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2023-06-12fs: remove the now unused FMODE_* flagsChristoph Hellwig1-7/+0
FMODE_NDELAY, FMODE_EXCL and FMODE_WRITE_IOCTL were only used for block internal purposed and are now entirely unused, so remove them. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Reviewed-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: store the holder in file->private_dataChristoph Hellwig1-6/+8
Store the file struct used as the holder in file->private_data as an indicator that this file descriptor was opened exclusively to remove the last use of FMODE_EXCL. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: always use I_BDEV on file->f_mapping->host to find the bdevChristoph Hellwig1-10/+8
Always use I_BDEV(file->f_mapping->host) to find the bdev for a file to free up file->private_data for other uses. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: replace fmode_t with a block-specific type for block open flagsChristoph Hellwig82-315/+334
The only overlap between the block open flags mapped into the fmode_t and other uses of fmode_t are FMODE_READ and FMODE_WRITE. Define a new blk_mode_t instead for use in blkdev_get_by_{dev,path}, ->open and ->ioctl and stop abusing fmode_t. Signed-off-by: Christoph Hellwig <[email protected]> Acked-by: Jack Wang <[email protected]> [rnbd] Reviewed-by: Hannes Reinecke <[email protected]> Reviewed-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: remove unused fmode_t arguments from ioctl handlersChristoph Hellwig3-12/+12
A few ioctl handlers have fmode_t arguments that are entirely unused, remove them. Signed-off-by: Christoph Hellwig <[email protected]> Acked-by: Christian Brauner <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: move a few internal definitions out of blkdev.hChristoph Hellwig2-29/+21
All these helpers are only used in core block code, so move them out of the public header. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12ubd: remove commented out code in ubd_openChristoph Hellwig1-7/+0
This code has been dead forever, make sure it doesn't show up in code searches. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: Richard Weinberger <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12rnbd-srv: replace sess->open_flags with a "bool readonly"Christoph Hellwig3-11/+9
Stop passing the fmode_t around and just use a simple bool to track if an export is read-only. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: Jack Wang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12mtd: block: use a simple bool to track open for writeChristoph Hellwig3-3/+3
Instead of propagating the fmode_t, just use a bool to track if a mtd block device was opened for writing. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: Richard Weinberger <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12nvme: replace the fmode_t argument to the nvme ioctl handlers with a simple boolChristoph Hellwig1-28/+34
Instead of passing a fmode_t and only checking it fo0r FMODE_WRITE, pass a bool open_for_write to prepare for callers that won't have the fmode_t. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Reviewed-by: Keith Busch <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12scsi: replace the fmode_t argument to ->sg_io_fn with a simple boolChristoph Hellwig4-7/+9
Instead of passing a fmode_t and only checking it for FMODE_WRITE, pass a bool open_for_write to prepare for callers that won't have the fmode_t. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Martin K. Petersen <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12scsi: replace the fmode_t argument to scsi_ioctl with a simple boolChristoph Hellwig7-24/+26
Instead of passing a fmode_t and only checking it for FMODE_WRITE, pass a bool open_for_write to prepare for callers that won't have the fmode_t. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Martin K. Petersen <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12scsi: replace the fmode_t argument to scsi_cmd_allowed with a simple boolChristoph Hellwig4-7/+7
Instead of passing a fmode_t and only checking it for FMODE_WRITE, pass a bool open_for_write to prepare for callers that won't have the fmode_t. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Martin K. Petersen <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12fs: remove sb->s_modeChristoph Hellwig4-8/+6
There is no real need to store the open mode in the super_block now. It is only used by f2fs, which can easily recalculate it. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: add a sb_open_mode helperChristoph Hellwig4-20/+14
Add a helper to return the open flags for blkdev_get_by* for passed in super block flags instead of open coding the logic in many places. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: use the holder as indication for exclusive opensChristoph Hellwig37-192/+183
The current interface for exclusive opens is rather confusing as it requires both the FMODE_EXCL flag and a holder. Remove the need to pass FMODE_EXCL and just key off the exclusive open off a non-NULL holder. For blkdev_put this requires adding the holder argument, which provides better debug checking that only the holder actually releases the hold, but at the same time allows removing the now superfluous mode argument. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: David Sterba <[email protected]> [btrfs] Acked-by: Jack Wang <[email protected]> [rnbd] Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12btrfs: don't pass a holder for non-exclusive blkdev_get_by_pathChristoph Hellwig3-21/+15
