1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifdef pr_fmt 3 #undef pr_fmt 4 #endif 5 6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 7 8 #include <linux/types.h> 9 #include <linux/fs.h> 10 #include <linux/buffer_head.h> 11 #include "amigaffs.h" 12 #include <linux/mutex.h> 13 #include <linux/workqueue.h> 14 15 /* Ugly macros make the code more pretty. */ 16 17 #define GET_END_PTR(st,p,sz) ((st *)((char *)(p)+((sz)-sizeof(st)))) 18 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey]) 19 #define AFFS_BLOCK(sb, bh, blk) (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)]) 20 21 #define AFFS_HEAD(bh) ((struct affs_head *)(bh)->b_data) 22 #define AFFS_TAIL(sb, bh) ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail))) 23 #define AFFS_ROOT_HEAD(bh) ((struct affs_root_head *)(bh)->b_data) 24 #define AFFS_ROOT_TAIL(sb, bh) ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail))) 25 #define AFFS_DATA_HEAD(bh) ((struct affs_data_head *)(bh)->b_data) 26 #define AFFS_DATA(bh) (((struct affs_data_head *)(bh)->b_data)->data) 27 28 #define AFFS_CACHE_SIZE PAGE_SIZE 29 30 #define AFFS_LC_SIZE (AFFS_CACHE_SIZE/sizeof(u32)/2) 31 #define AFFS_AC_SIZE (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2) 32 #define AFFS_AC_MASK (AFFS_AC_SIZE-1) 33 34 #define AFFSNAMEMAX 30U 35 36 struct affs_ext_key { 37 u32 ext; /* idx of the extended block */ 38 u32 key; /* block number */ 39 }; 40 41 /* 42 * affs fs inode data in memory 43 */ 44 struct affs_inode_info { 45 atomic_t i_opencnt; 46 struct mutex i_link_lock; /* Protects internal inode access. */ 47 struct mutex i_ext_lock; /* Protects internal inode access. */ 48 #define i_hash_lock i_ext_lock 49 u32 i_blkcnt; /* block count */ 50 u32 i_extcnt; /* extended block count */ 51 u32 *i_lc; /* linear cache of extended blocks */ 52 u32 i_lc_size; 53 u32 i_lc_shift; 54 u32 i_lc_mask; 55 struct affs_ext_key *i_ac; /* associative cache of extended blocks */ 56 u32 i_ext_last; /* last accessed extended block */ 57 struct buffer_head *i_ext_bh; /* bh of last extended block */ 58 loff_t mmu_private; 59 u32 i_protect; /* unused attribute bits */ 60 u32 i_lastalloc; /* last allocated block */ 61 int i_pa_cnt; /* number of preallocated blocks */ 62 struct inode vfs_inode; 63 }; 64 65 /* short cut to get to the affs specific inode data */ 66 static inline struct affs_inode_info *AFFS_I(struct inode *inode) 67 { 68 return container_of(inode, struct affs_inode_info, vfs_inode); 69 } 70 71 /* 72 * super-block data in memory 73 * 74 * Block numbers are adjusted for their actual size 75 * 76 */ 77 78 struct affs_bm_info { 79 u32 bm_key; /* Disk block number */ 80 u32 bm_free; /* Free blocks in here */ 81 }; 82 83 struct affs_sb_info { 84 int s_partition_size; /* Partition size in blocks. */ 85 int s_reserved; /* Number of reserved blocks. */ 86 //u32 s_blksize; /* Initial device blksize */ 87 u32 s_data_blksize; /* size of the data block w/o header */ 88 u32 s_root_block; /* FFS root block number. */ 89 int s_hashsize; /* Size of hash table. */ 90 unsigned long s_flags; /* See below. */ 91 kuid_t s_uid; /* uid to override */ 92 kgid_t s_gid; /* gid to override */ 93 umode_t s_mode; /* mode to override */ 94 struct buffer_head *s_root_bh; /* Cached root block. */ 95 struct mutex s_bmlock; /* Protects bitmap access. */ 96 struct affs_bm_info *s_bitmap; /* Bitmap infos. */ 97 u32 s_bmap_count; /* # of bitmap blocks. */ 98 u32 s_bmap_bits; /* # of bits in one bitmap blocks */ 99 u32 s_last_bmap; 100 struct buffer_head *s_bmap_bh; 101 char *s_prefix; /* Prefix for volumes and assigns. */ 102 char s_volume[32]; /* Volume prefix for absolute symlinks. */ 103 spinlock_t symlink_lock; /* protects the previous two */ 104 struct super_block *sb; /* the VFS superblock object */ 105 int work_queued; /* non-zero delayed work is queued */ 106 struct delayed_work sb_work; /* superblock flush delayed work */ 107 spinlock_t work_lock; /* protects sb_work and work_queued */ 