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 44struct 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 65struct 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 semaphore 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 106struct 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 113static 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 121static 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 128static 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 136static 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 142static 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 147static 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 152static 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 157static inline secno ea_sec(struct extended_attribute *ea) 158{ 159 return *(secno *)((char *)ea + 9 + ea->namelen); 160} 161 162static inline secno ea_len(struct extended_attribute *ea) 163{ 164 return *(secno *)((char *)ea + 5 + ea->namelen); 165} 166 167static inline char *ea_data(struct extended_attribute *ea) 168{ 169 return (char *)((char *)ea + 5 + ea->namelen); 170} 171 172static inline unsigned de_size(int namelen, secno down_ptr) 173{ 174 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 175} 176 177static 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 189static 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 202int hpfs_chk_sectors(struct super_block *, secno, int, char *); 203secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int); 204int hpfs_alloc_if_possible(struct super_block *, secno); 205void hpfs_free_sectors(struct super_block *, secno, unsigned); 206int hpfs_check_free_dnodes(struct super_block *, int); 207void hpfs_free_dnode(struct super_block *, secno); 208struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int); 209struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 210struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 211 212/* anode.c */ 213 214secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 215secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 216void hpfs_remove_btree(struct super_block *, struct bplus_header *); 217int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 218int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); 219void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 220void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 221void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 222 223/* buffer.c */ 224 225void hpfs_lock_creation(struct super_block *); 226void hpfs_unlock_creation(struct super_block *); 227void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); 228void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); 229void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); 230void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); 231void hpfs_brelse4(struct quad_buffer_head *); 232void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); 233 234/* dentry.c */ 235 236void hpfs_set_dentry_operations(struct dentry *); 237 238/* dir.c */ 239 240struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); 241extern const struct file_operations hpfs_dir_ops; 242 243/* dnode.c */ 244 245void hpfs_add_pos(struct inode *, loff_t *); 246void hpfs_del_pos(struct inode *, loff_t *); 247struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, 248 const unsigned char *, unsigned, secno); 249int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, 250 struct hpfs_dirent *, int); 251int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); 252void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); 253dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); 254struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); 255struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, 256 const unsigned char *, unsigned, dnode_secno *, 257 struct quad_buffer_head *); 258void hpfs_remove_dtree(struct super_block *, dnode_secno); 259struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 260 261/* ea.c */ 262 263void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 264int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 265char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 266void hpfs_set_ea(struct inode *, struct fnode *, const char *, 267 const char *, int); 268 269/* file.c */ 270 271int hpfs_file_fsync(struct file *, int); 272extern const struct file_operations hpfs_file_ops; 273extern const struct inode_operations hpfs_file_iops; 274extern const struct address_space_operations hpfs_aops; 275 276/* inode.c */ 277 278void hpfs_init_inode(struct inode *); 279void hpfs_read_inode(struct inode *); 280void hpfs_write_inode(struct inode *); 281void hpfs_write_inode_nolock(struct inode *); 282int hpfs_setattr(struct dentry *, struct iattr *); 283void hpfs_write_if_changed(struct inode *); 284void hpfs_evict_inode(struct inode *); 285 286/* map.c */ 287 288unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 289unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 290unsigned char *hpfs_load_code_page(struct super_block *, secno); 291secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 292struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 293struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 294struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 295dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 296 297/* name.c */ 298 299unsigned char hpfs_upcase(unsigned char *, unsigned char); 300int hpfs_chk_name(const unsigned char *, unsigned *); 301unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 302int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, 303 const unsigned char *, unsigned, int); 304int hpfs_is_name_long(const unsigned char *, unsigned); 305void hpfs_adjust_length(const unsigned char *, unsigned *); 306void hpfs_decide_conv(struct inode *, const unsigned char *, unsigned); 307 308/* namei.c */ 309 310extern const struct inode_operations hpfs_dir_iops; 311extern const struct address_space_operations hpfs_symlink_aops; 312 313static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 314{ 315 return list_entry(inode, struct hpfs_inode_info, vfs_inode); 316} 317 318static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 319{ 320 return sb->s_fs_info; 321} 322 323/* super.c */ 324 325void hpfs_error(struct super_block *, const char *, ...) 326 __attribute__((format (printf, 2, 3))); 327int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 328unsigned hpfs_count_one_bitmap(struct super_block *, secno); 329 330/* 331 * local time (HPFS) to GMT (Unix) 332 */ 333 334static 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 340static 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