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btrfs_mkdir
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
David Woodhouse
parent
dcea79152c
commit
f7922033ef
184
fs/btrfs/super.c
184
fs/btrfs/super.c
@ -18,124 +18,6 @@ static struct inode_operations btrfs_dir_inode_operations;
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static struct super_operations btrfs_super_ops;
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static struct file_operations btrfs_dir_file_operations;
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#if 0
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/* some random number */
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static struct super_operations ramfs_ops;
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static struct backing_dev_info ramfs_backing_dev_info = {
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.ra_pages = 0, /* No readahead */
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.capabilities = BDI_CAP_NO_ACCT_DIRTY | BDI_CAP_NO_WRITEBACK |
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BDI_CAP_MAP_DIRECT | BDI_CAP_MAP_COPY |
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BDI_CAP_READ_MAP | BDI_CAP_WRITE_MAP | BDI_CAP_EXEC_MAP,
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};
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struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev)
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{
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struct inode * inode = new_inode(sb);
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if (inode) {
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inode->i_mode = mode;
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inode->i_uid = current->fsuid;
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inode->i_gid = current->fsgid;
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inode->i_blocks = 0;
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inode->i_mapping->a_ops = &ramfs_aops;
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inode->i_mapping->backing_dev_info = &ramfs_backing_dev_info;
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inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
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switch (mode & S_IFMT) {
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default:
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init_special_inode(inode, mode, dev);
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break;
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case S_IFREG:
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inode->i_op = &ramfs_file_inode_operations;
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inode->i_fop = &ramfs_file_operations;
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break;
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case S_IFDIR:
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inode->i_op = &ramfs_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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/* directory inodes start off with i_nlink == 2 (for "." entry) */
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inc_nlink(inode);
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break;
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case S_IFLNK:
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inode->i_op = &page_symlink_inode_operations;
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break;
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}
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}
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return inode;
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}
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/*
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* File creation. Allocate an inode, and we're done..
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*/
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/* SMP-safe */
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static int
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ramfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
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{
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struct inode * inode = ramfs_get_inode(dir->i_sb, mode, dev);
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int error = -ENOSPC;
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if (inode) {
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if (dir->i_mode & S_ISGID) {
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inode->i_gid = dir->i_gid;
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if (S_ISDIR(mode))
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inode->i_mode |= S_ISGID;
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}
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d_instantiate(dentry, inode);
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dget(dentry); /* Extra count - pin the dentry in core */
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error = 0;
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
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}
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return error;
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}
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static int ramfs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
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{
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int retval = ramfs_mknod(dir, dentry, mode | S_IFDIR, 0);
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if (!retval)
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inc_nlink(dir);
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return retval;
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}
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static int ramfs_create(struct inode *dir, struct dentry *dentry, int mode, struct nameidata *nd)
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{
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return ramfs_mknod(dir, dentry, mode | S_IFREG, 0);
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}
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static int ramfs_symlink(struct inode * dir, struct dentry *dentry, const char * symname)
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{
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struct inode *inode;
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int error = -ENOSPC;
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inode = ramfs_get_inode(dir->i_sb, S_IFLNK|S_IRWXUGO, 0);
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if (inode) {
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int l = strlen(symname)+1;
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error = page_symlink(inode, symname, l);
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if (!error) {
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if (dir->i_mode & S_ISGID)
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inode->i_gid = dir->i_gid;
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d_instantiate(dentry, inode);
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dget(dentry);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME;
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} else
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iput(inode);
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}
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return error;
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}
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static struct inode_operations ramfs_dir_inode_operations = {
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.create = ramfs_create,
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.lookup = simple_lookup,
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.link = simple_link,
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.unlink = simple_unlink,
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.symlink = ramfs_symlink,
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.mkdir = ramfs_mkdir,
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.rmdir = simple_rmdir,
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.mknod = ramfs_mknod,
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.rename = simple_rename,
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};
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#endif
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static void btrfs_read_locked_inode(struct inode *inode)
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{
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struct btrfs_path path;
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@ -533,9 +415,11 @@ static struct inode *btrfs_new_inode(struct btrfs_trans_handle *trans,
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inode->i_ino = objectid;
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inode->i_blocks = 0;
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inode->i_mtime = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
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/* FIXME do this on link */
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if (mode & S_IFDIR)
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inode->i_size = 3;
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fill_inode_item(&inode_item, inode);
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key.objectid = objectid;
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key.flags = 0;
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key.offset = 0;
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@ -603,6 +487,67 @@ out_unlock:
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return err;
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}
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static int btrfs_make_empty_dir(struct btrfs_trans_handle *trans,
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struct inode *inode, struct inode *dir)
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{
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struct btrfs_root *root = btrfs_sb(inode->i_sb);
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int ret;
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char buf[2];
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buf[0] = '.';
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buf[1] = '.';
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ret = btrfs_insert_dir_item(trans, root, buf, 1, inode->i_ino,
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inode->i_ino, 1);
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if (ret)
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goto error;
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ret = btrfs_insert_dir_item(trans, root, buf, 2, inode->i_ino,
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dir->i_ino, 1);
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error:
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return ret;
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}
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static int btrfs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
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{
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struct inode *inode;
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struct btrfs_trans_handle *trans;
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struct btrfs_root *root = btrfs_sb(dir->i_sb);
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int err = 0;
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int drop_on_err = 0;
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mutex_lock(&root->fs_info->fs_mutex);
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trans = btrfs_start_transaction(root, 1);
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if (IS_ERR(trans)) {
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err = PTR_ERR(trans);
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goto out_unlock;
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}
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inode = btrfs_new_inode(trans, dir, S_IFDIR | mode);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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goto out_fail;
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}
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drop_on_err = 1;
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inode->i_op = &btrfs_dir_inode_operations;
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inode->i_fop = &btrfs_dir_file_operations;
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err = btrfs_make_empty_dir(trans, inode, dir);
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if (err)
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goto out_fail;
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err = btrfs_add_link(trans, dentry, inode);
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if (err)
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goto out_fail;
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d_instantiate(dentry, inode);
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mark_inode_dirty(inode);
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drop_on_err = 0;
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out_fail:
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btrfs_end_transaction(trans, root);
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out_unlock:
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mutex_unlock(&root->fs_info->fs_mutex);
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if (drop_on_err)
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iput(inode);
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return err;
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}
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static int btrfs_sync_fs(struct super_block *sb, int wait)
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{
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struct btrfs_trans_handle *trans;
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@ -661,6 +606,7 @@ static struct inode_operations btrfs_dir_inode_operations = {
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.lookup = btrfs_lookup,
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.create = btrfs_create,
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.unlink = btrfs_unlink,
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.mkdir = btrfs_mkdir,
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};
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static struct file_operations btrfs_dir_file_operations = {
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