Unverified Commit 03ddd772 authored by Matthew Wilcox (Oracle)'s avatar Matthew Wilcox (Oracle) Committed by Christian Brauner
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9p: Add a migrate_folio method 



The migration code used to be able to migrate dirty 9p folios by writing
them back using writepage.  When the writepage method was removed,
we neglected to add a migrate_folio method, which means that dirty 9p
folios have been unmovable ever since.  This reduced our success at
defragmenting memory on machines which use 9p heavily.

Fixes: 80105ed2 (9p: Use netfslib read/write_iter)
Cc: stable@vger.kernel.org
Cc: David Howells <dhowells@redhat.com>
Cc: v9fs@lists.linux.dev
Signed-off-by: default avatar"Matthew Wilcox (Oracle)" <willy@infradead.org>
Link: https://lore.kernel.org/r/20250402150005.2309458-2-willy@infradead.org


Acked-by: default avatarDominique Martinet <asmadeus@codewreck.org>
Reviewed-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarChristian Brauner <brauner@kernel.org>
parent 0af2f6be

fs/9p/vfs_addr.c

+1 −0
Original line number Diff line number Diff line
@@ -164,4 +164,5 @@ const struct address_space_operations v9fs_addr_operations = { 
	.invalidate_folio	= netfs_invalidate_folio,

	.direct_IO		= noop_direct_IO,

	.writepages		= netfs_writepages,

	.migrate_folio		= filemap_migrate_folio,

};