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 9 //#define DBG 10 //#define DEBUG_LOCKS 11 #ifdef pr_fmt 12 #undef pr_fmt 13 #endif 14 15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17 #include <linux/mutex.h> 18 #include <linux/pagemap.h> 19 #include <linux/buffer_head.h> 20 #include <linux/slab.h> 21 #include <linux/sched.h> 22 #include <linux/blkdev.h> 23 #include <asm/unaligned.h> 24 25 #include "hpfs.h" 26 27 #define EIOERROR EIO 28 #define EFSERROR EPERM 29 #define EMEMERROR ENOMEM 30 31 #define ANODE_ALLOC_FWD 512 32 #define FNODE_ALLOC_FWD 0 33 #define ALLOC_FWD_MIN 16 34 #define ALLOC_FWD_MAX 128 35 #define ALLOC_M 1 36 #define FNODE_RD_AHEAD 16 37 #define ANODE_RD_AHEAD 0 38 #define DNODE_RD_AHEAD 72 39 #define COUNT_RD_AHEAD 62 40 41 #define FREE_DNODES_ADD 58 42 #define FREE_DNODES_DEL 29 43 44 #define CHKCOND(x,y) if (!(x)) printk y 45 46 struct hpfs_inode_info { 47 loff_t mmu_private; 48 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */ 49 unsigned i_dno; /* (directories) root dnode */ 50 unsigned i_dpos; /* (directories) temp for readdir */ 51 unsigned i_dsubdno; /* (directories) temp for readdir */ 52 unsigned i_file_sec; /* (files) minimalist cache of alloc info */ 53 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */ 54 unsigned i_n_secs; /* (files) minimalist cache of alloc info */ 55 unsigned i_ea_size; /* size of extended attributes */ 56 unsigned i_ea_mode : 1; /* file's permission is stored in ea */ 57 unsigned i_ea_uid : 1; /* file's uid is stored in ea */ 58 unsigned i_ea_gid : 1; /* file's gid is stored in ea */ 59 unsigned i_dirty : 1; 60 loff_t **i_rddir_off; 61 struct inode vfs_inode; 62 }; 63 64 struct hpfs_sb_info { 65 struct mutex hpfs_mutex; /* global hpfs lock */ 66 ino_t sb_root; /* inode number of root dir */ 67 unsigned sb_fs_size; /* file system size, sectors */ 68 unsigned sb_bitmaps; /* sector number of bitmap list */ 69 unsigned sb_dirband_start; /* directory band start sector */ 70 unsigned sb_dirband_size; /* directory band size, dnodes */ 71 unsigned sb_dmap; /* sector number of dnode bit map */ 72 unsigned sb_n_free; /* free blocks for statfs, or -1 */ 73 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ 74 kuid_t sb_uid; /* uid from mount options */ 75 kgid_t sb_gid; /* gid from mount options */ 76 umode_t sb_mode; /* mode from mount options */ 77 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ 78 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ 79 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ 80 unsigned sb_lowercase : 1; /* downcase filenames hackery */ 81 unsigned sb_was_error : 1; /* there was an error, set dirty flag */ 82 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ 83 unsigned char *sb_cp_table; /* code page tables: */ 84 /* 128 bytes uppercasing table & */ 85 /* 128 bytes lowercasing table */ 86 __le32 *sb_bmp_dir; /* main bitmap directory */ 87 unsigned sb_c_bitmap; /* current bitmap */ 88 unsigned sb_max_fwd_alloc; /* max forwad allocation */ 89 int sb_timeshift; 90 struct rcu_head rcu; 91 }; 92 93 /* Four 512-byte buffers and the 2k block obtained by concatenating them */ 94 95 struct quad_buffer_head { 96 struct buffer_head *bh[4]; 97 void *data; 98 }; 99 100 /* The b-tree down pointer from a dir entry */ 101 102 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 103 { 104 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 105 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4)); 106 } 107 108 /* The first dir entry in a dnode */ 109 110 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) 111 { 112 return (void *) dnode->dirent; 113 } 114 115 /* The end+1 of the dir entries */ 116 117 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 118 { 119 CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free))); 120 return (void *) dnode + le32_to_cpu(dnode->first_free); 121 } 122 123 /* The dir entry after dir entry de */ 124 125 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 126 { 127 CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length))); 128 return (void *) de + le16_to_cpu(de->length); 129 } 130 131 static inline struct extended_attribute *fnode_ea(struct fnode *fnode) 132 { 133 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); 134 } 135 136 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 137 { 138 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); 139 } 140 141 static unsigned ea_valuelen(struct extended_attribute *ea) 142 { 143 return ea->valuelen_lo + 256 * ea->valuelen_hi; 144 } 145 146 static inline struct extended_attribute *next_ea(struct extended_attribute *ea) 147 { 148 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); 149 } 150 151 static inline secno ea_sec(struct extended_attribute *ea) 152 { 153 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen))); 154 } 155 156 static inline secno ea_len(struct extended_attribute *ea) 157 { 158 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen))); 159 } 160 161 static inline char *ea_data(struct extended_attribute *ea) 162 { 163 return (char *)((char *)ea + 5 + ea->namelen); 164 } 165 166 static inline unsigned de_size(int namelen, secno down_ptr) 167 { 168 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 169 } 170 171 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 172 { 173 int a; 174 int n; 175 if (!dst || !src) return; 176 a = dst->down; 177 n = dst->not_8x3; 178 memcpy((char *)dst + 2, (char *)src + 2, 28); 179 dst->down = a; 180 dst->not_8x3 = n; 181 } 182 183 static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n) 184 { 185 int i; 186 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 187 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; 188 for (i = 1; i < n; i++) 189 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1)) 190 return i + 1; 191 return 0; 192 } 193 194 /* alloc.c */ 195 196 int hpfs_chk_sectors(struct super_block *, secno, int, char *); 197 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int); 198 int hpfs_alloc_if_possible(struct super_block *, secno); 199 void hpfs_free_sectors(struct super_block *, secno, unsigned); 200 int hpfs_check_free_dnodes(struct