1 // SPDX-License-Identifier: GPL-2.0+
5  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
12  * This file adds the cache of on-disk blocks to be moved in garbage
13  * collection.  The disk blocks are held with dummy inodes (called
38  * nilfs_gccache_submit_read_data() - add data buffer and submit read request
39  * @inode - gc inode
40  * @blkoff - dummy offset treated as the key for the page cache
41  * @pbn - physical block number of the block
42  * @vbn - virtual block number of the block, 0 for non-virtual block
43  * @out_bh - indirect pointer to a buffer_head struct to receive the results
51  * * %-EIO	- I/O error (including metadata corruption).
52  * * %-ENOENT	- The block specified with @pbn does not exist.
53  * * %-ENOMEM	- Insufficient memory available.
62 	bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);  in nilfs_gccache_submit_read_data()
64 		return -ENOMEM;  in nilfs_gccache_submit_read_data()
70 		struct the_nilfs *nilfs = inode->i_sb->s_fs_info;  in nilfs_gccache_submit_read_data()
72 		err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);  in nilfs_gccache_submit_read_data()
73 		if (unlikely(err)) /* -EIO, -ENOMEM, -ENOENT */  in nilfs_gccache_submit_read_data()
85 	bh->b_blocknr = pbn;  in nilfs_gccache_submit_read_data()
86 	bh->b_end_io = end_buffer_read_sync;  in nilfs_gccache_submit_read_data()
90 		bh->b_blocknr = vbn;  in nilfs_gccache_submit_read_data()
96 	folio_unlock(bh->b_folio);  in nilfs_gccache_submit_read_data()
97 	folio_put(bh->b_folio);  in nilfs_gccache_submit_read_data()
104  * nilfs_gccache_submit_read_node() - add node buffer and submit read request
105  * @inode - gc inode
106  * @pbn - physical block number for the block
107  * @vbn - virtual block number for the block
108  * @out_bh - indirect pointer to a buffer_head struct to receive the results
112  * caller to avoid translation of the disk block address.
116  * * %-EIO	- I/O error (including metadata corruption).
117  * * %-ENOENT	- Invalid virtual block address.
118  * * %-ENOMEM	- Insufficient memory available.
123 	struct inode *btnc_inode = NILFS_I(inode)->i_assoc_inode;  in nilfs_gccache_submit_read_node()
126 	ret = nilfs_btnode_submit_block(btnc_inode->i_mapping, vbn ? : pbn, pbn,  in nilfs_gccache_submit_read_node()
128 	if (ret == -EEXIST) /* internal code (cache hit) */  in nilfs_gccache_submit_read_node()
137 		struct inode *inode = bh->b_folio->mapping->host;  in nilfs_gccache_wait_and_mark_dirty()
139 		nilfs_err(inode->i_sb,  in nilfs_gccache_wait_and_mark_dirty()
142 			  inode->i_ino, (unsigned long long)bh->b_blocknr);  in nilfs_gccache_wait_and_mark_dirty()
143 		return -EIO;  in nilfs_gccache_wait_and_mark_dirty()
146 		return -EEXIST;  in nilfs_gccache_wait_and_mark_dirty()
150 		return -EIO;  in nilfs_gccache_wait_and_mark_dirty()
160 	inode->i_mode = S_IFREG;  in nilfs_init_gcinode()
161 	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);  in nilfs_init_gcinode()
162 	inode->i_mapping->a_ops = &nilfs_buffer_cache_aops;  in nilfs_init_gcinode()
164 	ii->i_flags = 0;  in nilfs_init_gcinode()
165 	nilfs_bmap_init_gc(ii->i_bmap);  in nilfs_init_gcinode()
171  * nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
176 	struct list_head *head = &nilfs->ns_gc_inodes;  in nilfs_remove_all_gcinodes()
181 		list_del_init(&ii->i_dirty);  in nilfs_remove_all_gcinodes()
182 		truncate_inode_pages(&ii->vfs_inode.i_data, 0);  in nilfs_remove_all_gcinodes()
183 		nilfs_btnode_cache_clear(ii->i_assoc_inode->i_mapping);  in nilfs_remove_all_gcinodes()
184 		iput(&ii->vfs_inode);  in nilfs_remove_all_gcinodes()