quotaops.h 9.8 KB

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381
  1. /*
  2. * Definitions for diskquota-operations. When diskquota is configured these
  3. * macros expand to the right source-code.
  4. *
  5. * Author: Marco van Wieringen <mvw@planets.elm.net>
  6. */
  7. #ifndef _LINUX_QUOTAOPS_
  8. #define _LINUX_QUOTAOPS_
  9. #include <linux/fs.h>
  10. #define DQUOT_SPACE_WARN 0x1
  11. #define DQUOT_SPACE_RESERVE 0x2
  12. #define DQUOT_SPACE_NOFAIL 0x4
  13. static inline struct quota_info *sb_dqopt(struct super_block *sb)
  14. {
  15. return &sb->s_dquot;
  16. }
  17. /* i_mutex must being held */
  18. static inline bool is_quota_modification(struct inode *inode, struct iattr *ia)
  19. {
  20. return (ia->ia_valid & ATTR_SIZE && ia->ia_size != inode->i_size) ||
  21. (ia->ia_valid & ATTR_UID && !uid_eq(ia->ia_uid, inode->i_uid)) ||
  22. (ia->ia_valid & ATTR_GID && !gid_eq(ia->ia_gid, inode->i_gid));
  23. }
  24. #if defined(CONFIG_QUOTA)
  25. #define quota_error(sb, fmt, args...) \
  26. __quota_error((sb), __func__, fmt , ## args)
  27. extern __printf(3, 4)
  28. void __quota_error(struct super_block *sb, const char *func,
  29. const char *fmt, ...);
  30. /*
  31. * declaration of quota_function calls in kernel.
  32. */
  33. void inode_add_rsv_space(struct inode *inode, qsize_t number);
  34. void inode_claim_rsv_space(struct inode *inode, qsize_t number);
  35. void inode_sub_rsv_space(struct inode *inode, qsize_t number);
  36. void inode_reclaim_rsv_space(struct inode *inode, qsize_t number);
  37. void dquot_initialize(struct inode *inode);
  38. void dquot_drop(struct inode *inode);
  39. struct dquot *dqget(struct super_block *sb, struct kqid qid);
  40. void dqput(struct dquot *dquot);
  41. int dquot_scan_active(struct super_block *sb,
  42. int (*fn)(struct dquot *dquot, unsigned long priv),
  43. unsigned long priv);
  44. struct dquot *dquot_alloc(struct super_block *sb, int type);
  45. void dquot_destroy(struct dquot *dquot);
  46. int __dquot_alloc_space(struct inode *inode, qsize_t number, int flags);
  47. void __dquot_free_space(struct inode *inode, qsize_t number, int flags);
  48. int dquot_alloc_inode(const struct inode *inode);
  49. int dquot_claim_space_nodirty(struct inode *inode, qsize_t number);
  50. void dquot_free_inode(const struct inode *inode);
  51. void dquot_reclaim_space_nodirty(struct inode *inode, qsize_t number);
  52. int dquot_disable(struct super_block *sb, int type, unsigned int flags);
  53. /* Suspend quotas on remount RO */
  54. static inline int dquot_suspend(struct super_block *sb, int type)
  55. {
  56. return dquot_disable(sb, type, DQUOT_SUSPENDED);
  57. }
  58. int dquot_resume(struct super_block *sb, int type);
  59. int dquot_commit(struct dquot *dquot);
  60. int dquot_acquire(struct dquot *dquot);
  61. int dquot_release(struct dquot *dquot);
  62. int dquot_commit_info(struct super_block *sb, int type);
  63. int dquot_mark_dquot_dirty(struct dquot *dquot);
  64. int dquot_file_open(struct inode *inode, struct file *file);
  65. int dquot_enable(struct inode *inode, int type, int format_id,
  66. unsigned int flags);
  67. int dquot_quota_on(struct super_block *sb, int type, int format_id,
  68. struct path *path);
  69. int dquot_quota_on_mount(struct super_block *sb, char *qf_name,
  70. int format_id, int type);
  71. int dquot_quota_off(struct super_block *sb, int type);
  72. int dquot_writeback_dquots(struct super_block *sb, int type);
  73. int dquot_quota_sync(struct super_block *sb, int type);
  74. int dquot_get_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  75. int dquot_set_dqinfo(struct super_block *sb, int type, struct if_dqinfo *ii);
  76. int dquot_get_dqblk(struct super_block *sb, struct kqid id,
  77. struct fs_disk_quota *di);
  78. int dquot_set_dqblk(struct super_block *sb, struct kqid id,
  79. struct fs_disk_quota *di);
  80. int __dquot_transfer(struct inode *inode, struct dquot **transfer_to);
