xfs_dquot.h 5.5 KB

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  1. /*
  2. * Copyright (c) 2000-2005 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_DQUOT_H__
  19. #define __XFS_DQUOT_H__
  20. /*
  21. * Dquots are structures that hold quota information about a user or a group,
  22. * much like inodes are for files. In fact, dquots share many characteristics
  23. * with inodes. However, dquots can also be a centralized resource, relative
  24. * to a collection of inodes. In this respect, dquots share some characteristics
  25. * of the superblock.
  26. * XFS dquots exploit both those in its algorithms. They make every attempt
  27. * to not be a bottleneck when quotas are on and have minimal impact, if any,
  28. * when quotas are off.
  29. */
  30. struct xfs_mount;
  31. struct xfs_trans;
  32. enum {
  33. XFS_QLOWSP_1_PCNT = 0,
  34. XFS_QLOWSP_3_PCNT,
  35. XFS_QLOWSP_5_PCNT,
  36. XFS_QLOWSP_MAX
  37. };
  38. /*
  39. * The incore dquot structure
  40. */
  41. typedef struct xfs_dquot {
  42. uint dq_flags; /* various flags (XFS_DQ_*) */
  43. struct list_head q_lru; /* global free list of dquots */
  44. struct xfs_mount*q_mount; /* filesystem this relates to */
  45. struct xfs_trans*q_transp; /* trans this belongs to currently */
  46. uint q_nrefs; /* # active refs from inodes */
  47. xfs_daddr_t q_blkno; /* blkno of dquot buffer */
  48. int q_bufoffset; /* off of dq in buffer (# dquots) */
  49. xfs_fileoff_t q_fileoffset; /* offset in quotas file */
  50. xfs_disk_dquot_t q_core; /* actual usage & quotas */
  51. xfs_dq_logitem_t q_logitem; /* dquot log item */
  52. xfs_qcnt_t q_res_bcount; /* total regular nblks used+reserved */
  53. xfs_qcnt_t q_res_icount; /* total inos allocd+reserved */
  54. xfs_qcnt_t q_res_rtbcount;/* total realtime blks used+reserved */
  55. xfs_qcnt_t q_prealloc_lo_wmark;/* prealloc throttle wmark */
  56. xfs_qcnt_t q_prealloc_hi_wmark;/* prealloc disabled wmark */
  57. int64_t q_low_space[XFS_QLOWSP_MAX];
  58. struct mutex q_qlock; /* quota lock */
  59. struct completion q_flush; /* flush completion queue */
  60. atomic_t q_pincount; /* dquot pin count */
  61. wait_queue_head_t q_pinwait; /* dquot pinning wait queue */
  62. } xfs_dquot_t;
  63. /*
  64. * Lock hierarchy for q_qlock:
  65. * XFS_QLOCK_NORMAL is the implicit default,
  66. * XFS_QLOCK_NESTED is the dquot with the higher id in xfs_dqlock2
  67. */
  68. enum {
  69. XFS_QLOCK_NORMAL = 0,
  70. XFS_QLOCK_NESTED,
  71. };
  72. /*
  73. * Manage the q_flush completion queue embedded in the dquot. This completion
  74. * queue synchronizes processes attempting to flush the in-core dquot back to
  75. * disk.
  76. */
  77. static inline void xfs_dqflock(xfs_dquot_t *dqp)
  78. {
  79. wait_for_completion(&dqp->q_flush);
  80. }
  81. static inline bool xfs_dqflock_nowait(xfs_dquot_t *dqp)
  82. {
  83. return try_wait_for_completion(&dqp->q_flush);
  84. }
  85. static inline void xfs_dqfunlock(xfs_dquot_t *dqp)
  86. {
  87. complete(&dqp->q_flush);
  88. }
  89. static inline int xfs_dqlock_nowait(struct xfs_dquot *dqp)
  90. {
  91. return mutex_trylock(&dqp->q_qlock);
  92. }
  93. static inline void xfs_dqlock(struct xfs_dquot *dqp)
  94. {
  95. mutex_lock(&dqp->q_qlock);
  96. }
  97. static inline void xfs_dqunlock(struct xfs_dquot *dqp)
  98. {
  99. mutex_unlock(&dqp->q_qlock);
  100. }
  101. static inline int xfs_this_quota_on(struct xfs_mount *mp, int type)
  102. {
  103. switch (type & XFS_DQ_ALLTYPES) {
  104. case XFS_DQ_USER:
  105. return XFS_IS_UQUOTA_ON(mp);
  106. case XFS_DQ_GROUP:
  107. return XFS_IS_GQUOTA_ON(mp);
  108. case XFS_DQ_PROJ:
  109. return XFS_IS_PQUOTA_ON(mp);
  110. default:
  111. return 0;
  112. }
  113. }
  114. static inline xfs_dquot_t *xfs_inode_dquot(struct xfs_inode *ip, int type)
  115. {
  116. switch (type & XFS_DQ_ALLTYPES) {
  117. case XFS_DQ_USER:
  118. return ip->i_udquot;
  119. case XFS_DQ_GROUP:
  120. return ip->i_gdquot;
  121. case XFS_DQ_PROJ:
  122. return ip->i_pdquot;
  123. default:
  124. return NULL;
  125. }
  126. }
  127. /*
  128. * Check whether a dquot is under low free space conditions. We assume the quota
  129. * is enabled and enforced.
  130. */
  131. static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
  132. {
  133. int64_t freesp;
  134. freesp = be64_to_cpu(dqp->q_core.d_blk_hardlimit) - dqp->q_res_bcount;
  135. if (freesp < dqp->q_low_space[XFS_QLOWSP_1_PCNT])
  136. return true;
  137. return false;
  138. }
  139. #define XFS_DQ_IS_LOCKED(dqp) (mutex_is_locked(&((dqp)->q_qlock)))
  140. #define XFS_DQ_IS_DIRTY(dqp) ((dqp)->dq_flags & XFS_DQ_DIRTY)
  141. #define XFS_QM_ISUDQ(dqp) ((dqp)->dq_flags & XFS_DQ_USER)
  142. #define XFS_QM_ISPDQ(dqp) ((dqp)->dq_flags & XFS_DQ_PROJ)
  143. #define XFS_QM_ISGDQ(dqp) ((dqp)->dq_flags & XFS_DQ_GROUP)
  144. extern int xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
  145. uint, struct xfs_dquot **);
  146. extern void xfs_qm_dqdestroy(xfs_dquot_t *);
  147. extern int xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
  148. extern void xfs_qm_dqunpin_wait(xfs_dquot_t *);
  149. extern void xfs_qm_adjust_dqtimers(xfs_mount_t *,
  150. xfs_disk_dquot_t *);
  151. extern void xfs_qm_adjust_dqlimits(struct xfs_mount *,
  152. struct xfs_dquot *);
  153. extern int xfs_qm_dqget(xfs_mount_t *, xfs_inode_t *,
  154. xfs_dqid_t, uint, uint, xfs_dquot_t **);
  155. extern void xfs_qm_dqput(xfs_dquot_t *);
  156. extern void xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
  157. extern void xfs_dquot_set_prealloc_limits(struct xfs_dquot *);
  158. static inline struct xfs_dquot *xfs_qm_dqhold(struct xfs_dquot *dqp)
  159. {
  160. xfs_dqlock(dqp);
  161. dqp->q_nrefs++;
  162. xfs_dqunlock(dqp);
  163. return dqp;
  164. }
  165. #endif /* __XFS_DQUOT_H__ */