Re: [PATCH 06/20] fs: Clean up inode reference counting
From: Christoph Hellwig
Date: Tue Oct 19 2010 - 15:38:31 EST
On Mon, Oct 18, 2010 at 05:20:42PM +1100, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
>
> Lots of filesystem code open codes the act of getting a reference to
> an inode. Factor the open coded inode lock, increment, unlock into
> a function iref(). This removes most direct external references to
> the inode reference count.
>
> Originally based on a patch from Nick Piggin.
>
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
> Reviewed-by: Christoph Hellwig <hch@xxxxxx>
> ---
> fs/9p/vfs_inode.c | 5 +++--
> fs/affs/inode.c | 2 +-
> fs/afs/dir.c | 2 +-
> fs/anon_inodes.c | 7 +------
> fs/bfs/dir.c | 2 +-
> fs/block_dev.c | 13 ++++++-------
> fs/btrfs/inode.c | 2 +-
> fs/coda/dir.c | 2 +-
> fs/drop_caches.c | 2 +-
> fs/exofs/inode.c | 2 +-
> fs/exofs/namei.c | 2 +-
> fs/ext2/namei.c | 2 +-
> fs/ext3/namei.c | 2 +-
> fs/ext4/namei.c | 2 +-
> fs/fs-writeback.c | 7 +++----
> fs/gfs2/ops_inode.c | 2 +-
> fs/hfsplus/dir.c | 2 +-
> fs/inode.c | 34 ++++++++++++++++++++++------------
> fs/jffs2/dir.c | 4 ++--
> fs/jfs/jfs_txnmgr.c | 2 +-
> fs/jfs/namei.c | 2 +-
> fs/libfs.c | 2 +-
> fs/logfs/dir.c | 2 +-
> fs/minix/namei.c | 2 +-
> fs/namei.c | 2 +-
> fs/nfs/dir.c | 2 +-
> fs/nfs/getroot.c | 2 +-
> fs/nfs/write.c | 2 +-
> fs/nilfs2/namei.c | 2 +-
> fs/notify/inode_mark.c | 8 ++++----
> fs/ntfs/super.c | 4 ++--
> fs/ocfs2/namei.c | 2 +-
> fs/quota/dquot.c | 2 +-
> fs/reiserfs/namei.c | 2 +-
> fs/sysv/namei.c | 2 +-
> fs/ubifs/dir.c | 2 +-
> fs/udf/namei.c | 2 +-
> fs/ufs/namei.c | 2 +-
> fs/xfs/linux-2.6/xfs_iops.c | 2 +-
> fs/xfs/xfs_inode.h | 2 +-
> include/linux/fs.h | 2 +-
> ipc/mqueue.c | 2 +-
> kernel/futex.c | 2 +-
> mm/shmem.c | 2 +-
> net/socket.c | 2 +-
> 45 files changed, 80 insertions(+), 76 deletions(-)
>
> diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
> index 9e670d5..1f76624 100644
> --- a/fs/9p/vfs_inode.c
> +++ b/fs/9p/vfs_inode.c
> @@ -1789,9 +1789,10 @@ v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
> kfree(st);
> } else {
> /* Caching disabled. No need to get upto date stat info.
> - * This dentry will be released immediately. So, just i_count++
> + * This dentry will be released immediately. So, just take
> + * a reference.
> */
> - atomic_inc(&old_dentry->d_inode->i_count);
> + iref(old_dentry->d_inode);
> }
>
> dentry->d_op = old_dentry->d_op;
> diff --git a/fs/affs/inode.c b/fs/affs/inode.c
> index 3a0fdec..2100852 100644
> --- a/fs/affs/inode.c
> +++ b/fs/affs/inode.c
> @@ -388,7 +388,7 @@ affs_add_entry(struct inode *dir, struct inode *inode, struct dentry *dentry, s3
> 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);
> + iref(inode);
> }
> affs_fix_checksum(sb, bh);
> mark_buffer_dirty_inode(bh, inode);
> diff --git a/fs/afs/dir.c b/fs/afs/dir.c
> index 0d38c09..87d8c03 100644
> --- a/fs/afs/dir.c
> +++ b/fs/afs/dir.c
> @@ -1045,7 +1045,7 @@ static int afs_link(struct dentry *from, struct inode *dir,
> if (ret < 0)
> goto link_error;
>
> - atomic_inc(&vnode->vfs_inode.i_count);
> + iref(&vnode->vfs_inode);
> d_instantiate(dentry, &vnode->vfs_inode);
> key_put(key);
> _leave(" = 0");
> diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
> index e4b75d6..451be78 100644
> --- a/fs/anon_inodes.c
> +++ b/fs/anon_inodes.c
> @@ -109,12 +109,7 @@ struct file *anon_inode_getfile(const char *name,
> goto err_module;
>
> path.mnt = mntget(anon_inode_mnt);
> - /*
> - * We know the anon_inode inode count is always greater than zero,
> - * so we can avoid doing an igrab() and we can use an open-coded
> - * atomic_inc().
