[PATCH 10/23] mm: bdi init hooks

From: Peter Zijlstra
Date: Fri Aug 03 2007 - 08:57:42 EST

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provide BDI constructor/destructor hooks

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
block/ll_rw_blk.c | 13 ++++++++++---
drivers/block/rd.c | 20 +++++++++++++++++++-
drivers/char/mem.c | 5 +++++
fs/char_dev.c | 1 +
fs/configfs/configfs_internal.h | 2 ++
fs/configfs/inode.c | 8 ++++++++
fs/configfs/mount.c | 9 +++++++++
fs/fuse/inode.c | 9 +++++++++
fs/hugetlbfs/inode.c | 9 ++++++++-
fs/nfs/client.c | 6 ++++++
fs/ocfs2/dlm/dlmfs.c | 9 ++++++++-
fs/ramfs/inode.c | 12 +++++++++++-
fs/sysfs/inode.c | 5 +++++
fs/sysfs/mount.c | 4 ++++
fs/sysfs/sysfs.h | 1 +
include/linux/backing-dev.h | 8 ++++++++
mm/readahead.c | 6 ++++++
mm/shmem.c | 6 ++++++
mm/swap.c | 4 ++++
19 files changed, 130 insertions(+), 7 deletions(-)

Index: linux-2.6/block/ll_rw_blk.c
===================================================================
--- linux-2.6.orig/block/ll_rw_blk.c
+++ linux-2.6/block/ll_rw_blk.c
@@ -1780,6 +1780,7 @@ static void blk_release_queue(struct kob

blk_trace_shutdown(q);

+ bdi_destroy(&q->backing_dev_info);
kmem_cache_free(requestq_cachep, q);
}

@@ -1833,21 +1834,27 @@ 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);

snprintf(q->kobj.name, KOBJ_NAME_LEN, "%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;
Index: linux-2.6/drivers/block/rd.c
===================================================================
--- linux-2.6.orig/drivers/block/rd.c
+++ linux-2.6/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;
}

Index: linux-2.6/drivers/char/mem.c
===================================================================
--- linux-2.6.orig/drivers/char/mem.c
+++ linux-2.6/drivers/char/mem.c
@@ -984,6 +984,11 @@ 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);
Index: linux-2.6/fs/char_dev.c
===================================================================
--- linux-2.6.orig/fs/char_dev.c
+++ linux-2.6/fs/char_dev.c
@@ -545,6 +545,7 @@ static struct kobject *base_probe(dev_t
void __init chrdev_init(void)
{
cdev_map = kobj_map_init(base_probe, &chrdevs_lock);
+ bdi_init(&directly_mappable_cdev_bdi);
}

Index: linux-2.6/fs/fuse/inode.c
===================================================================
--- linux-2.6.orig/fs/fuse/inode.c
+++ linux-2.6/fs/fuse/inode.c
@@ -418,6 +418,7 @@ static int fuse_show_options(struct seq_
static struct fuse_conn *new_conn(void)
{
struct fuse_conn *fc;
+ int err;

fc = kzalloc(sizeof(*fc), GFP_KERNEL);
if (fc) {
@@ -433,10 +434,17 @@ 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;
}

@@ -446,6 +454,7 @@ 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);
}
}
Index: linux-2.6/fs/nfs/client.c
===================================================================
--- linux-2.6.orig/fs/nfs/client.c
+++ linux-2.6/fs/nfs/client.c
@@ -632,6 +632,7 @@ static void nfs_server_set_fsinfo(struct
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)
@@ -682,6 +683,10 @@ static int nfs_probe_fsinfo(struct nfs_s
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) {
@@ -761,6 +766,7 @@ void nfs_free_server(struct nfs_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");
Index: linux-2.6/include/linux/backing-dev.h
===================================================================
--- linux-2.6.orig/include/linux/backing-dev.h
+++ linux-2.6/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
Index: linux-2.6/fs/hugetlbfs/inode.c
===================================================================
--- linux-2.6.orig/fs/hugetlbfs/inode.c
+++ linux-2.6/fs/hugetlbfs/inode.c
@@ -965,11 +965,15 @@ 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;
+ return out2;

error = register_filesystem(&hugetlbfs_fs_type);
if (error)
@@ -987,6 +991,8 @@ 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;
}

