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 }; 109 110 #define AFFS_MOUNT_SF_INTL 0x0001 /* International filesystem. */ 111 #define AFFS_MOUNT_SF_BM_VALID 0x0002 /* Bitmap is valid. */ 112 #define AFFS_MOUNT_SF_IMMUTABLE 0x0004 /* Protection bits cannot be changed */ 113 #define AFFS_MOUNT_SF_QUIET 0x0008 /* chmod errors will be not reported */ 114 #define AFFS_MOUNT_SF_SETUID 0x0010 /* Ignore Amiga uid */ 115 #define AFFS_MOUNT_SF_SETGID 0x0020 /* Ignore Amiga gid */ 116 #define AFFS_MOUNT_SF_SETMODE 0x0040 /* Ignore Amiga protection bits */ 117 #define AFFS_MOUNT_SF_MUFS 0x0100 /* Use MUFS uid/gid mapping */ 118 #define AFFS_MOUNT_SF_OFS 0x0200 /* Old filesystem */ 119 #define AFFS_MOUNT_SF_PREFIX 0x0400 /* Buffer for prefix is allocated */ 120 #define AFFS_MOUNT_SF_VERBOSE 0x0800 /* Talk about fs when mounting */ 121 #define AFFS_MOUNT_SF_NO_TRUNCATE 0x1000 /* Don't truncate filenames */ 122 123 #define affs_clear_opt(o, opt) (o &= ~AFFS_MOUNT_##opt) 124 #define affs_set_opt(o, opt) (o |= AFFS_MOUNT_##opt) 125 #define affs_test_opt(o, opt) ((o) & AFFS_MOUNT_##opt) 126 127 /* short cut to get to the affs specific sb data */ 128 static inline struct affs_sb_info *AFFS_SB(struct super_block *sb) 129 { 130 return sb->s_fs_info; 131 } 132 133 void affs_mark_sb_dirty(struct super_block *sb); 134 135 /* amigaffs.c */ 136 137 extern int affs_insert_hash(struct inode *inode, struct buffer_head *bh); 138 extern int affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh); 139 extern int affs_remove_header(struct dentry *dentry); 140 extern u32 affs_checksum_block(struct super_block *sb, struct buffer_head *bh); 141 extern void affs_fix_checksum(struct super_block *sb, struct buffer_head *bh); 142 extern void affs_secs_to_datestamp(time64_t secs, struct affs_date *ds); 143 extern umode_t affs_prot_to_mode(u32 prot); 144 extern void affs_mode_to_prot(struct inode *inode); 145 __printf(3, 4) 146 extern void affs_error(struct super_block *sb, const char *function, 147 const char *fmt, ...); 148 __printf(3, 4) 149 extern void affs_warning(struct super_block *sb, const char *function, 150 const char *fmt, ...); 151 extern bool affs_nofilenametruncate(const struct dentry *dentry); 152 extern int affs_check_name(const unsigned char *name, int len, 153 bool notruncate); 154 extern int affs_copy_name(unsigned char *bstr, struct dentry *dentry); 155 156 /* bitmap. c */ 157 158 extern u32 affs_count_free_blocks(struct super_block *s); 159 extern void affs_free_block(struct super_block *sb, u32 block); 160 extern u32 affs_alloc_block(struct inode *inode, u32 goal); 161 extern int affs_init_bitmap(struct super_block *sb, int *flags); 162 extern void affs_free_bitmap(struct super_block *sb); 163 164 /* namei.c */ 165 166 extern const struct export_operations affs_export_ops; 167 extern int affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len); 168 extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int); 169 extern int affs_unlink(struct inode *dir, struct dentry *dentry); 170 extern int affs_create(struct inode *dir, struct dentry *dentry, umode_t mode, bool); 171 extern int affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); 172 extern int affs_rmdir(struct inode *dir, struct dentry *dentry); 173 extern int affs_link(struct dentry *olddentry, struct inode *dir, 174 struct dentry *dentry); 175 extern int affs_symlink(struct inode *dir, struct dentry *dentry, 176 const char *symname); 177 extern int affs_rename2(struct inode *old_dir, struct dentry *old_dentry, 178 struct inode *new_dir, struct dentry *new_dentry, 179 unsigned int flags); 180 181 /* inode.c */ 182 183 extern struct inode *affs_new_inode(struct inode *dir); 184 extern int affs_notify_change(struct dentry *dentry, struct iattr *attr); 185 extern void affs_evict_inode(struct inode *inode); 186 extern struct inode *affs_iget(struct super_block *sb, 187 unsigned long ino); 188 extern int affs_write_inode(struct inode *inode, 189 struct