> - */
> - atomic_inc(&anon_inode_inode->i_count);
> + iref(anon_inode_inode);
>
> path.dentry->d_op = &anon_inodefs_dentry_operations;
> d_instantiate(path.dentry, anon_inode_inode);
> diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
> index d967e05..6e93a37 100644
> --- a/fs/bfs/dir.c
> +++ b/fs/bfs/dir.c
> @@ -176,7 +176,7 @@ static int bfs_link(struct dentry *old, struct inode *dir,
> inc_nlink(inode);
> inode->i_ctime = CURRENT_TIME_SEC;
> mark_inode_dirty(inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
> d_instantiate(new, inode);
> mutex_unlock(&info->bfs_lock);
> return 0;
> diff --git a/fs/block_dev.c b/fs/block_dev.c
> index 63b1c4c..11ad53d 100644
> --- a/fs/block_dev.c
> +++ b/fs/block_dev.c
> @@ -565,7 +565,7 @@ EXPORT_SYMBOL(bdget);
> */
> struct block_device *bdgrab(struct block_device *bdev)
> {
> - atomic_inc(&bdev->bd_inode->i_count);
> + iref(bdev->bd_inode);
> return bdev;
> }
>
> @@ -595,7 +595,7 @@ static struct block_device *bd_acquire(struct inode *inode)
> spin_lock(&bdev_lock);
> bdev = inode->i_bdev;
> if (bdev) {
> - atomic_inc(&bdev->bd_inode->i_count);
> + bdgrab(bdev);
> spin_unlock(&bdev_lock);
> return bdev;
> }
> @@ -606,12 +606,11 @@ static struct block_device *bd_acquire(struct inode *inode)
> spin_lock(&bdev_lock);
> if (!inode->i_bdev) {
> /*
> - * We take an additional bd_inode->i_count for inode,
> - * and it's released in clear_inode() of inode.
> - * So, we can access it via ->i_mapping always
> - * without igrab().
> + * We take an additional bdev reference here so
> + * we can access it via ->i_mapping always
> + * without first needing to grab a reference.
> */
> - atomic_inc(&bdev->bd_inode->i_count);
> + bdgrab(bdev);
> inode->i_bdev = bdev;
> inode->i_mapping = bdev->bd_inode->i_mapping;
> list_add(&inode->i_devices, &bdev->bd_inodes);
> diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
> index c038644..80e28bf 100644
> --- a/fs/btrfs/inode.c
> +++ b/fs/btrfs/inode.c
> @@ -4758,7 +4758,7 @@ static int btrfs_link(struct dentry *old_dentry, struct inode *dir,
> }
>
> btrfs_set_trans_block_group(trans, dir);
> - atomic_inc(&inode->i_count);
> + iref(inode);
>
> err = btrfs_add_nondir(trans, dentry, inode, 1, index);
>
> diff --git a/fs/coda/dir.c b/fs/coda/dir.c
> index ccd98b0..ac8b913 100644
> --- a/fs/coda/dir.c
> +++ b/fs/coda/dir.c
> @@ -303,7 +303,7 @@ static int coda_link(struct dentry *source_de, struct inode *dir_inode,
> }
>
> coda_dir_update_mtime(dir_inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
> d_instantiate(de, inode);
> inc_nlink(inode);
>
> diff --git a/fs/drop_caches.c b/fs/drop_caches.c
> index 2195c21..c2721fa 100644
> --- a/fs/drop_caches.c
> +++ b/fs/drop_caches.c
> @@ -22,7 +22,7 @@ static void drop_pagecache_sb(struct super_block *sb, void *unused)
> continue;
> if (inode->i_mapping->nrpages == 0)
> continue;
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> spin_unlock(&inode_lock);
> invalidate_mapping_pages(inode->i_mapping, 0, -1);
> iput(toput_inode);
> diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
> index eb7368e..b631ff3 100644
> --- a/fs/exofs/inode.c
> +++ b/fs/exofs/inode.c
> @@ -1154,7 +1154,7 @@ struct inode *exofs_new_inode(struct inode *dir, int mode)
> /* increment the refcount so that the inode will still be around when we
> * reach the callback
> */
> - atomic_inc(&inode->i_count);
> + iref(inode);
>
> ios->done = create_done;
> ios->private = inode;
> diff --git a/fs/exofs/namei.c b/fs/exofs/namei.c
> index b7dd0c2..f2a30a0 100644
> --- a/fs/exofs/namei.c
> +++ b/fs/exofs/namei.c
> @@ -153,7 +153,7 @@ static int exofs_link(struct dentry *old_dentry, struct inode *dir,
>
> inode->i_ctime = CURRENT_TIME;
> inode_inc_link_count(inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
