Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 249 insertions, 0 deletions

diff --git a/fs/qnx4/namei.c b/fs/qnx4/namei.c
new file mode 100644
index 000000000000..4af4951d7f54
--- /dev/null
+++ b/fs/qnx4/namei.c
@@ -0,0 +1,249 @@
+/* 
+ * QNX4 file system, Linux implementation.
+ * 
+ * Version : 0.2.1
+ * 
+ * Using parts of the xiafs filesystem.
+ * 
+ * History :
+ * 
+ * 01-06-1998 by Richard Frowijn : first release.
+ * 21-06-1998 by Frank Denis : dcache support, fixed error codes.
+ * 04-07-1998 by Frank Denis : first step for rmdir/unlink.
+ */
+
+#include <linux/config.h>
+#include <linux/time.h>
+#include <linux/fs.h>
+#include <linux/qnx4_fs.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/fcntl.h>
+#include <linux/errno.h>
+#include <linux/smp_lock.h>
+#include <linux/buffer_head.h>
+
+
+/*
+ * check if the filename is correct. For some obscure reason, qnx writes a
+ * new file twice in the directory entry, first with all possible options at 0
+ * and for a second time the way it is, they want us not to access the qnx
+ * filesystem when whe are using linux.
+ */
+static int qnx4_match(int len, const char *name,
+		      struct buffer_head *bh, unsigned long *offset)
+{
+	struct qnx4_inode_entry *de;
+	int namelen, thislen;
+
+	if (bh == NULL) {
+		printk("qnx4: matching unassigned buffer !\n");
+		return 0;
+	}
+	de = (struct qnx4_inode_entry *) (bh->b_data + *offset);
+	*offset += QNX4_DIR_ENTRY_SIZE;
+	if ((de->di_status & QNX4_FILE_LINK) != 0) {
+		namelen = QNX4_NAME_MAX;
+	} else {
+		namelen = QNX4_SHORT_NAME_MAX;
+	}
+	/* "" means "." ---> so paths like "/usr/lib//libc.a" work */
+	if (!len && (de->di_fname[0] == '.') && (de->di_fname[1] == '\0')) {
+		return 1;
+	}
+	thislen = strlen( de->di_fname );
+	if ( thislen > namelen )
+		thislen = namelen;
+	if (len != thislen) {
+		return 0;
+	}
+	if (strncmp(name, de->di_fname, len) == 0) {
+		if ((de->di_status & (QNX4_FILE_USED|QNX4_FILE_LINK)) != 0) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static struct buffer_head *qnx4_find_entry(int len, struct inode *dir,
+	   const char *name, struct qnx4_inode_entry **res_dir, int *ino)
+{
+	unsigned long block, offset, blkofs;
+	struct buffer_head *bh;
+
+	*res_dir = NULL;
+	if (!dir->i_sb) {
+		printk("qnx4: no superblock on dir.\n");
+		return NULL;
+	}
+	bh = NULL;
+	block = offset = blkofs = 0;
+	while (blkofs * QNX4_BLOCK_SIZE + offset < dir->i_size) {
+		if (!bh) {
+			bh = qnx4_bread(dir, blkofs, 0);
+			if (!bh) {
+				blkofs++;
+				continue;
+			}
+		}
+		*res_dir = (struct qnx4_inode_entry *) (bh->b_data + offset);
+		if (qnx4_match(len, name, bh, &offset)) {
+			block = qnx4_block_map( dir, blkofs );
+			*ino = block * QNX4_INODES_PER_BLOCK +
+			    (offset / QNX4_DIR_ENTRY_SIZE) - 1;
+			return bh;
+		}
+		if (offset < bh->b_size) {
+			continue;
+		}
+		brelse(bh);
+		bh = NULL;
+		offset = 0;
+		blkofs++;
+	}
+	brelse(bh);
+	*res_dir = NULL;
+	return NULL;
+}
+
+struct dentry * qnx4_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd)
+{
+	int ino;
+	struct qnx4_inode_entry *de;
+	struct qnx4_link_info *lnk;
