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, 228 insertions, 0 deletions

diff --git a/fs/isofs/export.c b/fs/isofs/export.c
new file mode 100644
index 000000000000..e4252c960871
--- /dev/null
+++ b/fs/isofs/export.c
@@ -0,0 +1,228 @@
+/*
+ * fs/isofs/export.c
+ *
+ *  (C) 2004  Paul Serice - The new inode scheme requires switching
+ *                          from iget() to iget5_locked() which means
+ *                          the NFS export operations have to be hand
+ *                          coded because the default routines rely on
+ *                          iget().
+ *
+ * The following files are helpful:
+ *
+ *     Documentation/filesystems/Exporting
+ *     fs/exportfs/expfs.c.
+ */
+
+#include <linux/buffer_head.h>
+#include <linux/errno.h>
+#include <linux/fs.h>
+#include <linux/iso_fs.h>
+#include <linux/kernel.h>
+
+static struct dentry *
+isofs_export_iget(struct super_block *sb,
+		  unsigned long block,
+		  unsigned long offset,
+		  __u32 generation)
+{
+	struct inode *inode;
+	struct dentry *result;
+	if (block == 0)
+		return ERR_PTR(-ESTALE);
+	inode = isofs_iget(sb, block, offset);
+	if (inode == NULL)
+		return ERR_PTR(-ENOMEM);
+	if (is_bad_inode(inode)
+	    || (generation && inode->i_generation != generation))
+	{
+		iput(inode);
+		return ERR_PTR(-ESTALE);
+	}
+	result = d_alloc_anon(inode);
+	if (!result) {
+		iput(inode);
+		return ERR_PTR(-ENOMEM);
+	}
+	return result;
+}
+
+static struct dentry *
+isofs_export_get_dentry(struct super_block *sb, void *vobjp)
+{
+	__u32 *objp = vobjp;
+	unsigned long block = objp[0];
+	unsigned long offset = objp[1];
+	__u32 generation = objp[2];
+	return isofs_export_iget(sb, block, offset, generation);
+}
+
+/* This function is surprisingly simple.  The trick is understanding
+ * that "child" is always a directory. So, to find its parent, you
+ * simply need to find its ".." entry, normalize its block and offset,
+ * and return the underlying inode.  See the comments for
+ * isofs_normalize_block_and_offset(). */
+static struct dentry *isofs_export_get_parent(struct dentry *child)
+{
+	unsigned long parent_block = 0;
+	unsigned long parent_offset = 0;
+	struct inode *child_inode = child->d_inode;
+	struct iso_inode_info *e_child_inode = ISOFS_I(child_inode);
+	struct inode *parent_inode = NULL;
+	struct iso_directory_record *de = NULL;
+	struct buffer_head * bh = NULL;
+	struct dentry *rv = NULL;
+
+	/* "child" must always be a directory. */
+	if (!S_ISDIR(child_inode->i_mode)) {
+		printk(KERN_ERR "isofs: isofs_export_get_parent(): "
+		       "child is not a directory!\n");
+		rv = ERR_PTR(-EACCES);
+		goto out;
+	}
+
+	/* It is an invariant that the directory offset is zero.  If
+	 * it is not zero, it means the directory failed to be
+	 * normalized for some reason. */
+	if (e_child_inode->i_iget5_offset != 0) {
+		printk(KERN_ERR "isofs: isofs_export_get_parent(): "
+		       "child directory not normalized!\n");
+		rv = ERR_PTR(-EACCES);
+		goto out;
+	}
+
+	/* The child inode has been normalized such that its
+	 * i_iget5_block value points to the "." entry.  Fortunately,
+	 * the ".." entry is located in the same block. */
+	parent_block = e_child_inode->i_iget5_block;
+
+	/* Get the block in question. */
+	bh = sb_bread(child_inode->i_sb, parent_block);
