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_notify_change(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