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From: adam.manzanares@wdc.com
To: viro@zeniv.linux.org.uk, bcrl@kvack.org
Cc: linux-fsdevel@vger.kernel.org, linux-aio@kvack.org,
	linux-api@vger.kernel.org, linux-block@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Adam Manzanares <adam.manzanares@wdc.com>
Subject: [PATCH v3 1/3] block: add ioprio_check_cap function
Date: Tue,  8 May 2018 10:42:00 -0700	[thread overview]
Message-ID: <20180508174202.2537-2-adam.manzanares@wdc.com> (raw)
In-Reply-To: <20180508174202.2537-1-adam.manzanares@wdc.com>

From: Adam Manzanares <adam.manzanares@wdc.com>

Aio per command iopriority support introduces a second interface between
userland and the kernel capable of passing iopriority. The aio interface also
needs the ability to verify that the submitting context has sufficient
priviledges to submit IOPRIO_RT commands. This patch creates the
ioprio_check_cap function to be used by the ioprio_set system call and also by
the aio interface.

Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
---
 block/ioprio.c         | 22 ++++++++++++++++------
 include/linux/ioprio.h |  2 ++
 2 files changed, 18 insertions(+), 6 deletions(-)

diff --git a/block/ioprio.c b/block/ioprio.c
index 6f5d0b6625e3..f9821080c92c 100644
--- a/block/ioprio.c
+++ b/block/ioprio.c
@@ -61,15 +61,10 @@ int set_task_ioprio(struct task_struct *task, int ioprio)
 }
 EXPORT_SYMBOL_GPL(set_task_ioprio);
 
-SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
+int ioprio_check_cap(int ioprio)
 {
 	int class = IOPRIO_PRIO_CLASS(ioprio);
 	int data = IOPRIO_PRIO_DATA(ioprio);
-	struct task_struct *p, *g;
-	struct user_struct *user;
-	struct pid *pgrp;
-	kuid_t uid;
-	int ret;
 
 	switch (class) {
 		case IOPRIO_CLASS_RT:
@@ -92,6 +87,21 @@ SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
 			return -EINVAL;
 	}
 
+	return 0;
+}
+
+SYSCALL_DEFINE3(ioprio_set, int, which, int, who, int, ioprio)
+{
+	struct task_struct *p, *g;
+	struct user_struct *user;
+	struct pid *pgrp;
+	kuid_t uid;
+	int ret;
+
+	ret = ioprio_check_cap(ioprio);
+	if (ret)
+		return ret;
+
 	ret = -ESRCH;
 	rcu_read_lock();
 	switch (which) {
diff --git a/include/linux/ioprio.h b/include/linux/ioprio.h
index 627efac73e6d..4a28cec49ec3 100644
--- a/include/linux/ioprio.h
+++ b/include/linux/ioprio.h
@@ -77,4 +77,6 @@ extern int ioprio_best(unsigned short aprio, unsigned short bprio);
 
 extern int set_task_ioprio(struct task_struct *task, int ioprio);
 
+extern int ioprio_check_cap(int ioprio);
+
 #endif
-- 
2.15.1


  reply	other threads:[~2018-05-08 17:42 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-08 17:41 [PATCH v3 0/3] AIO add per-command iopriority adam.manzanares
2018-05-08 17:42 ` adam.manzanares [this message]
2018-05-08 17:42 ` [PATCH v3 2/3] fs: Convert kiocb rw_hint from enum to u16 adam.manzanares
2018-05-09 13:34   ` Theodore Y. Ts'o
2018-05-09 14:23     ` Jens Axboe
2018-05-09 15:21       ` Theodore Y. Ts'o
2018-05-09 15:29         ` Adam Manzanares
2018-05-08 17:42 ` [PATCH v3 3/3] fs: Add aio iopriority support for block_dev adam.manzanares
2018-05-09  8:54   ` kbuild test robot

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