patch-2.1.120 linux/fs/qnx4/inode.c

• Lines: 464
• Date: Tue Sep 1 10:43:13 1998
• Orig file: v2.1.119/linux/fs/qnx4/inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.1.119/linux/fs/qnx4/inode.c linux/fs/qnx4/inode.c
@@ -0,0 +1,463 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.1
+ * 
+ * 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/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/malloc.h>
+#include <linux/qnx4_fs.h>
+#include <linux/fs.h>
+#include <linux/locks.h>
+#include <linux/init.h>
+
+#include <asm/uaccess.h>
+
+#define QNX4_VERSION  4
+#define QNX4_BMNAME   ".bitmap"
+#define CHECK_BOOT_SIGNATURE 0
+
+static struct super_operations qnx4_sops;
+
+#ifdef CONFIG_QNX4FS_RW
+
+int qnx4_sync_inode(struct inode *inode)
+{
+	int err = 0;
+# if 0
+	struct buffer_head *bh;
+
+   	bh = qnx4_update_inode(inode);
+	if (bh && buffer_dirty(bh))
+	{
+		ll_rw_block(WRITE, 1, &bh);
+		wait_on_buffer(bh);
+		if (buffer_req(bh) && !buffer_uptodate(bh))
+		{
+			printk ("IO error syncing qnx4 inode [%s:%08lx]\n",
+				kdevname(inode->i_dev), inode->i_ino);
+			err = -1;
+		}
+	        brelse (bh);	   
+	} else if (!bh) {
+		err = -1;
+	}
+# endif
+
+	return err;
+}
+
+static void qnx4_delete_inode(struct inode *inode)
+{
+	QNX4DEBUG(("qnx4: deleting inode [%lu]\n", (unsigned long) inode->i_ino));
+	inode->i_size = 0;
+	qnx4_truncate(inode);
+	qnx4_free_inode(inode);
+}
+
+static void qnx4_write_super(struct super_block *sb)
+{
+	QNX4DEBUG(("qnx4: write_super\n"));
+	sb->s_dirt = 0;
+}
+
+static void qnx4_put_inode(struct inode *inode)
+{
+	if (inode->i_nlink != 0) {
+		return;
+	}
+	inode->i_size = 0;
+}
+
+static void qnx4_write_inode(struct inode *inode)
+{
+	struct qnx4_inode_entry *raw_inode;
+	int block, ino;
+	struct buffer_head *bh;
+	ino = inode->i_ino;
+
+	QNX4DEBUG(("qnx4: write inode 1.\n"));
+	if (inode->i_nlink == 0) {
+		return;
+	}
+	if (!ino) {
+		printk("qnx4: bad inode number on dev %s: %d is out of range\n",
+		       kdevname(inode->i_dev), ino);
+		return;
+	}
+	QNX4DEBUG(("qnx4: write inode 2.\n"));
+	block = ino / QNX4_INODES_PER_BLOCK;
+	if (!(bh = bread(inode->i_dev, block, QNX4_BLOCK_SIZE))) {
+		printk("qnx4: major problem: unable to read inode from dev "
+		       "%s\n", kdevname(inode->i_dev));
+		return;
+	}
+	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
+	    (ino % QNX4_INODES_PER_BLOCK);
+	raw_inode->di_mode = inode->i_mode;
+	raw_inode->di_uid = inode->i_uid;
+	raw_inode->di_gid = inode->i_gid;
+	raw_inode->di_nlink = inode->i_nlink;
+	raw_inode->di_size = inode->i_size;
+	raw_inode->di_mtime = inode->i_mtime;
+	raw_inode->di_atime = inode->i_atime;
+	raw_inode->di_ctime = inode->i_ctime;
+	raw_inode->di_first_xtnt.xtnt_size = inode->i_blocks;
+	mark_buffer_dirty(bh, 1);
+	brelse(bh);
+}
+
+#endif
+
+static struct super_block *qnx4_read_super(struct super_block *, void *, int);
+static void qnx4_put_super(struct super_block *sb);
+static void qnx4_read_inode(struct inode *);
+static int qnx4_remount(struct super_block *sb, int *flags, char *data);
+static int qnx4_statfs(struct super_block *, struct statfs *, int);
+
+static struct super_operations qnx4_sops =
+{
+	qnx4_read_inode,
+#ifdef CONFIG_QNX4FS_RW
+	qnx4_write_inode,
+#else
+	NULL,
+#endif
+	qnx4_put_inode,
+#ifdef CONFIG_QNX4FS_RW
+	qnx4_delete_inode,
+	NULL,			/* notify_change */
+#else
+	NULL,			/* delete_inode */
+	NULL,			/* notify_change */
