linux-ext4 - [PATCH v6 15/20] fs: have call_fsync call filemap_report_wb_err if FS_WB

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Date:   Mon, 12 Jun 2017 08:23:11 -0400
From:   Jeff Layton <jlayton@...hat.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...IV.linux.org.uk>, Jan Kara <jack@...e.cz>,
        tytso@....edu, axboe@...nel.dk, mawilcox@...rosoft.com,
        ross.zwisler@...ux.intel.com, corbet@....net,
        Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-btrfs@...r.kernel.org, linux-block@...r.kernel.org
Subject: [PATCH v6 15/20] fs: have call_fsync call filemap_report_wb_err if FS_WB_ERRSEQ is set

Allow filesystems to opt-in to a final check of wb_err if FS_WB_ERRSEQ
is set. Technically, we could just plumb these calls into all of the
fsync operations, but I think this means less code, changes and churn.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 include/linux/fs.h | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 17ba6284ab14..ef3feeec80b2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1742,12 +1742,6 @@ static inline int call_mmap(struct file *file, struct vm_area_struct *vma)
 	return file->f_op->mmap(file, vma);
 }
 
-static inline int call_fsync(struct file *file, loff_t start, loff_t end,
-			     int datasync)
-{
-	return file->f_op->fsync(file, start, end, datasync);
-}
-
 ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector,
 			      unsigned long nr_segs, unsigned long fast_segs,
 			      struct iovec *fast_pointer,
@@ -2583,6 +2577,20 @@ static inline errseq_t filemap_sample_wb_err(struct address_space *mapping)
 	return errseq_sample(&mapping->wb_err);
 }
 
+static inline int call_fsync(struct file *file, loff_t start, loff_t end,
+			     int datasync)
+{
+	int ret;
+
+	ret = file->f_op->fsync(file, start, end, datasync);
+	if (file->f_mapping->host->i_sb->s_type->fs_flags & FS_WB_ERRSEQ) {
+		int ret2 = filemap_report_wb_err(file);
+		if (!ret)
+			ret = ret2;
+	}
+	return ret;
+}
+
 extern int vfs_fsync_range(struct file *file, loff_t start, loff_t end,
 			   int datasync);
 extern int vfs_fsync(struct file *file, int datasync);
-- 
2.13.0