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d_add_ci() should just accept a hashed exact match if it finds one

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-10-12 18:46:26 -04:00
parent ca5358ef75
commit 427c77d461
1 changed files with 7 additions and 39 deletions
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46
fs/dcache.c
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@ -1888,51 +1888,19 @@ struct dentry *d_add_ci(struct dentry *dentry, struct inode *inode,
* if not go ahead and create it now.
*/
found = d_hash_and_lookup(dentry->d_parent, name);
if (unlikely(IS_ERR(found)))
goto err_out;
if (!found) {
new = d_alloc(dentry->d_parent, name);
if (!new) {
found = ERR_PTR(-ENOMEM);
goto err_out;
} else {
found = d_splice_alias(inode, new);
if (found) {
dput(new);
return found;
}
return new;
}
found = d_splice_alias(inode, new);
if (found) {
dput(new);
return found;
}
return new;
}
/*
* If a matching dentry exists, and it's not negative use it.
*
* Decrement the reference count to balance the iget() done
* earlier on.
*/
if (found->d_inode) {
if (unlikely(found->d_inode != inode)) {
/* This can't happen because bad inodes are unhashed. */
BUG_ON(!is_bad_inode(inode));
BUG_ON(!is_bad_inode(found->d_inode));
}
iput(inode);
return found;
}
/*
* Negative dentry: instantiate it unless the inode is a directory and
* already has a dentry.
*/
new = d_splice_alias(inode, found);
if (new) {
dput(found);
found = new;
}
return found;
err_out:
iput(inode);
return found;
}