fs/hpfs/hpfs_fn.h

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