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-rw-r--r--fs/qnx4/inode.c504
1 files changed, 504 insertions, 0 deletions
diff --git a/fs/qnx4/inode.c b/fs/qnx4/inode.c
new file mode 100644
index 00000000..2b064661
--- /dev/null
+++ b/fs/qnx4/inode.c
@@ -0,0 +1,504 @@
+/*
+ * QNX4 file system, Linux implementation.
+ *
+ * Version : 0.2.1
+ *
+ * Using parts of the xiafs filesystem.
+ *
+ * History :
+ *
+ * 01-06-1998 by Richard Frowijn : first release.
+ * 20-06-1998 by Frank Denis : Linux 2.1.99+ support, boot signature, misc.
+ * 30-06-1998 by Frank Denis : first step to write inodes.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/highuid.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include <linux/writeback.h>
+#include <linux/statfs.h>
+#include "qnx4.h"
+
+#define QNX4_VERSION 4
+#define QNX4_BMNAME ".bitmap"
+
+static const struct super_operations qnx4_sops;
+
+static void qnx4_put_super(struct super_block *sb);
+static struct inode *qnx4_alloc_inode(struct super_block *sb);
+static void qnx4_destroy_inode(struct inode *inode);
+static int qnx4_remount(struct super_block *sb, int *flags, char *data);
+static int qnx4_statfs(struct dentry *, struct kstatfs *);
+
+static const struct super_operations qnx4_sops =
+{
+ .alloc_inode = qnx4_alloc_inode,
+ .destroy_inode = qnx4_destroy_inode,
+ .put_super = qnx4_put_super,
+ .statfs = qnx4_statfs,
+ .remount_fs = qnx4_remount,
+};
+
+static int qnx4_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct qnx4_sb_info *qs;
+
+ qs = qnx4_sb(sb);
+ qs->Version = QNX4_VERSION;
+ *flags |= MS_RDONLY;
+ return 0;
+}
+
+static struct buffer_head *qnx4_getblk(struct inode *inode, int nr,
+ int create)
+{
+ struct buffer_head *result = NULL;
+
+ if ( nr >= 0 )
+ nr = qnx4_block_map( inode, nr );
+ if (nr) {
+ result = sb_getblk(inode->i_sb, nr);
+ return result;
+ }
+ return NULL;
+}
+
+struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
+{
+ struct buffer_head *bh;
+
+ bh = qnx4_getblk(inode, block, create);
+ if (!bh || buffer_uptodate(bh)) {
+ return bh;
+ }
+ ll_rw_block(READ, 1, &bh);
+ wait_on_buffer(bh);
+ if (buffer_uptodate(bh)) {
+ return bh;
+ }
+ brelse(bh);
+
+ return NULL;
+}
+
+static int qnx4_get_block( struct inode *inode, sector_t iblock, struct buffer_head *bh, int create )
+{
+ unsigned long phys;
+
+ QNX4DEBUG((KERN_INFO "qnx4: qnx4_get_block inode=[%ld] iblock=[%ld]\n",inode->i_ino,iblock));
+
+ phys = qnx4_block_map( inode, iblock );
+ if ( phys ) {
+ // logical block is before EOF
+ map_bh(bh, inode->i_sb, phys);
+ }
+ return 0;
+}
+
+unsigned long qnx4_block_map( struct inode *inode, long iblock )
+{
+ int ix;
+ long offset, i_xblk;
+ unsigned long block = 0;
+ struct buffer_head *bh = NULL;
+ struct qnx4_xblk *xblk = NULL;
+ struct qnx4_inode_entry *qnx4_inode = qnx4_raw_inode(inode);
+ u16 nxtnt = le16_to_cpu(qnx4_inode->di_num_xtnts);
+
+ if ( iblock < le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size) ) {
+ // iblock is in the first extent. This is easy.
+ block = le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_blk) + iblock - 1;
+ } else {
+ // iblock is beyond first extent. We have to follow the extent chain.
+ i_xblk = le32_to_cpu(qnx4_inode->di_xblk);
+ offset = iblock - le32_to_cpu(qnx4_inode->di_first_xtnt.xtnt_size);
+ ix = 0;
+ while ( --nxtnt > 0 ) {
+ if ( ix == 0 ) {
+ // read next xtnt block.
