proc: introduce proc_mem_open()
Extract the mm_access() code from __mem_open() into the new helper, proc_mem_open(), the next patch will add another caller. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -632,29 +632,35 @@ static const struct file_operations proc_single_file_operations = {
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.release = single_release,
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};
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struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode)
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{
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struct task_struct *task = get_proc_task(inode);
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struct mm_struct *mm = ERR_PTR(-ESRCH);
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if (task) {
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mm = mm_access(task, mode);
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put_task_struct(task);
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if (!IS_ERR_OR_NULL(mm)) {
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/* ensure this mm_struct can't be freed */
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atomic_inc(&mm->mm_count);
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/* but do not pin its memory */
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mmput(mm);
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}
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}
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return mm;
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}
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static int __mem_open(struct inode *inode, struct file *file, unsigned int mode)
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{
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struct task_struct *task = get_proc_task(file_inode(file));
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struct mm_struct *mm;
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if (!task)
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return -ESRCH;
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mm = mm_access(task, mode);
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put_task_struct(task);
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struct mm_struct *mm = proc_mem_open(inode, mode);
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if (IS_ERR(mm))
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return PTR_ERR(mm);
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if (mm) {
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/* ensure this mm_struct can't be freed */
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atomic_inc(&mm->mm_count);
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/* but do not pin its memory */
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mmput(mm);
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}
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file->private_data = mm;
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return 0;
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}
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@ -278,6 +278,8 @@ struct proc_maps_private {
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#endif
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};
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struct mm_struct *proc_mem_open(struct inode *inode, unsigned int mode);
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extern const struct file_operations proc_pid_maps_operations;
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extern const struct file_operations proc_tid_maps_operations;
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extern const struct file_operations proc_pid_numa_maps_operations;
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