On 6/17/2021 6:52 PM, Dave Chinner wrote:
On Thu, Jun 17, 2021 at 10:16:58AM -0500, Alex Sierra wrote:
From: Ralph Campbell <rcampbell@xxxxxxxxxx>
There are several places where ZONE_DEVICE struct pages assume a reference
count == 1 means the page is idle and free. Instead of open coding this,
add a helper function to hide this detail.
v2:
[AS]: rename dax_layout_is_idle_page func to dax_page_unused
Did you even compile test this?
Thanks for catching this Dave, my mistake, I was building without
CONFIG_FS_DAX, as I was using DEVICE_GENERIC only.
I'll send the corrected patch in replay.
Regards,
Alex Sierra
Signed-off-by: Ralph Campbell <rcampbell@xxxxxxxxxx>
Signed-off-by: Alex Sierra <alex.sierra@xxxxxxx>
---
fs/dax.c | 4 ++--
fs/ext4/inode.c | 5 +----
fs/xfs/xfs_file.c | 4 +---
include/linux/dax.h | 10 ++++++++++
4 files changed, 14 insertions(+), 9 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 26d5dcd2d69e..321f4ddc6643 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -358,7 +358,7 @@ static void dax_disassociate_entry(void *entry, struct address_space *mapping,
for_each_mapped_pfn(entry, pfn) {
struct page *page = pfn_to_page(pfn);
- WARN_ON_ONCE(trunc && page_ref_count(page) > 1);
+ WARN_ON_ONCE(trunc && !dax_layout_is_idle_page(page));
Because you still use dax_layout_is_idle_page() here, not
dax_page_unused()...
WARN_ON_ONCE(page->mapping && page->mapping != mapping);
page->mapping = NULL;
page->index = 0;
@@ -372,7 +372,7 @@ static struct page *dax_busy_page(void *entry)
for_each_mapped_pfn(entry, pfn) {
struct page *page = pfn_to_page(pfn);
- if (page_ref_count(page) > 1)
+ if (!dax_layout_is_idle_page(page))
Here too.
Cheers,
Dave.
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