LXR linux/fs/hpfs/hpfs

   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#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
  45struct 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 mutex i_mutex;
  61        struct mutex i_parent_mutex;
  62        loff_t **i_rddir_off;
  63        struct inode vfs_inode;
  64};
  65
  66struct 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
 107struct 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
 114static 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
 122static 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
 129static 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
 137static 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
 143static 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
 148static 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
 153static 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
 158static inline secno ea_sec(struct extended_attribute *ea)
 159{
 160        return *(secno *)((char *)ea + 9 + ea->namelen);
 161}
 162
 163static inline secno ea_len(struct extended_attribute *ea)
 164{
 165        return *(secno *)((char *)ea + 5 + ea->namelen);
 166}
 167
 168static inline char *ea_data(struct extended_attribute *ea)
 169{
 170        return (char *)((char *)ea + 5 + ea->namelen);
 171}
 172
 173static inline unsigned de_size(int namelen, secno down_ptr)
 174{
 175        return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0);
 176}
 177
 178static 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
 190static 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
 203int hpfs_chk_sectors(struct super_block *, secno, int, char *);
 204secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int);
 205int hpfs_alloc_if_possible(struct super_block *, secno);
 206void hpfs_free_sectors(struct super_block *, secno, unsigned);
 207int hpfs_check_free_dnodes(struct super_block *, int);
 208void hpfs_free_dnode(struct super_block *, secno);
 209struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int);
 210struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **);
 211struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **);
 212
 213/* anode.c */
 214
 215secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *);
 216secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned);
 217void hpfs_remove_btree(struct super_block *, struct bplus_header *);
 218int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *);
 219int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, char *);
 220void hpfs_ea_remove(struct super_block *, secno, int, unsigned);
 221void hpfs_truncate_btree(struct super_block *, secno, int, unsigned);
 222void hpfs_remove_fnode(struct super_block *, fnode_secno fno);
 223
 224/* buffer.c */
 225
 226void hpfs_lock_creation(struct super_block *);
 227void hpfs_unlock_creation(struct super_block *);
 228void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int);
 229void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **);
 230void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int);
 231void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *);
 232void hpfs_brelse4(struct quad_buffer_head *);
 233void hpfs_mark_4buffers_dirty(struct quad_buffer_head *);
 234
 235/* dentry.c */
 236
 237void hpfs_set_dentry_operations(struct dentry *);
 238
 239/* dir.c */
 240
 241struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
 242extern const struct file_operations hpfs_dir_ops;
 243
 244/* dnode.c */
 245
 246void hpfs_add_pos(struct inode *, loff_t *);
 247void hpfs_del_pos(struct inode *, loff_t *);
 248struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, unsigned char *, unsigned, secno);
 249int hpfs_add_dirent(struct inode *, unsigned char *, unsigned, struct hpfs_dirent *, int);
 250int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int);
 251void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *);
 252dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno);
 253struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *);
 254struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, char *, unsigned, dnode_secno *, struct quad_buffer_head *);
 255void hpfs_remove_dtree(struct super_block *, dnode_secno);
 256struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *);
 257
 258/* ea.c */
 259
 260void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned);
 261int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int);
 262char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *);
 263void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
 264
 265/* file.c */
 266
 267int hpfs_file_fsync(struct file *, struct dentry *, int);
 268extern const struct file_operations hpfs_file_ops;
 269extern const struct inode_operations hpfs_file_iops;
 270extern const struct address_space_operations hpfs_aops;
 271
 272/* inode.c */
 273
 274void hpfs_init_inode(struct inode *);
 275void hpfs_read_inode(struct inode *);
 276void hpfs_write_inode(struct inode *);
 277void hpfs_write_inode_nolock(struct inode *);
 278int hpfs_setattr(struct dentry *, struct iattr *);
 279void hpfs_write_if_changed(struct inode *);
 280void hpfs_delete_inode(struct inode *);
 281
 282/* map.c */
 283
 284unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *);
 285unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *);
 286char *hpfs_load_code_page(struct super_block *, secno);
 287secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp);
 288struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **);
 289struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **);
 290struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *);
 291dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino);
 292
 293/* name.c */
 294
 295unsigned char hpfs_upcase(unsigned char *, unsigned char);
 296int hpfs_chk_name(unsigned char *, unsigned *);
 297char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int);
 298int hpfs_compare_names(struct super_block *, unsigned char *, unsigned, unsigned char *, unsigned, int);
 299int hpfs_is_name_long(unsigned char *, unsigned);
 300void hpfs_adjust_length(unsigned char *, unsigned *);
 301void hpfs_decide_conv(struct inode *, unsigned char *, unsigned);
 302
 303/* namei.c */
 304
 305extern const struct inode_operations hpfs_dir_iops;
 306extern const struct address_space_operations hpfs_symlink_aops;
 307
 308static inline struct hpfs_inode_info *hpfs_i(struct inode *inode)
 309{
 310        return list_entry(inode, struct hpfs_inode_info, vfs_inode);
 311}
 312
 313static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb)
 314{
 315        return sb->s_fs_info;
 316}
 317
 318/* super.c */
 319
 320void hpfs_error(struct super_block *, const char *, ...)
 321        __attribute__((format (printf, 2, 3)));
 322int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *);
 323unsigned hpfs_count_one_bitmap(struct super_block *, secno);
 324
 325/*
 326 * local time (HPFS) to GMT (Unix)
 327 */
 328
 329static 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
 335static 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}
 340