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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-09-05 23:05:43 -0400
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2010-10-22 20:24:37 -0400
commitebdfed4dc59d177cf26013a0c9b8ee9652e9a140 (patch)
tree6ef90f068ae41c55234181c93d8e30a303126c43 /fs/nilfs2/page.h
parenta8070dd365dd995f6139a2fc3aeee10159bdcc45 (diff)
nilfs2: add routines to roll back state of DAT file
This adds optional function to metadata files which makes a copy of bmap, page caches, and b-tree node cache, and rolls back to the copy as needed. This enhancement is intended to displace gcdat inode that provides a similar function in a different way. In this patch, nilfs_shadow_map structure is added to store a copy of the foregoing states. nilfs_mdt_setup_shadow_map relates this structure to a metadata file. And, nilfs_mdt_save_to_shadow_map() and nilfs_mdt_restore_from_shadow_map() provides save and restore functions respectively. Finally, nilfs_mdt_clear_shadow_map() clears states of nilfs_shadow_map. The copy of b-tree node cache and page cache is made by duplicating only dirty pages into corresponding caches in nilfs_shadow_map. Their restoration is done by clearing dirty pages from original caches and by copying dirty pages back from nilfs_shadow_map. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/page.h')
-rw-r--r--fs/nilfs2/page.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h
index f53d8da41ed7..6ec4f498fc2b 100644
--- a/fs/nilfs2/page.h
+++ b/fs/nilfs2/page.h
@@ -59,6 +59,10 @@ void nilfs_free_private_page(struct page *);
59int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); 59int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
60void nilfs_copy_back_pages(struct address_space *, struct address_space *); 60void nilfs_copy_back_pages(struct address_space *, struct address_space *);
61void nilfs_clear_dirty_pages(struct address_space *); 61void nilfs_clear_dirty_pages(struct address_space *);
62void nilfs_mapping_init_once(struct address_space *mapping);
63void nilfs_mapping_init(struct address_space *mapping,
64 struct backing_dev_info *bdi,
65 const struct address_space_operations *aops);
62unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned); 66unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
63 67
64#define NILFS_PAGE_BUG(page, m, a...) \ 68#define NILFS_PAGE_BUG(page, m, a...) \