Inspired by Peter Staubach's patch and the resulting comments.An updated version of the original patch was submitted to LKML
yesterday... :-)
Strange coincidence :)
file = vma->vm_file;It seems to me that this might lead to file times being updated for
start = vma->vm_end;
+ mapping_update_time(file);
if ((flags & MS_SYNC) && file &&
(vma->vm_flags & VM_SHARED)) {
get_file(file);
non-MAP_SHARED mappings.
In theory no, because the COW-ed pages become anonymous and are not
part of the original mapping any more.
+int set_page_dirty_mapping(struct page *page);This aspect of the design seems intrusive to me. I didn't see a strong
reason to introduce new versions of many of the routines just to handle
these semantics. What motivated this part of your design? Why the new
_mapping versions of routines?
Because there's no way to know inside the set_page_dirty() functions
if the dirtying comes from a memory mapping or from a modification
through a normal write(). And they have different semantics, for
write() the modification times are updated immediately.