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| author | Matthew Wilcox <willy@linux.intel.com> | 2015-07-03 10:40:38 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-07-04 15:56:56 -0400 |
| commit | 44f4c054cae646a9296da05cdfe7d6e786f73d46 (patch) | |
| tree | 1c949c4243649dd33474f65de8436dfe9591e884 /Documentation | |
| parent | 5ba97d2832f87943c43bb69cb1ef86dbc59df5bc (diff) | |
| download | linux-44f4c054cae646a9296da05cdfe7d6e786f73d46.tar.gz linux-44f4c054cae646a9296da05cdfe7d6e786f73d46.tar.bz2 linux-44f4c054cae646a9296da05cdfe7d6e786f73d46.zip | |
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: Matthew Wilcox <willy@linux.intel.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/filesystems/dax.txt | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/Documentation/filesystems/dax.txt b/Documentation/filesystems/dax.txt index baf41118660d..7af2851d667c 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 |