xfs_alloc.h 6.9 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211
  1. /*
  2. * Copyright (c) 2000-2002,2005 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_ALLOC_H__
  19. #define __XFS_ALLOC_H__
  20. struct xfs_buf;
  21. struct xfs_mount;
  22. struct xfs_perag;
  23. struct xfs_trans;
  24. /*
  25. * Freespace allocation types. Argument to xfs_alloc_[v]extent.
  26. */
  27. typedef enum xfs_alloctype
  28. {
  29. XFS_ALLOCTYPE_ANY_AG, /* allocate anywhere, use rotor */
  30. XFS_ALLOCTYPE_FIRST_AG, /* ... start at ag 0 */
  31. XFS_ALLOCTYPE_START_AG, /* anywhere, start in this a.g. */
  32. XFS_ALLOCTYPE_THIS_AG, /* anywhere in this a.g. */
  33. XFS_ALLOCTYPE_START_BNO, /* near this block else anywhere */
  34. XFS_ALLOCTYPE_NEAR_BNO, /* in this a.g. and near this block */
  35. XFS_ALLOCTYPE_THIS_BNO /* at exactly this block */
  36. } xfs_alloctype_t;
  37. /*
  38. * Flags for xfs_alloc_fix_freelist.
  39. */
  40. #define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
  41. #define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
  42. /*
  43. * In order to avoid ENOSPC-related deadlock caused by
  44. * out-of-order locking of AGF buffer (PV 947395), we place
  45. * constraints on the relationship among actual allocations for
  46. * data blocks, freelist blocks, and potential file data bmap
  47. * btree blocks. However, these restrictions may result in no
  48. * actual space allocated for a delayed extent, for example, a data
  49. * block in a certain AG is allocated but there is no additional
  50. * block for the additional bmap btree block due to a split of the
  51. * bmap btree of the file. The result of this may lead to an
  52. * infinite loop in xfssyncd when the file gets flushed to disk and
  53. * all delayed extents need to be actually allocated. To get around
  54. * this, we explicitly set aside a few blocks which will not be
  55. * reserved in delayed allocation. Considering the minimum number of
  56. * needed freelist blocks is 4 fsbs _per AG_, a potential split of file's bmap
  57. * btree requires 1 fsb, so we set the number of set-aside blocks
  58. * to 4 + 4*agcount.
  59. */
  60. #define XFS_ALLOC_SET_ASIDE(mp) (4 + ((mp)->m_sb.sb_agcount * 4))
  61. /*
  62. * Argument structure for xfs_alloc routines.
  63. * This is turned into a structure to avoid having 20 arguments passed
  64. * down several levels of the stack.
  65. */
  66. typedef struct xfs_alloc_arg {
  67. struct xfs_trans *tp; /* transaction pointer */
  68. struct xfs_mount *mp; /* file system mount point */
  69. struct xfs_buf *agbp; /* buffer for a.g. freelist header */
  70. struct xfs_perag *pag; /* per-ag struct for this agno */
  71. xfs_fsblock_t fsbno; /* file system block number */
  72. xfs_agnumber_t agno; /* allocation group number */
  73. xfs_agblock_t agbno; /* allocation group-relative block # */
  74. xfs_extlen_t minlen; /* minimum size of extent */
  75. xfs_extlen_t maxlen; /* maximum size of extent */
  76. xfs_extlen_t mod; /* mod value for extent size */
  77. xfs_extlen_t prod; /* prod value for extent size */
  78. xfs_extlen_t minleft; /* min blocks must be left after us */
  79. xfs_extlen_t total; /* total blocks needed in xaction */
  80. xfs_extlen_t alignment; /* align answer to multiple of this */
  81. xfs_extlen_t minalignslop; /* slop for minlen+alignment calcs */
  82. xfs_extlen_t len; /* output: actual size of extent */
  83. xfs_alloctype_t type; /* allocation type XFS_ALLOCTYPE_... */
  84. xfs_alloctype_t otype; /* original allocation type */
  85. char wasdel; /* set if allocation was prev delayed */
  86. char wasfromfl; /* set if allocation is from freelist */
  87. char isfl; /* set if is freelist blocks - !acctg */
  88. char userdata; /* set if this is user data */
  89. xfs_fsblock_t firstblock; /* io first block allocated */
  90. } xfs_alloc_arg_t;
  91. /*
  92. * Defines for userdata
  93. */
  94. #define XFS_ALLOC_USERDATA 1 /* allocation is for user data*/
  95. #define XFS_ALLOC_INITIAL_USER_DATA 2 /* special case start of file */
  96. #ifdef __KERNEL__
  97. #if defined(XFS_ALLOC_TRACE)
  98. /*
  99. * Allocation tracing buffer size.
