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-rw-r--r--fs/nfs/write.c17
1 files changed, 13 insertions, 4 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 0cf9d1cd9bd2..89527a487ed7 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -174,8 +174,6 @@ static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int
return;
if (count != nfs_page_length(page))
return;
- if (count != PAGE_CACHE_SIZE)
- zero_user_page(page, count, PAGE_CACHE_SIZE - count, KM_USER0);
SetPageUptodate(page);
}
@@ -627,7 +625,8 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
return ERR_PTR(error);
}
spin_unlock(&inode->i_lock);
- return new;
+ req = new;
+ goto zero_page;
}
spin_unlock(&inode->i_lock);
@@ -655,13 +654,23 @@ static struct nfs_page * nfs_update_request(struct nfs_open_context* ctx,
if (offset < req->wb_offset) {
req->wb_offset = offset;
req->wb_pgbase = offset;
- req->wb_bytes = rqend - req->wb_offset;
+ req->wb_bytes = max(end, rqend) - req->wb_offset;
+ goto zero_page;
}
if (end > rqend)
req->wb_bytes = end - req->wb_offset;
return req;
+zero_page:
+ /* If this page might potentially be marked as up to date,
+ * then we need to zero any uninitalised data. */
+ if (req->wb_pgbase == 0 && req->wb_bytes != PAGE_CACHE_SIZE
+ && !PageUptodate(req->wb_page))
+ zero_user_page(req->wb_page, req->wb_bytes,
+ PAGE_CACHE_SIZE - req->wb_bytes,
+ KM_USER0);
+ return req;
}
int nfs_flush_incompatible(struct file *file, struct page *page)
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