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[73.219.103.14]) by smtp.gmail.com with ESMTPSA id g4sm1442019qtp.43.2021.10.14.07.30.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 14 Oct 2021 07:30:26 -0700 (PDT) Date: Thu, 14 Oct 2021 10:30:24 -0400 From: Kent Overstreet To: "heming.zhao@suse.com" Cc: Guoqing Jiang , linux-kernel@vger.kernel.org, linux-mm@kvack.org, akpm@linux-foundation.org, linux-raid@vger.kernel.org, linux-block@vger.kernel.org, axboe@kernel.dk, alexander.h.duyck@linux.intel.com Subject: [PATCH v2] md: Kill usage of page->index Message-ID: References: <20211013160034.3472923-1-kent.overstreet@gmail.com> <20211013160034.3472923-5-kent.overstreet@gmail.com> <04714b0e-297b-7383-ed4f-e39ae5e56433@suse.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <04714b0e-297b-7383-ed4f-e39ae5e56433@suse.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Oct 14, 2021 at 04:58:46PM +0800, heming.zhao@suse.com wrote: > Hello all, > > The page->index takes an important role for cluster-md module. > i.e, a two-node HA env, node A bitmap may be managed in first 4K area, then > node B bitmap is in 8K area (the second page). this patch removes the index > and fix/hardcode index with value 0, which will only operate first node bitmap. > > If this serial patches are important and must be merged in mainline, we should > redesign code logic for the related code. > > Thanks, > Heming Can you look at and test the updated patch below? The more I look at the md bitmap code the more it scares me. -- >8 -- Subject: [PATCH] md: Kill usage of page->index As part of the struct page cleanups underway, we want to remove as much usage of page->mapping and page->index as possible, as frequently they are known from context - as they are here in the md bitmap code. Signed-off-by: Kent Overstreet --- drivers/md/md-bitmap.c | 49 ++++++++++++++++++++---------------------- drivers/md/md-bitmap.h | 1 + 2 files changed, 24 insertions(+), 26 deletions(-) diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c index e29c6298ef..316e4cd5a7 100644 --- a/drivers/md/md-bitmap.c +++ b/drivers/md/md-bitmap.c @@ -165,10 +165,8 @@ static int read_sb_page(struct mddev *mddev, loff_t offset, if (sync_page_io(rdev, target, roundup(size, bdev_logical_block_size(rdev->bdev)), - page, REQ_OP_READ, 0, true)) { - page->index = index; + page, REQ_OP_READ, 0, true)) return 0; - } } return -EIO; } @@ -209,7 +207,8 @@ static struct md_rdev *next_active_rdev(struct md_rdev *rdev, struct mddev *mdde return NULL; } -static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) +static int write_sb_page(struct bitmap *bitmap, struct page *page, + unsigned long index, int wait) { struct md_rdev *rdev; struct block_device *bdev; @@ -224,7 +223,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) bdev = (rdev->meta_bdev) ? rdev->meta_bdev : rdev->bdev; - if (page->index == store->file_pages-1) { + if (index == store->file_pages-1) { int last_page_size = store->bytes & (PAGE_SIZE-1); if (last_page_size == 0) last_page_size = PAGE_SIZE; @@ -236,8 +235,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) */ if (mddev->external) { /* Bitmap could be anywhere. */ - if (rdev->sb_start + offset + (page->index - * (PAGE_SIZE/512)) + if (rdev->sb_start + offset + index * PAGE_SECTORS > rdev->data_offset && rdev->sb_start + offset @@ -247,7 +245,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) } else if (offset < 0) { /* DATA BITMAP METADATA */ if (offset - + (long)(page->index * (PAGE_SIZE/512)) + + (long)(index * PAGE_SECTORS) + size/512 > 0) /* bitmap runs in to metadata */ goto bad_alignment; @@ -259,7 +257,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) /* METADATA BITMAP DATA */ if (rdev->sb_start + offset - + page->index*(PAGE_SIZE/512) + size/512 + + index * PAGE_SECTORS + size/512 > rdev->data_offset) /* bitmap runs in to data */ goto bad_alignment; @@ -268,7 +266,7 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait) } md_super_write(mddev, rdev, rdev->sb_start + offset - + page->index * (PAGE_SIZE/512), + + index * PAGE_SECTORS, size, page); } @@ -285,12 +283,13 @@ static void md_bitmap_file_kick(struct bitmap *bitmap); /* * write out a page to a file */ -static void write_page(struct bitmap *bitmap, struct page *page, int wait) +static void write_page(struct bitmap *bitmap, struct page *page, + unsigned long index, int wait) { struct buffer_head *bh; if (bitmap->storage.file == NULL) { - switch (write_sb_page(bitmap, page, wait)) { + switch (write_sb_page(bitmap, page, index, wait)) { case -EINVAL: set_bit(BITMAP_WRITE_ERROR, &bitmap->flags); } @@ -399,7 +398,6 @@ static int read_page(struct file *file, unsigned