writeback_control *wbc); 190 extern int affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type); 191 192 /* file.c */ 193 194 void affs_free_prealloc(struct inode *inode); 195 extern void affs_truncate(struct inode *); 196 int affs_file_fsync(struct file *, loff_t, loff_t, int); 197 198 /* dir.c */ 199 200 extern void affs_dir_truncate(struct inode *); 201 202 /* jump tables */ 203 204 extern const struct inode_operations affs_file_inode_operations; 205 extern const struct inode_operations affs_dir_inode_operations; 206 extern const struct inode_operations affs_symlink_inode_operations; 207 extern const struct file_operations affs_file_operations; 208 extern const struct file_operations affs_file_operations_ofs; 209 extern const struct file_operations affs_dir_operations; 210 extern const struct address_space_operations affs_symlink_aops; 211 extern const struct address_space_operations affs_aops; 212 extern const struct address_space_operations affs_aops_ofs; 213 214 extern const struct dentry_operations affs_dentry_operations; 215 extern const struct dentry_operations affs_intl_dentry_operations; 216 217 static inline bool affs_validblock(struct super_block *sb, int block) 218 { 219 return(block >= AFFS_SB(sb)->s_reserved && 220 block < AFFS_SB(sb)->s_partition_size); 221 } 222 223 static inline void 224 affs_set_blocksize(struct super_block *sb, int size) 225 { 226 sb_set_blocksize(sb, size); 227 } 228 static inline struct buffer_head * 229 affs_bread(struct super_block *sb, int block) 230 { 231 pr_debug("%s: %d\n", __func__, block); 232 if (affs_validblock(sb, block)) 233 return sb_bread(sb, block); 234 return NULL; 235 } 236 static inline struct buffer_head * 237 affs_getblk(struct super_block *sb, int block) 238 { 239 pr_debug("%s: %d\n", __func__, block); 240 if (affs_validblock(sb, block)) 241 return sb_getblk(sb, block); 242 return NULL; 243 } 244 static inline struct buffer_head * 245 affs_getzeroblk(struct super_block *sb, int block) 246 { 247 struct buffer_head *bh; 248 pr_debug("%s: %d\n", __func__, block); 249 if (affs_validblock(sb, block)) { 250 bh = sb_getblk(sb, block); 251 lock_buffer(bh); 252 memset(bh->b_data, 0 , sb->s_blocksize); 253 set_buffer_uptodate(bh); 254 unlock_buffer(bh); 255 return bh; 256 } 257 return NULL; 258 } 259 static inline struct buffer_head * 260 affs_getemptyblk(struct super_block *sb, int block) 261 { 262 struct buffer_head *bh; 263 pr_debug("%s: %d\n", __func__, block); 264 if (affs_validblock(sb, block)) { 265 bh = sb_getblk(sb, block); 266 wait_on_buffer(bh); 267 set_buffer_uptodate(bh); 268 return bh; 269 } 270 return NULL; 271 } 272 static inline void 273 affs_brelse(struct buffer_head *bh) 274 { 275 if (bh) 276 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr); 277 brelse(bh); 278 } 279 280 static inline void 281 affs_adjust_checksum(struct buffer_head *bh, u32 val) 282 { 283 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]); 284 ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val); 285 } 286 static inline void 287 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val) 288 { 289 u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]); 290 ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val); 291 } 292 293 static inline void 294 affs_lock_link(struct inode *inode) 295 { 296 mutex_lock(&AFFS_I(inode)->i_link_lock); 297 } 298 static inline void 299 affs_unlock_link(struct inode *inode) 300 { 301 mutex_unlock(&AFFS_I(inode)->i_link_lock); 302 } 303 static inline void 304 affs_lock_dir(struct inode *inode) 305 { 306 mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING); 307 } 308 static inline void 309 affs_unlock_dir(struct inode *inode) 310 { 311 mutex_unlock(&AFFS_I(inode)->i_hash_lock); 312 } 313 static inline void 314 affs_lock_ext(struct inode *inode) 315 { 316 mutex_lock(&AFFS_I(inode)->i_ext_lock); 317 } 318 static inline void 319 affs_unlock_ext(struct inode *inode) 320 { 321 mutex_unlock(&AFFS_I(inode)->i_ext_lock); 322 } 323