inode.c

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    1 /*
    2  * QNX4 file system, Linux implementation.
    3  *
    4  * Version : 0.2.1
    5  *
    6  * Using parts of the xiafs filesystem.
    7  *
    8  * History :
    9  *
   10  * 01-06-1998 by Richard Frowijn : first release.
   11  * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
   12  * 30-06-1998 by Frank Denis : first step to write inodes.
   13  */
   14 
   15 #include <linux/config.h>
   16 #include <linux/module.h>
   17 #include <linux/types.h>
   18 #include <linux/string.h>
   19 #include <linux/errno.h>
   20 #include <linux/slab.h>
   21 #include <linux/qnx4_fs.h>
   22 #include <linux/fs.h>
   23 #include <linux/locks.h>
   24 #include <linux/init.h>
   25 #include <linux/highuid.h>
   26 #include <linux/smp_lock.h>
   27 
   28 #include <asm/uaccess.h>
   29 
   30 #define QNX4_VERSION  4
   31 #define QNX4_BMNAME   ".bitmap"
   32 
   33 static struct super_operations qnx4_sops;
   34 
   35 #ifdef CONFIG_QNX4FS_RW
   36 
   37 int qnx4_sync_inode(struct inode *inode)
   38 {
   39         int err = 0;
   40 # if 0
   41         struct buffer_head *bh;
   42 
   43         bh = qnx4_update_inode(inode);
   44         if (bh && buffer_dirty(bh))
   45         {
   46                 ll_rw_block(WRITE, 1, &bh);
   47                 wait_on_buffer(bh);
   48                 if (buffer_req(bh) && !buffer_uptodate(bh))
   49                 {
   50                         printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
   51                                 kdevname(inode->i_dev), inode->i_ino);
   52                         err = -1;
   53                 }
   54                 brelse (bh);
   55         } else if (!bh) {
   56                 err = -1;
   57         }
   58 # endif
   59 
   60         return err;
   61 }
   62 
   63 static void qnx4_delete_inode(struct inode *inode)
   64 {
   65         QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
   66         lock_kernel();
   67         inode->i_size = 0;
   68         qnx4_truncate(inode);
   69         qnx4_free_inode(inode);
   70         unlock_kernel();
   71 }
   72 
   73 static void qnx4_write_super(struct super_block *sb)
   74 {
   75         QNX4DEBUG(("qnx4: write_super\n"));
   76         sb->s_dirt = 0;
   77 }
   78 
   79 static void qnx4_write_inode(struct inode *inode, int unused)
   80 {
   81         struct qnx4_inode_entry *raw_inode;
   82         int block, ino;
   83         struct buffer_head *bh;
   84         ino = inode->i_ino;
   85 
   86         QNX4DEBUG(("qnx4: write inode 1.\n"));
   87         if (inode->i_nlink == 0) {
   88                 return;
   89         }
   90         if (!ino) {
   91                 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
   92                        kdevname(inode->i_dev), ino);
   93                 return;
   94         }
   95         QNX4DEBUG(("qnx4: write inode 2.\n"));
   96         block = ino / QNX4_INODES_PER_BLOCK;
   97         lock_kernel();
   98         if (!(bh = sb_bread(inode->i_sb, block))) {
   99                 printk("qnx4: major problem: unable to read inode from dev "
  100                        "%s\n", kdevname(inode->i_dev));
  101                 unlock_kernel();
  102                 return;
  103         }
  104         raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
  105             (ino % QNX4_INODES_PER_BLOCK);
  106         raw_inode->di_mode  = cpu_to_le16(inode->i_mode);
  107         raw_inode->di_uid   = cpu_to_le16(fs_high2lowuid(inode->i_uid));
  108         raw_inode->di_gid   = cpu_to_le16(fs_high2lowgid(inode->i_gid));
  109         raw_inode->di_nlink = cpu_to_le16(inode->i_nlink);