+ bh = sb_bread(inode->i_sb, i_xblk - 1);
+ if ( !bh ) {
+ QNX4DEBUG((KERN_ERR "qnx4: I/O error reading xtnt block [%ld])\n", i_xblk - 1));
+ return -EIO;
+ }
+ xblk = (struct qnx4_xblk*)bh->b_data;
+ if ( memcmp( xblk->xblk_signature, "IamXblk", 7 ) ) {
+ QNX4DEBUG((KERN_ERR "qnx4: block at %ld is not a valid xtnt\n", qnx4_inode->i_xblk));
+ return -EIO;
+ }
+ }
+ if ( offset < le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size) ) {
+ // got it!
+ block = le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_blk) + offset - 1;
+ break;
+ }
+ offset -= le32_to_cpu(xblk->xblk_xtnts[ix].xtnt_size);
+ if ( ++ix >= xblk->xblk_num_xtnts ) {
+ i_xblk = le32_to_cpu(xblk->xblk_next_xblk);
+ ix = 0;
+ brelse( bh );
+ bh = NULL;
+ }
+ }
+ if ( bh )
+ brelse( bh );
+ }
+
+ QNX4DEBUG((KERN_INFO "qnx4: mapping block %ld of inode %ld = %ld\n",iblock,inode->i_ino,block));
+ return block;
+}
+
+static int qnx4_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
+
+ buf->f_type = sb->s_magic;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = le32_to_cpu(qnx4_sb(sb)->BitMap->di_size) * 8;
+ buf->f_bfree = qnx4_count_free_blocks(sb);
+ buf->f_bavail = buf->f_bfree;
+ buf->f_namelen = QNX4_NAME_MAX;
+ buf->f_fsid.val[0] = (u32)id;
+ buf->f_fsid.val[1] = (u32)(id >> 32);
+
+ return 0;
+}
+
+/*
+ * Check the root directory of the filesystem to make sure
+ * it really _is_ a qnx4 filesystem, and to check the size
+ * of the directory entry.
+ */
+static const char *qnx4_checkroot(struct super_block *sb)
+{
+ struct buffer_head *bh;
+ struct qnx4_inode_entry *rootdir;
+ int rd, rl;
+ int i, j;
+ int found = 0;
+
+ if (*(qnx4_sb(sb)->sb->RootDir.di_fname) != '/') {
+ return "no qnx4 filesystem (no root dir).";
+ } else {
+ QNX4DEBUG((KERN_NOTICE "QNX4 filesystem found on dev %s.\n", sb->s_id));
+ rd = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_blk) - 1;
+ rl = le32_to_cpu(qnx4_sb(sb)->sb->RootDir.di_first_xtnt.xtnt_size);
+ for (j = 0; j < rl; j++) {
+ bh = sb_bread(sb, rd + j); /* root dir, first block */
+ if (bh == NULL) {
+ return "unable to read root entry.";
+ }
+ for (i = 0; i < QNX4_INODES_PER_BLOCK; i++) {
+ rootdir = (struct qnx4_inode_entry *) (bh->b_data + i * QNX4_DIR_ENTRY_SIZE);
+ if (rootdir->di_fname != NULL) {
+ QNX4DEBUG((KERN_INFO "rootdir entry found : [%s]\n", rootdir->di_fname));
+ if (!strcmp(rootdir->di_fname,
+ QNX4_BMNAME)) {
+ found = 1;
+ qnx4_sb(sb)->BitMap = kmalloc( sizeof( struct qnx4_inode_entry ), GFP_KERNEL );
+ if (!qnx4_sb(sb)->BitMap) {
+ brelse (bh);
+ return "not enough memory for bitmap inode";
+ }
+ memcpy( qnx4_sb(sb)->BitMap, rootdir, sizeof( struct qnx4_inode_entry ) ); /* keep bitmap inode known */
+ break;
+ }
+ }
+ }
+ brelse(bh);
+ if (found != 0) {
+ break;
+ }
+ }
+ if (found == 0) {
+ return "bitmap file not found.";
+ }
+ }
+ return NULL;
+}
+
+static int qnx4_fill_super(struct super_block *s, void *data, int silent)
+{
+ struct buffer_head *bh;
+ struct inode *root;
+ const char *errmsg;
+ struct qnx4_sb_info *qs;
+ int ret = -EINVAL;
+
+ qs = kzalloc(sizeof(struct qnx4_sb_info), GFP_KERNEL);
+ if (!qs)
+ return -ENOMEM;
+ s->s_fs_info = qs;
+
+ sb_set_blocksize(s, QNX4_BLOCK_SIZE);
+
+ /* Check the superblock signature. Since the qnx4 code is
