fuse: switch to ->iterate_shared()

Switch dcache pre-seeding on readdir to d_alloc_parallel();
nothing else is needed.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index b618527..b941905 100644 (file)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1162,7 +1162,6 @@ static int fuse_direntplus_link(struct file *file,
                                struct fuse_direntplus *direntplus,
                                u64 attr_version)
 {
-       int err;
        struct fuse_entry_out *o = &direntplus->entry_out;
        struct fuse_dirent *dirent = &direntplus->dirent;
        struct dentry *parent = file->f_path.dentry;
@@ -1172,6 +1171,7 @@ static int fuse_direntplus_link(struct file *file,
        struct inode *dir = d_inode(parent);
        struct fuse_conn *fc;
        struct inode *inode;
+       DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq);
 
        if (!o->nodeid) {
                /*
@@ -1204,65 +1204,61 @@ static int fuse_direntplus_link(struct file *file,
 
        name.hash = full_name_hash(name.name, name.len);
        dentry = d_lookup(parent, &name);
-       if (dentry) {
+       if (!dentry) {
+retry:
+               dentry = d_alloc_parallel(parent, &name, &wq);
+               if (IS_ERR(dentry))
+                       return PTR_ERR(dentry);
+       }
+       if (!d_in_lookup(dentry)) {
+               struct fuse_inode *fi;
                inode = d_inode(dentry);
-               if (!inode) {
-                       d_drop(dentry);
-               } else if (get_node_id(inode) != o->nodeid ||
-                          ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
+               if (!inode ||
+                   get_node_id(inode) != o->nodeid ||
+                   ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
                        d_invalidate(dentry);
-               } else if (is_bad_inode(inode)) {
-                       err = -EIO;
-                       goto out;
-               } else {
-                       struct fuse_inode *fi;
-                       fi = get_fuse_inode(inode);
-                       spin_lock(&fc->lock);
-                       fi->nlookup++;
-                       spin_unlock(&fc->lock);
-
-                       fuse_change_attributes(inode, &o->attr,
-                                              entry_attr_timeout(o),
-                                              attr_version);
-
-                       /*
-                        * The other branch to 'found' comes via fuse_iget()
-                        * which bumps nlookup inside
-                        */
-                       goto found;
+                       dput(dentry);
+                       goto retry;
+               }
+               if (is_bad_inode(inode)) {
+                       dput(dentry);
+                       return -EIO;
                }
-               dput(dentry);
-       }
-
-       dentry = d_alloc(parent, &name);
-       err = -ENOMEM;
-       if (!dentry)
-               goto out;
 
-       inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
-                         &o->attr, entry_attr_timeout(o), attr_version);
-       if (!inode)
-               goto out;
+               fi = get_fuse_inode(inode);
+               spin_lock(&fc->lock);
+               fi->nlookup++;
+               spin_unlock(&fc->lock);
 
-       alias = d_splice_alias(inode, dentry);
-       err = PTR_ERR(alias);
-       if (IS_ERR(alias))
-               goto out;
+               fuse_change_attributes(inode, &o->attr,
+                                      entry_attr_timeout(o),
+                                      attr_version);
+               /*
+                * The other branch comes via fuse_iget()
+                * which bumps nlookup inside
+                */
+       } else {
+               inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
+                                 &o->attr, entry_attr_timeout(o),
+                                 attr_version);
+               if (!inode)
+                       inode = ERR_PTR(-ENOMEM);
 
-       if (alias) {
-               dput(dentry);
-               dentry = alias;
+               alias = d_splice_alias(inode, dentry);
+               d_lookup_done(dentry);
+               if (alias) {
+                       dput(dentry);
+                       dentry = alias;
+               }
+               if (IS_ERR(dentry))
+                       return PTR_ERR(dentry);
        }
-
-found:
        if (fc->readdirplus_auto)
                set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
        fuse_change_entry_timeout(dentry, o);
 
-       err = 0;
-out:
        dput(dentry);
-       return err;
+       return 0;
 }
 
 static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
@@ -1892,7 +1888,7 @@ static const struct inode_operations fuse_dir_inode_operations = {
 static const struct file_operations fuse_dir_operations = {
        .llseek         = generic_file_llseek,
        .read           = generic_read_dir,
-       .iterate        = fuse_readdir,
+       .iterate_shared = fuse_readdir,
        .open           = fuse_dir_open,
        .release        = fuse_dir_release,
        .fsync          = fuse_dir_fsync,