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exportfs: clear DISCONNECTED on all parents sooner 

Once we've found any connected parent, we know all our parents are
connected--that's true even if there's a concurrent rename.  May as well
clear them all at once and be done with it.

Reviewed-by: Cristoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
J. Bruce Fields 2013-09-09 16:15:13 -04:00 committed by Al Viro
parent 78cee9a8e4
commit 0dbc018a49
1 changed files with 21 additions and 4 deletions
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25
fs/exportfs/expfs.c
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@ -90,6 +90,24 @@ find_disconnected_root(struct dentry *dentry)
return dentry;
}
static void clear_disconnected(struct dentry *dentry)
{
dget(dentry);
while (dentry->d_flags & DCACHE_DISCONNECTED) {
struct dentry *parent = dget_parent(dentry);
WARN_ON_ONCE(IS_ROOT(dentry));
spin_lock(&dentry->d_lock);
dentry->d_flags &= ~DCACHE_DISCONNECTED;
spin_unlock(&dentry->d_lock);
dput(dentry);
dentry = parent;
}
dput(dentry);
}
/*
* Make sure target_dir is fully connected to the dentry tree.
*
@ -128,10 +146,9 @@ reconnect_path(struct vfsmount *mnt, struct dentry *target_dir, char *nbuf)
if (!IS_ROOT(pd)) {
/* must have found a connected parent - great */
spin_lock(&pd->d_lock);
pd->d_flags &= ~DCACHE_DISCONNECTED;
spin_unlock(&pd->d_lock);
noprogress = 0;
clear_disconnected(target_dir);
dput(pd);
break;
} else {
/*
* We have hit the top of a disconnected path, try to