Commit 7dcda1c9 authored by Jens Axboe's avatar Jens Axboe

fs: export empty_aops

With the ->sync_page() hook gone, we have a few users that
add their own static address_space_operations without any
functions defined.

fs/inode.c already has an empty_aops that it uses for init
purposes. Lets export that and use it in the places where
an otherwise empty aops was defined.
Signed-off-by: default avatarJens Axboe <jaxboe@fusionio.com>
parent 929e2725
...@@ -124,6 +124,14 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock); ...@@ -124,6 +124,14 @@ __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock);
*/ */
static DECLARE_RWSEM(iprune_sem); static DECLARE_RWSEM(iprune_sem);
/*
* Empty aops. Can be used for the cases where the user does not
* define any of the address_space operations.
*/
const struct address_space_operations empty_aops = {
};
EXPORT_SYMBOL(empty_aops);
/* /*
* Statistics gathering.. * Statistics gathering..
*/ */
...@@ -176,7 +184,6 @@ int proc_nr_inodes(ctl_table *table, int write, ...@@ -176,7 +184,6 @@ int proc_nr_inodes(ctl_table *table, int write,
*/ */
int inode_init_always(struct super_block *sb, struct inode *inode) int inode_init_always(struct super_block *sb, struct inode *inode)
{ {
static const struct address_space_operations empty_aops;
static const struct inode_operations empty_iops; static const struct inode_operations empty_iops;
static const struct file_operations empty_fops; static const struct file_operations empty_fops;
struct address_space *const mapping = &inode->i_data; struct address_space *const mapping = &inode->i_data;
......
...@@ -495,8 +495,6 @@ unsigned nilfs_page_count_clean_buffers(struct page *page, ...@@ -495,8 +495,6 @@ unsigned nilfs_page_count_clean_buffers(struct page *page,
void nilfs_mapping_init(struct address_space *mapping, void nilfs_mapping_init(struct address_space *mapping,
struct backing_dev_info *bdi) struct backing_dev_info *bdi)
{ {
static const struct address_space_operations empty_aops;
mapping->host = NULL; mapping->host = NULL;
mapping->flags = 0; mapping->flags = 0;
mapping_set_gfp_mask(mapping, GFP_NOFS); mapping_set_gfp_mask(mapping, GFP_NOFS);
......
...@@ -56,6 +56,7 @@ ...@@ -56,6 +56,7 @@
*/ */
#include "ubifs.h" #include "ubifs.h"
#include <linux/fs.h>
#include <linux/slab.h> #include <linux/slab.h>
#include <linux/xattr.h> #include <linux/xattr.h>
#include <linux/posix_acl_xattr.h> #include <linux/posix_acl_xattr.h>
...@@ -80,7 +81,6 @@ enum { ...@@ -80,7 +81,6 @@ enum {
}; };
static const struct inode_operations none_inode_operations; static const struct inode_operations none_inode_operations;
static const struct address_space_operations none_address_operations;
static const struct file_operations none_file_operations; static const struct file_operations none_file_operations;
/** /**
...@@ -130,7 +130,7 @@ static int create_xattr(struct ubifs_info *c, struct inode *host, ...@@ -130,7 +130,7 @@ static int create_xattr(struct ubifs_info *c, struct inode *host,
} }
/* Re-define all operations to be "nothing" */ /* Re-define all operations to be "nothing" */
inode->i_mapping->a_ops = &none_address_operations; inode->i_mapping->a_ops = &empty_aops;
inode->i_op = &none_inode_operations; inode->i_op = &none_inode_operations;
inode->i_fop = &none_file_operations; inode->i_fop = &none_file_operations;
......
...@@ -613,6 +613,8 @@ struct address_space_operations { ...@@ -613,6 +613,8 @@ struct address_space_operations {
int (*error_remove_page)(struct address_space *, struct page *); int (*error_remove_page)(struct address_space *, struct page *);
}; };
extern const struct address_space_operations empty_aops;
/* /*
* pagecache_write_begin/pagecache_write_end must be used by general code * pagecache_write_begin/pagecache_write_end must be used by general code
* to write into the pagecache. * to write into the pagecache.
......
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