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9p: unify paths in v9fs_vfs_lookup()

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2018-05-14 19:24:48 -04:00
parent 1c5fedbb50
commit 500e2ab6c3
1 changed files with 15 additions and 20 deletions
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35
fs/9p/vfs_inode.c
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@ -823,28 +823,21 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
if (IS_ERR(dfid))
return ERR_CAST(dfid);
name = dentry->d_name.name;
fid = p9_client_walk(dfid, 1, &name, 1);
if (IS_ERR(fid)) {
if (fid == ERR_PTR(-ENOENT)) {
d_add(dentry, NULL);
return NULL;
}
return ERR_CAST(fid);
}
/*
* Make sure we don't use a wrong inode due to parallel
* unlink. For cached mode create calls request for new
* inode. But with cache disabled, lookup should do this.
*/
if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
name = dentry->d_name.name;
fid = p9_client_walk(dfid, 1, &name, 1);
if (fid == ERR_PTR(-ENOENT))
inode = NULL;
else if (IS_ERR(fid))
inode = ERR_CAST(fid);
else if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
else
inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
if (IS_ERR(inode)) {
p9_client_clunk(fid);
return ERR_CAST(inode);
}
/*
* If we had a rename on the server and a parallel lookup
* for the new name, then make sure we instantiate with
@ -853,12 +846,14 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
* k/b.
*/
res = d_splice_alias(inode, dentry);
if (!res)
v9fs_fid_add(dentry, fid);
else if (!IS_ERR(res))
v9fs_fid_add(res, fid);
else
p9_client_clunk(fid);
if (!IS_ERR(fid)) {
if (!res)
v9fs_fid_add(dentry, fid);
else if (!IS_ERR(res))
v9fs_fid_add(res, fid);
else
p9_client_clunk(fid);
}
return res;
}