  110         raw_inode->di_size  = cpu_to_le32(inode->i_size);
  111         raw_inode->di_mtime = cpu_to_le32(inode->i_mtime);
  112         raw_inode->di_atime = cpu_to_le32(inode->i_atime);
  113         raw_inode->di_ctime = cpu_to_le32(inode->i_ctime);
  114         raw_inode->di_first_xtnt.xtnt_size = cpu_to_le32(inode->i_blocks);
  115         mark_buffer_dirty(bh);
  116         brelse(bh);
  117         unlock_kernel();
  118 }
  119 
  120 #endif
  121 
  122 static struct super_block *qnx4_read_super(struct super_block *, void *, int);
  123 static void qnx4_put_super(struct super_block *sb);
  124 static void qnx4_read_inode(struct inode *);
  125 static int qnx4_remount(struct super_block *sb, int *flags, char *data);
  126 static int qnx4_statfs(struct super_block *, struct statfs *);
  127 
  128 static struct super_operations qnx4_sops =
  129 {
  130         read_inode:     qnx4_read_inode,
  131 #ifdef CONFIG_QNX4FS_RW
  132         write_inode:    qnx4_write_inode,
  133         delete_inode:   qnx4_delete_inode,
  134 #endif
  135         put_super:      qnx4_put_super,
  136 #ifdef CONFIG_QNX4FS_RW
  137         write_super:    qnx4_write_super,
  138 #endif
  139         statfs:         qnx4_statfs,
  140         remount_fs:     qnx4_remount,
  141 };
  142 
  143 static int qnx4_remount(struct super_block *sb, int *flags, char *data)
  144 {
  145         struct qnx4_sb_info *qs;
  146 
  147         qs = &sb->u.qnx4_sb;
  148         qs->Version = QNX4_VERSION;
  149         if (*flags & MS_RDONLY) {
  150                 return 0;
  151         }
  152         mark_buffer_dirty(qs->sb_buf);
  153 
  154         return 0;
  155 }
  156 
  157 struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
  158                                  int create)
  159 {
  160         struct buffer_head *result = NULL;
  161 
  162         if ( nr >= 0 )
  163                 nr = qnx4_block_map( inode, nr );
  164         if (nr) {
  165                 result = sb_getblk(inode->i_sb, nr);
  166                 return result;
  167         }
  168         if (!create) {
  169                 return NULL;
  170         }
  171 #if 0
  172         tmp = qnx4_new_block(inode->i_sb);
  173         if (!tmp) {
  174                 return NULL;
  175         }
  176         result = sb_getblk(inode->i_sb, tmp);
  177         if (tst) {
  178                 qnx4_free_block(inode->i_sb, tmp);
  179                 brelse(result);
  180                 goto repeat;
  181         }
  182         tst = tmp;
  183 #endif
  184         inode->i_ctime = CURRENT_TIME;
  185         mark_inode_dirty(inode);
  186         return result;
  187 }
  188 
  189 struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
  190 {
  191         struct buffer_head *bh;
  192 
  193         bh = qnx4_getblk(inode, block, create);
  194         if (!bh || buffer_uptodate(bh)) {
  195                 return bh;
  196         }
  197         ll_rw_block(READ, 1, &bh);
  198         wait_on_buffer(bh);
  199         if (buffer_uptodate(bh)) {
  200                 return bh;
  201         }
  202         brelse(bh);
  203 
  204         return NULL;
  205 }
  206 
  207 int qnx4_get_block( struct inode *inode, long iblock, struct buffer_head *bh, int create )
  208 {
  209         unsigned long phys;
  210 
  211         QNX4DEBUG(("qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
  212 
  213         phys = qnx4_block_map( inode, iblock );
  214         if ( phys ) {
  215                 // logical block is before EOF
  216                 bh->b_dev     = inode->i_dev;
  217                 bh->b_blocknr = phys;
  218                 bh->b_state  |= (1UL << BH_Mapped);
  219         } else if ( create ) {
  220                 // to be done.
