Messages in this thread Patch in this message | | | From | jglisse@redhat ... | Subject | [RFC PATCH 05/79] mm/swap: add an helper to get address_space from swap_entry_t | Date | Wed, 4 Apr 2018 15:17:52 -0400 |
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From: Jérôme Glisse <jglisse@redhat.com>
Each swap entry is associated to a file and thus an address_space. That address_space is use for reading/writing to swap storage. This patch add an helper to get the address_space from swap_entry_t.
Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Cc: Michal Hocko <mhocko@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Andrew Morton <akpm@linux-foundation.org> --- include/linux/swap.h | 1 + mm/swapfile.c | 7 +++++++ 2 files changed, 8 insertions(+)
diff --git a/include/linux/swap.h b/include/linux/swap.h index a1a3f4ed94ce..e2155df84d77 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -475,6 +475,7 @@ extern int __swp_swapcount(swp_entry_t entry); extern int swp_swapcount(swp_entry_t entry); extern struct swap_info_struct *page_swap_info(struct page *); extern struct swap_info_struct *swp_swap_info(swp_entry_t entry); +struct address_space *swap_entry_to_address_space(swp_entry_t swap); extern bool reuse_swap_page(struct page *, int *); extern int try_to_free_swap(struct page *); struct backing_dev_info; diff --git a/mm/swapfile.c b/mm/swapfile.c index c7a33717d079..a913d4b45866 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3467,6 +3467,13 @@ struct swap_info_struct *swp_swap_info(swp_entry_t entry) return swap_info[swp_type(entry)]; } +struct address_space *swap_entry_to_address_space(swp_entry_t swap) +{ + struct swap_info_struct *sis = swp_swap_info(swap); + + return sis->swap_file->f_mapping; +} + struct swap_info_struct *page_swap_info(struct page *page) { swp_entry_t entry = { .val = page_private(page) }; -- 2.14.3
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