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author | Al Viro <viro@zeniv.linux.org.uk> | 2021-04-30 10:26:41 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2021-06-10 11:45:14 -0400 |
commit | f0b65f39ac505e8f1dcdaa165aa7b8c0bd6fd454 (patch) | |
tree | 05ad20f84ee097a534132fa9b2df9feae6d4a7d2 /Documentation | |
parent | e4f8df86798aea60aff6cfff40252b709431f850 (diff) | |
download | linux-stable-f0b65f39ac505e8f1dcdaa165aa7b8c0bd6fd454.tar.gz linux-stable-f0b65f39ac505e8f1dcdaa165aa7b8c0bd6fd454.tar.bz2 linux-stable-f0b65f39ac505e8f1dcdaa165aa7b8c0bd6fd454.zip |
iov_iter: replace iov_iter_copy_from_user_atomic() with iterator-advancing variant
Replacement is called copy_page_from_iter_atomic(); unlike the old primitive the
callers do *not* need to do iov_iter_advance() after it. In case when they end
up consuming less than they'd been given they need to do iov_iter_revert() on
everything they had not consumed. That, however, needs to be done only on slow
paths.
All in-tree callers converted. And that kills the last user of iterate_all_kinds()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/filesystems/porting.rst | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting.rst b/Documentation/filesystems/porting.rst index 0302035781be..43b492d08dec 100644 --- a/Documentation/filesystems/porting.rst +++ b/Documentation/filesystems/porting.rst @@ -890,3 +890,12 @@ been called or returned with non -EIOCBQUEUED code. mnt_want_write_file() can now only be paired with mnt_drop_write_file(), whereas previously it could be paired with mnt_drop_write() as well. + +--- + +**mandatory** + +iov_iter_copy_from_user_atomic() is gone; use copy_page_from_iter_atomic(). +The difference is copy_page_from_iter_atomic() advances the iterator and +you don't need iov_iter_advance() after it. However, if you decide to use +only a part of obtained data, you should do iov_iter_revert(). |