[PATCH 5/9] dax: move the dax_read_lock() locking into dax_supported
From: Christoph Hellwig <hch@lst.de>
Date: 2021-08-23 12:41:03
Also in:
linux-fsdevel, linux-xfs, nvdimm
Subsystem:
device direct access (dax), device-mapper (lvm), the rest · Maintainers:
Dan Williams, Vishal Verma, Dave Jiang, Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Linus Torvalds
Move the dax_read_lock/dax_read_unlock pair from the callers into dax_supported to make it a little easier to use. Signed-off-by: Christoph Hellwig <hch@lst.de> --- drivers/dax/super.c | 16 +++++++++------- drivers/md/dm-table.c | 9 ++------- 2 files changed, 11 insertions(+), 14 deletions(-)
diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index e13fde57c33e..0f74f83101ab 100644
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c@@ -219,7 +219,6 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize) struct request_queue *q; char buf[BDEVNAME_SIZE]; bool ret; - int id; q = bdev_get_queue(bdev); if (!q || !blk_queue_dax(q)) {
@@ -235,10 +234,8 @@ bool __bdev_dax_supported(struct block_device *bdev, int blocksize) return false; } - id = dax_read_lock(); ret = dax_supported(dax_dev, bdev, blocksize, 0, i_size_read(bdev->bd_inode) / 512); - dax_read_unlock(id); put_dax(dax_dev);
@@ -356,13 +353,18 @@ EXPORT_SYMBOL_GPL(dax_direct_access); bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev, int blocksize, sector_t start, sector_t len) { - if (!dax_dev) - return false; + bool ret = false; + int id; - if (!dax_alive(dax_dev)) + if (!dax_dev) return false; - return dax_dev->ops->dax_supported(dax_dev, bdev, blocksize, start, len); + id = dax_read_lock(); + if (dax_alive(dax_dev)) + ret = dax_dev->ops->dax_supported(dax_dev, bdev, blocksize, + start, len); + dax_read_unlock(id); + return ret; } EXPORT_SYMBOL_GPL(dax_supported);
diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c
index 0543cdf89e92..b53acca37581 100644
--- a/drivers/md/dm-table.c
+++ b/drivers/md/dm-table.c@@ -809,14 +809,9 @@ EXPORT_SYMBOL_GPL(dm_table_set_type); int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev, sector_t start, sector_t len, void *data) { - int blocksize = *(int *) data, id; - bool rc; + int blocksize = *(int *) data; - id = dax_read_lock(); - rc = !dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len); - dax_read_unlock(id); - - return rc; + return !dax_supported(dev->dax_dev, dev->bdev, blocksize, start, len); } /* Check devices support synchronous DAX */
--
2.30.2