[PATCH 16/29] fsdax: simplify the offset check in dax_iomap_zero

Christoph Hellwig
2021-11-09T08:33:52Z

The file relative offset must have the same alignment as the storage
offset, so use that and get rid of the call to iomap_sector.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
fs/dax.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 5364549d67a48..d7a923d152240 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -1123,7 +1123,6 @@ static vm_fault_t dax_pmd_load_hole(struct xa_state *xas, struct vm_fault *vmf,

s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
{
- sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
pgoff_t pgoff = dax_iomap_pgoff(iomap, pos);
long rc, id;
void *kaddr;
@@ -1131,8 +1130,7 @@ s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap)
unsigned offset = offset_in_page(pos);
unsigned size = min_t(u64, PAGE_SIZE - offset, length);

- if (IS_ALIGNED(sector << SECTOR_SHIFT, PAGE_SIZE) &&
- (size == PAGE_SIZE))
+ if (IS_ALIGNED(pos, PAGE_SIZE) && size == PAGE_SIZE)
page_aligned = true;

id = dax_read_lock();
--
2.30.2