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#ifdef pr_fmt 12#undef pr_fmt 13#endif 14 15#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17#include <linux/mutex.h> 18#include <linux/pagemap.h> 19#include <linux/buffer_head.h> 20#include <linux/slab.h> 21#include <asm/unaligned.h> 22 23#include "hpfs.h" 24 25#define EIOERROR EIO 26#define EFSERROR EPERM 27#define EMEMERROR ENOMEM 28 29#define ANODE_ALLOC_FWD 512 30#define FNODE_ALLOC_FWD 0 31#define ALLOC_FWD_MIN 16 32#define ALLOC_FWD_MAX 128 33#define ALLOC_M 1 34#define FNODE_RD_AHEAD 16 35#define ANODE_RD_AHEAD 0 36#define DNODE_RD_AHEAD 72 37#define COUNT_RD_AHEAD 62 38 39#define FREE_DNODES_ADD 58 40#define FREE_DNODES_DEL 29 41 42#define CHKCOND(x,y) if (!(x)) printk y 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_ea_mode : 1; /* file's permission is stored in ea */ 55 unsigned i_ea_uid : 1; /* file's uid is stored in ea */ 56 unsigned i_ea_gid : 1; /* file's gid is stored in ea */ 57 unsigned i_dirty : 1; 58 loff_t **i_rddir_off; 59 struct inode vfs_inode; 60}; 61 62struct hpfs_sb_info { 63 struct mutex hpfs_mutex; /* global hpfs lock */ 64 ino_t sb_root; /* inode number of root dir */ 65 unsigned sb_fs_size; /* file system size, sectors */ 66 unsigned sb_bitmaps; /* sector number of bitmap list */ 67 unsigned sb_dirband_start; /* directory band start sector */ 68 unsigned sb_dirband_size; /* directory band size, dnodes */ 69 unsigned sb_dmap; /* sector number of dnode bit map */ 70 unsigned sb_n_free; /* free blocks for statfs, or -1 */ 71 unsigned sb_n_free_dnodes; /* free dnodes for statfs, or -1 */ 72 kuid_t sb_uid; /* uid from mount options */ 73 kgid_t sb_gid; /* gid from mount options */ 74 umode_t sb_mode; /* mode from mount options */ 75 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ 76 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ 77 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ 78 unsigned sb_lowercase : 1; /* downcase filenames hackery */ 79 unsigned sb_was_error : 1; /* there was an error, set dirty flag */ 80 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ 81 unsigned char *sb_cp_table; /* code page tables: */ 82 /* 128 bytes uppercasing table & */ 83 /* 128 bytes lowercasing table */ 84 __le32 *sb_bmp_dir; /* main bitmap directory */ 85 unsigned sb_c_bitmap; /* current bitmap */ 86 unsigned sb_max_fwd_alloc; /* max forwad allocation */ 87 int sb_timeshift; 88 struct rcu_head rcu; 89}; 90 91/* Four 512-byte buffers and the 2k block obtained by concatenating them */ 92 93struct quad_buffer_head { 94 struct buffer_head *bh[4]; 95 void *data; 96}; 97 98/* The b-tree down pointer from a dir entry */ 99 100static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 101{ 102 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 103 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4)); 104} 105 106/* The first dir entry in a dnode */ 107 108static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) 109{ 110 return (void *) dnode->dirent; 111} 112 113/* The end+1 of the dir entries */ 114 115static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 116{ 117 CHKCOND(le32_to_cpu(dnode->first_free)>=0x14 && le32_to_cpu(dnode->first_free)<=0xa00,("HPFS: dnode_end_de: dnode->first_free = %x\n",(unsigned)le32_to_cpu(dnode->first_free))); 118 return (void *) dnode + le32_to_cpu(dnode->first_free); 119} 120 121/* The dir entry after dir entry de */ 122 123static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 124{ 125 CHKCOND(le16_to_cpu(de->length)>=0x20 && le16_to_cpu(de->length)<0x800,("HPFS: de_next_de: de->length = %x\n",(unsigned)le16_to_cpu(de->length))); 126 return (void *) de + le16_to_cpu(de->length); 127} 128 129static inline struct extended_attribute *fnode_ea(struct fnode *fnode) 130{ 131 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); 132} 133 134static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 135{ 136 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s) + le16_to_cpu(fnode->ea_size_s)); 137} 138 139static