nfs: teach the NFS client how to treat PG_swapcache pages

Replace all relevant occurences of page->index and page->mapping in the
NFS client with the new page_file_index() and page_file_mapping()
functions.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Eric B Munson <emunson@mgebm.net>
Cc: Eric Paris <eparis@redhat.com>
Cc: James Morris <jmorris@namei.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Cc: Neil Brown <neilb@suse.de>
Cc: Sebastian Andrzej Siewior <sebastian@breakpoint.cc>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Xiaotian Feng <dfeng@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 18 insertions, 18 deletions

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index f312860c15d0..d0feca32b4fe 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -153,7 +153,7 @@ static struct nfs_page *nfs_page_find_request_locked(struct page *page)
 
 static struct nfs_page *nfs_page_find_request(struct page *page)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode = page_file_mapping(page)->host;
         struct nfs_page *req = NULL;
 
         spin_lock(&inode->i_lock);
@@ -165,16 +165,16 @@ static struct nfs_page *nfs_page_find_request(struct page *page)
 /* Adjust the file length if we're writing beyond the end */
 static void nfs_grow_file(struct page *page, unsigned int offset, unsigned int count)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode = page_file_mapping(page)->host;
         loff_t end, i_size;
         pgoff_t end_index;
 
         spin_lock(&inode->i_lock);
         i_size = i_size_read(inode);
         end_index = (i_size - 1) >> PAGE_CACHE_SHIFT;
-        if (i_size > 0 && page->index < end_index)
+        if (i_size > 0 && page_file_index(page) < end_index)
                 goto out;
-        end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + ((loff_t)offset+count);
+        end = page_file_offset(page) + ((loff_t)offset+count);
         if (i_size >= end)
                 goto out;
         i_size_write(inode, end);
@@ -187,7 +187,7 @@ out:
 static void nfs_set_pageerror(struct page *page)
 {
         SetPageError(page);
-        nfs_zap_mapping(page->mapping->host, page->mapping);
+        nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
 }
 
 /* We can set the PG_uptodate flag if we see that a write request
@@ -228,7 +228,7 @@ static int nfs_set_page_writeback(struct page *page)
         int ret = test_set_page_writeback(page);
 
         if (!ret) {
-                struct inode *inode = page->mapping->host;
+                struct inode *inode = page_file_mapping(page)->host;
                 struct nfs_server *nfss = NFS_SERVER(inode);
 
                 if (atomic_long_inc_return(&nfss->writeback) >
@@ -242,7 +242,7 @@ static int nfs_set_page_writeback(struct page *page)
 
 static void nfs_end_page_writeback(struct page *page)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode = page_file_mapping(page)->host;
         struct nfs_server *nfss = NFS_SERVER(inode);
 
         end_page_writeback(page);
@@ -252,7 +252,7 @@ static void nfs_end_page_writeback(struct page *page)
 
 static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode = page_file_mapping(page)->host;
         struct nfs_page *req;
         int ret;
 
@@ -313,13 +313,13 @@ out:
 
 static int nfs_do_writepage(struct page *page, struct writeback_control *wbc, struct nfs_pageio_descriptor *pgio)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode = page_file_mapping(page)->host;
         int ret;
 
         nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGE);
         nfs_add_stats(inode, NFSIOS_WRITEPAGES, 1);
 
-        nfs_pageio_cond_complete(pgio, page->index);
+        nfs_pageio_cond_complete(pgio, page_file_index(page));
         ret = nfs_page_async_flush(pgio, page, wbc->sync_mode == WB_SYNC_NONE);
         if (ret == -EAGAIN) {
                 redirty_page_for_writepage(wbc, page);
@@ -336,7 +336,7 @@ static int nfs_writepage_locked(struct page *page, struct writeback_control *wbc
         struct nfs_pageio_descriptor pgio;
         int err;
 
-        NFS_PROTO(page->mapping->host)->write_pageio_init(&pgio,
+        NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
                                                           page->mapping->host,
                                                           wb_priority(wbc),
                                                           &nfs_async_write_completion_ops);
@@ -471,7 +471,7 @@ nfs_request_add_commit_list(struct nfs_page *req, struct list_head *dst,
         spin_unlock(cinfo->lock);
         if (!cinfo->dreq) {
                 inc_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
-                inc_bdi_stat(req->wb_page->mapping->backing_dev_info,
+                inc_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
                              BDI_RECLAIMABLE);
                 __mark_inode_dirty(req->wb_context->dentry->d_inode,
                                    I_DIRTY_DATASYNC);
@@ -538,7 +538,7 @@ static void
 nfs_clear_page_commit(struct page *page)
 {
         dec_zone_page_state(page, NR_UNSTABLE_NFS);
-        dec_bdi_stat(page->mapping->backing_dev_info, BDI_RECLAIMABLE);
+        dec_bdi_stat(page_file_mapping(page)->backing_dev_info, BDI_RECLAIMABLE);
 }
 
 static void
@@ -789,7 +789,7 @@ out_err:
 static struct nfs_page * nfs_setup_write_request(struct nfs_open_context* ctx,
                 struct page *page, unsigned int offset, unsigned int bytes)
 {
-        struct inode *inode = page->mapping->host;
+        struct inode *inode = page_file_mapping(page)->host;
         struct nfs_page *req;
 
         req = nfs_try_to_update_request(inode, page, offset, bytes);
@@ -842,7 +842,7 @@ int nfs_flush_incompatible(struct file *file, struct page *page)
                 nfs_release_request(req);
                 if (!do_flush)
                         return 0;
-                status = nfs_wb_page(page->mapping->host, page);
+                status = nfs_wb_page(page_file_mapping(page)->host, page);
         } while (status == 0);
         return status;
 }
@@ -872,7 +872,7 @@ int nfs_updatepage(struct file *file, struct page *page,
                 unsigned int offset, unsigned int count)
 {
         struct nfs_open_context *ctx = nfs_file_open_context(file);
-        struct inode    *inode = page->mapping->host;
+        struct inode    *inode = page_file_mapping(page)->host;
         int             status = 0;
 
         nfs_inc_stats(inode, NFSIOS_VFSUPDATEPAGE);
@@ -880,7 +880,7 @@ int nfs_updatepage(struct file *file, struct page *page,
         dprintk("NFS:       nfs_updatepage(%s/%s %d@%lld)\n",
                 file->f_path.dentry->d_parent->d_name.name,
                 file->f_path.dentry->d_name.name, count,
-                (long long)(page_offset(page) + offset));
+                (long long)(page_file_offset(page) + offset));
 
         /* If we're not using byte range locks, and we know the page
          * is up to date, it may be more efficient to extend the write
@@ -1469,7 +1469,7 @@ void nfs_retry_commit(struct list_head *page_list,
                 nfs_mark_request_commit(req, lseg, cinfo);
                 if (!cinfo->dreq) {
                         dec_zone_page_state(req->wb_page, NR_UNSTABLE_NFS);
-                        dec_bdi_stat(req->wb_page->mapping->backing_dev_info,
+                        dec_bdi_stat(page_file_mapping(req->wb_page)->backing_dev_info,
                                      BDI_RECLAIMABLE);
                 }
                 nfs_unlock_and_release_request(req);