+#endif
+	qnx4_put_super,
+#ifdef CONFIG_QNX4FS_RW
+	qnx4_write_super,
+#else
+	NULL,
+#endif
+	qnx4_statfs,
+	qnx4_remount,
+	NULL			/* clear_inode */
+};
+
+static int qnx4_remount(struct super_block *sb, int *flags, char *data)
+{
+	struct qnx4_sb_info *qs;
+
+	qs = &sb->u.qnx4_sb;
+	qs->Version = QNX4_VERSION;
+	if (*flags & MS_RDONLY) {
+		return 0;
+	}
+	mark_buffer_dirty(qs->sb_buf, 1);
+
+	return 0;
+}
+
+struct buffer_head *inode_getblk(struct inode *inode, int nr,
+				 int create)
+{
+	int tmp;
+	int tst;
+	struct buffer_head *result = NULL;
+
+	tst = nr;
+      repeat:
+	tmp = tst;
+	if (tmp) {
+		result = getblk(inode->i_dev, tmp, QNX4_BLOCK_SIZE);
+		if (tmp == tst) {
+			return result;
+		}
+		brelse(result);
+		goto repeat;
+	}
+	if (!create) {
+		return NULL;
+	}
+#if 0
+	tmp = qnx4_new_block(inode->i_sb);
+	if (!tmp) {
+		return NULL;
+	}
+	result = getblk(inode->i_dev, tmp, QNX4_BLOCK_SIZE);
+	if (tst) {
+		qnx4_free_block(inode->i_sb, tmp);
+		brelse(result);
+		goto repeat;
+	}
+	tst = tmp;
+#endif
+	inode->i_ctime = CURRENT_TIME;
+	mark_inode_dirty(inode);
+	return result;
+}
+
+struct buffer_head *qnx4_bread(struct inode *inode, int block, int create)
+{
+	struct buffer_head *bh;
+
+	bh = inode_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_statfs(struct super_block *sb,
+		       struct statfs *buf, int bufsize)
+{
+	struct statfs tmp;
+
+	memset(&tmp, 0, sizeof tmp);
+	tmp.f_type = sb->s_magic;
+	tmp.f_bsize = sb->s_blocksize;
+	tmp.f_blocks = le32_to_cpu(sb->u.qnx4_sb.BitMap->di_size) * 8;
+	tmp.f_bfree = qnx4_count_free_blocks(sb);
+	tmp.f_bavail = tmp.f_bfree;
+	tmp.f_files = 0x00;	/* change this !!! */
+	tmp.f_ffree = qnx4_count_free_inodes(sb);
+	tmp.f_namelen = QNX4_NAME_MAX;
+
+	return copy_to_user(buf, &tmp, bufsize) ? -EFAULT : 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 *s)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *rootdir;
+	int rd, rl;
+	int i, j;
+	int found = 0;
+
+	if (s == NULL) {
+		return "no qnx4 filesystem (null superblock).";
+	}
+	if (*(s->u.qnx4_sb.sb->RootDir.di_fname) != '/') {
+		return "no qnx4 filesystem (no root dir).";
+	} else {
+		QNX4DEBUG(("QNX4 filesystem found on dev %s.\n", kdevname(s->s_dev)));
+		rd = s->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_blk - 1;
+		rl = s->u.qnx4_sb.sb->RootDir.di_first_xtnt.xtnt_size;
+		for (j = 0; j < rl; j++) {
+			bh = bread(s->s_dev, rd + j, QNX4_BLOCK_SIZE);	/* 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(("Rootdir entry found : [%s]\n", rootdir->di_fname));
+					if (!strncmp(rootdir->di_fname, QNX4_BMNAME, sizeof QNX4_BMNAME)) {
+						found = 1;
+						s->u.qnx4_sb.BitMap = rootdir;	/* keep bitmap inode known */
+						break;
+					}
+				}
+			}
+			brelse(bh);
+			if (found != 0) {
+				break;
+			}
+		}
+		if (found == 0) {
+			return "bitmap file not found.";
+		}
+	}
+	return NULL;
+}
+
+static struct super_block *qnx4_read_super(struct super_block *s, 
+					   void *data, int silent)
+{
+	struct buffer_head *bh;
+	kdev_t dev = s->s_dev;
+#if CHECK_BOOT_SIGNATURE
+	char *tmpc;
+#endif
+	const char *errmsg;
+
+	MOD_INC_USE_COUNT;
+	lock_super(s);
+	set_blocksize(dev, QNX4_BLOCK_SIZE);
+	s->s_blocksize = QNX4_BLOCK_SIZE;
+	s->s_blocksize_bits = 9;
+	s->s_dev = dev;
+
+#if CHECK_BOOT_SIGNATURE
+	bh = bread(dev, 0, QNX4_BLOCK_SIZE);
+	if (!bh) {
+		printk("qnx4: unable to read the boot sector\n");
