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From: Justin Pryzby <[email protected]>
To: Andres Freund <[email protected]>
Cc: [email protected]
Cc: Robert Haas <[email protected]>
Cc: Thomas Munro <[email protected]>
Subject: Re: wrong fds used for refilenodes after pg_upgrade relfilenode changes Reply-To:
Date: Wed, 9 Feb 2022 16:42:30 -0600
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

On Wed, Feb 09, 2022 at 02:00:04PM -0800, Andres Freund wrote:
> On linux we can do so by a) checking if readlink(/proc/self/fd/$fd) points to
> a filename ending in " (deleted)", b) doing fstat(fd) and checking if st_nlink
> == 0.

You could also stat() the file in proc/self/fd/N and compare st_ino.  It
"looks" like a symlink (in which case that wouldn't work) but it's actually a
Very Special File.  You can even recover deleted, still-opened files that way..

PS. I didn't know pg_upgrade knew about Reply-To ;)

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