From: Richard Kennedy on
Using atomic_inc_return in __iget(struct inode *inode) makes the intent
of this code clearer and generates less code on processors that have
this operation.

On x86_64 this patch reduces the text size of inode.o by 12 bytes.

Signed-off-by: Richard Kennedy <richard(a)>

patch against 2.6.34-rc7
compiled & tested on x86_64 AMD X2

I've been running with this patch applied for several weeks with no
obvious problems.

diff --git a/fs/inode.c b/fs/inode.c
index 407bf39..b405028 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -286,11 +286,9 @@ static void init_once(void *foo)
void __iget(struct inode *inode)
- if (atomic_read(&inode->i_count)) {
- atomic_inc(&inode->i_count);
+ if (atomic_inc_return(&inode->i_count) != 1)
- }
- atomic_inc(&inode->i_count);
if (!(inode->i_state & (I_DIRTY|I_SYNC)))
list_move(&inode->i_list, &inode_in_use);

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