>
> return exofs_add_nondir(dentry, inode);
> }
> diff --git a/fs/ext2/namei.c b/fs/ext2/namei.c
> index 71efb0e..b15435f 100644
> --- a/fs/ext2/namei.c
> +++ b/fs/ext2/namei.c
> @@ -206,7 +206,7 @@ static int ext2_link (struct dentry * old_dentry, struct inode * dir,
>
> inode->i_ctime = CURRENT_TIME_SEC;
> inode_inc_link_count(inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
>
> err = ext2_add_link(dentry, inode);
> if (!err) {
> diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
> index 2b35ddb..6c7a5d6 100644
> --- a/fs/ext3/namei.c
> +++ b/fs/ext3/namei.c
> @@ -2260,7 +2260,7 @@ retry:
>
> inode->i_ctime = CURRENT_TIME_SEC;
> inc_nlink(inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
>
> err = ext3_add_entry(handle, dentry, inode);
> if (!err) {
> diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
> index 314c0d3..a406a85 100644
> --- a/fs/ext4/namei.c
> +++ b/fs/ext4/namei.c
> @@ -2312,7 +2312,7 @@ retry:
>
> inode->i_ctime = ext4_current_time(inode);
> ext4_inc_count(handle, inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
>
> err = ext4_add_entry(handle, dentry, inode);
> if (!err) {
> diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
> index 92d73b6..595dfc6 100644
> --- a/fs/fs-writeback.c
> +++ b/fs/fs-writeback.c
> @@ -298,8 +298,7 @@ static void inode_wait_for_writeback(struct inode *inode)
>
> /*
> * Write out an inode's dirty pages. Called under inode_lock. Either the
> - * caller has ref on the inode (either via __iget or via syscall against an fd)
> - * or the inode has I_WILL_FREE set (via generic_forget_inode)
> + * caller has a reference on the inode or the inode has I_WILL_FREE set.
> *
> * If `wait' is set, wait on the writeout.
> *
> @@ -500,7 +499,7 @@ static int writeback_sb_inodes(struct super_block *sb, struct bdi_writeback *wb,
> return 1;
>
> BUG_ON(inode->i_state & I_FREEING);
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> pages_skipped = wbc->pages_skipped;
> writeback_single_inode(inode, wbc);
> if (wbc->pages_skipped != pages_skipped) {
> @@ -1046,7 +1045,7 @@ static void wait_sb_inodes(struct super_block *sb)
> mapping = inode->i_mapping;
> if (mapping->nrpages == 0)
> continue;
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> spin_unlock(&inode_lock);
> /*
> * We hold a reference to 'inode' so it couldn't have
> diff --git a/fs/gfs2/ops_inode.c b/fs/gfs2/ops_inode.c
> index 1009be2..508407d 100644
> --- a/fs/gfs2/ops_inode.c
> +++ b/fs/gfs2/ops_inode.c
> @@ -253,7 +253,7 @@ out_parent:
> gfs2_holder_uninit(ghs);
> gfs2_holder_uninit(ghs + 1);
> if (!error) {
> - atomic_inc(&inode->i_count);
> + iref(inode);
> d_instantiate(dentry, inode);
> mark_inode_dirty(inode);
> }
> diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
> index 764fd1b..e2ce54d 100644
> --- a/fs/hfsplus/dir.c
> +++ b/fs/hfsplus/dir.c
> @@ -301,7 +301,7 @@ static int hfsplus_link(struct dentry *src_dentry, struct inode *dst_dir,
>
> inc_nlink(inode);
> hfsplus_instantiate(dst_dentry, inode, cnid);
> - atomic_inc(&inode->i_count);
> + iref(inode);
> inode->i_ctime = CURRENT_TIME_SEC;
> mark_inode_dirty(inode);
> HFSPLUS_SB(sb).file_count++;
> diff --git a/fs/inode.c b/fs/inode.c
> index 964d2d9..4f0e56c 100644
> --- a/fs/inode.c
> +++ b/fs/inode.c
> @@ -314,13 +314,23 @@ static void init_once(void *foo)
> inode_init_once(inode);
> }
>
> -/*
> - * inode_lock must be held
> +/**
> + * iref - increment the reference count on an inode
> + * @inode: inode to take a reference on
> + *
> + * iref() should be called to take an extra reference to an inode. The inode
> + * must already have a reference count obtained via igrab() as iref() does not
> + * do checks for the inode being freed and hence cannot be used to initially
> + * obtain a reference to the inode.
