LXR linux/fs/affs/affs.h

   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
  36struct 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 */
  44struct 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 */
  66static 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
  78struct affs_bm_info {
  79        u32 bm_key;                     /* Disk block number */
  80        u32 bm_free;                    /* Free blocks in here */
  81};
  82
  83struct 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 */
 128static inline struct affs_sb_info *AFFS_SB(struct super_block *sb)
 129{
 130        return sb->s_fs_info;
 131}
 132
 133void affs_mark_sb_dirty(struct super_block *sb);
 134
 135/* amigaffs.c */
 136
 137extern int      affs_insert_hash(struct inode *inode, struct buffer_head *bh);
 138extern int      affs_remove_hash(struct inode *dir, struct buffer_head *rem_bh);
 139extern int      affs_remove_header(struct dentry *dentry);
 140extern u32      affs_checksum_block(struct super_block *sb, struct buffer_head *bh);
 141extern void     affs_fix_checksum(struct super_block *sb, struct buffer_head *bh);
 142extern void     affs_secs_to_datestamp(time64_t secs, struct affs_date *ds);
 143extern umode_t  affs_prot_to_mode(u32 prot);
 144extern void     affs_mode_to_prot(struct inode *inode);
 145__printf(3, 4)
 146extern void     affs_error(struct super_block *sb, const char *function,
 147                           const char *fmt, ...);
 148__printf(3, 4)
 149extern void     affs_warning(struct super_block *sb, const char *function,
 150                             const char *fmt, ...);
 151extern bool     affs_nofilenametruncate(const struct dentry *dentry);
 152extern int      affs_check_name(const unsigned char *name, int len,
 153                                bool notruncate);
 154extern int      affs_copy_name(unsigned char *bstr, struct dentry *dentry);
 155
 156/* bitmap. c */
 157
 158extern u32      affs_count_free_blocks(struct super_block *s);
 159extern void     affs_free_block(struct super_block *sb, u32 block);
 160extern u32      affs_alloc_block(struct inode *inode, u32 goal);
 161extern int      affs_init_bitmap(struct super_block *sb, int *flags);
 162extern void     affs_free_bitmap(struct super_block *sb);
 163
 164/* namei.c */
 165
 166extern const struct export_operations affs_export_ops;
 167extern int      affs_hash_name(struct super_block *sb, const u8 *name, unsigned int len);
 168extern struct dentry *affs_lookup(struct inode *dir, struct dentry *dentry, unsigned int);
 169extern int      affs_unlink(struct inode *dir, struct dentry *dentry);
 170extern int      affs_create(struct user_namespace *mnt_userns, struct inode *dir,
 171                        struct dentry *dentry, umode_t mode, bool);
 172extern int      affs_mkdir(struct user_namespace *mnt_userns, struct inode *dir,
 173                        struct dentry *dentry, umode_t mode);
 174extern int      affs_rmdir(struct inode *dir, struct dentry *dentry);
 175extern int      affs_link(struct dentry *olddentry, struct inode *dir,
 176                          struct dentry *dentry);
 177extern int      affs_symlink(struct user_namespace *mnt_userns,
 178                        struct inode *dir, struct dentry *dentry,
 179                        const char *symname);
 180extern int      affs_rename2(struct user_namespace *mnt_userns,
 181                        struct inode *old_dir, struct dentry *old_dentry,
 182                        struct inode *new_dir, struct dentry *new_dentry,
 183                        unsigned int flags);
 184
 185/* inode.c */
 186
 187extern struct inode             *affs_new_inode(struct inode *dir);
 188extern int                       affs_notify_change(struct user_namespace *mnt_userns,
 189                                        struct dentry *dentry, struct iattr *attr);
 190extern void                      affs_evict_inode(struct inode *inode);
 191extern struct inode             *affs_iget(struct super_block *sb,
 192                                        unsigned long ino);
 193extern int                       affs_write_inode(struct inode *inode,
 194                                        struct writeback_control *wbc);
 195extern int                       affs_add_entry(struct inode *dir, struct inode *inode,
 196                                        struct dentry *dentry, s32 type);
 197
