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Subject[patch 29/52] fs: icache lock i_count
Protect inode->i_count with i_lock, rather than having it atomic.
Next step should also be to move things together (eg. the refcount increment
into d_instantiate, which will remove a lock/unlock cycle on i_lock).

Signed-off-by: Nick Piggin <npiggin@suse.de>
---
arch/powerpc/platforms/cell/spufs/file.c | 2 -
fs/affs/inode.c | 4 ++-
fs/afs/dir.c | 4 ++-
fs/anon_inodes.c | 4 ++-
fs/bfs/dir.c | 4 ++-
fs/block_dev.c | 15 ++++++++++--
fs/btrfs/inode.c | 4 ++-
fs/cifs/inode.c | 2 -
fs/coda/dir.c | 4 ++-
fs/exofs/inode.c | 12 +++++++---
fs/exofs/namei.c | 4 ++-
fs/ext2/namei.c | 4 ++-
fs/ext3/ialloc.c | 4 +--
fs/ext3/namei.c | 4 ++-
fs/ext4/ialloc.c | 4 +--
fs/ext4/namei.c | 4 ++-
fs/fs-writeback.c | 4 +--
fs/gfs2/ops_inode.c | 4 ++-
fs/hfsplus/dir.c | 4 ++-
fs/hpfs/inode.c | 2 -
fs/inode.c | 37 ++++++++++++++++++++-----------
fs/jffs2/dir.c | 8 +++++-
fs/jfs/jfs_txnmgr.c | 4 ++-
fs/jfs/namei.c | 4 ++-
fs/libfs.c | 4 ++-
fs/locks.c | 3 --
fs/minix/namei.c | 4 ++-
fs/namei.c | 7 ++++-
fs/nfs/dir.c | 4 ++-
fs/nfs/getroot.c | 4 ++-
fs/nfs/inode.c | 4 +--
fs/nilfs2/mdt.c | 2 -
fs/nilfs2/namei.c | 4 ++-
fs/notify/inode_mark.c | 22 +++++++++++-------
fs/notify/inotify/inotify.c | 28 +++++++++++++----------
fs/ntfs/super.c | 4 ++-
fs/ocfs2/namei.c | 4 ++-
fs/reiserfs/file.c | 4 +--
fs/reiserfs/namei.c | 4 ++-
fs/reiserfs/stree.c | 2 -
fs/sysv/namei.c | 4 ++-
fs/ubifs/dir.c | 4 ++-
fs/ubifs/super.c | 2 -
fs/udf/namei.c | 4 ++-
fs/ufs/namei.c | 4 ++-
fs/xfs/linux-2.6/xfs_iops.c | 4 ++-
fs/xfs/xfs_iget.c | 2 -
fs/xfs/xfs_inode.h | 6 +++--
include/linux/fs.h | 2 -
ipc/mqueue.c | 7 ++++-
kernel/futex.c | 4 ++-
mm/shmem.c | 4 ++-
52 files changed, 201 insertions(+), 96 deletions(-)

Index: linux-2.6/arch/powerpc/platforms/cell/spufs/file.c
===================================================================
--- linux-2.6.orig/arch/powerpc/platforms/cell/spufs/file.c
+++ linux-2.6/arch/powerpc/platforms/cell/spufs/file.c
@@ -1549,7 +1549,7 @@ static int spufs_mfc_open(struct inode *
if (ctx->owner != current->mm)
return -EINVAL;

- if (atomic_read(&inode->i_count) != 1)
+ if (inode->i_count != 1)
return -EBUSY;

mutex_lock(&ctx->mapping_lock);
Index: linux-2.6/fs/affs/inode.c
===================================================================
--- linux-2.6.orig/fs/affs/inode.c
+++ linux-2.6/fs/affs/inode.c
@@ -380,7 +380,9 @@ affs_add_entry(struct inode *dir, struct
affs_adjust_checksum(inode_bh, block - be32_to_cpu(chain));
mark_buffer_dirty_inode(inode_bh, inode);
inode->i_nlink = 2;
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
}
affs_fix_checksum(sb, bh);
mark_buffer_dirty_inode(bh, inode);
Index: linux-2.6/fs/afs/dir.c
===================================================================
--- linux-2.6.orig/fs/afs/dir.c
+++ linux-2.6/fs/afs/dir.c
@@ -1002,7 +1002,9 @@ static int afs_link(struct dentry *from,
if (ret < 0)
goto link_error;

