7 * Write a lump to disk. Updates ia with an index address
8 * for the newly-written lump. Upon return, the lump will
9 * have been placed in the disk cache but will likely not be on disk yet.
12 storeclump(Index *ix, ZBlock *zb, u8int *sc, int type, u32int creator, IAddr *ia)
17 u8int bh[VtScoreSize];
20 trace(TraceLump, "storeclump enter", sc, type);
22 if(size > VtMaxLumpSize){
23 seterr(EStrange, "lump too large");
26 if(vttypevalid(type) < 0){
27 seterr(EStrange, "invalid lump type");
32 scoremem(bh, zb->data, size);
33 if(scorecmp(sc, bh) != 0){
34 seterr(ECorrupt, "storing clump: corrupted; expected=%V got=%V, size=%d", sc, bh, size);
39 cb = alloczblock(size + ClumpSize + U32Size, 0, 0);
44 cl.info.uncsize = size;
47 scorecp(cl.info.score, sc);
49 trace(TraceLump, "storeclump whackblock");
50 dsize = whackblock(&cb->data[ClumpSize], zb->data, size);
51 if(dsize > 0 && dsize < size){
52 cl.encoding = ClumpECompress;
55 fprint(2, "whack error: dsize=%d size=%d\n", dsize, size);
58 cl.encoding = ClumpENone;
60 memmove(&cb->data[ClumpSize], zb->data, size);
62 memset(cb->data+ClumpSize+dsize, 0, 4);
65 a = writeiclump(ix, &cl, cb->data);
66 trace(TraceLump, "storeclump exit %lld", a);
74 ia->blocks = (dsize + ClumpSize + (1 << ABlockLog) - 1) >> ABlockLog;
79 stats.clumpbwrites += size;
80 stats.clumpbcomp += dsize;
88 clumpmagic(Arena *arena, u64int aa)
92 if(readarena(arena, aa, buf, U32Size) == TWID32)
94 return unpackmagic(buf);
98 * fetch a block based at addr.
99 * score is filled in with the block's score.
100 * blocks is roughly the length of the clump on disk;
101 * if zero, the length is unknown.
104 loadclump(Arena *arena, u64int aa, int blocks, Clump *cl, u8int *score, int verify)
108 u8int bh[VtScoreSize], *buf;
115 qunlock(&stats.lock);
121 trace(TraceLump, "loadclump enter");
123 cb = alloczblock(blocks << ABlockLog, 0, 0);
126 n = readarena(arena, aa, cb->data, blocks << ABlockLog);
129 seterr(ECorrupt, "loadclump read less than a header");
133 trace(TraceLump, "loadclump unpack");
134 if(unpackclump(cl, cb->data, arena->clumpmagic) < 0){
135 seterr(ECorrupt, "loadclump %s %llud: %r", arena->name, aa);
139 if(cl->info.type == VtCorruptType){
140 seterr(EOk, "clump is marked corrupt");
145 if(n < cl->info.size){
148 cb = alloczblock(n, 0, 0);
151 if(readarena(arena, aa + ClumpSize, cb->data, n) != n){
152 seterr(ECorrupt, "loadclump read too little data");
158 buf = cb->data + ClumpSize;
160 scorecp(score, cl->info.score);
162 zb = alloczblock(cl->info.uncsize, 0, 0);
167 switch(cl->encoding){
169 trace(TraceLump, "loadclump decompress");
171 nunc = unwhack(&uw, zb->data, cl->info.uncsize, buf, cl->info.size);
172 if(nunc != cl->info.uncsize){
174 seterr(ECorrupt, "decompression of %llud failed: %s", aa, uw.err);
176 seterr(ECorrupt, "decompression of %llud gave partial block: %d/%d\n", aa, nunc, cl->info.uncsize);
183 if(cl->info.size != cl->info.uncsize){
184 seterr(ECorrupt, "loading clump: bad uncompressed size for uncompressed block %llud", aa);
189 scoremem(bh, buf, cl->info.uncsize);
190 if(scorecmp(cl->info.score, bh) != 0)
191 seterr(ECorrupt, "pre-copy sha1 wrong at %s %llud: expected=%V got=%V", arena->name, aa, cl->info.score, bh);
192 memmove(zb->data, buf, cl->info.uncsize);
195 seterr(ECorrupt, "unknown encoding in loadlump %llud", aa);
203 trace(TraceLump, "loadclump verify");
204 scoremem(bh, zb->data, cl->info.uncsize);
205 if(scorecmp(cl->info.score, bh) != 0){
206 seterr(ECorrupt, "loading clump: corrupted at %s %llud; expected=%V got=%V", arena->name, aa, cl->info.score, bh);
210 if(vttypevalid(cl->info.type) < 0){
211 seterr(ECorrupt, "loading lump at %s %llud: invalid lump type %d", arena->name, aa, cl->info.type);
217 trace(TraceLump, "loadclump exit");
220 stats.clumpbreads += cl->info.size;
221 stats.clumpbuncomp += cl->info.uncsize;
222 qunlock(&stats.lock);