afs: Make afs_mkdir() locally initialise a new directory's content

Initialise a new directory's content when it is created by mkdir locally
rather than downloading the content from the server as we can predict what
it's going to look like.

Signed-off-by: David Howells <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
cc: Marc Dionne <[email protected]>
cc: [email protected]
Signed-off-by: Christian Brauner <[email protected]>

Author: dhowells

fs/afs/dir.c

@@ -1264,6 +1264,7 @@ void afs_check_for_remote_deletion(struct afs_operation *op)
  */
 static void afs_vnode_new_inode(struct afs_operation *op)
 {
+	struct afs_vnode_param *dvp = &op->file[0];
 	struct afs_vnode_param *vp = &op->file[1];
 	struct afs_vnode *vnode;
 	struct inode *inode;
@@ -1283,6 +1284,8 @@ static void afs_vnode_new_inode(struct afs_operation *op)
 
 	vnode = AFS_FS_I(inode);
 	set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags);
+	if (S_ISDIR(inode->i_mode))
+		afs_mkdir_init_dir(vnode, dvp->vnode);
 	if (!afs_op_error(op))
 		afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb);
 	d_instantiate(op->dentry, inode);

fs/afs/dir_edit.c

@@ -556,3 +556,52 @@ void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_d
 			   0, 0, 0, 0, "..");
 	goto out;
 }
+
+/*
+ * Initialise a new directory.  We need to fill in the "." and ".." entries.
+ */
+void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_dvnode)
+{
+	union afs_xdr_dir_block *meta;
+	struct afs_dir_iter iter = { .dvnode = dvnode };
+	union afs_xdr_dirent *de;
+	unsigned int slot = AFS_DIR_RESV_BLOCKS0;
+	loff_t i_size;
+
+	i_size = i_size_read(&dvnode->netfs.inode);
+	if (i_size != AFS_DIR_BLOCK_SIZE) {
+		afs_invalidate_dir(dvnode, afs_dir_invalid_edit_add_bad_size);
+		return;
+	}
+
+	meta = afs_dir_get_block(&iter, 0);
+	if (!meta)
+		return;
+
+	afs_edit_init_block(meta, meta, 0);
+
+	de = &meta->dirents[slot];
+	de->u.valid  = 1;
+	de->u.vnode  = htonl(dvnode->fid.vnode);
+	de->u.unique = htonl(dvnode->fid.unique);
+	memcpy(de->u.name, ".", 2);
+	trace_afs_edit_dir(dvnode, afs_edit_dir_for_mkdir, afs_edit_dir_mkdir, 0, slot,
+			   dvnode->fid.vnode, dvnode->fid.unique, ".");
+	slot++;
+
+	de = &meta->dirents[slot];
+	de->u.valid  = 1;
+	de->u.vnode  = htonl(parent_dvnode->fid.vnode);
+	de->u.unique = htonl(parent_dvnode->fid.unique);
+	memcpy(de->u.name, "..", 3);
+	trace_afs_edit_dir(dvnode, afs_edit_dir_for_mkdir, afs_edit_dir_mkdir, 0, slot,
+			   parent_dvnode->fid.vnode, parent_dvnode->fid.unique, "..");
+
+	afs_set_contig_bits(meta, AFS_DIR_RESV_BLOCKS0, 2);
+	meta->meta.alloc_ctrs[0] -= 2;
+	kunmap_local(meta);
+
+	netfs_single_mark_inode_dirty(&dvnode->netfs.inode);
+	set_bit(AFS_VNODE_DIR_VALID, &dvnode->flags);
+	set_bit(AFS_VNODE_DIR_READ, &dvnode->flags);
+}

fs/afs/internal.h

@@ -1078,6 +1078,7 @@ extern void afs_edit_dir_add(struct afs_vnode *, struct qstr *, struct afs_fid *
 extern void afs_edit_dir_remove(struct afs_vnode *, struct qstr *, enum afs_edit_dir_reason);
 void afs_edit_dir_update_dotdot(struct afs_vnode *vnode, struct afs_vnode *new_dvnode,
 				enum afs_edit_dir_reason why);
+void afs_mkdir_init_dir(struct afs_vnode *dvnode, struct afs_vnode *parent_vnode);
 
 /*
  * dir_silly.c

include/trace/events/afs.h

@@ -350,6 +350,7 @@ enum yfs_cm_operation {
 	EM(afs_dir_invalid_edit_add_no_slots,	"edit-add-no-slots") \
 	EM(afs_dir_invalid_edit_add_too_many_blocks, "edit-add-too-many-blocks") \
 	EM(afs_dir_invalid_edit_get_block,	"edit-get-block") \
+	EM(afs_dir_invalid_edit_mkdir,		"edit-mkdir") \
 	EM(afs_dir_invalid_edit_rem_bad_size,	"edit-rem-bad-size") \
 	EM(afs_dir_invalid_edit_rem_wrong_name,	"edit-rem-wrong_name") \
 	EM(afs_dir_invalid_edit_upd_bad_size,	"edit-upd-bad-size") \
@@ -371,6 +372,7 @@ enum yfs_cm_operation {
 	EM(afs_edit_dir_delete_error,		"d_err ") \
 	EM(afs_edit_dir_delete_inval,		"d_invl") \
 	EM(afs_edit_dir_delete_noent,		"d_nent") \
+	EM(afs_edit_dir_mkdir,			"mk_ent") \
 	EM(afs_edit_dir_update_dd,		"u_ddot") \
 	EM(afs_edit_dir_update_error,		"u_fail") \
 	EM(afs_edit_dir_update_inval,		"u_invl") \