  221         }
  222         return 0;
  223 }
  224 
  225 unsigned long qnx4_block_map( struct inode *inode, long iblock )
  226 {
  227         int ix;
  228         long offset, i_xblk;
  229         unsigned long block = 0;
  230         struct buffer_head *bh = 0;
  231         struct qnx4_xblk *xblk = 0;
  232         struct qnx4_inode_info *qnx4_inode = &inode->u.qnx4_i;
  233         qnx4_nxtnt_t nxtnt = le16_to_cpu(qnx4_inode->i_num_xtnts);
  234 
  235         if ( iblock < le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size) ) {
  236                 // iblock is in the first extent. This is easy.
  237                 block = le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_blk) + iblock - 1;
  238         } else {
  239                 // iblock is beyond first extent. We have to follow the extent chain.
  240                 i_xblk = le32_to_cpu(qnx4_inode->i_xblk);
  241                 offset = iblock - le32_to_cpu(qnx4_inode->i_first_xtnt.xtnt_size);
  242                 ix = 0;
  243                 while ( --nxtnt > 0 ) {
  244                         if ( ix == 0 ) {
  245                                 // read next xtnt block.
  246                                 bh = sb_bread(inode->i_sb, i_xblk - 1);
  247                                 if ( !bh ) {
  248                                         QNX4DEBUG(("qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
  249                                         return -EIO;
  250                                 }
  251                                 xblk = (struct qnx4_xblk*)bh->b_data;
  252                                 if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
  253                                         QNX4DEBUG(("qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
  254                                         return -EIO;
  255                                 }
  256                         }
  257                         if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
  258                                 // got it!
  259                                 block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
  260                                 break;
  261                         }
  262                         offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
  263                         if ( ++ix >= xblk->xblk_num_xtnts ) {
  264                                 i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
  265                                 ix = 0;
  266                                 brelse( bh );
  267                                 bh = 0;
  268                         }
  269                 }
  270                 if ( bh )
  271                         brelse( bh );
  272         }
  273 
  274         QNX4DEBUG(("qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
  275         return block;
  276 }
  277 
  278 static int qnx4_statfs(struct super_block *sb, struct statfs *buf)
  279 {
  280         buf->f_type    = sb->s_magic;
  281         buf->f_bsize   = sb->s_blocksize;
  282         buf->f_blocks  = le32_to_cpu(sb->u.qnx4_sb.BitMap->di_size) * 8;
  283         buf->f_bfree   = qnx4_count_free_blocks(sb);
  284         buf->f_bavail  = buf->f_bfree;
  285         buf->f_namelen = QNX4_NAME_MAX;
  286 
  287         return 0;
  288 }
  289 
  290 /*
  291  * Check the root directory of the filesystem to make sure
  292  * it really _is_ a qnx4 filesystem, and to check the size
  293  * of the directory entry.
