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Fix unitialized variables 

As complained by clang, reported by Andres Freund.  Brown paper bag bug
in ccc4c07499.

Add some comments, too.

Backpatch to 9.5, like that one.
This commit is contained in:
Alvaro Herrera 2015-08-13 00:12:07 -03:00
parent cfe30a72fa
commit fcbf455842
1 changed files with 10 additions and 3 deletions
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13
src/backend/access/brin/brin_pageops.c
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@ -86,6 +86,7 @@ brin_doupdate(Relation idxrel, BlockNumber pagesPerRange,
{
LockBuffer(oldbuf, BUFFER_LOCK_EXCLUSIVE);
newbuf = InvalidBuffer;
extended = false;
}
oldpage = BufferGetPage(oldbuf);
oldlp = PageGetItemId(oldpage, oldoff);
@ -335,9 +336,8 @@ brin_doinsert(Relation idxrel, BlockNumber pagesPerRange,
brinRevmapExtend(revmap, heapBlk);
/*
* Obtain a locked buffer to insert the new tuple. Note
* brin_getinsertbuffer ensures there's enough space in the returned
* buffer.
* Acquire lock on buffer supplied by caller, if any. If it doesn't have
* enough space, unpin it to obtain a new one below.
*/
if (BufferIsValid(*buffer))
{
@ -354,12 +354,18 @@ brin_doinsert(Relation idxrel, BlockNumber pagesPerRange,
}
}
/*
* If we still don't have a usable buffer, have brin_getinsertbuffer
* obtain one for us.
*/
if (!BufferIsValid(*buffer))
{
*buffer = brin_getinsertbuffer(idxrel, InvalidBuffer, itemsz, &extended);
Assert(BufferIsValid(*buffer));
Assert(extended || br_page_get_freespace(BufferGetPage(*buffer)) >= itemsz);
}
else
extended = false;
/* Now obtain lock on revmap buffer */
revmapbuf = brinLockRevmapPageForUpdate(revmap, heapBlk);
@ -367,6 +373,7 @@ brin_doinsert(Relation idxrel, BlockNumber pagesPerRange,
page = BufferGetPage(*buffer);
blk = BufferGetBlockNumber(*buffer);
/* Execute the actual insertion */
START_CRIT_SECTION();
if (extended)
brin_page_init(BufferGetPage(*buffer), BRIN_PAGETYPE_REGULAR);