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d71a0899e4
commit 7533afa1d2 upstream.
Device mapper sends an uevent when the device is suspended, using the
function set_capacity_and_notify. However, this causes a race condition
with udev.
Udev skips scanning dm devices that are suspended. If we send an uevent
while we are suspended, udev will be racing with device mapper resume
code. If the device mapper resume code wins the race, udev will process
the uevent after the device is resumed and it will properly scan the
device.
However, if udev wins the race, it will receive the uevent, find out that
the dm device is suspended and skip scanning the device. This causes bugs
such as systemd unmounting the device - see
https://bugzilla.redhat.com/show_bug.cgi?id=2158628
This commit fixes this race.
We replace the function set_capacity_and_notify with set_capacity, so that
the uevent is not sent at this point. In do_resume, we detect if the
capacity has changed and we pass a boolean variable need_resize_uevent to
dm_kobject_uevent. dm_kobject_uevent adds "RESIZE=1" to the uevent if
need_resize_uevent is set.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Tested-by: Peter Rajnoha <prajnoha@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
238 lines
7.2 KiB
C
238 lines
7.2 KiB
C
/*
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* Internal header file for device mapper
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*
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* Copyright (C) 2001, 2002 Sistina Software
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the LGPL.
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*/
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#ifndef DM_INTERNAL_H
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#define DM_INTERNAL_H
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#include <linux/fs.h>
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#include <linux/device-mapper.h>
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#include <linux/list.h>
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#include <linux/moduleparam.h>
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#include <linux/blkdev.h>
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#include <linux/backing-dev.h>
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#include <linux/hdreg.h>
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#include <linux/completion.h>
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#include <linux/kobject.h>
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#include <linux/refcount.h>
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#include "dm-stats.h"
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/*
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* Suspend feature flags
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*/
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#define DM_SUSPEND_LOCKFS_FLAG (1 << 0)
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#define DM_SUSPEND_NOFLUSH_FLAG (1 << 1)
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/*
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* Status feature flags
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*/
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#define DM_STATUS_NOFLUSH_FLAG (1 << 0)
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/*
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* List of devices that a metadevice uses and should open/close.
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*/
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struct dm_dev_internal {
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struct list_head list;
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refcount_t count;
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struct dm_dev *dm_dev;
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};
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struct dm_table;
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struct dm_md_mempools;
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struct dm_target_io;
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struct dm_io;
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/*-----------------------------------------------------------------
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* Internal table functions.
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*---------------------------------------------------------------*/
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void dm_table_event_callback(struct dm_table *t,
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void (*fn)(void *), void *context);
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struct dm_target *dm_table_get_target(struct dm_table *t, unsigned int index);
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struct dm_target *dm_table_find_target(struct dm_table *t, sector_t sector);
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bool dm_table_has_no_data_devices(struct dm_table *table);
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int dm_calculate_queue_limits(struct dm_table *table,
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struct queue_limits *limits);
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int dm_table_set_restrictions(struct dm_table *t, struct request_queue *q,
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struct queue_limits *limits);
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struct list_head *dm_table_get_devices(struct dm_table *t);
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void dm_table_presuspend_targets(struct dm_table *t);
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void dm_table_presuspend_undo_targets(struct dm_table *t);
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void dm_table_postsuspend_targets(struct dm_table *t);
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int dm_table_resume_targets(struct dm_table *t);
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enum dm_queue_mode dm_table_get_type(struct dm_table *t);
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struct target_type *dm_table_get_immutable_target_type(struct dm_table *t);
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struct dm_target *dm_table_get_immutable_target(struct dm_table *t);
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struct dm_target *dm_table_get_wildcard_target(struct dm_table *t);
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bool dm_table_bio_based(struct dm_table *t);
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bool dm_table_request_based(struct dm_table *t);
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void dm_table_free_md_mempools(struct dm_table *t);
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struct dm_md_mempools *dm_table_get_md_mempools(struct dm_table *t);
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bool dm_table_supports_dax(struct dm_table *t, iterate_devices_callout_fn fn,
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int *blocksize);
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int device_not_dax_capable(struct dm_target *ti, struct dm_dev *dev,
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sector_t start, sector_t len, void *data);
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void dm_lock_md_type(struct mapped_device *md);
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void dm_unlock_md_type(struct mapped_device *md);
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void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type);
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enum dm_queue_mode dm_get_md_type(struct mapped_device *md);
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struct target_type *dm_get_immutable_target_type(struct mapped_device *md);
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int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t);
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/*
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* To check whether the target type is bio-based or not (request-based).
