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mm: gup: use get_user_pages_unlocked

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This allows those get_user_pages calls to pass FAULT_FLAG_ALLOW_RETRY to
the page fault in order to release the mmap_sem during the I/O.

Signed-off-by: Andrea Arcangeli <[email protected]>
Reviewed-by: Kirill A. Shutemov <[email protected]>
Cc: Andres Lagar-Cavilla <[email protected]>
Cc: Peter Feiner <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrea Arcangeli 2015-02-11 15:27:26 -08:00 • committed by Linus Torvalds
commit 7e33912849
5 changed files with 10 additions and 22 deletions
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6
net/ceph/pagevec.c
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@ -23,17 +23,15 @@ struct page **ceph_get_direct_page_vector(const void __user *data,
if (!pages)
return ERR_PTR(-ENOMEM);
down_read(&current->mm->mmap_sem);
while (got < num_pages) {
rc = get_user_pages(current, current->mm,
rc = get_user_pages_unlocked(current, current->mm,
(unsigned long)data + ((unsigned long)got * PAGE_SIZE),
num_pages - got, write_page, 0, pages + got, NULL);
num_pages - got, write_page, 0, pages + got);
if (rc < 0)
break;
BUG_ON(rc == 0);
got += rc;
}
up_read(&current->mm->mmap_sem);
if (rc < 0)
goto fail;
return pages;