[PATCH 3/4] io_uring: add ->needs_fs to the opcode requirements table

[Jens Axboe <axboe@kernel.dk>]

Set it for openat/openat2/statx, as they all potentially need relative
path lookups if AT_FDCWD is used.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index da6a5998fa30..957de0f99bcd 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -616,6 +616,8 @@ struct io_op_def {
 	unsigned		not_supported : 1;
 	/* needs file table */
 	unsigned		file_table : 1;
+	/* needs ->fs assigned */
+	unsigned		needs_fs : 1;
 };
 
 static const struct io_op_def io_op_defs[] = {
@@ -694,6 +696,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.fd_non_neg		= 1,
 		.file_table		= 1,
+		.needs_fs		= 1,
 	},
 	[IORING_OP_CLOSE] = {
 		.needs_file		= 1,
@@ -707,6 +710,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_mm		= 1,
 		.needs_file		= 1,
 		.fd_non_neg		= 1,
+		.needs_fs		= 1,
 	},
 	[IORING_OP_READ] = {
 		.needs_mm		= 1,
@@ -738,6 +742,7 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.fd_non_neg		= 1,
 		.file_table		= 1,
+		.needs_fs		= 1,
 	},
 	[IORING_OP_EPOLL_CTL] = {
 		.unbound_nonreg_file	= 1,
@@ -911,6 +916,8 @@ static inline void io_req_work_grab_env(struct io_kiocb *req,
 	}
 	if (!req->work.creds)
 		req->work.creds = get_current_cred();
+	if (!req->work.fs && def->needs_fs)
+		req->work.fs = req->ctx->fs;
 }
 
 static inline void io_req_work_drop_env(struct io_kiocb *req)
-- 
2.25.0