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dax: check return value of dax_radix_entry()

Browse source 
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 <[email protected]>
Cc: Dan Williams <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Dave Chinner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ross Zwisler 2016-03-09 14:08:27 -08:00 • committed by Linus Torvalds
commit 30f471fd88
1 changed files with 8 additions and 1 deletions
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9
fs/dax.c
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@ -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);