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List:       fuse-devel
Subject:    Re: [fuse-devel] fuse seems to freeze on long operations
From:       Miklos Szeredi <miklos () szeredi ! hu>
Date:       2009-08-04 15:44:57
Message-ID: E1MYMC9-0004v8-KN () pomaz-ex ! szeredi ! hu
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On Fri, 31 Jul 2009, Bruno wrote:
> Hi guys,
>    I am working on a fuse filesystem which interact with a db I use to
> catalogue my Audio and Video files.
> I am using Debian etch with PostgreSQL 8.2.6 and kernel 2.6.24-1-amd64.
> I have noticed that when I execute a long running operation I cannot
> access the mounted filesystem using another shell.
> Maybe I am missing something. I did not find anything about the issue
> I have, can you please help me?

This is caused by the locking necessary for accessing directories:
when a file or directory is removed then the kernel locks the parent
directory which is not accessible while the unlink/rmdir operation is
in progress.  Similar locking happens when creating a directory entry
as well.

The rest of the filesystem is unaffected, however, so this only blocks
operations on or immediately below the parent directory.

Thanks,
Miklos

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