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Commit aa434577 authored by Adam Manzanares's avatar Adam Manzanares Committed by Al Viro
Browse files

block: add ioprio_check_cap function 



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
privileges 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: default avatarAdam Manzanares <adam.manzanares@wdc.com>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarJeff Moyer <jmoyer@redhat.com>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent 1da92779

block/ioprio.c

+16 −6
Original line number Diff line number Diff line
@@ -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) {

include/linux/ioprio.h

+2 −0
Original line number Diff line number Diff line
@@ -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