> in this vm_operations_struct , there are open/close functions , are there necessary relations between file operations and this struct ?
well not really for open/close of vm_ops are of interest to filesystems, but page fault handler and making page writable is where filesystem come into picture. Have a look at ext4_file_vm_ops, it implements operations of interest.
static const struct vm_operations_struct ext4_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = ext4_page_mkwrite,
}
Note that only filesystem knows how to fill up this page.well not really for open/close of vm_ops are of interest to filesystems, but page fault handler and making page writable is where filesystem come into picture. Have a look at ext4_file_vm_ops, it implements operations of interest.
static const struct vm_operations_struct ext4_file_vm_ops = {
.fault = filemap_fault,
.page_mkwrite = ext4_page_mkwrite,
}
On Thu, Jan 3, 2013 at 3:39 PM, horseriver <horserivers@xxxxxxxxx> wrote:
On Thu, Jan 03, 2013 at 01:16:06PM +0530, Rajat Sharma wrote:you know that , in the struct vm_area_struct,there is a struct vm_operations_struct * vm_ops;
> > will it be maped with vm_area struct ?
> Yes if it is accessed via mmap system call.
in this vm_operations_struct , there are open/close functions , are there necessary relations between file
operations and this struct ?
thanks!
>
> > what is the relation between page-cache and file operation?
> file operations for data access like read/write will look into page-cache
> first before going to disk.
>
> -Rajat
>
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