Do not call drivers when invalidating partitions for -ENOMEDIUM
This commit is contained in:
Dave Jones
parent
c10e53789b
commit
43a44e9595
15
kernel.spec
15
kernel.spec
@ -762,18 +762,19 @@ Patch21234: Bluetooth-Remove-bogus-inline-decl-from-l2cap_chan_connect.patch
|
|||||||
|
|
||||||
#rhbz 754518
|
#rhbz 754518
|
||||||
Patch21235: scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
|
Patch21235: scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
|
||||||
|
Patch21236: scsi-fix-sd_revalidate_disk-oops.patch
|
||||||
|
|
||||||
#rhbz 714828
|
#rhbz 714828
|
||||||
Patch21236: autofs4-lockdep.patch
|
Patch21240: autofs4-lockdep.patch
|
||||||
|
|
||||||
Patch21237: mcelog-rcu-splat.patch
|
Patch21250: mcelog-rcu-splat.patch
|
||||||
Patch21238: x86-Avoid-invoking-RCU-when-CPU-is-idle.patch
|
Patch21260: x86-Avoid-invoking-RCU-when-CPU-is-idle.patch
|
||||||
|
|
||||||
#rhbz 790367
|
#rhbz 790367
|
||||||
Patch21239: s390x-enable-keys-compat.patch
|
Patch21270: s390x-enable-keys-compat.patch
|
||||||
|
|
||||||
#rhbz 795544
|
#rhbz 795544
|
||||||
Patch21240: ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch
|
Patch21280: ums_realtek-do-not-use-stack-memory-for-DMA-in-__do_.patch
|
||||||
|
|
||||||
# compat-wireless patches
|
# compat-wireless patches
|
||||||
Patch50000: compat-wireless-config-fixups.patch
|
Patch50000: compat-wireless-config-fixups.patch
|
||||||
@ -1485,6 +1486,7 @@ ApplyPatch Bluetooth-Remove-bogus-inline-decl-from-l2cap_chan_connect.patch
|
|||||||
|
|
||||||
#rhbz 754518
|
#rhbz 754518
|
||||||
ApplyPatch scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
|
ApplyPatch scsi-sd_revalidate_disk-prevent-NULL-ptr-deref.patch
|
||||||
|
ApplyPatch scsi-fix-sd_revalidate_disk-oops.patch
|
||||||
|
|
||||||
#rhbz 714828
|
#rhbz 714828
|
||||||
ApplyPatch autofs4-lockdep.patch
|
ApplyPatch autofs4-lockdep.patch
|
||||||
@ -2376,6 +2378,9 @@ fi
|
|||||||
# ||----w |
|
# ||----w |
|
||||||
# || ||
|
# || ||
|
||||||
%changelog
|
%changelog
|
||||||
|
* Mon Feb 20 2012 Dave Jones <davej@redhat.com>
|
||||||
|
- Do not call drivers when invalidating partitions for -ENOMEDIUM
|
||||||
|
|
||||||
* Mon Feb 20 2012 Josh Boyer <jwboyer@redhat.com>
|
* Mon Feb 20 2012 Josh Boyer <jwboyer@redhat.com>
|
||||||
- Avoid using stack variables in ums_realtek (again) (rhbz 795544)
|
- Avoid using stack variables in ums_realtek (again) (rhbz 795544)
|
||||||
|
|
||||||
|
|||||||
187
scsi-fix-sd_revalidate_disk-oops.patch
Normal file
187
scsi-fix-sd_revalidate_disk-oops.patch
Normal file
@ -0,0 +1,187 @@
|
|||||||
|
Hi,
|
||||||
|
|
||||||
|
Thank you for review and comments.
|
||||||
|
|
||||||
|
On 02/16/12 02:26, Tejun Heo wrote:
|
||||||
|
> On Wed, Feb 15, 2012 at 11:56:19AM +0900, Jun'ichi Nomura wrote:
|
||||||
|
>> +int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
|
||||||
|
>> +{
|
||||||
|
>> + int res;
|
||||||
|
>> +
|
||||||
|
>> + res = drop_partitions(disk, bdev);
|
||||||
|
>> + if (res)
|
||||||
|
>> + return res;
|
||||||
|
>> +
|
||||||
|
>
|
||||||
|
> Hmmm... shouldn't we have set_capacity(disk, 0) here?
