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authorRoss Zwisler <ross.zwisler@linux.intel.com>2016-03-09 14:08:27 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-09 15:43:42 -0800
commit30f471fd88e0304bee2c17ef1a4651e705870817 (patch)
tree0fe15e01cee010e6b4461f0da76092f68d1bba32 /fs/dax.c
parent566e8dfd88d9e0d12873ca69c26e82c0af8479d8 (diff)
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@linux.intel.com> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Matthew Wilcox <willy@linux.intel.com> Cc: Dave Chinner <david@fromorbit.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/dax.c')
-rw-r--r--fs/dax.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/dax.c b/fs/dax.c
index 711172450da6..bbb2ad783770 100644
--- a/fs/dax.c
+++ b/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_struct *vma, struct vm_fault *vmf)
* 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);