[PATCH 6.1 CANDIDATE 19/19] xfs: respect the stable writes flag on the RT device

From: Christoph Hellwig <[email protected]>

[ Upstream commit 9c04138414c00ae61421f36ada002712c4bac94a ]

Update the per-folio stable writes flag dependening on which device an
inode resides on.

Signed-off-by: Christoph Hellwig <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Darrick J. Wong <[email protected]>
Signed-off-by: Christian Brauner <[email protected]>
Signed-off-by: Leah Rumancik <[email protected]>
---
 fs/xfs/xfs_inode.h | 8 ++++++++
 fs/xfs/xfs_ioctl.c | 8 ++++++++
 fs/xfs/xfs_iops.c  | 7 +++++++
 3 files changed, 23 insertions(+)

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 3a81477c7797..c177c92f3aa5 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -567,10 +567,18 @@ int	xfs_break_layouts(struct inode *inode, uint *iolock,
 /* from xfs_iops.c */
 extern void xfs_setup_inode(struct xfs_inode *ip);
 extern void xfs_setup_iops(struct xfs_inode *ip);
 extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init);
 
+static inline void xfs_update_stable_writes(struct xfs_inode *ip)
+{
+	if (bdev_stable_writes(xfs_inode_buftarg(ip)->bt_bdev))
+		mapping_set_stable_writes(VFS_I(ip)->i_mapping);
+	else
+		mapping_clear_stable_writes(VFS_I(ip)->i_mapping);
+}
+
 /*
  * When setting up a newly allocated inode, we need to call
  * xfs_finish_inode_setup() once the inode is fully instantiated at
  * the VFS level to prevent the rest of the world seeing the inode
  * before we've completed instantiation. Otherwise we can do it
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index f6aa9e6138ae..c7cb496dc345 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1151,10 +1151,18 @@ xfs_ioctl_setattr_xflags(
 
 	ip->i_diflags = xfs_flags2diflags(ip, fa->fsx_xflags);
 	ip->i_diflags2 = i_flags2;
 
 	xfs_diflags_to_iflags(ip, false);
+
+	/*
+	 * Make the stable writes flag match that of the device the inode
+	 * resides on when flipping the RT flag.
+	 */
+	if (rtflag != XFS_IS_REALTIME_INODE(ip) && S_ISREG(VFS_I(ip)->i_mode))
+		xfs_update_stable_writes(ip);
+
 	xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_CHG);
 	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 	XFS_STATS_INC(mp, xs_ig_attrchg);
 	return 0;
 }
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index 2e10e1c66ad6..6fbdc0a19e54 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -1289,10 +1289,17 @@ xfs_setup_inode(
 	 * stacks or deadlocking.
 	 */
 	gfp_mask = mapping_gfp_mask(inode->i_mapping);
 	mapping_set_gfp_mask(inode->i_mapping, (gfp_mask & ~(__GFP_FS)));
 
+	/*
+	 * For real-time inodes update the stable write flags to that of the RT
+	 * device instead of the data device.
+	 */
+	if (S_ISREG(inode->i_mode) && XFS_IS_REALTIME_INODE(ip))
+		xfs_update_stable_writes(ip);
+
 	/*
 	 * If there is no attribute fork no ACL can exist on this inode,
 	 * and it can't have any file capabilities attached to it either.
 	 */
 	if (!xfs_inode_has_attr_fork(ip)) {
-- 
2.48.1.262.g85cc9f2d1e-goog