108 struct rcu_head rcu; 109 }; 110 111 #define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */ 112 #define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */ 113 #define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ 114 #define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */ 115 #define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */ 116 #define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */ 117 #define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ 118 #define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ 119 #define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */ 120 #define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ 121 #define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */ 122 #define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */ 123 124 #define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt) 125 #define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt) 126 #define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt) 127 128 /* short cut to get to the affs specific sb data */ 129 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) 130 { 131 return sb->s_fs_info; 132 } 133 134 void affs_mark_sb_dirty(struct super_block *sb); 135 136 /* amigaffs.c */ 137 138 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); 139 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); 140 extern int affs_remove_header(struct dentry *dentry); 141 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); 142 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); 143 extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds); 144 extern umode_t affs_prot_to_mode(u32 prot); 145 extern void affs_mode_to_prot(struct inode *inode); 146 __printf(3, 4) 147 extern void affs_error(struct super_block *sb, const char *function, 148 const char *fmt, ...); 149 __printf(3, 4) 150 extern void affs_warning(struct super_block *sb, const char *function, 151 const char *fmt, ...); 152 extern bool affs_nofilenametruncate(const struct dentry *dentry); 153 extern int affs_check_name(const unsigned char *name, int len, 154 bool notruncate); 155 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); 156 157 /* bitmap. c */ 158 159 extern u32 affs_count_free_blocks(struct super_block *s); 160 extern void affs_free_block(struct super_block *sb, u32 block); 161 extern u32 affs_alloc_block(struct inode *inode, u32 goal); 162 extern int affs_init_bitmap(struct super_block *sb, int *flags); 163 extern void affs_free_bitmap(struct super_block *sb); 164 165 /* namei.c */ 166 167 extern const struct export_operations affs_export_ops; 168 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); 169 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int); 170 extern int affs_unlink(struct inode *dir, struct dentry *dentry); 171 extern int affs_create(struct mnt_idmap *idmap, struct inode *dir, 172 struct dentry *dentry, umode_t mode, bool); 173 extern int affs_mkdir(struct mnt_idmap *idmap, struct inode *dir, 174 struct dentry *dentry, umode_t mode); 175 extern int affs_rmdir(struct inode *dir, struct dentry *dentry); 176 extern int affs_link(struct dentry *olddentry, struct inode *dir, 177 struct dentry *dentry); 178 extern int affs_symlink(struct mnt_idmap *idmap, 179 struct inode *dir, struct dentry *dentry, 180 const char *symname); 181 extern int affs_rename2(struct mnt_idmap *idmap, 182 struct inode *old_dir, struct dentry *old_dentry, 183 struct inode *new_dir, struct dentry *new_dentry, 184 unsigned int flags); 185 186 /* inode.c */ 187 188 extern struct inode *affs_new_inode(struct inode *dir); 189 extern int affs_notify_change(struct mnt_idmap *idmap, 190 struct dentry *dentry, struct iattr *attr); 191 extern void affs_evict_inode(struct inode *inode); 192 extern struct inode *affs_iget(struct super_block *sb, 193 unsigned long ino); 194 extern int affs_write_inode(struct inode *inode, 195 struct writeback_control *wbc); 196 extern