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dax: Add block size note to documentation

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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@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Matthew Wilcox 2015-07-03 10:40:38 -04:00 committed by Al Viro
parent 5ba97d2832
commit 44f4c054ca
1 changed files with 4 additions and 2 deletions
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6
Documentation/filesystems/dax.txt
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@ -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