xfs_aops.h 2.4 KB

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  1. /*
  2. * Copyright (c) 2005-2006 Silicon Graphics, Inc.
  3. * All Rights Reserved.
  4. *
  5. * This program is free software; you can redistribute it and/or
  6. * modify it under the terms of the GNU General Public License as
  7. * published by the Free Software Foundation.
  8. *
  9. * This program is distributed in the hope that it would be useful,
  10. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  12. * GNU General Public License for more details.
  13. *
  14. * You should have received a copy of the GNU General Public License
  15. * along with this program; if not, write the Free Software Foundation,
  16. * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  17. */
  18. #ifndef __XFS_AOPS_H__
  19. #define __XFS_AOPS_H__
  20. extern mempool_t *xfs_ioend_pool;
  21. /*
  22. * Types of I/O for bmap clustering and I/O completion tracking.
  23. */
  24. enum {
  25. XFS_IO_DELALLOC, /* covers delalloc region */
  26. XFS_IO_UNWRITTEN, /* covers allocated but uninitialized data */
  27. XFS_IO_OVERWRITE, /* covers already allocated extent */
  28. };
  29. #define XFS_IO_TYPES \
  30. { XFS_IO_DELALLOC, "delalloc" }, \
  31. { XFS_IO_UNWRITTEN, "unwritten" }, \
  32. { XFS_IO_OVERWRITE, "overwrite" }
  33. /*
  34. * xfs_ioend struct manages large extent writes for XFS.
  35. * It can manage several multi-page bio's at once.
  36. */
  37. typedef struct xfs_ioend {
  38. struct xfs_ioend *io_list; /* next ioend in chain */
  39. unsigned int io_type; /* delalloc / unwritten */
  40. int io_error; /* I/O error code */
  41. atomic_t io_remaining; /* hold count */
  42. struct inode *io_inode; /* file being written to */
  43. struct buffer_head *io_buffer_head;/* buffer linked list head */
  44. struct buffer_head *io_buffer_tail;/* buffer linked list tail */
  45. size_t io_size; /* size of the extent */
  46. xfs_off_t io_offset; /* offset in the file */
  47. struct work_struct io_work; /* xfsdatad work queue */
  48. struct xfs_trans *io_append_trans;/* xact. for size update */
  49. } xfs_ioend_t;
  50. extern const struct address_space_operations xfs_address_space_operations;
  51. int xfs_get_blocks(struct inode *inode, sector_t offset,
  52. struct buffer_head *map_bh, int create);
  53. int xfs_get_blocks_direct(struct inode *inode, sector_t offset,
  54. struct buffer_head *map_bh, int create);
  55. int xfs_get_blocks_dax_fault(struct inode *inode, sector_t offset,
  56. struct buffer_head *map_bh, int create);
  57. extern void xfs_count_page_state(struct page *, int *, int *);
  58. #endif /* __XFS_AOPS_H__ */