Commit 44f4c054 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by Al Viro

dax: Add block size note to documentation

For block devices which are small enough, mkfs will default to creating
a filesystem with block sizes smaller than page size.
Signed-off-by: default avatarMatthew Wilcox <>
Signed-off-by: default avatarAl Viro <>
parent 5ba97d28
......@@ -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
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