do_vmsplice

Name:Note that vmsplice only really supports true splicing _from_ user memory* to a pipe, not the other way around. Splicing from user memory is a simple* operation that can be supported without any funky alignment restrictions* or nasty vm tricks

Proto:static long do_vmsplice(struct file *f, struct iov_iter *iter, unsigned int flags)

Type:long

Parameter:

Type	Parameter	Name
struct file *	f
struct iov_iter *	iter
unsigned int	flags

1363

If Value for the false possibility is greater at compile time(flags & ~SPLICE_F_ALL) Then Return -EINVAL

1366

If Not iov_iter_count(iter) Then Return 0

1369

If iov_iter_rw(iter) == WRITE Then Return vmsplice splices a user address range into a pipe. It can be thought of* as splice-from-memory, where the regular splice is splice-from-file (or* to file). In both cases the output is a pipe, naturally.

1371

Else Return For lack of a better implementation, implement vmsplice() to userspace* as a simple copy of the pipes pages to the user iov.

**Caller**
Name	Describe
SYSCALL_DEFINE4
COMPAT_SYSCALL_DEFINE4

Source code conversion tool public plug-in interface	X
Support c/c++/esqlc/java Oracle/Informix/Mysql Plug-in can realize: logical Report Code generation and batch code conversion

Function report