[PATCH 01/12] fs: deduplicate noop_backing_dev_info

Christoph Hellwig
2015-01-08T17:45:22Z

hugetlbfs, kernfs and dlmfs can simply use noop_backing_dev_info instead
of creating a local duplicate.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/hugetlbfs/inode.c | 14 +-------------
fs/kernfs/inode.c | 14 +-------------
fs/kernfs/kernfs-internal.h | 1 -
fs/kernfs/mount.c | 1 -
fs/ocfs2/dlmfs/dlmfs.c | 16 ++--------------
5 files changed, 4 insertions(+), 42 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 5eba47f..de7c95c 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -62,12 +62,6 @@ static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode)
return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);
}

-static struct backing_dev_info hugetlbfs_backing_dev_info = {
- .name = "hugetlbfs",
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
int sysctl_hugetlb_shm_group;

enum {
@@ -498,7 +492,7 @@ static struct inode *hugetlbfs_get_inode(struct super_block *sb,
lockdep_set_class(&inode->i_mapping->i_mmap_rwsem,
&hugetlbfs_i_mmap_rwsem_key);
inode->i_mapping->a_ops = &hugetlbfs_aops;
- inode->i_mapping->backing_dev_info =&hugetlbfs_backing_dev_info;
+ inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inode->i_mapping->private_data = resv_map;
info = HUGETLBFS_I(inode);
@@ -1032,10 +1026,6 @@ static int __init init_hugetlbfs_fs(void)
return -ENOTSUPP;
}

- error = bdi_init(&hugetlbfs_backing_dev_info);
- if (error)
- return error;
-
error = -ENOMEM;
hugetlbfs_inode_cachep = kmem_cache_create("hugetlbfs_inode_cache",
sizeof(struct hugetlbfs_inode_info),
@@ -1071,7 +1061,6 @@ static int __init init_hugetlbfs_fs(void)
out:
kmem_cache_destroy(hugetlbfs_inode_cachep);
out2:
- bdi_destroy(&hugetlbfs_backing_dev_info);
return error;
}

@@ -1091,7 +1080,6 @@ static void __exit exit_hugetlbfs_fs(void)
for_each_hstate(h)
kern_unmount(hugetlbfs_vfsmount[i++]);
unregister_filesystem(&hugetlbfs_fs_type);
- bdi_destroy(&hugetlbfs_backing_dev_info);
}

module_init(init_hugetlbfs_fs)
diff --git a/fs/kernfs/inode.c b/fs/kernfs/inode.c
index 9852176..06f0688 100644
--- a/fs/kernfs/inode.c
+++ b/fs/kernfs/inode.c
@@ -24,12 +24,6 @@ static const struct address_space_operations kernfs_aops = {
.write_end = simple_write_end,
};

-static struct backing_dev_info kernfs_bdi = {
- .name = "kernfs",
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
static const struct inode_operations kernfs_iops = {
.permission = kernfs_iop_permission,
.setattr = kernfs_iop_setattr,
@@ -40,12 +34,6 @@ static const struct inode_operations kernfs_iops = {
.listxattr = kernfs_iop_listxattr,
};

-void __init kernfs_inode_init(void)
-{
- if (bdi_init(&kernfs_bdi))
- panic("failed to init kernfs_bdi");
-}
-
static struct kernfs_iattrs *kernfs_iattrs(struct kernfs_node *kn)
{
static DEFINE_MUTEX(iattr_mutex);
@@ -298,7 +286,7 @@ static void kernfs_init_inode(struct kernfs_node *kn, struct inode *inode)
kernfs_get(kn);
inode->i_private = kn;
inode->i_mapping->a_ops = &kernfs_aops;
- inode->i_mapping->backing_dev_info = &kernfs_bdi;
+ inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
inode->i_op = &kernfs_iops;

set_default_inode_attr(inode, kn->mode);
diff --git a/fs/kernfs/kernfs-internal.h b/fs/kernfs/kernfs-internal.h
index dc84a3e..af9fa74 100644
--- a/fs/kernfs/kernfs-internal.h
+++ b/fs/kernfs/kernfs-internal.h
@@ -88,7 +88,6 @@ int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
size_t size);
ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
-void kernfs_inode_init(void);

/*
* dir.c
diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c
index f973ae9..8eaf417 100644
--- a/fs/kernfs/mount.c
+++ b/fs/kernfs/mount.c
@@ -246,5 +246,4 @@ void __init kernfs_init(void)
kernfs_node_cache = kmem_cache_create("kernfs_node_cache",
sizeof(struct kernfs_node),
0, SLAB_PANIC, NULL);
- kernfs_inode_init();
}
diff --git a/fs/ocfs2/dlmfs/dlmfs.c b/fs/ocfs2/dlmfs/dlmfs.c
index 57c40e3..6000d30 100644
--- a/fs/ocfs2/dlmfs/dlmfs.c
+++ b/fs/ocfs2/dlmfs/dlmfs.c
@@ -390,12 +390,6 @@ clear_fields:
ip->ip_conn = NULL;
}

-static struct backing_dev_info dlmfs_backing_dev_info = {
- .name = "ocfs2-dlmfs",
- .ra_pages = 0, /* No readahead */
- .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
static struct inode *dlmfs_get_root_inode(struct super_block *sb)
{
struct inode *inode = new_inode(sb);
@@ -404,7 +398,7 @@ static struct inode *dlmfs_get_root_inode(struct super_block *sb)
if (inode) {
inode->i_ino = get_next_ino();
inode_init_owner(inode, NULL, mode);
- inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
+ inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
inc_nlink(inode);

@@ -428,7 +422,7 @@ static struct inode *dlmfs_get_inode(struct inode *parent,

inode->i_ino = get_next_ino();
inode_init_owner(inode, parent, mode);
- inode->i_mapping->backing_dev_info = &dlmfs_backing_dev_info;
+ inode->i_mapping->backing_dev_info = &noop_backing_dev_info;
inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;

ip = DLMFS_I(inode);
@@ -643,10 +637,6 @@ static int __init init_dlmfs_fs(void)
int status;
int cleanup_inode = 0, cleanup_worker = 0;

- 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|
@@ -673,7 +663,6 @@ 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;
@@ -693,7 +682,6 @@ static void __exit exit_dlmfs_fs(void)
rcu_barrier();
kmem_cache_destroy(dlmfs_inode_cache);

- bdi_destroy(&dlmfs_backing_dev_info);
}

MODULE_AUTHOR("Oracle");
--
1.9.1