+ dangerous, we should leave as quickly as possible
+ if we don't belong here... */
+ bh = sb_bread(s, 1);
+ if (!bh) {
+ printk(KERN_ERR "qnx4: unable to read the superblock\n");
+ goto outnobh;
+ }
+ if ( le32_to_cpup((__le32*) bh->b_data) != QNX4_SUPER_MAGIC ) {
+ if (!silent)
+ printk(KERN_ERR "qnx4: wrong fsid in superblock.\n");
+ goto out;
+ }
+ s->s_op = &qnx4_sops;
+ s->s_magic = QNX4_SUPER_MAGIC;
+ s->s_flags |= MS_RDONLY; /* Yup, read-only yet */
+ qnx4_sb(s)->sb_buf = bh;
+ qnx4_sb(s)->sb = (struct qnx4_super_block *) bh->b_data;
+
+
+ /* check before allocating dentries, inodes, .. */
+ errmsg = qnx4_checkroot(s);
+ if (errmsg != NULL) {
+ if (!silent)
+ printk(KERN_ERR "qnx4: %s\n", errmsg);
+ goto out;
+ }
+
+ /* does root not have inode number QNX4_ROOT_INO ?? */
+ root = qnx4_iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK);
+ if (IS_ERR(root)) {
+ printk(KERN_ERR "qnx4: get inode failed\n");
+ ret = PTR_ERR(root);
+ goto out;
+ }
+
+ ret = -ENOMEM;
+ s->s_root = d_alloc_root(root);
+ if (s->s_root == NULL)
+ goto outi;
+
+ brelse(bh);
+ return 0;
+
+ outi:
+ iput(root);
+ out:
+ brelse(bh);
+ outnobh:
+ kfree(qs);
+ s->s_fs_info = NULL;
+ return ret;
+}
+
+static void qnx4_put_super(struct super_block *sb)
+{
+ struct qnx4_sb_info *qs = qnx4_sb(sb);
+ kfree( qs->BitMap );
+ kfree( qs );
+ sb->s_fs_info = NULL;
+ return;
+}
+
+static int qnx4_writepage(struct page *page, struct writeback_control *wbc)
+{
+ return block_write_full_page(page,qnx4_get_block, wbc);
+}
+
+static int qnx4_readpage(struct file *file, struct page *page)
+{
+ return block_read_full_page(page,qnx4_get_block);
+}
+
+static int qnx4_write_begin(struct file *file, struct address_space *mapping,
+ loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, void **fsdata)
+{
+ struct qnx4_inode_info *qnx4_inode = qnx4_i(mapping->host);
+ int ret;
+
+ *pagep = NULL;
+ ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
+ qnx4_get_block,
+ &qnx4_inode->mmu_private);
+ if (unlikely(ret)) {
+ loff_t isize = mapping->host->i_size;
+ if (pos + len > isize)
+ vmtruncate(mapping->host, isize);
+ }
+
+ return ret;
+}
+static sector_t qnx4_bmap(struct address_space *mapping, sector_t block)
+{
+ return generic_block_bmap(mapping,block,qnx4_get_block);
+}
+static const struct address_space_operations qnx4_aops = {
+ .readpage = qnx4_readpage,
+ .writepage = qnx4_writepage,
+ .write_begin = qnx4_write_begin,
+ .write_end = generic_write_end,
+ .bmap = qnx4_bmap
+};
+
+struct inode *qnx4_iget(struct super_block *sb, unsigned long ino)
+{
+ struct buffer_head *bh;
+ struct qnx4_inode_entry *raw_inode;
+ int block;
+ struct qnx4_inode_entry *qnx4_inode;
+ struct inode *inode;
+
+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ qnx4_inode = qnx4_raw_inode(inode);
+ inode->i_mode = 0;
+
+ QNX4DEBUG((KERN_INFO "reading inode : [%d]\n", ino));
+ if (!ino) {
+ printk(KERN_ERR "qnx4: bad inode number on dev %s: %lu is "
+ "out of range\n",
+ sb->s_id, ino);
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
+ }
+ block = ino / QNX4_INODES_PER_BLOCK;
+
+ if (!(bh = sb_bread(sb, block))) {
+ printk(KERN_ERR "qnx4: major problem: unable to read inode from dev "
+ "%s\n", sb->s_id);
+ iget_failed(inode);
+ return ERR_PTR(-EIO);
