Commit c180eebe authored by Miklos Szeredi's avatar Miklos Szeredi Committed by Linus Torvalds
Browse files

fuse: add fuse_lookup_name() helper



Add a new helper function which sends a LOOKUP request with the supplied
name.  This will be used by the next patch to send special LOOKUP requests
with "." and ".." as the name.
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent dbd561d2
......@@ -112,18 +112,16 @@ static void fuse_invalidate_entry(struct dentry *entry)
fuse_invalidate_entry_cache(entry);
}
static void fuse_lookup_init(struct fuse_req *req, struct inode *dir,
struct dentry *entry,
static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req,
u64 nodeid, struct qstr *name,
struct fuse_entry_out *outarg)
{
struct fuse_conn *fc = get_fuse_conn(dir);
memset(outarg, 0, sizeof(struct fuse_entry_out));
req->in.h.opcode = FUSE_LOOKUP;
req->in.h.nodeid = get_node_id(dir);
req->in.h.nodeid = nodeid;
req->in.numargs = 1;
req->in.args[0].size = entry->d_name.len + 1;
req->in.args[0].value = entry->d_name.name;
req->in.args[0].size = name->len + 1;
req->in.args[0].value = name->name;
req->out.numargs = 1;
if (fc->minor < 9)
req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
......@@ -189,7 +187,8 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
attr_version = fuse_get_attr_version(fc);
parent = dget_parent(entry);
fuse_lookup_init(req, parent->d_inode, entry, &outarg);
fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
&entry->d_name, &outarg);
request_send(fc, req);
dput(parent);
err = req->out.h.error;
......@@ -255,73 +254,111 @@ static struct dentry *fuse_d_add_directory(struct dentry *entry,
return d_splice_alias(inode, entry);
}
static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
struct nameidata *nd)
int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
struct fuse_entry_out *outarg, struct inode **inode)
{
int err;
struct fuse_entry_out outarg;
struct inode *inode = NULL;
struct dentry *newent;
struct fuse_conn *fc = get_fuse_conn(dir);
struct fuse_conn *fc = get_fuse_conn_super(sb);
struct fuse_req *req;
struct fuse_req *forget_req;
u64 attr_version;
int err;
if (entry->d_name.len > FUSE_NAME_MAX)
return ERR_PTR(-ENAMETOOLONG);
*inode = NULL;
err = -ENAMETOOLONG;
if (name->len > FUSE_NAME_MAX)
goto out;
req = fuse_get_req(fc);
err = PTR_ERR(req);
if (IS_ERR(req))
return ERR_CAST(req);
goto out;
forget_req = fuse_get_req(fc);
err = PTR_ERR(forget_req);
if (IS_ERR(forget_req)) {
fuse_put_request(fc, req);
return ERR_CAST(forget_req);
goto out;
}
attr_version = fuse_get_attr_version(fc);
fuse_lookup_init(req, dir, entry, &outarg);
fuse_lookup_init(fc, req, nodeid, name, outarg);
request_send(fc, req);
err = req->out.h.error;
fuse_put_request(fc, req);
/* Zero nodeid is same as -ENOENT, but with valid timeout */
if (!err && outarg.nodeid &&
(invalid_nodeid(outarg.nodeid) ||
!fuse_valid_type(outarg.attr.mode)))
err = -EIO;
if (!err && outarg.nodeid) {
inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
&outarg.attr, entry_attr_timeout(&outarg),
attr_version);
if (!inode) {
fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
return ERR_PTR(-ENOMEM);
}
if (err || !outarg->nodeid)
goto out_put_forget;
err = -EIO;
if (!outarg->nodeid)
goto out_put_forget;
if (!fuse_valid_type(outarg->attr.mode))
goto out_put_forget;
*inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
&outarg->attr, entry_attr_timeout(outarg),
attr_version);
err = -ENOMEM;
if (!*inode) {
fuse_send_forget(fc, forget_req, outarg->nodeid, 1);
goto out;
}
err = 0;
out_put_forget:
fuse_put_request(fc, forget_req);
if (err && err != -ENOENT)
return ERR_PTR(err);
out:
return err;
}
static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
struct nameidata *nd)
{
int err;
struct fuse_entry_out outarg;
struct inode *inode;
struct dentry *newent;
struct fuse_conn *fc = get_fuse_conn(dir);
bool outarg_valid = true;
err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
&outarg, &inode);
if (err == -ENOENT) {
outarg_valid = false;
err = 0;
}
if (err)
goto out_err;
err = -EIO;
if (inode && get_node_id(inode) == FUSE_ROOT_ID)
goto out_iput;
if (inode && S_ISDIR(inode->i_mode)) {
mutex_lock(&fc->inst_mutex);
newent = fuse_d_add_directory(entry, inode);
mutex_unlock(&fc->inst_mutex);
if (IS_ERR(newent)) {
iput(inode);
return newent;
}
} else
err = PTR_ERR(newent);
if (IS_ERR(newent))
goto out_iput;
} else {
newent = d_splice_alias(inode, entry);
}
entry = newent ? newent : entry;
entry->d_op = &fuse_dentry_operations;
if (!err)
if (outarg_valid)
fuse_change_entry_timeout(entry, &outarg);
else
fuse_invalidate_entry_cache(entry);
return newent;
out_iput:
iput(inode);
out_err:
return ERR_PTR(err);
}
/*
......
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