From: Christoph Hellwig <hch@infradead.org>
To: Felix Janda <felix.janda@posteo.de>
Cc: Christoph Hellwig <hch@infradead.org>, xfs@oss.sgi.com
Subject: Re: [PATCH 2/6] libxfs/linux.c: Replace use of ustat by stat
Date: Thu, 14 Jan 2016 02:20:09 -0800 [thread overview]
Message-ID: <20160114102009.GD27644@infradead.org> (raw)
In-Reply-To: <20160113174241.GC10942@nyan>
On Wed, Jan 13, 2016 at 06:42:41PM +0100, Felix Janda wrote:
> Is this really performance relevant?
I'm not entirely sure. There are systems with giant amounts of mounted
file systems, in which case iterating each of them and requiring
multiple syscalls each might not be a good idea.
> Hmm, so we couldn't we use for linux just something like
>
> int
> platform_check_ismounted(char *name, char *block, struct stat64 *s, int verbose)
> {
> int fd = open(block, O_EXCL);
> int e = errno;
>
> if (fd != -1) close(fd);
> if (e == EBUSY) {
> if (verbose)
> fprintf(stderr, _("%s: %s contains a mounted filesystem\n"), progname, name);
> return 1;
> }
>
> return 0;
Please give me a couple of days to come up with an idea to use O_EXCL
on Linux and work around it on other platforms in a more integrated way.
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next prev parent reply other threads:[~2016-01-14 10:20 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1452627740.git.felix.janda@posteo.de>
2016-01-12 19:59 ` [PATCH 1/6] Move from __uint*_t types to uint*_t and likewise for __int*_t Felix Janda
2016-01-12 21:24 ` Dave Chinner
2016-01-12 21:46 ` Felix Janda
2016-01-12 22:02 ` Dave Chinner
2016-01-13 7:48 ` Christoph Hellwig
2016-01-20 0:46 ` Dave Chinner
2016-01-12 19:59 ` [PATCH 2/6] libxfs/linux.c: Replace use of ustat by stat Felix Janda
2016-01-12 21:24 ` Dave Chinner
2016-01-12 21:33 ` Felix Janda
2016-01-13 7:55 ` Christoph Hellwig
2016-01-13 17:42 ` Felix Janda
2016-01-14 10:20 ` Christoph Hellwig [this message]
2016-01-14 19:07 ` Felix Janda
2016-06-18 14:53 ` Felix Janda
2016-06-22 12:59 ` Christoph Hellwig
2016-09-04 1:23 ` Eric Sandeen
2016-09-08 0:00 ` Dave Chinner
2016-01-12 19:59 ` [PATCH 3/6] fsr/xfs_fsr.c: Include <paths.h> for _PATH_MOUNTED Felix Janda
2016-01-13 7:55 ` Christoph Hellwig
2016-01-12 20:00 ` [PATCH 4/6] linux.h: Use off64_t instead of loff_t Felix Janda
2016-01-13 7:55 ` Christoph Hellwig
2016-01-12 20:00 ` [PATCH 5/6] include/linux.h: Include <stdio.h> for fprintf and stderr Felix Janda
2016-01-13 7:55 ` Christoph Hellwig
2016-01-12 20:00 ` [PATCH 6/6] Add configure check for members of dirent for use in io/readdir.c Felix Janda
2016-01-12 21:30 ` Dave Chinner
2016-01-12 21:37 ` Felix Janda
2016-01-12 22:37 ` Dave Chinner
2016-01-13 7:58 ` Christoph Hellwig
2016-01-13 17:09 ` Felix Janda
2016-01-14 10:17 ` Christoph Hellwig
2016-01-14 19:06 ` Felix Janda
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