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fuse: Replace page without copying in fuse_writepage_in_flight() 

It looks like we can optimize page replacement and avoid copying by simple
updating the request's page.

[SzM: swap with new request's tmp page to avoid use after free.]

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Kirill Tkhai 2018-11-26 12:46:20 +03:00 committed by Miklos Szeredi
parent e2653bd53a
commit c5de16cca2
1 changed files with 1 additions and 1 deletions
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2
fs/fuse/file.c
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@ -1789,7 +1789,7 @@ static bool fuse_writepage_in_flight(struct fuse_req *new_req,
if (curr_index == page->index) {
WARN_ON(tmp->num_pages != 1);
WARN_ON(!test_bit(FR_PENDING, &tmp->flags));
copy_highpage(tmp->pages[0], page);
swap(tmp->pages[0], new_req->pages[0]);
break;
}
}