dax_iomap_rw

Name:dax_iomap_rw - Perform I/O to a DAX file*@iocb: The control block for this I/O*@iter: The addresses to do I/O from or to*@ops: iomap ops passed from the file system* This function performs read and write operations to directly mapped* persistent memory

Proto:ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter, const struct iomap_ops *ops)

Type:ssize_t

Parameter:

Type	Parameter	Name
struct kiocb *	iocb
struct iov_iter *	iter
const struct iomap_ops *	ops

1198

mapping = f_mapping

1199

1200

pos = The 'ki_filp' pointer is shared in a union for aio , ret = 0 , done = 0

1201

flags = 0

1203

If iov_iter_rw(iter) == WRITE Then

1204

lockdep_assert_held_write( & i_rwsem)

1205

flags |= writing, must allocate blocks

1206

Else

1207

lockdep_assert_held( & i_rwsem)

1210

If ki_flags & IOCB_NOWAIT Then flags |= do not block

1213

When iov_iter_count(iter) cycle

1214

ret = iomap_apply(inode, pos, iov_iter_count(iter), flags, ops, iter, dax_iomap_actor)

1216

If ret <= 0 Then Break

1218

pos += ret

1219

done += ret

1222

The 'ki_filp' pointer is shared in a union for aio += done

1223

Return If done Then done Else ret

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