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