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Subject[PATCH v2 1/4] vfs: track per-sb writeback errors
Date
From: Jeff Layton <jlayton@redhat.com>

Keep a per-sb errseq_t that tracks whether there have been any writeback
errors on this superblock. When an error is recorded for an inode via
mapping_set_error, record it in s_wb_err as well.

Cc: Andres Freund <andres@anarazel.de>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
---
include/linux/fs.h | 3 +++
include/linux/pagemap.h | 5 ++++-
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/include/linux/fs.h b/include/linux/fs.h
index 858dd2f3300c..5378a845ca01 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1446,6 +1446,9 @@ struct super_block {
/* Being remounted read-only */
int s_readonly_remount;

+ /* per-sb errseq_t for reporting writeback errors via syncfs */
+ errseq_t s_wb_err;
+
/* AIO completions deferred from interrupt context */
struct workqueue_struct *s_dio_done_wq;
struct hlist_head s_pins;
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index 442977811b59..c1e36a7b44d2 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -51,7 +51,10 @@ static inline void mapping_set_error(struct address_space *mapping, int error)
return;

/* Record in wb_err for checkers using errseq_t based tracking */
- filemap_set_wb_err(mapping, error);
+ __filemap_set_wb_err(mapping, error);
+
+ /* Record it in superblock */
+ errseq_set(&mapping->host->i_sb->s_wb_err, error);

/* Record it in flags for now, for legacy callers */
if (error == -ENOSPC)
--
2.17.1
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