 198/* file.c */
 199
 200void            affs_free_prealloc(struct inode *inode);
 201extern void     affs_truncate(struct inode *);
 202int             affs_file_fsync(struct file *, loff_t, loff_t, int);
 203
 204/* dir.c */
 205
 206extern void   affs_dir_truncate(struct inode *);
 207
 208/* jump tables */
 209
 210extern const struct inode_operations     affs_file_inode_operations;
 211extern const struct inode_operations     affs_dir_inode_operations;
 212extern const struct inode_operations   affs_symlink_inode_operations;
 213extern const struct file_operations      affs_file_operations;
 214extern const struct file_operations      affs_file_operations_ofs;
 215extern const struct file_operations      affs_dir_operations;
 216extern const struct address_space_operations     affs_symlink_aops;
 217extern const struct address_space_operations     affs_aops;
 218extern const struct address_space_operations     affs_aops_ofs;
 219
 220extern const struct dentry_operations    affs_dentry_operations;
 221extern const struct dentry_operations    affs_intl_dentry_operations;
 222
 223static inline bool affs_validblock(struct super_block *sb, int block)
 224{
 225        return(block >= AFFS_SB(sb)->s_reserved &&
 226               block < AFFS_SB(sb)->s_partition_size);
 227}
 228
 229static inline void
 230affs_set_blocksize(struct super_block *sb, int size)
 231{
 232        sb_set_blocksize(sb, size);
 233}
 234static inline struct buffer_head *
 235affs_bread(struct super_block *sb, int block)
 236{
 237        pr_debug("%s: %d\n", __func__, block);
 238        if (affs_validblock(sb, block))
 239                return sb_bread(sb, block);
 240        return NULL;
 241}
 242static inline struct buffer_head *
 243affs_getblk(struct super_block *sb, int block)
 244{
 245        pr_debug("%s: %d\n", __func__, block);
 246        if (affs_validblock(sb, block))
 247                return sb_getblk(sb, block);
 248        return NULL;
 249}
 250static inline struct buffer_head *
 251affs_getzeroblk(struct super_block *sb, int block)
 252{
 253        struct buffer_head *bh;
 254        pr_debug("%s: %d\n", __func__, block);
 255        if (affs_validblock(sb, block)) {
 256                bh = sb_getblk(sb, block);
 257                lock_buffer(bh);
 258                memset(bh->b_data, 0 , sb->s_blocksize);
 259                set_buffer_uptodate(bh);
 260                unlock_buffer(bh);
 261                return bh;
 262        }
 263        return NULL;
 264}
 265static inline struct buffer_head *
 266affs_getemptyblk(struct super_block *sb, int block)
 267{
 268        struct buffer_head *bh;
 269        pr_debug("%s: %d\n", __func__, block);
 270        if (affs_validblock(sb, block)) {
 271                bh = sb_getblk(sb, block);
 272                wait_on_buffer(bh);
 273                set_buffer_uptodate(bh);
 274                return bh;
 275        }
 276        return NULL;
 277}
 278static inline void
 279affs_brelse(struct buffer_head *bh)
 280{
 281        if (bh)
 282                pr_debug("%s: %lld\n", __func__, (long long) bh->b_blocknr);
 283        brelse(bh);
 284}
 285
 286static inline void
 287affs_adjust_checksum(struct buffer_head *bh, u32 val)
 288{
 289        u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[5]);
 290        ((__be32 *)bh->b_data)[5] = cpu_to_be32(tmp - val);
 291}
 292static inline void
 293affs_adjust_bitmapchecksum(struct buffer_head *bh, u32 val)
 294{
 295        u32 tmp = be32_to_cpu(((__be32 *)bh->b_data)[0]);
 296        ((__be32 *)bh->b_data)[0] = cpu_to_be32(tmp - val);
 297}
 298
 299static inline void
 300affs_lock_link(struct inode *inode)
 301{
 302        mutex_lock(&AFFS_I(inode)->i_link_lock);
 303}
 304static inline void
 305affs_unlock_link(struct inode *inode)
 306{
 307        mutex_unlock(&AFFS_I(inode)->i_link_lock);
 308}
 309static inline void
 310affs_lock_dir(struct inode *inode)
 311{
 312        mutex_lock_nested(&AFFS_I(inode)->i_hash_lock, SINGLE_DEPTH_NESTING);
 313}
 314static inline void
 315affs_unlock_dir(struct inode *inode)
 316{
 317        mutex_unlock(&AFFS_I(inode)->i_hash_lock);
 318}
 319static inline void
 320affs_lock_ext(struct inode *inode)
 321{
 322        mutex_lock(&AFFS_I(inode)->i_ext_lock);
 323}
 324static inline void
 325affs_unlock_ext(struct inode *inode)
 326{
 327        mutex_unlock(&AFFS_I(inode)->i_ext_lock);
 328}
 329