Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Ingo Molnar | 7bf6d78 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 12 | #include <linux/mutex.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | #include <linux/pagemap.h> |
| 14 | #include <linux/buffer_head.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 44 | struct 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; |
Ingo Molnar | 7bf6d78 | 2006-03-23 03:00:42 -0800 | [diff] [blame] | 59 | struct mutex i_mutex; |
| 60 | struct mutex i_parent_mutex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | loff_t **i_rddir_off; |
| 62 | struct inode vfs_inode; |
| 63 | }; |
| 64 | |
| 65 | struct 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 | |
| 106 | struct 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 | |
| 113 | static 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 | |
| 121 | static 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 | |
| 128 | static 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 | |
| 136 | static 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 | |
| 142 | static 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 | |
| 147 | static 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 | |
| 152 | static 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 | |
| 157 | static inline secno ea_sec(struct extended_attribute *ea) |
| 158 | { |
| 159 | return *(secno *)((char *)ea + 9 + ea->namelen); |
| 160 | } |
| 161 | |
| 162 | static inline secno ea_len(struct extended_attribute *ea) |
| 163 | { |
| 164 | return *(secno *)((char *)ea + 5 + ea->namelen); |
| 165 | } |
| 166 | |
| 167 | static inline char *ea_data(struct extended_attribute *ea) |
| 168 | { |
| 169 | return (char *)((char *)ea + 5 + ea->namelen); |
| 170 | } |
| 171 | |
| 172 | static inline unsigned de_size(int namelen, secno down_ptr) |
| 173 | { |
| 174 | return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); |
| 175 | } |
| 176 | |
| 177 | static 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 | |
| 189 | static 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 | |
| 202 | int hpfs_chk_sectors(struct super_block *, secno, int, char *); |
| 203 | secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int, int); |
| 204 | int hpfs_alloc_if_possible(struct super_block *, secno); |
| 205 | void hpfs_free_sectors(struct super_block *, secno, unsigned); |
| 206 | int hpfs_check_free_dnodes(struct super_block *, int); |
| 207 | void hpfs_free_dnode(struct super_block *, secno); |
| 208 | struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *, int); |
| 209 | struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); |
| 210 | struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); |
| 211 | |
| 212 | /* anode.c */ |
| 213 | |
| 214 | secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); |
| 215 | secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); |
| 216 | void hpfs_remove_btree(struct super_block *, struct bplus_header *); |
| 217 | int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); |
Al Viro | 7e7742e | 2010-01-31 17:09:29 -0500 | [diff] [blame] | 218 | int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | void hpfs_ea_remove(struct super_block *, secno, int, unsigned); |
| 220 | void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); |
| 221 | void hpfs_remove_fnode(struct super_block *, fnode_secno fno); |
| 222 | |
| 223 | /* buffer.c */ |
| 224 | |
| 225 | void hpfs_lock_creation(struct super_block *); |
| 226 | void hpfs_unlock_creation(struct super_block *); |
| 227 | void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); |
| 228 | void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); |
| 229 | void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); |
| 230 | void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); |
| 231 | void hpfs_brelse4(struct quad_buffer_head *); |
| 232 | void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); |
| 233 | |
| 234 | /* dentry.c */ |
| 235 | |
| 236 | void hpfs_set_dentry_operations(struct dentry *); |
| 237 | |
| 238 | /* dir.c */ |
| 239 | |
| 240 | struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 241 | extern const struct file_operations hpfs_dir_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | |
| 243 | /* dnode.c */ |
| 244 | |
| 245 | void hpfs_add_pos(struct inode *, loff_t *); |
| 246 | void hpfs_del_pos(struct inode *, loff_t *); |
Al Viro | 7e7742e | 2010-01-31 17:09:29 -0500 | [diff] [blame] | 247 | struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, |
| 248 | const unsigned char *, unsigned, secno); |
