linux/fs/affs/inode.c
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   1/*
   2 *  linux/fs/affs/inode.c
   3 *
   4 *  (c) 1996  Hans-Joachim Widmaier - Rewritten
   5 *
   6 *  (C) 1993  Ray Burr - Modified for Amiga FFS filesystem.
   7 *
   8 *  (C) 1992  Eric Youngdale Modified for ISO9660 filesystem.
   9 *
  10 *  (C) 1991  Linus Torvalds - minix filesystem
  11 */
  12#include <linux/sched.h>
  13#include <linux/gfp.h>
  14#include "affs.h"
  15
  16extern const struct inode_operations affs_symlink_inode_operations;
  17extern struct timezone sys_tz;
  18
  19struct inode *affs_iget(struct super_block *sb, unsigned long ino)
  20{
  21        struct affs_sb_info     *sbi = AFFS_SB(sb);
  22        struct buffer_head      *bh;
  23        struct affs_head        *head;
  24        struct affs_tail        *tail;
  25        struct inode            *inode;
  26        u32                      block;
  27        u32                      size;
  28        u32                      prot;
  29        u16                      id;
  30
  31        inode = iget_locked(sb, ino);
  32        if (!inode)
  33                return ERR_PTR(-ENOMEM);
  34        if (!(inode->i_state & I_NEW))
  35                return inode;
  36
  37        pr_debug("AFFS: affs_iget(%lu)\n", inode->i_ino);
  38
  39        block = inode->i_ino;
  40        bh = affs_bread(sb, block);
  41        if (!bh) {
  42                affs_warning(sb, "read_inode", "Cannot read block %d", block);
  43                goto bad_inode;
  44        }
  45        if (affs_checksum_block(sb, bh) || be32_to_cpu(AFFS_HEAD(bh)->ptype) != T_SHORT) {
  46                affs_warning(sb,"read_inode",
  47                           "Checksum or type (ptype=%d) error on inode %d",
  48                           AFFS_HEAD(bh)->ptype, block);
  49                goto bad_inode;
  50        }
  51
  52        head = AFFS_HEAD(bh);
  53        tail = AFFS_TAIL(sb, bh);
  54        prot = be32_to_cpu(tail->protect);
  55
  56        inode->i_size = 0;
  57        set_nlink(inode, 1);
  58        inode->i_mode = 0;
  59        AFFS_I(inode)->i_extcnt = 1;
  60        AFFS_I(inode)->i_ext_last = ~1;
  61        AFFS_I(inode)->i_protect = prot;
  62        atomic_set(&AFFS_I(inode)->i_opencnt, 0);
  63        AFFS_I(inode)->i_blkcnt = 0;
  64        AFFS_I(inode)->i_lc = NULL;
  65        AFFS_I(inode)->i_lc_size = 0;
  66        AFFS_I(inode)->i_lc_shift = 0;
  67        AFFS_I(inode)->i_lc_mask = 0;
  68        AFFS_I(inode)->i_ac = NULL;
  69        AFFS_I(inode)->i_ext_bh = NULL;
  70        AFFS_I(inode)->mmu_private = 0;
  71        AFFS_I(inode)->i_lastalloc = 0;
  72        AFFS_I(inode)->i_pa_cnt = 0;
  73
  74        if (sbi->s_flags & SF_SETMODE)
  75                inode->i_mode = sbi->s_mode;
  76        else
  77                inode->i_mode = prot_to_mode(prot);
  78
  79        id = be16_to_cpu(tail->uid);
  80        if (id == 0 || sbi->s_flags & SF_SETUID)
  81                inode->i_uid = sbi->s_uid;
  82        else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  83                inode->i_uid = 0;
  84        else
  85                inode->i_uid = id;
  86
  87        id = be16_to_cpu(tail->gid);
  88        if (id == 0 || sbi->s_flags & SF_SETGID)
  89                inode->i_gid = sbi->s_gid;
  90        else if (id == 0xFFFF && sbi->s_flags & SF_MUFS)
  91                inode->i_gid = 0;
  92        else
  93                inode->i_gid = id;
  94
  95        switch (be32_to_cpu(tail->stype)) {
  96        case ST_ROOT:
  97                inode->i_uid = sbi->s_uid;
  98                inode->i_gid = sbi->s_gid;
  99                /* fall through */
 100        case ST_USERDIR:
 101                if (be32_to_cpu(tail->stype) == ST_USERDIR ||
 102                    sbi->s_flags & SF_SETMODE) {
 103                        if (inode->i_mode & S_IRUSR)
 104                                inode->i_mode |= S_IXUSR;
 105                        if (inode->i_mode & S_IRGRP)
