In recent kernels, radix_tree_root has been replaced by
xarray. lookup_swap_cache() needs to switch depending on what type
i_pages in address_space structure has.
See the following commit of linux kernel git repository for reference:
eb797a8ee0ab4cd03df556980ce7bf167cadaa50
page cache: Rearrange address_space
---
diskdump.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/diskdump.c b/diskdump.c
index 572ef70..88d0dee 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -2657,6 +2657,11 @@ lookup_swap_cache(ulonglong pte_val, unsigned char
*zram_buf)
ulong swp_type, swp_space, page;
struct list_pair lp;
physaddr_t paddr;
+ static int is_xarray = -1;
+
+ if (is_xarray < 0) {
+ is_xarray = STREQ(MEMBER_TYPE_NAME("address_space", "i_pages"),
"xarray");
+ }
swp_type = __swp_type(pte_val);
if (THIS_KERNEL_VERSION >= LINUX(2,6,0)) {
@@ -2675,7 +2680,7 @@ lookup_swap_cache(ulonglong pte_val, unsigned char
*zram_buf)
swp_space += (swp_offset >> SWAP_ADDRESS_SPACE_SHIFT) *
SIZE(address_space);
lp.index = swp_offset;
- if (do_radix_tree(swp_space, RADIX_TREE_SEARCH, &lp)){
+ if ((is_xarray ? do_xarray : do_radix_tree)(swp_space,
RADIX_TREE_SEARCH, &lp)) {
readmem((ulong)lp.value, KVADDR, &page, sizeof(void *),
"swap_cache page", FAULT_ON_ERROR);
if (!is_page_ptr(page, &paddr)) {
--
1.8.3.1
--
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