The patch titled
Subject: dax: check return value of dax_radix_entry()
has been removed from the -mm tree. Its filename was
dax-check-return-value-of-dax_radix_entry.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Subject: dax: check return value of dax_radix_entry()
dax_pfn_mkwrite() previously wasn't checking the return value of the call
to dax_radix_entry(), which was a mistake.
Instead, capture this return value and return the appropriate VM_FAULT_
value.
Signed-off-by: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/dax.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff -puN fs/dax.c~dax-check-return-value-of-dax_radix_entry fs/dax.c
--- a/fs/dax.c~dax-check-return-value-of-dax_radix_entry
+++ a/fs/dax.c
@@ -1056,6 +1056,7 @@ EXPORT_SYMBOL_GPL(dax_pmd_fault);
int dax_pfn_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct file *file = vma->vm_file;
+ int error;
/*
* We pass NO_SECTOR to dax_radix_entry() because we expect that a
@@ -1065,7 +1066,13 @@ int dax_pfn_mkwrite(struct vm_area_struc
* saves us from having to make a call to get_block() here to look
* up the sector.
*/
- dax_radix_entry(file->f_mapping, vmf->pgoff, NO_SECTOR, false, true);
+ error = dax_radix_entry(file->f_mapping, vmf->pgoff, NO_SECTOR, false,
+ true);
+
+ if (error == -ENOMEM)
+ return VM_FAULT_OOM;
+ if (error)
+ return VM_FAULT_SIGBUS;
return VM_FAULT_NOPAGE;
}
EXPORT_SYMBOL_GPL(dax_pfn_mkwrite);
_
Patches currently in -mm which might be from ross.zwisler@xxxxxxxxxxxxxxx are
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