- atomic_inc(&vnode->vfs_inode.i_count);
+ spin_lock(&vnode->vfs_inode.i_lock);
+ vnode->vfs_inode.i_count++;
+ spin_unlock(&vnode->vfs_inode.i_lock);
d_instantiate(dentry, &vnode->vfs_inode);
key_put(key);
_leave(" = 0");
Index: linux-2.6/fs/anon_inodes.c
===================================================================
--- linux-2.6.orig/fs/anon_inodes.c
+++ linux-2.6/fs/anon_inodes.c
@@ -114,7 +114,9 @@ struct file *anon_inode_getfile(const ch
* so we can avoid doing an igrab() and we can use an open-coded
* atomic_inc().
*/
- atomic_inc(&anon_inode_inode->i_count);
+ spin_lock(&anon_inode_inode->i_lock);
+ anon_inode_inode->i_count++;
+ spin_unlock(&anon_inode_inode->i_lock);

path.dentry->d_op = &anon_inodefs_dentry_operations;
d_instantiate(path.dentry, anon_inode_inode);
Index: linux-2.6/fs/block_dev.c
===================================================================
--- linux-2.6.orig/fs/block_dev.c
+++ linux-2.6/fs/block_dev.c
@@ -549,7 +549,12 @@ EXPORT_SYMBOL(bdget);
*/
struct block_device *bdgrab(struct block_device *bdev)
{
- atomic_inc(&bdev->bd_inode->i_count);
+ struct inode *inode = bdev->bd_inode;
+
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
+
return bdev;
}

@@ -579,7 +584,9 @@ static struct block_device *bd_acquire(s
spin_lock(&bdev_lock);
bdev = inode->i_bdev;
if (bdev) {
- atomic_inc(&bdev->bd_inode->i_count);
+ spin_lock(&inode->i_lock);
+ bdev->bd_inode->i_count++;
+ spin_unlock(&inode->i_lock);
spin_unlock(&bdev_lock);
return bdev;
}
@@ -595,7 +602,9 @@ static struct block_device *bd_acquire(s
* So, we can access it via ->i_mapping always
* without igrab().
*/
- atomic_inc(&bdev->bd_inode->i_count);
+ spin_lock(&inode->i_lock);
+ bdev->bd_inode->i_count++;
+ spin_unlock(&inode->i_lock);
inode->i_bdev = bdev;
inode->i_mapping = bdev->bd_inode->i_mapping;
list_add(&inode->i_devices, &bdev->bd_inodes);
Index: linux-2.6/fs/ext2/namei.c
===================================================================
--- linux-2.6.orig/fs/ext2/namei.c
+++ linux-2.6/fs/ext2/namei.c
@@ -206,7 +206,9 @@ static int ext2_link (struct dentry * ol

inode->i_ctime = CURRENT_TIME_SEC;
inode_inc_link_count(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

err = ext2_add_link(dentry, inode);
if (!err) {
Index: linux-2.6/fs/ext3/ialloc.c
===================================================================
--- linux-2.6.orig/fs/ext3/ialloc.c
+++ linux-2.6/fs/ext3/ialloc.c
@@ -100,9 +100,9 @@ void ext3_free_inode (handle_t *handle,
struct ext3_sb_info *sbi;
int fatal = 0, err;

- if (atomic_read(&inode->i_count) > 1) {
+ if (inode->i_count > 1) {
printk ("ext3_free_inode: inode has count=%d\n",
- atomic_read(&inode->i_count));
+ inode->i_count);
return;
}
if (inode->i_nlink) {
Index: linux-2.6/fs/ext3/namei.c
===================================================================
--- linux-2.6.orig/fs/ext3/namei.c
+++ linux-2.6/fs/ext3/namei.c
@@ -2261,7 +2261,9 @@ retry:

inode->i_ctime = CURRENT_TIME_SEC;
inc_nlink(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

err = ext3_add_entry(handle, dentry, inode);
if (!err) {
Index: linux-2.6/fs/fs-writeback.c
===================================================================
--- linux-2.6.orig/fs/fs-writeback.c
+++ linux-2.6/fs/fs-writeback.c
@@ -427,7 +427,7 @@ writeback_single_inode(struct inode *ino
unsigned dirty;
int ret;

- if (!atomic_read(&inode->i_count))
+ if (!inode->i_count)
WARN_ON(!(inode->i_state & (I_WILL_FREE|I_FREEING)));
else
WARN_ON(inode->i_state & I_WILL_FREE);
@@ -551,7 +551,7 @@ select_queue:
inode->i_state |= I_DIRTY_PAGES;
redirty_tail(inode);
}
- } else if (atomic_read(&inode->i_count)) {
+ } else if (inode->i_count) {
/*
* The inode is clean, inuse
*/
Index: linux-2.6/fs/inode.c
===================================================================
--- linux-2.6.orig/fs/inode.c
+++ linux-2.6/fs/inode.c
@@ -33,14 +33,13 @@
* inode_hash_lock protects:
* inode hash table, i_hash
* inode->i_lock protects:
- * i_state
+ * i_state, i_count
*
* Ordering:
* inode_lock
* sb_inode_list_lock
* inode->i_lock
- * inode_lock
- * inode_hash_lock
+ * inode_hash_lock
*/
/*
* This is needed for the following functions:
@@ -151,7 +150,7 @@ int inode_init_always(struct super_block
inode->i_sb = sb;
inode->i_blkbits = sb->s_blocksize_bits;
inode->i_flags = 0;
- atomic_set(&inode->i_count, 1);
+ inode->i_count = 1;
inode->i_op = &empty_iops;
inode->i_fop = &empty_fops;
inode->i_nlink = 1;
@@ -306,7 +305,8 @@ void __iget(struct inode *inode)
{
assert_spin_locked(&inode->i_lock);

