On Tue 12-05-20 22:43:20, [email protected] wrote: > From: Ira Weiny <[email protected]> > > S_DAX should only be enabled when the underlying block device supports > dax. > > Change ext4_should_use_dax() to check for device support prior to the > over riding mount option. > > While we are at it change the function to ext4_should_enable_dax() as > this better reflects the ask as well as matches xfs. > > Signed-off-by: Ira Weiny <[email protected]>
The patch looks good to me. You can add: Reviewed-by: Jan Kara <[email protected]> Honza > > --- > Changes from RFC > Change function name to 'should enable' > Clean up bool conversion > Reorder this for better bisect-ability > --- > fs/ext4/inode.c | 14 +++++++++----- > 1 file changed, 9 insertions(+), 5 deletions(-) > > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > index a10ff12194db..d3a4c2ed7a1c 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -4398,10 +4398,8 @@ int ext4_get_inode_loc(struct inode *inode, struct > ext4_iloc *iloc) > !ext4_test_inode_state(inode, EXT4_STATE_XATTR)); > } > > -static bool ext4_should_use_dax(struct inode *inode) > +static bool ext4_should_enable_dax(struct inode *inode) > { > - if (!test_opt(inode->i_sb, DAX_ALWAYS)) > - return false; > if (!S_ISREG(inode->i_mode)) > return false; > if (ext4_should_journal_data(inode)) > @@ -4412,7 +4410,13 @@ static bool ext4_should_use_dax(struct inode *inode) > return false; > if (ext4_test_inode_flag(inode, EXT4_INODE_VERITY)) > return false; > - return true; > + if (!bdev_dax_supported(inode->i_sb->s_bdev, > + inode->i_sb->s_blocksize)) > + return false; > + if (test_opt(inode->i_sb, DAX_ALWAYS)) > + return true; > + > + return false; > } > > void ext4_set_inode_flags(struct inode *inode) > @@ -4430,7 +4434,7 @@ void ext4_set_inode_flags(struct inode *inode) > new_fl |= S_NOATIME; > if (flags & EXT4_DIRSYNC_FL) > new_fl |= S_DIRSYNC; > - if (ext4_should_use_dax(inode)) > + if (ext4_should_enable_dax(inode)) > new_fl |= S_DAX; > if (flags & EXT4_ENCRYPT_FL) > new_fl |= S_ENCRYPTED; > -- > 2.25.1 > -- Jan Kara <[email protected]> SUSE Labs, CR
