On May 19, 2020, at 11:57 PM, [email protected] wrote: > > From: Ira Weiny <[email protected]> > > 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 <[email protected]> > > --- > 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 */
Please change EXT4_DAX_FL and FS_DAX_FL to use 0x02000000, which is not used
for anything in either case.
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
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