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Better size arithmetic in Rhizome database cleanup code

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Fixes -Wsize-compare warnings
This commit is contained in:
Andrew Bettison 2013-12-10 17:24:14 +10:30
parent 8effa869a3
commit 608a705403
1 changed files with 5 additions and 3 deletions
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8
rhizome_database.c
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@ -1208,7 +1208,9 @@ int rhizome_cleanup(struct rhizome_cleanup_report *report)
int rhizome_make_space(int group_priority, uint64_t bytes)
{
/* Asked for impossibly large amount */
if (bytes>=(config.rhizome.database_size-65536))
const size_t margin = 65536;
const uint64_t limit = config.rhizome.database_size > margin ? config.rhizome.database_size - margin : 1;
if (bytes >= limit)
return WHYF("bytes=%"PRIu64" is too large", bytes);
int64_t db_used = rhizome_database_used_bytes();
@ -1218,7 +1220,7 @@ int rhizome_make_space(int group_priority, uint64_t bytes)
rhizome_cleanup(NULL);
/* If there is already enough space now, then do nothing more */
if (db_used<=(config.rhizome.database_size-bytes-65536))
if (db_used + bytes <= limit)
return 0;
/* Okay, not enough space, so free up some. */
@ -1228,7 +1230,7 @@ int rhizome_make_space(int group_priority, uint64_t bytes)
INT, group_priority, END);
if (!statement)
return -1;
while (bytes > (config.rhizome.database_size - 65536 - rhizome_database_used_bytes())
while (rhizome_database_used_bytes() + bytes > limit
&& sqlite_step_retry(&retry, statement) == SQLITE_ROW
) {
/* Make sure we can drop this blob, and if so drop it, and recalculate number of bytes required */