| 249 | int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, |
| 250 | struct hpfs_dirent *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 *); |
Al Viro | 7e7742e | 2010-01-31 17:09:29 -0500 | [diff] [blame] | 255 | struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, |
| 256 | const unsigned char *, unsigned, dnode_secno *, |
| 257 | struct quad_buffer_head *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | void hpfs_remove_dtree(struct super_block *, dnode_secno); |
| 259 | struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); |
| 260 | |
| 261 | /* ea.c */ |
| 262 | |
| 263 | void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); |
| 264 | int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); |
| 265 | char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); |
Al Viro | 7e7742e | 2010-01-31 17:09:29 -0500 | [diff] [blame] | 266 | void hpfs_set_ea(struct inode *, struct fnode *, const char *, |
| 267 | const char *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | |
| 269 | /* file.c */ |
| 270 | |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 271 | int hpfs_file_fsync(struct file *, int); |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 272 | extern const struct file_operations hpfs_file_ops; |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 273 | extern const struct inode_operations hpfs_file_iops; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 274 | extern const struct address_space_operations hpfs_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | |
| 276 | /* inode.c */ |
| 277 | |
| 278 | void hpfs_init_inode(struct inode *); |
| 279 | void hpfs_read_inode(struct inode *); |
| 280 | void hpfs_write_inode(struct inode *); |
| 281 | void hpfs_write_inode_nolock(struct inode *); |
Christoph Hellwig | ca30bc9 | 2008-08-11 00:27:59 +0200 | [diff] [blame] | 282 | int hpfs_setattr(struct dentry *, struct iattr *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | void hpfs_write_if_changed(struct inode *); |
| 284 | void hpfs_delete_inode(struct inode *); |
| 285 | |
| 286 | /* map.c */ |
| 287 | |
| 288 | unsigned *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); |
| 289 | unsigned *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); |
Al Viro | 7e7742e | 2010-01-31 17:09:29 -0500 | [diff] [blame] | 290 | unsigned char *hpfs_load_code_page(struct super_block *, secno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | secno *hpfs_load_bitmap_directory(struct super_block *, secno bmp); |
| 292 | struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); |
| 293 | struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); |
| 294 | struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); |
| 295 | dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); |
| 296 | |
| 297 | /* name.c */ |
| 298 | |
| 299 | unsigned char hpfs_upcase(unsigned char *, unsigned char); |
Al Viro | 7e7742e | 2010-01-31 17:09:29 -0500 | [diff] [blame] | 300 | int hpfs_chk_name(const unsigned char *, unsigned *); |
| 301 | unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); |
| 302 | int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, |
| 303 | const unsigned char *, unsigned, int); |
| 304 | int hpfs_is_name_long(const unsigned char *, unsigned); |
| 305 | void hpfs_adjust_length(const unsigned char *, unsigned *); |
| 306 | void hpfs_decide_conv(struct inode *, const unsigned char *, unsigned); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | |
| 308 | /* namei.c */ |
| 309 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 310 | extern const struct inode_operations hpfs_dir_iops; |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 311 | extern const struct address_space_operations hpfs_symlink_aops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
| 313 | static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) |
| 314 | { |
| 315 | return list_entry(inode, struct hpfs_inode_info, vfs_inode); |
| 316 | } |
| 317 | |
| 318 | static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) |
| 319 | { |
| 320 | return sb->s_fs_info; |
| 321 | } |
| 322 | |
| 323 | /* super.c */ |
| 324 | |
Alexey Dobriyan | 352d94d | 2006-12-06 20:37:04 -0800 | [diff] [blame] | 325 | void hpfs_error(struct super_block *, const char *, ...) |
| 326 | __attribute__((format (printf, 2, 3))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); |
| 328 | unsigned hpfs_count_one_bitmap(struct super_block *, secno); |
| 329 | |
| 330 | /* |
| 331 | * local time (HPFS) to GMT (Unix) |
| 332 | */ |
| 333 | |
| 334 | static 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 | |
| 340 | static 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 | } |