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author | Al Viro <viro@zeniv.linux.org.uk> | 2017-02-17 18:42:24 -0500 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-04-02 12:10:47 -0400 |
commit | 27c0e3748e41ca79171ffa3e97415a20af6facd0 (patch) | |
tree | 9a9486ef6d962e7a5d7b97d5e60cd490554d1980 /include/linux/uio.h | |
parent | c02ed2e75ef4c74e41e421acb4ef1494671585e8 (diff) | |
download | linux-stable-27c0e3748e41ca79171ffa3e97415a20af6facd0.tar.gz linux-stable-27c0e3748e41ca79171ffa3e97415a20af6facd0.tar.bz2 linux-stable-27c0e3748e41ca79171ffa3e97415a20af6facd0.zip |
[iov_iter] new privimitive: iov_iter_revert()
opposite to iov_iter_advance(); the caller is responsible for never
using it to move back past the initial position.
Cc: stable@vger.kernel.org
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'include/linux/uio.h')
-rw-r--r-- | include/linux/uio.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/uio.h b/include/linux/uio.h index 804e34c6f981..f2d36a3d3005 100644 --- a/include/linux/uio.h +++ b/include/linux/uio.h @@ -39,7 +39,10 @@ struct iov_iter { }; union { unsigned long nr_segs; - int idx; + struct { + int idx; + int start_idx; + }; }; }; @@ -81,6 +84,7 @@ unsigned long iov_shorten(struct iovec *iov, unsigned long nr_segs, size_t to); size_t iov_iter_copy_from_user_atomic(struct page *page, struct iov_iter *i, unsigned long offset, size_t bytes); void iov_iter_advance(struct iov_iter *i, size_t bytes); +void iov_iter_revert(struct iov_iter *i, size_t bytes); int iov_iter_fault_in_readable(struct iov_iter *i, size_t bytes); size_t iov_iter_single_seg_count(const struct iov_iter *i); size_t copy_page_to_iter(struct page *page, size_t offset, size_t bytes, |