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split up btrfs_ioctl

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Add a helper per ioctl function to make the code more readable.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Christoph Hellwig 2007-09-14 10:22:57 -04:00 committed by David Woodhouse
parent 34287aa360
commit d03581f434
1 changed files with 63 additions and 51 deletions
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114
fs/btrfs/inode.c
View file

@ -1957,65 +1957,77 @@ int btrfs_defrag_file(struct file *file) {
return 0;
}
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
static int btrfs_ioctl_snap_create(struct btrfs_root *root, void __user *arg)
{
struct btrfs_ioctl_vol_args vol_args;
struct btrfs_dir_item *di;
struct btrfs_path *path;
int namelen;
u64 root_dirid;
if (copy_from_user(&vol_args, arg, sizeof(vol_args)))
return -EFAULT;
namelen = strlen(vol_args.name);
if (namelen > BTRFS_VOL_NAME_MAX)
return -EINVAL;
if (strchr(vol_args.name, '/'))
return -EINVAL;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
mutex_lock(&root->fs_info->fs_mutex);
di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
path, root_dirid,
vol_args.name, namelen, 0);
mutex_unlock(&root->fs_info->fs_mutex);
btrfs_free_path(path);
if (di && !IS_ERR(di))
return -EEXIST;
if (IS_ERR(di))
return PTR_ERR(di);
if (root == root->fs_info->tree_root)
return create_subvol(root, vol_args.name, namelen);
return create_snapshot(root, vol_args.name, namelen);
}
static int btrfs_ioctl_defrag(struct file *file)
{
struct inode *inode = file->f_path.dentry->d_inode;
struct btrfs_root *root = BTRFS_I(inode)->root;
struct btrfs_ioctl_vol_args vol_args;
int ret = 0;
struct btrfs_dir_item *di;
int namelen;
struct btrfs_path *path;
u64 root_dirid;
switch (inode->i_mode & S_IFMT) {
case S_IFDIR:
mutex_lock(&root->fs_info->fs_mutex);
btrfs_defrag_root(root, 0);
btrfs_defrag_root(root->fs_info->extent_root, 0);
mutex_unlock(&root->fs_info->fs_mutex);
break;
case S_IFREG:
btrfs_defrag_file(file);
break;
}
return 0;
}
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
struct btrfs_root *root = BTRFS_I(file->f_path.dentry->d_inode)->root;
switch (cmd) {
case BTRFS_IOC_SNAP_CREATE:
if (copy_from_user(&vol_args,
(struct btrfs_ioctl_vol_args __user *)arg,
sizeof(vol_args)))
return -EFAULT;
namelen = strlen(vol_args.name);
if (namelen > BTRFS_VOL_NAME_MAX)
return -EINVAL;
if (strchr(vol_args.name, '/'))
return -EINVAL;
path = btrfs_alloc_path();
if (!path)
return -ENOMEM;
root_dirid = root->fs_info->sb->s_root->d_inode->i_ino,
mutex_lock(&root->fs_info->fs_mutex);
di = btrfs_lookup_dir_item(NULL, root->fs_info->tree_root,
path, root_dirid,
vol_args.name, namelen, 0);
mutex_unlock(&root->fs_info->fs_mutex);
btrfs_free_path(path);
if (di && !IS_ERR(di))
return -EEXIST;
if (IS_ERR(di))
return PTR_ERR(di);
if (root == root->fs_info->tree_root)
ret = create_subvol(root, vol_args.name, namelen);
else
ret = create_snapshot(root, vol_args.name, namelen);
break;
return btrfs_ioctl_snap_create(root, (void __user *)arg);
case BTRFS_IOC_DEFRAG:
if (S_ISDIR(inode->i_mode)) {
mutex_lock(&root->fs_info->fs_mutex);
btrfs_defrag_root(root, 0);
btrfs_defrag_root(root->fs_info->extent_root, 0);
mutex_unlock(&root->fs_info->fs_mutex);
} else if (S_ISREG(inode->i_mode)) {
btrfs_defrag_file(file);
}
ret = 0;
break;
default:
return -ENOTTY;
return btrfs_ioctl_defrag(file);
}
return ret;
return -ENOTTY;
}
/*