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From:   zhanchengbin <zhanchengbin1@huawei.com>
To:     <tytso@mit.edu>
CC:     <linux-ext4@vger.kernel.org>, <linfeilong@huawei.com>,
        <louhongxiang@huawei.com>, <liuzhiqiang26@huawei.com>,
        zhanchengbin <zhanchengbin1@huawei.com>
Subject: [PATCH 1/2] lib/ext2fs: add error handle in unix_flush and unix_write_byte
Date:   Sat, 25 Mar 2023 14:56:51 +0800
Message-ID: <20230325065652.2111384-2-zhanchengbin1@huawei.com>
In-Reply-To: <20230325065652.2111384-1-zhanchengbin1@huawei.com>
References: <20230325065652.2111384-1-zhanchengbin1@huawei.com>
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As you can see, a new error handling has been added for fsync, and the error
handling for unix_write_byte function has reused the error handling of
write_blk.

Signed-off-by: zhanchengbin <zhanchengbin1@huawei.com>
---
 lib/ext2fs/ext2_io.h |  2 ++
 lib/ext2fs/unix_io.c | 37 ++++++++++++++++++++++++++-----------
 2 files changed, 28 insertions(+), 11 deletions(-)

diff --git a/lib/ext2fs/ext2_io.h b/lib/ext2fs/ext2_io.h
index 679184e3..becd7078 100644
--- a/lib/ext2fs/ext2_io.h
+++ b/lib/ext2fs/ext2_io.h
@@ -56,6 +56,8 @@ struct struct_io_channel {
 				       size_t size,
 				       int actual_bytes_written,
 				       errcode_t error);
+	errcode_t       (*sync_error)(io_channel channel,
+	                               errcode_t error);
 	int		refcount;
 	int		flags;
 	long		reserved[14];
diff --git a/lib/ext2fs/unix_io.c b/lib/ext2fs/unix_io.c
index 3171c736..283b4eb6 100644
--- a/lib/ext2fs/unix_io.c
+++ b/lib/ext2fs/unix_io.c
@@ -1250,7 +1250,8 @@ static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
 #ifdef ALIGN_DEBUG
 		printf("unix_write_byte: O_DIRECT fallback\n");
 #endif
-		return EXT2_ET_UNIMPLEMENTED;
+		retval = EXT2_ET_UNIMPLEMENTED;
+		goto error_out;
 	}
 
 #ifndef NO_IO_CACHE
@@ -1258,19 +1259,30 @@ static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
 	 * Flush out the cache completely
 	 */
 	if ((retval = flush_cached_blocks(channel, data, FLUSH_INVALIDATE)))
-		return retval;
+		goto error_out;
 #endif
 
-	if (lseek(data->dev, offset + data->offset, SEEK_SET) < 0)
-		return errno;
+	if (lseek(data->dev, offset + data->offset, SEEK_SET) < 0) {
+		retval = errno;
+		goto error_out;
+	}
 
 	actual = write(data->dev, buf, size);
-	if (actual < 0)
-		return errno;
-	if (actual != size)
-		return EXT2_ET_SHORT_WRITE;
-
+	if (actual < 0) {
+		retval = errno;
+		goto error_out;
+	}
+	if (actual != size) {
+		retval = EXT2_ET_SHORT_WRITE;
+		goto error_out;
+	}
 	return 0;
+error_out:
+	if (channel->write_error)
+		retval = (channel->write_error)(channel,
+					offset / channel->block_size, 0, buf,
+					size, actual, retval);
+	return retval;
 }
 
 /*
@@ -1289,8 +1301,11 @@ static errcode_t unix_flush(io_channel channel)
 	retval = flush_cached_blocks(channel, data, 0);
 #endif
 #ifdef HAVE_FSYNC
-	if (!retval && fsync(data->dev) != 0)
-		return errno;
+	if (!retval && fsync(data->dev) != 0) {
+		if (channel->sync_error)
+			retval = (channel->sync_error)(channel, errno);
+		return retval;
+	}
 #endif
 	return retval;
 }
-- 
2.31.1