On Mon, May 21, 2018 at 11:39 PM, Souptick Joarder <jrdr.linux@xxxxxxxxx> wrote:
> Use new return type vm_fault_t for fault handler. For
> now, this is just documenting that the function returns
> a VM_FAULT value rather than an errno. Once all instances
> are converted, vm_fault_t will become a distinct type.
>
> Ref-> commit 1c8f422059ae ("mm: change return type to
> vm_fault_t") was added in 4.17-rc1 to introduce the new
> typedef vm_fault_t. Currently we are making change to all
> drivers to return vm_fault_t for page fault handlers. As
> part of that lustre driver is also getting changed to
> return vm_fault_t type.
>
> Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
> ---
> v2: updated the change log
>
> v3: updated the change log
>
> drivers/staging/lustre/lustre/llite/llite_mmap.c | 35 ++++++++++++------------
> 1 file changed, 18 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/staging/lustre/lustre/llite/llite_mmap.c b/drivers/staging/lustre/lustre/llite/llite_mmap.c
> index c0533bd..5b8fd10 100644
> --- a/drivers/staging/lustre/lustre/llite/llite_mmap.c
> +++ b/drivers/staging/lustre/lustre/llite/llite_mmap.c
> @@ -231,7 +231,7 @@ static int ll_page_mkwrite0(struct vm_area_struct *vma, struct page *vmpage,
> return result;
> }
>
> -static inline int to_fault_error(int result)
> +static inline vm_fault_t to_fault_error(int result)
> {
> switch (result) {
> case 0:
> @@ -261,7 +261,7 @@ static inline int to_fault_error(int result)
> * \retval VM_FAULT_ERROR on general error
> * \retval NOPAGE_OOM not have memory for allocate new page
> */
> -static int ll_fault0(struct vm_area_struct *vma, struct vm_fault *vmf)
> +static vm_fault_t ll_fault0(struct vm_area_struct *vma, struct vm_fault *vmf)
> {
> struct lu_env *env;
> struct cl_io *io;
> @@ -269,16 +269,16 @@ static int ll_fault0(struct vm_area_struct *vma, struct vm_fault *vmf)
> struct page *vmpage;
> unsigned long ra_flags;
> int result = 0;
> - int fault_ret = 0;
> + vm_fault_t fault_ret = 0;
> u16 refcheck;
>
> env = cl_env_get(&refcheck);
> if (IS_ERR(env))
> - return PTR_ERR(env);
> + return VM_FAULT_ERROR;
>
> io = ll_fault_io_init(env, vma, vmf->pgoff, &ra_flags);
> if (IS_ERR(io)) {
> - result = to_fault_error(PTR_ERR(io));
> + fault_ret = to_fault_error(PTR_ERR(io));
> goto out;
> }
>
> @@ -319,15 +319,15 @@ static int ll_fault0(struct vm_area_struct *vma, struct vm_fault *vmf)
> if (result != 0 && !(fault_ret & VM_FAULT_RETRY))
> fault_ret |= to_fault_error(result);
>
> - CDEBUG(D_MMAP, "%s fault %d/%d\n", current->comm, fault_ret, result);
> + CDEBUG(D_MMAP, "%s fault %x/%d\n", current->comm, fault_ret, result);
> return fault_ret;
> }
>
> -static int ll_fault(struct vm_fault *vmf)
> +static vm_fault_t ll_fault(struct vm_fault *vmf)
> {
> int count = 0;
> bool printed = false;
> - int result;
> + vm_fault_t result;
> sigset_t set;
>
> /* Only SIGKILL and SIGTERM are allowed for fault/nopage/mkwrite
> @@ -364,18 +364,19 @@ static int ll_fault(struct vm_fault *vmf)
> return result;
> }
>
> -static int ll_page_mkwrite(struct vm_fault *vmf)
> +static vm_fault_t ll_page_mkwrite(struct vm_fault *vmf)
> {
> struct vm_area_struct *vma = vmf->vma;
> int count = 0;
> bool printed = false;
> bool retry;
> - int result;
> + int err;
> + vm_fault_t ret;
>
> file_update_time(vma->vm_file);
> do {
> retry = false;
> - result = ll_page_mkwrite0(vma, vmf->page, &retry);
> + err = ll_page_mkwrite0(vma, vmf->page, &retry);
>
> if (!printed && ++count > 16) {
> const struct dentry *de = vma->vm_file->f_path.dentry;
> @@ -387,25 +388,25 @@ static int ll_page_mkwrite(struct vm_fault *vmf)
> }
> } while (retry);
>
> - switch (result) {
> + switch (err) {
> case 0:
> LASSERT(PageLocked(vmf->page));
> - result = VM_FAULT_LOCKED;
> + ret = VM_FAULT_LOCKED;
> break;
> case -ENODATA:
> case -EAGAIN:
> case -EFAULT:
> - result = VM_FAULT_NOPAGE;
> + ret = VM_FAULT_NOPAGE;
> break;
> case -ENOMEM:
> - result = VM_FAULT_OOM;
> + ret = VM_FAULT_OOM;
> break;
> default:
> - result = VM_FAULT_SIGBUS;
> + ret = VM_FAULT_SIGBUS;
> break;
> }
>
> - return result;
> + return ret;
> }
>
> /**
> --
> 1.9.1
>
If no further comment, we would like to get this patch in 4.18-rc-X.
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