  294  */
  295 static const char *qnx4_checkroot(struct super_block *sb)
  296 {
  297         struct buffer_head *bh;
  298         struct qnx4_inode_entry *rootdir;
  299         int rd, rl;
  300         int i, j;
  301         int found = 0;
  302 
  303         if (*(sb->u.qnx4_sb.sb->RootDir.di_fname) != '/') {
  304                 return "no qnx4 filesystem (no root dir).";
  305         } else {
  306                 QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", kdevname(sb->s_dev)));
  307                 rd = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
  308                 rl = le32_to_cpu(sb->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_size);
  309                 for (j = 0; j < rl; j++) {
  310                         bh = sb_bread(sb, rd + j);      /* root dir, first block */
  311                         if (bh == NULL) {
  312                                 return "unable to read root entry.";
  313                         }
  314                         for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
  315                                 rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
  316                                 if (rootdir->di_fname != NULL) {
  317                                         QNX4DEBUG(("Rootdir entry found : [%s]\n", rootdir->di_fname));
  318                                         if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
  319                                                 found = 1;
  320                                                 sb->u.qnx4_sb.BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
  321                                                 if (!sb->u.qnx4_sb.BitMap) {
  322                                                         brelse (bh);
  323                                                         return "not enough memory for bitmap inode";
  324                                                 }
  325                                                 memcpy( sb->u.qnx4_sb.BitMap, rootdir, sizeof( struct qnx4_inode_entry ) );     /* keep bitmap inode known */
  326                                                 break;
  327                                         }
  328                                 }
  329                         }
  330                         brelse(bh);
  331                         if (found != 0) {
  332                                 break;
  333                         }
  334                 }
  335                 if (found == 0) {
  336                         return "bitmap file not found.";
  337                 }
  338         }
  339         return NULL;
  340 }
  341 
  342 static struct super_block *qnx4_read_super(struct super_block *s,
  343                                            void *data, int silent)
  344 {
  345         struct buffer_head *bh;
  346         kdev_t dev = s->s_dev;
  347         struct inode *root;
  348         const char *errmsg;
  349 
  350         set_blocksize(dev, QNX4_BLOCK_SIZE);
  351         s->s_blocksize = QNX4_BLOCK_SIZE;
  352         s->s_blocksize_bits = QNX4_BLOCK_SIZE_BITS;
  353 
  354         /* Check the superblock signature. Since the qnx4 code is
  355            dangerous, we should leave as quickly as possible
  356            if we don't belong here... */
  357         bh = sb_bread(s, 1);
  358         if (!bh) {
  359                 printk("qnx4: unable to read the superblock\n");
  360                 goto outnobh;
  361         }
  362         if ( le32_to_cpu( *(__u32*)bh->b_data ) != QNX4_SUPER_MAGIC ) {
  363                 if (!silent)
  364                         printk("qnx4: wrong fsid in superblock sector.\n");
  365                 goto out;
  366         }
  367         s->s_op = &qnx4_sops;
  368         s->s_magic = QNX4_SUPER_MAGIC;
  369 #ifndef CONFIG_QNX4FS_RW
  370         s->s_flags |= MS_RDONLY;        /* Yup, read-only yet */
  371 #endif
  372         s->u.qnx4_sb.sb_buf = bh;
  373         s->u.qnx4_sb.sb = (struct qnx4_super_block *) bh->b_data;
  374 
  375 
  376         /* check before allocating dentries, inodes, .. */
  377         errmsg = qnx4_checkroot(s);
  378         if (errmsg != NULL) {
  379                 if (!silent)
  380                         printk("qnx4: %s\n", errmsg);
  381                 goto out;
  382         }
  383 
  384         /* does root not have inode number QNX4_ROOT_INO ?? */
  385         root = iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
  386         if (!root) {
  387                 printk("qnx4: get inode failed\n");
  388                 goto out;
  389         }
  390 
  391         s->s_root = d_alloc_root(root);
  392         if (s->s_root == NULL)
