hpfs_fn.h 12 KB

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  1. /*
  2. * linux/fs/hpfs/hpfs_fn.h
  3. *
  4. * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
  5. *
  6. * function headers
  7. */
  8. //#define DBG
  9. //#define DEBUG_LOCKS
  10. #include <linux/mutex.h>
  11. #include <linux/pagemap.h>
  12. #include <linux/buffer_head.h>
  13. #include <linux/slab.h>
  14. #include <linux/smp_lock.h>
  15. #include "hpfs.h"
  16. #define EIOERROR EIO
  17. #define EFSERROR EPERM
  18. #define EMEMERROR ENOMEM
  19. #define ANODE_ALLOC_FWD 512
  20. #define FNODE_ALLOC_FWD 0
  21. #define ALLOC_FWD_MIN 16
  22. #define ALLOC_FWD_MAX 128
  23. #define ALLOC_M 1
  24. #define FNODE_RD_AHEAD 16
  25. #define ANODE_RD_AHEAD 16
  26. #define DNODE_RD_AHEAD 4
  27. #define FREE_DNODES_ADD 58
  28. #define FREE_DNODES_DEL 29
  29. #define CHKCOND(x,y) if (!(x)) printk y
  30. #ifdef DBG
  31. #define PRINTK(x) printk x
  32. #else
  33. #undef PRINTK
  34. #define PRINTK(x)
  35. #endif
  36. struct hpfs_inode_info {
  37. loff_t mmu_private;
  38. ino_t i_parent_dir; /* (directories) gives fnode of parent dir */
  39. unsigned i_dno; /* (directories) root dnode */
  40. unsigned i_dpos; /* (directories) temp for readdir */
  41. unsigned i_dsubdno; /* (directories) temp for readdir */
  42. unsigned i_file_sec; /* (files) minimalist cache of alloc info */
  43. unsigned i_disk_sec; /* (files) minimalist cache of alloc info */
  44. unsigned i_n_secs; /* (files) minimalist cache of alloc info */
  45. unsigned i_ea_size; /* size of extended attributes */
  46. unsigned i_conv : 2; /* (files) crlf->newline hackery */
  47. unsigned i_ea_mode : 1; /* file's permission is stored in ea */
  48. unsigned i_ea_uid : 1; /* file's uid is stored in ea */
  49. unsigned i_ea_gid : 1; /* file's gid is stored in ea */
  50. unsigned i_dirty : 1;
  51. struct mutex i_mutex;
  52. struct mutex i_parent_mutex;
  53. loff_t **i_rddir_off;
  54. struct inode vfs_inode;
  55. };
  56. struct hpfs_sb_info {
  57. ino_t sb_root; /* inode number of root dir */
  58. unsigned sb_fs_size; /* file system size, sectors */
  59. unsigned sb_bitmaps; /* sector number of bitmap list */
  60. unsigned sb_dirband_start; /* directory band start sector */
  61. unsigned sb_dirband_size; /* directory band size, dnodes */
  62. unsigned sb_dmap; /* sector number of dnode bit map */
  63. unsigned sb_n_free; /* free blocks for statfs, or -1 */
  64. unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */
  65. uid_t sb_uid; /* uid from mount options */
  66. gid_t sb_gid; /* gid from mount options */
  67. umode_t sb_mode; /* mode from mount options */
  68. unsigned sb_conv : 2; /* crlf->newline hackery */
  69. unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */
  70. unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */
  71. unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */
  72. unsigned sb_lowercase : 1; /* downcase filenames hackery */
  73. unsigned sb_was_error : 1; /* there was an error, set dirty flag */
  74. unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */
  75. unsigned char *sb_cp_table; /* code page tables: */
  76. /* 128 bytes uppercasing table & */
  77. /* 128 bytes lowercasing table */
  78. unsigned *sb_bmp_dir; /* main bitmap directory */
  79. unsigned sb_c_bitmap; /* current bitmap */
  80. unsigned sb_max_fwd_alloc; /* max forwad allocation */
  81. struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
  82. can alloc blocks */
  83. /*unsigned sb_mounting : 1;*/
  84. int sb_timeshift;
  85. };
  86. /*
  87. * conv= options
  88. */
  89. #define CONV_BINARY 0 /* no conversion */
  90. #define CONV_TEXT 1 /* crlf->newline */
  91. #define CONV_AUTO 2 /* decide based on file contents */
  92. /* Four 512-byte buffers and the 2k block obtained by concatenating them */
  93. struct quad_buffer_head {
  94. struct buffer_head *bh[4];
  95. void *data;
  96. };
  97. /* The b-tree down pointer from a dir entry */
  98. static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
  99. {
  100. CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
  101. return *(dnode_secno *) ((void *) de + de->length - 4);
  102. }
  103. /* The first dir entry in a dnode */
  104. static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
  105. {
  106. return (void *) dnode->dirent;
  107. }
  108. /* The end+1 of the dir entries */
  109. static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
  110. {
  111. CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
  112. return (void *) dnode + dnode->first_free;
  113. }
  114. /* The dir entry after dir entry de */
  115. static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
  116. {
  117. CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
  118. return (void *) de + de->length;
  119. }
  120. static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
  121. {
  122. return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
  123. }
  124. static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
  125. {
  126. return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
  127. }
  128. static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
  129. {
  130. return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
  131. }
  132. static inline secno ea_sec(struct extended_attribute *ea)
  133. {
  134. return *(secno *)((char *)ea + 9 + ea->namelen);
  135. }
  136. static inline secno ea_len(struct extended_attribute *ea)
  137. {
  138. return *(secno *)((char *)ea + 5 + ea->namelen);
  139. }
  140. static inline char *ea_data(struct extended_attribute *ea)
  141. {
  142. return (char *)((char *)ea + 5 + ea->namelen);
  143. }
  144. static inline unsigned de_size(int namelen, secno down_ptr)
  145. {
  146. return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
  147. }
  148. static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
  149. {
  150. int a;
  151. int n;
  152. if (!dst || !src) return;
  153. a = dst->down;
  154. n = dst->not_8x3;
