[PATCH 11/12] block_dev: implement the F_IOINFO fcntl

[Christoph Hellwig]

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
 fs/block_dev.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/fs/block_dev.c b/fs/block_dev.c
index 4dd5c54cdefb..48a799964e1d 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -2116,6 +2116,26 @@ static long blkdev_fallocate(struct file *file, int 
mode, loff_t start,
                                             end >> PAGE_SHIFT);
 }
 
+static int blkdev_ioinfo(struct file *file, struct fcntl_ioinfo *fio)
+{
+       struct block_device *bdev = I_BDEV(bdev_file_inode(file));
+       struct request_queue *q = bdev_get_queue(bdev);
+       unsigned int atomic_sectors = queue_max_atomic_write_sectors(q);
+
+       if (file->f_flags & O_DIRECT) {
+               fio->fio_alignment = bdev_logical_block_size(bdev);
+
+               if ((file->f_flags & O_ATOMIC) && atomic_sectors) {
+                       fio->fio_flags = FIO_FL_ATOMIC_OSYNC;
+                       fio->fio_max_atomic = (atomic_sectors << 9);
+                       if (fio->fio_alignment)
+                               fio->fio_max_atomic &= ~(fio->fio_alignment - 
1);
+               }
+       }
+
+       return 0;
+};
+
 const struct file_operations def_blk_fops = {
        .open           = blkdev_open,
        .release        = blkdev_close,
@@ -2131,6 +2151,7 @@ const struct file_operations def_blk_fops = {
        .splice_read    = generic_file_splice_read,
        .splice_write   = iter_file_splice_write,
        .fallocate      = blkdev_fallocate,
+       .ioinfo         = blkdev_ioinfo,
 };
 
 int ioctl_by_bdev(struct block_device *bdev, unsigned cmd, unsigned long arg)
-- 
2.11.0