mm: redefine address_space.assoc_mapping

Overhaul struct address_space.assoc_mapping renaming it to
address_space.private_data and its type is redefined to void*.  By this
approach we consistently name the .private_* elements from struct
address_space as well as allow extended usage for address_space
association with other data structures through ->private_data.

Also, all users of old ->assoc_mapping element are converted to reflect
its new name and type change (->private_data).

Signed-off-by: Rafael Aquini <aquini@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 10 insertions, 10 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index ec0aca8ba6bf..6e9ed48064fc 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -555,7 +555,7 @@ void emergency_thaw_all(void)
  */
 int sync_mapping_buffers(struct address_space *mapping)
 {
-        struct address_space *buffer_mapping = mapping->assoc_mapping;
+        struct address_space *buffer_mapping = mapping->private_data;
 
         if (buffer_mapping == NULL || list_empty(&mapping->private_list))
                 return 0;
@@ -588,10 +588,10 @@ void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
         struct address_space *buffer_mapping = bh->b_page->mapping;
 
         mark_buffer_dirty(bh);
-        if (!mapping->assoc_mapping) {
-                mapping->assoc_mapping = buffer_mapping;
+        if (!mapping->private_data) {
+                mapping->private_data = buffer_mapping;
         } else {
-                BUG_ON(mapping->assoc_mapping != buffer_mapping);
+                BUG_ON(mapping->private_data != buffer_mapping);
         }
         if (!bh->b_assoc_map) {
                 spin_lock(&buffer_mapping->private_lock);
@@ -788,7 +788,7 @@ void invalidate_inode_buffers(struct inode *inode)
         if (inode_has_buffers(inode)) {
                 struct address_space *mapping = &inode->i_data;
                 struct list_head *list = &mapping->private_list;
-                struct address_space *buffer_mapping = mapping->assoc_mapping;
+                struct address_space *buffer_mapping = mapping->private_data;
 
                 spin_lock(&buffer_mapping->private_lock);
                 while (!list_empty(list))
@@ -811,7 +811,7 @@ int remove_inode_buffers(struct inode *inode)
         if (inode_has_buffers(inode)) {
                 struct address_space *mapping = &inode->i_data;
                 struct list_head *list = &mapping->private_list;
-                struct address_space *buffer_mapping = mapping->assoc_mapping;
+                struct address_space *buffer_mapping = mapping->private_data;
 
                 spin_lock(&buffer_mapping->private_lock);
                 while (!list_empty(list)) {
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index e6c2fd53cab2..0f22d09f358d 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -768,7 +768,7 @@ int gfs2_glock_get(struct gfs2_sbd *sdp, u64 number,
                 mapping->host = s->s_bdev->bd_inode;
                 mapping->flags = 0;
                 mapping_set_gfp_mask(mapping, GFP_NOFS);
-                mapping->assoc_mapping = NULL;
+                mapping->private_data = NULL;
                 mapping->backing_dev_info = s->s_bdi;
                 mapping->writeback_index = 0;
         }
diff --git a/fs/inode.c b/fs/inode.c
index 64999f144153..14084b72b259 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -165,7 +165,7 @@ int inode_init_always(struct super_block *sb, struct inode *inode)
         mapping->host = inode;
         mapping->flags = 0;
         mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE);
-        mapping->assoc_mapping = NULL;
+        mapping->private_data = NULL;
         mapping->backing_dev_info = &default_backing_dev_info;
         mapping->writeback_index = 0;
 
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 3e7b2a0dc0c8..07f76db04ec7 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -431,7 +431,7 @@ void nilfs_mapping_init(struct address_space *mapping, struct inode *inode,
         mapping->host = inode;
         mapping->flags = 0;
         mapping_set_gfp_mask(mapping, GFP_NOFS);
-        mapping->assoc_mapping = NULL;
+        mapping->private_data = NULL;
         mapping->backing_dev_info = bdi;
         mapping->a_ops = &empty_aops;
 }
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 75fe9a134803..408fb1e77a0a 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -418,7 +418,7 @@ struct address_space {
         struct backing_dev_info *backing_dev_info; /* device readahead, etc */
         spinlock_t              private_lock;   /* for use by the address_space */
         struct list_head        private_list;   /* ditto */
-        struct address_space    *assoc_mapping; /* ditto */
+        void                    *private_data;  /* ditto */
 } __attribute__((aligned(sizeof(long))));
         /*
          * On most architectures that alignment is already the case; but