xfs_rtalloc.h 5.1 KB

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  1. /*
  2. * Copyright (c) 2000-2003,2005 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_RTALLOC_H__
  19. #define __XFS_RTALLOC_H__
  20. struct xfs_mount;
  21. struct xfs_trans;
  22. #define XFS_IS_REALTIME_INODE(ip) ((ip)->i_d.di_flags & XFS_DIFLAG_REALTIME)
  23. /* Min and max rt extent sizes, specified in bytes */
  24. #define XFS_MAX_RTEXTSIZE (1024 * 1024 * 1024) /* 1GB */
  25. #define XFS_DFL_RTEXTSIZE (64 * 1024) /* 64KB */
  26. #define XFS_MIN_RTEXTSIZE (4 * 1024) /* 4KB */
  27. /*
  28. * Constants for bit manipulations.
  29. */
  30. #define XFS_NBBYLOG 3 /* log2(NBBY) */
  31. #define XFS_WORDLOG 2 /* log2(sizeof(xfs_rtword_t)) */
  32. #define XFS_NBWORDLOG (XFS_NBBYLOG + XFS_WORDLOG)
  33. #define XFS_NBWORD (1 << XFS_NBWORDLOG)
  34. #define XFS_WORDMASK ((1 << XFS_WORDLOG) - 1)
  35. #define XFS_BLOCKSIZE(mp) ((mp)->m_sb.sb_blocksize)
  36. #define XFS_BLOCKMASK(mp) ((mp)->m_blockmask)
  37. #define XFS_BLOCKWSIZE(mp) ((mp)->m_blockwsize)
  38. #define XFS_BLOCKWMASK(mp) ((mp)->m_blockwmask)
  39. /*
  40. * Summary and bit manipulation macros.
  41. */
  42. #define XFS_SUMOFFS(mp,ls,bb) ((int)((ls) * (mp)->m_sb.sb_rbmblocks + (bb)))
  43. #define XFS_SUMOFFSTOBLOCK(mp,s) \
  44. (((s) * (uint)sizeof(xfs_suminfo_t)) >> (mp)->m_sb.sb_blocklog)
  45. #define XFS_SUMPTR(mp,bp,so) \
  46. ((xfs_suminfo_t *)((char *)XFS_BUF_PTR(bp) + \
  47. (((so) * (uint)sizeof(xfs_suminfo_t)) & XFS_BLOCKMASK(mp))))
  48. #define XFS_BITTOBLOCK(mp,bi) ((bi) >> (mp)->m_blkbit_log)
  49. #define XFS_BLOCKTOBIT(mp,bb) ((bb) << (mp)->m_blkbit_log)
  50. #define XFS_BITTOWORD(mp,bi) \
  51. ((int)(((bi) >> XFS_NBWORDLOG) & XFS_BLOCKWMASK(mp)))
  52. #define XFS_RTMIN(a,b) ((a) < (b) ? (a) : (b))
  53. #define XFS_RTMAX(a,b) ((a) > (b) ? (a) : (b))
  54. #define XFS_RTLOBIT(w) xfs_lowbit32(w)
  55. #define XFS_RTHIBIT(w) xfs_highbit32(w)
  56. #if XFS_BIG_BLKNOS
  57. #define XFS_RTBLOCKLOG(b) xfs_highbit64(b)
  58. #else
  59. #define XFS_RTBLOCKLOG(b) xfs_highbit32(b)
  60. #endif
  61. #ifdef __KERNEL__
  62. #ifdef CONFIG_XFS_RT
  63. /*
  64. * Function prototypes for exported functions.
  65. */
  66. /*
  67. * Allocate an extent in the realtime subvolume, with the usual allocation
  68. * parameters. The length units are all in realtime extents, as is the
  69. * result block number.
  70. */
  71. int /* error */
  72. xfs_rtallocate_extent(
  73. struct xfs_trans *tp, /* transaction pointer */
  74. xfs_rtblock_t bno, /* starting block number to allocate */
  75. xfs_extlen_t minlen, /* minimum length to allocate */
  76. xfs_extlen_t maxlen, /* maximum length to allocate */
  77. xfs_extlen_t *len, /* out: actual length allocated */
  78. xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
  79. int wasdel, /* was a delayed allocation extent */
  80. xfs_extlen_t prod, /* extent product factor */
  81. xfs_rtblock_t *rtblock); /* out: start block allocated */
  82. /*
  83. * Free an extent in the realtime subvolume. Length is expressed in
  84. * realtime extents, as is the block number.
  85. */
  86. int /* error */
  87. xfs_rtfree_extent(
  88. struct xfs_trans *tp, /* transaction pointer */
  89. xfs_rtblock_t bno, /* starting block number to free */
  90. xfs_extlen_t len); /* length of extent freed */
  91. /*
  92. * Initialize realtime fields in the mount structure.
  93. */
  94. int /* error */
  95. xfs_rtmount_init(
  96. struct xfs_mount *mp); /* file system mount structure */
  97. /*
  98. * Get the bitmap and summary inodes into the mount structure
  99. * at mount time.
  100. */
  101. int /* error */
  102. xfs_rtmount_inodes(
  103. struct xfs_mount *mp); /* file system mount structure */
  104. /*
  105. * Pick an extent for allocation at the start of a new realtime file.
  106. * Use the sequence number stored in the atime field of the bitmap inode.
  107. * Translate this to a fraction of the rtextents, and return the product
  108. * of rtextents and the fraction.
  109. * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
  110. */
  111. int /* error */
  112. xfs_rtpick_extent(
  113. struct xfs_mount *mp, /* file system mount point */
  114. struct xfs_trans *tp, /* transaction pointer */
  115. xfs_extlen_t len, /* allocation length (rtextents) */
  116. xfs_rtblock_t *pick); /* result rt extent */
  117. /*
  118. * Grow the realtime area of the filesystem.
  119. */
  120. int
  121. xfs_growfs_rt(
  122. struct xfs_mount *mp, /* file system mount structure */
  123. xfs_growfs_rt_t *in); /* user supplied growfs struct */
  124. #else
  125. # define xfs_rtallocate_extent(t,b,min,max,l,a,f,p,rb) (ENOSYS)
  126. # define xfs_rtfree_extent(t,b,l) (ENOSYS)
  127. # define xfs_rtpick_extent(m,t,l,rb) (ENOSYS)
  128. # define xfs_growfs_rt(mp,in) (ENOSYS)
  129. # define xfs_rtmount_init(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
  130. # define xfs_rtmount_inodes(m) (((mp)->m_sb.sb_rblocks == 0)? 0 : (ENOSYS))
  131. #endif /* CONFIG_XFS_RT */
  132. #endif /* __KERNEL__ */
  133. #endif /* __XFS_RTALLOC_H__ */