- if (atomic_inc_return(&inode->i_count) != 1)
+ inode->i_count++;
+ if (inode->i_count > 1)
return;

if (!(inode->i_state & (I_DIRTY|I_SYNC)))
@@ -412,7 +412,7 @@ static int invalidate_list(struct list_h
continue;
}
invalidate_inode_buffers(inode);
- if (!atomic_read(&inode->i_count)) {
+ if (!inode->i_count) {
list_move(&inode->i_list, dispose);
WARN_ON(inode->i_state & I_NEW);
inode->i_state |= I_FREEING;
@@ -463,7 +463,7 @@ static int can_unuse(struct inode *inode
return 0;
if (inode_has_buffers(inode))
return 0;
- if (atomic_read(&inode->i_count))
+ if (inode->i_count)
return 0;
if (inode->i_data.nrpages)
return 0;
@@ -501,7 +501,7 @@ static void prune_icache(int nr_to_scan)
inode = list_entry(inode_unused.prev, struct inode, i_list);

spin_lock(&inode->i_lock);
- if (inode->i_state || atomic_read(&inode->i_count)) {
+ if (inode->i_state || inode->i_count) {
list_move(&inode->i_list, &inode_unused);
spin_unlock(&inode->i_lock);
continue;
@@ -1290,8 +1290,6 @@ void generic_delete_inode(struct inode *
{
const struct super_operations *op = inode->i_sb->s_op;

- spin_lock(&sb_inode_list_lock);
- spin_lock(&inode->i_lock);
list_del_init(&inode->i_list);
list_del_init(&inode->i_sb_list);
spin_unlock(&sb_inode_list_lock);
@@ -1336,8 +1334,6 @@ int generic_detach_inode(struct inode *i
{
struct super_block *sb = inode->i_sb;

- spin_lock(&sb_inode_list_lock);
- spin_lock(&inode->i_lock);
if (!hlist_unhashed(&inode->i_hash)) {
if (!(inode->i_state & (I_DIRTY|I_SYNC)))
list_move(&inode->i_list, &inode_unused);
@@ -1436,8 +1432,24 @@ void iput(struct inode *inode)
if (inode) {
BUG_ON(inode->i_state == I_CLEAR);

- if (atomic_dec_and_lock(&inode->i_count, &inode_lock))
+retry:
+ spin_lock(&inode->i_lock);
+ if (inode->i_count == 1) {
+ if (!spin_trylock(&inode_lock)) {
+ spin_unlock(&inode->i_lock);
+ goto retry;
+ }
+ if (!spin_trylock(&sb_inode_list_lock)) {
+ spin_unlock(&inode_lock);
+ spin_unlock(&inode->i_lock);
+ goto retry;
+ }
+ inode->i_count--;
iput_final(inode);
+ } else {
+ inode->i_count--;
+ spin_unlock(&inode->i_lock);
+ }
}
}
EXPORT_SYMBOL(iput);
Index: linux-2.6/fs/libfs.c
===================================================================
--- linux-2.6.orig/fs/libfs.c
+++ linux-2.6/fs/libfs.c
@@ -277,7 +277,9 @@ int simple_link(struct dentry *old_dentr

inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
inc_nlink(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
dget(dentry);
d_instantiate(dentry, inode);
return 0;
Index: linux-2.6/fs/locks.c
===================================================================
--- linux-2.6.orig/fs/locks.c
+++ linux-2.6/fs/locks.c
@@ -1375,8 +1375,7 @@ int generic_setlease(struct file *filp,
if ((arg == F_RDLCK) && (atomic_read(&inode->i_writecount) > 0))
goto out;
if ((arg == F_WRLCK)
- && (dentry->d_count > 1
- || (atomic_read(&inode->i_count) > 1)))
+ && (dentry->d_count > 1 || inode->i_count > 1))
goto out;
}

Index: linux-2.6/fs/namei.c
===================================================================
--- linux-2.6.orig/fs/namei.c
+++ linux-2.6/fs/namei.c
@@ -2306,8 +2306,11 @@ static long do_unlinkat(int dfd, const c
if (nd.last.name[nd.last.len])
goto slashes;
inode = dentry->d_inode;
- if (inode)
- atomic_inc(&inode->i_count);
+ if (inode) {
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
+ }
error = mnt_want_write(nd.path.mnt);
if (error)
goto exit2;
Index: linux-2.6/fs/nfs/dir.c
===================================================================
--- linux-2.6.orig/fs/nfs/dir.c
+++ linux-2.6/fs/nfs/dir.c
@@ -1570,7 +1570,9 @@ nfs_link(struct dentry *old_dentry, stru
d_drop(dentry);
error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
if (error == 0) {
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_add(dentry, inode);
}
return error;
Index: linux-2.6/fs/nfs/getroot.c
===================================================================
--- linux-2.6.orig/fs/nfs/getroot.c
+++ linux-2.6/fs/nfs/getroot.c
@@ -55,7 +55,9 @@ static int nfs_superblock_set_dummy_root
return -ENOMEM;
}
/* Circumvent igrab(): we know the inode is not being freed */
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
/*
* Ensure that this dentry is invisible to d_find_alias().
* Otherwise, it may be spliced into the tree by
Index: linux-2.6/fs/notify/inotify/inotify.c
===================================================================
--- linux-2.6.orig/fs/notify/inotify/inotify.c
+++ linux-2.6/fs/notify/inotify/inotify.c
@@ -404,23 +404,28 @@ void inotify_unmount_inodes(struct list_
* evict all inodes with zero i_count from icache which is
* unnecessarily violent and may in fact be illegal to do.
*/
- if (!atomic_read(&inode->i_count))
+ if (!inode->i_count)
continue;