  81. int dquot_transfer(struct inode *inode, struct iattr *iattr);
  82. static inline struct mem_dqinfo *sb_dqinfo(struct super_block *sb, int type)
  83. {
  84. return sb_dqopt(sb)->info + type;
  85. }
  86. /*
  87. * Functions for checking status of quota
  88. */
  89. static inline bool sb_has_quota_usage_enabled(struct super_block *sb, int type)
  90. {
  91. return sb_dqopt(sb)->flags &
  92. dquot_state_flag(DQUOT_USAGE_ENABLED, type);
  93. }
  94. static inline bool sb_has_quota_limits_enabled(struct super_block *sb, int type)
  95. {
  96. return sb_dqopt(sb)->flags &
  97. dquot_state_flag(DQUOT_LIMITS_ENABLED, type);
  98. }
  99. static inline bool sb_has_quota_suspended(struct super_block *sb, int type)
  100. {
  101. return sb_dqopt(sb)->flags &
  102. dquot_state_flag(DQUOT_SUSPENDED, type);
  103. }
  104. static inline unsigned sb_any_quota_suspended(struct super_block *sb)
  105. {
  106. unsigned type, tmsk = 0;
  107. for (type = 0; type < MAXQUOTAS; type++)
  108. tmsk |= sb_has_quota_suspended(sb, type) << type;
  109. return tmsk;
  110. }
  111. /* Does kernel know about any quota information for given sb + type? */
  112. static inline bool sb_has_quota_loaded(struct super_block *sb, int type)
  113. {
  114. /* Currently if anything is on, then quota usage is on as well */
  115. return sb_has_quota_usage_enabled(sb, type);
  116. }
  117. static inline unsigned sb_any_quota_loaded(struct super_block *sb)
  118. {
  119. unsigned type, tmsk = 0;
  120. for (type = 0; type < MAXQUOTAS; type++)
  121. tmsk |= sb_has_quota_loaded(sb, type) << type;
  122. return tmsk;
  123. }
  124. static inline bool sb_has_quota_active(struct super_block *sb, int type)
  125. {
  126. return sb_has_quota_loaded(sb, type) &&
  127. !sb_has_quota_suspended(sb, type);
  128. }
  129. /*
  130. * Operations supported for diskquotas.
  131. */
  132. extern const struct dquot_operations dquot_operations;
  133. extern const struct quotactl_ops dquot_quotactl_ops;
  134. #else
  135. static inline int sb_has_quota_usage_enabled(struct super_block *sb, int type)
  136. {
  137. return 0;
  138. }
  139. static inline int sb_has_quota_limits_enabled(struct super_block *sb, int type)
  140. {
  141. return 0;
  142. }
  143. static inline int sb_has_quota_suspended(struct super_block *sb, int type)
  144. {
  145. return 0;
  146. }
  147. static inline int sb_any_quota_suspended(struct super_block *sb)
  148. {
  149. return 0;
  150. }
  151. /* Does kernel know about any quota information for given sb + type? */
  152. static inline int sb_has_quota_loaded(struct super_block *sb, int type)
  153. {
  154. return 0;
  155. }
  156. static inline int sb_any_quota_loaded(struct super_block *sb)
  157. {
  158. return 0;
  159. }
  160. static inline int sb_has_quota_active(struct super_block *sb, int type)
  161. {
  162. return 0;
  163. }
  164. static inline void dquot_initialize(struct inode *inode)
  165. {
  166. }
  167. static inline void dquot_drop(struct inode *inode)
  168. {
  169. }
  170. static inline int dquot_alloc_inode(const struct inode *inode)
  171. {
  172. return 0;
  173. }
  174. static inline void dquot_free_inode(const struct inode *inode)
  175. {
  176. }
  177. static inline int dquot_transfer(struct inode *inode, struct iattr *iattr)
  178. {
  179. return 0;
  180. }
  181. static inline int __dquot_alloc_space(struct inode *inode, qsize_t number,
  182. int flags)
  183. {
  184. if (!(flags & DQUOT_SPACE_RESERVE))
  185. inode_add_bytes(inode, number);
  186. return 0;
  187. }
  188. static inline void __dquot_free_space(struct inode *inode, qsize_t number,
  189. int flags)
  190. {
  191. if (!(flags & DQUOT_SPACE_RESERVE))
  192. inode_sub_bytes(inode, number);
  193. }
  194. static inline int dquot_claim_space_nodirty(struct inode *inode, qsize_t number)
  195. {
  196. inode_add_bytes(inode, number);
  197. return 0;
  198. }
