From: Zhang Yi <yi.zhang@xxxxxxxxxx>
Introduce a new iomap address space operations ext4_iomap_aops that used
to support regular file's buffered IO path. Most of their callbacks have
already been implemented yet, the .read_folio, .readahead and
.writepages should be implemented later.
Signed-off-by: Zhang Yi <yi.zhang@xxxxxxxxxx>
---
fs/ext4/inode.c | 31 +++++++++++++++++++++++++++++++
1 file changed, 31 insertions(+)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e92b205b3b24..4eef3828d5fd 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3525,6 +3525,22 @@ const struct iomap_ops ext4_iomap_report_ops = {
.iomap_begin = ext4_iomap_begin_report,
};
+static int ext4_iomap_read_folio(struct file *file, struct folio *folio)
+{
+ return 0;
+}
+
+static void ext4_iomap_readahead(struct readahead_control *rac)
+{
+
+}
+
+static int ext4_iomap_writepages(struct address_space *mapping,
+ struct writeback_control *wbc)
+{
+ return 0;
+}
+
/*
* For data=journal mode, folio should be marked dirty only when it was
* writeably mapped. When that happens, it was already attached to the
@@ -3614,6 +3630,21 @@ static const struct address_space_operations ext4_da_aops = {
.swap_activate = ext4_iomap_swap_activate,
};
+static const struct address_space_operations ext4_iomap_aops = {
+ .read_folio = ext4_iomap_read_folio,
+ .readahead = ext4_iomap_readahead,
+ .writepages = ext4_iomap_writepages,
+ .dirty_folio = iomap_dirty_folio,
+ .bmap = ext4_bmap,
+ .invalidate_folio = iomap_invalidate_folio,
+ .release_folio = iomap_release_folio,
+ .direct_IO = noop_direct_IO,
+ .migrate_folio = filemap_migrate_folio,
+ .is_partially_uptodate = iomap_is_partially_uptodate,
+ .error_remove_page = generic_error_remove_page,
+ .swap_activate = ext4_iomap_swap_activate,
+};
+
static const struct address_space_operations ext4_dax_aops = {
.writepages = ext4_dax_writepages,
.direct_IO = noop_direct_IO,
--
2.39.2
