[PATCH 5/5] nilfs2: do not propagate ENOENT error from nilfs_sufile_mark_dirty()

[Ryusuke Konishi <konishi.ryusuke@gmail.com>]

nilfs_sufile_mark_dirty(), which marks a block in the sufile metadata
file as dirty in preparation for log writing, returns -ENOENT to the
caller if the block containing the segment usage of the specified
segment is missing.

This internal code can propagate through the log writer to system
calls such as fsync.  To prevent this, treat this case as a filesystem
error and return -EIO instead.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
---
 fs/nilfs2/sufile.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index f071eba48163..eea5a6a12f7b 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -513,8 +513,15 @@ int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
 
 	down_write(&NILFS_MDT(sufile)->mi_sem);
 	ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
-	if (ret)
+	if (unlikely(ret)) {
+		if (ret == -ENOENT) {
+			nilfs_error(sufile->i_sb,
+				    "segment usage for segment %llu is unreadable due to a hole block",
+				    (unsigned long long)segnum);
+			ret = -EIO;
+		}
 		goto out_sem;
+	}
 
 	kaddr = kmap_local_page(bh->b_page);
 	su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
-- 
2.34.1