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Subject[patch 17/35] fs: icache RCU free inodes
RCU free the struct inode. This will allow:

- Subsequent store-free path walking patch. The inode must be consulted for
permissions when walking, so an RCU inode reference is a must.
- sb_inode_list_lock to be moved inside i_lock because sb list walkers who want
to take i_lock no longer need to take sb_inode_list_lock to walk the list in
the first place. This will simplify and optimize locking.
- Could remove some nested trylock loops in dcache code
- Could potentially simplify things a bit in VM land. Do not need to take the
page lock to follow page->mapping.

The downsides of this is the performance cost of using RCU. In a simple
creat/unlink microbenchmark, performance drops by about 10% due to inability to
reuse cache-hot slab objects. As iterations increase and RCU freeing starts
kicking over, this increases to about 20%.

In cases where inode lifetimes are longer (ie. many inodes may be allocated
during the average life span of a single inode), a lot of this cache reuse is
not applicable, so the regression caused by this patch is smaller.

The cache-hot regression could largely be avoided by using SLAB_DESTROY_BY_RCU,
however this adds some complexity to list walking and store-free path walking,
so I prefer to implement this at a later date, if it is shown to be a win in
real situations. I haven't found a regression in any non-micro benchmark so I
doubt it will be a problem.

Signed-off-by: Nick Piggin <npiggin@kernel.dk>

---
Documentation/filesystems/porting | 4
arch/powerpc/platforms/cell/spufs/inode.c | 10 +-
drivers/staging/pohmelfs/inode.c | 11 ++
fs/9p/vfs_inode.c | 9 +-
fs/adfs/super.c | 9 +-
fs/affs/super.c | 9 +-
fs/afs/super.c | 10 ++
fs/befs/linuxvfs.c | 10 +-
fs/bfs/inode.c | 9 +-
fs/block_dev.c | 9 +-
fs/btrfs/inode.c | 9 +-
fs/ceph/inode.c | 11 ++
fs/cifs/cifsfs.c | 9 +-
fs/coda/inode.c | 9 +-
fs/ecryptfs/super.c | 12 ++
fs/efs/super.c | 9 +-
fs/exofs/super.c | 9 +-
fs/ext2/super.c | 9 +-
fs/ext3/super.c | 9 +-
fs/ext4/super.c | 9 +-
fs/fat/inode.c | 9 +-
fs/freevxfs/vxfs_inode.c | 9 +-
fs/fuse/inode.c | 9 +-
fs/gfs2/super.c | 9 +-
fs/hfs/super.c | 9 +-
fs/hfsplus/super.c | 9 +-
fs/hostfs/hostfs_kern.c | 9 +-
fs/hpfs/super.c | 9 +-
fs/hppfs/hppfs.c | 9 +-
fs/hugetlbfs/inode.c | 9 +-
fs/inode.c | 129 +++++++++++++++---------------
fs/isofs/inode.c | 9 +-
fs/jffs2/super.c | 9 +-
fs/jfs/super.c | 10 ++
fs/logfs/inode.c | 9 +-
fs/minix/inode.c | 9 +-
fs/ncpfs/inode.c | 9 +-
fs/nfs/inode.c | 9 +-
fs/nilfs2/super.c | 9 +-
fs/ntfs/inode.c | 9 +-
fs/ocfs2/dlmfs/dlmfs.c | 9 +-
fs/ocfs2/super.c | 9 +-
fs/openpromfs/inode.c | 9 +-
fs/proc/inode.c | 9 +-
fs/qnx4/inode.c | 9 +-
fs/reiserfs/super.c | 9 +-
fs/romfs/super.c | 9 +-
fs/smbfs/inode.c | 9 +-
fs/squashfs/super.c | 9 +-
fs/sysv/inode.c | 9 +-
fs/ubifs/super.c | 10 ++
fs/udf/super.c | 9 +-
fs/ufs/super.c | 9 +-
fs/xfs/xfs_iget.c | 13 ++-
include/linux/fs.h | 7 +
include/linux/net.h | 1
ipc/mqueue.c | 9 +-
mm/shmem.c | 9 +-
net/socket.c | 16 +--
net/sunrpc/rpc_pipe.c | 10 ++
60 files changed, 539 insertions(+), 130 deletions(-)
Index: linux-2.6/fs/ext2/super.c
===================================================================
--- linux-2.6.orig/fs/ext2/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/ext2/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -161,11 +161,18 @@
return &ei->vfs_inode;
}

-static void ext2_destroy_inode(struct inode *inode)
+static void ext2_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(ext2_inode_cachep, EXT2_I(inode));
}

+static void ext2_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, ext2_i_callback);
+}
+
static void init_once(void *foo)
{
struct ext2_inode_info *ei = (struct ext2_inode_info *) foo;
Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c 2010-10-19 14:18:59.000000000 +1100
+++ linux-2.6/fs/inode.c 2010-10-19 14:19:26.000000000 +1100
@@ -278,13 +278,20 @@
}
EXPORT_SYMBOL(__destroy_inode);

+static void i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(inode_cachep, inode);
+}
+
void destroy_inode(struct inode *inode)
{
__destroy_inode(inode);
if (inode->i_sb->s_op->destroy_inode)
inode->i_sb->s_op->destroy_inode(inode);
else
- kmem_cache_free(inode_cachep, (inode));
+ call_rcu(&inode->i_rcu, i_callback);
}

