affs.h 11 KB

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  1. /* SPDX-License-Identifier: GPL-2.0 */
  2. #ifdef pr_fmt
  3. #undef pr_fmt
  4. #endif
  5. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  6. #include <linux/types.h>
  7. #include <linux/fs.h>
  8. #include <linux/buffer_head.h>
  9. #include "amigaffs.h"
  10. #include <linux/mutex.h>
  11. #include <linux/workqueue.h>
  12. /* Ugly macros make the code more pretty. */
  13. #define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st))))
  14. #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  15. #define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  16. #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data)
  17. #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
  18. #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data)
  19. #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
  20. #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data)
  21. #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data)
  22. #define AFFS_CACHE_SIZE PAGE_SIZE
  23. #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2)
  24. #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  25. #define AFFS_AC_MASK (AFFS_AC_SIZE-1)
  26. #define AFFSNAMEMAX 30U
  27. struct affs_ext_key {
  28. u32 ext; /* idx of the extended block */
  29. u32 key; /* block number */
  30. };
  31. /*
  32. * affs fs inode data in memory
  33. */
  34. struct affs_inode_info {
  35. atomic_t i_opencnt;
  36. struct mutex i_link_lock; /* Protects internal inode access. */
  37. struct mutex i_ext_lock; /* Protects internal inode access. */
  38. #define i_hash_lock i_ext_lock
  39. u32 i_blkcnt; /* block count */
  40. u32 i_extcnt; /* extended block count */
  41. u32 *i_lc; /* linear cache of extended blocks */
  42. u32 i_lc_size;
  43. u32 i_lc_shift;
  44. u32 i_lc_mask;
  45. struct affs_ext_key *i_ac; /* associative cache of extended blocks */
  46. u32 i_ext_last; /* last accessed extended block */
  47. struct buffer_head *i_ext_bh; /* bh of last extended block */
  48. loff_t mmu_private;
  49. u32 i_protect; /* unused attribute bits */
  50. u32 i_lastalloc; /* last allocated block */
  51. int i_pa_cnt; /* number of preallocated blocks */
  52. struct inode vfs_inode;
  53. };
  54. /* short cut to get to the affs specific inode data */
  55. static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  56. {
  57. return container_of(inode, struct affs_inode_info, vfs_inode);
  58. }
  59. /*
  60. * super-block data in memory
  61. *
  62. * Block numbers are adjusted for their actual size
  63. *
  64. */
  65. struct affs_bm_info {
  66. u32 bm_key; /* Disk block number */
  67. u32 bm_free; /* Free blocks in here */
  68. };
  69. struct affs_sb_info {
  70. int s_partition_size; /* Partition size in blocks. */
  71. int s_reserved; /* Number of reserved blocks. */
  72. //u32 s_blksize; /* Initial device blksize */
  73. u32 s_data_blksize; /* size of the data block w/o header */
  74. u32 s_root_block; /* FFS root block number. */
  75. int s_hashsize; /* Size of hash table. */
  76. unsigned long s_flags; /* See below. */
  77. kuid_t s_uid; /* uid to override */
  78. kgid_t s_gid; /* gid to override */
  79. umode_t s_mode; /* mode to override */
  80. struct buffer_head *s_root_bh; /* Cached root block. */
  81. struct mutex s_bmlock; /* Protects bitmap access. */
  82. struct affs_bm_info *s_bitmap; /* Bitmap infos. */
  83. u32 s_bmap_count; /* # of bitmap blocks. */
  84. u32 s_bmap_bits; /* # of bits in one bitmap blocks */
  85. u32 s_last_bmap;
  86. struct buffer_head *s_bmap_bh;
  87. char *s_prefix; /* Prefix for volumes and assigns. */
  88. char s_volume[32]; /* Volume prefix for absolute symlinks. */
  89. spinlock_t symlink_lock; /* protects the previous two */
  90. struct super_block *sb; /* the VFS superblock object */
  91. int work_queued; /* non-zero delayed work is queued */
  92. struct delayed_work sb_work; /* superblock flush delayed work */
  93. spinlock_t work_lock; /* protects sb_work and work_queued */
  94. };
  95. #define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */
  96. #define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */
  97. #define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */
  98. #define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */
  99. #define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */
  100. #define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */
  101. #define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */
  102. #define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */
  103. #define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */
  104. #define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */
  105. #define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */
  106. #define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */
  107. #define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt)
  108. #define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt)
  109. #define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt)
  110. /* short cut to get to the affs specific sb data */
  111. static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
  112. {
  113. return sb->s_fs_info;
  114. }
  115. void affs_mark_sb_dirty(struct super_block *sb);
  116. /* amigaffs.c */
  117. extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh);
  118. extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
  119. extern int affs_remove_header(struct dentry *dentry);
  120. extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
  121. extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
  122. extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
  123. extern umode_t affs_prot_to_mode(u32 prot);
  124. extern void affs_mode_to_prot(struct inode *inode);
  125. __printf(3, 4)
  126. extern void affs_error(struct super_block *sb, const char *function,
  127. const char *fmt, ...);
  128. __printf(3, 4)
  129. extern void affs_warning(struct super_block *sb, const char *function,
