io_uring: unify fsize with def->work_flags

This one was missed in the earlier conversion, should be included like
any of the other IO identity flags. Make sure we restore to RLIM_INIFITY
when dropping the personality again.

Fixes: 98447d6 ("io_uring: move io identity items into separate struct")
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: axboe

fs/io-wq.c

@@ -187,7 +187,8 @@ static bool __io_worker_unuse(struct io_wqe *wqe, struct io_worker *worker)
 		worker->blkcg_css = NULL;
 	}
 #endif
-
+	if (current->signal->rlim[RLIMIT_FSIZE].rlim_cur != RLIM_INFINITY)
+		current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 	return dropped_lock;
 }
 
@@ -483,7 +484,10 @@ static void io_impersonate_work(struct io_worker *worker,
 	if ((work->flags & IO_WQ_WORK_CREDS) &&
 	    worker->cur_creds != work->identity->creds)
 		io_wq_switch_creds(worker, work);
-	current->signal->rlim[RLIMIT_FSIZE].rlim_cur = work->identity->fsize;
+	if (work->flags & IO_WQ_WORK_FSIZE)
+		current->signal->rlim[RLIMIT_FSIZE].rlim_cur = work->identity->fsize;
+	else if (current->signal->rlim[RLIMIT_FSIZE].rlim_cur != RLIM_INFINITY)
+		current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
 	io_wq_switch_blkcg(worker, work);
 #ifdef CONFIG_AUDIT
 	current->loginuid = work->identity->loginuid;

fs/io-wq.h

@@ -17,6 +17,7 @@ enum {
 	IO_WQ_WORK_MM		= 128,
 	IO_WQ_WORK_CREDS	= 256,
 	IO_WQ_WORK_BLKCG	= 512,
+	IO_WQ_WORK_FSIZE	= 1024,
 
 	IO_WQ_HASH_SHIFT	= 24,	/* upper 8 bits are used for hash key */
 };

fs/io_uring.c

@@ -753,8 +753,6 @@ struct io_op_def {
 	unsigned		pollout : 1;
 	/* op supports buffer selection */
 	unsigned		buffer_select : 1;
-	/* needs rlimit(RLIMIT_FSIZE) assigned */
-	unsigned		needs_fsize : 1;
 	/* must always have async data allocated */
 	unsigned		needs_async_data : 1;
 	/* size of async data needed, if any */
@@ -778,10 +776,10 @@ static const struct io_op_def io_op_defs[] = {
 		.hash_reg_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.pollout		= 1,
-		.needs_fsize		= 1,
 		.needs_async_data	= 1,
 		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
+						IO_WQ_WORK_FSIZE,
 	},
 	[IORING_OP_FSYNC] = {
 		.needs_file		= 1,
@@ -799,9 +797,8 @@ static const struct io_op_def io_op_defs[] = {
 		.hash_reg_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.pollout		= 1,
-		.needs_fsize		= 1,
 		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE,
 	},
 	[IORING_OP_POLL_ADD] = {
 		.needs_file		= 1,
@@ -859,8 +856,7 @@ static const struct io_op_def io_op_defs[] = {
 	},
 	[IORING_OP_FALLOCATE] = {
 		.needs_file		= 1,
-		.needs_fsize		= 1,
-		.work_flags		= IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE,
 	},
 	[IORING_OP_OPENAT] = {
 		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG |
@@ -890,9 +886,9 @@ static const struct io_op_def io_op_defs[] = {
 		.needs_file		= 1,
 		.unbound_nonreg_file	= 1,
 		.pollout		= 1,
-		.needs_fsize		= 1,
 		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
+		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
+						IO_WQ_WORK_FSIZE,
 	},
 	[IORING_OP_FADVISE] = {
 		.needs_file		= 1,
@@ -1293,8 +1289,11 @@ static bool io_grab_identity(struct io_kiocb *req)
 	struct io_identity *id = req->work.identity;
 	struct io_ring_ctx *ctx = req->ctx;
 
-	if (def->needs_fsize && id->fsize != rlimit(RLIMIT_FSIZE))
-		return false;
+	if (def->work_flags & IO_WQ_WORK_FSIZE) {
+		if (id->fsize != rlimit(RLIMIT_FSIZE))
+			return false;
+		req->work.flags |= IO_WQ_WORK_FSIZE;
+	}
 
 	if (!(req->work.flags & IO_WQ_WORK_FILES) &&
 	    (def->work_flags & IO_WQ_WORK_FILES) &&