  393                 goto outi;
  394 
  395         brelse(bh);
  396 
  397         return s;
  398 
  399       outi:
  400         iput(root);
  401       out:
  402         brelse(bh);
  403       outnobh:
  404 
  405         return NULL;
  406 }
  407 
  408 static void qnx4_put_super(struct super_block *sb)
  409 {
  410         kfree( sb->u.qnx4_sb.BitMap );
  411         return;
  412 }
  413 
  414 static int qnx4_writepage(struct page *page)
  415 {
  416         return block_write_full_page(page,qnx4_get_block);
  417 }
  418 static int qnx4_readpage(struct file *file, struct page *page)
  419 {
  420         return block_read_full_page(page,qnx4_get_block);
  421 }
  422 static int qnx4_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
  423 {
  424         return cont_prepare_write(page,from,to,qnx4_get_block,
  425                 &page->mapping->host->u.qnx4_i.mmu_private);
  426 }
  427 static int qnx4_bmap(struct address_space *mapping, long block)
  428 {
  429         return generic_block_bmap(mapping,block,qnx4_get_block);
  430 }
  431 struct address_space_operations qnx4_aops = {
  432         readpage: qnx4_readpage,
  433         writepage: qnx4_writepage,
  434         sync_page: block_sync_page,
  435         prepare_write: qnx4_prepare_write,
  436         commit_write: generic_commit_write,
  437         bmap: qnx4_bmap
  438 };
  439 
  440 static void qnx4_read_inode(struct inode *inode)
  441 {
  442         struct buffer_head *bh;
  443         struct qnx4_inode_entry *raw_inode;
  444         int block, ino;
  445 
  446         ino = inode->i_ino;
  447         inode->i_mode = 0;
  448 
  449         QNX4DEBUG(("Reading inode : [%d]\n", ino));
  450         if (!ino) {
  451                 printk("qnx4: bad inode number on dev %s: %d is out of range\n",
  452                        kdevname(inode->i_dev), ino);
  453                 return;
  454         }
  455         block = ino / QNX4_INODES_PER_BLOCK;
  456 
  457         if (!(bh = sb_bread(inode->i_sb, block))) {
  458                 printk("qnx4: major problem: unable to read inode from dev "
  459                        "%s\n", kdevname(inode->i_dev));
  460                 return;
  461         }
  462         raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
  463             (ino % QNX4_INODES_PER_BLOCK);
  464 
  465         inode->i_mode    = le16_to_cpu(raw_inode->di_mode);
  466         inode->i_uid     = (uid_t)le16_to_cpu(raw_inode->di_uid);
  467         inode->i_gid     = (gid_t)le16_to_cpu(raw_inode->di_gid);
  468         inode->i_nlink   = le16_to_cpu(raw_inode->di_nlink);
  469         inode->i_size    = le32_to_cpu(raw_inode->di_size);
  470         inode->i_mtime   = le32_to_cpu(raw_inode->di_mtime);
  471         inode->i_atime   = le32_to_cpu(raw_inode->di_atime);
  472         inode->i_ctime   = le32_to_cpu(raw_inode->di_ctime);
  473         inode->i_blocks  = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
  474         inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
  475 
  476         memcpy(&inode->u.qnx4_i, (struct qnx4_inode_info *) raw_inode, QNX4_DIR_ENTRY_SIZE);
  477         if (S_ISREG(inode->i_mode)) {
  478                 inode->i_op = &qnx4_file_inode_operations;
  479                 inode->i_fop = &qnx4_file_operations;
  480                 inode->i_mapping->a_ops = &qnx4_aops;
  481                 inode->u.qnx4_i.mmu_private = inode->i_size;
  482         } else if (S_ISDIR(inode->i_mode)) {
  483                 inode->i_op = &qnx4_dir_inode_operations;
  484                 inode->i_fop = &qnx4_dir_operations;
  485         } else if (S_ISLNK(inode->i_mode)) {
  486                 inode->i_op = &page_symlink_inode_operations;
  487                 inode->i_mapping->a_ops = &qnx4_aops;
  488                 inode->u.qnx4_i.mmu_private = inode->i_size;
  489         } else
  490                 printk("qnx4: bad inode %d on dev %s\n",ino,kdevname(inode->i_dev));
  491         brelse(bh);
  492 }
  493 
  494 static DECLARE_FSTYPE_DEV(qnx4_fs_type, "qnx4", qnx4_read_super);
  495 
  496 static int __init init_qnx4_fs(void)
  497 {
  498         printk("QNX4 filesystem 0.2.2 registered.\n");
  499         return register_filesystem(&qnx4_fs_type);
  500 }
  501 
  502 static void __exit exit_qnx4_fs(void)
  503 {
  504         unregister_filesystem(&qnx4_fs_type);
  505 }
  506 
  507 EXPORT_NO_SYMBOLS;
  508 
  509 module_init(init_qnx4_fs)
  510 module_exit(exit_qnx4_fs)
  511 MODULE_LICENSE("GPL");
  512
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FreeBSD/Linux Kernel Cross Reference sys/fs/qnx4/inode.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/qnx4/inode.c