Passing a holder to blkdev_get_by_path when FMODE_EXCL isn't set doesn't make sense, so pass NULL instead and remove the holder argument from the call chains the only end up in non-FMODE_EXCL blkdev_get_by_path calls. Exclusive mode for device scanning is not used since commit 50d281fc434c ("btrfs: scan device in non-exclusive mode")". Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: David Sterba <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12rnbd-srv: don't pass a holder for non-exclusive blkdev_get_by_pathChristoph Hellwig1-1/+1
Passing a holder to blkdev_get_by_path when FMODE_EXCL isn't set doesn't make sense, so pass NULL instead. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: Jack Wang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12bcache: don't pass a stack address to blkdev_get_by_pathChristoph Hellwig1-1/+1
sb is just an on-stack pointer that can easily be reused by other calls. Switch to use the bcache-wide bcache_kobj instead as there is no need to claim per-bcache device anyway. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12swsusp: don't pass a stack address to blkdev_get_by_pathChristoph Hellwig1-2/+3
holder is just an on-stack pointer that can easily be reused by other calls, replace it with a static variable that doesn't change. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Rafael J. Wysocki <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: rename blkdev_close to blkdev_releaseChristoph Hellwig1-2/+2
Make the function name match the method name. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: remove the unused mode argument to ->releaseChristoph Hellwig30-43/+41
The mode argument to the ->release block_device_operation is never used, so remove it. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: Jack Wang <[email protected]> [rnbd] Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: pass a gendisk to ->openChristoph Hellwig31-107/+102
->open is only called on the whole device. Make that explicit by passing a gendisk instead of the block_device. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Acked-by: Jack Wang <[email protected]> [rnbd] Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: pass a gendisk on bdev_check_media_changeChristoph Hellwig11-32/+31
bdev_check_media_change should only ever be called for the whole device. Pass a gendisk to make that explicit and rename the function to disk_check_media_change. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12cdrom: remove the unused mode argument to cdrom_releaseChristoph Hellwig4-4/+4
Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Phillip Potter <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12cdrom: track if a cdrom_device_info was opened for dataChristoph Hellwig2-7/+6
Set a flag when a cdrom_device_info is opened for writing, instead of trying to figure out this at release time. This will allow to eventually remove the mode argument to the ->release block_device_operation as nothing but the CDROM drivers uses that argument. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Phillip Potter <[email protected]> Acked-by: Christian Brauner <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12cdrom: remove the unused cdrom_close_write release codeChristoph Hellwig2-16/+0
cdrom_close_write is empty, and the for_data flag it is keyed off is never set. Remove all this clutter. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Phillip Potter <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12cdrom: remove the unused mode argument to cdrom_ioctlChristoph Hellwig4-5/+5
Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Phillip Potter <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12cdrom: remove the unused bdev argument to cdrom_openChristoph Hellwig4-6/+4
Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Phillip Potter <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-12block: also call ->open for incremental partition opensChristoph Hellwig1-10/+8
For whole devices ->open is called for each open, but for partitions it is only called on the first open of a partition, e.g.: open("/dev/vdb", ...) open("/dev/vdb", ...) - 2 call to ->open open("/dev/vdb1", ...) open("/dev/vdb", ...) - 2 call to ->open open("/dev/vdb", ...) open("/dev/vdb", ...) - just open call to ->open This is problematic as various block drivers look at open flags and might not do all the required setup if the earlier open was with an odd flag like O_NDELAY or the magic 3 ioctl-only open mode. Signed-off-by: Christoph Hellwig <[email protected]> Reviewed-by: Phillip Potter <[email protected]> Reviewed-by: Hannes Reinecke <[email protected]> Acked-by: Christian Brauner <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd-srv: make process_msg_sess_info returns voidGuoqing Jiang1-6/+3
Change the return type to void given it always returns 0. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd-srv: init err earlier in rnbd_srv_init_moduleGuoqing Jiang1-5/+3
With this, we can remove several lines of code. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd-srv: init ret with 0 instead of -EPERMGuoqing Jiang1-4/+3
Let's always set errno after pr_err which is consistent with default case. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd-srv: rename one member in rnbd_srv_devGuoqing Jiang2-8/+8
