From 80660f20252d6f76c9f203874ad7c7a4a8508cf8 Mon Sep 17 00:00:00 2001 From: Dave Jiang Date: Wed, 30 May 2018 13:03:46 -0700 Subject: dax: change bdev_dax_supported() to support boolean returns The function return values are confusing with the way the function is named. We expect a true or false return value but it actually returns 0/-errno. This makes the code very confusing. Changing the return values to return a bool where if DAX is supported then return true and no DAX support returns false. Signed-off-by: Dave Jiang Signed-off-by: Ross Zwisler Reviewed-by: Darrick J. Wong Signed-off-by: Darrick J. Wong --- drivers/dax/super.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'drivers/dax') diff --git a/drivers/dax/super.c b/drivers/dax/super.c index 3943feb9a090..1d7bd96511f0 100644 --- a/drivers/dax/super.c +++ b/drivers/dax/super.c @@ -80,9 +80,9 @@ EXPORT_SYMBOL_GPL(fs_dax_get_by_bdev); * This is a library function for filesystems to check if the block device * can be mounted with dax option. * - * Return: negative errno if unsupported, 0 if supported. + * Return: true if supported, false if unsupported */ -int __bdev_dax_supported(struct block_device *bdev, int blocksize) +bool __bdev_dax_supported(struct block_device *bdev, int blocksize) { struct dax_device *dax_dev; pgoff_t pgoff; @@ -95,21 +95,21 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize) if (blocksize != PAGE_SIZE) { pr_debug("%s: error: unsupported blocksize for dax\n", bdevname(bdev, buf)); - return -EINVAL; + return false; } err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff); if (err) { pr_debug("%s: error: unaligned partition for dax\n", bdevname(bdev, buf)); - return err; + return false; } dax_dev = dax_get_by_host(bdev->bd_disk->disk_name); if (!dax_dev) { pr_debug("%s: error: device does not support dax\n", bdevname(bdev, buf)); - return -EOPNOTSUPP; + return false; } id = dax_read_lock(); @@ -121,7 +121,7 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize) if (len < 1) { pr_debug("%s: error: dax access failed (%ld)\n", bdevname(bdev, buf), len); - return len < 0 ? len : -EIO; + return false; } if (IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn)) { @@ -139,10 +139,10 @@ int __bdev_dax_supported(struct block_device *bdev, int blocksize) } else { pr_debug("%s: error: dax support not enabled\n", bdevname(bdev, buf)); - return -EOPNOTSUPP; + return false; } - return 0; + return true; } EXPORT_SYMBOL_GPL(__bdev_dax_supported); #endif -- cgit