mm: bdi init hooks

provide BDI constructor/destructor hooks

[akpm@linux-foundation.org: compile fix]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

19 files changed, 131 insertions, 7 deletions

diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index 9eabac95fbe0..524404bd08c1 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -1786,6 +1786,7 @@ static void blk_release_queue(struct kobject *kobj)
 
 	blk_trace_shutdown(q);
 
+	bdi_destroy(&q->backing_dev_info);
 	kmem_cache_free(requestq_cachep, q);
 }
 
@@ -1839,21 +1840,27 @@ static struct kobj_type queue_ktype;
 struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id)
 {
 	struct request_queue *q;
+	int err;
 
 	q = kmem_cache_alloc_node(requestq_cachep,
 				gfp_mask | __GFP_ZERO, node_id);
 	if (!q)
 		return NULL;
 
+	q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
+	q->backing_dev_info.unplug_io_data = q;
+	err = bdi_init(&q->backing_dev_info);
+	if (err) {
+		kmem_cache_free(requestq_cachep, q);
+		return NULL;
+	}
+
 	init_timer(&q->unplug_timer);
 
 	kobject_set_name(&q->kobj, "%s", "queue");
 	q->kobj.ktype = &queue_ktype;
 	kobject_init(&q->kobj);
 
-	q->backing_dev_info.unplug_io_fn = blk_backing_dev_unplug;
-	q->backing_dev_info.unplug_io_data = q;
-
 	mutex_init(&q->sysfs_lock);
 
 	return q;
diff --git a/drivers/block/rd.c b/drivers/block/rd.c
index 701ea77f62e9..80e1585b741e 100644
--- a/drivers/block/rd.c
+++ b/drivers/block/rd.c
@@ -411,6 +411,9 @@ static void __exit rd_cleanup(void)
 		blk_cleanup_queue(rd_queue[i]);
 	}
 	unregister_blkdev(RAMDISK_MAJOR, "ramdisk");
+
+	bdi_destroy(&rd_file_backing_dev_info);
+	bdi_destroy(&rd_backing_dev_info);
 }
 
 /*
@@ -419,7 +422,19 @@ static void __exit rd_cleanup(void)
 static int __init rd_init(void)
 {
 	int i;
-	int err = -ENOMEM;
+	int err;
+
+	err = bdi_init(&rd_backing_dev_info);
+	if (err)
+		goto out2;
+
+	err = bdi_init(&rd_file_backing_dev_info);
+	if (err) {
+		bdi_destroy(&rd_backing_dev_info);
+		goto out2;
+	}
+
+	err = -ENOMEM;
 
 	if (rd_blocksize > PAGE_SIZE || rd_blocksize < 512 ||
 			(rd_blocksize & (rd_blocksize-1))) {
@@ -473,6 +488,9 @@ out:
 		put_disk(rd_disks[i]);
 		blk_cleanup_queue(rd_queue[i]);
 	}
+	bdi_destroy(&rd_backing_dev_info);
+	bdi_destroy(&rd_file_backing_dev_info);
+out2:
 	return err;
 }
 
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 64551ab6be03..0e937f64a789 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -893,6 +893,11 @@ static struct class *mem_class;
 static int __init chr_dev_init(void)
 {
 	int i;
+	int err;
+
+	err = bdi_init(&zero_bdi);
+	if (err)
+		return err;
 
 	if (register_chrdev(MEM_MAJOR,"mem",&memory_fops))
 		printk("unable to get major %d for memory devs\n", MEM_MAJOR);
diff --git a/fs/char_dev.c b/fs/char_dev.c
index bbbf07baa145..c3bfa76765c4 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -545,6 +545,7 @@ static struct kobject *base_probe(dev_t dev, int *part, void *data)
 void __init chrdev_init(void)
 {
 	cdev_map = kobj_map_init(base_probe, &chrdevs_lock);
+	bdi_init(&directly_mappable_cdev_bdi);
 }
 