|
||||||
|
|
||||||
|
Added.
|
||||||
|
I wasn't sure whether I should leave it to drivers.
|
||||||
|
But it seems capacity 0 for ENOMEDIUM device is reasonable.
|
||||||
|
|
||||||
|
>> + check_disk_size_change(disk, bdev);
|
||||||
|
>> + bdev->bd_invalidated = 0;
|
||||||
|
>> + /* tell userspace that the media / partition table may have changed */
|
||||||
|
>> + kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
||||||
|
>
|
||||||
|
> Also, we really shouldn't be generating KOBJ_CHANGE after every
|
||||||
|
> -ENOMEDIUM open. This can easily lead to infinite loop. We should
|
||||||
|
> generate this iff we actually dropped partitions && modified the size.
|
||||||
|
|
||||||
|
invalidate_partitions() is called only when bd_invalidated is set.
|
||||||
|
So KOBJ_CHANGE is not raised for every ENOMEDIUM open.
|
||||||
|
|
||||||
|
I put it explicit in the function to make it safer for
|
||||||
|
possible misuse.
|
||||||
|
|
||||||
|
How about this?
|
||||||
|
|
||||||
|
---------------------------------------------------------
|
||||||
|
Do not call drivers when invalidating partitions for -ENOMEDIUM
|
||||||
|
|
||||||
|
When a scsi driver returns -ENOMEDIUM for open(),
|
||||||
|
__blkdev_get() calls rescan_partitions(), which ends up calling
|
||||||
|
sd_revalidate_disk() without getting a refcount of scsi_device.
|
||||||
|
|
||||||
|
That could lead to oops like this:
|
||||||
|
|
||||||
|
process A process B
|
||||||
|
----------------------------------------------
|
||||||
|
sys_open
|
||||||
|
__blkdev_get
|
||||||
|
sd_open
|
||||||
|
returns -ENOMEDIUM
|
||||||
|
scsi_remove_device
|
||||||
|
<scsi_device torn down>
|
||||||
|
rescan_partitions
|
||||||
|
sd_revalidate_disk
|
||||||
|
<oops>
|
||||||
|
|
||||||
|
Oopses are reported here:
|
||||||
|
http://marc.info/?l=linux-scsi&m=132388619710052
|
||||||
|
|
||||||
|
This patch separates the partition invalidation from rescan_partitions()
|
||||||
|
and use it for -ENOMEDIUM case.
|
||||||
|
|
||||||
|
Index: linux-3.3/block/partition-generic.c
|
||||||
|
===================================================================
|
||||||
|
--- linux-3.3.orig/block/partition-generic.c 2012-02-15 09:00:25.147293790 +0900
|
||||||
|
+++ linux-3.3/block/partition-generic.c 2012-02-16 10:48:22.257680685 +0900
|
||||||
|
@@ -389,17 +389,11 @@ static bool disk_unlock_native_capacity(
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
-int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
|
||||||
|
+static int drop_partitions(struct gendisk *disk, struct block_device *bdev)
|
||||||
|
{
|
||||||
|
- struct parsed_partitions *state = NULL;
|
||||||
|
struct disk_part_iter piter;
|
||||||
|
struct hd_struct *part;
|
||||||
|
- int p, highest, res;
|
||||||
|
-rescan:
|
||||||
|
- if (state && !IS_ERR(state)) {
|
||||||
|
- kfree(state);
|
||||||
|
- state = NULL;
|
||||||
|
- }
|
||||||
|
+ int res;
|
||||||
|
|
||||||
|
if (bdev->bd_part_count)
|
||||||
|
return -EBUSY;
|
||||||
|
@@ -412,6 +406,24 @@ rescan:
|
||||||
|
delete_partition(disk, part->partno);
|
||||||
|
disk_part_iter_exit(&piter);
|
||||||
|
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
+int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
|
||||||
|
+{
|
||||||
|
+ struct parsed_partitions *state = NULL;
|
||||||
|
+ struct hd_struct *part;
|
||||||
|
+ int p, highest, res;
|
||||||
|
+rescan:
|
||||||
|
+ if (state && !IS_ERR(state)) {
|
||||||
|
+ kfree(state);
|
||||||
|
