9p: implement i_op->atomic_open()
Add an ->atomic_open implementation which replaces the atomic open+create
operation implemented via ->create. No functionality is changed.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
CC: Eric Van Hensbergen <ericvh@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index e3dd2a1..a354fe2 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -230,7 +230,6 @@
* @dir: directory inode that is being created
* @dentry: dentry that is being deleted
* @mode: create permissions
- * @nd: path information
*
*/
@@ -238,9 +237,16 @@
v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
struct nameidata *nd)
{
+ return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
+}
+
+static struct file *
+v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
+ struct opendata *od, unsigned flags, umode_t omode,
+ bool *created)
+{
int err = 0;
gid_t gid;
- int flags;
umode_t mode;
char *name = NULL;
struct file *filp;
@@ -251,18 +257,24 @@
struct p9_fid *dfid, *ofid, *inode_fid;
struct v9fs_session_info *v9ses;
struct posix_acl *pacl = NULL, *dacl = NULL;
+ struct dentry *res = NULL;
+
+ if (d_unhashed(dentry)) {
+ res = v9fs_vfs_lookup(dir, dentry, NULL);
+ if (IS_ERR(res))
+ return ERR_CAST(res);
+
+ if (res)
+ dentry = res;
+ }
+
+ /* Only creates */
+ if (!(flags & O_CREAT) || dentry->d_inode) {
+ finish_no_open(od, res);
+ return NULL;
+ }
v9ses = v9fs_inode2v9ses(dir);
- if (nd)
- flags = nd->intent.open.flags;
- else {
- /*
- * create call without LOOKUP_OPEN is due
- * to mknod of regular files. So use mknod
- * operation.
- */
- return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
- }
name = (char *) dentry->d_name.name;
p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
@@ -272,7 +284,7 @@
if (IS_ERR(dfid)) {
err = PTR_ERR(dfid);
p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
- return err;
+ goto err_return;
}
/* clone a fid to use for creation */
@@ -280,7 +292,7 @@
if (IS_ERR(ofid)) {
err = PTR_ERR(ofid);
p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
- return err;
+ goto err_return;
}
gid = v9fs_get_fsgid_for_create(dir);
@@ -345,7 +357,7 @@
}
mutex_unlock(&v9inode->v_mutex);
/* Since we are opening a file, assign the open fid to the file */
- filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
+ filp = finish_open(od, dentry, generic_file_open);
if (IS_ERR(filp)) {
err = PTR_ERR(filp);
goto err_clunk_old_fid;
@@ -355,7 +367,10 @@
if (v9ses->cache)
v9fs_cache_inode_set_cookie(inode, filp);
#endif
- return 0;
+ *created = true;
+out:
+ dput(res);
+ return filp;
error:
if (fid)
@@ -364,7 +379,9 @@
if (ofid)
p9_client_clunk(ofid);
v9fs_set_create_acl(NULL, &dacl, &pacl);
- return err;
+err_return:
+ filp = ERR_PTR(err);
+ goto out;
}
/**
@@ -982,6 +999,7 @@
const struct inode_operations v9fs_dir_inode_operations_dotl = {
.create = v9fs_vfs_create_dotl,
+ .atomic_open = v9fs_vfs_atomic_open_dotl,
.lookup = v9fs_vfs_lookup,
.link = v9fs_vfs_link_dotl,
.symlink = v9fs_vfs_symlink_dotl,