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mm: introduce fault_env

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The idea borrowed from Peter's patch from patchset on speculative page
faults[1]:

Instead of passing around the endless list of function arguments,
replace the lot with a single structure so we can change context without
endless function signature changes.

The changes are mostly mechanical with exception of faultaround code:
filemap_map_pages() got reworked a bit.

This patch is preparation for the next one.

[1] http://lkml.kernel.org/r/20141020222841.302891540@infradead.org

Link: http://lkml.kernel.org/r/1466021202-61880-9-git-send-email-kirill.shutemov@linux.intel.com
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Kirill A. Shutemov
2016-07-26 15:25:20 -07:00
committed by Linus Torvalds
parent dcddffd41d
commit bae473a423
10 changed files with 474 additions and 515 deletions
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34
include/linux/mm.h
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@@ -309,10 +309,27 @@ struct vm_fault {
* VM_FAULT_DAX_LOCKED and fill in
* entry here.
*/
/* for ->map_pages() only */
pgoff_t max_pgoff; /* map pages for offset from pgoff till
* max_pgoff inclusive */
pte_t *pte; /* pte entry associated with ->pgoff */
};
/*
* Page fault context: passes though page fault handler instead of endless list
* of function arguments.
*/
struct fault_env {
struct vm_area_struct *vma; /* Target VMA */
unsigned long address; /* Faulting virtual address */
unsigned int flags; /* FAULT_FLAG_xxx flags */
pmd_t *pmd; /* Pointer to pmd entry matching
* the 'address'
*/
pte_t *pte; /* Pointer to pte entry matching
* the 'address'. NULL if the page
* table hasn't been allocated.
*/
spinlock_t *ptl; /* Page table lock.
* Protects pte page table if 'pte'
* is not NULL, otherwise pmd.
*/
};
/*
@@ -327,7 +344,8 @@ struct vm_operations_struct {
int (*fault)(struct vm_area_struct *vma, struct vm_fault *vmf);
int (*pmd_fault)(struct vm_area_struct *, unsigned long address,
pmd_t *, unsigned int flags);
void (*map_pages)(struct vm_area_struct *vma, struct vm_fault *vmf);
void (*map_pages)(struct fault_env *fe,
pgoff_t start_pgoff, pgoff_t end_pgoff);
/* notification that a previously read-only page is about to become
* writable, if an error is returned it will cause a SIGBUS */
@@ -600,8 +618,7 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
return pte;
}
void do_set_pte(struct vm_area_struct *vma, unsigned long address,
struct page *page, pte_t *pte, bool write, bool anon);
void do_set_pte(struct fault_env *fe, struct page *page);
#endif
/*
@@ -2062,7 +2079,8 @@ extern void truncate_inode_pages_final(struct address_space *);
/* generic vm_area_ops exported for stackable file systems */
extern int filemap_fault(struct vm_area_struct *, struct vm_fault *);
extern void filemap_map_pages(struct vm_area_struct *vma, struct vm_fault *vmf);
extern void filemap_map_pages(struct fault_env *fe,
pgoff_t start_pgoff, pgoff_t end_pgoff);
extern int filemap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
/* mm/page-writeback.c */