--Multipart_Sat_Aug_23_23:04:41_1997-1
Content-Type: text/plain; charset=US-ASCII
> 'inode->i_op->unlink()':
> - look at "dentry->d_count": if it is > 1 we need to sillyrename,
> because somebody has the file open still so we can't delete it
> at the server.
> - if dentry->d_count == 1, delete the file.
>
> 'dentry->d_op->delete()':
> - look if we are silly-renamed (use "dentry->d_flag" for this, it's
> usable for filesystem specific things). If so, do the actual NFS
> server delete.
>
I think the following patch should be acceptable. It doesn't use the
inode stuff any longer (well, the temp files still have the hex
representation of i_ino as a part of their name, but that's cosmetic; it
doesn't break the code to simply delete the two lines that are
responsible for this).
Instead, it uses the dcache stuff only:
a "silly renamed" file is created if "d_count > 1". A flag
"DCACHE_NFSFS_RENAMED" is set in dentry->d_flags to mark this dentry
as being renamed. The name of the "silly" file is
".nfs#i_ino#jiffies"
where "#i_ino" is the hex representation of
dentry->d_inode->i_ino. This can be deleted. It is here for cosmetic
reasons ONLY.
The #jiffies refers to the hex representation of the value that
"jiffies" had at the time the temp file was created. Ok, that name
isn't really unique, but: if we really should step into the unlikely
case that there already exists such a file, then the "sillyrename()"
function simply retries: it calls nfs_lookup() which definitely will
sleep for some jiffies and tries to create a new temp name with the
new jiffies value.
This should be safe enough.
This second attempt of mine to re-implement the sillyrename() stuff
for 2.1.* fixes a serious bug in my previous patch:
The previous patch did NOT compute the hash value of the renamed
file. This was evil as this resulted in cached lookups to fail; and
into allocation of new dentry instances for the already existing
dentry of the renamed file. I struggled quite a while to figure out
why the "dentry->d_count > 1" check seemed to be broken. But that was
the reason.
In order to remove the "silly renamed" files after the last
application has closed its file descriptor a new component
"dentry->d_op->d_delete" has been introduced. This follows a
suggestion by Linus and, hey, this was a pretty good idea. Thanks
Linus!
The new "d_delete" function is called by dput() when the d_count
reaches zero. It is called before doing any other stuff (i.e. before
the d_inode is being iput()) and thus can be used perfectly to delete
those "silly" ".nfs..." files.
I have deleted the now unnecessary components in the nfs inode struct
that were needed for the 2.0.* silly rename stuff. We really don't
need to fiddle with the inode code any more for silly rename.
Also, there is no need to remove the silly renamed file from the hash
queues of their parent dirs any more. Doing that would be even evil.
My current implementation still denies removal or renaming of those
special "silly renamed" files, returning an -EBUSY error. This could
be changed. But I regard this rather as a feature than a bug.
One last remark: the inode based implementation of the silly rename
feature needs at most one ".nfs..." temp file for each directory for a
given inode. The dcache based implementation creates a new ".nfs..."
temp file whenever a busy file (i.e. d_count > 1) is unlinked or moved
to another directory. While this creates more links and name instances
of the same inode, it isn't worth the effort to eliminate those
"extra" name-instances of those "silly" inodes. IMHO.
Cheers
Claus
--Multipart_Sat_Aug_23_23:04:41_1997-1
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--Multipart_Sat_Aug_23_23:04:41_1997-1
Content-Type: text/plain; charset=US-ASCII
Claus-Justus Heine
claus@momo.math.rwth-aachen.de
http://samuel.math.rwth-aachen.de/~LBFM/claus
PGP Public Key:
http://samuel.math.rwth-aachen.de/~LBFM/claus/claus-public-key.asc
Ftape - the Linux Floppy Tape Project
WWW : http://samuel.math.rwth-aachen.de/~LBFM/claus/ftape
Mailing-list: linux-tape@vger.rutgers.edu
--Multipart_Sat_Aug_23_23:04:41_1997-1--
--pgp-sign-Multipart_Sat_Aug_23_23:04:41_1997-1
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Content-Transfer-Encoding: 7bit
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Version: 2.6.3i
Comment: Processed by Mailcrypt 3.4, an Emacs/PGP interface
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--pgp-sign-Multipart_Sat_Aug_23_23:04:41_1997-1--