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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-09-06 07:05:43 +0400 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-10-23 04:24:37 +0400 |
| commit | ebdfed4dc59d177cf26013a0c9b8ee9652e9a140 (patch) | |
| tree | 6ef90f068ae41c55234181c93d8e30a303126c43 /fs/nilfs2/page.h | |
| parent | a8070dd365dd995f6139a2fc3aeee10159bdcc45 (diff) | |
| download | linux-ebdfed4dc59d177cf26013a0c9b8ee9652e9a140.tar.xz | |
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.h | 4 |
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 *); int nilfs_copy_dirty_pages(struct address_space *, struct address_space *); void nilfs_copy_back_pages(struct address_space *, struct address_space *); void nilfs_clear_dirty_pages(struct address_space *); +void nilfs_mapping_init_once(struct address_space *mapping); +void nilfs_mapping_init(struct address_space *mapping, + struct backing_dev_info *bdi, + const struct address_space_operations *aops); unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned); #define NILFS_PAGE_BUG(page, m, a...) \ |