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142 lines
3.6 KiB
142 lines
3.6 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
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/* |
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* include/linux/userfaultfd_k.h |
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* |
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* Copyright (C) 2015 Red Hat, Inc. |
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* |
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*/ |
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#ifndef _LINUX_USERFAULTFD_K_H |
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#define _LINUX_USERFAULTFD_K_H |
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#ifdef CONFIG_USERFAULTFD |
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#include <linux/userfaultfd.h> /* linux/include/uapi/linux/userfaultfd.h */ |
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#include <linux/fcntl.h> |
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/* |
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* CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining |
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* new flags, since they might collide with O_* ones. We want |
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* to re-use O_* flags that couldn't possibly have a meaning |
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* from userfaultfd, in order to leave a free define-space for |
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* shared O_* flags. |
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*/ |
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#define UFFD_CLOEXEC O_CLOEXEC |
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#define UFFD_NONBLOCK O_NONBLOCK |
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#define UFFD_SHARED_FCNTL_FLAGS (O_CLOEXEC | O_NONBLOCK) |
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#define UFFD_FLAGS_SET (EFD_SHARED_FCNTL_FLAGS) |
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extern int handle_userfault(struct vm_fault *vmf, unsigned long reason); |
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extern ssize_t mcopy_atomic(struct mm_struct *dst_mm, unsigned long dst_start, |
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unsigned long src_start, unsigned long len); |
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extern ssize_t mfill_zeropage(struct mm_struct *dst_mm, |
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unsigned long dst_start, |
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unsigned long len); |
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/* mm helpers */ |
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static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, |
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struct vm_userfaultfd_ctx vm_ctx) |
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{ |
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return vma->vm_userfaultfd_ctx.ctx == vm_ctx.ctx; |
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} |
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static inline bool userfaultfd_missing(struct vm_area_struct *vma) |
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{ |
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return vma->vm_flags & VM_UFFD_MISSING; |
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} |
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static inline bool userfaultfd_armed(struct vm_area_struct *vma) |
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{ |
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return vma->vm_flags & (VM_UFFD_MISSING | VM_UFFD_WP); |
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} |
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extern int dup_userfaultfd(struct vm_area_struct *, struct list_head *); |
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extern void dup_userfaultfd_complete(struct list_head *); |
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extern void mremap_userfaultfd_prep(struct vm_area_struct *, |
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struct vm_userfaultfd_ctx *); |
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extern void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *, |
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unsigned long from, unsigned long to, |
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unsigned long len); |
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extern bool userfaultfd_remove(struct vm_area_struct *vma, |
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unsigned long start, |
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unsigned long end); |
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extern int userfaultfd_unmap_prep(struct vm_area_struct *vma, |
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unsigned long start, unsigned long end, |
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struct list_head *uf); |
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extern void userfaultfd_unmap_complete(struct mm_struct *mm, |
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struct list_head *uf); |
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#else /* CONFIG_USERFAULTFD */ |
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/* mm helpers */ |
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static inline int handle_userfault(struct vm_fault *vmf, unsigned long reason) |
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{ |
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return VM_FAULT_SIGBUS; |
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} |
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static inline bool is_mergeable_vm_userfaultfd_ctx(struct vm_area_struct *vma, |
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struct vm_userfaultfd_ctx vm_ctx) |
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{ |
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return true; |
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} |
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static inline bool userfaultfd_missing(struct vm_area_struct *vma) |
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{ |
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return false; |
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} |
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static inline bool userfaultfd_armed(struct vm_area_struct *vma) |
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{ |
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return false; |
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} |
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static inline int dup_userfaultfd(struct vm_area_struct *vma, |
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struct list_head *l) |
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{ |
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return 0; |
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} |
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static inline void dup_userfaultfd_complete(struct list_head *l) |
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{ |
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} |
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static inline void mremap_userfaultfd_prep(struct vm_area_struct *vma, |
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struct vm_userfaultfd_ctx *ctx) |
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{ |
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} |
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static inline void mremap_userfaultfd_complete(struct vm_userfaultfd_ctx *ctx, |
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unsigned long from, |
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unsigned long to, |
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unsigned long len) |
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{ |
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} |
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static inline bool userfaultfd_remove(struct vm_area_struct *vma, |
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unsigned long start, |
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unsigned long end) |
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{ |
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return true; |
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} |
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static inline int userfaultfd_unmap_prep(struct vm_area_struct *vma, |
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unsigned long start, unsigned long end, |
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struct list_head *uf) |
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{ |
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return 0; |
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} |
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static inline void userfaultfd_unmap_complete(struct mm_struct *mm, |
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struct list_head *uf) |
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{ |
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} |
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#endif /* CONFIG_USERFAULTFD */ |
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#endif /* _LINUX_USERFAULTFD_K_H */
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