 
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index 3b0185fdf9a4..cca98609aa7f 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -56,6 +56,8 @@ extern int configfs_is_root(struct config_item *item);
 
 extern struct inode * configfs_new_inode(mode_t mode, struct configfs_dirent *);
 extern int configfs_create(struct dentry *, int mode, int (*init)(struct inode *));
+extern int configfs_inode_init(void);
+extern void configfs_inode_exit(void);
 
 extern int configfs_create_file(struct config_item *, const struct configfs_attribute *);
 extern int configfs_make_dirent(struct configfs_dirent *,
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index dbd257d956c4..4c1ebff778ee 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -256,4 +256,12 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
 	mutex_unlock(&dir->d_inode->i_mutex);
 }
 
+int __init configfs_inode_init(void)
+{
+	return bdi_init(&configfs_backing_dev_info);
+}
 
+void __exit configfs_inode_exit(void)
+{
+	bdi_destroy(&configfs_backing_dev_info);
+}
diff --git a/fs/configfs/mount.c b/fs/configfs/mount.c
index 871b0cb61839..3bf0278ea843 100644
--- a/fs/configfs/mount.c
+++ b/fs/configfs/mount.c
@@ -154,8 +154,16 @@ static int __init configfs_init(void)
 		subsystem_unregister(&config_subsys);
 		kmem_cache_destroy(configfs_dir_cachep);
 		configfs_dir_cachep = NULL;
+		goto out;
 	}
 
+	err = configfs_inode_init();
+	if (err) {
+		unregister_filesystem(&configfs_fs_type);
+		subsystem_unregister(&config_subsys);
+		kmem_cache_destroy(configfs_dir_cachep);
+		configfs_dir_cachep = NULL;
+	}
 out:
 	return err;
 }
@@ -166,6 +174,7 @@ static void __exit configfs_exit(void)
 	subsystem_unregister(&config_subsys);
 	kmem_cache_destroy(configfs_dir_cachep);
 	configfs_dir_cachep = NULL;
+	configfs_inode_exit();
 }
 
 MODULE_AUTHOR("Oracle");
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 5448f625ab56..ca30b6ac03f0 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -401,6 +401,7 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
 static struct fuse_conn *new_conn(void)
 {
 	struct fuse_conn *fc;
+	int err;
 
 	fc = kzalloc(sizeof(*fc), GFP_KERNEL);
 	if (fc) {
@@ -416,10 +417,17 @@ static struct fuse_conn *new_conn(void)
 		atomic_set(&fc->num_waiting, 0);
 		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
 		fc->bdi.unplug_io_fn = default_unplug_io_fn;
+		err = bdi_init(&fc->bdi);
+		if (err) {
+			kfree(fc);
+			fc = NULL;
+			goto out;
+		}
 		fc->reqctr = 0;
 		fc->blocked = 1;
 		get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
 	}
+out:
 	return fc;
 }
 
@@ -429,6 +437,7 @@ void fuse_conn_put(struct fuse_conn *fc)
 		if (fc->destroy_req)
 			fuse_request_free(fc->destroy_req);
 		mutex_destroy(&fc->inst_mutex);
+		bdi_destroy(&fc->bdi);
 		kfree(fc);
 	}
 }
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 04598e12c489..0d9a2055ddee 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -974,11 +974,15 @@ static int __init init_hugetlbfs_fs(void)
 	int error;
 	struct vfsmount *vfsmount;
 
+	error = bdi_init(&hugetlbfs_backing_dev_info);
+	if (error)
+		return error;
+
 	hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
 					sizeof(struct hugetlbfs_inode_info),
 					0, 0, init_once);
 	if (hugetlbfs_inode_cachep == NULL)
-		return -ENOMEM;
+		goto out2;
 
 	error = register_filesystem(&hugetlbfs_fs_type);
 	if (error)
@@ -996,6 +1000,8 @@ static int __init init_hugetlbfs_fs(void)
  out:
 	if (error)
 		kmem_cache_destroy(hugetlbfs_inode_cachep);
+ out2:
+	bdi_destroy(&hugetlbfs_backing_dev_info);
 	return error;
 }
 
