quota.h 4.6 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. /*
  3. * quota.h for OCFS2
  4. *
  5. * On disk quota structures for local and global quota file, in-memory
  6. * structures.
  7. *
  8. */
  9. #ifndef _OCFS2_QUOTA_H
  10. #define _OCFS2_QUOTA_H
  11. #include <linux/types.h>
  12. #include <linux/slab.h>
  13. #include <linux/quota.h>
  14. #include <linux/list.h>
  15. #include <linux/dqblk_qtree.h>
  16. #include "ocfs2.h"
  17. /* Number of quota types we support */
  18. #define OCFS2_MAXQUOTAS 2
  19. /*
  20. * In-memory structures
  21. */
  22. struct ocfs2_dquot {
  23. struct dquot dq_dquot; /* Generic VFS dquot */
  24. loff_t dq_local_off; /* Offset in the local quota file */
  25. u64 dq_local_phys_blk; /* Physical block carrying quota structure */
  26. struct ocfs2_quota_chunk *dq_chunk; /* Chunk dquot is in */
  27. unsigned int dq_use_count; /* Number of nodes having reference to this entry in global quota file */
  28. s64 dq_origspace; /* Last globally synced space usage */
  29. s64 dq_originodes; /* Last globally synced inode usage */
  30. struct llist_node list; /* Member of list of dquots to drop */
  31. };
  32. /* Description of one chunk to recover in memory */
  33. struct ocfs2_recovery_chunk {
  34. struct list_head rc_list; /* List of chunks */
  35. int rc_chunk; /* Chunk number */
  36. unsigned long *rc_bitmap; /* Bitmap of entries to recover */
  37. };
  38. struct ocfs2_quota_recovery {
  39. struct list_head r_list[OCFS2_MAXQUOTAS]; /* List of chunks to recover */
  40. };
  41. /* In-memory structure with quota header information */
  42. struct ocfs2_mem_dqinfo {
  43. unsigned int dqi_type; /* Quota type this structure describes */
  44. unsigned int dqi_flags; /* Flags OLQF_* */
  45. unsigned int dqi_chunks; /* Number of chunks in local quota file */
  46. unsigned int dqi_blocks; /* Number of blocks allocated for local quota file */
  47. unsigned int dqi_syncms; /* How often should we sync with other nodes */
  48. struct list_head dqi_chunk; /* List of chunks */
  49. struct inode *dqi_gqinode; /* Global quota file inode */
  50. struct ocfs2_lock_res dqi_gqlock; /* Lock protecting quota information structure */
  51. struct buffer_head *dqi_gqi_bh; /* Buffer head with global quota file inode - set only if inode lock is obtained */
  52. int dqi_gqi_count; /* Number of holders of dqi_gqi_bh */
  53. u64 dqi_giblk; /* Number of block with global information header */
  54. struct buffer_head *dqi_lqi_bh; /* Buffer head with local quota file inode */
  55. struct buffer_head *dqi_libh; /* Buffer with local information header */
  56. struct qtree_mem_dqinfo dqi_gi; /* Info about global file */
  57. struct delayed_work dqi_sync_work; /* Work for syncing dquots */
  58. struct ocfs2_quota_recovery *dqi_rec; /* Pointer to recovery
  59. * information, in case we
  60. * enable quotas on file
  61. * needing it */
  62. };
  63. static inline struct ocfs2_dquot *OCFS2_DQUOT(struct dquot *dquot)
  64. {
  65. return container_of(dquot, struct ocfs2_dquot, dq_dquot);
  66. }
  67. struct ocfs2_quota_chunk {
  68. struct list_head qc_chunk; /* List of quotafile chunks */
  69. int qc_num; /* Number of quota chunk */
  70. struct buffer_head *qc_headerbh; /* Buffer head with chunk header */
  71. };
  72. extern struct kmem_cache *ocfs2_dquot_cachep;
  73. extern struct kmem_cache *ocfs2_qf_chunk_cachep;
  74. extern const struct qtree_fmt_operations ocfs2_global_ops;
  75. struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
  76. struct ocfs2_super *osb, int slot_num);
  77. int ocfs2_finish_quota_recovery(struct ocfs2_super *osb,
  78. struct ocfs2_quota_recovery *rec,
  79. int slot_num);
  80. void ocfs2_free_quota_recovery(struct ocfs2_quota_recovery *rec);
  81. ssize_t ocfs2_quota_read(struct super_block *sb, int type, char *data,
  82. size_t len, loff_t off);
  83. ssize_t ocfs2_quota_write(struct super_block *sb, int type,
  84. const char *data, size_t len, loff_t off);
  85. int ocfs2_global_read_info(struct super_block *sb, int type);
  86. int ocfs2_global_write_info(struct super_block *sb, int type);
  87. int ocfs2_global_read_dquot(struct dquot *dquot);
  88. int __ocfs2_sync_dquot(struct dquot *dquot, int freeing);
  89. static inline int ocfs2_sync_dquot(struct dquot *dquot)
  90. {
  91. return __ocfs2_sync_dquot(dquot, 0);
  92. }
  93. static inline int ocfs2_global_release_dquot(struct dquot *dquot)
  94. {
  95. return __ocfs2_sync_dquot(dquot, 1);
  96. }
  97. int ocfs2_lock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
  98. void ocfs2_unlock_global_qf(struct ocfs2_mem_dqinfo *oinfo, int ex);
  99. int ocfs2_validate_quota_block(struct super_block *sb, struct buffer_head *bh);
  100. int ocfs2_read_quota_phys_block(struct inode *inode, u64 p_block,
  101. struct buffer_head **bh);
  102. int ocfs2_create_local_dquot(struct dquot *dquot);
  103. int ocfs2_local_release_dquot(handle_t *handle, struct dquot *dquot);
  104. int ocfs2_local_write_dquot(struct dquot *dquot);
  105. void ocfs2_drop_dquot_refs(struct work_struct *work);
  106. extern const struct dquot_operations ocfs2_quota_operations;
  107. extern struct quota_format_type ocfs2_quota_format;
  108. #endif /* _OCFS2_QUOTA_H */