[RFC v2 55/83] Namei: mkdir

Andiry Xu
2018-03-10T18:21:26Z

NOVA mkdir is similar to create. The difference is NOVA will
allocate log page for the newly created directory, and append
init dentries.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
fs/nova/namei.c | 74 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 74 insertions(+)

diff --git a/fs/nova/namei.c b/fs/nova/namei.c
index a07cc4f..a95b2fe 100644
--- a/fs/nova/namei.c
+++ b/fs/nova/namei.c
@@ -207,6 +207,79 @@ static int nova_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
return err;
}

+static int nova_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
+{
+ struct super_block *sb = dir->i_sb;
+ struct inode *inode;
+ struct nova_inode *pidir, *pi;
+ struct nova_inode_info *si, *sidir;
+ struct nova_inode_info_header *sih = NULL;
+ struct nova_inode_update update;
+ u64 pi_addr = 0;
+ u64 ino;
+ u64 epoch_id;
+ int err = -EMLINK;
+ timing_t mkdir_time;
+
+ NOVA_START_TIMING(mkdir_t, mkdir_time);
+ if (dir->i_nlink >= NOVA_LINK_MAX)
+ goto out;
+
+ ino = nova_new_nova_inode(sb, &pi_addr);
+ if (ino == 0)
+ goto out_err;
+
+ epoch_id = nova_get_epoch_id(sb);
+ nova_dbgv("%s: name %s\n", __func__, dentry->d_name.name);
+ nova_dbgv("%s: inode %llu, dir %lu, link %d\n", __func__,
+ ino, dir->i_ino, dir->i_nlink);
+
+ update.tail = 0;
+ err = nova_add_dentry(dentry, ino, 1, &update, epoch_id);
+ if (err) {
+ nova_dbg("failed to add dir entry\n");
+ goto out_err;
+ }
+
+ inode = nova_new_vfs_inode(TYPE_MKDIR, dir, pi_addr, ino,
+ S_IFDIR | mode, sb->s_blocksize,
+ 0, &dentry->d_name, epoch_id);
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
+ goto out_err;
+ }
+
+ pi = nova_get_inode(sb, inode);
+ err = nova_append_dir_init_entries(sb, pi, inode->i_ino, dir->i_ino,
+ epoch_id);
+ if (err < 0)
+ goto out_err;
+
+ /* Build the dir tree */
+ si = NOVA_I(inode);
+ sih = &si->header;
+ nova_rebuild_dir_inode_tree(sb, pi, pi_addr, sih);
+
+ pidir = nova_get_inode(sb, dir);
+ sidir = NOVA_I(dir);
+ sih = &si->header;
+ dir->i_blocks = sih->i_blocks;
+ inc_nlink(dir);
+ d_instantiate(dentry, inode);
+ unlock_new_inode(inode);
+
+ nova_lite_transaction_for_new_inode(sb, pi, pidir, inode, dir,
+ &update);
+out:
+ NOVA_END_TIMING(mkdir_t, mkdir_time);
+ return err;
+
+out_err:
+// clear_nlink(inode);
+ nova_err(sb, "%s return %d\n", __func__, err);
+ goto out;
+}
+
struct dentry *nova_get_parent(struct dentry *child)
{
struct inode *inode;
@@ -234,5 +307,6 @@ struct dentry *nova_get_parent(struct dentry *child)
const struct inode_operations nova_dir_inode_operations = {
.create = nova_create,
.lookup = nova_lookup,
+ .mkdir = nova_mkdir,
.mknod = nova_mknod,
};
--
2.7.4