Commit cc7172de authored by Chris Mason's avatar Chris Mason
Browse files

Btrfs: Don't use kmap_atomic(..., KM_IRQ0) during checksum verifies 



Checksum verification happens in a helper thread, and there is no
need to mess with interrupts.  This switches to kmap() instead.

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent 07d400a6

fs/btrfs/inode.c

+3 −7
Original line number Diff line number Diff line
@@ -1727,7 +1727,6 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, 
	int ret;

	struct btrfs_root *root = BTRFS_I(inode)->root;

	u32 csum = ~(u32)0;

	unsigned long flags;



	if (PageChecked(page)) {

		ClearPageChecked(page);
@@ -1749,8 +1748,7 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, 
	} else {

		ret = get_state_private(io_tree, start, &private);

	}

	local_irq_save(flags);

	kaddr = kmap_atomic(page, KM_IRQ0);

	kaddr = kmap(page);

	if (ret)

		goto zeroit;
@@ -1759,8 +1757,7 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, 
	if (csum != private)

		goto zeroit;



	kunmap_atomic(kaddr, KM_IRQ0);

	local_irq_restore(flags);

	kunmap(page);

good:

	/* if the io failure tree for this inode is non-empty,

	 * check to see if we've recovered from a failed IO
@@ -1775,8 +1772,7 @@ static int btrfs_readpage_end_io_hook(struct page *page, u64 start, u64 end, 
	       (unsigned long long)private);

	memset(kaddr + offset, 1, end - start + 1);

	flush_dcache_page(page);

	kunmap_atomic(kaddr, KM_IRQ0);

	local_irq_restore(flags);

	kunmap(page);

	if (private == 0)

		return 0;

	return -EIO;