fs/affs/affs.h

   1 #ifdef pr_fmt
   2 #undef pr_fmt
   3 #endif
   4
   5 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   6
   7 #include <linux/types.h>
   8 #include <linux/fs.h>
   9 #include <linux/buffer_head.h>
  10 #include "amigaffs.h"
  11 #include <linux/mutex.h>
  12 #include <linux/workqueue.h>
  13
  14 /* Ugly macros make the code more pretty. */
  15
  16 #define GET_END_PTR(st,p,sz)             ((st *)((char *)(p)+((sz)-sizeof(st))))
  17 #define AFFS_GET_HASHENTRY(data,hashkey) be32_to_cpu(((struct dir_front *)data)->hashtable[hashkey])
  18 #define AFFS_BLOCK(sb, bh, blk)         (AFFS_HEAD(bh)->table[AFFS_SB(sb)->s_hashsize-1-(blk)])
  19
  20 #define AFFS_HEAD(bh)           ((struct affs_head *)(bh)->b_data)
  21 #define AFFS_TAIL(sb, bh)       ((struct affs_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_tail)))
  22 #define AFFS_ROOT_HEAD(bh)      ((struct affs_root_head *)(bh)->b_data)
  23 #define AFFS_ROOT_TAIL(sb, bh)  ((struct affs_root_tail *)((bh)->b_data+(sb)->s_blocksize-sizeof(struct affs_root_tail)))
  24 #define AFFS_DATA_HEAD(bh)      ((struct affs_data_head *)(bh)->b_data)
  25 #define AFFS_DATA(bh)           (((struct affs_data_head *)(bh)->b_data)->data)
  26
  27 #define AFFS_CACHE_SIZE         PAGE_SIZE
  28
  29 #define AFFS_LC_SIZE            (AFFS_CACHE_SIZE/sizeof(u32)/2)
  30 #define AFFS_AC_SIZE            (AFFS_CACHE_SIZE/sizeof(struct affs_ext_key)/2)
  31 #define AFFS_AC_MASK            (AFFS_AC_SIZE-1)
  32
  33 #define AFFSNAMEMAX 30U
  34
  35 struct affs_ext_key {
  36         u32     ext;                            /* idx of the extended block */
  37         u32     key;                            /* block number */
  38 };
  39
  40 /*
  41  * affs fs inode data in memory
  42  */
  43 struct affs_inode_info {
  44         atomic_t i_opencnt;
  45         struct semaphore i_link_lock;           /* Protects internal inode access. */
  46         struct semaphore i_ext_lock;            /* Protects internal inode access. */
  47 #define i_hash_lock i_ext_lock
  48         u32      i_blkcnt;                      /* block count */
  49         u32      i_extcnt;                      /* extended block count */
  50         u32     *i_lc;                          /* linear cache of extended blocks */
  51         u32      i_lc_size;
  52         u32      i_lc_shift;
  53         u32      i_lc_mask;
  54         struct affs_ext_key *i_ac;              /* associative cache of extended blocks */
  55         u32      i_ext_last;                    /* last accessed extended block */
  56         struct buffer_head *i_ext_bh;           /* bh of last extended block */
  57         loff_t   mmu_private;
  58         u32      i_protect;                     /* unused attribute bits */
  59         u32      i_lastalloc;                   /* last allocated block */
  60         int      i_pa_cnt;                      /* number of preallocated blocks */
  61         struct inode vfs_inode;
  62 };
  63
  64 /* short cut to get to the affs specific inode data */
  65 static inline struct affs_inode_info *AFFS_I(struct inode *inode)
  66 {
  67         return container_of(inode, struct affs_inode_info, vfs_inode);
  68 }
  69
  70 /*
  71  * super-block data in memory
  72  *
  73  * Block numbers are adjusted for their actual size
  74  *
  75  */
  76
  77 struct affs_bm_info {
  78         u32 bm_key;                     /* Disk block number */
  79         u32 bm_free;                    /* Free blocks in here */
  80 };
  81
  82 struct affs_sb_info {
  83         int s_partition_size;           /* Partition size in blocks. */
  84         int s_reserved;                 /* Number of reserved blocks. */
  85         //u32 s_blksize;                        /* Initial device blksize */
  86         u32 s_data_blksize;             /* size of the data block w/o header */
  87         u32 s_root_block;               /* FFS root block number. */
  88         int s_hashsize;                 /* Size of hash table. */
  89         unsigned long s_flags;          /* See below. */
  90         kuid_t s_uid;                   /* uid to override */
  91         kgid_t s_gid;                   /* gid to override */
  92         umode_t s_mode;                 /* mode to override */
  93         struct buffer_head *s_root_bh;  /* Cached root block. */
  94         struct mutex s_bmlock;          /* Protects bitmap access. */
  95         struct affs_bm_info *s_bitmap;  /* Bitmap infos. */
  96         u32 s_bmap_count;               /* # of bitmap blocks. */
  97         u32 s_bmap_bits;                /* # of bits in one bitmap blocks */
  98         u32 s_last_bmap;
  99         struct buffer_head *s_bmap_bh;
 100         char *s_prefix;                 /* Prefix for volumes and assigns. */
 101         char s_volume[32];              /* Volume prefix for absolute symlinks. */
 102         spinlock_t symlink_lock;        /* protects the previous two */
 103         struct super_block *sb;         /* the VFS superblock object */
 104         int work_queued;                /* non-zero delayed work is queued */
 105         struct delayed_work sb_work;    /* superblock flush delayed work */
 106         spinlock_t work_lock;           /* protects sb_work and work_queued */
 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 inode *dir, struct dentry *dentry, umode_t mode, bool);
 170 extern int      affs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode);
