On Tue 29-09-15 15:48:11, Dan Williams wrote: > Similar to XFS warn when mounting DAX while it is still considered under > development. Also, aspects of the DAX implementation, for example > synchronization against multiple faults and faults causing block > allocation, depend on the correct implementation in the filesystem. The > maturity of a given DAX implementation is filesystem specific. > > Cc: Jan Kara <jack@xxxxxxxx> > Cc: "Theodore Ts'o" <tytso@xxxxxxx> > Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx> > Cc: Matthew Wilcox <willy@xxxxxxxxxxxxxxx> > Cc: linux-ext4@xxxxxxxxxxxxxxx > Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> > Reported-by: Dave Chinner <david@xxxxxxxxxxxxx> > Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx> Agreed. You can add: Acked-by: Jan Kara <jack@xxxxxxxx> Honza > --- > Given the pending investigations [1], and rather than marking FS_DAX > broken, warn about DAX usage until we've landed fixes for the issues > that Dave has identified. > > [1]: https://lists.01.org/pipermail/linux-nvdimm/2015-September/002266.html > > fs/ext2/super.c | 2 ++ > fs/ext4/super.c | 6 +++++- > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/fs/ext2/super.c b/fs/ext2/super.c > index 900e19cf9ef6..2597b0663bf2 100644 > --- a/fs/ext2/super.c > +++ b/fs/ext2/super.c > @@ -566,6 +566,8 @@ static int parse_options(char *options, struct super_block *sb) > /* Fall through */ > case Opt_dax: > #ifdef CONFIG_FS_DAX > + ext2_msg(sb, KERN_WARNING, > + "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); > set_opt(sbi->s_mount_opt, DAX); > #else > ext2_msg(sb, KERN_INFO, "dax option not supported"); > diff --git a/fs/ext4/super.c b/fs/ext4/super.c > index a63c7b0a10cf..4db6eb0b6979 100644 > --- a/fs/ext4/super.c > +++ b/fs/ext4/super.c > @@ -1656,8 +1656,12 @@ static int handle_mount_opt(struct super_block *sb, char *opt, int token, > } > sbi->s_jquota_fmt = m->mount_opt; > #endif > -#ifndef CONFIG_FS_DAX > } else if (token == Opt_dax) { > +#ifdef CONFIG_FS_DAX > + ext4_msg(sb, KERN_WARNING, > + "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); > + sbi->s_mount_opt |= m->mount_opt; > +#else > ext4_msg(sb, KERN_INFO, "dax option not supported"); > return -1; > #endif > > -- Jan Kara <jack@xxxxxxxx> SUSE Labs, CR -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
