mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f8c3500cd1
persistent memory device that allows a guest VM to use DAX mechanisms to access a host-file with host-page-cache. It arranges for MAP_SYNC to be disabled and instead triggers a host fsync() when a 'write-cache flush' command is sent to the virtual disk device. - Miscellaneous small fixups. -----BEGIN PGP SIGNATURE----- iQIcBAABAgAGBQJdMHwpAAoJEB7SkWpmfYgCUYoP/3vcgYBAaXNksyALF0iowPoP z4J0KoaOA1CzRFEQtCWUQa84CWj+XoSewwSeyrIkqKQvx/gghXblK+GVjVzBn0BD hmmiKr8af4DdxfzYdEXJp65cCpIiVMaJiGr20Aj9ObwvWJb4QZbz9q7hnPt6KgiI jVND3BpP3OERb4ZFcibdmJT5foKooMcXVG6+luVe+hc1+ZZQxJBsBaqie4brQIFq j59NX3HfHH2fr1vVwnVH0CO4tgbgYg9wZ2EivGu6wBWvORjrr7KiSSbOYP68EBtd lUoNps+vQtGnfXGwNzAjp1wuknrQYYh4/KMKjep7hiZD39rgyvBpbHbyynKzQCWV REe8cXr/nwphsENvBAUBiqY999EWVIxdT2iaVaSA6K/31JQAC5AFyxVK/P2Ke1SK rvePZ++iLQ1o4phTxQPNlVUqF9jOrFVVICGwMDqaqSkOsD9YKQdFClfOF/1ntlDz V0bs+Y0Pe8AJCd9ESep4X+vHAWRRIb4EQIuwLaX8RJoY+r1fGye9RPthpYYzvXKp DI2iJztFO3anzj2i9htNPUFIaiUmIhzEvG32O2If2yc5FL02hMpHPoFx6vHhe6s3 f8OJ+olsJK+/IIrV8+DHqYvhzylOYIhmRTvIxIxaNDPHkhR1i2RDQ6KKK1YZmsr8 MjAZ+Ym0GadDivs+wcM6 =uAMG -----END PGP SIGNATURE----- Merge tag 'libnvdimm-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm Pull libnvdimm updates from Dan Williams: "Primarily just the virtio_pmem driver: - virtio_pmem The new virtio_pmem facility introduces a paravirtualized persistent memory device that allows a guest VM to use DAX mechanisms to access a host-file with host-page-cache. It arranges for MAP_SYNC to be disabled and instead triggers a host fsync() when a 'write-cache flush' command is sent to the virtual disk device. - Miscellaneous small fixups" * tag 'libnvdimm-for-5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: virtio_pmem: fix sparse warning xfs: disable map_sync for async flush ext4: disable map_sync for async flush dax: check synchronous mapping is supported dm: enable synchronous dax libnvdimm: add dax_dev sync flag virtio-pmem: Add virtio pmem driver libnvdimm: nd_region flush callback support libnvdimm, namespace: Drop uuid_t implementation detail
3238 lines
74 KiB
C
3238 lines
74 KiB
C
/*
|
|
* Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
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* Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#include "dm-core.h"
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#include "dm-rq.h"
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#include "dm-uevent.h"
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched/signal.h>
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#include <linux/blkpg.h>
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#include <linux/bio.h>
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#include <linux/mempool.h>
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#include <linux/dax.h>
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#include <linux/slab.h>
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#include <linux/idr.h>
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#include <linux/uio.h>
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#include <linux/hdreg.h>
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#include <linux/delay.h>
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#include <linux/wait.h>
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#include <linux/pr.h>
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#include <linux/refcount.h>
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#define DM_MSG_PREFIX "core"
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/*
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* Cookies are numeric values sent with CHANGE and REMOVE
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* uevents while resuming, removing or renaming the device.
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*/
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#define DM_COOKIE_ENV_VAR_NAME "DM_COOKIE"
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#define DM_COOKIE_LENGTH 24
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static const char *_name = DM_NAME;
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static unsigned int major = 0;
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static unsigned int _major = 0;
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static DEFINE_IDR(_minor_idr);
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static DEFINE_SPINLOCK(_minor_lock);
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static void do_deferred_remove(struct work_struct *w);
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static DECLARE_WORK(deferred_remove_work, do_deferred_remove);
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static struct workqueue_struct *deferred_remove_workqueue;
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atomic_t dm_global_event_nr = ATOMIC_INIT(0);
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DECLARE_WAIT_QUEUE_HEAD(dm_global_eventq);
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void dm_issue_global_event(void)
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{
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atomic_inc(&dm_global_event_nr);
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wake_up(&dm_global_eventq);
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}
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/*
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* One of these is allocated (on-stack) per original bio.
