fs/nilfs2/gcinode.c

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
18  * time after they are copied to a new log.  Dirty blocks made on the
19  * current generation and the blocks to be moved by GC never overlap
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
52  * %-EIO - I/O error.
54  * %-ENOMEM - Insufficient amount of memory available.
56  * %-ENOENT - The block specified with @pbn does not exist.
65 	bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);  in nilfs_gccache_submit_read_data()
67 		return -ENOMEM;  in nilfs_gccache_submit_read_data()
73 		struct the_nilfs *nilfs = inode->i_sb->s_fs_info;  in nilfs_gccache_submit_read_data()
75 		err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);  in nilfs_gccache_submit_read_data()
76 		if (unlikely(err)) /* -EIO, -ENOMEM, -ENOENT */  in nilfs_gccache_submit_read_data()
88 	bh->b_blocknr = pbn;  in nilfs_gccache_submit_read_data()
89 	bh->b_end_io = end_buffer_read_sync;  in nilfs_gccache_submit_read_data()
93 		bh->b_blocknr = vbn;  in nilfs_gccache_submit_read_data()
99 	folio_unlock(bh->b_folio);  in nilfs_gccache_submit_read_data()
100 	folio_put(bh->b_folio);  in nilfs_gccache_submit_read_data()
107  * nilfs_gccache_submit_read_node() - add node buffer and submit read request
108  * @inode - gc inode
109  * @pbn - physical block number for the block
110  * @vbn - virtual block number for the block
111  * @out_bh - indirect pointer to a buffer_head struct to receive the results
120  * %-EIO - I/O error.
122  * %-ENOMEM - Insufficient amount of memory available.
127 	struct inode *btnc_inode = NILFS_I(inode)->i_assoc_inode;  in nilfs_gccache_submit_read_node()
130 	ret = nilfs_btnode_submit_block(btnc_inode->i_mapping, vbn ? : pbn, pbn,  in nilfs_gccache_submit_read_node()
132 	if (ret == -EEXIST) /* internal code (cache hit) */  in nilfs_gccache_submit_read_node()
141 		struct inode *inode = bh->b_folio->mapping->host;  in nilfs_gccache_wait_and_mark_dirty()
143 		nilfs_err(inode->i_sb,  in nilfs_gccache_wait_and_mark_dirty()
146 			  inode->i_ino, (unsigned long long)bh->b_blocknr);  in nilfs_gccache_wait_and_mark_dirty()
147 		return -EIO;  in nilfs_gccache_wait_and_mark_dirty()
150 		return -EEXIST;  in nilfs_gccache_wait_and_mark_dirty()
154 		return -EIO;  in nilfs_gccache_wait_and_mark_dirty()
164 	inode->i_mode = S_IFREG;  in nilfs_init_gcinode()
165 	mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);  in nilfs_init_gcinode()
166 	inode->i_mapping->a_ops = &empty_aops;  in nilfs_init_gcinode()
168 	ii->i_flags = 0;  in nilfs_init_gcinode()
169 	nilfs_bmap_init_gc(ii->i_bmap);  in nilfs_init_gcinode()
175  * nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
180 	struct list_head *head = &nilfs->ns_gc_inodes;  in nilfs_remove_all_gcinodes()
185 		list_del_init(&ii->i_dirty);  in nilfs_remove_all_gcinodes()
186 		truncate_inode_pages(&ii->vfs_inode.i_data, 0);  in nilfs_remove_all_gcinodes()
187 		nilfs_btnode_cache_clear(ii->i_assoc_inode->i_mapping);  in nilfs_remove_all_gcinodes()
188 		iput(&ii->vfs_inode);  in nilfs_remove_all_gcinodes()