  100. */
  101. #define XFS_ALLOC_TRACE_SIZE 4096
  102. extern ktrace_t *xfs_alloc_trace_buf;
  103. /*
  104. * Types for alloc tracing.
  105. */
  106. #define XFS_ALLOC_KTRACE_ALLOC 1
  107. #define XFS_ALLOC_KTRACE_FREE 2
  108. #define XFS_ALLOC_KTRACE_MODAGF 3
  109. #define XFS_ALLOC_KTRACE_BUSY 4
  110. #define XFS_ALLOC_KTRACE_UNBUSY 5
  111. #define XFS_ALLOC_KTRACE_BUSYSEARCH 6
  112. #endif
  113. /*
  114. * Compute and fill in value of m_ag_maxlevels.
  115. */
  116. void
  117. xfs_alloc_compute_maxlevels(
  118. struct xfs_mount *mp); /* file system mount structure */
  119. /*
  120. * Get a block from the freelist.
  121. * Returns with the buffer for the block gotten.
  122. */
  123. int /* error */
  124. xfs_alloc_get_freelist(
  125. struct xfs_trans *tp, /* transaction pointer */
  126. struct xfs_buf *agbp, /* buffer containing the agf structure */
  127. xfs_agblock_t *bnop); /* block address retrieved from freelist */
  128. /*
  129. * Log the given fields from the agf structure.
  130. */
  131. void
  132. xfs_alloc_log_agf(
  133. struct xfs_trans *tp, /* transaction pointer */
  134. struct xfs_buf *bp, /* buffer for a.g. freelist header */
  135. int fields);/* mask of fields to be logged (XFS_AGF_...) */
  136. /*
  137. * Interface for inode allocation to force the pag data to be initialized.
  138. */
  139. int /* error */
  140. xfs_alloc_pagf_init(
  141. struct xfs_mount *mp, /* file system mount structure */
  142. struct xfs_trans *tp, /* transaction pointer */
  143. xfs_agnumber_t agno, /* allocation group number */
  144. int flags); /* XFS_ALLOC_FLAGS_... */
  145. /*
  146. * Put the block on the freelist for the allocation group.
  147. */
  148. int /* error */
  149. xfs_alloc_put_freelist(
  150. struct xfs_trans *tp, /* transaction pointer */
  151. struct xfs_buf *agbp, /* buffer for a.g. freelist header */
  152. struct xfs_buf *agflbp,/* buffer for a.g. free block array */
  153. xfs_agblock_t bno); /* block being freed */
  154. /*
  155. * Read in the allocation group header (free/alloc section).
  156. */
  157. int /* error */
  158. xfs_alloc_read_agf(
  159. struct xfs_mount *mp, /* mount point structure */
  160. struct xfs_trans *tp, /* transaction pointer */
  161. xfs_agnumber_t agno, /* allocation group number */
  162. int flags, /* XFS_ALLOC_FLAG_... */
  163. struct xfs_buf **bpp); /* buffer for the ag freelist header */
  164. /*
  165. * Allocate an extent (variable-size).
  166. */
  167. int /* error */
  168. xfs_alloc_vextent(
  169. xfs_alloc_arg_t *args); /* allocation argument structure */
  170. /*
  171. * Free an extent.
  172. */
  173. int /* error */
  174. xfs_free_extent(
  175. struct xfs_trans *tp, /* transaction pointer */
  176. xfs_fsblock_t bno, /* starting block number of extent */
  177. xfs_extlen_t len); /* length of extent */
  178. void
  179. xfs_alloc_mark_busy(xfs_trans_t *tp,
  180. xfs_agnumber_t agno,
  181. xfs_agblock_t bno,
  182. xfs_extlen_t len);
  183. void
  184. xfs_alloc_clear_busy(xfs_trans_t *tp,
  185. xfs_agnumber_t ag,
  186. int idx);
  187. #endif /* __KERNEL__ */
  188. #endif /* __XFS_ALLOC_H__ */