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| author | Andreas Gruenbacher <agruenba@redhat.com> | 2022-04-15 01:28:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-05-01 18:22:29 +0300 |
| commit | 1d91c912e7d14e147183757f48e709f8154f9de3 (patch) | |
| tree | 6bb7b6709dec6561636c0b91662eac2e9186a341 /include/linux/pagemap.h | |
| parent | 30e66b1dfcbbe409c76500a77ecd20b3cf5b8fa5 (diff) | |
| download | linux-1d91c912e7d14e147183757f48e709f8154f9de3.tar.xz | |
iov_iter: Introduce fault_in_iov_iter_writeable
commit cdd591fc86e38ad3899196066219fbbd845f3162 upstream
Introduce a new fault_in_iov_iter_writeable helper for safely faulting
in an iterator for writing. Uses get_user_pages() to fault in the pages
without actually writing to them, which would be destructive.
We'll use fault_in_iov_iter_writeable in gfs2 once we've determined that
the iterator passed to .read_iter isn't in memory.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/pagemap.h')
| -rw-r--r-- | include/linux/pagemap.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 9fe94f7a4f7e..2f7dd14083d9 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -736,6 +736,7 @@ extern void add_page_wait_queue(struct page *page, wait_queue_entry_t *waiter); * Fault in userspace address range. */ size_t fault_in_writeable(char __user *uaddr, size_t size); +size_t fault_in_safe_writeable(const char __user *uaddr, size_t size); size_t fault_in_readable(const char __user *uaddr, size_t size); int add_to_page_cache_locked(struct page *page, struct address_space *mapping, |