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fs: Add aio iopriority support

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This is the per-I/O equivalent of the ioprio_set system call.

When IOCB_FLAG_IOPRIO is set on the iocb aio_flags field, then we set the
newly added kiocb ki_ioprio field to the value in the iocb aio_reqprio field.

This patch depends on block: add ioprio_check_cap function.

Signed-off-by: Adam Manzanares <adam.manzanares@wdc.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Adam Manzanares 2018-05-22 10:52:19 -07:00 committed by Al Viro
parent fc28724d67
commit d9a08a9e61
4 changed files with 23 additions and 0 deletions
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3
drivers/block/loop.c
View file

@ -76,6 +76,8 @@
#include <linux/miscdevice.h>
#include <linux/falloc.h>
#include <linux/uio.h>
#include <linux/ioprio.h>
#include "loop.h"
#include <linux/uaccess.h>
@ -559,6 +561,7 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd,
cmd->iocb.ki_filp = file;
cmd->iocb.ki_complete = lo_rw_aio_complete;
cmd->iocb.ki_flags = IOCB_DIRECT;
cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
if (cmd->css)
kthread_associate_blkcg(cmd->css);

16
fs/aio.c
View file

@ -1435,6 +1435,22 @@ static int aio_prep_rw(struct kiocb *req, struct iocb *iocb)
if (iocb->aio_flags & IOCB_FLAG_RESFD)
req->ki_flags |= IOCB_EVENTFD;
req->ki_hint = ki_hint_validate(file_write_hint(req->ki_filp));
if (iocb->aio_flags & IOCB_FLAG_IOPRIO) {
/*
* If the IOCB_FLAG_IOPRIO flag of aio_flags is set, then
* aio_reqprio is interpreted as an I/O scheduling
* class and priority.
*/
ret = ioprio_check_cap(iocb->aio_reqprio);
if (ret) {
pr_debug("aio ioprio check cap error\n");
return -EINVAL;
}
req->ki_ioprio = iocb->aio_reqprio;
} else
req->ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0);
ret = kiocb_set_rw_flags(req, iocb->aio_rw_flags);
if (unlikely(ret))
fput(req->ki_filp);

3
include/linux/fs.h
View file

@ -36,6 +36,7 @@
#include <linux/delayed_call.h>
#include <linux/uuid.h>
#include <linux/errseq.h>
#include <linux/ioprio.h>
#include <asm/byteorder.h>
#include <uapi/linux/fs.h>
@ -300,6 +301,7 @@ struct kiocb {
void *private;
int ki_flags;
u16 ki_hint;
u16 ki_ioprio; /* See linux/ioprio.h */
} __randomize_layout;
static inline bool is_sync_kiocb(struct kiocb *kiocb)
@ -1944,6 +1946,7 @@ static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
.ki_filp = filp,
.ki_flags = iocb_flags(filp),
.ki_hint = ki_hint_validate(file_write_hint(filp)),
.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0),
};
}

1
include/uapi/linux/aio_abi.h
View file

@ -53,6 +53,7 @@ enum {
* is valid.
*/
#define IOCB_FLAG_RESFD (1 << 0)
#define IOCB_FLAG_IOPRIO (1 << 1)
/* read() from /dev/aio returns these structures. */
struct io_event {