need_iput_tmp = need_iput;
need_iput = NULL;
/* In case inotify_remove_watch_locked() drops a reference. */
- if (inode != need_iput_tmp)
+ if (inode != need_iput_tmp) {
+ spin_lock(&inode->i_lock);
__iget(inode);
- else
+ spin_unlock(&inode->i_lock);
+ } else
need_iput_tmp = NULL;
/* In case the dropping of a reference would nuke next_i. */
- if ((&next_i->i_sb_list != list) &&
- atomic_read(&next_i->i_count) &&
- !(next_i->i_state & (I_CLEAR | I_FREEING |
- I_WILL_FREE))) {
- __iget(next_i);
- need_iput = next_i;
+ if (&next_i->i_sb_list != list) {
+ spin_lock(&next_i->i_lock);
+ if (next_i->i_count &&
+ !(next_i->i_state &
+ (I_CLEAR|I_FREEING|I_WILL_FREE))) {
+ __iget(next_i);
+ need_iput = next_i;
+ }
+ spin_unlock(&next_i->i_lock);
}

/*
@@ -439,11 +444,10 @@ void inotify_unmount_inodes(struct list_
mutex_lock(&inode->inotify_mutex);
watches = &inode->inotify_watches;
list_for_each_entry_safe(watch, next_w, watches, i_list) {
- struct inotify_handle *ih= watch->ih;
+ struct inotify_handle *ih = watch->ih;
get_inotify_watch(watch);
mutex_lock(&ih->mutex);
- ih->in_ops->handle_event(watch, watch->wd, IN_UNMOUNT, 0,
- NULL, NULL);
+ ih->in_ops->handle_event(watch, watch->wd, IN_UNMOUNT, 0, NULL, NULL);
inotify_remove_watch_locked(ih, watch);
mutex_unlock(&ih->mutex);
put_inotify_watch(watch);
Index: linux-2.6/fs/xfs/linux-2.6/xfs_iops.c
===================================================================
--- linux-2.6.orig/fs/xfs/linux-2.6/xfs_iops.c
+++ linux-2.6/fs/xfs/linux-2.6/xfs_iops.c
@@ -360,7 +360,9 @@ xfs_vn_link(
if (unlikely(error))
return -error;

- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_instantiate(dentry, inode);
return 0;
}
Index: linux-2.6/fs/xfs/xfs_inode.h
===================================================================
--- linux-2.6.orig/fs/xfs/xfs_inode.h
+++ linux-2.6/fs/xfs/xfs_inode.h
@@ -483,8 +483,10 @@ void xfs_mark_inode_dirty_sync(xfs_inod

#define IHOLD(ip) \
do { \
- ASSERT(atomic_read(&VFS_I(ip)->i_count) > 0) ; \
- atomic_inc(&(VFS_I(ip)->i_count)); \
+ spin_lock(&VFS_I(ip)->i_lock); \
+ ASSERT(VFS_I(ip)->i_count > 0) ; \
+ VFS_I(ip)->i_count++; \
+ spin_unlock(&VFS_I(ip)->i_lock); \
trace_xfs_ihold(ip, _THIS_IP_); \
} while (0)

Index: linux-2.6/include/linux/fs.h
===================================================================
--- linux-2.6.orig/include/linux/fs.h
+++ linux-2.6/include/linux/fs.h
@@ -729,7 +729,7 @@ struct inode {
struct list_head i_sb_list;
struct list_head i_dentry;
unsigned long i_ino;
- atomic_t i_count;
+ unsigned int i_count;
unsigned int i_nlink;
uid_t i_uid;
gid_t i_gid;
Index: linux-2.6/ipc/mqueue.c
===================================================================
--- linux-2.6.orig/ipc/mqueue.c
+++ linux-2.6/ipc/mqueue.c
@@ -769,8 +769,11 @@ SYSCALL_DEFINE1(mq_unlink, const char __
}

inode = dentry->d_inode;
- if (inode)
- atomic_inc(&inode->i_count);
+ if (inode) {
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
+ }
err = mnt_want_write(ipc_ns->mq_mnt);
if (err)
goto out_err;
Index: linux-2.6/kernel/futex.c
===================================================================
--- linux-2.6.orig/kernel/futex.c
+++ linux-2.6/kernel/futex.c
@@ -168,7 +168,9 @@ static void get_futex_key_refs(union fut

