xfs_rw.h 3.3 KB

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  1. /*
  2. * Copyright (c) 2000-2006 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_RW_H__
  19. #define __XFS_RW_H__
  20. struct xfs_buf;
  21. struct xfs_inode;
  22. struct xfs_mount;
  23. /*
  24. * Maximum count of bmaps used by read and write paths.
  25. */
  26. #define XFS_MAX_RW_NBMAPS 4
  27. /*
  28. * Counts of readahead buffers to use based on physical memory size.
  29. * None of these should be more than XFS_MAX_RW_NBMAPS.
  30. */
  31. #define XFS_RW_NREADAHEAD_16MB 2
  32. #define XFS_RW_NREADAHEAD_32MB 3
  33. #define XFS_RW_NREADAHEAD_K32 4
  34. #define XFS_RW_NREADAHEAD_K64 4
  35. /*
  36. * Maximum size of a buffer that we\'ll map. Making this
  37. * too big will degrade performance due to the number of
  38. * pages which need to be gathered. Making it too small
  39. * will prevent us from doing large I/O\'s to hardware that
  40. * needs it.
  41. *
  42. * This is currently set to 512 KB.
  43. */
  44. #define XFS_MAX_BMAP_LEN_BB 1024
  45. #define XFS_MAX_BMAP_LEN_BYTES 524288
  46. /*
  47. * Convert the given file system block to a disk block.
  48. * We have to treat it differently based on whether the
  49. * file is a real time file or not, because the bmap code
  50. * does.
  51. */
  52. #define XFS_FSB_TO_DB(ip,fsb) xfs_fsb_to_db(ip,fsb)
  53. static inline xfs_daddr_t
  54. xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
  55. {
  56. return (((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME) ? \
  57. (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
  58. XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
  59. }
  60. #define XFS_FSB_TO_DB_IO(io,fsb) xfs_fsb_to_db_io(io,fsb)
  61. static inline xfs_daddr_t
  62. xfs_fsb_to_db_io(struct xfs_iocore *io, xfs_fsblock_t fsb)
  63. {
  64. return (((io)->io_flags & XFS_IOCORE_RT) ? \
  65. XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
  66. XFS_FSB_TO_DADDR((io)->io_mount, (fsb)));
  67. }
  68. /*
  69. * Prototypes for functions in xfs_rw.c.
  70. */
  71. extern int xfs_write_clear_setuid(struct xfs_inode *ip);
  72. extern int xfs_write_sync_logforce(struct xfs_mount *mp, struct xfs_inode *ip);
  73. extern int xfs_bwrite(struct xfs_mount *mp, struct xfs_buf *bp);
  74. extern int xfs_bioerror(struct xfs_buf *bp);
  75. extern int xfs_bioerror_relse(struct xfs_buf *bp);
  76. extern int xfs_read_buf(struct xfs_mount *mp, xfs_buftarg_t *btp,
  77. xfs_daddr_t blkno, int len, uint flags,
  78. struct xfs_buf **bpp);
  79. extern void xfs_ioerror_alert(char *func, struct xfs_mount *mp,
  80. xfs_buf_t *bp, xfs_daddr_t blkno);
  81. /*
  82. * Prototypes for functions in xfs_vnodeops.c.
  83. */
  84. extern int xfs_rwlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
  85. extern void xfs_rwunlock(bhv_desc_t *bdp, bhv_vrwlock_t write_lock);
  86. extern int xfs_setattr(bhv_desc_t *, bhv_vattr_t *vap, int flags,
  87. cred_t *credp);
  88. extern int xfs_change_file_space(bhv_desc_t *bdp, int cmd, xfs_flock64_t *bf,
  89. xfs_off_t offset, cred_t *credp, int flags);
  90. extern int xfs_set_dmattrs(bhv_desc_t *bdp, u_int evmask, u_int16_t state,
  91. cred_t *credp);
  92. #endif /* __XFS_RW_H__ */