From 0fb256419d48beadc6236481b6b27839e6ad6dd9 Mon Sep 17 00:00:00 2001
From: Chaskiel M Grundman <cg2v@andrew.cmu.edu>
Date: Thu, 14 Apr 2005 02:14:21 +0000
Subject: [PATCH] linux-inotify-sem-20050413

FIXES 18260

add inotify sem detection
---
 acinclude.m4          |  1 +
 src/afs/afs_vcache.c  |  6 +++++-
 src/cf/linux-test4.m4 | 15 +++++++++++++++
 3 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/acinclude.m4 b/acinclude.m4
index 5aac39851d..56869efd2d 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -570,6 +570,7 @@ case $AFS_SYSNAME in *_linux* | *_umlinux*)
 		 LINUX_FS_STRUCT_INODE_HAS_I_SB_LIST
 		 LINUX_FS_STRUCT_INODE_HAS_I_SECURITY
 		 LINUX_FS_STRUCT_INODE_HAS_INOTIFY_LOCK
+		 LINUX_FS_STRUCT_INODE_HAS_INOTIFY_SEM
 	  	 LINUX_INODE_SETATTR_RETURN_TYPE
 	  	 LINUX_WRITE_INODE_RETURN_TYPE
 	  	 LINUX_IOP_NAMEIDATA
diff --git a/src/afs/afs_vcache.c b/src/afs/afs_vcache.c
index 74957b3eb6..d3167fad3b 100644
--- a/src/afs/afs_vcache.c
+++ b/src/afs/afs_vcache.c
@@ -933,9 +933,13 @@ restart:
 #ifdef STRUCT_INODE_HAS_I_SB_LIST
 	list_add(&ip->i_sb_list, &ip->i_sb->s_inodes);
 #endif
-#ifdef STRUCT_INODE_HAS_INOTIFY_LOCK
+#if defined(STRUCT_INODE_HAS_INOTIFY_LOCK) || defined(STRUCT_INODE_HAS_INOTIFY_SEM)
 	INIT_LIST_HEAD(&ip->inotify_watches); 
+#if defined(STRUCT_INODE_HAS_INOTIFY_SEM) 
+	sema_init(&ip->inotify_sem); 
+#else
 	spin_lock_init(&ip->inotify_lock); 
+#endif 
 #endif 
     }
 #endif
diff --git a/src/cf/linux-test4.m4 b/src/cf/linux-test4.m4
index fa80d54c52..ffb96e42b0 100644
--- a/src/cf/linux-test4.m4
+++ b/src/cf/linux-test4.m4
@@ -251,6 +251,21 @@ ac_cv_linux_fs_struct_inode_has_inotify_lock=no)])
 AC_MSG_RESULT($ac_cv_linux_fs_struct_inode_has_inotify_lock)
 CPPFLAGS="$save_CPPFLAGS"])
 
+AC_DEFUN([LINUX_FS_STRUCT_INODE_HAS_INOTIFY_SEM], [
+AC_MSG_CHECKING(for inotify_sem in struct inode)
+save_CPPFLAGS="$CPPFLAGS"
+CPPFLAGS="-I${LINUX_KERNEL_PATH}/include -I${LINUX_KERNEL_PATH}/include/asm/mach-${SUBARCH} -D__KERNEL__ $CPPFLAGS"
+AC_CACHE_VAL(ac_cv_linux_fs_struct_inode_has_inotify_sem, 
+[
+AC_TRY_COMPILE(
+[#include <linux/fs.h>],
+[struct inode _inode;
+printf("%x\n", _inode.inotify_sem);], 
+ac_cv_linux_fs_struct_inode_has_inotify_sem=yes,
+ac_cv_linux_fs_struct_inode_has_inotify_sem=no)])
+AC_MSG_RESULT($ac_cv_linux_fs_struct_inode_has_inotify_sem)
+CPPFLAGS="$save_CPPFLAGS"])
+
 
 AC_DEFUN([LINUX_FS_STRUCT_INODE_HAS_I_MAPPING_OVERLOAD], [
 AC_MSG_CHECKING(for i_mapping_overload in struct inode)