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Linux/fs/nilfs2/gcinode.c

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  1 /*
  2  * gcinode.c - dummy inodes to buffer blocks for garbage collection
  3  *
  4  * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as published by
  8  * the Free Software Foundation; either version 2 of the License, or
  9  * (at your option) any later version.
 10  *
 11  * This program is distributed in the hope that it will be useful,
 12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  * GNU General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 19  *
 20  * Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>,
 21  *            and Ryusuke Konishi <ryusuke@osrg.net>.
 22  * Revised by Ryusuke Konishi <ryusuke@osrg.net>.
 23  *
 24  */
 25 /*
 26  * This file adds the cache of on-disk blocks to be moved in garbage
 27  * collection.  The disk blocks are held with dummy inodes (called
 28  * gcinodes), and this file provides lookup function of the dummy
 29  * inodes and their buffer read function.
 30  *
 31  * Buffers and pages held by the dummy inodes will be released each
 32  * time after they are copied to a new log.  Dirty blocks made on the
 33  * current generation and the blocks to be moved by GC never overlap
 34  * because the dirty blocks make a new generation; they rather must be
 35  * written individually.
 36  */
 37 
 38 #include <linux/buffer_head.h>
 39 #include <linux/mpage.h>
 40 #include <linux/hash.h>
 41 #include <linux/slab.h>
 42 #include <linux/swap.h>
 43 #include "nilfs.h"
 44 #include "btree.h"
 45 #include "btnode.h"
 46 #include "page.h"
 47 #include "mdt.h"
 48 #include "dat.h"
 49 #include "ifile.h"
 50 
 51 /*
 52  * nilfs_gccache_submit_read_data() - add data buffer and submit read request
 53  * @inode - gc inode
 54  * @blkoff - dummy offset treated as the key for the page cache
 55  * @pbn - physical block number of the block
 56  * @vbn - virtual block number of the block, 0 for non-virtual block
 57  * @out_bh - indirect pointer to a buffer_head struct to receive the results
 58  *
 59  * Description: nilfs_gccache_submit_read_data() registers the data buffer
 60  * specified by @pbn to the GC pagecache with the key @blkoff.
 61  * This function sets @vbn (@pbn if @vbn is zero) in b_blocknr of the buffer.
 62  *
 63  * Return Value: On success, 0 is returned. On Error, one of the following
 64  * negative error code is returned.
 65  *
 66  * %-EIO - I/O error.
 67  *
 68  * %-ENOMEM - Insufficient amount of memory available.
 69  *
 70  * %-ENOENT - The block specified with @pbn does not exist.
 71  */
 72 int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff,
 73                                    sector_t pbn, __u64 vbn,
 74                                    struct buffer_head **out_bh)
 75 {
 76         struct buffer_head *bh;
 77         int err;
 78 
 79         bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0);
 80         if (unlikely(!bh))
 81                 return -ENOMEM;
 82 
 83         if (buffer_uptodate(bh))
 84                 goto out;
 85 
 86         if (pbn == 0) {
 87                 struct the_nilfs *nilfs = inode->i_sb->s_fs_info;
 88 
 89                 err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn);
 90                 if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */
 91                         brelse(bh);
 92                         goto failed;
 93                 }
 94         }
 95 
 96         lock_buffer(bh);
 97         if (buffer_uptodate(bh)) {
 98                 unlock_buffer(bh);
 99                 goto out;
100         }
101 
102         if (!buffer_mapped(bh)) {
103                 bh->b_bdev = inode->i_sb->s_bdev;
104                 set_buffer_mapped(bh);
105         }
106         bh->b_blocknr = pbn;
107         bh->b_end_io = end_buffer_read_sync;
108         get_bh(bh);
109         submit_bh(READ, bh);
110         if (vbn)
111                 bh->b_blocknr = vbn;
112  out:
113         err = 0;
114         *out_bh = bh;
115 
116  failed:
117         unlock_page(bh->b_page);
118         put_page(bh->b_page);
119         return err;
120 }
121 
122 /*
123  * nilfs_gccache_submit_read_node() - add node buffer and submit read request
124  * @inode - gc inode
125  * @pbn - physical block number for the block
126  * @vbn - virtual block number for the block
127  * @out_bh - indirect pointer to a buffer_head struct to receive the results
128  *
129  * Description: nilfs_gccache_submit_read_node() registers the node buffer
130  * specified by @vbn to the GC pagecache.  @pbn can be supplied by the
131  * caller to avoid translation of the disk block address.
132  *
133  * Return Value: On success, 0 is returned. On Error, one of the following
134  * negative error code is returned.
135  *
136  * %-EIO - I/O error.
137  *
138  * %-ENOMEM - Insufficient amount of memory available.
139  */
140 int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn,
141                                    __u64 vbn, struct buffer_head **out_bh)
142 {
143         int ret;
144 
145         ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache,
146                                         vbn ? : pbn, pbn, READ, out_bh, &pbn);
147         if (ret == -EEXIST) /* internal code (cache hit) */
148                 ret = 0;
149         return ret;
150 }
151 
152 int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh)
153 {
154         wait_on_buffer(bh);
155         if (!buffer_uptodate(bh))
156                 return -EIO;
157         if (buffer_dirty(bh))
158                 return -EEXIST;
159 
160         if (buffer_nilfs_node(bh) && nilfs_btree_broken_node_block(bh)) {
161                 clear_buffer_uptodate(bh);
162                 return -EIO;
163         }
164         mark_buffer_dirty(bh);
165         return 0;
166 }
167 
168 int nilfs_init_gcinode(struct inode *inode)
169 {
170         struct nilfs_inode_info *ii = NILFS_I(inode);
171 
172         inode->i_mode = S_IFREG;
173         mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS);
174         inode->i_mapping->a_ops = &empty_aops;
175 
176         ii->i_flags = 0;
177         nilfs_bmap_init_gc(ii->i_bmap);
178 
179         return 0;
180 }
181 
182 /**
183  * nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes
184  */
185 void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs)
186 {
187         struct list_head *head = &nilfs->ns_gc_inodes;
188         struct nilfs_inode_info *ii;
189 
190         while (!list_empty(head)) {
191                 ii = list_first_entry(head, struct nilfs_inode_info, i_dirty);
192                 list_del_init(&ii->i_dirty);
193                 truncate_inode_pages(&ii->vfs_inode.i_data, 0);
194                 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
195                 iput(&ii->vfs_inode);
196         }
197 }
198 

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