/*
@@ -328,6 +335,7 @@
BUG_ON(!(inode->i_state & I_FREEING));
BUG_ON(inode->i_state & I_CLEAR);
inode_sync_wait(inode);
+ /* don't need i_lock here, no concurrent mods to i_state */
inode->i_state = I_FREEING | I_CLEAR;
}
EXPORT_SYMBOL(end_writeback);
@@ -691,7 +699,7 @@
spin_unlock(&sb_inode_list_lock);
if (b) {
spin_lock_bucket(b);
- hlist_bl_add_head(&inode->i_hash, &b->head);
+ hlist_bl_add_head_rcu(&inode->i_hash, &b->head);
spin_unlock_bucket(b);
}
}
@@ -1190,42 +1198,41 @@
struct super_block *sb = inode->i_sb;
ino_t ino = inode->i_ino;
struct inode_hash_bucket *b = inode_hashtable + hash(sb, ino);
+ struct hlist_bl_node *node;
+ struct inode *old;

inode->i_state |= I_NEW;
- while (1) {
- struct hlist_bl_node *node;
- struct inode *old = NULL;

repeat:
- spin_lock_bucket(b);
- hlist_bl_for_each_entry(old, node, &b->head, i_hash) {
- if (old->i_ino != ino)
- continue;
- if (old->i_sb != sb)
- continue;
- if (old->i_state & (I_FREEING|I_WILL_FREE))
- continue;
- if (!spin_trylock(&old->i_lock)) {
- spin_unlock_bucket(b);
- goto repeat;
- }
- break;
- }
- if (likely(!node)) {
- hlist_bl_add_head(&inode->i_hash, &b->head);
+ spin_lock_bucket(b);
+ hlist_bl_for_each_entry(old, node, &b->head, i_hash) {
+ if (old->i_ino != ino)
+ continue;
+ if (old->i_sb != sb)
+ continue;
+ if (old->i_state & (I_FREEING|I_WILL_FREE))
+ continue;
+ if (!spin_trylock(&old->i_lock)) {
spin_unlock_bucket(b);
- return 0;
- }
- spin_unlock_bucket(b);
- __iget(old);
- spin_unlock(&old->i_lock);
- wait_on_inode(old);
- if (unlikely(!hlist_bl_unhashed(&old->i_hash))) {
- iput(old);
- return -EBUSY;
+ goto repeat;
}
+ goto found_old;
+ }
+ hlist_bl_add_head_rcu(&inode->i_hash, &b->head);
+ spin_unlock_bucket(b);
+ return 0;
+
+found_old:
+ spin_unlock_bucket(b);
+ __iget(old);
+ spin_unlock(&old->i_lock);
+ wait_on_inode(old);
+ if (unlikely(!hlist_bl_unhashed(&old->i_hash))) {
iput(old);
+ return -EBUSY;
}
+ iput(old);
+ goto repeat;
}
EXPORT_SYMBOL(insert_inode_locked);

@@ -1234,43 +1241,43 @@
{
struct super_block *sb = inode->i_sb;
struct inode_hash_bucket *b = inode_hashtable + hash(sb, hashval);
+ struct hlist_bl_node *node;
+ struct inode *old;

inode->i_state |= I_NEW;

- while (1) {
- struct hlist_bl_node *node;
- struct inode *old = NULL;
-
repeat:
- spin_lock_bucket(b);
- hlist_bl_for_each_entry(old, node, &b->head, i_hash) {
- if (old->i_sb != sb)
- continue;
- if (!test(old, data))
- continue;
- if (old->i_state & (I_FREEING|I_WILL_FREE))
- continue;
- if (!spin_trylock(&old->i_lock)) {
- spin_unlock_bucket(b);
- goto repeat;
- }
- break;
- }
- if (likely(!node)) {
- hlist_bl_add_head(&inode->i_hash, &b->head);
+ spin_lock_bucket(b);
+ hlist_bl_for_each_entry(old, node, &b->head, i_hash) {
+ if (old->i_sb != sb)
+ continue;
+ /* XXX: audit put test outside i_lock? */
+ if (!test(old, data))
+ continue;
+ if (old->i_state & (I_FREEING|I_WILL_FREE))
+ continue;
+ if (!spin_trylock(&old->i_lock)) {
spin_unlock_bucket(b);
- return 0;
- }
- spin_unlock_bucket(b);
- __iget(old);
- spin_unlock(&old->i_lock);
- wait_on_inode(old);
- if (unlikely(!hlist_bl_unhashed(&old->i_hash))) {
- iput(old);
- return -EBUSY;
+ cpu_relax();
+ goto repeat;
}
+ goto found_old;
+ }
+ hlist_bl_add_head_rcu(&inode->i_hash, &b->head);
+ spin_unlock_bucket(b);
+ return 0;
+
+found_old:
+ spin_unlock_bucket(b);
+ __iget(old);
+ spin_unlock(&old->i_lock);
+ wait_on_inode(old);
+ if (unlikely(!hlist_bl_unhashed(&old->i_hash))) {
iput(old);
+ return -EBUSY;
}
+ iput(old);
+ goto repeat;
}
EXPORT_SYMBOL(insert_inode_locked4);

@@ -1288,7 +1295,7 @@

spin_lock(&inode->i_lock);
spin_lock_bucket(b);
- hlist_bl_add_head(&inode->i_hash, &b->head);
+ hlist_bl_add_head_rcu(&inode->i_hash, &b->head);
spin_unlock_bucket(b);
spin_unlock(&inode->i_lock);
}
@@ -1305,7 +1312,7 @@
{
struct inode_hash_bucket *b = inode_hashtable + hash(inode->i_sb, inode->i_ino);
spin_lock_bucket(b);
- hlist_bl_del_init(&inode->i_hash);
+ hlist_bl_del_init_rcu(&inode->i_hash);
spin_unlock_bucket(b);
}

Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h 2010-10-19 14:18:59.000000000 +1100
+++ linux-2.6/include/linux/fs.h 2010-10-19 14:19:26.000000000 +1100
@@ -380,7 +380,7 @@
#include <linux/cache.h>
#include <linux/kobject.h>
#include <linux/list.h>
-#include <linux/list_bl.h>
+#include <linux/rculist_bl.h>
#include <linux/radix-tree.h>
#include <linux/prio_tree.h>
#include <linux/init.h>
@@ -732,7 +732,10 @@
struct hlist_bl_node i_hash;
struct list_head i_list; /* backing dev IO list */
struct list_head i_sb_list;
- struct list_head i_dentry;
+ union {
+ struct list_head i_dentry;
+ struct rcu_head i_rcu;
+ };
unsigned long i_ino;
unsigned int i_count;
unsigned int i_nlink;
Index: linux-2.6/fs/block_dev.c
===================================================================
--- linux-2.6.orig/fs/block_dev.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/fs/block_dev.c 2010-10-19 14:19:18.000000000 +1100
@@ -395,13 +395,20 @@
return &ei->vfs_inode;
}

-static void bdev_destroy_inode(struct inode *inode)
+static void bdev_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
struct bdev_inode *bdi = BDEV_I(inode);

+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(bdev_cachep, bdi);
}

+static void bdev_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, bdev_i_callback);
+}
+
static void init_once(void *foo)
{
struct bdev_inode *ei = (struct bdev_inode *) foo;
Index: linux-2.6/fs/ext3/super.c
===================================================================
--- linux-2.6.orig/fs/ext3/super.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/ext3/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -485,6 +485,13 @@
return &ei->vfs_inode;
}

+static void ext3_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
+}
+
static void ext3_destroy_inode(struct inode *inode)
{
if (!list_empty(&(EXT3_I(inode)->i_orphan))) {
@@ -495,7 +502,7 @@
false);
dump_stack();
}
- kmem_cache_free(ext3_inode_cachep, EXT3_I(inode));
+ call_rcu(&inode->i_rcu, ext3_i_callback);
}

static void init_once(void *foo)
Index: linux-2.6/fs/hugetlbfs/inode.c
===================================================================
--- linux-2.6.orig/fs/hugetlbfs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/hugetlbfs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -648,11 +648,18 @@
return &p->vfs_inode;
}

+static void hugetlbfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
+}
+
static void hugetlbfs_destroy_inode(struct inode *inode)
{
hugetlbfs_inc_free_inodes(HUGETLBFS_SB(inode->i_sb));
mpol_free_shared_policy(&HUGETLBFS_I(inode)->policy);
- kmem_cache_free(hugetlbfs_inode_cachep, HUGETLBFS_I(inode));
+ call_rcu(&inode->i_rcu, hugetlbfs_i_callback);
}

static const struct address_space_operations hugetlbfs_aops = {
Index: linux-2.6/fs/proc/inode.c
===================================================================
--- linux-2.6.orig/fs/proc/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/proc/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -66,11 +66,18 @@
return inode;
}

-static void proc_destroy_inode(struct inode *inode)
+static void proc_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(proc_inode_cachep, PROC_I(inode));
}

+static void proc_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, proc_i_callback);
+}
+
static void init_once(void *foo)
{
struct proc_inode *ei = (struct proc_inode *) foo;
Index: linux-2.6/ipc/mqueue.c
===================================================================
--- linux-2.6.orig/ipc/mqueue.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/ipc/mqueue.c 2010-10-19 14:19:18.000000000 +1100
@@ -236,11 +236,18 @@
return &ei->vfs_inode;
}

-static void mqueue_destroy_inode(struct inode *inode)
+static void mqueue_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(mqueue_inode_cachep, MQUEUE_I(inode));
}

+static void mqueue_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, mqueue_i_callback);
+}
+
static void mqueue_evict_inode(struct inode *inode)
{
struct mqueue_inode_info *info;
Index: linux-2.6/net/socket.c
===================================================================
--- linux-2.6.orig/net/socket.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/net/socket.c 2010-10-19 14:19:26.000000000 +1100
@@ -262,20 +262,20 @@
}


-static void wq_free_rcu(struct rcu_head *head)
+static void sock_free_rcu(struct rcu_head *head)
{
- struct socket_wq *wq = container_of(head, struct socket_wq, rcu);
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct socket_alloc *ei = container_of(inode, struct socket_alloc,
+ vfs_inode);

- kfree(wq);
+ kfree(ei->socket.wq);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(sock_inode_cachep, ei);
}

static void sock_destroy_inode(struct inode *inode)
{
- struct socket_alloc *ei;
-
- ei = container_of(inode, struct socket_alloc, vfs_inode);
- call_rcu(&ei->socket.wq->rcu, wq_free_rcu);
- kmem_cache_free(sock_inode_cachep, ei);
+ call_rcu(&inode->i_rcu, sock_free_rcu);
}

static void init_once(void *foo)
Index: linux-2.6/fs/fat/inode.c
===================================================================
--- linux-2.6.orig/fs/fat/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/fat/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -519,11 +519,18 @@
return &ei->vfs_inode;
}

-static void fat_destroy_inode(struct inode *inode)
+static void fat_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(fat_inode_cachep, MSDOS_I(inode));
}

+static void fat_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, fat_i_callback);
+}
+
static void init_once(void *foo)
{
struct msdos_inode_info *ei = (struct msdos_inode_info *)foo;
Index: linux-2.6/fs/nfs/inode.c
===================================================================
--- linux-2.6.orig/fs/nfs/inode.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/fs/nfs/inode.c 2010-10-19 14:19:16.000000000 +1100
@@ -1434,11 +1434,18 @@
return &nfsi->vfs_inode;
}

-void nfs_destroy_inode(struct inode *inode)
+static void nfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
}

+void nfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, nfs_i_callback);
+}
+
static inline void nfs4_init_once(struct nfs_inode *nfsi)
{
#ifdef CONFIG_NFS_V4
Index: linux-2.6/mm/shmem.c
===================================================================
--- linux-2.6.orig/mm/shmem.c 2010-10-19 14:18:59.000000000 +1100
+++ linux-2.6/mm/shmem.c 2010-10-19 14:19:18.000000000 +1100
@@ -2416,13 +2416,20 @@
return &p->vfs_inode;
}

