mirror of
https://github.com/torvalds/linux
synced 2024-09-06 18:01:05 +00:00
blk-iocost: Pass gendisk to ioc_refresh_params
Current kernel (d2980d8d82
) crashes when blk_iocost_init for `nvme1` disk. BUG: kernel NULL pointer dereference, address: 0000000000000050 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page blk_iocost_init (include/asm-generic/qspinlock.h:128 include/linux/spinlock.h:203 include/linux/spinlock_api_smp.h:158 include/linux/spinlock.h:400 block/blk-iocost.c:2884) ioc_qos_write (block/blk-iocost.c:3198) ? kretprobe_perf_func (kernel/trace/trace_kprobe.c:1566) ? kernfs_fop_write_iter (include/linux/slab.h:584 fs/kernfs/file.c:311) ? __kmem_cache_alloc_node (mm/slab.h:? mm/slub.c:3452 mm/slub.c:3491) ? _copy_from_iter (arch/x86/include/asm/uaccess_64.h:46 arch/x86/include/asm/uaccess_64.h:52 lib/iov_iter.c:183 lib/iov_iter.c:628) ? kretprobe_dispatcher (kernel/trace/trace_kprobe.c:1693) cgroup_file_write (kernel/cgroup/cgroup.c:4061) kernfs_fop_write_iter (fs/kernfs/file.c:334) vfs_write (include/linux/fs.h:1849 fs/read_write.c:491 fs/read_write.c:584) ksys_write (fs/read_write.c:637) do_syscall_64 (arch/x86/entry/common.c:50 arch/x86/entry/common.c:80) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:120) This happens because ioc_refresh_params() is being called without a properly initialized ioc->rqos, which is happening later in the callee side. ioc_refresh_params() -> ioc_autop_idx() tries to access ioc->rqos.disk->queue but ioc->rqos.disk is NULL, causing the BUG above. Create function, called ioc_refresh_params_disk(), that is similar to ioc_refresh_params() but where the "struct gendisk" could be passed as an explicit argument. This function will be called when ioc->rqos.disk is not initialized. Fixes:ce57b55860
("blk-rq-qos: make rq_qos_add and rq_qos_del more useful") Signed-off-by: Breno Leitao <leitao@debian.org> Acked-by: Tejun Heo <tj@kernel.org> Link: https://lore.kernel.org/r/20230228111654.1778120-1-leitao@debian.org Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
parent
310726c33a
commit
e33b93650f
|
@ -800,7 +800,11 @@ static void ioc_refresh_period_us(struct ioc *ioc)
|
||||||
ioc_refresh_margins(ioc);
|
ioc_refresh_margins(ioc);
|
||||||
}
|
}
|
||||||
|
|
||||||
static int ioc_autop_idx(struct ioc *ioc)
|
/*
|
||||||
|
* ioc->rqos.disk isn't initialized when this function is called from
|
||||||
|
* the init path.
|
||||||
|
*/
|
||||||
|
static int ioc_autop_idx(struct ioc *ioc, struct gendisk *disk)
|
||||||
{
|
{
|
||||||
int idx = ioc->autop_idx;
|
int idx = ioc->autop_idx;
|
||||||
const struct ioc_params *p = &autop[idx];
|
const struct ioc_params *p = &autop[idx];
|
||||||
|
@ -808,11 +812,11 @@ static int ioc_autop_idx(struct ioc *ioc)
|
||||||
u64 now_ns;
|
u64 now_ns;
|
||||||
|
|
||||||
/* rotational? */
|
/* rotational? */
|
||||||
if (!blk_queue_nonrot(ioc->rqos.disk->queue))
|
if (!blk_queue_nonrot(disk->queue))
|
||||||
return AUTOP_HDD;
|
return AUTOP_HDD;
|
||||||
|
|
||||||
/* handle SATA SSDs w/ broken NCQ */
|
/* handle SATA SSDs w/ broken NCQ */
|
||||||
if (blk_queue_depth(ioc->rqos.disk->queue) == 1)
|
if (blk_queue_depth(disk->queue) == 1)
|
||||||
return AUTOP_SSD_QD1;
|
return AUTOP_SSD_QD1;
|
||||||
|
|
||||||
/* use one of the normal ssd sets */
|
/* use one of the normal ssd sets */
|
||||||
|
@ -901,14 +905,19 @@ static void ioc_refresh_lcoefs(struct ioc *ioc)
|
||||||
&c[LCOEF_WPAGE], &c[LCOEF_WSEQIO], &c[LCOEF_WRANDIO]);
|
&c[LCOEF_WPAGE], &c[LCOEF_WSEQIO], &c[LCOEF_WRANDIO]);
|
||||||
}
|
}
|
||||||
|
|
||||||
static bool ioc_refresh_params(struct ioc *ioc, bool force)
|
/*
|
||||||
|
* struct gendisk is required as an argument because ioc->rqos.disk
|
||||||
|
* is not properly initialized when called from the init path.
|
||||||
|
*/
|
||||||
|
static bool ioc_refresh_params_disk(struct ioc *ioc, bool force,
|
||||||
|
struct gendisk *disk)
|
||||||
{
|
{
|
||||||
const struct ioc_params *p;
|
const struct ioc_params *p;
|
||||||
int idx;
|
int idx;
|
||||||
|
|
||||||
lockdep_assert_held(&ioc->lock);
|
lockdep_assert_held(&ioc->lock);
|
||||||
|
|
||||||
idx = ioc_autop_idx(ioc);
|
idx = ioc_autop_idx(ioc, disk);
|
||||||
p = &autop[idx];
|
p = &autop[idx];
|
||||||
|
|
||||||
if (idx == ioc->autop_idx && !force)
|
if (idx == ioc->autop_idx && !force)
|
||||||
|
@ -939,6 +948,11 @@ static bool ioc_refresh_params(struct ioc *ioc, bool force)
|
||||||
return true;
|
return true;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static bool ioc_refresh_params(struct ioc *ioc, bool force)
|
||||||
|
{
|
||||||
|
return ioc_refresh_params_disk(ioc, force, ioc->rqos.disk);
|
||||||
|
}
|
||||||
|
|
||||||
/*
|
/*
|
||||||
* When an iocg accumulates too much vtime or gets deactivated, we throw away
|
* When an iocg accumulates too much vtime or gets deactivated, we throw away
|
||||||
* some vtime, which lowers the overall device utilization. As the exact amount
|
* some vtime, which lowers the overall device utilization. As the exact amount
|
||||||
|
@ -2880,7 +2894,7 @@ static int blk_iocost_init(struct gendisk *disk)
|
||||||
|
|
||||||
spin_lock_irq(&ioc->lock);
|
spin_lock_irq(&ioc->lock);
|
||||||
ioc->autop_idx = AUTOP_INVALID;
|
ioc->autop_idx = AUTOP_INVALID;
|
||||||
ioc_refresh_params(ioc, true);
|
ioc_refresh_params_disk(ioc, true, disk);
|
||||||
spin_unlock_irq(&ioc->lock);
|
spin_unlock_irq(&ioc->lock);
|
||||||
|
|
||||||
/*
|
/*
|
||||||
|
|
Loading…
Reference in a new issue