[08/12] xfs: implement the F_IOINFO fcntl

Commit Message

Christoph Hellwig Feb. 28, 2017, 2:57 p.m. UTC

Signed-off-by: Christoph Hellwig <[e-mail]>
---
 fs/xfs/xfs_file.c | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

Patch

diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index a7d8324b59c5..4d955b3266df 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -898,6 +898,39 @@  xfs_file_dedupe_range(
 	return len;
 }
 
+static uint16_t
+xfs_dio_alignment(struct file *file)
+{
+	struct xfs_inode	*ip = XFS_I(file_inode(file));
+	struct xfs_mount	*mp = ip->i_mount;
+
+	if (file->f_flags & O_ATOMIC)
+		return mp->m_sb.sb_blocksize;
+	else if (XFS_IS_REALTIME_INODE(ip))
+		return mp->m_rtdev_targp->bt_logical_sectorsize;
+	else
+		return mp->m_ddev_targp->bt_logical_sectorsize;
+}
+
+static int
+xfs_file_ioinfo(
+	struct file		*file,
+	struct fcntl_ioinfo	*fio)
+{
+	if (file->f_flags & O_DIRECT)
+		fio->fio_alignment = xfs_dio_alignment(file);
+
+	if (file->f_flags & O_ATOMIC) {
+		fio->fio_flags = FIO_FL_ATOMIC_OSYNC | FIO_FL_ATOMIC_FSYNC;
+		fio->fio_max_atomic = INT_MAX;
+		if (fio->fio_alignment)
+			fio->fio_max_atomic &= ~(fio->fio_alignment - 1);
+	}
+
+
+	return 0;
+};
+
 STATIC int
 xfs_file_open(
 	struct inode	*inode,
@@ -1556,6 +1589,7 @@  const struct file_operations xfs_file_operations = {
 	.fallocate	= xfs_file_fallocate,
 	.clone_file_range = xfs_file_clone_range,
 	.dedupe_file_range = xfs_file_dedupe_range,
+	.ioinfo		= xfs_file_ioinfo,
 };
 
 const struct file_operations xfs_dir_file_operations = {