bf23747ee0
The kernel test robot is reporting that xfstest which does
umount ext2 on xfs
umount xfs
sequence started failing, for commit 322c4293ec ("loop: make
autoclear operation asynchronous") removed a guarantee that fput() of
backing file is processed before lo_release() from close() returns to
user mode.
And syzbot is reporting that deferring destroy_workqueue() from
__loop_clr_fd() to a WQ context did not help [1]. Revert that commit.
Link: https://syzkaller.appspot.com/bug?extid=831661966588c802aae9 [1]
Reported-by: kernel test robot <oliver.sang@intel.com>
Acked-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reported-by: syzbot <syzbot+831661966588c802aae9@syzkaller.appspotmail.com>
Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Link: https://lore.kernel.org/r/20220211071554.3424-1-penguin-kernel@I-love.SAKURA.ne.jp
Signed-off-by: Jens Axboe <axboe@kernel.dk>
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
/*
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* loop.h
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*
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* Written by Theodore Ts'o, 3/29/93.
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*
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* Copyright 1993 by Theodore Ts'o. Redistribution of this file is
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* permitted under the GNU General Public License.
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*/
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#ifndef _LINUX_LOOP_H
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#define _LINUX_LOOP_H
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#include <linux/bio.h>
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#include <linux/blkdev.h>
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#include <linux/blk-mq.h>
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#include <linux/spinlock.h>
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#include <linux/mutex.h>
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#include <uapi/linux/loop.h>
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/* Possible states of device */
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enum {
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Lo_unbound,
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Lo_bound,
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Lo_rundown,
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Lo_deleting,
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};
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struct loop_func_table;
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struct loop_device {
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int lo_number;
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atomic_t lo_refcnt;
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loff_t lo_offset;
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loff_t lo_sizelimit;
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int lo_flags;
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char lo_file_name[LO_NAME_SIZE];
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struct file * lo_backing_file;
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struct block_device *lo_device;
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gfp_t old_gfp_mask;
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spinlock_t lo_lock;
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int lo_state;
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spinlock_t lo_work_lock;
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struct workqueue_struct *workqueue;
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struct work_struct rootcg_work;
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struct list_head rootcg_cmd_list;
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struct list_head idle_worker_list;
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struct rb_root worker_tree;
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struct timer_list timer;
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bool use_dio;
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bool sysfs_inited;
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struct request_queue *lo_queue;
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struct blk_mq_tag_set tag_set;
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struct gendisk *lo_disk;
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struct mutex lo_mutex;
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bool idr_visible;
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};
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struct loop_cmd {
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struct list_head list_entry;
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bool use_aio; /* use AIO interface to handle I/O */
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atomic_t ref; /* only for aio */
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long ret;
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struct kiocb iocb;
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struct bio_vec *bvec;
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struct cgroup_subsys_state *blkcg_css;
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struct cgroup_subsys_state *memcg_css;
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};
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#endif
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