 106                                inode->i_mode |= S_IXGRP;
 107                        if (inode->i_mode & S_IROTH)
 108                                inode->i_mode |= S_IXOTH;
 109                        inode->i_mode |= S_IFDIR;
 110                } else
 111                        inode->i_mode = S_IRUGO | S_IXUGO | S_IWUSR | S_IFDIR;
 112                /* Maybe it should be controlled by mount parameter? */
 113                //inode->i_mode |= S_ISVTX;
 114                inode->i_op = &affs_dir_inode_operations;
 115                inode->i_fop = &affs_dir_operations;
 116                break;
 117        case ST_LINKDIR:
 118#if 0
 119                affs_warning(sb, "read_inode", "inode is LINKDIR");
 120                goto bad_inode;
 121#else
 122                inode->i_mode |= S_IFDIR;
 123                /* ... and leave ->i_op and ->i_fop pointing to empty */
 124                break;
 125#endif
 126        case ST_LINKFILE:
 127                affs_warning(sb, "read_inode", "inode is LINKFILE");
 128                goto bad_inode;
 129        case ST_FILE:
 130                size = be32_to_cpu(tail->size);
 131                inode->i_mode |= S_IFREG;
 132                AFFS_I(inode)->mmu_private = inode->i_size = size;
 133                if (inode->i_size) {
 134                        AFFS_I(inode)->i_blkcnt = (size - 1) /
 135                                               sbi->s_data_blksize + 1;
 136                        AFFS_I(inode)->i_extcnt = (AFFS_I(inode)->i_blkcnt - 1) /
 137                                               sbi->s_hashsize + 1;
 138                }
 139                if (tail->link_chain)
 140                        set_nlink(inode, 2);
 141                inode->i_mapping->a_ops = (sbi->s_flags & SF_OFS) ? &affs_aops_ofs : &affs_aops;
 142                inode->i_op = &affs_file_inode_operations;
 143                inode->i_fop = &affs_file_operations;
 144                break;
 145        case ST_SOFTLINK:
 146                inode->i_mode |= S_IFLNK;
 147                inode->i_op = &affs_symlink_inode_operations;
 148                inode->i_data.a_ops = &affs_symlink_aops;
 149                break;
 150        }
 151
 152        inode->i_mtime.tv_sec = inode->i_atime.tv_sec = inode->i_ctime.tv_sec
 153                       = (be32_to_cpu(tail->change.days) * (24 * 60 * 60) +
 154                         be32_to_cpu(tail->change.mins) * 60 +
 155                         be32_to_cpu(tail->change.ticks) / 50 +
 156                         ((8 * 365 + 2) * 24 * 60 * 60)) +
 157                         sys_tz.tz_minuteswest * 60;
 158        inode->i_mtime.tv_nsec = inode->i_ctime.tv_nsec = inode->i_atime.tv_nsec = 0;
 159        affs_brelse(bh);
 160        unlock_new_inode(inode);
 161        return inode;
 162
 163bad_inode:
 164        affs_brelse(bh);
 165        iget_failed(inode);
 166        return ERR_PTR(-EIO);
 167}
 168
 169int
 170affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 171{
 172        struct super_block      *sb = inode->i_sb;
 173        struct buffer_head      *bh;
 174        struct affs_tail        *tail;
 175        uid_t                    uid;
 176        gid_t                    gid;
 177
 178        pr_debug("AFFS: write_inode(%lu)\n",inode->i_ino);
 179
 180        if (!inode->i_nlink)
 181                // possibly free block
 182                return 0;
 183        bh = affs_bread(sb, inode->i_ino);
 184        if (!bh) {
 185                affs_error(sb,"write_inode","Cannot read block %lu",inode->i_ino);
 186                return -EIO;
 187        }
 188        tail = AFFS_TAIL(sb, bh);
 189        if (tail->stype == cpu_to_be32(ST_ROOT)) {
 190                secs_to_datestamp(inode->i_mtime.tv_sec,&AFFS_ROOT_TAIL(sb, bh)->root_change);
 191        } else {
 192                tail->protect = cpu_to_be32(AFFS_I(inode)->i_protect);
 193                tail->size = cpu_to_be32(inode->i_size);
 194                secs_to_datestamp(inode->i_mtime.tv_sec,&tail->change);
