nfs: ensure correct writeback errors are returned on close()

nfs_wb_all() calls filemap_write_and_wait(), which uses
filemap_check_errors() to determine the error to return.
filemap_check_errors() only looks at the mapping->flags and will
therefore only return either -ENOSPC or -EIO.  To ensure that the
correct error is returned on close(), nfs{,4}_file_flush() should call
filemap_check_wb_err() which looks at the errseq value in
mapping->wb_err without consuming it.

Fixes: 6fbda89b257f ("NFS: Replace custom error reporting mechanism with
generic one")
Signed-off-by: Scott Mayhew <smayhew@redhat.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index ccd6c16..bb244fc 100644 (file)
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -141,6 +141,7 @@ static int
 nfs_file_flush(struct file *file, fl_owner_t id)
 {
        struct inode    *inode = file_inode(file);
+       errseq_t since;
 
        dprintk("NFS: flush(%pD2)\n", file);
 
@@ -149,7 +150,9 @@ nfs_file_flush(struct file *file, fl_owner_t id)
                return 0;
 
        /* Flush writes to the server and return any errors */
-       return nfs_wb_all(inode);
+       since = filemap_sample_wb_err(file->f_mapping);
+       nfs_wb_all(inode);
+       return filemap_check_wb_err(file->f_mapping, since);
 }
 
 ssize_t

diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c
index 8e5d622..a339707 100644 (file)
--- a/fs/nfs/nfs4file.c
+++ b/fs/nfs/nfs4file.c
@@ -110,6 +110,7 @@ static int
 nfs4_file_flush(struct file *file, fl_owner_t id)
 {
        struct inode    *inode = file_inode(file);
+       errseq_t since;
 
        dprintk("NFS: flush(%pD2)\n", file);
 
@@ -125,7 +126,9 @@ nfs4_file_flush(struct file *file, fl_owner_t id)
                return filemap_fdatawrite(file->f_mapping);
 
        /* Flush writes to the server and return any errors */
-       return nfs_wb_all(inode);
+       since = filemap_sample_wb_err(file->f_mapping);
+       nfs_wb_all(inode);
+       return filemap_check_wb_err(file->f_mapping, since);
 }
 
 #ifdef CONFIG_NFS_V4_2