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AJvYcCWd8lSetGTNPNfx8XneCO5RdpxjiJAUaEXEHmeyVEzYSIlc+MTeiCW2l8E+4nAGlFkIBWFXXTtQafHSqsLyb+ZNWAxK5NC5hM8YiOX50UBY9gZiL75YryuxT7qunVNA6AIlLWeKS5ZDsRLJew== X-Gm-Message-State: AOJu0YzC89kJTdxT3lxDu56YryYF4RfzGnMbhQ7B15URyhQlEu4w2LDX bf2F47AGyZqvRo0D6xY7Uj/ms0dEUOE/H1Fx66OttTkHzpww6gh3 X-Google-Smtp-Source: AGHT+IHl29mA2dJ+DAVqdOiUnUGnuaMZJ8DMUB92M2KECrfDvhzldwg40C7x44GzkGKAl0R+XjVRbg== X-Received: by 2002:a17:90a:f40f:b0:2a5:506f:161c with SMTP id ch15-20020a17090af40f00b002a5506f161cmr104445pjb.4.1713891862010; Tue, 23 Apr 2024 10:04:22 -0700 (PDT) Received: from KASONG-MB2.tencent.com ([1.203.116.31]) by smtp.gmail.com with ESMTPSA id s19-20020a17090a881300b002a5d684a6a7sm9641148pjn.10.2024.04.23.10.04.18 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 23 Apr 2024 10:04:21 -0700 (PDT) From: Kairui Song To: linux-mm@kvack.org Cc: Andrew Morton , "Huang, Ying" , Matthew Wilcox , Chris Li , Barry Song , Ryan Roberts , Neil Brown , Minchan Kim , Hugh Dickins , David Hildenbrand , Yosry Ahmed , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, Kairui Song Subject: [PATCH v2 7/8] mm: drop page_index/page_file_offset and convert swap helpers to use folio Date: Wed, 24 Apr 2024 01:03:38 +0800 Message-ID: <20240423170339.54131-8-ryncsn@gmail.com> X-Mailer: git-send-email 2.44.0 In-Reply-To: <20240423170339.54131-1-ryncsn@gmail.com> References: <20240423170339.54131-1-ryncsn@gmail.com> Reply-To: Kairui Song Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Kairui Song There are four helpers for retrieving the page index within address space, or offset within mapped file: - page_index - page_file_offset - folio_index (equivalence of page_index) - folio_file_pos (equivalence of page_file_offset) And they are only needed for mixed usage of swap cache & page cache (eg. migration, huge memory split). Else users can just use folio->index or folio_pos. This commit drops page_index and page_file_offset as we have eliminated all users, and converts folio_index and folio_file_pos (they were simply wrappers of page_index and page_file_offset, and implemented in a not very clean way) to use folio internally. After this commit, there will be only two helpers for users that may encounter mixed usage of swap cache and page cache: - folio_index (calls __folio_swap_cache_index for swap cache folio) - folio_file_pos (calls __folio_swap_dev_pos for swap cache folio) The index in swap cache and offset in swap device are still basically the same thing, but will be different in following commits. Signed-off-by: Kairui Song --- include/linux/mm.h | 13 ------------- include/linux/pagemap.h | 19 +++++++++---------- mm/swapfile.c | 13 +++++++++---- 3 files changed, 18 insertions(+), 27 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 0436b919f1c7..797480e76c9c 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2245,19 +2245,6 @@ static inline void *folio_address(const struct folio *folio) return page_address(&folio->page); } -extern pgoff_t __page_file_index(struct page *page); - -/* - * Return the pagecache index of the passed page. Regular pagecache pages - * use ->index whereas swapcache pages use swp_offset(->private) - */ -static inline pgoff_t page_index(struct page *page) -{ - if (unlikely(PageSwapCache(page))) - return __page_file_index(page); - return page->index; -} - /* * Return true only if the page has been allocated with * ALLOC_NO_WATERMARKS and the low watermark was not diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 2df35e65557d..a7d025571ee6 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -780,7 +780,7 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping, mapping_gfp_mask(mapping)); } -#define swapcache_index(folio) __page_file_index(&(folio)->page) +extern pgoff_t __folio_swap_cache_index(struct folio *folio); /** * folio_index - File index of a folio. @@ -795,9 +795,9 @@ static inline struct page *grab_cache_page_nowait(struct address_space *mapping, */ static inline pgoff_t folio_index(struct folio *folio) { - if (unlikely(folio_test_swapcache(folio))) - return swapcache_index(folio); - return folio->index; + if (unlikely(folio_test_swapcache(folio))) + return __folio_swap_cache_index(folio); + return folio->index; } /** @@ -920,11 +920,6 @@ static inline loff_t page_offset(struct page *page) return ((loff_t)page->index) << PAGE_SHIFT; } -static inline loff_t page_file_offset(struct page *page) -{ - return ((loff_t)page_index(page)) << PAGE_SHIFT; -} - /** * folio_pos - Returns the byte position of this folio in its file. * @folio: The folio. @@ -934,6 +929,8 @@ static inline loff_t folio_pos(struct folio *folio) return page_offset(&folio->page); } +extern loff_t __folio_swap_dev_pos(struct folio *folio); + /** * folio_file_pos - Returns the byte position of this folio in its file. * @folio: The folio. @@ -943,7 +940,9 @@ static inline loff_t folio_pos(struct folio *folio) */ static inline loff_t folio_file_pos(struct folio *folio) { - return page_file_offset(&folio->page); + if (unlikely(folio_test_swapcache(folio))) + return __folio_swap_dev_pos(folio); + return ((loff_t)folio->index << PAGE_SHIFT); } /* diff --git a/mm/swapfile.c b/mm/swapfile.c index 4919423cce76..2387f5e131d7 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -3419,12 +3419,17 @@ struct address_space *swapcache_mapping(struct folio *folio) } EXPORT_SYMBOL_GPL(swapcache_mapping); -pgoff_t __page_file_index(struct page *page) +pgoff_t __folio_swap_cache_index(struct folio *folio) { - swp_entry_t swap = page_swap_entry(page); - return swp_offset(swap); + return swp_offset(folio->swap); } -EXPORT_SYMBOL_GPL(__page_file_index); +EXPORT_SYMBOL_GPL(__folio_swap_cache_index); + +loff_t __folio_swap_dev_pos(struct folio *folio) +{ + return swap_dev_pos(folio->swap); +} +EXPORT_SYMBOL_GPL(__folio_swap_dev_pos); /* * add_swap_count_continuation - called when a swap count is duplicated -- 2.44.0