From cd9ae2b6a75bb1fa0d370929c2d7a7da1ed719d9 Mon Sep 17 00:00:00 2001
From: Trond Myklebust <Trond.Myklebust@netapp.com>
Date: Thu, 19 Oct 2006 23:28:40 -0700
Subject: [PATCH] NFS: Deal with failure of invalidate_inode_pages2()

If invalidate_inode_pages2() fails, then it should in principle just be
because the current process was signalled.  In that case, we just want to
ensure that the inode's page cache remains marked as invalid.

Also add a helper to allow the O_DIRECT code to simply mark the page cache as
invalid once it is finished writing, instead of calling
invalidate_inode_pages2() itself.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 481f889..58d4405 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -203,8 +203,10 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
 	 * Note: assumes we have exclusive access to this mapping either
 	 *	 through inode->i_mutex or some other mechanism.
 	 */
-	if (page->index == 0)
-		invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1);
+	if (page->index == 0 && invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1) < 0) {
+		/* Should never happen */
+		nfs_zap_mapping(inode, inode->i_mapping);
+	}
 	unlock_page(page);
 	return 0;
  error:
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index 1e873fc..bdfabf8 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -497,6 +497,7 @@ static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode
 			if (dreq->commit_data != NULL)
 				nfs_commit_free(dreq->commit_data);
 			nfs_direct_free_writedata(dreq);
+			nfs_zap_mapping(inode, inode->i_mapping);
 			nfs_direct_complete(dreq);
 	}
 }
@@ -517,6 +518,7 @@ static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode
 {
 	nfs_end_data_update(inode);
 	nfs_direct_free_writedata(dreq);
+	nfs_zap_mapping(inode, inode->i_mapping);
 	nfs_direct_complete(dreq);
 }
 #endif
@@ -830,17 +832,6 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
 
 	retval = nfs_direct_write(iocb, (unsigned long) buf, count, pos);
 
-	/*
-	 * XXX: nfs_end_data_update() already ensures this file's
-	 *      cached data is subsequently invalidated.  Do we really
-	 *      need to call invalidate_inode_pages2() again here?
-	 *
-	 *      For aio writes, this invalidation will almost certainly
-	 *      occur before the writes complete.  Kind of racey.
-	 */
-	if (mapping->nrpages)
-		invalidate_inode_pages2(mapping);
-
 	if (retval > 0)
 		iocb->ki_pos = pos + retval;
 
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index bc9376c..9979ad1 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -131,6 +131,15 @@ void nfs_zap_caches(struct inode *inode)
 	spin_unlock(&inode->i_lock);
 }
 
+void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
+{
+	if (mapping->nrpages != 0) {
+		spin_lock(&inode->i_lock);
+		NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
+		spin_unlock(&inode->i_lock);
+	}
+}
+
 static void nfs_zap_acl_cache(struct inode *inode)
 {
 	void (*clear_acl_cache)(struct inode *);
@@ -671,13 +680,20 @@ int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
 	if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
 			|| nfs_attribute_timeout(inode))
 		ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+	if (ret < 0)
+		goto out;
 
 	if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
-		nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
-		if (S_ISREG(inode->i_mode))
-			nfs_sync_mapping(mapping);
-		invalidate_inode_pages2(mapping);
-
+		if (mapping->nrpages != 0) {
+			if (S_ISREG(inode->i_mode)) {
+				ret = nfs_sync_mapping(mapping);
+				if (ret < 0)
+					goto out;
+			}
+			ret = invalidate_inode_pages2(mapping);
+			if (ret < 0)
+				goto out;
+		}
 		spin_lock(&inode->i_lock);
 		nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
 		if (S_ISDIR(inode->i_mode)) {
@@ -687,10 +703,12 @@ int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
 		}
 		spin_unlock(&inode->i_lock);
 
+		nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
 		dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
 				inode->i_sb->s_id,
 				(long long)NFS_FILEID(inode));
 	}
+out:
 	return ret;
 }
 
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 76ff548..6b2de1b 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -290,6 +290,7 @@ static inline int nfs_verify_change_attribute(struct inode *inode, unsigned long
  * linux/fs/nfs/inode.c
  */
 extern int nfs_sync_mapping(struct address_space *mapping);
+extern void nfs_zap_mapping(struct inode *inode, struct address_space *mapping);
 extern void nfs_zap_caches(struct inode *);
 extern struct inode *nfs_fhget(struct super_block *, struct nfs_fh *,
 				struct nfs_fattr *);
-- 
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