Messages in this thread Patch in this message | | | From | Stephen Wilson <> | Subject | [PATCH 3/6] mm: implement access_remote_vm | Date | Tue, 8 Mar 2011 19:42:20 -0500 |
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Provide an alternative to access_process_vm that allows the caller to obtain a reference to the supplied mm_struct.
Signed-off-by: Stephen Wilson <wilsons@start.ca> --- include/linux/mm.h | 2 ++ mm/memory.c | 16 ++++++++++++++++ 2 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h index 694512d..e5fde8a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -964,6 +964,8 @@ static inline int handle_mm_fault(struct mm_struct *mm, extern int make_pages_present(unsigned long addr, unsigned long end); extern int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write); +extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, + void *buf, int len, int write); int get_user_pages(struct task_struct *tsk, struct mm_struct *mm, unsigned long start, int nr_pages, int write, int force, diff --git a/mm/memory.c b/mm/memory.c index 68eec4f..c26e4f9 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3654,6 +3654,22 @@ static int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm, return buf - old_buf; } +/** + * @access_remote_vm - access another process' address space + * @mm: the mm_struct of the target address space + * @addr: start address to access + * @buf: source or destination buffer + * @len: number of bytes to transfer + * @write: whether the access is a write + * + * The caller must hold a reference on @mm. + */ +int access_remote_vm(struct mm_struct *mm, unsigned long addr, + void *buf, int len, int write) +{ + return __access_remote_vm(NULL, mm, addr, buf, len, write); +} + /* * Access another process' address space. * Source/target buffer must be kernel space, -- 1.7.3.5
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