Nfs client synchronously reading a page
nfs.aop.readpage
i_flag
file flags
rsize
read size (in bytes)
__page
the address of page
sb_flag
super block flags
file
file argument
ino
inode number
size
number of pages to be read in this execution
dev
device identifier
i_size
file length in bytes
page_index
offset within mapping, can used a page identifier and position identifier in the page frame
Read the page over, only fires when a previous async read operation failed