After moving ext4's bmap to iomap interface, swapon functionality
on files created using fallocate (which creates unwritten extents) are
failing. This is since iomap_bmap interface returns 0 for unwritten
extents and thus generic_swapfile_activate considers this as holes
and hence bail out with below kernel msg :-
[340.915835] swapon: swapfile has holes
To fix this we need to implement ->swap_activate aops in ext4
which will use ext4_iomap_report_ops. Since we only need to return
the list of extents so ext4_iomap_report_ops should be enough.
Reported-by: Yuxuan Shui <yshuiv7@xxxxxxxxx>
Fixes: ac58e4fb03f ("ext4: move ext4 bmap to use iomap infrastructure")
Signed-off-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx>
---
[Tested xfstests with -g swap; Tested stress-ng with --thrash option]
fs/ext4/inode.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 1556cabd3a7d..9ac0f83e6fbe 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3605,6 +3605,13 @@ static int ext4_set_page_dirty(struct page *page)
return __set_page_dirty_buffers(page);
}
+static int ext4_iomap_swap_activate(struct swap_info_struct *sis,
+ struct file *file, sector_t *span)
+{
+ return iomap_swapfile_activate(sis, file, span,
+ &ext4_iomap_report_ops);
+}
+
static const struct address_space_operations ext4_aops = {
.readpage = ext4_readpage,
.readpages = ext4_readpages,
@@ -3620,6 +3627,7 @@ static const struct address_space_operations ext4_aops = {
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
+ .swap_activate = ext4_iomap_swap_activate,
};
static const struct address_space_operations ext4_journalled_aops = {
@@ -3636,6 +3644,7 @@ static const struct address_space_operations ext4_journalled_aops = {
.direct_IO = noop_direct_IO,
.is_partially_uptodate = block_is_partially_uptodate,
.error_remove_page = generic_error_remove_page,
+ .swap_activate = ext4_iomap_swap_activate,
};
static const struct address_space_operations ext4_da_aops = {
@@ -3653,6 +3662,7 @@ static const struct address_space_operations ext4_da_aops = {
.migratepage = buffer_migrate_page,
.is_partially_uptodate = block_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 = {
@@ -3661,6 +3671,7 @@ static const struct address_space_operations ext4_dax_aops = {
.set_page_dirty = noop_set_page_dirty,
.bmap = ext4_bmap,
.invalidatepage = noop_invalidatepage,
+ .swap_activate = ext4_iomap_swap_activate,
};
void ext4_set_aops(struct inode *inode)
--
2.25.1