  199. static inline int dquot_reclaim_space_nodirty(struct inode *inode,
  200. qsize_t number)
  201. {
  202. inode_sub_bytes(inode, number);
  203. return 0;
  204. }
  205. static inline int dquot_disable(struct super_block *sb, int type,
  206. unsigned int flags)
  207. {
  208. return 0;
  209. }
  210. static inline int dquot_suspend(struct super_block *sb, int type)
  211. {
  212. return 0;
  213. }
  214. static inline int dquot_resume(struct super_block *sb, int type)
  215. {
  216. return 0;
  217. }
  218. #define dquot_file_open generic_file_open
  219. static inline int dquot_writeback_dquots(struct super_block *sb, int type)
  220. {
  221. return 0;
  222. }
  223. #endif /* CONFIG_QUOTA */
  224. static inline int dquot_alloc_space_nodirty(struct inode *inode, qsize_t nr)
  225. {
  226. return __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN);
  227. }
  228. static inline void dquot_alloc_space_nofail(struct inode *inode, qsize_t nr)
  229. {
  230. __dquot_alloc_space(inode, nr, DQUOT_SPACE_WARN|DQUOT_SPACE_NOFAIL);
  231. mark_inode_dirty_sync(inode);
  232. }
  233. static inline int dquot_alloc_space(struct inode *inode, qsize_t nr)
  234. {
  235. int ret;
  236. ret = dquot_alloc_space_nodirty(inode, nr);
  237. if (!ret) {
  238. /*
  239. * Mark inode fully dirty. Since we are allocating blocks, inode
  240. * would become fully dirty soon anyway and it reportedly
  241. * reduces lock contention.
  242. */
  243. mark_inode_dirty(inode);
  244. }
  245. return ret;
  246. }
  247. static inline int dquot_alloc_block_nodirty(struct inode *inode, qsize_t nr)
  248. {
  249. return dquot_alloc_space_nodirty(inode, nr << inode->i_blkbits);
  250. }
  251. static inline void dquot_alloc_block_nofail(struct inode *inode, qsize_t nr)
  252. {
  253. dquot_alloc_space_nofail(inode, nr << inode->i_blkbits);
  254. }
  255. static inline int dquot_alloc_block(struct inode *inode, qsize_t nr)
  256. {
  257. return dquot_alloc_space(inode, nr << inode->i_blkbits);
  258. }
  259. static inline int dquot_prealloc_block_nodirty(struct inode *inode, qsize_t nr)
  260. {
  261. return __dquot_alloc_space(inode, nr << inode->i_blkbits, 0);
  262. }
  263. static inline int dquot_prealloc_block(struct inode *inode, qsize_t nr)
  264. {
  265. int ret;
  266. ret = dquot_prealloc_block_nodirty(inode, nr);
  267. if (!ret)
  268. mark_inode_dirty_sync(inode);
  269. return ret;
  270. }
  271. static inline int dquot_reserve_block(struct inode *inode, qsize_t nr)
  272. {
  273. return __dquot_alloc_space(inode, nr << inode->i_blkbits,
  274. DQUOT_SPACE_WARN|DQUOT_SPACE_RESERVE);
  275. }
  276. static inline int dquot_claim_block(struct inode *inode, qsize_t nr)
  277. {
  278. int ret;
  279. ret = dquot_claim_space_nodirty(inode, nr << inode->i_blkbits);
  280. if (!ret)
  281. mark_inode_dirty_sync(inode);
  282. return ret;
  283. }
  284. static inline void dquot_reclaim_block(struct inode *inode, qsize_t nr)
  285. {
  286. dquot_reclaim_space_nodirty(inode, nr << inode->i_blkbits);
  287. mark_inode_dirty_sync(inode);
  288. }
  289. static inline void dquot_free_space_nodirty(struct inode *inode, qsize_t nr)
  290. {
  291. __dquot_free_space(inode, nr, 0);
  292. }
  293. static inline void dquot_free_space(struct inode *inode, qsize_t nr)
  294. {
  295. dquot_free_space_nodirty(inode, nr);
  296. mark_inode_dirty_sync(inode);
  297. }
  298. static inline void dquot_free_block_nodirty(struct inode *inode, qsize_t nr)
  299. {
  300. dquot_free_space_nodirty(inode, nr << inode->i_blkbits);
  301. }
  302. static inline void dquot_free_block(struct inode *inode, qsize_t nr)
  303. {
  304. dquot_free_space(inode, nr << inode->i_blkbits);
  305. }
  306. static inline void dquot_release_reservation_block(struct inode *inode,
  307. qsize_t nr)
  308. {
  309. __dquot_free_space(inode, nr << inode->i_blkbits, DQUOT_SPACE_RESERVE);
  310. }
  311. #endif /* _LINUX_QUOTAOPS_ */