page.h 2.6 KB

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  1. /*
  2. * page.h - buffer/page management specific to NILFS
  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 Ryusuke Konishi <ryusuke@osrg.net>,
  21. * Seiji Kihara <kihara@osrg.net>.
  22. */
  23. #ifndef _NILFS_PAGE_H
  24. #define _NILFS_PAGE_H
  25. #include <linux/buffer_head.h>
  26. #include "nilfs.h"
  27. /*
  28. * Extended buffer state bits
  29. */
  30. enum {
  31. BH_NILFS_Allocated = BH_PrivateStart,
  32. BH_NILFS_Node,
  33. BH_NILFS_Volatile,
  34. BH_NILFS_Checked,
  35. BH_NILFS_Redirected,
  36. };
  37. BUFFER_FNS(NILFS_Node, nilfs_node) /* nilfs node buffers */
  38. BUFFER_FNS(NILFS_Volatile, nilfs_volatile)
  39. BUFFER_FNS(NILFS_Checked, nilfs_checked) /* buffer is verified */
  40. BUFFER_FNS(NILFS_Redirected, nilfs_redirected) /* redirected to a copy */
  41. int __nilfs_clear_page_dirty(struct page *);
  42. struct buffer_head *nilfs_grab_buffer(struct inode *, struct address_space *,
  43. unsigned long, unsigned long);
  44. void nilfs_forget_buffer(struct buffer_head *);
  45. void nilfs_copy_buffer(struct buffer_head *, struct buffer_head *);
  46. int nilfs_page_buffers_clean(struct page *);
  47. void nilfs_page_bug(struct page *);
  48. int nilfs_copy_dirty_pages(struct address_space *, struct address_space *);
  49. void nilfs_copy_back_pages(struct address_space *, struct address_space *);
  50. void nilfs_clear_dirty_page(struct page *, bool);
  51. void nilfs_clear_dirty_pages(struct address_space *, bool);
  52. void nilfs_mapping_init(struct address_space *mapping, struct inode *inode);
  53. unsigned nilfs_page_count_clean_buffers(struct page *, unsigned, unsigned);
  54. unsigned long nilfs_find_uncommitted_extent(struct inode *inode,
  55. sector_t start_blk,
  56. sector_t *blkoff);
  57. #define NILFS_PAGE_BUG(page, m, a...) \
  58. do { nilfs_page_bug(page); BUG(); } while (0)
  59. static inline struct buffer_head *
  60. nilfs_page_get_nth_block(struct page *page, unsigned int count)
  61. {
  62. struct buffer_head *bh = page_buffers(page);
  63. while (count-- > 0)
  64. bh = bh->b_this_page;
  65. get_bh(bh);
  66. return bh;
  67. }
  68. #endif /* _NILFS_PAGE_H */