static int write_to_changed_file(struct asfd *asfd,
struct asfd *chfd, struct manios *manios,
struct slist *slist, int end_flags)
{
struct sbuf *sb;
if(!slist) return 0;
while((sb=slist->head))
{
if(sb->flags & SBUF_NEED_DATA)
{
switch(sbuf_needs_data(sb, asfd, chfd, manios, slist,
end_flags))
{
case 0: return 0;
case 1: continue;
default: return -1;
}
}
else
{
// No change, can go straight in.
if(manio_write_sbuf(manios->changed, sb)) return -1;
if(write_endfile(sb, manios)) return -1;
// Move along.
slist_advance(slist);
}
}
return 0;
}
static int sbuf_needs_data(struct sbuf *sb, struct asfd *asfd,
struct asfd *chfd, struct manios *manios,
struct slist *slist, int end_flags)
{
int ret=-1;
struct blk *blk;
static struct iobuf wbuf;
struct blist *blist=slist->blist;
if(!(sb->flags & SBUF_HEADER_WRITTEN_TO_MANIFEST))
{
if(manio_write_sbuf(manios->changed, sb)) goto end;
sb->flags |= SBUF_HEADER_WRITTEN_TO_MANIFEST;
}
while((blk=sb->protocol2->bstart)
&& blk->got==BLK_GOT
&& (blk->next || end_flags&END_BACKUP))
{
if(blk->got_save_path
&& !blk_is_zero_length(blk))
{
if(breaking && breakcount--==0)
{
breakpoint(breaking, __func__);
goto end;
}
if(manio_write_sig_and_path(manios->changed, blk))
goto end;
if(manios->changed->sig_count==0)
{
// Have finished a manifest file. Want to start
// using it as a dedup candidate now.
if(manio_component_to_chfd(chfd,
manios->changed->offset->ppath))
goto end;
if(!blk->requested)
{
// Also let the client know, so that it
// can free memory if there was a long
// consecutive number of unrequested
// blocks.
get_wbuf_from_index(&wbuf, blk->index);
if(asfd->write(asfd, &wbuf)) goto end;
}
}
}
if(blk==sb->protocol2->bend)
{
blist_adjust_head(blist, sb);
if(write_endfile(sb, manios)) return -1;
slist_advance(slist);
return 1;
}
if(sb->protocol2->bsighead==sb->protocol2->bstart)
sb->protocol2->bsighead=blk->next;
sb->protocol2->bstart=blk->next;
if(blk==blist->blk_from_champ_chooser)
blist->blk_from_champ_chooser=blk->next;
}
if(!blk && sb && !sb->protocol2->bend && (end_flags&END_BACKUP))
{
// Write endfile for the very last file.
if(write_endfile(sb, manios)) return -1;
}
ret=0;
end:
blist_adjust_head(blist, sb);
return ret;
}
static int sbuf_needs_data(struct sbuf *sb, struct asfd *asfd,
struct asfd *chfd, struct manios *manios,
struct slist *slist, int end_flags)
{
int ret=-1;
struct blk *blk;
static struct iobuf wbuf;
struct blist *blist=slist->blist;
static int unrequested=0;
if(!(sb->flags & SBUF_HEADER_WRITTEN_TO_MANIFEST))
{
if(manio_write_sbuf(manios->changed, sb)) goto end;
sb->flags |= SBUF_HEADER_WRITTEN_TO_MANIFEST;
}
while((blk=sb->protocol2->bstart)
&& blk->got==BLK_GOT
&& (blk->next || end_flags&END_BACKUP))
{
if(blk->got_save_path
&& !blk_is_zero_length(blk))
{
if(breaking && breakcount--==0)
{
breakpoint(breaking, __func__);
goto end;
}
if(manio_write_sig_and_path(manios->changed, blk))
goto end;
if(manios->changed->sig_count==0)
{
// Have finished a manifest file. Want to start
// using it as a dedup candidate now.
if(manio_component_to_chfd(chfd,
manios->changed->offset->ppath))
goto end;
// The champ chooser has the candidate. Now,
// empty our local hash table.
hash_delete_all();
// Add the most recent block, so identical
// adjacent blocks are deduplicated well.
if(hash_load_blk(blk))
goto end;
}
}
if(!blk->requested)
unrequested++;
if(unrequested>BLKS_MAX_UNREQUESTED)
{
unrequested=0;
// Let the client know that it can free memory if there
// was a long consecutive number of unrequested blocks.
get_wbuf_from_index(&wbuf, blk->index);
if(asfd->write(asfd, &wbuf))
goto end;
}
if(blk==sb->protocol2->bend)
{
blist_adjust_head(blist, sb);
if(write_endfile(sb, manios)) return -1;
slist_advance(slist);
return 1;
}
if(sb->protocol2->bsighead==sb->protocol2->bstart)
sb->protocol2->bsighead=blk->next;
sb->protocol2->bstart=blk->next;
if(blk==blist->blk_from_champ_chooser)
blist->blk_from_champ_chooser=blk->next;
}
if(!blk && sb && !sb->protocol2->bend && (end_flags&END_BACKUP))
{
// Write endfile for the very last file.
if(write_endfile(sb, manios)) return -1;
}
ret=0;
end:
blist_adjust_head(blist, sb);
return ret;
}
