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Don't forget about failed fsync() requests.
If fsync() fails, md.c must keep the request in its bitmap, so that future attempts will try again. Back-patch to all supported releases. Author: Thomas Munro Reviewed-by: Amit Kapila Reported-by: Andrew Gierth Discussion: https://postgr.es/m/87y3i1ia4w.fsf%40news-spur.riddles.org.uk
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@ -1148,10 +1148,8 @@ mdsync(void)
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* The bitmap manipulations are slightly tricky, because we can call
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* AbsorbFsyncRequests() inside the loop and that could result in
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* bms_add_member() modifying and even re-palloc'ing the bitmapsets.
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* This is okay because we unlink each bitmapset from the hashtable
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* entry before scanning it. That means that any incoming fsync
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* requests will be processed now if they reach the table before we
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* begin to scan their fork.
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* So we detach it, but if we fail we'll merge it with any new
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* requests that have arrived in the meantime.
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*/
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for (forknum = 0; forknum <= MAX_FORKNUM; forknum++)
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{
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@ -1161,7 +1159,8 @@ mdsync(void)
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entry->requests[forknum] = NULL;
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entry->canceled[forknum] = false;
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while ((segno = bms_first_member(requests)) >= 0)
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segno = -1;
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while ((segno = bms_next_member(requests, segno)) >= 0)
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{
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int failures;
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@ -1242,6 +1241,7 @@ mdsync(void)
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longest = elapsed;
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total_elapsed += elapsed;
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processed++;
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requests = bms_del_member(requests, segno);
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if (log_checkpoints)
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elog(DEBUG1, "checkpoint sync: number=%d file=%s time=%.3f msec",
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processed,
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@ -1270,10 +1270,23 @@ mdsync(void)
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*/
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if (!FILE_POSSIBLY_DELETED(errno) ||
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failures > 0)
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{
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Bitmapset *new_requests;
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/*
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* We need to merge these unsatisfied requests with
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* any others that have arrived since we started.
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*/
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new_requests = entry->requests[forknum];
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entry->requests[forknum] =
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bms_join(new_requests, requests);
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errno = save_errno;
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ereport(ERROR,
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(errcode_for_file_access(),
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errmsg("could not fsync file \"%s\": %m",
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path)));
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}
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else
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ereport(DEBUG1,
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(errcode_for_file_access(),
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