diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nilfs2/gcinode.c')
| -rw-r--r-- | ANDROID_3.4.5/fs/nilfs2/gcinode.c | 198 |
1 files changed, 0 insertions, 198 deletions
diff --git a/ANDROID_3.4.5/fs/nilfs2/gcinode.c b/ANDROID_3.4.5/fs/nilfs2/gcinode.c deleted file mode 100644 index 57ceaf33..00000000 --- a/ANDROID_3.4.5/fs/nilfs2/gcinode.c +++ /dev/null @@ -1,198 +0,0 @@ -/* - * gcinode.c - dummy inodes to buffer blocks for garbage collection - * - * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * - * Written by Seiji Kihara <kihara@osrg.net>, Amagai Yoshiji <amagai@osrg.net>, - * and Ryusuke Konishi <ryusuke@osrg.net>. - * Revised by Ryusuke Konishi <ryusuke@osrg.net>. - * - */ -/* - * This file adds the cache of on-disk blocks to be moved in garbage - * collection. The disk blocks are held with dummy inodes (called - * gcinodes), and this file provides lookup function of the dummy - * inodes and their buffer read function. - * - * Buffers and pages held by the dummy inodes will be released each - * time after they are copied to a new log. Dirty blocks made on the - * current generation and the blocks to be moved by GC never overlap - * because the dirty blocks make a new generation; they rather must be - * written individually. - */ - -#include <linux/buffer_head.h> -#include <linux/mpage.h> -#include <linux/hash.h> -#include <linux/slab.h> -#include <linux/swap.h> -#include "nilfs.h" -#include "btree.h" -#include "btnode.h" -#include "page.h" -#include "mdt.h" -#include "dat.h" -#include "ifile.h" - -/* - * nilfs_gccache_submit_read_data() - add data buffer and submit read request - * @inode - gc inode - * @blkoff - dummy offset treated as the key for the page cache - * @pbn - physical block number of the block - * @vbn - virtual block number of the block, 0 for non-virtual block - * @out_bh - indirect pointer to a buffer_head struct to receive the results - * - * Description: nilfs_gccache_submit_read_data() registers the data buffer - * specified by @pbn to the GC pagecache with the key @blkoff. - * This function sets @vbn (@pbn if @vbn is zero) in b_blocknr of the buffer. - * - * Return Value: On success, 0 is returned. On Error, one of the following - * negative error code is returned. - * - * %-EIO - I/O error. - * - * %-ENOMEM - Insufficient amount of memory available. - * - * %-ENOENT - The block specified with @pbn does not exist. - */ -int nilfs_gccache_submit_read_data(struct inode *inode, sector_t blkoff, - sector_t pbn, __u64 vbn, - struct buffer_head **out_bh) -{ - struct buffer_head *bh; - int err; - - bh = nilfs_grab_buffer(inode, inode->i_mapping, blkoff, 0); - if (unlikely(!bh)) - return -ENOMEM; - - if (buffer_uptodate(bh)) - goto out; - - if (pbn == 0) { - struct the_nilfs *nilfs = inode->i_sb->s_fs_info; - - err = nilfs_dat_translate(nilfs->ns_dat, vbn, &pbn); - if (unlikely(err)) { /* -EIO, -ENOMEM, -ENOENT */ - brelse(bh); - goto failed; - } - } - - lock_buffer(bh); - if (buffer_uptodate(bh)) { - unlock_buffer(bh); - goto out; - } - - if (!buffer_mapped(bh)) { - bh->b_bdev = inode->i_sb->s_bdev; - set_buffer_mapped(bh); - } - bh->b_blocknr = pbn; - bh->b_end_io = end_buffer_read_sync; - get_bh(bh); - submit_bh(READ, bh); - if (vbn) - bh->b_blocknr = vbn; - out: - err = 0; - *out_bh = bh; - - failed: - unlock_page(bh->b_page); - page_cache_release(bh->b_page); - return err; -} - -/* - * nilfs_gccache_submit_read_node() - add node buffer and submit read request - * @inode - gc inode - * @pbn - physical block number for the block - * @vbn - virtual block number for the block - * @out_bh - indirect pointer to a buffer_head struct to receive the results - * - * Description: nilfs_gccache_submit_read_node() registers the node buffer - * specified by @vbn to the GC pagecache. @pbn can be supplied by the - * caller to avoid translation of the disk block address. - * - * Return Value: On success, 0 is returned. On Error, one of the following - * negative error code is returned. - * - * %-EIO - I/O error. - * - * %-ENOMEM - Insufficient amount of memory available. - */ -int nilfs_gccache_submit_read_node(struct inode *inode, sector_t pbn, - __u64 vbn, struct buffer_head **out_bh) -{ - int ret; - - ret = nilfs_btnode_submit_block(&NILFS_I(inode)->i_btnode_cache, - vbn ? : pbn, pbn, READ, out_bh, &pbn); - if (ret == -EEXIST) /* internal code (cache hit) */ - ret = 0; - return ret; -} - -int nilfs_gccache_wait_and_mark_dirty(struct buffer_head *bh) -{ - wait_on_buffer(bh); - if (!buffer_uptodate(bh)) - return -EIO; - if (buffer_dirty(bh)) - return -EEXIST; - - if (buffer_nilfs_node(bh) && nilfs_btree_broken_node_block(bh)) { - clear_buffer_uptodate(bh); - return -EIO; - } - mark_buffer_dirty(bh); - return 0; -} - -int nilfs_init_gcinode(struct inode *inode) -{ - struct nilfs_inode_info *ii = NILFS_I(inode); - - inode->i_mode = S_IFREG; - mapping_set_gfp_mask(inode->i_mapping, GFP_NOFS); - inode->i_mapping->a_ops = &empty_aops; - inode->i_mapping->backing_dev_info = inode->i_sb->s_bdi; - - ii->i_flags = 0; - nilfs_bmap_init_gc(ii->i_bmap); - - return 0; -} - -/** - * nilfs_remove_all_gcinodes() - remove all unprocessed gc inodes - */ -void nilfs_remove_all_gcinodes(struct the_nilfs *nilfs) -{ - struct list_head *head = &nilfs->ns_gc_inodes; - struct nilfs_inode_info *ii; - - while (!list_empty(head)) { - ii = list_first_entry(head, struct nilfs_inode_info, i_dirty); - list_del_init(&ii->i_dirty); - truncate_inode_pages(&ii->vfs_inode.i_data, 0); - nilfs_btnode_cache_clear(&ii->i_btnode_cache); - iput(&ii->vfs_inode); - } -} |