unsigned ea_valuelen(struct extended_attribute *ea) 140{ 141 return ea->valuelen_lo + 256 * ea->valuelen_hi; 142} 143 144static inline struct extended_attribute *next_ea(struct extended_attribute *ea) 145{ 146 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); 147} 148 149static inline secno ea_sec(struct extended_attribute *ea) 150{ 151 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen))); 152} 153 154static inline secno ea_len(struct extended_attribute *ea) 155{ 156 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen))); 157} 158 159static inline char *ea_data(struct extended_attribute *ea) 160{ 161 return (char *)((char *)ea + 5 + ea->namelen); 162} 163 164static inline unsigned de_size(int namelen, secno down_ptr) 165{ 166 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 167} 168 169static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 170{ 171 int a; 172 int n; 173 if (!dst || !src) return; 174 a = dst->down; 175 n = dst->not_8x3; 176 memcpy((char *)dst + 2, (char *)src + 2, 28); 177 dst->down = a; 178 dst->not_8x3 = n; 179} 180 181static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n) 182{ 183 int i; 184 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 185 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; 186 for (i = 1; i < n; i++) 187 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1)) 188 return i + 1; 189 return 0; 190} 191 192/* alloc.c */ 193 194int hpfs_chk_sectors(struct super_block *, secno, int, char *); 195secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int); 196int hpfs_alloc_if_possible(struct super_block *, secno); 197void hpfs_free_sectors(struct super_block *, secno, unsigned); 198int hpfs_check_free_dnodes(struct super_block *, int); 199void hpfs_free_dnode(struct super_block *, secno); 200struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *); 201struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 202struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 203 204/* anode.c */ 205 206secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 207secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 208void hpfs_remove_btree(struct super_block *, struct bplus_header *); 209int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 210int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); 211void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 212void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 213void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 214 215/* buffer.c */ 216 217void hpfs_prefetch_sectors(struct super_block *, unsigned, int); 218void *hpfs_map_sector(struct super_block *, unsigned, struct buffer_head **, int); 219void *hpfs_get_sector(struct super_block *, unsigned, struct buffer_head **); 220void *hpfs_map_4sectors(struct super_block *, unsigned, struct quad_buffer_head *, int); 221void *hpfs_get_4sectors(struct super_block *, unsigned, struct quad_buffer_head *); 222void hpfs_brelse4(struct quad_buffer_head *); 223void hpfs_mark_4buffers_dirty(struct quad_buffer_head *); 224 225/* dentry.c */ 226 227extern const struct dentry_operations hpfs_dentry_operations; 228 229/* dir.c */ 230 231struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int); 232extern const struct file_operations hpfs_dir_ops; 233 234/* dnode.c */ 235 236void hpfs_add_pos(struct inode *, loff_t *); 237void hpfs_del_pos(struct inode *, loff_t *); 238struct hpfs_dirent *hpfs_add_de(struct super_block *, struct dnode *, 239 const unsigned char *, unsigned, secno); 240int hpfs_add_dirent(struct inode *, const unsigned char *, unsigned, 241 struct hpfs_dirent *); 242int hpfs_remove_dirent(struct inode *, dnode_secno, struct hpfs_dirent *, struct quad_buffer_head *, int); 243void hpfs_count_dnodes(struct super_block *, dnode_secno, int *, int *, int *); 244dnode_secno hpfs_de_as_down_as_possible(struct super_block *, dnode_secno dno); 245struct hpfs_dirent *map_pos_dirent(struct inode *, loff_t *, struct quad_buffer_head *); 246struct hpfs_dirent *map_dirent(struct