mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
new primitive: iov_iter_for_each_range()
For kvec and bvec: feeds segments to given callback as long as it returns 0. For iovec and pipe: fails. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
parent
6d1ff4d6f3
commit
09cf698a59
|
@ -244,4 +244,8 @@ int compat_import_iovec(int type, const struct compat_iovec __user * uvector,
|
|||
int import_single_range(int type, void __user *buf, size_t len,
|
||||
struct iovec *iov, struct iov_iter *i);
|
||||
|
||||
int iov_iter_for_each_range(struct iov_iter *i, size_t bytes,
|
||||
int (*f)(struct kvec *vec, void *context),
|
||||
void *context);
|
||||
|
||||
#endif
|
||||
|
|
|
@ -1446,3 +1446,25 @@ int import_single_range(int rw, void __user *buf, size_t len,
|
|||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(import_single_range);
|
||||
|
||||
int iov_iter_for_each_range(struct iov_iter *i, size_t bytes,
|
||||
int (*f)(struct kvec *vec, void *context),
|
||||
void *context)
|
||||
{
|
||||
struct kvec w;
|
||||
int err = -EINVAL;
|
||||
if (!bytes)
|
||||
return 0;
|
||||
|
||||
iterate_all_kinds(i, bytes, v, -EINVAL, ({
|
||||
w.iov_base = kmap(v.bv_page) + v.bv_offset;
|
||||
w.iov_len = v.bv_len;
|
||||
err = f(&w, context);
|
||||
kunmap(v.bv_page);
|
||||
err;}), ({
|
||||
w = v;
|
||||
err = f(&w, context);})
|
||||
)
|
||||
return err;
|
||||
}
|
||||
EXPORT_SYMBOL(iov_iter_for_each_range);
|
||||
|
|
Loading…
Reference in a new issue