 195                if (!(inode->i_ino == AFFS_SB(sb)->s_root_block)) {
 196                        uid = inode->i_uid;
 197                        gid = inode->i_gid;
 198                        if (AFFS_SB(sb)->s_flags & SF_MUFS) {
 199                                if (inode->i_uid == 0 || inode->i_uid == 0xFFFF)
 200                                        uid = inode->i_uid ^ ~0;
 201                                if (inode->i_gid == 0 || inode->i_gid == 0xFFFF)
 202                                        gid = inode->i_gid ^ ~0;
 203                        }
 204                        if (!(AFFS_SB(sb)->s_flags & SF_SETUID))
 205                                tail->uid = cpu_to_be16(uid);
 206                        if (!(AFFS_SB(sb)->s_flags & SF_SETGID))
 207                                tail->gid = cpu_to_be16(gid);
 208                }
 209        }
 210        affs_fix_checksum(sb, bh);
 211        mark_buffer_dirty_inode(bh, inode);
 212        affs_brelse(bh);
 213        affs_free_prealloc(inode);
 214        return 0;
 215}
 216
 217int
 218affs_notify_change(struct dentry *dentry, struct iattr *attr)
 219{
 220        struct inode *inode = dentry->d_inode;
 221        int error;
 222
 223        pr_debug("AFFS: notify_change(%lu,0x%x)\n",inode->i_ino,attr->ia_valid);
 224
 225        error = inode_change_ok(inode,attr);
 226        if (error)
 227                goto out;
 228
 229        if (((attr->ia_valid & ATTR_UID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETUID)) ||
 230            ((attr->ia_valid & ATTR_GID) && (AFFS_SB(inode->i_sb)->s_flags & SF_SETGID)) ||
 231            ((attr->ia_valid & ATTR_MODE) &&
 232             (AFFS_SB(inode->i_sb)->s_flags & (SF_SETMODE | SF_IMMUTABLE)))) {
 233                if (!(AFFS_SB(inode->i_sb)->s_flags & SF_QUIET))
 234                        error = -EPERM;
 235                goto out;
 236        }
 237
 238        if ((attr->ia_valid & ATTR_SIZE) &&
 239            attr->ia_size != i_size_read(inode)) {
 240                error = vmtruncate(inode, attr->ia_size);
 241                if (error)
 242                        return error;
 243        }
 244
 245        setattr_copy(inode, attr);
 246        mark_inode_dirty(inode);
 247
 248        if (attr->ia_valid & ATTR_MODE)
 249                mode_to_prot(inode);
 250out:
 251        return error;
 252}
 253
 254void
 255affs_evict_inode(struct inode *inode)
 256{
 257        unsigned long cache_page;
 258        pr_debug("AFFS: evict_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
 259        truncate_inode_pages(&inode->i_data, 0);
 260
 261        if (!inode->i_nlink) {
 262                inode->i_size = 0;
 263                affs_truncate(inode);
 264        }
 265
 266        invalidate_inode_buffers(inode);
 267        clear_inode(inode);
 268        affs_free_prealloc(inode);
 269        cache_page = (unsigned long)AFFS_I(inode)->i_lc;
 270        if (cache_page) {
 271                pr_debug("AFFS: freeing ext cache\n");
 272                AFFS_I(inode)->i_lc = NULL;
 273                AFFS_I(inode)->i_ac = NULL;
 274                free_page(cache_page);
 275        }
 276        affs_brelse(AFFS_I(inode)->i_ext_bh);
 277        AFFS_I(inode)->i_ext_last = ~1;
 278        AFFS_I(inode)->i_ext_bh = NULL;
 279
 280        if (!inode->i_nlink)
 281                affs_free_block(inode->i_sb, inode->i_ino);
 282}
 283
 284struct inode *
 285affs_new_inode(struct inode *dir)
 286{
 287        struct super_block      *sb = dir->i_sb;
 288        struct inode            *inode;
 289        u32                      block;
 290        struct buffer_head      *bh;
 291
 292        if (!(inode = new_inode(sb)))
 293                goto err_inode;
 294
 295        if (!(block = affs_alloc_block(dir, dir->i_ino)))
 296                goto err_block;
 297
 298        bh = affs_getzeroblk(sb, block);
 299        if (!bh)
 300                goto err_bh;
