zonefs: Fix file size of zones in full condition

Per ZBC/ZAC/ZNS specifications, write pointers may not have valid values
when zones are in full condition. However, when zonefs mounts a zoned
block device, zonefs refers write pointers to set file size even when
the zones are in full condition. This results in wrong file size. To fix
this, refer maximum file size in place of write pointers for zones in
full condition.

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Fixes: 8dcc1a9d90c1 ("fs: New zonefs file system")
Cc: <stable@vger.kernel.org> # 5.6+
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>

diff --git a/fs/zonefs/super.c b/fs/zonefs/super.c
index 96f0cb0c29aab783550267a8bab71de4712df6f4..2e2a234d387bef4278616780b86d6083852c5906 100644 (file)
--- a/fs/zonefs/super.c
+++ b/fs/zonefs/super.c
@@ -256,6 +256,9 @@ static loff_t zonefs_check_zone_condition(struct inode *inode,
                }
                inode->i_mode &= ~0222;
                return i_size_read(inode);
+       case BLK_ZONE_COND_FULL:
+               /* The write pointer of full zones is invalid. */
+               return zi->i_max_size;
        default:
                if (zi->i_ztype == ZONEFS_ZTYPE_CNV)
                        return zi->i_max_size;