long index, blk_cur++; bh = bh->b_this_page; } - page->index = index; wait_event(bitmap->write_wait, atomic_read(&bitmap->pending_writes)==0); @@ -472,7 +470,7 @@ void md_bitmap_update_sb(struct bitmap *bitmap) sb->sectors_reserved = cpu_to_le32(bitmap->mddev-> bitmap_info.space); kunmap_atomic(sb); - write_page(bitmap, bitmap->storage.sb_page, 1); + write_page(bitmap, bitmap->storage.sb_page, bitmap->storage.sb_index, 1); } EXPORT_SYMBOL(md_bitmap_update_sb); @@ -524,7 +522,6 @@ static int md_bitmap_new_disk_sb(struct bitmap *bitmap) bitmap->storage.sb_page = alloc_page(GFP_KERNEL | __GFP_ZERO); if (bitmap->storage.sb_page == NULL) return -ENOMEM; - bitmap->storage.sb_page->index = 0; sb = kmap_atomic(bitmap->storage.sb_page); @@ -776,7 +773,7 @@ static int md_bitmap_storage_alloc(struct bitmap_storage *store, unsigned long chunks, int with_super, int slot_number) { - int pnum, offset = 0; + int pnum; unsigned long num_pages; unsigned long bytes; @@ -785,7 +782,7 @@ static int md_bitmap_storage_alloc(struct bitmap_storage *store, bytes += sizeof(bitmap_super_t); num_pages = DIV_ROUND_UP(bytes, PAGE_SIZE); - offset = slot_number * num_pages; + store->sb_index = slot_number * num_pages; store->filemap = kmalloc_array(num_pages, sizeof(struct page *), GFP_KERNEL); @@ -802,7 +799,6 @@ static int md_bitmap_storage_alloc(struct bitmap_storage *store, if (store->sb_page) { store->filemap[0] = store->sb_page; pnum = 1; - store->sb_page->index = offset; } for ( ; pnum < num_pages; pnum++) { @@ -811,7 +807,6 @@ static int md_bitmap_storage_alloc(struct bitmap_storage *store, store->file_pages = pnum; return -ENOMEM; } - store->filemap[pnum]->index = pnum + offset; } store->file_pages = pnum; @@ -929,6 +924,7 @@ static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) unsigned long chunk = block >> bitmap->counts.chunkshift; struct bitmap_storage *store = &bitmap->storage; unsigned long node_offset = 0; + unsigned long index = file_page_index(store, chunk); if (mddev_is_clustered(bitmap->mddev)) node_offset = bitmap->cluster_slot * store->file_pages; @@ -945,9 +941,9 @@ static void md_bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) else set_bit_le(bit, kaddr); kunmap_atomic(kaddr); - pr_debug("set file bit %lu page %lu\n", bit, page->index); + pr_debug("set file bit %lu page %lu\n", bit, index); /* record page number so it gets flushed to disk when unplug occurs */ - set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_DIRTY); + set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_DIRTY); } static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) @@ -958,6 +954,7 @@ static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) unsigned long chunk = block >> bitmap->counts.chunkshift; struct bitmap_storage *store = &bitmap->storage; unsigned long node_offset = 0; + unsigned long index = file_page_index(store, chunk); if (mddev_is_clustered(bitmap->mddev)) node_offset = bitmap->cluster_slot * store->file_pages; @@ -972,8 +969,8 @@ static void md_bitmap_file_clear_bit(struct bitmap *bitmap, sector_t block) else clear_bit_le(bit, paddr); kunmap_atomic(paddr); - if (!test_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_NEEDWRITE)) { - set_page_attr(bitmap, page->index - node_offset, BITMAP_PAGE_PENDING); + if (!test_page_attr(bitmap, index - node_offset, BITMAP_PAGE_NEEDWRITE)) { + set_page_attr(bitmap, index - node_offset, BITMAP_PAGE_PENDING); bitmap->allclean = 0; } } @@ -1027,7 +1024,7 @@ void md_bitmap_unplug(struct bitmap *bitmap) "md bitmap_unplug"); } clear_page_attr(bitmap, i, BITMAP_PAGE_PENDING); - write_page(bitmap, bitmap->storage.filemap[i], 0); + write_page(bitmap, bitmap->storage.filemap[i], i, 0); writing = 1; } } @@ -1137,7 +1134,7 @@ static int md_bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) memset(paddr + offset, 0xff, PAGE_SIZE - offset); kunmap_atomic(paddr); - write_page(bitmap, page, 1); + write_page(bitmap, page, index, 1); ret = -EIO; if (test_bit(BITMAP_WRITE_ERROR, @@ -1336,7 +1333,7 @@ void md_bitmap_daemon_work(struct mddev *mddev) if (bitmap->storage.filemap && test_and_clear_page_attr(bitmap, j, BITMAP_PAGE_NEEDWRITE)) { - write_page(bitmap, bitmap->storage.filemap[j], 0); + write_page(bitmap, bitmap->storage.filemap[j], j, 0); } } diff --git a/drivers/md/md-bitmap.h b/drivers/md/md-bitmap.h index cfd7395de8..6e820eea32 100644 --- a/drivers/md/md-bitmap.h +++ b/drivers/md/md-bitmap.h @@ -207,6 +207,7 @@ struct bitmap { * w/ filemap pages */ unsigned long file_pages; /* number of pages in the file*/ unsigned long bytes; /* total bytes in the bitmap */ + unsigned long sb_index; /* sb page index */ } storage; unsigned long flags; -- 2.33.0