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SubjectRe: [PATCH] blk queue io tracing support
Nathan Scott writes:
> Hi there,
>
> On Wed, Aug 31, 2005 at 09:48:23AM +1000, Nathan Scott wrote:
> > ...
> > # find /relay
> > /relay
> > /relay/block
> > /relay/block/sdd
> > /relay/block/sdd/trace3
> > /relay/block/sdd/trace2
> > /relay/block/sdd/trace1
> > /relay/block/sdd/trace0
> > /relay/block/sdb
> > /relay/block/sdb/trace3
> > /relay/block/sdb/trace2
> > /relay/block/sdb/trace1
> > /relay/block/sdb/trace0
> >
> > and does the correct dynamic setup and teardown of the hierarchy
> > as the userspace tool starts and stops tracing. I had to modify
> > the relayfs rmdir code a bit to make this work properly, I'll
> > send a separate patch for that shortly.
>
> Here it is. The problem was that relayfs is allowing a directory
> with children to be removed rather than returning -ENOTEMPTY. It
> looks like this can be resolved by splitting the shared relayfs
> unlink code (which is using simple_unlink) into separate file/dir
> variants, one using simple_unlink, the other using simple_rmdir.
>

Hi,

You're right, it should be using simple_rmdir rather than
simple_unlink for removing directories. Thanks for sending the patch,
which I've modified a bit to avoid splitting the rmdir/unlink cases
into separate functions, since they're almost the same except for what
they end up calling. relayfs_remove_dir now doesn't do anything but
call relayfs_remove (it didn't do much more than that before anyway),
but it makes sense to me to keep it, as the counterpart to
relayfs_create_dir. Let me know if you see any problems with it.

Thanks,

Tom

--- inode.c~ 2005-08-31 04:08:07.000000000 -0500
+++ inode.c 2005-08-31 03:44:40.000000000 -0500
@@ -189,26 +189,39 @@ struct dentry *relayfs_create_dir(const
/**
* relayfs_remove - remove a file or directory in the relay filesystem
* @dentry: file or directory dentry
+ *
+ * Returns 0 if successful, negative otherwise.
*/
int relayfs_remove(struct dentry *dentry)
{
- struct dentry *parent = dentry->d_parent;
+ struct dentry *parent;
+ int error = 0;
+
+ if (!dentry)
+ return -EINVAL;
+ parent = dentry->d_parent;
if (!parent)
return -EINVAL;

parent = dget(parent);
down(&parent->d_inode->i_sem);
if (dentry->d_inode) {
- simple_unlink(parent->d_inode, dentry);
- d_delete(dentry);
+ if (S_ISDIR(dentry->d_inode->i_mode))
+ error = simple_rmdir(parent->d_inode, dentry);
+ else
+ error = simple_unlink(parent->d_inode, dentry);
+ if (!error)
+ d_delete(dentry);
}
- dput(dentry);
+ if (!error)
+ dput(dentry);
up(&parent->d_inode->i_sem);
dput(parent);

- simple_release_fs(&relayfs_mount, &relayfs_mount_count);
+ if (!error)
+ simple_release_fs(&relayfs_mount, &relayfs_mount_count);

- return 0;
+ return error;
}

/**
@@ -219,9 +232,6 @@ int relayfs_remove(struct dentry *dentry
*/
int relayfs_remove_dir(struct dentry *dentry)
{
- if (!dentry)
- return -EINVAL;
-
return relayfs_remove(dentry);
}


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