, &tv, 0)); |
e4b973c5 | 154 | } |
b4de8c04 | 155 | vnode_pager_setsize(vp, (u_long)length); |
b3071295 | 156 | |
b3071295 KB |
157 | fs = ip->i_lfs; |
158 | ||
b4de8c04 KB |
159 | /* If length is larger than the file, just update the times. */ |
160 | if (ip->i_size <= length) { | |
2c68aab8 | 161 | ip->i_flag |= ICHG|IUPD; |
486f8af1 | 162 | return (VOP_UPDATE(vp, &tv, &tv, 0)); |
7b2e4f05 | 163 | } |
b3071295 | 164 | |
2c68aab8 KB |
165 | /* |
166 | * Calculate index into inode's block list of last direct and indirect | |
167 | * blocks (if any) which we want to keep. Lastblock is 0 when the | |
168 | * file is truncated to 0. | |
169 | */ | |
b4de8c04 | 170 | lastblock = lblkno(fs, length + fs->lfs_bsize - 1); |
2c68aab8 | 171 | olastblock = lblkno(fs, ip->i_size + fs->lfs_bsize - 1) - 1; |
29ad237c | 172 | |
c0bb1685 | 173 | /* |
29ad237c KB |
174 | * Update the size of the file. If the file is not being truncated to |
175 | * a block boundry, the contents of the partial block following the end | |
176 | * of the file must be zero'ed in case it ever become accessable again | |
177 | * because of subsequent file growth. | |
28821bc5 | 178 | */ |
b4de8c04 | 179 | offset = blkoff(fs, length); |
29ad237c | 180 | if (offset == 0) |
b4de8c04 | 181 | ip->i_size = length; |
29ad237c | 182 | else { |
b4de8c04 | 183 | lbn = lblkno(fs, length); |
4b61628b | 184 | #ifdef QUOTA |
b4de8c04 KB |
185 | if (e1 = getinoquota(ip)) |
186 | return (e1); | |
d5075120 | 187 | #endif |
b4de8c04 KB |
188 | if (e1 = bread(vp, lbn, fs->lfs_bsize, NOCRED, &bp)) |
189 | return (e1); | |
190 | ip->i_size = length; | |
a79b7b81 | 191 | size = blksize(fs); |
b4de8c04 | 192 | (void)vnode_pager_uncache(vp); |
a5e62f37 | 193 | bzero(bp->b_un.b_addr + offset, (unsigned)(size - offset)); |
9cf42d55 | 194 | allocbuf(bp, size); |
4ec7cf31 KB |
195 | if (e1 = VOP_BWRITE(bp)) |
196 | return (e1); | |
5d5124a1 | 197 | } |
f28a1334 | 198 | /* |
2c68aab8 KB |
199 | * Modify sup->su_nbyte counters for each deleted block; keep track |
200 | * of number of blocks removed for ip->i_blocks. | |
201 | */ | |
202 | blocksreleased = 0; | |
203 | num = 0; | |
204 | lastseg = -1; | |
205 | ||
206 | for (lbn = olastblock; lbn >= lastblock;) { | |
b4de8c04 | 207 | lfs_bmaparray(vp, lbn, &daddr, a, &depth); |
2c68aab8 KB |
208 | if (lbn == olastblock) |
209 | for (i = NIADDR + 2; i--;) | |
210 | a_end[i] = a[i]; | |
211 | switch (depth) { | |
212 | case 0: /* Direct block. */ | |
213 | daddr = ip->i_db[lbn]; | |
214 | SEGDEC; | |
215 | ip->i_db[lbn] = 0; | |
216 | --lbn; | |
217 | break; | |
218 | #ifdef DIAGNOSTIC | |
219 | case 1: /* An indirect block. */ | |
220 | panic("lfs_truncate: lfs_bmaparray returned depth 1"); | |
221 | /* NOTREACHED */ | |
222 | #endif | |
223 | default: /* Chain of indirect blocks. */ | |
8f42dbe0 JH |
224 | inp = a + --depth; |
225 | if (inp->in_off > 0 && lbn != lastblock) { | |
226 | lbn -= inp->in_off < lbn - lastblock ? | |
227 | inp->in_off : lbn - lastblock; | |
2c68aab8 KB |
228 | break; |
229 | } | |
8f42dbe0 JH |
230 | for (; depth && (inp->in_off == 0 || lbn == lastblock); |
231 | --inp, --depth) { | |
b4de8c04 | 232 | if (bread(vp, |
8f42dbe0 | 233 | inp->in_lbn, fs->lfs_bsize, NOCRED, &bp)) |
2c68aab8 | 234 | panic("lfs_truncate: bread bno %d", |
8f42dbe0 JH |
235 | inp->in_lbn); |
236 | daddrp = bp->b_un.b_daddr + inp->in_off; | |
237 | for (i = inp->in_off; | |
2c68aab8 KB |
