On Wed, May 20, 2020 at 01:26:44PM -0600, Andreas Dilger wrote:
> On May 19, 2020, at 11:57 PM, ira.weiny@xxxxxxxxx wrote:
> >
> > From: Ira Weiny <ira.weiny@xxxxxxxxx>
> >
> > Add a flag to preserve FS_XFLAG_DAX in the ext4 inode.
> >
> > Set the flag to be user visible and changeable. Set the flag to be
> > inherited. Allow applications to change the flag at any time with the
> > exception of if VERITY or ENCRYPT is set.
> >
> > Disallow setting VERITY or ENCRYPT if DAX is set.
> >
> > Finally, on regular files, flag the inode to not be cached to facilitate
> > changing S_DAX on the next creation of the inode.
> >
> > Signed-off-by: Ira Weiny <ira.weiny@xxxxxxxxx>
> >
> > ---
> > diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> > index 6235440e4c39..467c30a789b6 100644
> > --- a/fs/ext4/ext4.h
> > +++ b/fs/ext4/ext4.h
> > @@ -415,13 +415,16 @@ struct flex_groups {
> > #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
> > #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
> > /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
> > +
> > +#define EXT4_DAX_FL 0x01000000 /* Inode is DAX */
> > +
> > #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
> > #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
> > #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded file */
> > #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
>
> Hi Ira,
> This flag value conflicts with the reserved flag in e2fsprogs for snapshots:
>
> #define EXT4_SNAPFILE_FL 0x01000000 /* Inode is a snapshot */
Sure NP but is that new? I'm building off of 5.7-rc4.
Just curious if I completely missed something.
>
> Please change EXT4_DAX_FL and FS_DAX_FL to use 0x02000000, which is not used
> for anything in either case.
NP, thanks!
Ira
>
> Cheers, Andreas
>
>
> > diff --git a/include/uapi/linux/fs.h b/include/uapi/linux/fs.h
> > index 379a612f8f1d..7c5f6eb51e2d 100644
> > --- a/include/uapi/linux/fs.h
> > +++ b/include/uapi/linux/fs.h
> > @@ -262,6 +262,7 @@ struct fsxattr {
> > #define FS_EA_INODE_FL 0x00200000 /* Inode used for large EA */
> > #define FS_EOFBLOCKS_FL 0x00400000 /* Reserved for ext4 */
> > #define FS_NOCOW_FL 0x00800000 /* Do not cow file */
> > +#define FS_DAX_FL 0x01000000 /* Inode is DAX */
> > #define FS_INLINE_DATA_FL 0x10000000 /* Reserved for ext4 */
> > #define FS_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
> > #define FS_CASEFOLD_FL 0x40000000 /* Folder is case insensitive */
> > --
> > 2.25.1
> >
>
>
> Cheers, Andreas
>
>
>
>
>
