source: branches/fc15-dev/server/common/patches/openafs-0005-linux-2.6.38-New-d_op-handling.patch @ 1882

From a615bc198e3fd99378d248eeb5868c773b0a2ec5 Mon Sep 17 00:00:00 2001
From: Marc Dionne <marc.c.dionne@gmail.com>
Date: Tue, 25 Jan 2011 17:17:21 -0500
Subject: [PATCH 5/8] linux: 2.6.38: New d_op handling

In 2.6.38, the super block structure has a new field to hold the
default dentry ops.  The vfs will automatically set it for new
dentries in most cases.

Set s_d_op to our set of operations, and omit setting the dentry
ops where the vfs will already do it (and where new locking rules
prohibit it).

Reviewed-on: http://gerrit.openafs.org/3758
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
(cherry picked from commit 08bb83d95027bb3ac68834d12b72bdc647fa24a9)

Change-Id: Ia808d6bcd119f3999a1805b1d31678f5a3ba3d55
Signed-off-by: Anders Kaseorg <andersk@mit.edu>
Reviewed-on: http://gerrit.openafs.org/3994
Reviewed-by: Simon Wilkinson <sxw@inf.ed.ac.uk>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Russ Allbery <rra@stanford.edu>
Reviewed-on: http://gerrit.openafs.org/4041
Reviewed-by: Derrick Brashear <shadow@dementia.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
---
 acinclude.m4                 |    1 +
 src/afs/LINUX/osi_vfsops.c   |    8 ++++++++
 src/afs/LINUX/osi_vnodeops.c |    6 ++++++
 3 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/acinclude.m4 b/acinclude.m4
index de82283..7904e20 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -749,6 +749,7 @@ case $AFS_SYSNAME in *_linux* | *_umlinux*)
                 LINUX_FS_STRUCT_SUPER_HAS_ALLOC_INODE
                 LINUX_FS_STRUCT_SUPER_HAS_EVICT_INODE
                 LINUX_FS_STRUCT_SUPER_BLOCK_HAS_S_BDI
+                AC_CHECK_LINUX_STRUCT([super_block], [s_d_op], [fs.h])
                 LINUX_STRUCT_BDI_HAS_NAME
                 LINUX_FS_STRUCT_ADDRESS_SPACE_HAS_PAGE_LOCK
                 LINUX_FS_STRUCT_ADDRESS_SPACE_HAS_GFP_MASK
diff --git a/src/afs/LINUX/osi_vfsops.c b/src/afs/LINUX/osi_vfsops.c
index fb69d39..2a937e4 100644
--- a/src/afs/LINUX/osi_vfsops.c
+++ b/src/afs/LINUX/osi_vfsops.c
@@ -140,6 +140,12 @@ afs_read_super(struct super_block *sb, void *data, int silent)
     sb->s_blocksize_bits = 10;
     sb->s_magic = AFS_VFSMAGIC;
     sb->s_op = &afs_sops;      /* Super block (vfs) ops */
+
+#if defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
+    sb->s_d_op = &afs_dentry_operations;
+#endif
+
+#if defined(AFS_LINUX26_ENV)
     /* used for inodes backing_dev_info field, also */
     afs_backing_dev_info = osi_Alloc(sizeof(struct backing_dev_info));
 #if defined(HAVE_BDI_INIT)
@@ -227,7 +233,9 @@ afs_root(struct super_block *afsp)
 #else
                afsp->s_root = d_alloc_root(ip, NULL);
 #endif
+#if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
                afsp->s_root->d_op = &afs_dentry_operations;
+#endif
            } else
                code = ENOENT;
        }
diff --git a/src/afs/LINUX/osi_vnodeops.c b/src/afs/LINUX/osi_vnodeops.c
index 8352769..03294b2 100644
--- a/src/afs/LINUX/osi_vnodeops.c
+++ b/src/afs/LINUX/osi_vnodeops.c
@@ -1067,7 +1067,9 @@ afs_linux_create(struct inode *dip, struct dentry *dp, int mode)
        afs_getattr(vcp, &vattr, credp);
        afs_fill_inode(ip, &vattr);
        insert_inode_hash(ip);
+#if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
        dp->d_op = &afs_dentry_operations;
+#endif
        dp->d_time = hgetlo(VTOAFS(dip)->m.DataVersion);
        d_instantiate(dp, ip);
     }
@@ -1123,7 +1125,9 @@ afs_linux_lookup(struct inode *dip, struct dentry *dp)
            )
            insert_inode_hash(ip);
     }
+#if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
     dp->d_op = &afs_dentry_operations;
+#endif
     dp->d_time = hgetlo(VTOAFS(dip)->m.DataVersion);
     AFS_GUNLOCK();
 
@@ -1315,7 +1319,9 @@ afs_linux_mkdir(struct inode *dip, struct dentry *dp, int mode)
        afs_getattr(tvcp, &vattr, credp);
        afs_fill_inode(ip, &vattr);
 
+#if !defined(STRUCT_SUPER_BLOCK_HAS_S_D_OP)
        dp->d_op = &afs_dentry_operations;
+#endif
        dp->d_time = hgetlo(VTOAFS(dip)->m.DataVersion);
        d_instantiate(dp, ip);
     }
-- 
1.7.3.4