1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * linux/fs/hpfs/hpfs_fn.h 4 * 5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 6 * 7 * function headers 8 */ 9 10//#define DBG 11//#define DEBUG_LOCKS 12#ifdef pr_fmt 13#undef pr_fmt 14#endif 15 16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 17 18#include <linux/mutex.h> 19#include <linux/pagemap.h> 20#include <linux/buffer_head.h> 21#include <linux/slab.h> 22#include <linux/sched/signal.h> 23#include <linux/blkdev.h> 24#include <asm/unaligned.h> 25 26#include "hpfs.h" 27 28#define EIOERROR EIO 29#define EFSERROR EUCLEAN 30 31#define ANODE_ALLOC_FWD 512 32#define FNODE_ALLOC_FWD 0 33#define ALLOC_FWD_MIN 16 34#define ALLOC_FWD_MAX 128 35#define ALLOC_M 1 36#define FNODE_RD_AHEAD 16 37#define ANODE_RD_AHEAD 0 38#define DNODE_RD_AHEAD 72 39#define COUNT_RD_AHEAD 62 40 41#define FREE_DNODES_ADD 58 42#define FREE_DNODES_DEL 29 43 44#define CHKCOND(x,y) if (!(x)) printk y 45 46struct hpfs_inode_info { 47 loff_t mmu_private; 48 ino_t i_parent_dir; /* (directories) gives fnode of parent dir */ 49 unsigned i_dno; /* (directories) root dnode */ 50 unsigned i_dpos; /* (directories) temp for readdir */ 51 unsigned i_dsubdno; /* (directories) temp for readdir */ 52 unsigned i_file_sec; /* (files) minimalist cache of alloc info */ 53 unsigned i_disk_sec; /* (files) minimalist cache of alloc info */ 54 unsigned i_n_secs; /* (files) minimalist cache of alloc info */ 55 unsigned i_ea_size; /* size of extended attributes */ 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 loff_t **i_rddir_off; 61 struct inode vfs_inode; 62}; 63 64struct hpfs_sb_info { 65 struct mutex hpfs_mutex; /* global hpfs lock */ 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 kuid_t sb_uid; /* uid from mount options */ 75 kgid_t sb_gid; /* gid from mount options */ 76 umode_t sb_mode; /* mode from mount options */ 77 unsigned sb_eas : 2; /* eas: 0-ignore, 1-ro, 2-rw */ 78 unsigned sb_err : 2; /* on errs: 0-cont, 1-ro, 2-panic */ 79 unsigned sb_chk : 2; /* checks: 0-no, 1-normal, 2-strict */ 80 unsigned sb_lowercase : 1; /* downcase filenames hackery */ 81 unsigned sb_was_error : 1; /* there was an error, set dirty flag */ 82 unsigned sb_chkdsk : 2; /* chkdsk: 0-no, 1-on errs, 2-allways */ 83 unsigned char *sb_cp_table; /* code page tables: */ 84 /* 128 bytes uppercasing table & */ 85 /* 128 bytes lowercasing table */ 86 __le32 *sb_bmp_dir; /* main bitmap directory */ 87 unsigned sb_c_bitmap; /* current bitmap */ 88 unsigned sb_max_fwd_alloc; /* max forwad allocation */ 89 int sb_timeshift; 90 struct rcu_head rcu; 91 92 unsigned n_hotfixes; 93 secno hotfix_from[256]; 94 secno hotfix_to[256]; 95}; 96 97/* Four 512-byte buffers and the 2k block obtained by concatenating them */ 98 99struct quad_buffer_head { 100 struct buffer_head *bh[4]; 101 void *data; 102}; 103 104/* The b-tree down pointer from a dir entry */ 105 106static inline dnode_secno de_down_pointer (struct hpfs_dirent *de) 107{ 108 CHKCOND(de->down,("HPFS: de_down_pointer: !de->down\n")); 109 return le32_to_cpu(*(__le32 *) ((void *) de + le16_to_cpu(de->length) - 4)); 110} 111 112/* The first dir entry in a dnode */ 113 114static inline struct hpfs_dirent *dnode_first_de (struct dnode *dnode) 115{ 116 return (void *) dnode->dirent; 117} 118 119/* The end+1 of the dir entries */ 120 121static inline struct hpfs_dirent *dnode_end_de (struct dnode *dnode) 122{ 123 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))); 124 return (void *) dnode + le32_to_cpu(dnode->first_free); 125} 126 127/* The dir entry after dir entry de */ 128 129static inline struct hpfs_dirent *de_next_de (struct hpfs_dirent *de) 130{ 131 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))); 132 return (void *) de + le16_to_cpu(de->length); 133} 134 135static inline struct extended_attribute *fnode_ea(struct fnode *fnode) 136{ 137 return (struct extended_attribute *)((char *)fnode + le16_to_cpu(fnode->ea_offs) + le16_to_cpu(fnode->acl_size_s)); 138} 139 140static inline struct extended_attribute *fnode_end_ea(struct fnode *fnode) 141{ 142 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)); 143} 144 145static unsigned ea_valuelen(struct extended_attribute *ea) 146{ 147 return ea->valuelen_lo + 256 * ea->valuelen_hi; 148} 149 150static inline struct extended_attribute *next_ea(struct extended_attribute *ea) 151{ 152 return (struct extended_attribute *)((char *)ea + 5 + ea->namelen + ea_valuelen(ea)); 153} 154 155static inline secno ea_sec(struct extended_attribute *ea) 156{ 157 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 9 + ea->namelen))); 158} 159 160static inline secno ea_len(struct extended_attribute *ea) 161{ 162 return le32_to_cpu(get_unaligned((__le32 *)((char *)ea + 5 + ea->namelen))); 163} 164 165static inline char *ea_data(struct extended_attribute *ea) 166{ 167 return (char *)((char *)ea + 5 + ea->namelen); 168} 169 170static inline unsigned de_size(int namelen, secno down_ptr) 171{ 172 return ((0x1f + namelen + 3) & ~3) + (down_ptr ? 4 : 0); 173} 174 175static inline void copy_de(struct hpfs_dirent *dst, struct hpfs_dirent *src) 176{ 177 int a; 178 int n; 179 if (!dst || !src) return; 180 a = dst->down; 181 n = dst->not_8x3; 182 memcpy((char *)dst + 2, (char *)src + 2, 28); 183 dst->down = a; 184 dst->not_8x3 = n; 185} 186 187static inline unsigned tstbits(__le32 *bmp, unsigned b, unsigned n) 188{ 189 int i; 190 if ((b >= 0x4000) || (b + n - 1 >= 0x4000)) return n; 191 if (!((le32_to_cpu(bmp[(b & 0x3fff) >> 5]) >> (b & 0x1f)) & 1)) return 1; 192 for (i = 1; i < n; i++) 193 if (!((le32_to_cpu(bmp[((b+i) & 0x3fff) >> 5]) >> ((b+i) & 0x1f)) & 1)) 194 return i + 1; 195 return 0; 196} 197 198/* alloc.c */ 199 200int hpfs_chk_sectors(struct super_block *, secno, int, char *); 201secno hpfs_alloc_sector(struct super_block *, secno, unsigned, int); 202int hpfs_alloc_if_possible(struct super_block *, secno); 203void hpfs_free_sectors(struct super_block *, secno, unsigned); 204int hpfs_check_free_dnodes(struct super_block *, int); 205void hpfs_free_dnode(struct super_block *, secno); 206struct dnode *hpfs_alloc_dnode(struct super_block *, secno, dnode_secno *, struct quad_buffer_head *); 207struct fnode *hpfs_alloc_fnode(struct super_block *, secno, fnode_secno *, struct buffer_head **); 208struct anode *hpfs_alloc_anode(struct super_block *, secno, anode_secno *, struct buffer_head **); 209int hpfs_trim_fs(struct super_block *, u64, u64, u64, unsigned *); 210 211/* anode.c */ 212 213secno hpfs_bplus_lookup(struct super_block *, struct inode *, struct bplus_header *, unsigned, struct buffer_head *); 214secno hpfs_add_sector_to_btree(struct super_block *, secno, int, unsigned); 215void hpfs_remove_btree(struct super_block *, struct bplus_header *); 216int hpfs_ea_read(struct super_block *, secno, int, unsigned, unsigned, char *); 217int hpfs_ea_write(struct super_block *, secno, int, unsigned, unsigned, const char *); 218void hpfs_ea_remove(struct super_block *, secno, int, unsigned); 219void hpfs_truncate_btree(struct super_block *, secno, int, unsigned); 220void hpfs_remove_fnode(struct super_block *, fnode_secno fno); 221 222/* buffer.c */ 223 224secno hpfs_search_hotfix_map(struct super_block *s, secno sec); 225unsigned hpfs_search_hotfix_map_for_range(struct super_block *s, secno sec, unsigned n); 226void hpfs_prefetch_sectors(struct super_block *, unsigned, int); 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 236extern const struct dentry_operations hpfs_dentry_operations; 237 238/* dir.c */ 239 240struct dentry *hpfs_lookup(struct inode *, struct dentry *, unsigned int); 241extern const struct file_operations hpfs_dir_ops; 242 243/* dnode.c */ 244 245int 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 *); 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 *, loff_t, loff_t, int); 272void hpfs_truncate(struct inode *); 273extern const struct file_operations hpfs_file_ops; 274extern const struct inode_operations hpfs_file_iops; 275extern const struct address_space_operations hpfs_aops; 276 277/* inode.c */ 278 279void hpfs_init_inode(struct inode *); 280void hpfs_read_inode(struct inode *); 281void hpfs_write_inode(struct inode *); 282void hpfs_write_inode_nolock(struct inode *); 283int hpfs_setattr(struct mnt_idmap *, struct dentry *, struct iattr *); 284void hpfs_write_if_changed(struct inode *); 285void hpfs_evict_inode(struct inode *); 286 287/* map.c */ 288 289__le32 *hpfs_map_dnode_bitmap(struct super_block *, struct quad_buffer_head *); 290__le32 *hpfs_map_bitmap(struct super_block *, unsigned, struct quad_buffer_head *, char *); 291void hpfs_prefetch_bitmap(struct super_block *, unsigned); 292unsigned char *hpfs_load_code_page(struct super_block *, secno); 293__le32 *hpfs_load_bitmap_directory(struct super_block *, secno bmp); 294void hpfs_load_hotfix_map(struct super_block *s, struct hpfs_spare_block *spareblock); 295struct fnode *hpfs_map_fnode(struct super_block *s, ino_t, struct buffer_head **); 296struct anode *hpfs_map_anode(struct super_block *s, anode_secno, struct buffer_head **); 297struct dnode *hpfs_map_dnode(struct super_block *s, dnode_secno, struct quad_buffer_head *); 298dnode_secno hpfs_fnode_dno(struct super_block *s, ino_t ino); 299 300/* name.c */ 301 302unsigned char hpfs_upcase(unsigned char *, unsigned char); 303int hpfs_chk_name(const unsigned char *, unsigned *); 304unsigned char *hpfs_translate_name(struct super_block *, unsigned char *, unsigned, int, int); 305int hpfs_compare_names(struct super_block *, const unsigned char *, unsigned, 306 const unsigned char *, unsigned, int); 307int hpfs_is_name_long(const unsigned char *, unsigned); 308void hpfs_adjust_length(const unsigned char *, unsigned *); 309 310/* namei.c */ 311 312extern const struct inode_operations hpfs_dir_iops; 313extern const struct address_space_operations hpfs_symlink_aops; 314 315static inline struct hpfs_inode_info *hpfs_i(struct inode *inode) 316{ 317 return container_of(inode, struct hpfs_inode_info, vfs_inode); 318} 319 320static inline struct hpfs_sb_info *hpfs_sb(struct super_block *sb) 321{ 322 return sb->s_fs_info; 323} 324 325/* super.c */ 326 327__printf(2, 3) 328void hpfs_error(struct super_block *, const char *, ...); 329int hpfs_stop_cycles(struct super_block *, int, int *, int *, char *); 330unsigned hpfs_get_free_dnodes(struct super_block *); 331long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg); 332 333/* 334 * local time (HPFS) to GMT (Unix) 335 */ 336 337static inline time64_t local_to_gmt(struct super_block *s, time64_t t) 338{ 339 extern struct timezone sys_tz; 340 return t + sys_tz.tz_minuteswest * 60 + hpfs_sb(s)->sb_timeshift; 341} 342 343static inline time32_t gmt_to_local(struct super_block *s, time64_t t) 344{ 345 extern struct timezone sys_tz; 346 return t - sys_tz.tz_minuteswest * 60 - hpfs_sb(s)->sb_timeshift; 347} 348 349static inline time32_t local_get_seconds(struct super_block *s) 350{ 351 return gmt_to_local(s, ktime_get_real_seconds()); 352} 353 354/* 355 * Locking: 356 * 357 * hpfs_lock() locks the whole filesystem. It must be taken 358 * on any method called by the VFS. 359 * 360 * We don't do any per-file locking anymore, it is hard to 361 * review and HPFS is not performance-sensitive anyway. 362 */ 363static inline void hpfs_lock(struct super_block *s) 364{ 365 struct hpfs_sb_info *sbi = hpfs_sb(s); 366 mutex_lock(&sbi->hpfs_mutex); 367} 368 369static inline void hpfs_unlock(struct super_block *s) 370{ 371 struct hpfs_sb_info *sbi = hpfs_sb(s); 372 mutex_unlock(&sbi->hpfs_mutex); 373} 374 375static inline void hpfs_lock_assert(struct super_block *s) 376{ 377 struct hpfs_sb_info *sbi = hpfs_sb(s); 378 WARN_ON(!mutex_is_locked(&sbi->hpfs_mutex)); 379} 380