238 | i++ <= a_end[depth].in_off;) { |
239 | daddr = *daddrp++; | |
240 | SEGDEC; | |
241 | } | |
c86ca11e | 242 | a_end[depth].in_off = NINDIR(fs) - 1; |
8f42dbe0 | 243 | if (inp->in_off == 0) |
c86ca11e CS |
244 | brelse (bp); |
245 | else { | |
8f42dbe0 | 246 | bzero(bp->b_un.b_daddr + inp->in_off, |
2c68aab8 | 247 | fs->lfs_bsize - |
8f42dbe0 | 248 | inp->in_off * sizeof(daddr_t)); |
4ec7cf31 KB |
249 | if (e1 = VOP_BWRITE(bp)) |
250 | return (e1); | |
c86ca11e | 251 | } |
2c68aab8 | 252 | } |
c86ca11e | 253 | if (depth == 0 && a[1].in_off == 0) { |
2c68aab8 KB |
254 | off = a[0].in_off; |
255 | daddr = ip->i_ib[off]; | |
256 | SEGDEC; | |
257 | ip->i_ib[off] = 0; | |
258 | } | |
5b792b30 | 259 | if (lbn == lastblock || lbn <= NDADDR) |
2c68aab8 KB |
260 | --lbn; |
261 | else { | |
262 | lbn -= NINDIR(fs); | |
263 | if (lbn < lastblock) | |
264 | lbn = lastblock; | |
265 | } | |
266 | } | |
267 | } | |
4ee2ad24 | 268 | UPDATE_SEGUSE; |
6b82c196 KB |
269 | |
270 | /* If truncating the file to 0, update the version number. */ | |
271 | if (length == 0) { | |
272 | LFS_IENTRY(ifp, fs, ip->i_number, bp); | |
273 | ++ifp->if_version; | |
4ec7cf31 | 274 | (void) VOP_BWRITE(bp); |
6b82c196 KB |
275 | } |
276 | ||
7f06053c | 277 | #ifdef DIAGNOSTIC |
4ec7cf31 | 278 | if (ip->i_blocks < fsbtodb(fs, blocksreleased)) |
7f06053c KB |
279 | panic("lfs_truncate: block count < 0"); |
280 | #endif | |
4ec7cf31 KB |
281 | ip->i_blocks -= fsbtodb(fs, blocksreleased); |
282 | fs->lfs_bfree += fsbtodb(fs, blocksreleased); | |
2c68aab8 | 283 | ip->i_flag |= ICHG|IUPD; |
4ec7cf31 KB |
284 | /* |
285 | * Traverse dirty block list counting number of dirty buffers | |
286 | * that are being deleted out of the cache, so that the lfs_avail | |
287 | * field can be updated. | |
288 | */ | |
55134c58 MS |
289 | a_released = 0; |
290 | i_released = 0; | |
4ec7cf31 | 291 | for (bp = vp->v_dirtyblkhd; bp; bp = bp->b_blockf) |
55134c58 MS |
292 | if (bp->b_flags & B_LOCKED) { |
293 | ++a_released; | |
294 | /* | |
295 | * XXX | |
296 | * When buffers are created in the cache, their block | |
297 | * number is set equal to their logical block number. | |
298 | * If that is still true, we are assuming that the | |
299 | * blocks are new (not yet on disk) and weren't | |
300 | * counted above. However, there is a slight chance | |
301 | * that a block's disk address is equal to its logical | |
302 | * block number in which case, we'll get an overcounting | |
303 | * here. | |
304 | */ | |
305 | if (bp->b_blkno == bp->b_lblkno) | |
306 | ++i_released; | |
307 | } | |
308 | blocksreleased = fsbtodb(fs, i_released); | |
309 | #ifdef DIAGNOSTIC | |
310 | if (blocksreleased > ip->i_blocks) { | |
311 | printf("lfs_inode: Warning! %s\n", | |
312 | "more blocks released from inode than are in inode"); | |
313 | blocksreleased = ip->i_blocks; | |
314 | } | |
315 | #endif | |
316 | fs->lfs_bfree += blocksreleased; | |
317 | ip->i_blocks -= blocksreleased; | |
318 | #ifdef DIAGNOSTIC | |
319 | if (length == 0 && ip->i_blocks != 0) | |
320 | printf("lfs_inode: Warning! %s%d%s\n", | |
321 | "Truncation to zero, but ", ip->i_blocks, | |
322 | " blocks left on inode"); | |
323 | #endif | |
324 | fs->lfs_avail -= fsbtodb(fs, a_released); | |
b4de8c04 | 325 | e1 = vinvalbuf(vp, length > 0, ap->a_cred, ap->a_p); |
e4b973c5 | 326 | e2 = VOP_UPDATE(vp, &tv, &tv, 0); |
b4de8c04 | 327 | return (e1 ? e1 : e2 ? e2 : 0); |
7188ac27 | 328 | } |