NFS support for btrfs - v3

Date: Mon, 21 Jul 2008 02:01:56 +0530
Here's an implementation of NFS support for btrfs. It relies on the
fixes which are going in to 2.6.28 for the NFS readdir/lookup deadlock.

This uses the btrfs_iget helper introduced previously.

[dwmw2: Tidy up a little, switch to d_obtain_alias() w/compat routine,
	change fh_type,	store parent's root object ID where needed,
	fix some get_parent() and fs_to_dentry() bugs]

Signed-off-by: Balaji Rao <balajirrao@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
index b3349a66999d..d45fb37887bc 100644
--- a/fs/btrfs/compat.h
+++ b/fs/btrfs/compat.h
@@ -5,6 +5,23 @@
 #define trylock_page(page) (!TestSetPageLocked(page))
 #endif
 
+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,27)
+static inline struct dentry *d_obtain_alias(struct inode *inode)
+{
+        struct dentry *d;
+
+        if (!inode)
+                return NULL;
+        if (IS_ERR(inode))
+                return ERR_CAST(inode);
+
+        d = d_alloc_anon(inode);
+        if (!d)
+                iput(inode);
+        return d;
+}
+#endif
+
 /*
  * Even if AppArmor isn't enabled, it still has different prototypes.
  * Add more distro/version pairs here to declare which has AppArmor applied.