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*/
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struct clone_info {
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struct dm_table *map;
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struct bio *bio;
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struct dm_io *io;
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sector_t sector;
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unsigned sector_count;
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};
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/*
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* One of these is allocated per clone bio.
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*/
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#define DM_TIO_MAGIC 7282014
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struct dm_target_io {
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unsigned magic;
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struct dm_io *io;
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struct dm_target *ti;
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unsigned target_bio_nr;
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unsigned *len_ptr;
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bool inside_dm_io;
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struct bio clone;
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};
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/*
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* One of these is allocated per original bio.
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* It contains the first clone used for that original.
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*/
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#define DM_IO_MAGIC 5191977
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struct dm_io {
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unsigned magic;
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struct mapped_device *md;
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blk_status_t status;
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atomic_t io_count;
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struct bio *orig_bio;
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unsigned long start_time;
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spinlock_t endio_lock;
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struct dm_stats_aux stats_aux;
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/* last member of dm_target_io is 'struct bio' */
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struct dm_target_io tio;
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};
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void *dm_per_bio_data(struct bio *bio, size_t data_size)
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{
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struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
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if (!tio->inside_dm_io)
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return (char *)bio - offsetof(struct dm_target_io, clone) - data_size;
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return (char *)bio - offsetof(struct dm_target_io, clone) - offsetof(struct dm_io, tio) - data_size;
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}
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EXPORT_SYMBOL_GPL(dm_per_bio_data);
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struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size)
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{
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struct dm_io *io = (struct dm_io *)((char *)data + data_size);
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if (io->magic == DM_IO_MAGIC)
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return (struct bio *)((char *)io + offsetof(struct dm_io, tio) + offsetof(struct dm_target_io, clone));
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BUG_ON(io->magic != DM_TIO_MAGIC);
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return (struct bio *)((char *)io + offsetof(struct dm_target_io, clone));
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}
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EXPORT_SYMBOL_GPL(dm_bio_from_per_bio_data);
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unsigned dm_bio_get_target_bio_nr(const struct bio *bio)
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{
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return container_of(bio, struct dm_target_io, clone)->target_bio_nr;
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}
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EXPORT_SYMBOL_GPL(dm_bio_get_target_bio_nr);
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#define MINOR_ALLOCED ((void *)-1)
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/*
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* Bits for the md->flags field.
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*/
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#define DMF_BLOCK_IO_FOR_SUSPEND 0
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#define DMF_SUSPENDED 1
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#define DMF_FROZEN 2
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#define DMF_FREEING 3
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#define DMF_DELETING 4
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#define DMF_NOFLUSH_SUSPENDING 5
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#define DMF_DEFERRED_REMOVE 6
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#define DMF_SUSPENDED_INTERNALLY 7
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#define DM_NUMA_NODE NUMA_NO_NODE
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static int dm_numa_node = DM_NUMA_NODE;
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/*
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* For mempools pre-allocation at the table loading time.
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*/
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struct dm_md_mempools {
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struct bio_set bs;
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struct bio_set io_bs;
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};
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struct table_device {
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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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/*
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* Bio-based DM's mempools' reserved IOs set by the user.
