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silly cache hack, also fix vtfilewritebefore not to be so aggressive.

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This commit is contained in:
rsc 2004-06-17 19:17:04 +00:00
parent 7cb748941e
commit a1882dc1d0
2 changed files with 25 additions and 6 deletions
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20
src/libventi/cache.c
View file

@ -39,6 +39,7 @@ struct VtCache
int nblock;
uchar *mem; /* memory for all blocks and data */
int mode;
int (*write)(VtConn*, uchar[VtScoreSize], uint, uchar*, int);
};
static void cachecheck(VtCache*);
@ -56,13 +57,13 @@ vtcachealloc(VtConn *z, int blocksize, ulong nblock, int mode)
c->z = z;
c->blocksize = (blocksize + 127) & ~127;
c->nblock = nblock;
c->nhash = nblock;
c->hash = vtmallocz(nblock*sizeof(VtBlock*));
c->heap = vtmallocz(nblock*sizeof(VtBlock*));
c->block = vtmallocz(nblock*sizeof(VtBlock));
c->mem = vtmallocz(nblock*c->blocksize);
c->mode = mode;
c->write = vtwrite;
p = c->mem;
for(i=0; i<nblock; i++){
@ -79,6 +80,19 @@ vtcachealloc(VtConn *z, int blocksize, ulong nblock, int mode)
return c;
}
/*
* BUG This is here so that vbackup can override it and do some
* pipelining of writes. Arguably vtwrite or vtwritepacket or the
* cache itself should be providing this functionality.
*/
void
vtcachesetwrite(VtCache *c, int (*write)(VtConn*, uchar[VtScoreSize], uint, uchar*, int))
{
if(write == nil)
write = vtwrite;
c->write = write;
}
void
vtcachefree(VtCache *c)
{
@ -405,6 +419,8 @@ vtcacheglobal(VtCache *c, uchar score[VtScoreSize], int type)
n = vtread(c->z, score, type, b->data, c->blocksize);
if(n < 0){
werrstr("vtread %V: %r", score);
abort();
b->iostate = BioVentiError;
vtblockput(b);
return nil;
@ -494,7 +510,7 @@ vtblockwrite(VtBlock *b)
c = b->c;
n = vtzerotruncate(b->type, b->data, c->blocksize);
if(vtwrite(c->z, score, b->type, b->data, n) < 0)
if(c->write(c->z, score, b->type, b->data, n) < 0)
return -1;
memmove(b->score, score, VtScoreSize);

11
src/libventi/file.c
View file

@ -1222,10 +1222,13 @@ vtfileflushbefore(VtFile *r, u64int offset)
* if the rest of the block is already flushed,
* we can flush the whole block.
*/
ok = 1;
for(; j<ppb; j++)
if(vtglobaltolocal(b->data+j*VtScoreSize) != NilBlock)
ok = 0;
ok = 0;
if(index[i] != index1[i]){
ok = 1;
for(; j<ppb; j++)
if(vtglobaltolocal(b->data+j*VtScoreSize) != NilBlock)
ok = 0;
}
}
if(ok){
if(i == depth)