@@ -1003,6 +1009,7 @@ static void __exit exit_hugetlbfs_fs(void)
 {
 	kmem_cache_destroy(hugetlbfs_inode_cachep);
 	unregister_filesystem(&hugetlbfs_fs_type);
+	bdi_destroy(&hugetlbfs_backing_dev_info);
 }
 
 module_init(init_hugetlbfs_fs)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index a532ee12740a..70587f383f10 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -627,6 +627,7 @@ static void nfs_server_set_fsinfo(struct nfs_server *server, struct nfs_fsinfo *
 	if (server->rsize > NFS_MAX_FILE_IO_SIZE)
 		server->rsize = NFS_MAX_FILE_IO_SIZE;
 	server->rpages = (server->rsize + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
+
 	server->backing_dev_info.ra_pages = server->rpages * NFS_MAX_READAHEAD;
 
 	if (server->wsize > max_rpc_payload)
@@ -677,6 +678,10 @@ static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, str
 		goto out_error;
 
 	nfs_server_set_fsinfo(server, &fsinfo);
+	error = bdi_init(&server->backing_dev_info);
+	if (error)
+		goto out_error;
+
 
 	/* Get some general file system info */
 	if (server->namelen == 0) {
@@ -756,6 +761,7 @@ void nfs_free_server(struct nfs_server *server)
 	nfs_put_client(server->nfs_client);
 
 	nfs_free_iostats(server->io_stats);
+	bdi_destroy(&server->backing_dev_info);
 	kfree(server);
 	nfs_release_automount_timer();
 	dprintk("<-- nfs_free_server()\n");
diff --git a/fs/ocfs2/dlm/dlmfs.c b/fs/ocfs2/dlm/dlmfs.c
index 7418dc83de1c..1150412758ac 100644
--- a/fs/ocfs2/dlm/dlmfs.c
+++ b/fs/ocfs2/dlm/dlmfs.c
@@ -588,13 +588,17 @@ static int __init init_dlmfs_fs(void)
 
 	dlmfs_print_version();
 
+	status = bdi_init(&dlmfs_backing_dev_info);
+	if (status)
+		return status;
+
 	dlmfs_inode_cache = kmem_cache_create("dlmfs_inode_cache",
 				sizeof(struct dlmfs_inode_private),
 				0, (SLAB_HWCACHE_ALIGN|SLAB_RECLAIM_ACCOUNT|
 					SLAB_MEM_SPREAD),
 				dlmfs_init_once);
 	if (!dlmfs_inode_cache)
-		return -ENOMEM;
+		goto bail;
 	cleanup_inode = 1;
 
 	user_dlm_worker = create_singlethread_workqueue("user_dlm");
@@ -611,6 +615,7 @@ bail:
 			kmem_cache_destroy(dlmfs_inode_cache);
 		if (cleanup_worker)
 			destroy_workqueue(user_dlm_worker);
+		bdi_destroy(&dlmfs_backing_dev_info);
 	} else
 		printk("OCFS2 User DLM kernel interface loaded\n");
 	return status;
@@ -624,6 +629,8 @@ static void __exit exit_dlmfs_fs(void)
 	destroy_workqueue(user_dlm_worker);
 
 	kmem_cache_destroy(dlmfs_inode_cache);
+
+	bdi_destroy(&dlmfs_backing_dev_info);
 }
 
 MODULE_AUTHOR("Oracle");
diff --git a/fs/ramfs/inode.c b/fs/ramfs/inode.c
index ef2b46d099ff..8428d5b2711d 100644
--- a/fs/ramfs/inode.c
+++ b/fs/ramfs/inode.c
@@ -223,7 +223,17 @@ module_exit(exit_ramfs_fs)
 
 int __init init_rootfs(void)
 {
-	return register_filesystem(&rootfs_fs_type);
+	int err;
+
+	err = bdi_init(&ramfs_backing_dev_info);
+	if (err)
+		return err;
+
+	err = register_filesystem(&rootfs_fs_type);
+	if (err)
+		bdi_destroy(&ramfs_backing_dev_info);
+
+	return err;
 }
 