+static void shmem_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
+}
+
static void shmem_destroy_inode(struct inode *inode)
{
if ((inode->i_mode & S_IFMT) == S_IFREG) {
/* only struct inode is valid if it's an inline symlink */
mpol_free_shared_policy(&SHMEM_I(inode)->policy);
}
- kmem_cache_free(shmem_inode_cachep, SHMEM_I(inode));
+ call_rcu(&inode->i_rcu, shmem_i_callback);
}

static void init_once(void *foo)
Index: linux-2.6/net/sunrpc/rpc_pipe.c
===================================================================
--- linux-2.6.orig/net/sunrpc/rpc_pipe.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/net/sunrpc/rpc_pipe.c 2010-10-19 14:18:59.000000000 +1100
@@ -163,11 +163,19 @@
}

static void
-rpc_destroy_inode(struct inode *inode)
+rpc_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(rpc_inode_cachep, RPC_I(inode));
}

+static void
+rpc_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, rpc_i_callback);
+}
+
static int
rpc_pipe_open(struct inode *inode, struct file *filp)
{
Index: linux-2.6/include/linux/net.h
===================================================================
--- linux-2.6.orig/include/linux/net.h 2010-10-19 14:17:19.000000000 +1100
+++ linux-2.6/include/linux/net.h 2010-10-19 14:19:26.000000000 +1100
@@ -120,7 +120,6 @@
struct socket_wq {
wait_queue_head_t wait;
struct fasync_struct *fasync_list;
- struct rcu_head rcu;
} ____cacheline_aligned_in_smp;

/**
Index: linux-2.6/fs/9p/vfs_inode.c
===================================================================
--- linux-2.6.orig/fs/9p/vfs_inode.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/fs/9p/vfs_inode.c 2010-10-19 14:19:18.000000000 +1100
@@ -231,10 +231,17 @@
*
*/

-void v9fs_destroy_inode(struct inode *inode)
+static void v9fs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(vcookie_cache, v9fs_inode2cookie(inode));
}
+
+void v9fs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, v9fs_i_callback);
+}
#endif

/**
Index: linux-2.6/fs/adfs/super.c
===================================================================
--- linux-2.6.orig/fs/adfs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/adfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -240,11 +240,18 @@
return &ei->vfs_inode;
}

-static void adfs_destroy_inode(struct inode *inode)
+static void adfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(adfs_inode_cachep, ADFS_I(inode));
}

+static void adfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, adfs_i_callback);
+}
+
static void init_once(void *foo)
{
struct adfs_inode_info *ei = (struct adfs_inode_info *) foo;
Index: linux-2.6/fs/affs/super.c
===================================================================
--- linux-2.6.orig/fs/affs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/affs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -100,11 +100,18 @@
return &i->vfs_inode;
}

-static void affs_destroy_inode(struct inode *inode)
+static void affs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(affs_inode_cachep, AFFS_I(inode));
}

+static void affs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, affs_i_callback);
+}
+
static void init_once(void *foo)
{
struct affs_inode_info *ei = (struct affs_inode_info *) foo;
Index: linux-2.6/fs/afs/super.c
===================================================================
--- linux-2.6.orig/fs/afs/super.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/afs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -508,6 +508,14 @@
return &vnode->vfs_inode;
}

+static void afs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct afs_vnode *vnode = AFS_FS_I(inode);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(afs_inode_cachep, vnode);
+}
+
/*
* destroy an AFS inode struct
*/
@@ -521,7 +529,7 @@

ASSERTCMP(vnode->server, ==, NULL);

- kmem_cache_free(afs_inode_cachep, vnode);
+ call_rcu(&inode->i_rcu, afs_i_callback);
atomic_dec(&afs_count_active_inodes);
}

Index: linux-2.6/fs/befs/linuxvfs.c
===================================================================
--- linux-2.6.orig/fs/befs/linuxvfs.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/befs/linuxvfs.c 2010-10-19 14:18:59.000000000 +1100
@@ -284,12 +284,18 @@
return &bi->vfs_inode;
}

-static void
-befs_destroy_inode(struct inode *inode)
+static void befs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(befs_inode_cachep, BEFS_I(inode));
}

+static void befs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, befs_i_callback);
+}
+
static void init_once(void *foo)
{
struct befs_inode_info *bi = (struct befs_inode_info *) foo;
Index: linux-2.6/fs/bfs/inode.c
===================================================================
--- linux-2.6.orig/fs/bfs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/bfs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -253,11 +253,18 @@
return &bi->vfs_inode;
}

-static void bfs_destroy_inode(struct inode *inode)
+static void bfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(bfs_inode_cachep, BFS_I(inode));
}

+static void bfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, bfs_i_callback);
+}
+
static void init_once(void *foo)
{
struct bfs_inode_info *bi = foo;
Index: linux-2.6/fs/btrfs/inode.c
===================================================================
--- linux-2.6.orig/fs/btrfs/inode.c 2010-10-19 14:18:59.000000000 +1100
+++ linux-2.6/fs/btrfs/inode.c 2010-10-19 14:19:18.000000000 +1100
@@ -6286,6 +6286,13 @@
return inode;
}

+static void btrfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
+}
+
void btrfs_destroy_inode(struct inode *inode)
{
struct btrfs_ordered_extent *ordered;
@@ -6340,7 +6347,7 @@
inode_tree_del(inode);
btrfs_drop_extent_cache(inode, 0, (u64)-1, 0);
free:
- kmem_cache_free(btrfs_inode_cachep, BTRFS_I(inode));
+ call_rcu(&inode->i_rcu, btrfs_i_callback);
}

int btrfs_drop_inode(struct inode *inode)
Index: linux-2.6/fs/ceph/inode.c
===================================================================
--- linux-2.6.orig/fs/ceph/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/ceph/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -368,6 +368,15 @@
return &ci->vfs_inode;
}

