linux - What is the private page? -


in page struct, there private field. if use page_buffers() function, return field.

and there privatepage(). dont know is.

what this?

see include/linux/page-flags.h:

 * private page markings may used filesystem owns page  * own purposes.  * - pg_private , pg_private_2 cause releasepage() , co invoked

and documentation/filesystems/vfs.txt:

an address_space handler may attach information page, typically using 'private' field in 'struct page'. if such information attached, pg_private flag should set. cause various vm routines make calls address_space handler deal data.

page_buffers() specific case private field contains pointer struct buffer_head, common pattern in filesystem drivers.


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