super_block *, int); 201 void hpfs_free_dnode(struct super_block *, secno); 202 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *); 203 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 204 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 205 int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *); 206 207 /* anode.c */ 208 209 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 210 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 211 void hpfs_remove_btree(struct super_block *, struct bplus_header *); 212 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 213 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); 214 void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 215 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 216 void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 217 218 /* buffer.c */ 219 220 void hpfs_prefetch_sectors(struct super_block *, unsigned, int); 221 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); 222 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); 223 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); 224 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); 225 void hpfs_brelse4(struct quad_buffer_head *); 226 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); 227 228 /* dentry.c */ 229 230 extern const struct dentry_operations hpfs_dentry_operations; 231 232 /* dir.c */ 233 234 struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int); 235 extern const struct file_operations hpfs_dir_ops; 236 237 /* dnode.c */ 238 239 void hpfs_add_pos(struct inode *, loff_t *); 240 void hpfs_del_pos(struct inode *, loff_t *); 241 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, 242 const unsigned char *, unsigned, secno); 243 int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, 244 struct hpfs_dirent *); 245 int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); 246 void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); 247 dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); 248 struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); 249 struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, 250 const unsigned char *, unsigned, dnode_secno *, 251 struct quad_buffer_head *); 252 void hpfs_remove_dtree(struct super_block *, dnode_secno); 253 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 254 255 /* ea.c */ 256 257 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 258 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 259 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 260 void hpfs_set_ea(struct inode *, struct fnode *, const char *, 261 const char *, int); 262 263 /* file.c */ 264 265 int hpfs_file_fsync(struct file *, loff_t, loff_t, int); 266 void hpfs_truncate(struct inode *); 267 extern const struct file_operations hpfs_file_ops; 268 extern const struct inode_operations hpfs_file_iops; 269 extern const struct address_space_operations hpfs_aops; 270 271 /* inode.c */ 272 273 void hpfs_init_inode(struct inode *); 274 void hpfs_read_inode(struct inode *); 275 void hpfs_write_inode(struct inode *); 276 void hpfs_write_inode_nolock(struct inode *); 277 int hpfs_setattr(struct dentry *, struct iattr *); 278 void hpfs_write_if_changed(struct inode *); 279 void hpfs_evict_inode(struct inode *); 280 281 /* map.c */ 282 283 __le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 284 __le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 285 void hpfs_prefetch_bitmap(struct super_block *, unsigned); 286 unsigned char *hpfs_load_code_page(struct super_block *, secno); 287 __le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 288 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 289 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 290 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 291 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 292 293 /* name.c */ 294 295 unsigned char hpfs_upcase(unsigned char *, unsigned char); 296 int hpfs_chk_name(const unsigned char *, unsigned *); 297 unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 298 int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, 299 const unsigned char *, unsigned, int); 300 int hpfs_is_name_long(const unsigned char *, unsigned); 301 void hpfs_adjust_length(const unsigned char *, unsigned *); 302 303 /* namei.c */ 304 305 extern const struct inode_operations hpfs_dir_iops; 306 extern const struct address_space_operations hpfs_symlink_aops; 307 308 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 309 { 310 return container_of(inode, struct hpfs_inode_info, vfs_inode); 311 } 312 313 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 314 { 315 return sb->s_fs_info; 316 } 317 318 /* super.c */ 319 320 __printf(2, 3) 321 void hpfs_error(struct super_block *, const char *, ...); 322 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 323 unsigned hpfs_get_free_dnodes(struct super_block *); 324 long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg); 325 326 /* 327 * local time (HPFS) to GMT (Unix) 328 */ 329 330 static inline time_t local_to_gmt(struct super_block *s, time32_t t) 331 { 332 extern struct timezone sys_tz; 333 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; 334 } 335 336 static inline time32_t gmt_to_local(struct super_block *s, time_t t) 337 { 338 extern struct timezone sys_tz; 339 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; 340 } 341 342 /* 343 * Locking: 344 * 345 * hpfs_lock() locks the whole filesystem. It must be taken 346 * on any method called by the VFS. 347 * 348 * We don't do any per-file locking anymore, it is hard to 349 * review and HPFS is not performance-sensitive anyway. 350 */ 351 static inline void hpfs_lock(struct super_block *s) 352 { 353 struct hpfs_sb_info *sbi = hpfs_sb(s); 354 mutex_lock(&sbi->hpfs_mutex); 355 } 356 357 static inline void hpfs_unlock(struct super_block *s) 358 { 359 struct hpfs_sb_info *sbi = hpfs_sb(s); 360 mutex_unlock(&sbi->hpfs_mutex); 361 } 362 363 static inline void hpfs_lock_assert(struct super_block *s) 364 { 365 struct hpfs_sb_info *sbi = hpfs_sb(s); 366 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); 367 } 368