+static void ceph_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct ceph_inode_info *ci = ceph_inode(inode);
+
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(ceph_inode_cachep, ci);
+}
+
void ceph_destroy_inode(struct inode *inode)
{
struct ceph_inode_info *ci = ceph_inode(inode);
@@ -407,7 +416,7 @@
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);

- kmem_cache_free(ceph_inode_cachep, ci);
+ call_rcu(&inode->i_rcu, ceph_i_callback);
}


Index: linux-2.6/fs/cifs/cifsfs.c
===================================================================
--- linux-2.6.orig/fs/cifs/cifsfs.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/cifs/cifsfs.c 2010-10-19 14:18:59.000000000 +1100
@@ -322,10 +322,17 @@
return &cifs_inode->vfs_inode;
}

+static void cifs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
+}
+
static void
cifs_destroy_inode(struct inode *inode)
{
- kmem_cache_free(cifs_inode_cachep, CIFS_I(inode));
+ call_rcu(&inode->i_rcu, cifs_i_callback);
}

static void
Index: linux-2.6/fs/coda/inode.c
===================================================================
--- linux-2.6.orig/fs/coda/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/coda/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -54,11 +54,18 @@
return &ei->vfs_inode;
}

-static void coda_destroy_inode(struct inode *inode)
+static void coda_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(coda_inode_cachep, ITOC(inode));
}

+static void coda_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, coda_i_callback);
+}
+
static void init_once(void *foo)
{
struct coda_inode_info *ei = (struct coda_inode_info *) foo;
Index: linux-2.6/fs/ecryptfs/super.c
===================================================================
--- linux-2.6.orig/fs/ecryptfs/super.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/ecryptfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -63,6 +63,16 @@
return inode;
}

+static void ecryptfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct ecryptfs_inode_info *inode_info;
+ inode_info = ecryptfs_inode_to_private(inode);
+
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
+}
+
/**
* ecryptfs_destroy_inode
* @inode: The ecryptfs inode
@@ -89,7 +99,7 @@
}
}
ecryptfs_destroy_crypt_stat(&inode_info->crypt_stat);
- kmem_cache_free(ecryptfs_inode_info_cache, inode_info);
+ call_rcu(&inode->i_rcu, ecryptfs_i_callback);
}

/**
Index: linux-2.6/fs/efs/super.c
===================================================================
--- linux-2.6.orig/fs/efs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/efs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -65,11 +65,18 @@
return &ei->vfs_inode;
}

-static void efs_destroy_inode(struct inode *inode)
+static void efs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(efs_inode_cachep, INODE_INFO(inode));
}

+static void efs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, efs_i_callback);
+}
+
static void init_once(void *foo)
{
struct efs_inode_info *ei = (struct efs_inode_info *) foo;
Index: linux-2.6/fs/exofs/super.c
===================================================================
--- linux-2.6.orig/fs/exofs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/exofs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -150,12 +150,19 @@
return &oi->vfs_inode;
}

+static void exofs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
+}
+
/*
* Remove an inode from the cache
*/
static void exofs_destroy_inode(struct inode *inode)
{
- kmem_cache_free(exofs_inode_cachep, exofs_i(inode));
+ call_rcu(&inode->i_rcu, exofs_i_callback);
}

/*
Index: linux-2.6/fs/ext4/super.c
===================================================================
--- linux-2.6.orig/fs/ext4/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/ext4/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -825,6 +825,13 @@
return &ei->vfs_inode;
}

+static void ext4_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
+}
+
static void ext4_destroy_inode(struct inode *inode)
{
if (!list_empty(&(EXT4_I(inode)->i_orphan))) {
@@ -836,7 +843,7 @@
true);
dump_stack();
}
- kmem_cache_free(ext4_inode_cachep, EXT4_I(inode));
+ call_rcu(&inode->i_rcu, ext4_i_callback);
}

static void init_once(void *foo)
Index: linux-2.6/fs/freevxfs/vxfs_inode.c
===================================================================
--- linux-2.6.orig/fs/freevxfs/vxfs_inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/freevxfs/vxfs_inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -336,6 +336,13 @@
return ip;
}

+static void vxfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(vxfs_inode_cachep, inode->i_private);
+}
+
/**
* vxfs_evict_inode - remove inode from main memory
* @ip: inode to discard.
@@ -349,5 +356,5 @@
{
truncate_inode_pages(&ip->i_data, 0);
end_writeback(ip);
- kmem_cache_free(vxfs_inode_cachep, ip->i_private);
+ call_rcu(&ip->i_rcu, vxfs_i_callback);
}
Index: linux-2.6/fs/fuse/inode.c
===================================================================
--- linux-2.6.orig/fs/fuse/inode.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/fuse/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -99,6 +99,13 @@
return inode;
}

+static void fuse_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(fuse_inode_cachep, inode);
+}
+
static void fuse_destroy_inode(struct inode *inode)
{
struct fuse_inode *fi = get_fuse_inode(inode);
@@ -106,7 +113,7 @@
BUG_ON(!list_empty(&fi->queued_writes));
if (fi->forget_req)
fuse_request_free(fi->forget_req);
- kmem_cache_free(fuse_inode_cachep, inode);
+ call_rcu(&inode->i_rcu, fuse_i_callback);
}

void fuse_send_forget(struct fuse_conn *fc, struct fuse_req *req,
Index: linux-2.6/fs/gfs2/super.c
===================================================================
--- linux-2.6.orig/fs/gfs2/super.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/gfs2/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -1414,11 +1414,18 @@
return &ip->i_inode;
}

-static void gfs2_destroy_inode(struct inode *inode)
+static void gfs2_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(gfs2_inode_cachep, inode);
}