It actually represents the name of rnbd_srv_dev. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd-srv: no need to check sess_devGuoqing Jiang1-1/+1
Check ret is enough since if sess_dev is NULL which also implies ret should be 0. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd: introduce rnbd_access_modesGuoqing Jiang6-32/+16
Add one new array (marked with __maybe_unused to prevent gcc warning about "defined but not used" with W=1), then we can remove rnbd_access_mode_str and rnbd-common.c accordingly. Signed-off-by: Guoqing Jiang <[email protected]> Acked-by: Jack Wang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd-srv: remove unused headerGuoqing Jiang1-1/+0
No need to include it since none of macros in limits.h are used by rnbd-srv. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-11block/rnbd: kill rnbd_flags_supportedGuoqing Jiang1-22/+0
This routine is not called since added. Then the two flags (RNBD_OP_LAST and RNBD_F_ALL) can be removed too after kill rnbd_flags_supported. Acked-by: Jack Wang <[email protected]> Signed-off-by: Guoqing Jiang <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-09block: fix rootwait= againChristoph Hellwig1-1/+1
The previous rootwait fix added an -EINVAL return to a completely bogus superflous branch, fix this. Fixes: 1341c7d2ccf4 ("block: fix rootwait=") Reported-by: Mark Brown <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Tested-by: Fabio Estevam <[email protected]> Tested-by: Marek Szyprowski <[email protected]> Tested-by: Mark Brown <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Sort headersAndy Shevchenko1-15/+16
Sort the headers in alphabetic order in order to ease the maintenance for this part. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Get rid of redundant 'else'Andy Shevchenko1-7/+7
In the snippets like the following if (...) return / goto / break / continue ...; else ... the 'else' is redundant. Get rid of it. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Use put_unaligned_be16() and get_unaligned_be16()Andy Shevchenko1-17/+14
This makes the driver code slightly better to understand. Signed-off-by: Andy Shevchenko <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Use DEFINE_SHOW_ATTRIBUTE() to simplify codeAndy Shevchenko1-20/+3
Use DEFINE_SHOW_ATTRIBUTE() helper macro to simplify the code. No functional change. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Drop redundant castings for sector_tAndy Shevchenko1-16/+10
Since the commit 72deb455b5ec ("block: remove CONFIG_LBDAF") the sector_t is always 64-bit type, no need to cast anymore. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Get rid of pkt_seq_show() forward declarationAndy Shevchenko1-76/+75
The code can be neater without forward declarations. Get rid of pkt_seq_show() forward declaration. This will also allow futher cleanups to be cleaner. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: use sysfs_emit() to instead of scnprintf()Andy Shevchenko1-1/+1
Follow the advice of the Documentation/filesystems/sysfs.rst and show() should only use sysfs_emit() or sysfs_emit_at() when formatting the value to be returned to user space. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: replace sscanf() by kstrtoul()Andy Shevchenko1-16/+18
The checkpatch.pl warns: "Prefer kstrto<type> to single variable sscanf". Fix the code accordingly. Signed-off-by: Andy Shevchenko <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07pktcdvd: Get rid of custom printing macrosAndy Shevchenko3-119/+130
We may use traditional dev_*() macros instead of custom ones provided by the driver. Signed-off-by: Andy Shevchenko <[email protected]> Reviewed-by: Greg Kroah-Hartman <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07block: fix rootwait=Christoph Hellwig1-2/+2
Failures to look up the gendisk must return -ENODEV so that rootwait retries the lookup instead of -EINVAL which exits early. Fixes: cf056a431215 ("init: improve the name_to_dev_t interface") Reported-by: Fabio Estevam <[email protected]> Signed-off-by: Christoph Hellwig <[email protected]> Tested-by: Fabio Estevam <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
2023-06-07blk-cgroup: Reinit blkg_iostat_set after clearing in blkcg_reset_stats()Waiman Long1-0/+5
When blkg_alloc() is called to allocate a blkcg_gq structure with the associated blkg_iostat_set's, there are 2 fields within blkg_iostat_set that requires proper initialization - blkg & sync. The former field was introduced by commit 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") while the later one was introduced by commit f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat"). Unfortunately those fields in the blkg_iostat_set's are not properly re-initialized when they are cleared in v1's blkcg_reset_stats(). This can lead to a kernel panic due to NULL pointer access of the blkg pointer. The missing initialization of sync is less problematic and can be a problem in a debug kernel due to missing lockdep initialization. Fix these problems by re-initializing them after memory clearing. Fixes: 3b8cc6298724 ("blk-cgroup: Optimize blkcg_rstat_flush()") Fixes: f73316482977 ("blk-cgroup: reimplement basic IO stats using cgroup rstat") Signed-off-by: Waiman Long <[email protected]> Reviewed-by: Ming Lei <[email protected]> Acked-by: Tejun Heo <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Jens Axboe <[email protected]>
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