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Diffstat (limited to 'src/backend/storage/smgr/md.c')
| -rw-r--r-- | src/backend/storage/smgr/md.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/backend/storage/smgr/md.c b/src/backend/storage/smgr/md.c index 5458cbdda42..c0e41c7053b 100644 --- a/src/backend/storage/smgr/md.c +++ b/src/backend/storage/smgr/md.c @@ -33,7 +33,13 @@ /* interval for calling AbsorbFsyncRequests in mdsync */ #define FSYNCS_PER_ABSORB 10 -/* special values for the segno arg to RememberFsyncRequest */ +/* + * Special values for the segno arg to RememberFsyncRequest. + * + * Note that CompactBgwriterRequestQueue assumes that it's OK to remove an + * fsync request from the queue if an identical, subsequent request is found. + * See comments there before making changes here. + */ #define FORGET_RELATION_FSYNC (InvalidBlockNumber) #define FORGET_DATABASE_FSYNC (InvalidBlockNumber-1) #define UNLINK_RELATION_REQUEST (InvalidBlockNumber-2) |