+ }
+ raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
+ (ino % QNX4_INODES_PER_BLOCK);
+
+ inode->i_mode = le16_to_cpu(raw_inode->di_mode);
+ inode->i_uid = (uid_t)le16_to_cpu(raw_inode->di_uid);
+ inode->i_gid = (gid_t)le16_to_cpu(raw_inode->di_gid);
+ inode->i_nlink = le16_to_cpu(raw_inode->di_nlink);
+ inode->i_size = le32_to_cpu(raw_inode->di_size);
+ inode->i_mtime.tv_sec = le32_to_cpu(raw_inode->di_mtime);
+ inode->i_mtime.tv_nsec = 0;
+ inode->i_atime.tv_sec = le32_to_cpu(raw_inode->di_atime);
+ inode->i_atime.tv_nsec = 0;
+ inode->i_ctime.tv_sec = le32_to_cpu(raw_inode->di_ctime);
+ inode->i_ctime.tv_nsec = 0;
+ inode->i_blocks = le32_to_cpu(raw_inode->di_first_xtnt.xtnt_size);
+
+ memcpy(qnx4_inode, raw_inode, QNX4_DIR_ENTRY_SIZE);
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = &generic_ro_fops;
+ inode->i_mapping->a_ops = &qnx4_aops;
+ qnx4_i(inode)->mmu_private = inode->i_size;
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = &qnx4_dir_inode_operations;
+ inode->i_fop = &qnx4_dir_operations;
+ } else if (S_ISLNK(inode->i_mode)) {
+ inode->i_op = &page_symlink_inode_operations;
+ inode->i_mapping->a_ops = &qnx4_aops;
+ qnx4_i(inode)->mmu_private = inode->i_size;
+ } else {
+ printk(KERN_ERR "qnx4: bad inode %lu on dev %s\n",
+ ino, sb->s_id);
+ iget_failed(inode);
+ brelse(bh);
+ return ERR_PTR(-EIO);
+ }
+ brelse(bh);
+ unlock_new_inode(inode);
+ return inode;
+}
+
+static struct kmem_cache *qnx4_inode_cachep;
+
+static struct inode *qnx4_alloc_inode(struct super_block *sb)
+{
+ struct qnx4_inode_info *ei;
+ ei = kmem_cache_alloc(qnx4_inode_cachep, GFP_KERNEL);
+ if (!ei)
+ return NULL;
+ return &ei->vfs_inode;
+}
+
+static void qnx4_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
+}
+
+static void qnx4_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, qnx4_i_callback);
+}
+
+static void init_once(void *foo)
+{
+ struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
+
+ inode_init_once(&ei->vfs_inode);
+}
+
+static int init_inodecache(void)
+{
+ qnx4_inode_cachep = kmem_cache_create("qnx4_inode_cache",
+ sizeof(struct qnx4_inode_info),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD),
+ init_once);
+ if (qnx4_inode_cachep == NULL)
+ return -ENOMEM;
+ return 0;
+}
+
+static void destroy_inodecache(void)
+{
+ kmem_cache_destroy(qnx4_inode_cachep);
+}
+
+static struct dentry *qnx4_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ return mount_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
+}
+
+static struct file_system_type qnx4_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "qnx4",
+ .mount = qnx4_mount,
+ .kill_sb = kill_block_super,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+static int __init init_qnx4_fs(void)
+{
+ int err;
+
+ err = init_inodecache();
+ if (err)
+ return err;
+
+ err = register_filesystem(&qnx4_fs_type);
+ if (err) {
+ destroy_inodecache();
+ return err;
+ }
+
+ printk(KERN_INFO "QNX4 filesystem 0.2.3 registered.\n");
+ return 0;
+}
+
+static void __exit exit_qnx4_fs(void)
+{
+ unregister_filesystem(&qnx4_fs_type);
+ destroy_inodecache();
+}
+
+module_init(init_qnx4_fs)
+module_exit(exit_qnx4_fs)
+MODULE_LICENSE("GPL");
+
generated by cgit v1.2.3 (git 2.25.1) at 2025-01-14 13:37:37 +0000