 301        mark_buffer_dirty_inode(bh, inode);
 302        affs_brelse(bh);
 303
 304        inode->i_uid     = current_fsuid();
 305        inode->i_gid     = current_fsgid();
 306        inode->i_ino     = block;
 307        set_nlink(inode, 1);
 308        inode->i_mtime   = inode->i_atime = inode->i_ctime = CURRENT_TIME_SEC;
 309        atomic_set(&AFFS_I(inode)->i_opencnt, 0);
 310        AFFS_I(inode)->i_blkcnt = 0;
 311        AFFS_I(inode)->i_lc = NULL;
 312        AFFS_I(inode)->i_lc_size = 0;
 313        AFFS_I(inode)->i_lc_shift = 0;
 314        AFFS_I(inode)->i_lc_mask = 0;
 315        AFFS_I(inode)->i_ac = NULL;
 316        AFFS_I(inode)->i_ext_bh = NULL;
 317        AFFS_I(inode)->mmu_private = 0;
 318        AFFS_I(inode)->i_protect = 0;
 319        AFFS_I(inode)->i_lastalloc = 0;
 320        AFFS_I(inode)->i_pa_cnt = 0;
 321        AFFS_I(inode)->i_extcnt = 1;
 322        AFFS_I(inode)->i_ext_last = ~1;
 323
 324        insert_inode_hash(inode);
 325
 326        return inode;
 327
 328err_bh:
 329        affs_free_block(sb, block);
 330err_block:
 331        iput(inode);
 332err_inode:
 333        return NULL;
 334}
 335
 336/*
 337 * Add an entry to a directory. Create the header block
 338 * and insert it into the hash table.
 339 */
 340
 341int
 342affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s32 type)
 343{
 344        struct super_block *sb = dir->i_sb;
 345        struct buffer_head *inode_bh = NULL;
 346        struct buffer_head *bh = NULL;
 347        u32 block = 0;
 348        int retval;
 349
 350        pr_debug("AFFS: add_entry(dir=%u, inode=%u, \"%*s\", type=%d)\n", (u32)dir->i_ino,
 351                 (u32)inode->i_ino, (int)dentry->d_name.len, dentry->d_name.name, type);
 352
 353        retval = -EIO;
 354        bh = affs_bread(sb, inode->i_ino);
 355        if (!bh)
 356                goto done;
 357
 358        affs_lock_link(inode);
 359        switch (type) {
 360        case ST_LINKFILE:
 361        case ST_LINKDIR:
 362                retval = -ENOSPC;
 363                block = affs_alloc_block(dir, dir->i_ino);
 364                if (!block)
 365                        goto err;
 366                retval = -EIO;
 367                inode_bh = bh;
 368                bh = affs_getzeroblk(sb, block);
 369                if (!bh)
 370                        goto err;
 371                break;
 372        default:
 373                break;
 374        }
 375
 376        AFFS_HEAD(bh)->ptype = cpu_to_be32(T_SHORT);
 377        AFFS_HEAD(bh)->key = cpu_to_be32(bh->b_blocknr);
 378        affs_copy_name(AFFS_TAIL(sb, bh)->name, dentry);
 379        AFFS_TAIL(sb, bh)->stype = cpu_to_be32(type);
 380        AFFS_TAIL(sb, bh)->parent = cpu_to_be32(dir->i_ino);
 381
 382        if (inode_bh) {
 383                __be32 chain;
 384                chain = AFFS_TAIL(sb, inode_bh)->link_chain;
 385                AFFS_TAIL(sb, bh)->original = cpu_to_be32(inode->i_ino);
 386                AFFS_TAIL(sb, bh)->link_chain = chain;
 387                AFFS_TAIL(sb, inode_bh)->link_chain = cpu_to_be32(block);
 388                affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
 389                mark_buffer_dirty_inode(inode_bh, inode);
 390                set_nlink(inode, 2);
 391                ihold(inode);
 392        }
 393        affs_fix_checksum(sb, bh);
 394        mark_buffer_dirty_inode(bh, inode);
 395        dentry->d_fsdata = (void *)(long)bh->b_blocknr;
 396
 397        affs_lock_dir(dir);
 398        retval = affs_insert_hash(dir, bh);
 399        mark_buffer_dirty_inode(bh, inode);
 400        affs_unlock_dir(dir);
 401        affs_unlock_link(inode);
 402
 403        d_instantiate(dentry, inode);
 404done:
 405        affs_brelse(inode_bh);
 406        affs_brelse(bh);
 407        return retval;
 408err:
 409        if (block)
 410                affs_free_block(sb, block);
 411        affs_unlock_link(inode);
 412        goto done;
 413}
 414
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