 MODULE_LICENSE("GPL");
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index c4ef945d39c8..d9262f74f94e 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -37,6 +37,11 @@ static const struct inode_operations sysfs_inode_operations ={
 	.setattr	= sysfs_setattr,
 };
 
+int __init sysfs_inode_init(void)
+{
+	return bdi_init(&sysfs_backing_dev_info);
+}
+
 int sysfs_setattr(struct dentry * dentry, struct iattr * iattr)
 {
 	struct inode * inode = dentry->d_inode;
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index c76c540be3c8..74168266cd59 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -92,6 +92,10 @@ int __init sysfs_init(void)
 	if (!sysfs_dir_cachep)
 		goto out;
 
+	err = sysfs_inode_init();
+	if (err)
+		goto out_err;
+
 	err = register_filesystem(&sysfs_fs_type);
 	if (!err) {
 		sysfs_mount = kern_mount(&sysfs_fs_type);
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index f0326f281d1c..f8417988f6b0 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -146,6 +146,7 @@ static inline void sysfs_put(struct sysfs_dirent *sd)
 struct inode *sysfs_get_inode(struct sysfs_dirent *sd);
 int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
 int sysfs_hash_and_remove(struct sysfs_dirent *dir_sd, const char *name);
+int sysfs_inode_init(void);
 
 /*
  * file.c
diff --git a/include/linux/backing-dev.h b/include/linux/backing-dev.h
index 210933c336f5..8f56634f537a 100644
--- a/include/linux/backing-dev.h
+++ b/include/linux/backing-dev.h
@@ -34,6 +34,14 @@ struct backing_dev_info {
 	void *unplug_io_data;
 };
 
+static inline int bdi_init(struct backing_dev_info *bdi)
+{
+	return 0;
+}
+
+static inline void bdi_destroy(struct backing_dev_info *bdi)
+{
+}
 
 /*
  * Flags in backing_dev_info::capability
diff --git a/mm/readahead.c b/mm/readahead.c
index 229788884010..c9c50ca1ec38 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -233,6 +233,12 @@ unsigned long max_sane_readahead(unsigned long nr)
 		+ node_page_state(numa_node_id(), NR_FREE_PAGES)) / 2);
 }
 
+static int __init readahead_init(void)
+{
+	return bdi_init(&default_backing_dev_info);
+}
+subsys_initcall(readahead_init);
+
 /*
  * Submit IO for the read-ahead request in file_ra_state.
  */
diff --git a/mm/shmem.c b/mm/shmem.c
index 8a82342a8595..2f039f32031f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2464,6 +2464,10 @@ static int __init init_tmpfs(void)
 {
 	int error;
 
+	error = bdi_init(&shmem_backing_dev_info);
+	if (error)
+		goto out4;
+
 	error = init_inodecache();
 	if (error)
 		goto out3;
@@ -2488,6 +2492,8 @@ out1:
 out2:
 	destroy_inodecache();
 out3:
+	bdi_destroy(&shmem_backing_dev_info);
+out4:
 	shm_mnt = ERR_PTR(error);
 	return error;
 }
diff --git a/mm/swap.c b/mm/swap.c
index d034b2128d2b..a65eff8a517a 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -28,6 +28,7 @@
 #include <linux/percpu.h>
 #include <linux/cpu.h>
 #include <linux/notifier.h>
+#include <linux/backing-dev.h>
 
 /* How many pages do we try to swap or page in/out together? */
 int page_cluster;
@@ -547,6 +548,10 @@ void __init swap_setup(void)
 {
 	unsigned long megs = num_physpages >> (20 - PAGE_SHIFT);
 
+#ifdef CONFIG_SWAP
+	bdi_init(swapper_space.backing_dev_info);
+#endif
+
 	/* Use a smaller cluster for small-memory machines */
 	if (megs < 16)
 		page_cluster = 2;