+static void gfs2_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, gfs2_i_callback);
+}
+
const struct super_operations gfs2_super_ops = {
.alloc_inode = gfs2_alloc_inode,
.destroy_inode = gfs2_destroy_inode,
Index: linux-2.6/fs/hfs/super.c
===================================================================
--- linux-2.6.orig/fs/hfs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/hfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -172,11 +172,18 @@
return i ? &i->vfs_inode : NULL;
}

-static void hfs_destroy_inode(struct inode *inode)
+static void hfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(hfs_inode_cachep, HFS_I(inode));
}

+static void hfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hfs_i_callback);
+}
+
static const struct super_operations hfs_super_operations = {
.alloc_inode = hfs_alloc_inode,
.destroy_inode = hfs_destroy_inode,
Index: linux-2.6/fs/hfsplus/super.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/hfsplus/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -484,11 +484,18 @@
return i ? &i->vfs_inode : NULL;
}

-static void hfsplus_destroy_inode(struct inode *inode)
+static void hfsplus_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(hfsplus_inode_cachep, &HFSPLUS_I(inode));
}

+static void hfsplus_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hfsplus_i_callback);
+}
+
#define HFSPLUS_INODE_SIZE sizeof(struct hfsplus_inode_info)

static int hfsplus_get_sb(struct file_system_type *fs_type,
Index: linux-2.6/fs/hpfs/super.c
===================================================================
--- linux-2.6.orig/fs/hpfs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/hpfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -177,11 +177,18 @@
return &ei->vfs_inode;
}

-static void hpfs_destroy_inode(struct inode *inode)
+static void hpfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
}

+static void hpfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hpfs_i_callback);
+}
+
static void init_once(void *foo)
{
struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
Index: linux-2.6/fs/isofs/inode.c
===================================================================
--- linux-2.6.orig/fs/isofs/inode.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/isofs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -70,11 +70,18 @@
return &ei->vfs_inode;
}

-static void isofs_destroy_inode(struct inode *inode)
+static void isofs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
}

+static void isofs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, isofs_i_callback);
+}
+
static void init_once(void *foo)
{
struct iso_inode_info *ei = foo;
Index: linux-2.6/fs/jffs2/super.c
===================================================================
--- linux-2.6.orig/fs/jffs2/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/jffs2/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -41,11 +41,18 @@
return &f->vfs_inode;
}

-static void jffs2_destroy_inode(struct inode *inode)
+static void jffs2_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode));
}

+static void jffs2_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, jffs2_i_callback);
+}
+
static void jffs2_i_init_once(void *foo)
{
struct jffs2_inode_info *f = foo;
Index: linux-2.6/fs/jfs/super.c
===================================================================
--- linux-2.6.orig/fs/jfs/super.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/jfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -116,6 +116,14 @@
return &jfs_inode->vfs_inode;
}

+static void jfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct jfs_inode_info *ji = JFS_IP(inode);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(jfs_inode_cachep, ji);
+}
+
static void jfs_destroy_inode(struct inode *inode)
{
struct jfs_inode_info *ji = JFS_IP(inode);
@@ -129,7 +137,7 @@
ji->active_ag = -1;
}
spin_unlock_irq(&ji->ag_lock);
- kmem_cache_free(jfs_inode_cachep, ji);
+ call_rcu(&inode->i_rcu, jfs_i_callback);
}

static int jfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Index: linux-2.6/fs/logfs/inode.c
===================================================================
--- linux-2.6.orig/fs/logfs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/logfs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -141,13 +141,20 @@
return __logfs_iget(sb, ino);
}

+static void logfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(logfs_inode_cache, logfs_inode(inode));
+}
+
static void __logfs_destroy_inode(struct inode *inode)
{
struct logfs_inode *li = logfs_inode(inode);

BUG_ON(li->li_block);
list_del(&li->li_freeing_list);
- kmem_cache_free(logfs_inode_cache, li);
+ call_rcu(&inode->i_rcu, logfs_i_callback);
}

static void logfs_destroy_inode(struct inode *inode)
Index: linux-2.6/fs/minix/inode.c
===================================================================
--- linux-2.6.orig/fs/minix/inode.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/minix/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -68,11 +68,18 @@
return &ei->vfs_inode;
}

-static void minix_destroy_inode(struct inode *inode)
+static void minix_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(minix_inode_cachep, minix_i(inode));
}

+static void minix_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, minix_i_callback);
+}
+
static void init_once(void *foo)
{
struct minix_inode_info *ei = (struct minix_inode_info *) foo;
Index: linux-2.6/fs/ncpfs/inode.c
===================================================================
--- linux-2.6.orig/fs/ncpfs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/ncpfs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -59,11 +59,18 @@
return &ei->vfs_inode;
}

-static void ncp_destroy_inode(struct inode *inode)
+static void ncp_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(ncp_inode_cachep, NCP_FINFO(inode));
}

+static void ncp_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, ncp_i_callback);
+}
+
static void init_once(void *foo)
{
struct ncp_inode_info *ei = (struct ncp_inode_info *) foo;
Index: linux-2.6/fs/nilfs2/super.c
===================================================================
--- linux-2.6.orig/fs/nilfs2/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/nilfs2/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -166,11 +166,18 @@
return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
}

-void nilfs_destroy_inode(struct inode *inode)
+static void nilfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
}

+void nilfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, nilfs_i_callback);
+}
+
static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
Index: linux-2.6/fs/ntfs/inode.c
===================================================================
--- linux-2.6.orig/fs/ntfs/inode.c 2010-10-19 14:18:59.000000000 +1100
+++ linux-2.6/fs/ntfs/inode.c 2010-10-19 14:19:16.000000000 +1100
@@ -332,6 +332,13 @@
return NULL;
}

