[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>

3 files changed, 29 insertions, 18 deletions

diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 481f8892a919..58d44057813e 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 1e873fcab947..bdfabf854a51 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 bc9376ca86cd..9979ad1cf8eb 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;
 }