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New ef_truncate()

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This commit is contained in:
Markus Armbruster 2008-03-09 13:42:12 +01:00
parent 3c5fa553bb
commit cf16c74a3d
2 changed files with 44 additions and 0 deletions
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43
src/lib/common/file.c
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@ -514,6 +514,49 @@ do_blank(struct empfile *ep, void *buf, int id, int count)
}
}
/*
* Truncate table TYPE to COUNT elements.
* Any pointers obtained from ef_ptr() become invalid.
* Return non-zero on success, zero on failure.
*/
int
ef_truncate(int type, int count)
{
struct empfile *ep;
if (ef_check(type) < 0)
return 0;
ep = &empfile[type];
if (CANT_HAPPEN(count < 0 || count > ep->fids))
return 0;
if (ep->fd >= 0 && !(ep->flags & EFF_PRIVATE)) {
if (ftruncate(ep->fd, count * ep->size) < 0) {
logerror("Can't truncate %s to %d elements (%s)",
ep->file, count, strerror(errno));
return 0;
}
}
ep->fids = count;
if (ep->flags & EFF_MEM) {
if (!(ep->flags & EFF_STATIC)) {
if (!ef_realloc_cache(ep, count)) {
logerror("Can't shrink cache after truncate");
/* continue with unshrunk cache */
}
}
ep->cids = count;
} else {
if (ep->baseid >= count)
ep->cids = 0;
else if (ep->cids > count - ep->baseid)
ep->cids = count - ep->baseid;
}
return 1;
}
struct castr *
ef_cadef(int type)
{