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authorDave Chinner <dchinner@redhat.com>2016-01-04 16:44:15 +1100
committerDave Chinner <david@fromorbit.com>2016-01-04 16:44:15 +1100
commit58f88ca2df7270881de2034c8286233a89efe71c (patch)
tree216088a0e082b5458f570a31f5507fb63053de1a /fs/xfs
parente7b89481017b2111d188afd70bbd0da9e9b94cc9 (diff)
xfs: introduce per-inode DAX enablement
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>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/libxfs/xfs_format.h9
-rw-r--r--fs/xfs/xfs_inode.c32
-rw-r--r--fs/xfs/xfs_ioctl.c18
-rw-r--r--fs/xfs/xfs_iops.c4
4 files changed, 51 insertions, 12 deletions
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index f28eeabb9454..b4ae7cef028a 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1024,6 +1024,15 @@ static inline void xfs_dinode_put_rdev(struct xfs_dinode *dip, xfs_dev_t rdev)
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
* next agblklog bits - block number in ag
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index ca9ca5a3c535..89299085450e 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -610,7 +610,9 @@ __xfs_iflock(
STATIC uint
_xfs_dic2xflags(
- __uint16_t di_flags)
+ __uint16_t di_flags,
+ uint64_t di_flags2,
+ bool has_attr)
{
uint flags = 0;
@@ -645,25 +647,32 @@ _xfs_dic2xflags(
flags |= FS_XFLAG_FILESTREAM;
}
+ if (di_flags2 & XFS_DIFLAG2_ANY) {
+ if (di_flags2 & XFS_DIFLAG2_DAX)
+ flags |= FS_XFLAG_DAX;
+ }
+
+ if (has_attr)
+ flags |= FS_XFLAG_HASATTR;
+
return flags;
}
uint
xfs_ip2xflags(
- xfs_inode_t *ip)
+ struct xfs_inode *ip)
{
- xfs_icdinode_t *dic = &ip->i_d;
+ struct xfs_icdinode *dic = &ip->i_d;
- return _xfs_dic2xflags(dic->di_flags) |
- (XFS_IFORK_Q(ip) ? FS_XFLAG_HASATTR : 0);
+ return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
}
uint
xfs_dic2xflags(
- xfs_dinode_t *dip)
+ struct xfs_dinode *dip)
{
- return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) |
- (XFS_DFORK_Q(dip) ? FS_XFLAG_HASATTR : 0);
+ return _xfs_dic2xflags(be16_to_cpu(dip->di_flags),
+ be64_to_cpu(dip->di_flags2), XFS_DFORK_Q(dip));
}
/*
@@ -862,7 +871,8 @@ xfs_ialloc(
case S_IFREG:
case S_IFDIR:
if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
- uint di_flags = 0;
+ uint64_t di_flags2 = 0;
+ uint di_flags = 0;
if (S_ISDIR(mode)) {
if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
@@ -898,7 +908,11 @@ xfs_ialloc(
di_flags |= XFS_DIFLAG_NODEFRAG;
if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
di_flags |= XFS_DIFLAG_FILESTREAM;
+ if (pip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
+ di_flags2 |= XFS_DIFLAG2_DAX;
+
ip->i_d.di_flags |= di_flags;
+ ip->i_d.di_flags2 |= di_flags2;
}
/* FALLTHROUGH */
case S_IFLNK:
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 94b35eb32cb6..478d04e07f95 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -945,6 +945,7 @@ xfs_set_diflags(
unsigned int xflags)
{
unsigned int di_flags;
+ uint64_t di_flags2;
/* can't set PREALLOC this way, just preserve it */
di_flags = (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC);
@@ -977,8 +978,18 @@ xfs_set_diflags(
if (xflags & FS_XFLAG_EXTSIZE)
di_flags |= XFS_DIFLAG_EXTSIZE;
}
-
ip->i_d.di_flags = di_flags;
+
+ /* diflags2 only valid for v3 inodes. */
+ if (ip->i_d.di_version < 3)
+ return;
+
+ di_flags2 = 0;
+ if (xflags & FS_XFLAG_DAX)
+ di_flags2 |= XFS_DIFLAG2_DAX;
+
+ ip->i_d.di_flags2 = di_flags2;
+
}
STATIC void
@@ -1004,6 +1015,11 @@ xfs_diflags_to_linux(
inode->i_flags |= S_NOATIME;
else
inode->i_flags &= ~S_NOATIME;
+ if (xflags & FS_XFLAG_DAX)
+ inode->i_flags |= S_DAX;
+ else
+ inode->i_flags &= ~S_DAX;
+
}
static int
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 245268a0cdf0..a1b8af158d05 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1201,8 +1201,8 @@ xfs_diflags_to_iflags(
inode->i_flags |= S_SYNC;
if (flags & XFS_DIFLAG_NOATIME)
inode->i_flags |= S_NOATIME;
- /* XXX: Also needs an on-disk per inode flag! */
- if (ip->i_mount->m_flags & XFS_MOUNT_DAX)
+ if (ip->i_mount->m_flags & XFS_MOUNT_DAX ||
+ ip->i_d.di_flags2 & XFS_DIFLAG2_DAX)
inode->i_flags |= S_DAX;
}