diff options
| author | Christoph Hellwig <hch@lst.de> | 2021-12-09 07:31:27 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-12-16 10:59:01 -0700 |
| commit | a411cd3cfdc5bbd1329d5b33dbf39e2b5213969d (patch) | |
| tree | 19551602102daac1d756a057a77a5ffc9d685574 /block/blk-ioc.c | |
| parent | 091abcb3efd71cb18e80c8f040d9e4a634d8906d (diff) | |
| download | linux-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.c | 34 |
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; |