> */
> -void __iget(struct inode *inode)
> +void iref(struct inode *inode)
> {
> + WARN_ON(atomic_read(&inode->i_count) < 1);
> + spin_lock(&inode_lock);
> atomic_inc(&inode->i_count);
> + spin_unlock(&inode_lock);
> }
> +EXPORT_SYMBOL_GPL(iref);
>
> void inode_lru_list_add(struct inode *inode)
> {
> @@ -510,7 +520,7 @@ static void prune_icache(int nr_to_scan)
> continue;
> }
> if (inode_has_buffers(inode) || inode->i_data.nrpages) {
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> spin_unlock(&inode_lock);
> if (remove_inode_buffers(inode))
> reap += invalidate_mapping_pages(&inode->i_data,
> @@ -578,7 +588,7 @@ static struct shrinker icache_shrinker = {
> static void __wait_on_freeing_inode(struct inode *inode);
> /*
> * Called with the inode lock held.
> - * NOTE: we are not increasing the inode-refcount, you must call __iget()
> + * NOTE: we are not increasing the inode-refcount, you must take a reference
> * by hand after calling find_inode now! This simplifies iunique and won't
> * add any additional branch in the common code.
> */
> @@ -782,7 +792,7 @@ static struct inode *get_new_inode(struct super_block *sb,
> * us. Use the old inode instead of the one we just
> * allocated.
> */
> - __iget(old);
> + atomic_inc(&old->i_count);
> spin_unlock(&inode_lock);
> destroy_inode(inode);
> inode = old;
> @@ -829,7 +839,7 @@ static struct inode *get_new_inode_fast(struct super_block *sb,
> * us. Use the old inode instead of the one we just
> * allocated.
> */
> - __iget(old);
> + atomic_inc(&old->i_count);
> spin_unlock(&inode_lock);
> destroy_inode(inode);
> inode = old;
> @@ -882,7 +892,7 @@ struct inode *igrab(struct inode *inode)
> {
> spin_lock(&inode_lock);
> if (!(inode->i_state & (I_FREEING|I_WILL_FREE)))
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> else
> /*
> * Handle the case where s_op->clear_inode is not been
> @@ -923,7 +933,7 @@ static struct inode *ifind(struct super_block *sb,
> spin_lock(&inode_lock);
> inode = find_inode(sb, head, test, data);
> if (inode) {
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> spin_unlock(&inode_lock);
> if (likely(wait))
> wait_on_inode(inode);
> @@ -956,7 +966,7 @@ static struct inode *ifind_fast(struct super_block *sb,
> spin_lock(&inode_lock);
> inode = find_inode_fast(sb, head, ino);
> if (inode) {
> - __iget(inode);
> + atomic_inc(&inode->i_count);
> spin_unlock(&inode_lock);
> wait_on_inode(inode);
> return inode;
> @@ -1139,7 +1149,7 @@ int insert_inode_locked(struct inode *inode)
> spin_unlock(&inode_lock);
> return 0;
> }
> - __iget(old);
> + atomic_inc(&old->i_count);
> spin_unlock(&inode_lock);
> wait_on_inode(old);
> if (unlikely(!hlist_unhashed(&old->i_hash))) {
> @@ -1178,7 +1188,7 @@ int insert_inode_locked4(struct inode *inode, unsigned long hashval,
> spin_unlock(&inode_lock);
> return 0;
> }
> - __iget(old);
> + atomic_inc(&old->i_count);
> spin_unlock(&inode_lock);
> wait_on_inode(old);
> if (unlikely(!hlist_unhashed(&old->i_hash))) {
> diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
> index ed78a3c..797a034 100644
> --- a/fs/jffs2/dir.c
> +++ b/fs/jffs2/dir.c
> @@ -289,7 +289,7 @@ static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct de
> 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);
> + iref(old_dentry->d_inode);
> }
> return ret;
> }
> @@ -864,7 +864,7 @@ static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
> 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);
> + iref(old_dentry->d_inode);
> new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
> return ret;
> }
> diff --git a/fs/jfs/jfs_txnmgr.c b/fs/jfs/jfs_txnmgr.c
> index d945ea7..3e6dd08 100644
> --- a/fs/jfs/jfs_txnmgr.c
