fs/9p: Move writeback fid to v9fs_inode

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

5 files changed, 41 insertions, 24 deletions

diff --git a/fs/9p/v9fs.h b/fs/9p/v9fs.h
index ce59d1512062..71cab8e3a570 100644
--- a/fs/9p/v9fs.h
+++ b/fs/9p/v9fs.h
@@ -122,6 +122,7 @@ struct v9fs_inode {
         struct fscache_cookie *fscache;
         struct p9_qid *fscache_key;
 #endif
+        struct p9_fid *writeback_fid;
         struct inode vfs_inode;
 };
 
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 566684ce55e2..ee455526ca5b 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -163,8 +163,10 @@ static int v9fs_vfs_writepage_locked(struct page *page)
         int retval, len;
         loff_t offset, size;
         mm_segment_t old_fs;
+        struct v9fs_inode *v9inode;
         struct inode *inode = page->mapping->host;
 
+        v9inode = V9FS_I(inode);
         size = i_size_read(inode);
         if (page->index == size >> PAGE_CACHE_SHIFT)
                 len = size & ~PAGE_CACHE_MASK;
@@ -178,11 +180,11 @@ static int v9fs_vfs_writepage_locked(struct page *page)
 
         old_fs = get_fs();
         set_fs(get_ds());
-        /* We should have i_private always set */
-        BUG_ON(!inode->i_private);
+        /* We should have writeback_fid always set */
+        BUG_ON(!v9inode->writeback_fid);
 
         retval = v9fs_file_write_internal(inode,
-                                          (struct p9_fid *)inode->i_private,
+                                          v9inode->writeback_fid,
                                           (__force const char __user *)buffer,
                                           len, &offset, 0);
         if (retval > 0)
@@ -274,23 +276,25 @@ static int v9fs_write_begin(struct file *filp, struct address_space *mapping,
 {
         int retval = 0;
         struct page *page;
+        struct v9fs_inode *v9inode;
         pgoff_t index = pos >> PAGE_CACHE_SHIFT;
         struct inode *inode = mapping->host;
 
+        v9inode = V9FS_I(inode);
 start:
         page = grab_cache_page_write_begin(mapping, index, flags);
         if (!page) {
                 retval = -ENOMEM;
                 goto out;
         }
-        BUG_ON(!inode->i_private);
+        BUG_ON(!v9inode->writeback_fid);
         if (PageUptodate(page))
                 goto out;
 
         if (len == PAGE_CACHE_SIZE)
                 goto out;
 
-        retval = v9fs_fid_readpage(inode->i_private, page);
+        retval = v9fs_fid_readpage(v9inode->writeback_fid, page);
         page_cache_release(page);
         if (!retval)
                 goto start;
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index f7b571ddf99e..98c4307a1f03 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -56,11 +56,13 @@ static const struct vm_operations_struct v9fs_file_vm_ops;
 int v9fs_file_open(struct inode *inode, struct file *file)
 {
         int err;
+        struct v9fs_inode *v9inode;
         struct v9fs_session_info *v9ses;
         struct p9_fid *fid;
         int omode;
 
         P9_DPRINTK(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
+        v9inode = V9FS_I(inode);
         v9ses = v9fs_inode2v9ses(inode);
         if (v9fs_proto_dotl(v9ses))
                 omode = file->f_flags;
@@ -88,9 +90,9 @@ int v9fs_file_open(struct inode *inode, struct file *file)
         }
 
         file->private_data = fid;
-        if (v9ses->cache && !inode->i_private) {
+        if (v9ses->cache && !v9inode->writeback_fid) {
                 /*
-                 * clone a fid and add it to inode->i_private
+                 * clone a fid and add it to writeback_fid
                  * we do it during open time instead of
                  * page dirty time via write_begin/page_mkwrite
                  * because we want write after unlink usecase
@@ -101,7 +103,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
                         err = PTR_ERR(fid);
                         goto out_error;
                 }
-                inode->i_private = (void *) fid;
+                v9inode->writeback_fid = (void *) fid;
         }
 #ifdef CONFIG_9P_FSCACHE
         if (v9ses->cache)
@@ -550,6 +552,7 @@ v9fs_file_mmap(struct file *file, struct vm_area_struct *vma)
 static int
 v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
+        struct v9fs_inode *v9inode;
         struct page *page = vmf->page;
         struct file *filp = vma->vm_file;
         struct inode *inode = filp->f_path.dentry->d_inode;
@@ -558,9 +561,10 @@ v9fs_vm_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
         P9_DPRINTK(P9_DEBUG_VFS, "page %p fid %lx\n",
                    page, (unsigned long)filp->private_data);
 
