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