+	if (bh == NULL) {
+		rv = ERR_PTR(-EACCES);
+		goto out;
+	}
+
+	/* This is the "." entry. */
+	de = (struct iso_directory_record*)bh->b_data;
+
+	/* The ".." entry is always the second entry. */
+	parent_offset = (unsigned long)isonum_711(de->length);
+	de = (struct iso_directory_record*)(bh->b_data + parent_offset);
+
+	/* Verify it is in fact the ".." entry. */
+	if ((isonum_711(de->name_len) != 1) || (de->name[0] != 1)) {
+		printk(KERN_ERR "isofs: Unable to find the \"..\" "
+		       "directory for NFS.\n");
+		rv = ERR_PTR(-EACCES);
+		goto out;
+	}
+
+	/* Normalize */
+	isofs_normalize_block_and_offset(de, &parent_block, &parent_offset);
+
+	/* Get the inode. */
+	parent_inode = isofs_iget(child_inode->i_sb,
+				  parent_block,
+				  parent_offset);
+	if (parent_inode == NULL) {
+		rv = ERR_PTR(-EACCES);
+		goto out;
+	}
+
+	/* Allocate the dentry. */
+	rv = d_alloc_anon(parent_inode);
+	if (rv == NULL) {
+		rv = ERR_PTR(-ENOMEM);
+		goto out;
+	}
+
+ out:
+	if (bh) {
+		brelse(bh);
+	}
+	return rv;
+}
+
+static int
+isofs_export_encode_fh(struct dentry *dentry,
+		       __u32 *fh32,
+		       int *max_len,
+		       int connectable)
+{
+	struct inode * inode = dentry->d_inode;
+	struct iso_inode_info * ei = ISOFS_I(inode);
+	int len = *max_len;
+	int type = 1;
+	__u16 *fh16 = (__u16*)fh32;
+
+	/*
+	 * WARNING: max_len is 5 for NFSv2.  Because of this
+	 * limitation, we use the lower 16 bits of fh32[1] to hold the
+	 * offset of the inode and the upper 16 bits of fh32[1] to
+	 * hold the offset of the parent.
+	 */
+
+	if (len < 3 || (connectable && len < 5))
+		return 255;
+
+	len = 3;
+	fh32[0] = ei->i_iget5_block;
+ 	fh16[2] = (__u16)ei->i_iget5_offset;  /* fh16 [sic] */
+	fh32[2] = inode->i_generation;
+	if (connectable && !S_ISDIR(inode->i_mode)) {
+		struct inode *parent;
+		struct iso_inode_info *eparent;
+		spin_lock(&dentry->d_lock);
+		parent = dentry->d_parent->d_inode;
+		eparent = ISOFS_I(parent);
+		fh32[3] = eparent->i_iget5_block;
+		fh16[3] = (__u16)eparent->i_iget5_offset;  /* fh16 [sic] */
+		fh32[4] = parent->i_generation;
+		spin_unlock(&dentry->d_lock);
+		len = 5;
+		type = 2;
+	}
+	*max_len = len;
+	return type;
+}
+
+
+static struct dentry *
+isofs_export_decode_fh(struct super_block *sb,
+		       __u32 *fh32,
+		       int fh_len,
+		       int fileid_type,
+		       int (*acceptable)(void *context, struct dentry *de),
+		       void *context)
+{
+	__u16 *fh16 = (__u16*)fh32;
+	__u32 child[3];   /* The child is what triggered all this. */
+	__u32 parent[3];  /* The parent is just along for the ride. */
+
+	if (fh_len < 3 || fileid_type > 2)
+		return NULL;
+
+	child[0] = fh32[0];
+	child[1] = fh16[2];  /* fh16 [sic] */
+	child[2] = fh32[2];
+
+	parent[0] = 0;
+	parent[1] = 0;
+	parent[2] = 0;
+	if (fileid_type == 2) {
+		if (fh_len > 2) parent[0] = fh32[3];
+		parent[1] = fh16[3];  /* fh16 [sic] */
+		if (fh_len > 4) parent[2] = fh32[4];
+	}
+
+	return sb->s_export_op->find_exported_dentry(sb, child, parent,
+						     acceptable, context);
+}
+
+
+struct export_operations isofs_export_ops = {
+	.decode_fh	= isofs_export_decode_fh,
+	.encode_fh	= isofs_export_encode_fh,
+	.get_dentry	= isofs_export_get_dentry,
+	.get_parent     = isofs_export_get_parent,
+};