/*
* Called by iput() when the inode reference count reached zero
* and the inode is not hashed anywhere. Used to clear anything
* that needs to be, before the inode is completely destroyed and put
* on the inode free list.
*/
static void wrapfs_evict_inode(struct inode *inode)
{
struct inode *lower_inode;
truncate_inode_pages(&inode->i_data, 0);
end_writeback(inode);
/*
* Decrement a reference to a lower_inode, which was incremented
* by our read_inode when it was created initially.
*/
lower_inode = wrapfs_lower_inode(inode);
wrapfs_set_lower_inode(inode, NULL);
iput(lower_inode);
}
struct inode *wrapfs_iget(struct super_block *sb, struct inode *lower_inode)
{
struct wrapfs_inode_info *info;
struct inode *inode; /* the new inode to return */
int err;
inode = iget5_locked(sb, /* our superblock */
/*
* hashval: we use inode number, but we can
* also use "(unsigned long)lower_inode"
* instead.
*/
lower_inode->i_ino, /* hashval */
wrapfs_inode_test, /* inode comparison function */
wrapfs_inode_set, /* inode init function */
lower_inode); /* data passed to test+set fxns */
if (!inode) {
err = -EACCES;
iput(lower_inode);
return ERR_PTR(err);
}
/* if found a cached inode, then just return it */
if (!(inode->i_state & I_NEW))
return inode;
/* initialize new inode */
info = WRAPFS_I(inode);
inode->i_ino = lower_inode->i_ino;
if (!igrab(lower_inode)) {
err = -ESTALE;
return ERR_PTR(err);
}
wrapfs_set_lower_inode(inode, lower_inode);
inode->i_version++;
/* use different set of inode ops for symlinks & directories */
if (S_ISDIR(lower_inode->i_mode))
inode->i_op = &wrapfs_dir_iops;
else if (S_ISLNK(lower_inode->i_mode))
inode->i_op = &wrapfs_symlink_iops;
else
inode->i_op = &wrapfs_main_iops;
/* use different set of file ops for directories */
if (S_ISDIR(lower_inode->i_mode))
inode->i_fop = &wrapfs_dir_fops;
else
inode->i_fop = &wrapfs_main_fops;
inode->i_mapping->a_ops = &wrapfs_aops;
inode->i_atime.tv_sec = 0;
inode->i_atime.tv_nsec = 0;
inode->i_mtime.tv_sec = 0;
inode->i_mtime.tv_nsec = 0;
inode->i_ctime.tv_sec = 0;
inode->i_ctime.tv_nsec = 0;
/* properly initialize special inodes */
if (S_ISBLK(lower_inode->i_mode) || S_ISCHR(lower_inode->i_mode) ||
S_ISFIFO(lower_inode->i_mode) || S_ISSOCK(lower_inode->i_mode))
init_special_inode(inode, lower_inode->i_mode,
lower_inode->i_rdev);
/* all well, copy inode attributes */
fsstack_copy_attr_all(inode, lower_inode);
fsstack_copy_inode_size(inode, lower_inode);
unlock_new_inode(inode);
return inode;
}