@@ -994,6 +1000,7 @@ static void __exit exit_hugetlbfs_fs(voi
{
kmem_cache_destroy(hugetlbfs_inode_cachep);
unregister_filesystem(&hugetlbfs_fs_type);
+ bdi_destroy(&hugetlbfs_backing_dev_info);
}

module_init(init_hugetlbfs_fs)
Index: linux-2.6/fs/ocfs2/dlm/dlmfs.c
===================================================================
--- linux-2.6.orig/fs/ocfs2/dlm/dlmfs.c
+++ linux-2.6/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");
Index: linux-2.6/fs/configfs/configfs_internal.h
===================================================================
--- linux-2.6.orig/fs/configfs/configfs_internal.h
+++ linux-2.6/fs/configfs/configfs_internal.h
@@ -56,6 +56,8 @@ extern int configfs_is_root(struct confi

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 *,
Index: linux-2.6/fs/configfs/inode.c
===================================================================
--- linux-2.6.orig/fs/configfs/inode.c
+++ linux-2.6/fs/configfs/inode.c
@@ -256,4 +256,12 @@ void configfs_hash_and_remove(struct den
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);
+}
Index: linux-2.6/fs/configfs/mount.c
===================================================================
--- linux-2.6.orig/fs/configfs/mount.c
+++ linux-2.6/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");
Index: linux-2.6/fs/ramfs/inode.c
===================================================================
--- linux-2.6.orig/fs/ramfs/inode.c
+++ linux-2.6/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");
Index: linux-2.6/fs/sysfs/inode.c
===================================================================
--- linux-2.6.orig/fs/sysfs/inode.c
+++ linux-2.6/fs/sysfs/inode.c
@@ -34,6 +34,11 @@ static const struct inode_operations sys
.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;
Index: linux-2.6/fs/sysfs/mount.c
===================================================================
--- linux-2.6.orig/fs/sysfs/mount.c
+++ linux-2.6/fs/sysfs/mount.c
@@ -90,6 +90,10 @@ 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);
Index: linux-2.6/fs/sysfs/sysfs.h
===================================================================
--- linux-2.6.orig/fs/sysfs/sysfs.h
+++ linux-2.6/fs/sysfs/sysfs.h
@@ -78,6 +78,7 @@ extern int sysfs_addrm_finish(struct sys

extern struct inode * sysfs_get_inode(struct sysfs_dirent *sd);
extern void sysfs_instantiate(struct dentry *dentry, struct inode *inode);
+extern int sysfs_inode_init(void);

extern void release_sysfs_dirent(struct sysfs_dirent * sd);
extern struct sysfs_dirent *sysfs_find_dirent(struct sysfs_dirent *parent_sd,
Index: linux-2.6/mm/shmem.c
===================================================================
--- linux-2.6.orig/mm/shmem.c
+++ linux-2.6/mm/shmem.c
@@ -2460,6 +2460,10 @@ 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;
@@ -2484,6 +2488,8 @@ out1:
out2:
destroy_inodecache();
out3:
+ bdi_destroy(&shmem_backing_dev_info);
+out4:
shm_mnt = ERR_PTR(error);
return error;
}
Index: linux-2.6/mm/swap.c
===================================================================
--- linux-2.6.orig/mm/swap.c
+++ linux-2.6/mm/swap.c
@@ -548,6 +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;
Index: linux-2.6/mm/readahead.c
===================================================================
--- linux-2.6.orig/mm/readahead.c
+++ linux-2.6/mm/readahead.c
@@ -234,6 +234,12 @@ unsigned long max_sane_readahead(unsigne
+ 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.
*/

--

-
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Next message: Peter Zijlstra: "[PATCH 14/23] mtd: give mtdconcat devices their own backing_dev_info"
Previous message: Peter Zijlstra: "[PATCH 08/23] lib: percpu_counter_init error handling"
In reply to: Peter Zijlstra: "[PATCH 08/23] lib: percpu_counter_init error handling"
Next in thread: Peter Zijlstra: "[PATCH 14/23] mtd: give mtdconcat devices their own backing_dev_info"
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