+        v9inode = V9FS_I(inode);
         /* make sure the cache has finished storing the page */
         v9fs_fscache_wait_on_page_write(inode, page);
-        BUG_ON(!inode->i_private);
+        BUG_ON(!v9inode->writeback_fid);
         lock_page(page);
         if (page->mapping != inode->i_mapping)
                 goto out_unlock;
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 411c70a88b36..fdc086d07447 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -219,6 +219,7 @@ struct inode *v9fs_alloc_inode(struct super_block *sb)
         v9inode->fscache_key = NULL;
         spin_lock_init(&v9inode->fscache_lock);
 #endif
+        v9inode->writeback_fid = NULL;
         return &v9inode->vfs_inode;
 }
 
@@ -414,6 +415,8 @@ error:
  */
 void v9fs_evict_inode(struct inode *inode)
 {
+        struct v9fs_inode *v9inode = V9FS_I(inode);
+
         truncate_inode_pages(inode->i_mapping, 0);
         end_writeback(inode);
         filemap_fdatawrite(inode->i_mapping);
@@ -421,10 +424,10 @@ void v9fs_evict_inode(struct inode *inode)
 #ifdef CONFIG_9P_FSCACHE
         v9fs_cache_inode_put_cookie(inode);
 #endif
-        /* clunk the fid stashed in inode->i_private */
-        if (inode->i_private) {
-                p9_client_clunk((struct p9_fid *)inode->i_private);
-                inode->i_private = NULL;
+        /* clunk the fid stashed in writeback_fid */
+        if (v9inode->writeback_fid) {
+                p9_client_clunk(v9inode->writeback_fid);
+                v9inode->writeback_fid = NULL;
         }
 }
 
@@ -607,9 +610,10 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
         int err;
         u32 perm;
         int flags;
+        struct file *filp;
+        struct v9fs_inode *v9inode;
         struct v9fs_session_info *v9ses;
         struct p9_fid *fid, *inode_fid;
-        struct file *filp;
 
         err = 0;
         fid = NULL;
@@ -631,9 +635,10 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
 
         /* if we are opening a file, assign the open fid to the file */
         if (nd && nd->flags & LOOKUP_OPEN) {
-                if (v9ses->cache && !dentry->d_inode->i_private) {
+                v9inode = V9FS_I(dentry->d_inode);
+                if (v9ses->cache && !v9inode->writeback_fid) {
                         /*
-                         * clone a fid and add it to inode->i_private
+                         * clone a fid and add it to writeback_fid
                          * we do it during open time instead of
                          * page dirty time via write_begin/page_mkwrite
                          * because we want write after unlink usecase
@@ -644,7 +649,7 @@ v9fs_vfs_create(struct inode *dir, struct dentry *dentry, int mode,
                                 err = PTR_ERR(inode_fid);
                                 goto error;
                         }
-                        dentry->d_inode->i_private = (void *) inode_fid;
+                        v9inode->writeback_fid = (void *) inode_fid;
                 }
                 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
                 if (IS_ERR(filp)) {
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 21523f27f5d1..984594123abe 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -159,16 +159,17 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
                 struct nameidata *nd)
 {
         int err = 0;
-        char *name = NULL;
         gid_t gid;
         int flags;
         mode_t mode;
-        struct v9fs_session_info *v9ses;
-        struct p9_fid *fid = NULL;
-        struct p9_fid *dfid, *ofid, *inode_fid;
+        char *name = NULL;
         struct file *filp;
         struct p9_qid qid;
         struct inode *inode;
+        struct p9_fid *fid = NULL;
+        struct v9fs_inode *v9inode;
+        struct p9_fid *dfid, *ofid, *inode_fid;
+        struct v9fs_session_info *v9ses;
         struct posix_acl *pacl = NULL, *dacl = NULL;
 
         v9ses = v9fs_inode2v9ses(dir);
@@ -241,9 +242,11 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
 
         /* Now set the ACL based on the default value */
         v9fs_set_create_acl(dentry, dacl, pacl);
-        if (v9ses->cache && !inode->i_private) {
+
+        v9inode = V9FS_I(inode);
+        if (v9ses->cache && !v9inode->writeback_fid) {
                 /*
-                 * clone a fid and add it to inode->i_private
+                 * clone a fid and add it to writeback_fid
                  * we do it during open time instead of
                  * page dirty time via write_begin/page_mkwrite
                  * because we want write after unlink usecase
@@ -254,7 +257,7 @@ v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
                         err = PTR_ERR(inode_fid);
                         goto error;
                 }
-                inode->i_private = (void *) inode_fid;
+                v9inode->writeback_fid = (void *) inode_fid;
         }
         /* Since we are opening a file, assign the open fid to the file */
         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);