 171 extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 172 extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 173                           struct dentry *dentry);
 174 extern int      affs_symlink(struct inode *dir, struct dentry *dentry,
 175                              const char *symname);
 176 extern int      affs_rename2(struct inode *old_dir, struct dentry *old_dentry,
 177                             struct inode *new_dir, struct dentry *new_dentry,
 178                             unsigned int flags);
 179
 180 /* inode.c */
 181
 182 extern struct inode             *affs_new_inode(struct inode *dir);
 183 extern int                       affs_notify_change(struct dentry *dentry, struct iattr *attr);
 184 extern void                      affs_evict_inode(struct inode *inode);
 185 extern struct inode             *affs_iget(struct super_block *sb,
 186                                         unsigned long ino);
 187 extern int                       affs_write_inode(struct inode *inode,
 188                                         struct writeback_control *wbc);
 189 extern int                       affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type);
 190
 191 /* file.c */
 192
 193 void            affs_free_prealloc(struct inode *inode);
 194 extern void     affs_truncate(struct inode *);
 195 int             affs_file_fsync(struct file *, loff_t, loff_t, int);
 196
 197 /* dir.c */
 198
 199 extern void   affs_dir_truncate(struct inode *);
 200
 201 /* jump tables */
 202
 203 extern const struct inode_operations     affs_file_inode_operations;
 204 extern const struct inode_operations     affs_dir_inode_operations;
 205 extern const struct inode_operations   affs_symlink_inode_operations;
 206 extern const struct file_operations      affs_file_operations;
 207 extern const struct file_operations      affs_file_operations_ofs;
 208 extern const struct file_operations      affs_dir_operations;
 209 extern const struct address_space_operations     affs_symlink_aops;
 210 extern const struct address_space_operations     affs_aops;
 211 extern const struct address_space_operations     affs_aops_ofs;
 212
 213 extern const struct dentry_operations    affs_dentry_operations;
 214 extern const struct dentry_operations    affs_intl_dentry_operations;
 215
 216 static inline bool affs_validblock(struct super_block *sb, int block)
 217 {
 218         return(block >= AFFS_SB(sb)->s_reserved &&
 219                block < AFFS_SB(sb)->s_partition_size);
 220 }
 221
 222 static inline void
 223 affs_set_blocksize(struct super_block *sb, int size)
 224 {
 225         sb_set_blocksize(sb, size);
 226 }
 227 static inline struct buffer_head *
 228 affs_bread(struct super_block *sb, int block)
 229 {
 230         pr_debug("%s: %d\n", __func__, block);
 231         if (affs_validblock(sb, block))
 232                 return sb_bread(sb, block);
 233         return NULL;
 234 }
 235 static inline struct buffer_head *
 236 affs_getblk(struct super_block *sb, int block)
 237 {
 238         pr_debug("%s: %d\n", __func__, block);
 239         if (affs_validblock(sb, block))
 240                 return sb_getblk(sb, block);
 241         return NULL;
 242 }
 243 static inline struct buffer_head *
 244 affs_getzeroblk(struct super_block *sb, int block)
 245 {
 246         struct buffer_head *bh;
 247         pr_debug("%s: %d\n", __func__, block);
 248         if (affs_validblock(sb, block)) {
 249                 bh = sb_getblk(sb, block);
 250                 lock_buffer(bh);
 251                 memset(bh->b_data, 0 , sb->s_blocksize);
 252                 set_buffer_uptodate(bh);
 253                 unlock_buffer(bh);
 254                 return bh;
 255         }
 256         return NULL;
 257 }
 258 static inline struct buffer_head *
 259 affs_getemptyblk(struct super_block *sb, int block)
 260 {
 261         struct buffer_head *bh;
 262         pr_debug("%s: %d\n", __func__, block);
 263         if (affs_validblock(sb, block)) {
 264                 bh = sb_getblk(sb, block);
 265                 wait_on_buffer(bh);
 266                 set_buffer_uptodate(bh);
 267                 return bh;
 268         }
 269         return NULL;
 270 }
 271 static inline void
 272 affs_brelse(struct buffer_head *bh)
 273 {
 274         if (bh)
 275                 pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
 276         brelse(bh);
 277 }
 278
 279 static inline void
 280 affs_adjust_checksum(struct buffer_head *bh, u32 val)
 281 {
 282         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 283         ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 284 }
 285 static inline void
 286 affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 287 {
 288         u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 289         ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 290 }
 291
 292 static inline void
 293 affs_lock_link(struct inode *inode)
 294 {
 295         down(&AFFS_I(inode)->i_link_lock);
 296 }
 297 static inline void
 298 affs_unlock_link(struct inode *inode)
 299 {
 300         up(&AFFS_I(inode)->i_link_lock);
 301 }
 302 static inline void
 303 affs_lock_dir(struct inode *inode)
 304 {
 305         down(&AFFS_I(inode)->i_hash_lock);
 306 }
 307 static inline void
 308 affs_unlock_dir(struct inode *inode)
 309 {
 310         up(&AFFS_I(inode)->i_hash_lock);
 311 }
 312 static inline void
 313 affs_lock_ext(struct inode *inode)
 314 {
 315         down(&AFFS_I(inode)->i_ext_lock);
 316 }
 317 static inline void
 318 affs_unlock_ext(struct inode *inode)
 319 {
 320         up(&AFFS_I(inode)->i_ext_lock);
 321 }