[PATCH v5 27/40] netfs: Allocate multipage folios in the writepath
From: David Howells <dhowells@redhat.com>
Date: 2023-12-21 13:25:53
Also in:
ceph-devel, linux-cifs, linux-fsdevel, linux-mm, linux-nfs, lkml, v9fs
Subsystem:
filesystems (vfs and infrastructure), filesystems [netfs library], the rest · Maintainers:
Alexander Viro, Christian Brauner, David Howells, Paulo Alcantara, Linus Torvalds
Allocate a multipage folio when copying data into the pagecache if possible if there's sufficient data to warrant it. Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Jeff Layton <jlayton@kernel.org> cc: linux-cachefs@redhat.com cc: linux-fsdevel@vger.kernel.org cc: linux-mm@kvack.org --- fs/netfs/buffered_write.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index 6e7f06d9962d..b76688e98f81 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c@@ -84,14 +84,19 @@ static enum netfs_how_to_modify netfs_how_to_modify(struct netfs_inode *ctx, } /* - * Grab a folio for writing and lock it. + * Grab a folio for writing and lock it. Attempt to allocate as large a folio + * as possible to hold as much of the remaining length as possible in one go. */ static struct folio *netfs_grab_folio_for_write(struct address_space *mapping, loff_t pos, size_t part) { pgoff_t index = pos / PAGE_SIZE; + fgf_t fgp_flags = FGP_WRITEBEGIN; - return __filemap_get_folio(mapping, index, FGP_WRITEBEGIN, + if (mapping_large_folio_support(mapping)) + fgp_flags |= fgf_set_order(pos % PAGE_SIZE + part); + + return __filemap_get_folio(mapping, index, fgp_flags, mapping_gfp_mask(mapping)); }