1 // SPDX-License-Identifier: GPL-2.0
5  * Copyright (c) 2020-2021 Huawei Device Co., Ltd.
22  * = DOMAIN {3} : lower's dev_id {29} : lower's ino_raw {32}
60 	/* The lower inode of local/merge/root(part) inode */
76  * iget_test - whether or not the inode with matched hashval is the one we are
88 	WARN_ON(ia->ino.domain < DOMAIN_ROOT ||  in iget_test()
89 		ia->ino.domain >= DOMAIN_INVALID);  in iget_test()
91 	if (read_ino_domain(inode->i_ino) == DOMAIN_ROOT)  in iget_test()
93 	if (read_ino_domain(inode->i_ino) != ia->ino.domain)  in iget_test()
96 	switch (ia->ino.domain) {  in iget_test()
97 	case DOMAIN_MERGE_VIEW:  in iget_test()
98 	case DOMAIN_CLOUD_MERGE_VIEW:  in iget_test()
99 		res = (ia->lo_i == hii->lower_inode);  in iget_test()
101 	case DOMAIN_DEVICE_LOCAL:  in iget_test()
102 		res = (ia->lo_i == hii->lower_inode);  in iget_test()
104 	case DOMAIN_DEVICE_REMOTE:  in iget_test()
105 		res = (ia->peer == hii->conn &&  in iget_test()
106 		       ia->remote_ino == hii->remote_ino);  in iget_test()
108 	case DOMAIN_DEVICE_CLOUD:  in iget_test()
109 		res = (ia->cloud_record_id &&  in iget_test()
110 		       (memcmp(ia->cloud_record_id, hii->cloud_record_id,  in iget_test()
112 		       (ia->reserved[0] == hii->reserved[0]));  in iget_test()
120  * iget_set - initialize a inode with iget_args
130 	inode->i_ino = ia->ino.ino_output;  in iget_set()
133 	hii->conn = ia->peer;  in iget_set()
134 	hii->remote_ino = ia->remote_ino;  in iget_set()
135 	hii->lower_inode = ia->lo_i;  in iget_set()
137 	if (ia->cloud_record_id) {  in iget_set()
138 		memcpy(hii->cloud_record_id, ia->cloud_record_id, CLOUD_RECORD_ID_LEN);  in iget_set()
139 		memcpy(hii->reserved, ia->reserved, CLOUD_DENTRY_RESERVED_LENGTH);  in iget_set()
159  * hmdfs_iget5_locked_merge - obtain an inode for the merge-view
162  * @fst_lo_i: the lower inode of it's first comrade
164  * Simply replace the lower's domain for a new ino.
178 		hmdfs_err("Received a invalid lower inode");  in hmdfs_iget5_locked_merge()
186 	ia.ino.ino_raw = d_inode(fst_lo_d)->i_ino;  in hmdfs_iget5_locked_merge()
187 	ia.ino.dev_id = hmdfs_d(fst_lo_d)->device_id;  in hmdfs_iget5_locked_merge()
204 		hmdfs_err("Received a invalid lower inode");  in hmdfs_iget5_locked_cloud_merge()
212 	ia.ino.ino_raw = d_inode(fst_lo_d)->i_ino;  in hmdfs_iget5_locked_cloud_merge()
213 	ia.ino.dev_id = hmdfs_d(fst_lo_d)->device_id;  in hmdfs_iget5_locked_cloud_merge()
219  * hmdfs_iget5_locked_local - obtain an inode for the local-dev-view
222  * @lo_i: the lower inode from local filesystem
239 		hmdfs_err("Received a invalid lower inode");  in hmdfs_iget5_locked_local()
242 	ia.ino.ino_raw = make_ino_raw_dev_local(lo_i->i_ino);  in hmdfs_iget5_locked_local()
249  * hmdfs_iget5_locked_remote - obtain an inode for the remote-dev-view
279 	ia.ino.dev_id = peer->device_id;  in hmdfs_iget5_locked_remote()
285  * hmdfs_iget5_locked_cloud - obtain an inode for the cloud-dev-view
305 		.cloud_record_id = res->record_id,  in hmdfs_iget5_locked_cloud()
306 		.reserved = res->reserved,  in hmdfs_iget5_locked_cloud()
315 	ia.ino.ino_raw = make_ino_raw_cloud(res->record_id) + res->reserved[0];  in hmdfs_iget5_locked_cloud()
316 	ia.ino.dev_id = peer->device_id;  in hmdfs_iget5_locked_cloud()
331 		.ino.dev_id = peer ? peer->device_id : 0,  in hmdfs_iget_locked_root()
350 	loff_t upper_size = i_size_read(upper_file->f_inode);  in hmdfs_update_upper_file()
351 	loff_t lower_size = i_size_read(lower_file->f_inode);  in hmdfs_update_upper_file()
353 	if (upper_file->f_inode->i_mapping && upper_size != lower_size) {  in hmdfs_update_upper_file()
354 		i_size_write(upper_file->f_inode, lower_size);  in hmdfs_update_upper_file()
355 		truncate_inode_pages(upper_file->f_inode->i_mapping, 0);  in hmdfs_update_upper_file()