switch (key->both.offset & (FUT_OFF_INODE|FUT_OFF_MMSHARED)) {
case FUT_OFF_INODE:
- atomic_inc(&key->shared.inode->i_count);
+ spin_lock(&key->shared.inode->i_lock);
+ key->shared.inode->i_count++;
+ spin_unlock(&key->shared.inode->i_lock);
break;
case FUT_OFF_MMSHARED:
atomic_inc(&key->private.mm->mm_count);
Index: linux-2.6/mm/shmem.c
===================================================================
--- linux-2.6.orig/mm/shmem.c
+++ linux-2.6/mm/shmem.c
@@ -1877,7 +1877,9 @@ static int shmem_link(struct dentry *old
dir->i_size += BOGO_DIRENT_SIZE;
inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
inc_nlink(inode);
- atomic_inc(&inode->i_count); /* New dentry reference */
+ spin_lock(&inode->i_lock);
+ inode->i_count++; /* New dentry reference */
+ spin_unlock(&inode->i_lock);
dget(dentry); /* Extra pinning count for the created dentry */
d_instantiate(dentry, inode);
out:
Index: linux-2.6/fs/bfs/dir.c
===================================================================
--- linux-2.6.orig/fs/bfs/dir.c
+++ linux-2.6/fs/bfs/dir.c
@@ -176,7 +176,9 @@ static int bfs_link(struct dentry *old,
inc_nlink(inode);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_instantiate(new, inode);
mutex_unlock(&info->bfs_lock);
return 0;
Index: linux-2.6/fs/btrfs/inode.c
===================================================================
--- linux-2.6.orig/fs/btrfs/inode.c
+++ linux-2.6/fs/btrfs/inode.c
@@ -4753,7 +4753,9 @@ static int btrfs_link(struct dentry *old
}

btrfs_set_trans_block_group(trans, dir);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

err = btrfs_add_nondir(trans, dentry, inode, 1, index);

Index: linux-2.6/fs/coda/dir.c
===================================================================
--- linux-2.6.orig/fs/coda/dir.c
+++ linux-2.6/fs/coda/dir.c
@@ -303,7 +303,9 @@ static int coda_link(struct dentry *sour
}

coda_dir_update_mtime(dir_inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_instantiate(de, inode);
inc_nlink(inode);

Index: linux-2.6/fs/exofs/inode.c
===================================================================
--- linux-2.6.orig/fs/exofs/inode.c
+++ linux-2.6/fs/exofs/inode.c
@@ -1124,7 +1124,9 @@ static void create_done(struct exofs_io_

set_obj_created(oi);

- atomic_dec(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count--;
+ spin_unlock(&inode->i_lock);
wake_up(&oi->i_wq);
}

@@ -1177,14 +1179,18 @@ struct inode *exofs_new_inode(struct ino
/* increment the refcount so that the inode will still be around when we
* reach the callback
*/
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

ios->done = create_done;
ios->private = inode;
ios->cred = oi->i_cred;
ret = exofs_sbi_create(ios);
if (ret) {
- atomic_dec(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count--;
+ spin_unlock(&inode->i_lock);
exofs_put_io_state(ios);
return ERR_PTR(ret);
}
Index: linux-2.6/fs/exofs/namei.c
===================================================================
--- linux-2.6.orig/fs/exofs/namei.c
+++ linux-2.6/fs/exofs/namei.c
@@ -153,7 +153,9 @@ static int exofs_link(struct dentry *old

inode->i_ctime = CURRENT_TIME;
inode_inc_link_count(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

return exofs_add_nondir(dentry, inode);
}
Index: linux-2.6/fs/ext4/ialloc.c
===================================================================
--- linux-2.6.orig/fs/ext4/ialloc.c
+++ linux-2.6/fs/ext4/ialloc.c
@@ -189,9 +189,9 @@ void ext4_free_inode(handle_t *handle, s
struct ext4_sb_info *sbi;
int fatal = 0, err, count, cleared;

- if (atomic_read(&inode->i_count) > 1) {
+ if (inode->i_count > 1) {
printk(KERN_ERR "ext4_free_inode: inode has count=%d\n",
- atomic_read(&inode->i_count));
+ inode->i_count);
return;
}
if (inode->i_nlink) {
Index: linux-2.6/fs/ext4/namei.c
===================================================================
--- linux-2.6.orig/fs/ext4/namei.c
+++ linux-2.6/fs/ext4/namei.c
@@ -2340,7 +2340,9 @@ retry:

inode->i_ctime = ext4_current_time(inode);
ext4_inc_count(handle, inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

err = ext4_add_entry(handle, dentry, inode);
if (!err) {
Index: linux-2.6/fs/gfs2/ops_inode.c
===================================================================
--- linux-2.6.orig/fs/gfs2/ops_inode.c
+++ linux-2.6/fs/gfs2/ops_inode.c
@@ -253,7 +253,9 @@ out_parent:
gfs2_holder_uninit(ghs);
gfs2_holder_uninit(ghs + 1);
if (!error) {
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_instantiate(dentry, inode);
mark_inode_dirty(inode);
}
Index: linux-2.6/fs/hfsplus/dir.c
===================================================================
--- linux-2.6.orig/fs/hfsplus/dir.c
+++ linux-2.6/fs/hfsplus/dir.c
@@ -301,7 +301,9 @@ static int hfsplus_link(struct dentry *s