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*/
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#define RESERVED_BIO_BASED_IOS 16
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static unsigned reserved_bio_based_ios = RESERVED_BIO_BASED_IOS;
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static int __dm_get_module_param_int(int *module_param, int min, int max)
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{
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int param = READ_ONCE(*module_param);
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int modified_param = 0;
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bool modified = true;
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if (param < min)
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modified_param = min;
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else if (param > max)
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modified_param = max;
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else
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modified = false;
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if (modified) {
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(void)cmpxchg(module_param, param, modified_param);
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param = modified_param;
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}
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return param;
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}
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unsigned __dm_get_module_param(unsigned *module_param,
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unsigned def, unsigned max)
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{
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unsigned param = READ_ONCE(*module_param);
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unsigned modified_param = 0;
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if (!param)
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modified_param = def;
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else if (param > max)
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modified_param = max;
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if (modified_param) {
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(void)cmpxchg(module_param, param, modified_param);
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param = modified_param;
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}
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return param;
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}
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unsigned dm_get_reserved_bio_based_ios(void)
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{
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return __dm_get_module_param(&reserved_bio_based_ios,
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RESERVED_BIO_BASED_IOS, DM_RESERVED_MAX_IOS);
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}
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EXPORT_SYMBOL_GPL(dm_get_reserved_bio_based_ios);
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static unsigned dm_get_numa_node(void)
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{
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return __dm_get_module_param_int(&dm_numa_node,
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DM_NUMA_NODE, num_online_nodes() - 1);
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}
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static int __init local_init(void)
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{
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int r;
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r = dm_uevent_init();
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if (r)
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return r;
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deferred_remove_workqueue = alloc_workqueue("kdmremove", WQ_UNBOUND, 1);
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if (!deferred_remove_workqueue) {
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r = -ENOMEM;
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goto out_uevent_exit;
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}
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_major = major;
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r = register_blkdev(_major, _name);
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if (r < 0)
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goto out_free_workqueue;
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if (!_major)
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_major = r;
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return 0;
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out_free_workqueue:
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destroy_workqueue(deferred_remove_workqueue);
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out_uevent_exit:
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dm_uevent_exit();
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return r;
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}
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static void local_exit(void)
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{
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flush_scheduled_work();
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destroy_workqueue(deferred_remove_workqueue);
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unregister_blkdev(_major, _name);
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dm_uevent_exit();
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_major = 0;
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DMINFO("cleaned up");
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}
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static int (*_inits[])(void) __initdata = {
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local_init,
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dm_target_init,
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dm_linear_init,
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dm_stripe_init,
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dm_io_init,
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dm_kcopyd_init,
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dm_interface_init,
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dm_statistics_init,
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};
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static void (*_exits[])(void) = {
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local_exit,
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dm_target_exit,
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dm_linear_exit,
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dm_stripe_exit,
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dm_io_exit,
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dm_kcopyd_exit,
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dm_interface_exit,
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dm_statistics_exit,
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};
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static int __init dm_init(void)
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{
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const int count = ARRAY_SIZE(_inits);
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int r, i;
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for (i = 0; i < count; i++) {
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r = _inits[i]();
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if (r)
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goto bad;
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}
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return 0;
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bad:
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while (i--)
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_exits[i]();
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return r;
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}
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static void __exit dm_exit(void)
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{
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int i = ARRAY_SIZE(_exits);
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while (i--)
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_exits[i]();
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/*
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* Should be empty by this point.
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*/
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idr_destroy(&_minor_idr);
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}
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/*
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* Block device functions
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*/
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int dm_deleting_md(struct mapped_device *md)
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{
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return test_bit(DMF_DELETING, &md->flags);
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}
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static int dm_blk_open(struct block_device *bdev, fmode_t mode)
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{
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struct mapped_device *md;
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spin_lock(&_minor_lock);
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md = bdev->bd_disk->private_data;
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if (!md)
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goto out;
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if (test_bit(DMF_FREEING, &md->flags) ||
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dm_deleting_md(md)) {
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md = NULL;
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goto out;
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}
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dm_get(md);
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atomic_inc(&md->open_count);
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out:
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spin_unlock(&_minor_lock);
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return md ? 0 : -ENXIO;
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}
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static void dm_blk_close(struct gendisk *disk, fmode_t mode)
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{
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struct mapped_device *md;
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spin_lock(&_minor_lock);
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md = disk->private_data;
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if (WARN_ON(!md))
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goto out;
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if (atomic_dec_and_test(&md->open_count) &&
|
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(test_bit(DMF_DEFERRED_REMOVE, &md->flags)))
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queue_work(deferred_remove_workqueue, &deferred_remove_work);
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dm_put(md);
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out:
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spin_unlock(&_minor_lock);
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}
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int dm_open_count(struct mapped_device *md)
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{
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return atomic_read(&md->open_count);
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}
|
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|
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/*
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* Guarantees nothing is using the device before it's deleted.
