[PATCH v7 05/12] fs: allow to always dirty inode in __generic_write_end

[Andreas Gruenbacher <agruenba@xxxxxxxxxx>]

In __generic_write_end, we usually dirty the inode only when the file
size changes.  Allow to dirty the inode even when the file size stays
the same; this will be used when writing to inline data stored in the
inode.

Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx>
---
 fs/buffer.c   | 9 ++++-----
 fs/internal.h | 2 +-
 2 files changed, 5 insertions(+), 6 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index cb5bbf22b1ce..a59d281ca51e 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2078,10 +2078,9 @@ int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
 EXPORT_SYMBOL(block_write_begin);
 
 int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
-		struct page *page)
+		struct page *page, bool dirty_inode)
 {
 	loff_t old_size = inode->i_size;
-	bool i_size_changed = false;
 
 	/*
 	 * No need to use i_size_read() here, the i_size cannot change under us
@@ -2092,7 +2091,7 @@ int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
 	 */
 	if (pos + copied > inode->i_size) {
 		i_size_write(inode, pos + copied);
-		i_size_changed = true;
+		dirty_inode = true;
 	}
 
 	unlock_page(page);
@@ -2106,7 +2105,7 @@ int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
 	 * ordering of page lock and transaction start for journaling
 	 * filesystems.
 	 */
-	if (i_size_changed)
+	if (dirty_inode)
 		mark_inode_dirty(inode);
 	return copied;
 }
@@ -2152,7 +2151,7 @@ int generic_write_end(struct file *file, struct address_space *mapping,
 			struct page *page, void *fsdata)
 {
 	copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
-	return __generic_write_end(mapping->host, pos, copied, page);
+	return __generic_write_end(mapping->host, pos, copied, page, false);
 }
 EXPORT_SYMBOL(generic_write_end);
 
diff --git a/fs/internal.h b/fs/internal.h
index 4a18bdbd2214..8572af552285 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -44,7 +44,7 @@ extern void guard_bio_eod(int rw, struct bio *bio);
 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
 		get_block_t *get_block, struct iomap *iomap);
 int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
-		struct page *page);
+		struct page *page, bool dirty_inode);
 
 /*
  * char_dev.c
-- 
2.17.0