linux-ext4 - [RFCv1 09/72] libext2fs: Add flush cleanup API

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Date:   Mon,  7 Nov 2022 17:50:57 +0530
From:   "Ritesh Harjani (IBM)" <ritesh.list@...il.com>
To:     Theodore Ts'o <tytso@....edu>
Cc:     linux-ext4@...r.kernel.org,
        Harshad Shirwadkar <harshadshirwadkar@...il.com>,
        Wang Shilong <wshilong@....com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Li Xi <lixi@....com>, Ritesh Harjani <ritesh.list@...il.com>
Subject: [RFCv1 09/72] libext2fs: Add flush cleanup API

From: Li Xi <lixi@....com>

Signed-off-by: Li Xi <lixi@....com>
Signed-off-by: Wang Shilong <wshilong@....com>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
---
 lib/ext2fs/ext2_io.h |  2 ++
 lib/ext2fs/undo_io.c | 19 +++++++++++++++++++
 lib/ext2fs/unix_io.c | 24 +++++++++++++++++++++---
 3 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/lib/ext2fs/ext2_io.h b/lib/ext2fs/ext2_io.h
index 8fe5b323..8cc355be 100644
--- a/lib/ext2fs/ext2_io.h
+++ b/lib/ext2fs/ext2_io.h
@@ -82,6 +82,7 @@ struct struct_io_manager {
 	errcode_t (*write_blk)(io_channel channel, unsigned long block,
 			       int count, const void *data);
 	errcode_t (*flush)(io_channel channel);
+	errcode_t (*flush_cleanup)(io_channel channel);
 	errcode_t (*write_byte)(io_channel channel, unsigned long offset,
 				int count, const void *data);
 	errcode_t (*set_option)(io_channel channel, const char *option,
@@ -116,6 +117,7 @@ struct struct_io_manager {
 #define io_channel_read_blk(c,b,n,d)	((c)->manager->read_blk((c),b,n,d))
 #define io_channel_write_blk(c,b,n,d)	((c)->manager->write_blk((c),b,n,d))
 #define io_channel_flush(c) 		((c)->manager->flush((c)))
+#define io_channel_flush_cleanup(c) 	((c)->manager->flush_cleanup((c)))
 #define io_channel_bumpcount(c)		((c)->refcount++)
 
 /* io_manager.c */
diff --git a/lib/ext2fs/undo_io.c b/lib/ext2fs/undo_io.c
index f4a6d526..678ff421 100644
--- a/lib/ext2fs/undo_io.c
+++ b/lib/ext2fs/undo_io.c
@@ -1024,6 +1024,24 @@ static errcode_t undo_flush(io_channel channel)
 	return retval;
 }
 
+/*
+ * Flush data buffers to disk and cleanup the cache.
+ */
+static errcode_t undo_flush_cleanup(io_channel channel)
+{
+	errcode_t	retval = 0;
+	struct undo_private_data *data;
+
+	EXT2_CHECK_MAGIC(channel, EXT2_ET_MAGIC_IO_CHANNEL);
+	data = (struct undo_private_data *) channel->private_data;
+	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
+
+	if (data->real)
+		retval = io_channel_flush_cleanup(data->real);
+
+	return retval;
+}
+
 static errcode_t undo_set_option(io_channel channel, const char *option,
 				 const char *arg)
 {
@@ -1095,6 +1113,7 @@ static struct struct_io_manager struct_undo_manager = {
 	.read_blk	= undo_read_blk,
 	.write_blk	= undo_write_blk,
 	.flush		= undo_flush,
+	.flush_cleanup	= undo_flush_cleanup,
 	.write_byte	= undo_write_byte,
 	.set_option	= undo_set_option,
 	.get_stats	= undo_get_stats,
diff --git a/lib/ext2fs/unix_io.c b/lib/ext2fs/unix_io.c
index 5b894826..8f8118a3 100644
--- a/lib/ext2fs/unix_io.c
+++ b/lib/ext2fs/unix_io.c
@@ -1173,9 +1173,9 @@ static errcode_t unix_write_byte(io_channel channel, unsigned long offset,
 }
 
 /*
- * Flush data buffers to disk.
+ * Flush data buffers to disk and invalidate cache if needed
  */
-static errcode_t unix_flush(io_channel channel)
+static errcode_t _unix_flush(io_channel channel, int invalidate)
 {
 	struct unix_private_data *data;
 	errcode_t retval = 0;
@@ -1185,7 +1185,7 @@ static errcode_t unix_flush(io_channel channel)
 	EXT2_CHECK_MAGIC(data, EXT2_ET_MAGIC_UNIX_IO_CHANNEL);
 
 #ifndef NO_IO_CACHE
-	retval = flush_cached_blocks(channel, data, 0);
+	retval = flush_cached_blocks(channel, data, invalidate);
 #endif
 #ifdef HAVE_FSYNC
 	if (!retval && fsync(data->dev) != 0)
@@ -1194,6 +1194,22 @@ static errcode_t unix_flush(io_channel channel)
 	return retval;
 }
 
+/*
+ * Flush data buffers to disk.
+ */
+static errcode_t unix_flush(io_channel channel)
+{
+	return _unix_flush(channel, 0);
+}
+
+/*
+ * Flush data buffers to disk and invalidate cache.
+ */
+static errcode_t unix_flush_cleanup(io_channel channel)
+{
+	return _unix_flush(channel, 1);
+}
+
 static errcode_t unix_set_option(io_channel channel, const char *option,
 				 const char *arg)
 {
@@ -1383,6 +1399,7 @@ static struct struct_io_manager struct_unix_manager = {
 	.discard	= unix_discard,
 	.cache_readahead	= unix_cache_readahead,
 	.zeroout	= unix_zeroout,
+	.flush_cleanup	= unix_flush_cleanup,
 };
 
 io_manager unix_io_manager = &struct_unix_manager;
@@ -1404,6 +1421,7 @@ static struct struct_io_manager struct_unixfd_manager = {
 	.discard	= unix_discard,
 	.cache_readahead	= unix_cache_readahead,
 	.zeroout	= unix_zeroout,
+	.flush_cleanup	= unix_flush_cleanup,
 };
 
 io_manager unixfd_io_manager = &struct_unixfd_manager;
-- 
2.37.3