inode *, dnode_secno, 247 const unsigned char *, unsigned, dnode_secno *, 248 struct quad_buffer_head *); 249void hpfs_remove_dtree(struct super_block *, dnode_secno); 250struct hpfs_dirent *map_fnode_dirent(struct super_block *, fnode_secno, struct fnode *, struct quad_buffer_head *); 251 252/* ea.c */ 253 254void hpfs_ea_ext_remove(struct super_block *, secno, int, unsigned); 255int hpfs_read_ea(struct super_block *, struct fnode *, char *, char *, int); 256char *hpfs_get_ea(struct super_block *, struct fnode *, char *, int *); 257void hpfs_set_ea(struct inode *, struct fnode *, const char *, 258 const char *, int); 259 260/* file.c */ 261 262int hpfs_file_fsync(struct file *, loff_t, loff_t, int); 263void hpfs_truncate(struct inode *); 264extern const struct file_operations hpfs_file_ops; 265extern const struct inode_operations hpfs_file_iops; 266extern const struct address_space_operations hpfs_aops; 267 268/* inode.c */ 269 270void hpfs_init_inode(struct inode *); 271void hpfs_read_inode(struct inode *); 272void hpfs_write_inode(struct inode *); 273void hpfs_write_inode_nolock(struct inode *); 274int hpfs_setattr(struct dentry *, struct iattr *); 275void hpfs_write_if_changed(struct inode *); 276void hpfs_evict_inode(struct inode *); 277 278/* map.c */ 279 280__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 281__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 282void hpfs_prefetch_bitmap(struct super_block *, unsigned); 283unsigned char *hpfs_load_code_page(struct super_block *, secno); 284__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 285struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 286struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 287struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 288dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 289 290/* name.c */ 291 292unsigned char hpfs_upcase(unsigned char *, unsigned char); 293int hpfs_chk_name(const unsigned char *, unsigned *); 294unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 295int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, 296 const unsigned char *, unsigned, int); 297int hpfs_is_name_long(const unsigned char *, unsigned); 298void hpfs_adjust_length(const unsigned char *, unsigned *); 299 300/* namei.c */ 301 302extern const struct inode_operations hpfs_dir_iops; 303extern const struct address_space_operations hpfs_symlink_aops; 304 305static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 306{ 307 return list_entry(inode, struct hpfs_inode_info, vfs_inode); 308} 309 310static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 311{ 312 return sb->s_fs_info; 313} 314 315/* super.c */ 316 317__printf(2, 3) 318void hpfs_error(struct super_block *, const char *, ...); 319int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 320unsigned hpfs_get_free_dnodes(struct super_block *); 321 322/* 323 * local time (HPFS) to GMT (Unix) 324 */ 325 326static inline time_t local_to_gmt(struct super_block *s, time32_t t) 327{ 328 extern struct timezone sys_tz; 329 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; 330} 331 332static inline time32_t gmt_to_local(struct super_block *s, time_t t) 333{ 334 extern struct timezone sys_tz; 335 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; 336} 337 338/* 339 * Locking: 340 * 341 * hpfs_lock() locks the whole filesystem. It must be taken 342 * on any method called by the VFS. 343 * 344 * We don't do any per-file locking anymore, it is hard to 345 * review and HPFS is not performance-sensitive anyway. 346 */ 347static inline void hpfs_lock(struct super_block *s) 348{ 349 struct hpfs_sb_info *sbi = hpfs_sb(s); 350 mutex_lock(&sbi->hpfs_mutex); 351} 352 353static inline void hpfs_unlock(struct super_block *s) 354{ 355 struct hpfs_sb_info *sbi = hpfs_sb(s); 356 mutex_unlock(&sbi->hpfs_mutex); 357} 358 359static inline void hpfs_lock_assert(struct super_block *s) 360{ 361 struct hpfs_sb_info *sbi = hpfs_sb(s); 362 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); 363} 364