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/hpfs_fs.h>
  16 #include <linux/slab.h>
  17 #include <linux/smp_lock.h>
  18
  19 #include "hpfs.h"
  20
  21 #define EIOERROR  EIO
  22 #define EFSERROR  EPERM
  23 #define EMEMERROR ENOMEM
  24
  25 #define ANODE_ALLOC_FWD 512
  26 #define FNODE_ALLOC_FWD 0
  27 #define ALLOC_FWD_MIN   16
  28 #define ALLOC_FWD_MAX   128
  29 #define ALLOC_M         1
  30 #define FNODE_RD_AHEAD  16
  31 #define ANODE_RD_AHEAD  16
  32 #define DNODE_RD_AHEAD  4
  33
  34 #define FREE_DNODES_ADD 58
  35 #define FREE_DNODES_DEL 29
  36
  37 #define CHKCOND(x,y) if (!(x)) printk y
  38
  39 #ifdef DBG
  40 #define PRINTK(x) printk x
  41 #else
  42 #undef PRINTK
  43 #define PRINTK(x)
  44 #endif
  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_conv : 2;    /* (files) crlf->newline hackery */
  57         unsigned i_ea_mode : 1; /* file's permission is stored in ea */
  58         unsigned i_ea_uid : 1;  /* file's uid is stored in ea */
  59         unsigned i_ea_gid : 1;  /* file's gid is stored in ea */
  60         unsigned i_dirty : 1;
  61         struct mutex i_mutex;
  62         struct mutex i_parent_mutex;
  63         loff_t **i_rddir_off;
  64         struct inode vfs_inode;
  65 };
  66
  67 struct hpfs_sb_info {
  68         ino_t sb_root;                  /* inode number of root dir */
  69         unsigned sb_fs_size;            /* file system size, sectors */
  70         unsigned sb_bitmaps;            /* sector number of bitmap list */
  71         unsigned sb_dirband_start;      /* directory band start sector */
  72         unsigned sb_dirband_size;       /* directory band size, dnodes */
  73         unsigned sb_dmap;               /* sector number of dnode bit map */
  74         unsigned sb_n_free;             /* free blocks for statfs, or -1 */
  75         unsigned sb_n_free_dnodes;      /* free dnodes for statfs, or -1 */
  76         uid_t sb_uid;                   /* uid from mount options */
  77         gid_t sb_gid;                   /* gid from mount options */
  78         umode_t sb_mode;                /* mode from mount options */
  79         unsigned sb_conv : 2;           /* crlf->newline hackery */
  80         unsigned sb_eas : 2;            /* eas: 0-ignore, 1-ro, 2-rw */
  81         unsigned sb_err : 2;            /* on errs: 0-cont, 1-ro, 2-panic */
  82         unsigned sb_chk : 2;            /* checks: 0-no, 1-normal, 2-strict */
  83         unsigned sb_lowercase : 1;      /* downcase filenames hackery */
  84         unsigned sb_was_error : 1;      /* there was an error, set dirty flag */
  85         unsigned sb_chkdsk : 2;         /* chkdsk: 0-no, 1-on errs, 2-allways */
  86         unsigned char *sb_cp_table;     /* code page tables: */
  87                                         /*      128 bytes uppercasing table & */
  88                                         /*      128 bytes lowercasing table */
  89         unsigned *sb_bmp_dir;           /* main bitmap directory */
  90         unsigned sb_c_bitmap;           /* current bitmap */
  91         unsigned sb_max_fwd_alloc;      /* max forwad allocation */
  92         struct semaphore hpfs_creation_de; /* when creating dirents, nobody else
  93                                            can alloc blocks */
  94         /*unsigned sb_mounting : 1;*/
  95         int sb_timeshift;
  96 };
  97
  98 /*
  99  * conv= options
 100  */
 101
 102 #define CONV_BINARY 0                   /* no conversion */
 103 #define CONV_TEXT 1                     /* crlf->newline */
 104 #define CONV_AUTO 2                     /* decide based on file contents */
 105
 106 /* Four 512-byte buffers and the 2k block obtained by concatenating them */
 107
 108 struct quad_buffer_head {
 109         struct buffer_head *bh[4];
 110         void *data;
 111 };
 112
 113 /* The b-tree down pointer from a dir entry */
 114
 115 static inline dnode_secno de_down_pointer (struct hpfs_dirent *de)
 116 {
 117   CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n"));
 118   return *(dnode_secno *) ((void *) de + de->length - 4);
 119 }
 120
 121 /* The first dir entry in a dnode */
 122
 123 static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode)
 124 {
 125   return (void *) dnode->dirent;
 126 }
 127
 128 /* The end+1 of the dir entries */
 129
 130 static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode)
 131 {
 132   CHKCOND(dnode->first_free>=0x14 && dnode->first_free<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %d\n",(int)dnode->first_free));
 133   return (void *) dnode + dnode->first_free;
 134 }
 135
 136 /* The dir entry after dir entry de */
 137
 138 static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de)
 139 {
 140   CHKCOND(de->length>=0x20 && de->length<0x800,("HPFS: de_next_de: de->length = %d\n",(int)de->length));
 141   return (void *) de + de->length;
 142 }
 143
 144 static inline struct extended_attribute *fnode_ea(struct fnode *fnode)
 145 {
 146         return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s);
 147 }
 148
 149 static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode)
 150 {
 151         return (struct extended_attribute *)((char *)fnode + fnode->ea_offs + fnode->acl_size_s + fnode->ea_size_s);
 152 }
 153
 154 static inline struct extended_attribute *next_ea(struct extended_attribute *ea)
 155 {
 156         return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea->valuelen);
 157 }
 158
 159 static inline secno ea_sec(struct extended_attribute *ea)
 160 {
 161         return *(secno *)((char *)ea + 9 + ea->namelen);
 162 }
 163
 164 static inline secno ea_len(struct extended_attribute *ea)
 165 {
 166         return *(secno *)((char *)ea + 5 + ea->namelen);
 167 }
 168
 169 static inline char *ea_data(struct extended_attribute *ea)
 170 {
 171         return (char *)((char *)ea + 5 + ea->namelen);
 172 }
 173
 174 static inline unsigned de_size(int namelen, secno down_ptr)
 175 {
 176         return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
 177 }
 178