+ state = NULL;
|
||||||
|
+ }
|
||||||
|
+
|
||||||
|
+ res = drop_partitions(disk, bdev);
|
||||||
|
+ if (res)
|
||||||
|
+ return res;
|
||||||
|
+
|
||||||
|
if (disk->fops->revalidate_disk)
|
||||||
|
disk->fops->revalidate_disk(disk);
|
||||||
|
check_disk_size_change(disk, bdev);
|
||||||
|
@@ -515,6 +527,26 @@ rescan:
|
||||||
|
return 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
+int invalidate_partitions(struct gendisk *disk, struct block_device *bdev)
|
||||||
|
+{
|
||||||
|
+ int res;
|
||||||
|
+
|
||||||
|
+ if (!bdev->bd_invalidated)
|
||||||
|
+ return 0;
|
||||||
|
+
|
||||||
|
+ res = drop_partitions(disk, bdev);
|
||||||
|
+ if (res)
|
||||||
|
+ return res;
|
||||||
|
+
|
||||||
|
+ set_capacity(disk, 0);
|
||||||
|
+ check_disk_size_change(disk, bdev);
|
||||||
|
+ bdev->bd_invalidated = 0;
|
||||||
|
+ /* tell userspace that the media / partition table may have changed */
|
||||||
|
+ kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
|
||||||
|
+
|
||||||
|
+ return 0;
|
||||||
|
+}
|
||||||
|
+
|
||||||
|
unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
|
||||||
|
{
|
||||||
|
struct address_space *mapping = bdev->bd_inode->i_mapping;
|
||||||
|
Index: linux-3.3/include/linux/genhd.h
|
||||||
|
===================================================================
|
||||||
|
--- linux-3.3.orig/include/linux/genhd.h 2012-02-09 12:21:53.000000000 +0900
|
||||||
|
+++ linux-3.3/include/linux/genhd.h 2012-02-16 10:47:43.783681813 +0900
|
||||||
|
@@ -596,6 +596,7 @@ extern char *disk_name (struct gendisk *
|
||||||
|
|
||||||
|
extern int disk_expand_part_tbl(struct gendisk *disk, int target);
|
||||||
|
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
|
||||||
|
+extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
|
||||||
|
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
|
||||||
|
int partno, sector_t start,
|
||||||
|
sector_t len, int flags,
|
||||||
|
Index: linux-3.3/fs/block_dev.c
|
||||||
|
===================================================================
|
||||||
|
--- linux-3.3.orig/fs/block_dev.c 2012-02-09 12:21:53.000000000 +0900
|
||||||
|
+++ linux-3.3/fs/block_dev.c 2012-02-16 10:47:52.602681441 +0900
|
||||||
|
@@ -1183,8 +1183,12 @@ static int __blkdev_get(struct block_dev
|
||||||
|
* The latter is necessary to prevent ghost
|
||||||
|
* partitions on a removed medium.
|
||||||
|
*/
|
||||||
|
- if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
|
||||||
|
- rescan_partitions(disk, bdev);
|
||||||
|
+ if (bdev->bd_invalidated) {
|
||||||
|
+ if (!ret)
|
||||||
|
+ rescan_partitions(disk, bdev);
|
||||||
|
+ else if (ret == -ENOMEDIUM)
|
||||||
|
+ invalidate_partitions(disk, bdev);
|
||||||
|
+ }
|
||||||
|
if (ret)
|
||||||
|
goto out_clear;
|
||||||
|
} else {
|
||||||
|
@@ -1214,8 +1218,12 @@ static int __blkdev_get(struct block_dev
|
||||||
|
if (bdev->bd_disk->fops->open)
|
||||||
|
ret = bdev->bd_disk->fops->open(bdev, mode);
|
||||||
|
/* the same as first opener case, read comment there */
|
||||||
|
- if (bdev->bd_invalidated && (!ret || ret == -ENOMEDIUM))
|
||||||
|
- rescan_partitions(bdev->bd_disk, bdev);
|
||||||
|
+ if (bdev->bd_invalidated) {
|
||||||
|
+ if (!ret)
|
||||||
|
+ rescan_partitions(bdev->bd_disk, bdev);
|
||||||
|
+ else if (ret == -ENOMEDIUM)
|
||||||
|
+ invalidate_partitions(bdev->bd_disk, bdev);
|
||||||
|
+ }
|
||||||
|
if (ret)
|
||||||
|
goto out_unlock_bdev;
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user