  155. memcpy((char *)dst + 2, (char *)src + 2, 28);
  156. dst->down = a;
  157. dst->not_8x3 = n;
  158. }
  159. static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
  160. {
  161. int i;
  162. if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
  163. if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
  164. for (i = 1; i < n; i++)
  165. if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
  166. return i + 1;
  167. return 0;
  168. }
  169. /* alloc.c */
  170. int hpfs_chk_sectors(struct super_block *, secno, int, char *);
  171. secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
  172. int hpfs_alloc_if_possible(struct super_block *, secno);
  173. void hpfs_free_sectors(struct super_block *, secno, unsigned);
  174. int hpfs_check_free_dnodes(struct super_block *, int);
  175. void hpfs_free_dnode(struct super_block *, secno);
  176. struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
  177. struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
  178. struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
  179. /* anode.c */
  180. secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
  181. secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
  182. void hpfs_remove_btree(struct super_block *, struct bplus_header *);
  183. int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
  184. int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
  185. void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
  186. void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
  187. void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
  188. /* buffer.c */
  189. void hpfs_lock_creation(struct super_block *);
  190. void hpfs_unlock_creation(struct super_block *);
  191. void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
  192. void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
  193. void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
  194. void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
  195. void hpfs_brelse4(struct quad_buffer_head *);
  196. void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
  197. /* dentry.c */
  198. void hpfs_set_dentry_operations(struct dentry *);
  199. /* dir.c */
  200. struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
  201. extern const struct file_operations hpfs_dir_ops;
  202. /* dnode.c */
  203. void hpfs_add_pos(struct inode *, loff_t *);
  204. void hpfs_del_pos(struct inode *, loff_t *);
  205. struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
  206. int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
  207. int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
  208. void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
  209. dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
  210. struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
  211. struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
  212. void hpfs_remove_dtree(struct super_block *, dnode_secno);
  213. struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
  214. /* ea.c */
  215. void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
  216. int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
  217. char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
  218. void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
  219. /* file.c */
  220. int hpfs_file_fsync(struct file *, struct dentry *, int);
  221. extern const struct file_operations hpfs_file_ops;
  222. extern const struct inode_operations hpfs_file_iops;
  223. extern const struct address_space_operations hpfs_aops;
  224. /* inode.c */
  225. void hpfs_init_inode(struct inode *);
  226. void hpfs_read_inode(struct inode *);
  227. void hpfs_write_inode(struct inode *);
  228. void hpfs_write_inode_nolock(struct inode *);
  229. int hpfs_notify_change(struct dentry *, struct iattr *);
  230. void hpfs_write_if_changed(struct inode *);
  231. void hpfs_delete_inode(struct inode *);
  232. /* map.c */
  233. unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
  234. unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
  235. char *hpfs_load_code_page(struct super_block *, secno);
  236. secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
  237. struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
  238. struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
  239. struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
  240. dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
  241. /* name.c */
  242. unsigned char hpfs_upcase(unsigned char *, unsigned char);
  243. int hpfs_chk_name(unsigned char *, unsigned *);
  244. char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
  245. int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
  246. int hpfs_is_name_long(unsigned char *, unsigned);
  247. void hpfs_adjust_length(unsigned char *, unsigned *);
  248. void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
  249. /* namei.c */
  250. extern const struct inode_operations hpfs_dir_iops;
  251. extern const struct address_space_operations hpfs_symlink_aops;
  252. static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
  253. {
  254. return list_entry(inode, struct hpfs_inode_info, vfs_inode);
  255. }
  256. static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
  257. {
  258. return sb->s_fs_info;
  259. }
  260. /* super.c */
  261. void hpfs_error(struct super_block *, const char *, ...)
  262. __attribute__((format (printf, 2, 3)));
  263. int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
  264. unsigned hpfs_count_one_bitmap(struct super_block *, secno);
  265. /*
  266. * local time (HPFS) to GMT (Unix)
  267. */
  268. static inline time_t local_to_gmt(struct super_block *s, time32_t t)
  269. {
  270. extern struct timezone sys_tz;
  271. return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
  272. }
  273. static inline time32_t gmt_to_local(struct super_block *s, time_t t)
  274. {
  275. extern struct timezone sys_tz;
  276. return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
  277. }