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Daniel Gomez To: "minchan@kernel.org" , "senozhatsky@chromium.org" , "axboe@kernel.dk" , "djwong@kernel.org" , "willy@infradead.org" , "hughd@google.com" , "akpm@linux-foundation.org" , "mcgrof@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-block@vger.kernel.org" , "linux-xfs@vger.kernel.org" , "linux-fsdevel@vger.kernel.org" , "linux-mm@kvack.org" CC: "gost.dev@samsung.com" , Pankaj Raghav , Daniel Gomez Subject: [RFC PATCH 11/11] shmem: add per-block uptodate tracking Thread-Topic: [RFC PATCH 11/11] shmem: add per-block uptodate tracking Thread-Index: AQHaCePuWb31sxRneEm07VKavHLDZg== Date: Sat, 28 Oct 2023 21:15:52 +0000 Message-ID: <20231028211518.3424020-12-da.gomez@samsung.com> In-Reply-To: <20231028211518.3424020-1-da.gomez@samsung.com> Accept-Language: en-US, en-GB Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-messagesentrepresentingtype: 1 x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [106.110.32.103] MIME-Version: 1.0 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tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Sat, 28 Oct 2023 14:17:15 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781035584838959019 X-GMAIL-MSGID: 1781035584838959019 Current work in progress due to fsx regression (check below). Based on iomap per-block dirty and uptodate state track, add support for shmem_folio_state struct to track uptodate per-block when a folio is larger than a block. In shmem, this is when large folios is used, as one block is equal to one page in this context. Add support for invalidate_folio, release_folio and is_partially_uptodate address space operations. The first two are needed to be able to free the new shmem_folio_state struct. The last callback is required for large folios when enabling per-block tracking. This was spotted when running fstests for tmpfs and regress on generic/285 and generic/436 tests [1] with large folios support in the fallocate path without having per-block uptodate tracking. [1] tests: generic/285: src/seek_sanity_test/test09() generic/436: src/seek_sanity_test/test13() How to reproduce: ```sh mkdir -p /mnt/test-tmpfs ./src/seek_sanity_test -s 9 -e 9 /mnt/test-tmpfs/file ./src/seek_sanity_test -s 13 -e 13 /mnt/test-tmpfs/file umount /mnt/test-tmpfs ``` After per-block uptodate support is added, fsx regresion is found when running the following: ```sh mkdir -p /mnt/test-tmpfs mount -t tmpfs -o size=1G -o noswap tmpfs /mnt/test-tmpfs /root/xfstests-dev/ltp/fsx /mnt/test-tmpfs/file -d -N 1200 -X umount /mnt/test-tmpfs ``` Signed-off-by: Daniel Gomez --- mm/shmem.c | 169 +++++++++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 159 insertions(+), 10 deletions(-) -- 2.39.2 diff --git a/mm/shmem.c b/mm/shmem.c index eb314927be78..fa67594495d5 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -132,6 +132,94 @@ struct shmem_options { #define SHMEM_SEEN_QUOTA 32 }; +/* + * Structure allocated for each folio to track per-block uptodate state. + * + * Like buffered-io shmem_folio_state struct but only for uptodate. + */ +struct shmem_folio_state { + spinlock_t state_lock; + unsigned long state[]; +}; + +static inline bool sfs_is_fully_uptodate(struct folio *folio, + struct shmem_folio_state *sfs) +{ + struct inode *inode = folio->mapping->host; + + return bitmap_full(sfs->state, i_blocks_per_folio(inode, folio)); +} + +static inline bool sfs_block_is_uptodate(struct shmem_folio_state *sfs, + unsigned int block) +{ + return test_bit(block, sfs->state); +} + +static void sfs_set_range_uptodate(struct folio *folio, + struct shmem_folio_state *sfs, size_t off, + size_t len) +{ + struct inode *inode = folio->mapping->host; + unsigned int first_blk = off >> inode->i_blkbits; + unsigned int last_blk = (off + len - 1) >> inode->i_blkbits; + unsigned int nr_blks = last_blk - first_blk + 1; + unsigned long flags; + + spin_lock_irqsave(&sfs->state_lock, flags); + bitmap_set(sfs->state, first_blk, nr_blks); + if (sfs_is_fully_uptodate(folio, sfs)) + folio_mark_uptodate(folio); + spin_unlock_irqrestore(&sfs->state_lock, flags); +} + +static void shmem_set_range_uptodate(struct folio *folio, size_t off, + size_t len) +{ + struct shmem_folio_state *sfs = folio->private; + + if (sfs) + sfs_set_range_uptodate(folio, sfs, off, len); + else + folio_mark_uptodate(folio); +} + +static struct shmem_folio_state *sfs_alloc(struct inode *inode, + struct folio *folio, gfp_t gfp) +{ + struct shmem_folio_state *sfs = folio->private; + unsigned int nr_blocks = i_blocks_per_folio(inode, folio); + + if (sfs || nr_blocks <= 1) + return sfs; + + /* + * sfs->state tracks uptodate flag when the block size is smaller + * than the folio size. + */ + sfs = kzalloc(struct_size(sfs, state, BITS_TO_LONGS(nr_blocks)), gfp); + if (!sfs) + return sfs; + + spin_lock_init(&sfs->state_lock); + if (folio_test_uptodate(folio)) + bitmap_set(sfs->state, 