io_uring: Change res2 parameter type in io_uring_cmd_done

JIRA: https://issues.redhat.com/browse/RHEL-105612

commit a07d2d7
Author: Bernd Schubert <bschubert@ddn.com>
Date:   Tue Dec 3 11:31:05 2024 +0100

    io_uring: Change res2 parameter type in io_uring_cmd_done
    
    Change the type of the res2 parameter in io_uring_cmd_done from ssize_t
    to u64. This aligns the parameter type with io_req_set_cqe32_extra,
    which expects u64 arguments.
    The change eliminates potential issues on 32-bit architectures where
    ssize_t might be 32-bit.
    
    Only user of passing res2 is drivers/nvme/host/ioctl.c and it actually
    passes u64.
    
    Fixes: ee692a2 ("fs,io_uring: add infrastructure for uring-cmd")
    Cc: stable@vger.kernel.org
    Reviewed-by: Kanchan Joshi <joshi.k@samsung.com>
    Tested-by: Li Zetao <lizetao1@huawei.com>
    Reviewed-by: Li Zetao <lizetao1@huawei.com>
    Signed-off-by: Bernd Schubert <bschubert@ddn.com>
    Link: https://lore.kernel.org/r/20241203-io_uring_cmd_done-res2-as-u64-v2-1-5e59ae617151@ddn.com
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Jeff Moyer <jmoyer@redhat.com>

Author: JeffMoyer

include/linux/io_uring/cmd.h

@@ -44,7 +44,7 @@ int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
  * Note: the caller should never hard code @issue_flags and is only allowed
  * to pass the mask provided by the core io_uring code.
  */
-void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, ssize_t res2,
+void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret, u64 res2,
 			unsigned issue_flags);
 
 void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,
@@ -69,7 +69,7 @@ static inline int io_uring_cmd_import_fixed(u64 ubuf, unsigned long len, int rw,
 	return -EOPNOTSUPP;
 }
 static inline void io_uring_cmd_done(struct io_uring_cmd *cmd, ssize_t ret,
-		ssize_t ret2, unsigned issue_flags)
+		u64 ret2, unsigned issue_flags)
 {
 }
 static inline void __io_uring_cmd_do_in_task(struct io_uring_cmd *ioucmd,

io_uring/uring_cmd.c

@@ -151,7 +151,7 @@ static inline void io_req_set_cqe32_extra(struct io_kiocb *req,
  * Called by consumers of io_uring_cmd, if they originally returned
  * -EIOCBQUEUED upon receiving the command.
  */
-void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, ssize_t res2,
+void io_uring_cmd_done(struct io_uring_cmd *ioucmd, ssize_t ret, u64 res2,
 		       unsigned issue_flags)
 {
 	struct io_kiocb *req = cmd_to_io_kiocb(ioucmd);