> +++ b/fs/jfs/jfs_txnmgr.c
> @@ -1279,7 +1279,7 @@ int txCommit(tid_t tid, /* transaction identifier */
> * lazy commit thread finishes processing
> */
> if (tblk->xflag & COMMIT_DELETE) {
> - atomic_inc(&tblk->u.ip->i_count);
> + iref(tblk->u.ip);
> /*
> * Avoid a rare deadlock
> *
> diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
> index a9cf8e8..3d3566e 100644
> --- a/fs/jfs/namei.c
> +++ b/fs/jfs/namei.c
> @@ -839,7 +839,7 @@ static int jfs_link(struct dentry *old_dentry,
> ip->i_ctime = CURRENT_TIME;
> dir->i_ctime = dir->i_mtime = CURRENT_TIME;
> mark_inode_dirty(dir);
> - atomic_inc(&ip->i_count);
> + iref(ip);
>
> iplist[0] = ip;
> iplist[1] = dir;
> diff --git a/fs/libfs.c b/fs/libfs.c
> index 0a9da95..f190d73 100644
> --- a/fs/libfs.c
> +++ b/fs/libfs.c
> @@ -255,7 +255,7 @@ int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *den
>
> inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
> inc_nlink(inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
> dget(dentry);
> d_instantiate(dentry, inode);
> return 0;
> diff --git a/fs/logfs/dir.c b/fs/logfs/dir.c
> index 9777eb5..8522edc 100644
> --- a/fs/logfs/dir.c
> +++ b/fs/logfs/dir.c
> @@ -569,7 +569,7 @@ static int logfs_link(struct dentry *old_dentry, struct inode *dir,
> return -EMLINK;
>
> inode->i_ctime = dir->i_ctime = dir->i_mtime = CURRENT_TIME;
> - atomic_inc(&inode->i_count);
> + iref(inode);
> inode->i_nlink++;
> mark_inode_dirty_sync(inode);
>
> diff --git a/fs/minix/namei.c b/fs/minix/namei.c
> index f3f3578..7563a82 100644
> --- a/fs/minix/namei.c
> +++ b/fs/minix/namei.c
> @@ -101,7 +101,7 @@ static int minix_link(struct dentry * old_dentry, struct inode * dir,
>
> inode->i_ctime = CURRENT_TIME_SEC;
> inode_inc_link_count(inode);
> - atomic_inc(&inode->i_count);
> + iref(inode);
> return add_nondir(dentry, inode);
> }
>
> diff --git a/fs/namei.c b/fs/namei.c
> index 24896e8..5fb93f3 100644
> --- a/fs/namei.c
> +++ b/fs/namei.c
> @@ -2291,7 +2291,7 @@ static long do_unlinkat(int dfd, const char __user *pathname)
> goto slashes;
> inode = dentry->d_inode;
> if (inode)
> - atomic_inc(&inode->i_count);
> + iref(inode);
> error = mnt_want_write(nd.path.mnt);
> if (error)
> goto exit2;
> diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
> index e257172..5482ede 100644
> --- a/fs/nfs/dir.c
> +++ b/fs/nfs/dir.c
> @@ -1580,7 +1580,7 @@ nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
> d_drop(dentry);
> error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name);
> if (error == 0) {
> - atomic_inc(&inode->i_count);
> + iref(inode);
> d_add(dentry, inode);
> }
> return error;
> diff --git a/fs/nfs/getroot.c b/fs/nfs/getroot.c
> index a70e446..5aaa2be 100644
> --- a/fs/nfs/getroot.c
> +++ b/fs/nfs/getroot.c
> @@ -55,7 +55,7 @@ static int nfs_superblock_set_dummy_root(struct super_block *sb, struct inode *i
> return -ENOMEM;
> }
> /* Circumvent igrab(): we know the inode is not being freed */
> - atomic_inc(&inode->i_count);
> + iref(inode);
> /*
> * Ensure that this dentry is invisible to d_find_alias().
> * Otherwise, it may be spliced into the tree by
> diff --git a/fs/nfs/write.c b/fs/nfs/write.c
> index 874972d..d1c2f08 100644
> --- a/fs/nfs/write.c
> +++ b/fs/nfs/write.c
> @@ -390,7 +390,7 @@ static int nfs_inode_add_request(struct inode *inode, struct nfs_page *req)
> error = radix_tree_insert(&nfsi->nfs_page_tree, req->wb_index, req);
> BUG_ON(error);
> if (!nfsi->npages) {
> - igrab(inode);
> + iref(inode);
> if (nfs_have_delegation(inode, FMODE_WRITE))
> nfsi->change_attr++;
This one already has i_lock and needs an opencoded increment.
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