0, nr_blocks); + folio_attach_private(folio, sfs); + + return sfs; +} + +static void sfs_free(struct folio *folio) +{ + struct shmem_folio_state *sfs = folio_detach_private(folio); + + if (!sfs) + return; + WARN_ON_ONCE(sfs_is_fully_uptodate(folio, sfs) != + folio_test_uptodate(folio)); + kfree(sfs); +} + #ifdef CONFIG_TMPFS static unsigned long shmem_default_max_blocks(void) { @@ -1495,7 +1583,7 @@ static int shmem_writepage(struct page *page, struct writeback_control *wbc) } folio_zero_range(folio, 0, folio_size(folio)); flush_dcache_folio(folio); - folio_mark_uptodate(folio); + shmem_set_range_uptodate(folio, 0, folio_size(folio)); } swap = folio_alloc_swap(folio); @@ -1676,6 +1764,7 @@ static struct folio *shmem_alloc_and_add_folio(gfp_t gfp, struct shmem_inode_info *info = SHMEM_I(inode); unsigned int order = shmem_mapping_size_order(mapping, index, len, SHMEM_SB(inode->i_sb)); + struct shmem_folio_state *sfs; struct folio *folio; long pages; int error; @@ -1755,6 +1844,10 @@ static struct folio *shmem_alloc_and_add_folio(gfp_t gfp, } } + sfs = sfs_alloc(inode, folio, gfp); + if (!sfs && i_blocks_per_folio(inode, folio) > 1) + goto unlock; + trace_mm_shmem_add_to_page_cache(folio); shmem_recalc_inode(inode, pages, 0); folio_add_lru(folio); @@ -1818,7 +1911,7 @@ static int shmem_replace_folio(struct folio **foliop, gfp_t gfp, __folio_set_locked(new); __folio_set_swapbacked(new); - folio_mark_uptodate(new); + shmem_set_range_uptodate(new, 0, folio_size(new)); new->swap = entry; folio_set_swapcache(new); @@ -2146,7 +2239,7 @@ static int shmem_get_folio_gfp(struct inode *inode, pgoff_t index, for (i = 0; i < n; i++) clear_highpage(folio_page(folio, i)); flush_dcache_folio(folio); - folio_mark_uptodate(folio); + shmem_set_range_uptodate(folio, 0, folio_size(folio)); } /* Perhaps the file has been truncated since we checked */ @@ -2788,13 +2881,18 @@ shmem_write_end(struct file *file, struct address_space *mapping, if (pos + copied > inode->i_size) i_size_write(inode, pos + copied); + if (unlikely(copied < len && !folio_test_uptodate(folio))) + return 0; + if (!folio_test_uptodate(folio)) { - if (copied < folio_size(folio)) { - size_t from = offset_in_folio(folio, pos); - folio_zero_segments(folio, 0, from, - from + copied, folio_size(folio)); - } - folio_mark_uptodate(folio); + size_t from = offset_in_folio(folio, pos); + if (!folio_test_large(folio) && copied < folio_size(folio)) + folio_zero_segments(folio, 0, from, from + copied, + folio_size(folio)); + if (folio_test_large(folio) && copied < PAGE_SIZE) + folio_zero_segments(folio, from, from, from + copied, + folio_size(folio)); + shmem_set_range_uptodate(folio, from, len); } folio_mark_dirty(folio); folio_unlock(folio); @@ -2803,6 +2901,54 @@ shmem_write_end(struct file *file, struct address_space *mapping, return copied; } +void shmem_invalidate_folio(struct folio *folio, size_t offset, size_t len) +{ + /* + * If we're invalidating the entire folio, clear the dirty state + * from it and release it to avoid unnecessary buildup of the LRU. + */ + if (offset == 0 && len == folio_size(folio)) { + WARN_ON_ONCE(folio_test_writeback(folio)); + folio_cancel_dirty(folio); + sfs_free(folio); + } +} + +bool shmem_release_folio(struct folio *folio, gfp_t gfp_flags) +{ + sfs_free(folio); + return true; +} + +/* + * shmem_is_partially_uptodate checks whether blocks within a folio are + * uptodate or not. + * + * Returns true if all blocks which correspond to the specified part + * of the folio are uptodate. + */ +bool shmem_is_partially_uptodate(struct folio *folio, size_t from, size_t count) +{ + struct shmem_folio_state *sfs = folio->private; + struct inode *inode = folio->mapping->host; + unsigned first, last, i; + + if (!sfs) + return false; + + /* Caller's range may extend past the end of this folio */ + count = min(folio_size(folio) - from, count); + + /* First and last blocks in range within folio */ + first = from >> inode->i_blkbits; + last = (from + count - 1) >> inode->i_blkbits; + + for (i = first; i <= last; i++) + if (!sfs_block_is_uptodate(sfs, i)) + return false; + return true; +} + static ssize_t shmem_file_read_iter(struct kiocb *iocb, struct iov_iter *to) { struct file *file = iocb->ki_filp; @@ -3554,7 +3700,7 @@ static int shmem_symlink(struct mnt_idmap *idmap, struct inode *dir, inode->i_mapping->a_ops = &shmem_aops; inode->i_op = &shmem_symlink_inode_operations; memcpy(folio_address(folio), symname, len); - folio_mark_uptodate(folio); + shmem_set_range_uptodate(folio, 0, folio_size(folio)); folio_mark_dirty(folio); folio_unlock(folio); folio_put(folio); @@ -4524,6 +4670,9 @@ const struct address_space_operations shmem_aops = { #ifdef CONFIG_MIGRATION .migrate_folio = migrate_folio, #endif + .invalidate_folio = shmem_invalidate_folio, + .release_folio = shmem_release_folio, + .is_partially_uptodate = shmem_is_partially_uptodate, .error_remove_page = shmem_error_remove_page, }; EXPORT_SYMBOL(shmem_aops);