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authorLinus Torvalds <torvalds@linux-foundation.org>2019-07-05 11:32:11 +0900
committerLinus Torvalds <torvalds@linux-foundation.org>2019-07-05 11:32:11 +0900
commitcde357c392e93aa7fcfc019403e0d1792081d634 (patch)
tree7d137cd4868622599fca7b4f80cb243432eef58d
parent2cd7cdc7e420a343743db781484e801fd784a1f1 (diff)
parent1571c029a2ff289683ddb0a32253850363bcb8a7 (diff)
Merge tag 'dax-fix-5.2-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull dax fix from Dan Williams: "A single dax fix that has been soaking awaiting other fixes under discussion to join it. As it is getting late in the cycle lets proceed with this fix and save follow-on changes for post-v5.3-rc1. - Fix xarray entry association for mixed mappings" * tag 'dax-fix-5.2-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: dax: Fix xarray entry association for mixed mappings
-rw-r--r--fs/dax.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/dax.c b/fs/dax.c
index 2e48c7ebb973..d2c90bf1969a 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -720,12 +720,11 @@ static void *dax_insert_entry(struct xa_state *xas,
xas_reset(xas);
xas_lock_irq(xas);
- if (dax_entry_size(entry) != dax_entry_size(new_entry)) {
+ if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) {
+ void *old;
+
dax_disassociate_entry(entry, mapping, false);
dax_associate_entry(new_entry, mapping, vmf->vma, vmf->address);
- }
-
- if (dax_is_zero_entry(entry) || dax_is_empty_entry(entry)) {
/*
* Only swap our new entry into the page cache if the current
* entry is a zero page or an empty entry. If a normal PTE or
@@ -734,7 +733,7 @@ static void *dax_insert_entry(struct xa_state *xas,
* existing entry is a PMD, we will just leave the PMD in the
* tree and dirty it if necessary.
*/
- void *old = dax_lock_entry(xas, new_entry);
+ old = dax_lock_entry(xas, new_entry);
WARN_ON_ONCE(old != xa_mk_value(xa_to_value(entry) |
DAX_LOCKED));
entry = new_entry;