+static void ntfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode));
+}
+
void ntfs_destroy_big_inode(struct inode *inode)
{
ntfs_inode *ni = NTFS_I(inode);
@@ -340,7 +347,7 @@
BUG_ON(ni->page);
if (!atomic_dec_and_test(&ni->count))
BUG();
- kmem_cache_free(ntfs_big_inode_cache, NTFS_I(inode));
+ call_rcu(&inode->i_rcu, ntfs_i_callback);
}

static inline ntfs_inode *ntfs_alloc_extent_inode(void)
Index: linux-2.6/fs/ocfs2/dlmfs/dlmfs.c
===================================================================
--- linux-2.6.orig/fs/ocfs2/dlmfs/dlmfs.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/ocfs2/dlmfs/dlmfs.c 2010-10-19 14:18:59.000000000 +1100
@@ -351,11 +351,18 @@
return &ip->ip_vfs_inode;
}

-static void dlmfs_destroy_inode(struct inode *inode)
+static void dlmfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(dlmfs_inode_cache, DLMFS_I(inode));
}

+static void dlmfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, dlmfs_i_callback);
+}
+
static void dlmfs_evict_inode(struct inode *inode)
{
int status;
Index: linux-2.6/fs/ocfs2/super.c
===================================================================
--- linux-2.6.orig/fs/ocfs2/super.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/ocfs2/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -550,11 +550,18 @@
return &oi->vfs_inode;
}

-static void ocfs2_destroy_inode(struct inode *inode)
+static void ocfs2_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(ocfs2_inode_cachep, OCFS2_I(inode));
}

+static void ocfs2_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, ocfs2_i_callback);
+}
+
static unsigned long long ocfs2_max_file_offset(unsigned int bbits,
unsigned int cbits)
{
Index: linux-2.6/fs/openpromfs/inode.c
===================================================================
--- linux-2.6.orig/fs/openpromfs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/openpromfs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -343,11 +343,18 @@
return &oi->vfs_inode;
}

-static void openprom_destroy_inode(struct inode *inode)
+static void openprom_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(op_inode_cachep, OP_I(inode));
}

+static void openprom_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, openprom_i_callback);
+}
+
static struct inode *openprom_iget(struct super_block *sb, ino_t ino)
{
struct inode *inode;
Index: linux-2.6/fs/qnx4/inode.c
===================================================================
--- linux-2.6.orig/fs/qnx4/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/qnx4/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -431,11 +431,18 @@
return &ei->vfs_inode;
}

-static void qnx4_destroy_inode(struct inode *inode)
+static void qnx4_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(qnx4_inode_cachep, qnx4_i(inode));
}

+static void qnx4_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, qnx4_i_callback);
+}
+
static void init_once(void *foo)
{
struct qnx4_inode_info *ei = (struct qnx4_inode_info *) foo;
Index: linux-2.6/fs/reiserfs/super.c
===================================================================
--- linux-2.6.orig/fs/reiserfs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/reiserfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -530,11 +530,18 @@
return &ei->vfs_inode;
}

-static void reiserfs_destroy_inode(struct inode *inode)
+static void reiserfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(reiserfs_inode_cachep, REISERFS_I(inode));
}

+static void reiserfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, reiserfs_i_callback);
+}
+
static void init_once(void *foo)
{
struct reiserfs_inode_info *ei = (struct reiserfs_inode_info *)foo;
Index: linux-2.6/fs/romfs/super.c
===================================================================
--- linux-2.6.orig/fs/romfs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/romfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -399,11 +399,18 @@
/*
* return a spent inode to the slab cache
*/
-static void romfs_destroy_inode(struct inode *inode)
+static void romfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(romfs_inode_cachep, ROMFS_I(inode));
}

+static void romfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, romfs_i_callback);
+}
+
/*
* get filesystem statistics
*/
Index: linux-2.6/fs/smbfs/inode.c
===================================================================
--- linux-2.6.orig/fs/smbfs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/smbfs/inode.c 2010-10-19 14:19:16.000000000 +1100
@@ -62,11 +62,18 @@
return &ei->vfs_inode;
}

-static void smb_destroy_inode(struct inode *inode)
+static void smb_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(smb_inode_cachep, SMB_I(inode));
}

+static void smb_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, smb_i_callback);
+}
+
static void init_once(void *foo)
{
struct smb_inode_info *ei = (struct smb_inode_info *) foo;
Index: linux-2.6/fs/squashfs/super.c
===================================================================
--- linux-2.6.orig/fs/squashfs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/squashfs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -447,11 +447,18 @@
}


-static void squashfs_destroy_inode(struct inode *inode)
+static void squashfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(squashfs_inode_cachep, squashfs_i(inode));
}

+static void squashfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, squashfs_i_callback);
+}
+

static struct file_system_type squashfs_fs_type = {
.owner = THIS_MODULE,
Index: linux-2.6/fs/sysv/inode.c
===================================================================
--- linux-2.6.orig/fs/sysv/inode.c 2010-10-19 14:17:21.000000000 +1100
+++ linux-2.6/fs/sysv/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -333,11 +333,18 @@
return &si->vfs_inode;
}

-static void sysv_destroy_inode(struct inode *inode)
+static void sysv_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(sysv_inode_cachep, SYSV_I(inode));
}

+static void sysv_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, sysv_i_callback);
+}
+
static void init_once(void *p)
{
struct sysv_inode_info *si = (struct sysv_inode_info *)p;
Index: linux-2.6/fs/ubifs/super.c
===================================================================
--- linux-2.6.orig/fs/ubifs/super.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/fs/ubifs/super.c 2010-10-19 14:19:16.000000000 +1100
@@ -272,12 +272,20 @@
return &ui->vfs_inode;
};

+static void ubifs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct ubifs_inode *ui = ubifs_inode(inode);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(ubifs_inode_slab, ui);
+}
+
static void ubifs_destroy_inode(struct inode *inode)
{
struct ubifs_inode *ui = ubifs_inode(inode);

kfree(ui->data);
- kmem_cache_free(ubifs_inode_slab, inode);
+ call_rcu(&inode->i_rcu, ubifs_i_callback);
}