+		goto outnobh;
+	}
+	tmpc = (char *) bh->b_data;
+	if (tmpc[4] != 'Q' || tmpc[5] != 'N' || tmpc[6] != 'X' ||
+	    tmpc[7] != '4' || tmpc[8] != 'F' || tmpc[9] != 'S') {
+		printk("qnx4: wrong fsid in boot sector.\n");
+		goto out;
+	}
+	brelse(bh);
+#endif
+	bh = bread(dev, 1, QNX4_BLOCK_SIZE);
+	if (!bh) {
+		printk("qnx4: unable to read the superblock\n");
+		goto outnobh;
+	}
+	s->s_op = &qnx4_sops;
+	s->s_magic = QNX4_SUPER_MAGIC;
+#ifndef CONFIG_QNX4FS_RW
+	s->s_flags |= MS_RDONLY;	/* Yup, read-only yet */
+#endif
+	s->u.qnx4_sb.sb_buf = bh;
+	s->u.qnx4_sb.sb = (struct qnx4_super_block *) bh->b_data;
+	s->s_root =
+	    d_alloc_root(iget(s, QNX4_ROOT_INO * QNX4_INODES_PER_BLOCK), NULL);
+	if (s->s_root == NULL) {
+		printk("qnx4: get inode failed\n");
+		goto out;
+	}
+	errmsg = qnx4_checkroot(s);
+	if (errmsg != NULL) {
+		printk("qnx4: %s\n", errmsg);
+		goto out;
+	}
+	brelse(bh);
+	unlock_super(s);
+	s->s_dirt = 1;
+
+	return s;
+
+      out:
+	brelse(bh);
+      outnobh:
+	s->s_dev = 0;
+	unlock_super(s);
+	MOD_DEC_USE_COUNT;
+
+	return NULL;
+}
+
+static void qnx4_put_super(struct super_block *sb)
+{
+	MOD_DEC_USE_COUNT;
+	return;
+}
+
+static void qnx4_read_inode(struct inode *inode)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *raw_inode;
+	int block, ino;
+
+	ino = inode->i_ino;
+	inode->i_op = NULL;
+	inode->i_mode = 0;
+
+	QNX4DEBUG(("Reading inode : [%d]\n", ino));
+	if (!ino) {
+		printk("qnx4: bad inode number on dev %s: %d is out of range\n",
+		       kdevname(inode->i_dev), ino);
+		return;
+	}
+	block = ino / QNX4_INODES_PER_BLOCK;
+
+	if (!(bh = bread(inode->i_dev, block, QNX4_BLOCK_SIZE))) {
+		printk("qnx4: major problem: unable to read inode from dev "
+		       "%s\n", kdevname(inode->i_dev));
+		return;
+	}
+	raw_inode = ((struct qnx4_inode_entry *) bh->b_data) +
+	    (ino % QNX4_INODES_PER_BLOCK);
+
+	inode->i_mode = raw_inode->di_mode;
+	inode->i_uid = raw_inode->di_uid;
+	inode->i_gid = raw_inode->di_gid;
+	inode->i_nlink = raw_inode->di_nlink;
+	inode->i_size = raw_inode->di_size;
+	inode->i_mtime = raw_inode->di_mtime;
+	inode->i_atime = raw_inode->di_atime;
+	inode->i_ctime = raw_inode->di_ctime;
+	inode->i_blocks = raw_inode->di_first_xtnt.xtnt_size;
+	inode->i_blksize = QNX4_DIR_ENTRY_SIZE;
+
+	memcpy(&inode->u.qnx4_i, (struct qnx4_inode_info *) raw_inode, QNX4_DIR_ENTRY_SIZE);
+	inode->i_op = &qnx4_file_inode_operations;
+	if (S_ISREG(inode->i_mode)) {
+		inode->i_op = &qnx4_file_inode_operations;
+	} else {
+		if (S_ISDIR(inode->i_mode)) {
+			inode->i_op = &qnx4_dir_inode_operations;
+		} else {
+			if (S_ISLNK(inode->i_mode)) {
+				inode->i_op = &qnx4_symlink_inode_operations;
+			} else {
+				if (S_ISCHR(inode->i_mode)) {
+					inode->i_op = &chrdev_inode_operations;
+				} else {
+					if (S_ISBLK(inode->i_mode)) {
+						inode->i_op = &blkdev_inode_operations;
+					} else {
+						if (S_ISFIFO(inode->i_mode)) {
+							init_fifo(inode);
+						}
+					}
+				}
+			}
+		}
+	}
+	brelse(bh);
+}
+
+static struct file_system_type qnx4_fs_type =
+{
+	"qnx4",
+	FS_REQUIRES_DEV,
+	qnx4_read_super,
+	NULL
+};
+
+__initfunc(int init_qnx4_fs(void))
+{
+	printk("QNX4 filesystem v0.2 registered.\n");
+	return register_filesystem(&qnx4_fs_type);
+}
+
+#ifdef MODULE
+EXPORT_NO_SYMBOLS;
+
+int init_module(void)
+{
+	return init_qnx4_fs();
+}
+
+void cleanup_module(void)
+{
+	unregister_filesystem(&qnx4_fs_type);
+}
+
+#endif