 179 static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src)
 180 {
 181         int a;
 182         int n;
 183         if (!dst || !src) return;
 184         a = dst->down;
 185         n = dst->not_8x3;
 186         memcpy((char *)dst + 2, (char *)src + 2, 28);
 187         dst->down = a;
 188         dst->not_8x3 = n;
 189 }
 190
 191 static inline unsigned tstbits(unsigned *bmp, unsigned b, unsigned n)
 192 {
 193         int i;
 194         if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n;
 195         if (!((bmp[(b & 0x3fff) >> 5] >> (b & 0x1f)) & 1)) return 1;
 196         for (i = 1; i < n; i++)
 197                 if (/*b+i < 0x4000 &&*/ !((bmp[((b+i) & 0x3fff) >> 5] >> ((b+i) & 0x1f)) & 1))
 198                         return i + 1;
 199         return 0;
 200 }
 201
 202 /* alloc.c */
 203
 204 int hpfs_chk_sectors(struct super_block *, secno, int, char *);
 205 secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
 206 int hpfs_alloc_if_possible(struct super_block *, secno);
 207 void hpfs_free_sectors(struct super_block *, secno, unsigned);
 208 int hpfs_check_free_dnodes(struct super_block *, int);
 209 void hpfs_free_dnode(struct super_block *, secno);
 210 struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
 211 struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
 212 struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
 213
 214 /* anode.c */
 215
 216 secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
 217 secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
 218 void hpfs_remove_btree(struct super_block *, struct bplus_header *);
 219 int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
 220 int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
 221 void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
 222 void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
 223 void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
 224
 225 /* buffer.c */
 226
 227 void hpfs_lock_creation(struct super_block *);
 228 void hpfs_unlock_creation(struct super_block *);
 229 void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
 230 void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
 231 void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
 232 void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
 233 void hpfs_brelse4(struct quad_buffer_head *);
 234 void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
 235
 236 /* dentry.c */
 237
 238 void hpfs_set_dentry_operations(struct dentry *);
 239
 240 /* dir.c */
 241
 242 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
 243 extern const struct file_operations hpfs_dir_ops;
 244
 245 /* dnode.c */
 246
 247 void hpfs_add_pos(struct inode *, loff_t *);
 248 void hpfs_del_pos(struct inode *, loff_t *);
 249 struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
 250 int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, 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, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
 256 void hpfs_remove_dtree(struct super_block *, dnode_secno);
 257 struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
 258
 259 /* ea.c */
 260
 261 void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
 262 int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
 263 char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
 264 void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
 265
 266 /* file.c */
 267
 268 int hpfs_file_fsync(struct file *, struct dentry *, int);
 269 extern const struct file_operations hpfs_file_ops;
 270 extern struct inode_operations hpfs_file_iops;
 271 extern struct address_space_operations hpfs_aops;
 272
 273 /* inode.c */
 274
 275 void hpfs_init_inode(struct inode *);
 276 void hpfs_read_inode(struct inode *);
 277 void hpfs_write_inode(struct inode *);
 278 void hpfs_write_inode_nolock(struct inode *);
 279 int hpfs_notify_change(struct dentry *, struct iattr *);
 280 void hpfs_write_if_changed(struct inode *);
 281 void hpfs_delete_inode(struct inode *);
 282
 283 /* map.c */
 284
 285 unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
 286 unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
 287 char *hpfs_load_code_page(struct super_block *, secno);
 288 secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
 289 struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
 290 struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
 291 struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
 292 dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
 293
 294 /* name.c */
 295
 296 unsigned char hpfs_upcase(unsigned char *, unsigned char);
 297 int hpfs_chk_name(unsigned char *, unsigned *);
 298 char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
 299 int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
 300 int hpfs_is_name_long(unsigned char *, unsigned);
 301 void hpfs_adjust_length(unsigned char *, unsigned *);
 302 void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
 303
 304 /* namei.c */
 305
 306 extern struct inode_operations hpfs_dir_iops;
 307 extern struct address_space_operations hpfs_symlink_aops;
 308
 309 static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
 310 {
 311         return list_entry(inode, struct hpfs_inode_info, vfs_inode);
 312 }
 313
 314 static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
 315 {
 316         return sb->s_fs_info;
 317 }
 318
 319 /* super.c */
 320
 321 void hpfs_error(struct super_block *, char *, ...);
 322 int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
 323 unsigned hpfs_count_one_bitmap(struct super_block *, secno);
 324
 325 /*
 326  * local time (HPFS) to GMT (Unix)
 327  */
 328
 329 static inline time_t local_to_gmt(struct super_block *s, time32_t t)
 330 {
 331         extern struct timezone sys_tz;
 332         return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift;
 333 }
 334
 335 static inline time32_t gmt_to_local(struct super_block *s, time_t t)
 336 {
 337         extern struct timezone sys_tz;
 338         return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift;
 339 }