linux-kernel - [PATCH v5 06/17] fs: adapt sync_file_range to new reporting infrastructure

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Date:   Wed, 31 May 2017 08:45:29 -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
Cc:     linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: [PATCH v5 06/17] fs: adapt sync_file_range to new reporting infrastructure

Since it returns errors in a way similar to fsync, have it use the same
method for returning previously-reported writeback errors.

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/sync.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/fs/sync.c b/fs/sync.c
index ec93aac4feb9..819a81526714 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -275,8 +275,11 @@ SYSCALL_DEFINE1(fdatasync, unsigned int, fd)
  *
  *
  * SYNC_FILE_RANGE_WAIT_BEFORE and SYNC_FILE_RANGE_WAIT_AFTER will detect any
- * I/O errors or ENOSPC conditions and will return those to the caller, after
- * clearing the EIO and ENOSPC flags in the address_space.
+ * error condition that occurred prior to or after writeback, and will return
+ * that to the caller, while advancing the file's errseq_t cursor. Note that
+ * any errors returned here may have occurred in an area of the file that is
+ * not covered by the given range as most filesystems track writeback errors
+ * on a per-address_space basis
  *
  * It should be noted that none of these operations write out the file's
  * metadata.  So unless the application is strictly performing overwrites of
@@ -343,19 +346,25 @@ SYSCALL_DEFINE4(sync_file_range, int, fd, loff_t, offset, loff_t, nbytes,
 	if (flags & SYNC_FILE_RANGE_WAIT_BEFORE) {
 		ret = filemap_fdatawait_range(mapping, offset, endbyte);
 		if (ret < 0)
-			goto out_put;
+			goto out_report;
 	}
 
 	if (flags & SYNC_FILE_RANGE_WRITE) {
 		ret = __filemap_fdatawrite_range(mapping, offset, endbyte,
 						 WB_SYNC_NONE);
 		if (ret < 0)
-			goto out_put;
+			goto out_report;
 	}
 
 	if (flags & SYNC_FILE_RANGE_WAIT_AFTER)
 		ret = filemap_fdatawait_range(mapping, offset, endbyte);
 
+out_report:
+	if (mapping->host->i_sb->s_type->fs_flags & FS_WB_ERRSEQ) {
+		int ret2 = filemap_report_wb_err(f.file);
+		if (!ret)
+			ret = ret2;
+	}
 out_put:
 	fdput(f);
 out:
-- 
2.9.4