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xfs: introduce per-inode DAX enablement

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Rather than just being able to turn DAX on and off via a mount
option, some applications may only want to enable DAX for certain
performance critical files in a filesystem.

This patch introduces a new inode flag to enable DAX in the v3 inode
di_flags2 field. It adds support for setting and clearing flags in
the di_flags2 field via the XFS_IOC_FSSETXATTR ioctl, and sets the
S_DAX inode flag appropriately when it is seen.

When this flag is set on a directory, it acts as an "inherit flag".
That is, inodes created in the directory will automatically inherit
the on-disk inode DAX flag, enabling administrators to set up
directory heirarchies that automatically use DAX. Setting this flag
on an empty root directory will make the entire filesystem use DAX
by default.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Dave Chinner
2016-01-04 16:44:15 +11:00
committed by Dave Chinner
parent e7b8948101
commit 58f88ca2df
5 changed files with 52 additions and 12 deletions
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9
fs/xfs/libxfs/xfs_format.h
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@@ -1023,6 +1023,15 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
XFS_DIFLAG_PROJINHERIT | XFS_DIFLAG_NOSYMLINKS | XFS_DIFLAG_EXTSIZE | \
XFS_DIFLAG_EXTSZINHERIT | XFS_DIFLAG_NODEFRAG | XFS_DIFLAG_FILESTREAM)
/*
* Values for di_flags2 These start by being exposed to userspace in the upper
* 16 bits of the XFS_XFLAG_s range.
*/
#define XFS_DIFLAG2_DAX_BIT 0 /* use DAX for this inode */
#define XFS_DIFLAG2_DAX (1 << XFS_DIFLAG2_DAX_BIT)
#define XFS_DIFLAG2_ANY (XFS_DIFLAG2_DAX)
/*
* Inode number format:
* low inopblog bits - offset in block