inc_nlink(inode);
hfsplus_instantiate(dst_dentry, inode, cnid);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
inode->i_ctime = CURRENT_TIME_SEC;
mark_inode_dirty(inode);
HFSPLUS_SB(sb).file_count++;
Index: linux-2.6/fs/hpfs/inode.c
===================================================================
--- linux-2.6.orig/fs/hpfs/inode.c
+++ linux-2.6/fs/hpfs/inode.c
@@ -183,7 +183,7 @@ void hpfs_write_inode(struct inode *i)
struct hpfs_inode_info *hpfs_inode = hpfs_i(i);
struct inode *parent;
if (i->i_ino == hpfs_sb(i->i_sb)->sb_root) return;
- if (hpfs_inode->i_rddir_off && !atomic_read(&i->i_count)) {
+ if (hpfs_inode->i_rddir_off && !i->i_count) {
if (*hpfs_inode->i_rddir_off) printk("HPFS: write_inode: some position still there\n");
kfree(hpfs_inode->i_rddir_off);
hpfs_inode->i_rddir_off = NULL;
Index: linux-2.6/fs/jffs2/dir.c
===================================================================
--- linux-2.6.orig/fs/jffs2/dir.c
+++ linux-2.6/fs/jffs2/dir.c
@@ -290,7 +290,9 @@ static int jffs2_link (struct dentry *ol
mutex_unlock(&f->sem);
d_instantiate(dentry, old_dentry->d_inode);
dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
- atomic_inc(&old_dentry->d_inode->i_count);
+ spin_lock(&old_dentry->d_inode->i_lock);
+ old_dentry->d_inode->i_count++;
+ spin_unlock(&old_dentry->d_inode->i_lock);
}
return ret;
}
@@ -871,7 +873,9 @@ static int jffs2_rename (struct inode *o
printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
/* Might as well let the VFS know */
d_instantiate(new_dentry, old_dentry->d_inode);
- atomic_inc(&old_dentry->d_inode->i_count);
+ spin_lock(&old_dentry->d_inode->i_lock);
+ old_dentry->d_inode->i_count++;
+ spin_unlock(&old_dentry->d_inode->i_lock);
new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
return ret;
}
Index: linux-2.6/fs/jfs/jfs_txnmgr.c
===================================================================
--- linux-2.6.orig/fs/jfs/jfs_txnmgr.c
+++ linux-2.6/fs/jfs/jfs_txnmgr.c
@@ -1279,7 +1279,9 @@ int txCommit(tid_t tid, /* transaction
* lazy commit thread finishes processing
*/
if (tblk->xflag & COMMIT_DELETE) {
- atomic_inc(&tblk->u.ip->i_count);
+ spin_lock(&tblk->u.ip->i_lock);
+ tblk->u.ip->i_count++;
+ spin_unlock(&tblk->u.ip->i_lock);
/*
* Avoid a rare deadlock
*
Index: linux-2.6/fs/jfs/namei.c
===================================================================
--- linux-2.6.orig/fs/jfs/namei.c
+++ linux-2.6/fs/jfs/namei.c
@@ -839,7 +839,9 @@ static int jfs_link(struct dentry *old_d
ip->i_ctime = CURRENT_TIME;
dir->i_ctime = dir->i_mtime = CURRENT_TIME;
mark_inode_dirty(dir);
- atomic_inc(&ip->i_count);
+ spin_lock(&ip->i_lock);
+ ip->i_count++;
+ spin_unlock(&ip->i_lock);

iplist[0] = ip;
iplist[1] = dir;
Index: linux-2.6/fs/minix/namei.c
===================================================================
--- linux-2.6.orig/fs/minix/namei.c
+++ linux-2.6/fs/minix/namei.c
@@ -101,7 +101,9 @@ static int minix_link(struct dentry * ol

inode->i_ctime = CURRENT_TIME_SEC;
inode_inc_link_count(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
return add_nondir(dentry, inode);
}

Index: linux-2.6/fs/nfs/inode.c
===================================================================
--- linux-2.6.orig/fs/nfs/inode.c
+++ linux-2.6/fs/nfs/inode.c
@@ -377,7 +377,7 @@ nfs_fhget(struct super_block *sb, struct
dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
inode->i_sb->s_id,
(long long)NFS_FILEID(inode),
- atomic_read(&inode->i_count));
+ inode->i_count);

out:
return inode;
@@ -1123,7 +1123,7 @@ static int nfs_update_inode(struct inode

dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
__func__, inode->i_sb->s_id, inode->i_ino,
- atomic_read(&inode->i_count), fattr->valid);
+ inode->i_count, fattr->valid);

