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| author | Al Viro <viro@zeniv.linux.org.uk> | 2022-05-22 20:59:25 +0200 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2022-08-09 04:37:15 +0200 |
| commit | fcb14cb1bdacec5b4374fe161e83fb8208164a85 (patch) | |
| tree | 06b308b8f6b67c65e0c1e90d2e97e61ae66f232a /fs/read_write.c | |
| parent | Merge tag 'for-5.20/block-2022-08-04' of git://git.kernel.dk/linux-block (diff) | |
| download | linux-fcb14cb1bdacec5b4374fe161e83fb8208164a85.tar.xz linux-fcb14cb1bdacec5b4374fe161e83fb8208164a85.zip | |
new iov_iter flavour - ITER_UBUF
Equivalent of single-segment iovec. Initialized by iov_iter_ubuf(),
checked for by iter_is_ubuf(), otherwise behaves like ITER_IOVEC
ones.
We are going to expose the things like ->write_iter() et.al. to those
in subsequent commits.
New predicate (user_backed_iter()) that is true for ITER_IOVEC and
ITER_UBUF; places like direct-IO handling should use that for
checking that pages we modify after getting them from iov_iter_get_pages()
would need to be dirtied.
DO NOT assume that replacing iter_is_iovec() with user_backed_iter()
will solve all problems - there's code that uses iter_is_iovec() to
decide how to poke around in iov_iter guts and for that the predicate
replacement obviously won't suffice.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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