int affs_add_entry(struct inode *dir, struct inode *inode, 197 struct dentry *dentry, s32 type); 198 199 /* file.c */ 200 201 void affs_free_prealloc(struct inode *inode); 202 extern void affs_truncate(struct inode *); 203 int affs_file_fsync(struct file *, loff_t, loff_t, int); 204 205 /* dir.c */ 206 207 extern void affs_dir_truncate(struct inode *); 208 209 /* jump tables */ 210 211 extern const struct inode_operations affs_file_inode_operations; 212 extern const struct inode_operations affs_dir_inode_operations; 213 extern const struct inode_operations affs_symlink_inode_operations; 214 extern const struct file_operations affs_file_operations; 215 extern const struct file_operations affs_file_operations_ofs; 216 extern const struct file_operations affs_dir_operations; 217 extern const struct address_space_operations affs_symlink_aops; 218 extern const struct address_space_operations affs_aops; 219 extern const struct address_space_operations affs_aops_ofs; 220 221 extern const struct dentry_operations affs_dentry_operations; 222 extern const struct dentry_operations affs_intl_dentry_operations; 223 224 static inline bool affs_validblock(struct super_block *sb, int block) 225 { 226 return(block >= AFFS_SB(sb)->s_reserved && 227 block < AFFS_SB(sb)->s_partition_size); 228 } 229 230 static inline void 231 affs_set_blocksize(struct super_block *sb, int size) 232 { 233 sb_set_blocksize(sb, size); 234 } 235 static inline struct buffer_head * 236 affs_bread(struct super_block *sb, int block) 237 { 238 pr_debug("%s: %d\n", __func__, block); 239 if (affs_validblock(sb, block)) 240 return sb_bread(sb, block); 241 return NULL; 242 } 243 static inline struct buffer_head * 244 affs_getblk(struct super_block *sb, int block) 245 { 246 pr_debug("%s: %d\n", __func__, block); 247 if (affs_validblock(sb, block)) 248 return sb_getblk(sb, block); 249 return NULL; 250 } 251 static inline struct buffer_head * 252 affs_getzeroblk(struct super_block *sb, int block) 253 { 254 struct buffer_head *bh; 255 pr_debug("%s: %d\n", __func__, block); 256 if (affs_validblock(sb, block)) { 257 bh = sb_getblk(sb, block); 258 lock_buffer(bh); 259 memset(bh->b_data, 0 , sb->s_blocksize); 260 set_buffer_uptodate(bh); 261 unlock_buffer(bh); 262 return bh; 263 } 264 return NULL; 265 } 266 static inline struct buffer_head * 267 affs_getemptyblk(struct super_block *sb, int block) 268 { 269 struct buffer_head *bh; 270 pr_debug("%s: %d\n", __func__, block); 271 if (affs_validblock(sb, block)) { 272 bh = sb_getblk(sb, block); 273 wait_on_buffer(bh); 274 set_buffer_uptodate(bh); 275 return bh; 276 } 277 return NULL; 278 } 279 static inline void 280 affs_brelse(struct buffer_head *bh) 281 { 282 if (bh) 283 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr); 284 brelse(bh); 285 } 286 287 static inline void 288 affs_adjust_checksum(struct buffer_head *bh, u32 val) 289 { 290 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); 291 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); 292 } 293 static inline void 294 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) 295 { 296 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); 297 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); 298 } 299 300 static inline void 301 affs_lock_link(struct inode *inode) 302 { 303 mutex_lock(&AFFS_I(inode)->i_link_lock); 304 } 305 static inline void 306 affs_unlock_link(struct inode *inode) 307 { 308 mutex_unlock(&AFFS_I(inode)->i_link_lock); 309 } 310 static inline void 311 affs_lock_dir(struct inode *inode) 312 { 313 mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING); 314 } 315 static inline void 316 affs_unlock_dir(struct inode *inode) 317 { 318 mutex_unlock(&AFFS_I(inode)->i_hash_lock); 319 } 320 static inline void 321 affs_lock_ext(struct inode *inode) 322 { 323 mutex_lock(&AFFS_I(inode)->i_ext_lock); 324 } 325 static inline void 326 affs_unlock_ext(struct inode *inode) 327 { 328 mutex_unlock(&AFFS_I(inode)->i_ext_lock); 329 } 330