if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
goto out_fileid;
Index: linux-2.6/fs/nilfs2/mdt.c
===================================================================
--- linux-2.6.orig/fs/nilfs2/mdt.c
+++ linux-2.6/fs/nilfs2/mdt.c
@@ -479,7 +479,7 @@ nilfs_mdt_new_common(struct the_nilfs *n
inode->i_sb = sb; /* sb may be NULL for some meta data files */
inode->i_blkbits = nilfs->ns_blocksize_bits;
inode->i_flags = 0;
- atomic_set(&inode->i_count, 1);
+ inode->i_count = 1;
inode->i_nlink = 1;
inode->i_ino = ino;
inode->i_mode = S_IFREG;
Index: linux-2.6/fs/nilfs2/namei.c
===================================================================
--- linux-2.6.orig/fs/nilfs2/namei.c
+++ linux-2.6/fs/nilfs2/namei.c
@@ -219,7 +219,9 @@ static int nilfs_link(struct dentry *old

inode->i_ctime = CURRENT_TIME;
inode_inc_link_count(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

err = nilfs_add_nondir(dentry, inode);
if (!err)
Index: linux-2.6/fs/ocfs2/namei.c
===================================================================
--- linux-2.6.orig/fs/ocfs2/namei.c
+++ linux-2.6/fs/ocfs2/namei.c
@@ -722,7 +722,9 @@ static int ocfs2_link(struct dentry *old
goto out_commit;
}

- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
dentry->d_op = &ocfs2_dentry_ops;
d_instantiate(dentry, inode);

Index: linux-2.6/fs/reiserfs/file.c
===================================================================
--- linux-2.6.orig/fs/reiserfs/file.c
+++ linux-2.6/fs/reiserfs/file.c
@@ -39,7 +39,7 @@ static int reiserfs_file_release(struct
BUG_ON(!S_ISREG(inode->i_mode));

/* fast out for when nothing needs to be done */
- if ((atomic_read(&inode->i_count) > 1 ||
+ if ((inode->i_count > 1 ||
!(REISERFS_I(inode)->i_flags & i_pack_on_close_mask) ||
!tail_has_to_be_packed(inode)) &&
REISERFS_I(inode)->i_prealloc_count <= 0) {
@@ -94,7 +94,7 @@ static int reiserfs_file_release(struct
if (!err)
err = jbegin_failure;

- if (!err && atomic_read(&inode->i_count) <= 1 &&
+ if (!err && inode->i_count <= 1 &&
(REISERFS_I(inode)->i_flags & i_pack_on_close_mask) &&
tail_has_to_be_packed(inode)) {
/* if regular file is released by last holder and it has been
Index: linux-2.6/fs/reiserfs/namei.c
===================================================================
--- linux-2.6.orig/fs/reiserfs/namei.c
+++ linux-2.6/fs/reiserfs/namei.c
@@ -1156,7 +1156,9 @@ static int reiserfs_link(struct dentry *
inode->i_ctime = CURRENT_TIME_SEC;
reiserfs_update_sd(&th, inode);

- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_instantiate(dentry, inode);
retval = journal_end(&th, dir->i_sb, jbegin_count);
reiserfs_write_unlock(dir->i_sb);
Index: linux-2.6/fs/reiserfs/stree.c
===================================================================
--- linux-2.6.orig/fs/reiserfs/stree.c
+++ linux-2.6/fs/reiserfs/stree.c
@@ -1477,7 +1477,7 @@ static int maybe_indirect_to_direct(stru
** reading in the last block. The user will hit problems trying to
** read the file, but for now we just skip the indirect2direct
*/
- if (atomic_read(&inode->i_count) > 1 ||
+ if (inode->i_count > 1 ||
!tail_has_to_be_packed(inode) ||
!page || (REISERFS_I(inode)->i_flags & i_nopack_mask)) {
/* leave tail in an unformatted node */
Index: linux-2.6/fs/sysv/namei.c
===================================================================
--- linux-2.6.orig/fs/sysv/namei.c
+++ linux-2.6/fs/sysv/namei.c
@@ -126,7 +126,9 @@ static int sysv_link(struct dentry * old

inode->i_ctime = CURRENT_TIME_SEC;
inode_inc_link_count(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

return add_nondir(dentry, inode);
}
Index: linux-2.6/fs/ubifs/dir.c
===================================================================
--- linux-2.6.orig/fs/ubifs/dir.c
+++ linux-2.6/fs/ubifs/dir.c
@@ -550,7 +550,9 @@ static int ubifs_link(struct dentry *old

lock_2_inodes(dir, inode);
inc_nlink(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
inode->i_ctime = ubifs_current_time(inode);
dir->i_size += sz_change;
dir_ui->ui_size = dir->i_size;
Index: linux-2.6/fs/ubifs/super.c
===================================================================
--- linux-2.6.orig/fs/ubifs/super.c
+++ linux-2.6/fs/ubifs/super.c
@@ -342,7 +342,7 @@ static void ubifs_delete_inode(struct in
goto out;

dbg_gen("inode %lu, mode %#x", inode->i_ino, (int)inode->i_mode);
- ubifs_assert(!atomic_read(&inode->i_count));
+ ubifs_assert(!inode->i_count);
ubifs_assert(inode->i_nlink == 0);

truncate_inode_pages(&inode->i_data, 0);
Index: linux-2.6/fs/udf/namei.c
===================================================================
--- linux-2.6.orig/fs/udf/namei.c
+++ linux-2.6/fs/udf/namei.c
@@ -1101,7 +1101,9 @@ static int udf_link(struct dentry *old_d
inc_nlink(inode);
inode->i_ctime = current_fs_time(inode->i_sb);
mark_inode_dirty(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);
d_instantiate(dentry, inode);
unlock_kernel();

