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Date: Mon, 18 Oct 2021 06:40:48 +0200 From: Christoph Hellwig <hch@....de> To: unlisted-recipients:; (no To-header on input) Cc: Dan Williams <dan.j.williams@...el.com>, Mike Snitzer <snitzer@...hat.com>, Ira Weiny <ira.weiny@...el.com>, dm-devel@...hat.com, linux-xfs@...r.kernel.org, nvdimm@...ts.linux.dev, linux-s390@...r.kernel.org, linux-fsdevel@...r.kernel.org, linux-erofs@...ts.ozlabs.org, linux-ext4@...r.kernel.org, virtualization@...ts.linux-foundation.org Subject: [PATCH 05/11] dax: move the partition alignment check into fs_dax_get_by_bdev fs_dax_get_by_bdev is the primary interface to find a dax device for a block device, so move the partition alignment check there instead of wiring it up through ->dax_supported. Signed-off-by: Christoph Hellwig <hch@....de> --- drivers/dax/super.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 04fc680542e8d..482fe775324a4 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -93,6 +93,12 @@ struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) if (!blk_queue_dax(bdev->bd_disk->queue)) return NULL; + if ((get_start_sect(bdev) * SECTOR_SIZE) % PAGE_SIZE || + (bdev_nr_sectors(bdev) * SECTOR_SIZE) % PAGE_SIZE) { + pr_info("%pg: error: unaligned partition for dax\n", bdev); + return NULL; + } + id = dax_read_lock(); dax_dev = xa_load(&dax_hosts, (unsigned long)bdev->bd_disk); if (!dax_dev || !dax_alive(dax_dev) || !igrab(&dax_dev->inode)) @@ -107,10 +113,6 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, struct block_device *bdev, int blocksize, sector_t start, sector_t sectors) { - pgoff_t pgoff, pgoff_end; - sector_t last_page; - int err; - if (blocksize != PAGE_SIZE) { pr_info("%pg: error: unsupported blocksize for dax\n", bdev); return false; @@ -121,19 +123,6 @@ bool generic_fsdax_supported(struct dax_device *dax_dev, return false; } - err = bdev_dax_pgoff(bdev, start, PAGE_SIZE, &pgoff); - if (err) { - pr_info("%pg: error: unaligned partition for dax\n", bdev); - return false; - } - - last_page = PFN_DOWN((start + sectors - 1) * 512) * PAGE_SIZE / 512; - err = bdev_dax_pgoff(bdev, last_page, PAGE_SIZE, &pgoff_end); - if (err) { - pr_info("%pg: error: unaligned partition for dax\n", bdev); - return false; - } - return true; } EXPORT_SYMBOL_GPL(generic_fsdax_supported); -- 2.30.2
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