[PATCH 8/8] udf: stop using ioctl_by_bdev

[Christoph Hellwig]

Instead just call the CDROM layer functionality directly.

Signed-off-by: Christoph Hellwig <h...@lst.de>
Reviewed-by: Jan Kara <j...@suse.cz>
Reviewed-by: Damien Le Moal <damien.lem...@wdc.com>
Reviewed-by: Hannes Reinecke <h...@suse.de>
---
 fs/udf/lowlevel.c | 29 +++++++++++++----------------
 1 file changed, 13 insertions(+), 16 deletions(-)

diff --git a/fs/udf/lowlevel.c b/fs/udf/lowlevel.c
index 5c7ec121990da..f1094cdcd6cde 100644
--- a/fs/udf/lowlevel.c
+++ b/fs/udf/lowlevel.c
@@ -27,41 +27,38 @@
 
 unsigned int udf_get_last_session(struct super_block *sb)
 {
+       struct cdrom_device_info *cdi = disk_to_cdi(sb->s_bdev->bd_disk);
        struct cdrom_multisession ms_info;
-       unsigned int vol_desc_start;
-       struct block_device *bdev = sb->s_bdev;
-       int i;
 
-       vol_desc_start = 0;
-       ms_info.addr_format = CDROM_LBA;
-       i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long)&ms_info);
+       if (!cdi) {
+               udf_debug("CDROMMULTISESSION not supported.\n");
+               return 0;
+       }
 
-       if (i == 0) {
+       ms_info.addr_format = CDROM_LBA;
+       if (cdrom_multisession(cdi, &ms_info) == 0) {
                udf_debug("XA disk: %s, vol_desc_start=%d\n",
                          ms_info.xa_flag ? "yes" : "no", ms_info.addr.lba);
                if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
-                       vol_desc_start = ms_info.addr.lba;
-       } else {
-               udf_debug("CDROMMULTISESSION not supported: rc=%d\n", i);
+                       return ms_info.addr.lba;
        }
-       return vol_desc_start;
+       return 0;
 }
 
 unsigned long udf_get_last_block(struct super_block *sb)
 {
        struct block_device *bdev = sb->s_bdev;
+       struct cdrom_device_info *cdi = disk_to_cdi(bdev->bd_disk);
        unsigned long lblock = 0;
 
        /*
-        * ioctl failed or returned obviously bogus value?
+        * The cdrom layer call failed or returned obviously bogus value?
         * Try using the device size...
         */
-       if (ioctl_by_bdev(bdev, CDROM_LAST_WRITTEN, (unsigned long) &lblock) ||
-           lblock == 0)
+       if (!cdi || cdrom_get_last_written(cdi, &lblock) || lblock == 0)
                lblock = i_size_read(bdev->bd_inode) >> sb->s_blocksize_bits;
 
        if (lblock)
                return lblock - 1;
-       else
-               return 0;
+       return 0;
 }
-- 
2.26.2