  130. const char *fmt, ...);
  131. extern bool affs_nofilenametruncate(const struct dentry *dentry);
  132. extern int affs_check_name(const unsigned char *name, int len,
  133. bool notruncate);
  134. extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry);
  135. /* bitmap. c */
  136. extern u32 affs_count_free_blocks(struct super_block *s);
  137. extern void affs_free_block(struct super_block *sb, u32 block);
  138. extern u32 affs_alloc_block(struct inode *inode, u32 goal);
  139. extern int affs_init_bitmap(struct super_block *sb, int *flags);
  140. extern void affs_free_bitmap(struct super_block *sb);
  141. /* namei.c */
  142. extern const struct export_operations affs_export_ops;
  143. extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
  144. extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
  145. extern int affs_unlink(struct inode *dir, struct dentry *dentry);
  146. extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool);
  147. extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
  148. extern int affs_rmdir(struct inode *dir, struct dentry *dentry);
  149. extern int affs_link(struct dentry *olddentry, struct inode *dir,
  150. struct dentry *dentry);
  151. extern int affs_symlink(struct inode *dir, struct dentry *dentry,
  152. const char *symname);
  153. extern int affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
  154. struct inode *new_dir, struct dentry *new_dentry,
  155. unsigned int flags);
  156. /* inode.c */
  157. extern struct inode *affs_new_inode(struct inode *dir);
  158. extern int affs_notify_change(struct dentry *dentry, struct iattr *attr);
  159. extern void affs_evict_inode(struct inode *inode);
  160. extern struct inode *affs_iget(struct super_block *sb,
  161. unsigned long ino);
  162. extern int affs_write_inode(struct inode *inode,
  163. struct writeback_control *wbc);
  164. extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
  165. /* file.c */
  166. void affs_free_prealloc(struct inode *inode);
  167. extern void affs_truncate(struct inode *);
  168. int affs_file_fsync(struct file *, loff_t, loff_t, int);
  169. /* dir.c */
  170. extern void affs_dir_truncate(struct inode *);
  171. /* jump tables */
  172. extern const struct inode_operations affs_file_inode_operations;
  173. extern const struct inode_operations affs_dir_inode_operations;
  174. extern const struct inode_operations affs_symlink_inode_operations;
  175. extern const struct file_operations affs_file_operations;
  176. extern const struct file_operations affs_file_operations_ofs;
  177. extern const struct file_operations affs_dir_operations;
  178. extern const struct address_space_operations affs_symlink_aops;
  179. extern const struct address_space_operations affs_aops;
  180. extern const struct address_space_operations affs_aops_ofs;
  181. extern const struct dentry_operations affs_dentry_operations;
  182. extern const struct dentry_operations affs_intl_dentry_operations;
  183. static inline bool affs_validblock(struct super_block *sb, int block)
  184. {
  185. return(block >= AFFS_SB(sb)->s_reserved &&
  186. block < AFFS_SB(sb)->s_partition_size);
  187. }
  188. static inline void
  189. affs_set_blocksize(struct super_block *sb, int size)
  190. {
  191. sb_set_blocksize(sb, size);
  192. }
  193. static inline struct buffer_head *
  194. affs_bread(struct super_block *sb, int block)
  195. {
  196. pr_debug("%s: %d\n", __func__, block);
  197. if (affs_validblock(sb, block))
  198. return sb_bread(sb, block);
  199. return NULL;
  200. }
  201. static inline struct buffer_head *
  202. affs_getblk(struct super_block *sb, int block)
  203. {
  204. pr_debug("%s: %d\n", __func__, block);
  205. if (affs_validblock(sb, block))
  206. return sb_getblk(sb, block);
  207. return NULL;
  208. }
  209. static inline struct buffer_head *
  210. affs_getzeroblk(struct super_block *sb, int block)
  211. {
  212. struct buffer_head *bh;
  213. pr_debug("%s: %d\n", __func__, block);
  214. if (affs_validblock(sb, block)) {
  215. bh = sb_getblk(sb, block);
  216. lock_buffer(bh);
  217. memset(bh->b_data, 0 , sb->s_blocksize);
  218. set_buffer_uptodate(bh);
  219. unlock_buffer(bh);
  220. return bh;
  221. }
  222. return NULL;
  223. }
  224. static inline struct buffer_head *
  225. affs_getemptyblk(struct super_block *sb, int block)
  226. {
  227. struct buffer_head *bh;
  228. pr_debug("%s: %d\n", __func__, block);
  229. if (affs_validblock(sb, block)) {
  230. bh = sb_getblk(sb, block);
  231. wait_on_buffer(bh);
  232. set_buffer_uptodate(bh);
  233. return bh;
  234. }
  235. return NULL;
  236. }
  237. static inline void
  238. affs_brelse(struct buffer_head *bh)
  239. {
  240. if (bh)
  241. pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
  242. brelse(bh);
  243. }
  244. static inline void
  245. affs_adjust_checksum(struct buffer_head *bh, u32 val)
  246. {
  247. u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
  248. ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
  249. }
  250. static inline void
  251. affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
  252. {
  253. u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
  254. ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
  255. }
  256. static inline void
  257. affs_lock_link(struct inode *inode)
  258. {
  259. mutex_lock(&AFFS_I(inode)->i_link_lock);
  260. }
  261. static inline void
  262. affs_unlock_link(struct inode *inode)
  263. {
  264. mutex_unlock(&AFFS_I(inode)->i_link_lock);
  265. }
  266. static inline void
  267. affs_lock_dir(struct inode *inode)
  268. {
  269. mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
  270. }
  271. static inline void
  272. affs_unlock_dir(struct inode *inode)
  273. {
  274. mutex_unlock(&AFFS_I(inode)->i_hash_lock);
  275. }
  276. static inline void
  277. affs_lock_ext(struct inode *inode)
  278. {
  279. mutex_lock(&AFFS_I(inode)->i_ext_lock);
  280. }
  281. static inline void
  282. affs_unlock_ext(struct inode *inode)
  283. {
  284. mutex_unlock(&AFFS_I(inode)->i_ext_lock);
  285. }