commit d69671d54764c966ffc1614a5c32945512eebbbc
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Sun Nov 18 16:36:27 2007 -0500
Unionfs: use poison.h for safe poison pointers
This also fixes a compile warning on 64-bit systems.
Signed-off-by: Josef 'Jeff' Sipek <[EMAIL PROTECTED]>
Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>
diff --git a/fs/unionfs/debug.c b/fs/unionfs/debug.c
index 9546a41..224773e 100644
--- a/fs/unionfs/debug.c
+++ b/fs/unionfs/debug.c
@@ -25,14 +25,6 @@
} \
} while (0)
-#if BITS_PER_LONG == 32
-#define POISONED_PTR ((void*) 0x5a5a5a5a)
-#elif BITS_PER_LONG == 64
-#define POISONED_PTR ((void*) 0x5a5a5a5a5a5a5a5a)
-#else
-#error Unknown BITS_PER_LONG value
-#endif /* BITS_PER_LONG != known */
-
/*
* __unionfs_check_{inode,dentry,file} perform exhaustive sanity checking on
* the fan-out of various Unionfs objects. We check that no lower objects
@@ -50,6 +42,7 @@ void __unionfs_check_inode(const struct inode *inode,
struct inode *lower_inode;
struct super_block *sb;
int printed_caller = 0;
+ void *poison_ptr;
/* for inodes now */
BUG_ON(!inode);
@@ -88,12 +81,13 @@ void __unionfs_check_inode(const struct inode *inode,
}
lower_inode = unionfs_lower_inode_idx(inode, bindex);
if (lower_inode) {
+ memset(&poison_ptr, POISON_INUSE, sizeof(void *));
if (bindex < istart || bindex > iend) {
PRINT_CALLER(fname, fxn, line);
printk(" Ci5: inode/linode=%p:%p bindex=%d "
"istart/end=%d:%d\n", inode,
lower_inode, bindex, istart, iend);
- } else if (lower_inode == POISONED_PTR) {
+ } else if (lower_inode == poison_ptr) {
/* freed inode! */
PRINT_CALLER(fname, fxn, line);
printk(" Ci6: inode/linode=%p:%p bindex=%d "
@@ -130,6 +124,7 @@ void __unionfs_check_dentry(const struct dentry *dentry,
struct super_block *sb;
struct vfsmount *lower_mnt;
int printed_caller = 0;
+ void *poison_ptr;
BUG_ON(!dentry);
sb = dentry->d_sb;
@@ -256,12 +251,13 @@ void __unionfs_check_dentry(const struct dentry *dentry,
for (bindex = sbstart(sb); bindex < sbmax(sb); bindex++) {
lower_inode = unionfs_lower_inode_idx(inode, bindex);
if (lower_inode) {
+ memset(&poison_ptr, POISON_INUSE, sizeof(void *));
if (bindex < istart || bindex > iend) {
PRINT_CALLER(fname, fxn, line);
printk(" CI5: dentry/linode=%p:%p bindex=%d "
"istart/end=%d:%d\n", dentry,
lower_inode, bindex, istart, iend);
- } else if (lower_inode == POISONED_PTR) {
+ } else if (lower_inode == poison_ptr) {
/* freed inode! */
PRINT_CALLER(fname, fxn, line);
printk(" CI6: dentry/linode=%p:%p bindex=%d "
diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
index a870e4e..d1db108 100644
--- a/fs/unionfs/union.h
+++ b/fs/unionfs/union.h
@@ -43,6 +43,7 @@
#include <linux/fs_stack.h>
#include <linux/magic.h>
#include <linux/log2.h>
+#include <linux/poison.h>
#include <asm/mman.h>
#include <asm/system.h>
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