From: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Set the file_ra_state->ra_pages in file_ra_state_init() to be at least
mapping_min_order of pages if the bdi->ra_pages is less than that.
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
---
mm/readahead.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/readahead.c b/mm/readahead.c
index ef3b23a41973..5c4e7ee64dc1 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -138,7 +138,13 @@
void
file_ra_state_init(struct file_ra_state *ra, struct address_space *mapping)
{
+ unsigned int order = mapping_min_folio_order(mapping);
+ unsigned int min_nrpages = 1U << order;
+ unsigned int max_pages = inode_to_bdi(mapping->host)->io_pages;
+
ra->ra_pages = inode_to_bdi(mapping->host)->ra_pages;
+ if (ra->ra_pages < min_nrpages && min_nrpages < max_pages)
+ ra->ra_pages = min_nrpages;
ra->prev_pos = -1;
}
EXPORT_SYMBOL_GPL(file_ra_state_init);
--
2.40.1