/*
Index: linux-2.6/fs/udf/super.c
===================================================================
--- linux-2.6.orig/fs/udf/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/udf/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -140,11 +140,18 @@
return &ei->vfs_inode;
}

-static void udf_destroy_inode(struct inode *inode)
+static void udf_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(udf_inode_cachep, UDF_I(inode));
}

+static void udf_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, udf_i_callback);
+}
+
static void init_once(void *foo)
{
struct udf_inode_info *ei = (struct udf_inode_info *)foo;
Index: linux-2.6/fs/ufs/super.c
===================================================================
--- linux-2.6.orig/fs/ufs/super.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/ufs/super.c 2010-10-19 14:18:59.000000000 +1100
@@ -1407,11 +1407,18 @@
return &ei->vfs_inode;
}

-static void ufs_destroy_inode(struct inode *inode)
+static void ufs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(ufs_inode_cachep, UFS_I(inode));
}

+static void ufs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, ufs_i_callback);
+}
+
static void init_once(void *foo)
{
struct ufs_inode_info *ei = (struct ufs_inode_info *) foo;
Index: linux-2.6/Documentation/filesystems/porting
===================================================================
--- linux-2.6.orig/Documentation/filesystems/porting 2010-10-19 14:18:59.000000000 +1100
+++ linux-2.6/Documentation/filesystems/porting 2010-10-19 14:18:59.000000000 +1100
@@ -326,3 +326,7 @@
particular things. Most of the time, a filesystem only needs ->i_lock, which
protects *all* the inode state and its membership on lists that was
previously protected with inode_lock.
+
+--
+[mandatory]
+ Filessystems must RCU-free their inodes. Lots of examples.
Index: linux-2.6/arch/powerpc/platforms/cell/spufs/inode.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/inode.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/inode.c 2010-10-19 14:18:59.000000000 +1100
@@ -71,12 +71,18 @@
return &ei->vfs_inode;
}

-static void
-spufs_destroy_inode(struct inode *inode)
+static void spufs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kmem_cache_free(spufs_inode_cache, SPUFS_I(inode));
}

+static void spufs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, spufs_i_callback);
+}
+
static void
spufs_init_once(void *p)
{
Index: linux-2.6/drivers/staging/pohmelfs/inode.c
===================================================================
--- linux-2.6.orig/drivers/staging/pohmelfs/inode.c 2010-10-19 14:18:58.000000000 +1100
+++ linux-2.6/drivers/staging/pohmelfs/inode.c 2010-10-19 14:19:16.000000000 +1100
@@ -826,6 +826,14 @@
.set_page_dirty = __set_page_dirty_nobuffers,
};

+static void pohmelfs_i_callback(struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_cache_free(pohmelfs_inode_cache, POHMELFS_I(inode));
+ atomic_long_dec(&psb->total_inodes);
+}
+
/*
* ->detroy_inode() callback. Deletes inode from the caches
* and frees private data.
@@ -842,8 +850,7 @@

dprintk("%s: pi: %p, inode: %p, ino: %llu.\n",
__func__, pi, &pi->vfs_inode, pi->ino);
- kmem_cache_free(pohmelfs_inode_cache, pi);
- atomic_long_dec(&psb->total_inodes);
+ call_rcu(&inode->i_rcu, pohmelfs_i_callback);
}

/*
Index: linux-2.6/fs/hostfs/hostfs_kern.c
===================================================================
--- linux-2.6.orig/fs/hostfs/hostfs_kern.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/hostfs/hostfs_kern.c 2010-10-19 14:18:59.000000000 +1100
@@ -251,11 +251,18 @@
}
}

-static void hostfs_destroy_inode(struct inode *inode)
+static void hostfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kfree(HOSTFS_I(inode));
}

+static void hostfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hostfs_i_callback);
+}
+
static int hostfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
{
const char *root_path = vfs->mnt_sb->s_fs_info;
Index: linux-2.6/fs/hppfs/hppfs.c
===================================================================
--- linux-2.6.orig/fs/hppfs/hppfs.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/hppfs/hppfs.c 2010-10-19 14:18:59.000000000 +1100
@@ -631,11 +631,18 @@
mntput(ino->i_sb->s_fs_info);
}

-static void hppfs_destroy_inode(struct inode *inode)
+static void hppfs_i_callback(struct rcu_head *head)
{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ INIT_LIST_HEAD(&inode->i_dentry);
kfree(HPPFS_I(inode));
}

+static void hppfs_destroy_inode(struct inode *inode)
+{
+ call_rcu(&inode->i_rcu, hppfs_i_callback);
+}
+
static const struct super_operations hppfs_sbops = {
.alloc_inode = hppfs_alloc_inode,
.destroy_inode = hppfs_destroy_inode,
Index: linux-2.6/fs/xfs/xfs_iget.c
===================================================================
--- linux-2.6.orig/fs/xfs/xfs_iget.c 2010-10-19 14:17:20.000000000 +1100
+++ linux-2.6/fs/xfs/xfs_iget.c 2010-10-19 14:18:59.000000000 +1100
@@ -91,6 +91,17 @@
return ip;
}

+STATIC void
+xfs_inode_free_callback(
+ struct rcu_head *head)
+{
+ struct inode *inode = container_of(head, struct inode, i_rcu);
+ struct xfs_inode *ip = XFS_I(inode);
+
+ INIT_LIST_HEAD(&inode->i_dentry);
+ kmem_zone_free(xfs_inode_zone, ip);
+}
+
void
xfs_inode_free(
struct xfs_inode *ip)
@@ -134,7 +145,7 @@
ASSERT(!spin_is_locked(&ip->i_flags_lock));
ASSERT(completion_done(&ip->i_flush));

- kmem_zone_free(xfs_inode_zone, ip);
+ call_rcu(&ip->i_vnode.i_rcu, xfs_inode_free_callback);
}

/*



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