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authorChristoph Hellwig <hch@lst.de>2021-12-09 07:31:27 +0100
committerJens Axboe <axboe@kernel.dk>2021-12-16 10:59:01 -0700
commita411cd3cfdc5bbd1329d5b33dbf39e2b5213969d (patch)
tree19551602102daac1d756a057a77a5ffc9d685574 /block/blk-ioc.c
parent091abcb3efd71cb18e80c8f040d9e4a634d8906d (diff)
downloadlinux-a411cd3cfdc5bbd1329d5b33dbf39e2b5213969d.tar.gz
block: move set_task_ioprio to blk-ioc.c
Keep set_task_ioprio with the other low-level code that accesses the io_context structure. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20211209063131.18537-8-hch@lst.de Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/blk-ioc.c')
-rw-r--r--block/blk-ioc.c34
1 files changed, 32 insertions, 2 deletions
diff --git a/block/blk-ioc.c b/block/blk-ioc.c
index f98a29ee8f36..c25ce2f3eb19 100644
--- a/block/blk-ioc.c
+++ b/block/blk-ioc.c
@@ -8,6 +8,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/slab.h>
+#include <linux/security.h>
#include <linux/sched/task.h>
#include "blk.h"
@@ -280,8 +281,8 @@ static struct io_context *create_task_io_context(struct task_struct *task,
* This function always goes through task_lock() and it's better to use
* %current->io_context + get_io_context() for %current.
*/
-struct io_context *get_task_io_context(struct task_struct *task,
- gfp_t gfp_flags, int node)
+static struct io_context *get_task_io_context(struct task_struct *task,
+ gfp_t gfp_flags, int node)
{
struct io_context *ioc;
@@ -298,6 +299,35 @@ struct io_context *get_task_io_context(struct task_struct *task,
return ioc;
}
+int set_task_ioprio(struct task_struct *task, int ioprio)
+{
+ int err;
+ struct io_context *ioc;
+ const struct cred *cred = current_cred(), *tcred;
+
+ rcu_read_lock();
+ tcred = __task_cred(task);
+ if (!uid_eq(tcred->uid, cred->euid) &&
+ !uid_eq(tcred->uid, cred->uid) && !capable(CAP_SYS_NICE)) {
+ rcu_read_unlock();
+ return -EPERM;
+ }
+ rcu_read_unlock();
+
+ err = security_task_setioprio(task, ioprio);
+ if (err)
+ return err;
+
+ ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE);
+ if (ioc) {
+ ioc->ioprio = ioprio;
+ put_io_context(ioc);
+ }
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(set_task_ioprio);
+
int __copy_io(unsigned long clone_flags, struct task_struct *tsk)
{
struct io_context *ioc = current->io_context;