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Use a fd opened for read/write when syncing slots during startup, take 2.

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Cribbing from dfbaed4597:
    Some operating systems, including the reporter's windows, return EBADFD
    or similar when fsync() is invoked on a O_RDONLY file descriptor.
    Unfortunately RestoreSlotFromDisk() does exactly that; which causes
    failures after restarts in at least some scenarios.

    If you hit the bug the error message will be something like
    ERROR: could not fsync file "pg_replslot/$name/state": Bad file descriptor

    Simply use O_RDWR instead of O_RDONLY when opening the relevant file
    descriptor to fix the bug.

Unfortunately this fix was undone in 82a5649fb9. Re-apply, and add a
comment.

Bug: 16039
Reported-By: Hans Buschmann
Author: Andres Freund
Discussion: https://postgr.es/m/16039-196fc97cc05e141c@postgresql.org
Backpatch: 12-, as 82a5649fb9
This commit is contained in:
Andres Freund 2019-10-04 13:08:51 -07:00
parent ad7595b890
commit a586cc4b6c
1 changed files with 2 additions and 1 deletions
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3
src/backend/replication/slot.c
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@ -1386,7 +1386,8 @@ RestoreSlotFromDisk(const char *name)
elog(DEBUG1, "restoring replication slot from \"%s\"", path);
fd = OpenTransientFile(path, O_RDONLY | PG_BINARY);
/* on some operating systems fsyncing a file requires O_RDWR */
fd = OpenTransientFile(path, O_RDWR | PG_BINARY);
/*
* We do not need to handle this as we are rename()ing the directory into