linux-ext4 - Re: [PATCH v5 1/3] fs: allow per-device dax status checking for filesystems

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Message-ID: <201802181635.8NJTwrqi%fengguang.wu@intel.com>
Date:   Sun, 18 Feb 2018 16:10:44 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dave Jiang <dave.jiang@...el.com>
Cc:     kbuild-all@...org, darrick.wong@...cle.com,
        linux-nvdimm@...ts.01.org, david@...morbit.com,
        linux-xfs@...r.kernel.org, ross.zwisler@...ux.intel.com,
        linux-ext4@...r.kernel.org, dan.j.williams@...el.com
Subject: Re: [PATCH v5 1/3] fs: allow per-device dax status checking for
 filesystems

Hi Darrick,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.16-rc1 next-20180216]
[cannot apply to dgc-xfs/for-next]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dave-Jiang/minimal-DAX-support-for-XFS-realtime-device/20180218-152445
config: x86_64-randconfig-x008-201807 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> drivers//dax/super.c:85:5: error: redefinition of 'bdev_dax_supported'
    int bdev_dax_supported(struct block_device *bdev, int blocksize)
        ^~~~~~~~~~~~~~~~~~
   In file included from drivers//dax/super.c:23:0:
   include/linux/dax.h:56:19: note: previous definition of 'bdev_dax_supported' was here
    static inline int bdev_dax_supported(struct block_device *bdev,
                      ^~~~~~~~~~~~~~~~~~

vim +/bdev_dax_supported +85 drivers//dax/super.c

    74	
    75	/**
    76	 * bdev_dax_supported() - Check if the device supports dax for filesystem
    77	 * @bdev: block device to check
    78	 * @blocksize: The block size of the device
    79	 *
    80	 * This is a library function for filesystems to check if the block device
    81	 * can be mounted with dax option.
    82	 *
    83	 * Return: negative errno if unsupported, 0 if supported.
    84	 */
  > 85	int bdev_dax_supported(struct block_device *bdev, int blocksize)
    86	{
    87		struct dax_device *dax_dev;
    88		pgoff_t pgoff;
    89		int err, id;
    90		void *kaddr;
    91		pfn_t pfn;
    92		long len;
    93		char buf[BDEVNAME_SIZE];
    94	
    95		if (blocksize != PAGE_SIZE) {
    96			pr_debug("%s: error: unsupported blocksize for dax\n",
    97					bdevname(bdev, buf));
    98			return -EINVAL;
    99		}
   100	
   101		err = bdev_dax_pgoff(bdev, 0, PAGE_SIZE, &pgoff);
   102		if (err) {
   103			pr_debug("%s: error: unaligned partition for dax\n",
   104					bdevname(bdev, buf));
   105			return err;
   106		}
   107	
   108		dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
   109		if (!dax_dev) {
   110			pr_debug("%s: error: device does not support dax\n",
   111					bdevname(bdev, buf));
   112			return -EOPNOTSUPP;
   113		}
   114	
   115		id = dax_read_lock();
   116		len = dax_direct_access(dax_dev, pgoff, 1, &kaddr, &pfn);
   117		dax_read_unlock(id);
   118	
   119		put_dax(dax_dev);
   120	
   121		if (len < 1) {
   122			pr_debug("%s: error: dax access failed (%ld)\n",
   123					bdevname(bdev, buf), len);
   124			return len < 0 ? len : -EIO;
   125		}
   126	
   127		if ((IS_ENABLED(CONFIG_FS_DAX_LIMITED) && pfn_t_special(pfn))
   128				|| pfn_t_devmap(pfn))
   129			/* pass */;
   130		else {
   131			pr_debug("%s: error: dax support not enabled\n",
   132					bdevname(bdev, buf));
   133			return -EOPNOTSUPP;
   134		}
   135	
   136		return 0;
   137	}
   138	EXPORT_SYMBOL_GPL(bdev_dax_supported);
   139	#endif
   140	

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