From 02ff03a5a93668aa3964cc53918fcce37d99b744 Mon Sep 17 00:00:00 2001
From: sageweil <sageweil@29311d96-e01e-0410-9327-a35deaab8ce9>
Date: Wed, 19 Dec 2007 18:00:48 +0000
Subject: [PATCH] readdir over multiple fragments

git-svn-id: https://ceph.svn.sf.net/svnroot/ceph@2234 29311d96-e01e-0410-9327-a35deaab8ce9
---
 trunk/ceph/include/ceph_fs.h | 11 ++++++++++-
 trunk/ceph/kernel/dir.c      | 10 ++++++++--
 2 files changed, 18 insertions(+), 3 deletions(-)

diff --git a/trunk/ceph/include/ceph_fs.h b/trunk/ceph/include/ceph_fs.h
index 38d37c0e3ae5e..fa8e6091e985a 100644
--- a/trunk/ceph/include/ceph_fs.h
+++ b/trunk/ceph/include/ceph_fs.h
@@ -21,7 +21,7 @@ typedef __u64 ceph_tid_t;
 typedef __u32 ceph_epoch_t;
 
 
-/**
+/*
  * fs id
  */
 struct ceph_fsid {
@@ -54,8 +54,17 @@ struct ceph_timeval {
 	__u32 tv_usec;
 };
 
+/*
+ * dir fragments
+ */ 
 typedef __u32 ceph_frag_t;
 
+static inline __u32 frag_make(__u32 b, __u32 v) { return (b << 24) | (v & (0xffffffffull >> (32-b))); }
+static inline __u32 frag_bits(__u32 f) { return f >> 24; }
+static inline __u32 frag_value(__u32 f) { return f & 0xffffffu; }
+static inline __u32 frag_mask(__u32 f) { return 0xffffffffull >> (32-frag_bits(f)); }
+static inline __u32 frag_next(__u32 f) { return (frag_bits(f) << 24) | (frag_value(f)+1); }
+
 
 /*
  * object layout - how objects are mapped into PGs
diff --git a/trunk/ceph/kernel/dir.c b/trunk/ceph/kernel/dir.c
index c2a9453a327c4..549e345c40b33 100644
--- a/trunk/ceph/kernel/dir.c
+++ b/trunk/ceph/kernel/dir.c
@@ -31,7 +31,6 @@ static int get_dentry_path(struct dentry *dn, char *buf, struct dentry *base)
 
 struct ceph_inode_cap *ceph_open(struct inode *inode, struct file *file, int flags)
 {
-	struct ceph_inode_info *ci = ceph_inode(inode);
 	struct ceph_mds_client *mdsc = &ceph_inode_to_client(inode)->mdsc;
 	ceph_ino_t pathbase;
 	char path[PATH_MAX];
@@ -184,7 +183,14 @@ nextfrag:
 		filp->f_pos++;
 	}
 
-	// next frag?  FIXME ***
+	/* more frags? */
+	if (frag_value(frag) != frag_mask(frag)) {
+		frag = frag_next(frag);
+		off = 0;
+		filp->f_pos = make_fpos(frag, off);
+		dout(10, "dir_readdir next frag is %u\n", frag);
+		goto nextfrag;
+	}
 	
 	dout(20, "dir_readdir done.\n");
 	return 0;
-- 
2.39.5