Index: linux-2.6/fs/ufs/namei.c
===================================================================
--- linux-2.6.orig/fs/ufs/namei.c
+++ linux-2.6/fs/ufs/namei.c
@@ -180,7 +180,9 @@ static int ufs_link (struct dentry * old

inode->i_ctime = CURRENT_TIME_SEC;
inode_inc_link_count(inode);
- atomic_inc(&inode->i_count);
+ spin_lock(&inode->i_lock);
+ inode->i_count++;
+ spin_unlock(&inode->i_lock);

error = ufs_add_nondir(dentry, inode);
unlock_kernel();
Index: linux-2.6/fs/notify/inode_mark.c
===================================================================
--- linux-2.6.orig/fs/notify/inode_mark.c
+++ linux-2.6/fs/notify/inode_mark.c
@@ -382,24 +382,30 @@ void fsnotify_unmount_inodes(struct list
* evict all inodes with zero i_count from icache which is
* unnecessarily violent and may in fact be illegal to do.
*/
- if (!atomic_read(&inode->i_count))
+ if (!inode->i_count)
continue;

need_iput_tmp = need_iput;
need_iput = NULL;

/* In case fsnotify_inode_delete() drops a reference. */
- if (inode != need_iput_tmp)
+ if (inode != need_iput_tmp) {
+ spin_lock(&inode->i_lock);
__iget(inode);
- else
+ spin_unlock(&inode->i_lock);
+ } else
need_iput_tmp = NULL;

/* In case the dropping of a reference would nuke next_i. */
- if ((&next_i->i_sb_list != list) &&
- atomic_read(&next_i->i_count) &&
- !(next_i->i_state & (I_CLEAR | I_FREEING | I_WILL_FREE))) {
- __iget(next_i);
- need_iput = next_i;
+ if (&next_i->i_sb_list != list) {
+ spin_lock(&next_i->i_lock);
+ if (next_i->i_count &&
+ !(next_i->i_state &
+ (I_CLEAR | I_FREEING | I_WILL_FREE))) {
+ __iget(next_i);
+ need_iput = next_i;
+ }
+ spin_unlock(&next_i->i_lock);
}

/*
Index: linux-2.6/fs/ntfs/super.c
===================================================================
--- linux-2.6.orig/fs/ntfs/super.c
+++ linux-2.6/fs/ntfs/super.c
@@ -2930,7 +2930,9 @@ static int ntfs_fill_super(struct super_
}
if ((sb->s_root = d_alloc_root(vol->root_ino))) {
/* We increment i_count simulating an ntfs_iget(). */
- atomic_inc(&vol->root_ino->i_count);
+ spin_lock(&vol->root_ino->i_lock);
+ vol->root_ino->i_count++;
+ spin_unlock(&vol->root_ino->i_lock);
ntfs_debug("Exiting, status successful.");
/* Release the default upcase if it has no users. */
mutex_lock(&ntfs_lock);
Index: linux-2.6/fs/cifs/inode.c
===================================================================
--- linux-2.6.orig/fs/cifs/inode.c
+++ linux-2.6/fs/cifs/inode.c
@@ -1612,7 +1612,7 @@ int cifs_revalidate_dentry(struct dentry
}

cFYI(1, "Revalidate: %s inode 0x%p count %d dentry: 0x%p d_time %ld "
- "jiffies %ld", full_path, inode, inode->i_count.counter,
+ "jiffies %ld", full_path, inode, inode->i_count,
dentry, dentry->d_time, jiffies);

if (CIFS_SB(sb)->tcon->unix_ext)
Index: linux-2.6/fs/xfs/linux-2.6/xfs_trace.h
===================================================================
--- linux-2.6.orig/fs/xfs/linux-2.6/xfs_trace.h
+++ linux-2.6/fs/xfs/linux-2.6/xfs_trace.h
@@ -576,7 +576,7 @@ DECLARE_EVENT_CLASS(xfs_inode_class,
TP_fast_assign(
__entry->dev = VFS_I(ip)->i_sb->s_dev;
__entry->ino = ip->i_ino;
- __entry->count = atomic_read(&VFS_I(ip)->i_count);
+ __entry->count = VFS_I(ip)->i_count;
__entry->pincount = atomic_read(&ip->i_pincount);
__entry->caller_ip = caller_ip;
),
Index: linux-2.6/net/socket.c
===================================================================
--- linux-2.6.orig/net/socket.c
+++ linux-2.6/net/socket.c
@@ -386,7 +386,9 @@ static int sock_alloc_file(struct socket
&socket_file_ops);
if (unlikely(!file)) {
/* drop dentry, keep inode */
- atomic_inc(&path.dentry->d_inode->i_count);
+ spin_lock(&path.dentry->d_inode->i_lock);
+ path.dentry->d_inode->i_count++;
+ spin_unlock(&path.dentry->d_inode->i_lock);
path_put(&path);
put_unused_fd(fd);
return -ENFILE;



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