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*/
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#define dm_target_bio_based(t) ((t)->type->map != NULL)
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/*
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* To check whether the target type is request-based or not (bio-based).
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*/
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#define dm_target_request_based(t) ((t)->type->clone_and_map_rq != NULL)
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/*
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* To check whether the target type is a hybrid (capable of being
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* either request-based or bio-based).
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*/
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#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
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/*
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* Zoned targets related functions.
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*/
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int dm_set_zones_restrictions(struct dm_table *t, struct request_queue *q);
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void dm_zone_endio(struct dm_io *io, struct bio *clone);
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#ifdef CONFIG_BLK_DEV_ZONED
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void dm_cleanup_zoned_dev(struct mapped_device *md);
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int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
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unsigned int nr_zones, report_zones_cb cb, void *data);
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bool dm_is_zone_write(struct mapped_device *md, struct bio *bio);
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int dm_zone_map_bio(struct dm_target_io *io);
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#else
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static inline void dm_cleanup_zoned_dev(struct mapped_device *md) {}
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#define dm_blk_report_zones NULL
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static inline bool dm_is_zone_write(struct mapped_device *md, struct bio *bio)
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{
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return false;
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}
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static inline int dm_zone_map_bio(struct dm_target_io *tio)
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{
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return DM_MAPIO_KILL;
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}
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#endif
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/*-----------------------------------------------------------------
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* A registry of target types.
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*---------------------------------------------------------------*/
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int dm_target_init(void);
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void dm_target_exit(void);
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struct target_type *dm_get_target_type(const char *name);
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void dm_put_target_type(struct target_type *tt);
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int dm_target_iterate(void (*iter_func)(struct target_type *tt,
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void *param), void *param);
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int dm_split_args(int *argc, char ***argvp, char *input);
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/*
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* Is this mapped_device being deleted?
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*/
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int dm_deleting_md(struct mapped_device *md);
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/*
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* Is this mapped_device suspended?
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*/
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int dm_suspended_md(struct mapped_device *md);
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/*
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* Internal suspend and resume methods.
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*/
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int dm_suspended_internally_md(struct mapped_device *md);
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void dm_internal_suspend_fast(struct mapped_device *md);
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void dm_internal_resume_fast(struct mapped_device *md);
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void dm_internal_suspend_noflush(struct mapped_device *md);
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void dm_internal_resume(struct mapped_device *md);
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/*
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* Test if the device is scheduled for deferred remove.
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*/
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int dm_test_deferred_remove_flag(struct mapped_device *md);
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/*
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* Try to remove devices marked for deferred removal.
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*/
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void dm_deferred_remove(void);
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/*
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* The device-mapper can be driven through one of two interfaces;
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* ioctl or filesystem, depending which patch you have applied.
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*/
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int dm_interface_init(void);
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void dm_interface_exit(void);
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/*
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* sysfs interface
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*/
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int dm_sysfs_init(struct mapped_device *md);
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void dm_sysfs_exit(struct mapped_device *md);
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struct kobject *dm_kobject(struct mapped_device *md);
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struct mapped_device *dm_get_from_kobject(struct kobject *kobj);
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/*
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* The kobject helper
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*/
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void dm_kobject_release(struct kobject *kobj);
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/*
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* Targets for linear and striped mappings
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*/
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int dm_linear_init(void);
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void dm_linear_exit(void);
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int dm_stripe_init(void);
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void dm_stripe_exit(void);
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/*
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* mapped_device operations
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*/
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void dm_destroy(struct mapped_device *md);
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void dm_destroy_immediate(struct mapped_device *md);
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int dm_open_count(struct mapped_device *md);
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int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred);
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int dm_cancel_deferred_remove(struct mapped_device *md);
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int dm_request_based(struct mapped_device *md);
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int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
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struct dm_dev **result);
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void dm_put_table_device(struct mapped_device *md, struct dm_dev *d);
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int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
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unsigned cookie, bool need_resize_uevent);
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void dm_internal_suspend(struct mapped_device *md);
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void dm_internal_resume(struct mapped_device *md);
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int dm_io_init(void);
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void dm_io_exit(void);
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int dm_kcopyd_init(void);
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void dm_kcopyd_exit(void);
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/*
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* Mempool operations
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*/
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struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
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unsigned integrity, unsigned per_bio_data_size,
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unsigned min_pool_size);
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void dm_free_md_mempools(struct dm_md_mempools *pools);
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/*
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* Various helpers
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*/
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unsigned dm_get_reserved_bio_based_ios(void);
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#endif
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