Nfs client begin to write data
nfs.aop.write_begin
__page
the address of page
to
end address of this write operation
page_index
offset within mapping, can used a page identifier and position identifier in the page frame
dev
device identifier
size
write bytes
ino
inode number
offset
start address of this write operation
Occurs when write operation occurs on nfs. It prepare a page for writing, look for a request corresponding to the page. If there is one, and it belongs to another file, it flush it out before it tries to copy anything into the page. Also do the same if it finds a request from an existing dropped page