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Date: Fri, 3 Jul 2015 10:40:38 -0400 From: Matthew Wilcox <matthew.r.wilcox@...el.com> To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, Alexander Viro <viro@...iv.linux.org.uk> Cc: Matthew Wilcox <willy@...ux.intel.com> Subject: [PATCH v2 1/6] dax: Add block size note to documentation From: Matthew Wilcox <willy@...ux.intel.com> For block devices which are small enough, mkfs will default to creating a filesystem with block sizes smaller than page size. Signed-off-by: Matthew Wilcox <willy@...ux.intel.com> --- Documentation/filesystems/dax.txt | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index baf4111..7af2851 100644 --- a/Documentation/filesystems/dax.txt +++ b/Documentation/filesystems/dax.txt @@ -18,8 +18,10 @@ Usage ----- If you have a block device which supports DAX, you can make a filesystem -on it as usual. When mounting it, use the -o dax option manually -or add 'dax' to the options in /etc/fstab. +on it as usual. The DAX code currently only supports files with a block +size equal to your kernel's PAGE_SIZE, so you may need to specify a block +size when creating the filesystem. When mounting it, use the "-o dax" +option on the command line or add 'dax' to the options in /etc/fstab. Implementation Tips for Block Driver Writers -- 2.1.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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