nfs_direct_IO

NAME

SYNOPSIS

int nfs_direct_IO (int rw, struct kiocb * iocb, const struct iovec * iov, loff_t file_offset, unsigned long nr_segs);  

ARGUMENTS

rw

-- undescribed --

iocb

target I/O control block

iov

array of vectors that define I/O buffer

file_offset

-- undescribed --

nr_segs

-- undescribed --

RW

direction (read or write)  

FILE_OFFSET

offset in file to begin the operation  

NR_SEGS

size of iovec array

Usually a file system implements direct I/O by calling out to blockdev_direct_IO. The NFS client doesn't have a backing block device, so we do everything by hand instead.

The inode's i_sem is no longer held by the VFS layer before it calls this function to do a write.

Index

NAME

SYNOPSIS

ARGUMENTS

RW

FILE_OFFSET

NR_SEGS