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dax: change bdev_dax_supported() to support boolean returns

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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 <[email protected]>
Signed-off-by: Ross Zwisler <[email protected]>
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Darrick J. Wong <[email protected]>
This commit is contained in:
Dave Jiang 2018-05-30 13:03:46 -07:00 • committed by Darrick J. Wong
commit 80660f2025
6 changed files with 22 additions and 24 deletions
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16
drivers/dax/super.c
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@ -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