+	struct buffer_head *bh;
+	const char *name = dentry->d_name.name;
+	int len = dentry->d_name.len;
+	struct inode *foundinode = NULL;
+
+	lock_kernel();
+	if (!(bh = qnx4_find_entry(len, dir, name, &de, &ino)))
+		goto out;
+	/* The entry is linked, let's get the real info */
+	if ((de->di_status & QNX4_FILE_LINK) == QNX4_FILE_LINK) {
+		lnk = (struct qnx4_link_info *) de;
+		ino = (le32_to_cpu(lnk->dl_inode_blk) - 1) *
+                    QNX4_INODES_PER_BLOCK +
+		    lnk->dl_inode_ndx;
+	}
+	brelse(bh);
+
+	if ((foundinode = iget(dir->i_sb, ino)) == NULL) {
+		unlock_kernel();
+		QNX4DEBUG(("qnx4: lookup->iget -> NULL\n"));
+		return ERR_PTR(-EACCES);
+	}
+out:
+	unlock_kernel();
+	d_add(dentry, foundinode);
+
+	return NULL;
+}
+
+#ifdef CONFIG_QNX4FS_RW
+int qnx4_create(struct inode *dir, struct dentry *dentry, int mode,
+		struct nameidata *nd)
+{
+	QNX4DEBUG(("qnx4: qnx4_create\n"));
+	if (dir == NULL) {
+		return -ENOENT;
+	}
+	return -ENOSPC;
+}
+
+int qnx4_rmdir(struct inode *dir, struct dentry *dentry)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *de;
+	struct inode *inode;
+	int retval;
+	int ino;
+
+	QNX4DEBUG(("qnx4: qnx4_rmdir [%s]\n", dentry->d_name.name));
+	lock_kernel();
+	bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
+			     &de, &ino);
+	if (bh == NULL) {
+		unlock_kernel();
+		return -ENOENT;
+	}
+	inode = dentry->d_inode;
+	if (inode->i_ino != ino) {
+		retval = -EIO;
+		goto end_rmdir;
+	}
+#if 0
+	if (!empty_dir(inode)) {
+		retval = -ENOTEMPTY;
+		goto end_rmdir;
+	}
+#endif
+	if (inode->i_nlink != 2) {
+		QNX4DEBUG(("empty directory has nlink!=2 (%d)\n", inode->i_nlink));
+	}
+	QNX4DEBUG(("qnx4: deleting directory\n"));
+	de->di_status = 0;
+	memset(de->di_fname, 0, sizeof de->di_fname);
+	de->di_mode = 0;
+	mark_buffer_dirty(bh);
+	inode->i_nlink = 0;
+	mark_inode_dirty(inode);
+	inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
+	dir->i_nlink--;
+	mark_inode_dirty(dir);
+	retval = 0;
+
+      end_rmdir:
+	brelse(bh);
+
+	unlock_kernel();
+	return retval;
+}
+
+int qnx4_unlink(struct inode *dir, struct dentry *dentry)
+{
+	struct buffer_head *bh;
+	struct qnx4_inode_entry *de;
+	struct inode *inode;
+	int retval;
+	int ino;
+
+	QNX4DEBUG(("qnx4: qnx4_unlink [%s]\n", dentry->d_name.name));
+	lock_kernel();
+	bh = qnx4_find_entry(dentry->d_name.len, dir, dentry->d_name.name,
+			     &de, &ino);
+	if (bh == NULL) {
+		unlock_kernel();
+		return -ENOENT;
+	}
+	inode = dentry->d_inode;
+	if (inode->i_ino != ino) {
+		retval = -EIO;
+		goto end_unlink;
+	}
+	retval = -EPERM;
+	if (!inode->i_nlink) {
+		QNX4DEBUG(("Deleting nonexistent file (%s:%lu), %d\n",
+			   inode->i_sb->s_id,
+			   inode->i_ino, inode->i_nlink));
+		inode->i_nlink = 1;
+	}
+	de->di_status = 0;
+	memset(de->di_fname, 0, sizeof de->di_fname);
+	de->di_mode = 0;
+	mark_buffer_dirty(bh);
+	dir->i_ctime = dir->i_mtime = CURRENT_TIME_SEC;
+	mark_inode_dirty(dir);
+	inode->i_nlink--;
+	inode->i_ctime = dir->i_ctime;
+	mark_inode_dirty(inode);
+	retval = 0;
+
+end_unlink:
+	unlock_kernel();
+	brelse(bh);
+
+	return retval;
+}
+#endif