static struct inode *scfs_alloc_inode(struct super_block *sb)
{
struct scfs_inode_info *sii;
sii = kmem_cache_alloc(scfs_inode_info_cache, GFP_KERNEL);
if (!sii)
return NULL;
profile_add_kmcached(sizeof(struct scfs_inode_info), SCFS_S(sb));
memset(sii, 0, offsetof(struct scfs_inode_info, vfs_inode));
sii->vfs_inode.i_version = 1;
if (SCFS_S(sb)->options.flags & SCFS_DATA_COMPRESSABLE)
sii->flags |= SCFS_DATA_COMPRESSABLE;
mutex_init(&sii->lower_file_mutex);
mutex_init(&sii->cinfo_mutex);
INIT_LIST_HEAD(&sii->cinfo_list);
#ifdef SCFS_MULTI_THREAD_COMPRESSION
INIT_LIST_HEAD(&sii->cbm_list);
sii->cbm_list_comp_count = 0;
sii->cbm_list_write_count = 0;
sii->is_inserted_to_sii_list = 0;
sii->cbm_list_comp = NULL;
#endif
return &sii->vfs_inode;
}
static int scfs_open(struct inode *inode, struct file *file)
{
struct scfs_sb_info *sbi = SCFS_S(inode->i_sb);
struct scfs_inode_info *sii = SCFS_I(inode);
struct scfs_file_info *fi;
int ret = 0;
struct file *lower_file;
if (IS_WROPENED(sii)) {
SCFS_PRINT("This file is already opened with 'WRITE' flag\n");
return -EPERM;
}
fi = kmem_cache_zalloc(scfs_file_info_cache, GFP_KERNEL);
if (!fi)
return -ENOMEM;
profile_add_kmcached(sizeof(struct scfs_file_info), sbi);
file->private_data = fi;
mutex_lock(&sii->cinfo_mutex);
if (IS_INVALID_META(sii)) {
SCFS_PRINT("meta is invalid, so we should re-load it\n");
ret = scfs_reload_meta(file);
if (ret) {
SCFS_PRINT_ERROR("error in re-reading footer, err : %d\n", ret);
goto out;
}
} else if (sii->compressed && !sii->cinfo_array) {
/* 1st lower-open is for getting cinfo */
ret = scfs_initialize_lower_file(file->f_dentry, &lower_file, O_RDONLY);
if (ret) {
SCFS_PRINT_ERROR("err in get_lower_file %s\n",
file->f_dentry->d_name.name);
goto out;
}
scfs_set_lower_file(file, lower_file);
SCFS_PRINT("info size = %d \n", sii->cinfo_array_size);
ret = scfs_load_cinfo(sii, lower_file);
if (ret) {
SCFS_PRINT_ERROR("err in loading cinfo, ret : %d\n",
file->f_dentry->d_name.name);
fput(lower_file);
goto out;
}
fput(lower_file);
}
ret = scfs_initialize_lower_file(file->f_dentry, &lower_file, file->f_flags);
if (ret) {
SCFS_PRINT_ERROR("err in get_lower_file %s\n",
file->f_dentry->d_name.name);
goto out;
}
scfs_set_lower_file(file, lower_file);
out:
if (!ret) {
fsstack_copy_attr_all(inode, scfs_lower_inode(inode));
if (file->f_flags & (O_RDWR | O_WRONLY))
MAKE_WROPENED(sii);
} else {
scfs_set_lower_file(file, NULL);
kmem_cache_free(scfs_file_info_cache, file->private_data);
profile_sub_kmcached(sizeof(struct scfs_file_info), sbi);
sii->cinfo_array = NULL;
}
mutex_unlock(&sii->cinfo_mutex);
SCFS_PRINT("lower, dentry name : %s, count : %d, ret : %d\n",
file->f_dentry->d_name.name, file->f_dentry->d_count, ret);
return ret;
}