|
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*/
|
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int dm_lock_for_deletion(struct mapped_device *md, bool mark_deferred, bool only_deferred)
|
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{
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int r = 0;
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spin_lock(&_minor_lock);
|
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|
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if (dm_open_count(md)) {
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r = -EBUSY;
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if (mark_deferred)
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set_bit(DMF_DEFERRED_REMOVE, &md->flags);
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} else if (only_deferred && !test_bit(DMF_DEFERRED_REMOVE, &md->flags))
|
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r = -EEXIST;
|
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else
|
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set_bit(DMF_DELETING, &md->flags);
|
|
|
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spin_unlock(&_minor_lock);
|
|
|
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return r;
|
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}
|
|
|
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int dm_cancel_deferred_remove(struct mapped_device *md)
|
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{
|
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int r = 0;
|
|
|
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spin_lock(&_minor_lock);
|
|
|
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if (test_bit(DMF_DELETING, &md->flags))
|
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r = -EBUSY;
|
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else
|
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clear_bit(DMF_DEFERRED_REMOVE, &md->flags);
|
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|
|
spin_unlock(&_minor_lock);
|
|
|
|
return r;
|
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}
|
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|
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static void do_deferred_remove(struct work_struct *w)
|
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{
|
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dm_deferred_remove();
|
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}
|
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|
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sector_t dm_get_size(struct mapped_device *md)
|
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{
|
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return get_capacity(md->disk);
|
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}
|
|
|
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struct request_queue *dm_get_md_queue(struct mapped_device *md)
|
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{
|
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return md->queue;
|
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}
|
|
|
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struct dm_stats *dm_get_stats(struct mapped_device *md)
|
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{
|
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return &md->stats;
|
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}
|
|
|
|
static int dm_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
|
|
{
|
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struct mapped_device *md = bdev->bd_disk->private_data;
|
|
|
|
return dm_get_geometry(md, geo);
|
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}
|
|
|
|
static int dm_blk_report_zones(struct gendisk *disk, sector_t sector,
|
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struct blk_zone *zones, unsigned int *nr_zones)
|
|
{
|
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#ifdef CONFIG_BLK_DEV_ZONED
|
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struct mapped_device *md = disk->private_data;
|
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struct dm_target *tgt;
|
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struct dm_table *map;
|
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int srcu_idx, ret;
|
|
|
|
if (dm_suspended_md(md))
|
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return -EAGAIN;
|
|
|
|
map = dm_get_live_table(md, &srcu_idx);
|
|
if (!map)
|
|
return -EIO;
|
|
|
|
tgt = dm_table_find_target(map, sector);
|
|
if (!dm_target_is_valid(tgt)) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* If we are executing this, we already know that the block device
|
|
* is a zoned device and so each target should have support for that
|
|
* type of drive. A missing report_zones method means that the target
|
|
* driver has a problem.
|
|
*/
|
|
if (WARN_ON(!tgt->type->report_zones)) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* blkdev_report_zones() will loop and call this again to cover all the
|
|
* zones of the target, eventually moving on to the next target.
|
|
* So there is no need to loop here trying to fill the entire array
|
|
* of zones.
|
|
*/
|
|
ret = tgt->type->report_zones(tgt, sector, zones, nr_zones);
|
|
|
|
out:
|
|
dm_put_live_table(md, srcu_idx);
|
|
return ret;
|
|
#else
|
|
return -ENOTSUPP;
|
|
#endif
|
|
}
|
|
|
|
static int dm_prepare_ioctl(struct mapped_device *md, int *srcu_idx,
|
|
struct block_device **bdev)
|
|
__acquires(md->io_barrier)
|
|
{
|
|
struct dm_target *tgt;
|
|
struct dm_table *map;
|
|
int r;
|
|
|
|
retry:
|
|
r = -ENOTTY;
|
|
map = dm_get_live_table(md, srcu_idx);
|
|
if (!map || !dm_table_get_size(map))
|
|
return r;
|
|
|
|
/* We only support devices that have a single target */
|
|
if (dm_table_get_num_targets(map) != 1)
|
|
return r;
|
|
|
|
tgt = dm_table_get_target(map, 0);
|
|
if (!tgt->type->prepare_ioctl)
|
|
return r;
|
|
|
|
if (dm_suspended_md(md))
|
|
return -EAGAIN;
|
|
|
|
r = tgt->type->prepare_ioctl(tgt, bdev);
|
|
if (r == -ENOTCONN && !fatal_signal_pending(current)) {
|
|
dm_put_live_table(md, *srcu_idx);
|
|
msleep(10);
|
|
goto retry;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static void dm_unprepare_ioctl(struct mapped_device *md, int srcu_idx)
|
|
__releases(md->io_barrier)
|
|
{
|
|
dm_put_live_table(md, srcu_idx);
|
|
}
|
|
|
|
static int dm_blk_ioctl(struct block_device *bdev, fmode_t mode,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct mapped_device *md = bdev->bd_disk->private_data;
|
|
int r, srcu_idx;
|
|
|
|
r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
if (r > 0) {
|
|
/*
|
|
* Target determined this ioctl is being issued against a
|
|
* subset of the parent bdev; require extra privileges.
|
|
*/
|
|
if (!capable(CAP_SYS_RAWIO)) {
|
|
DMWARN_LIMIT(
|
|
"%s: sending ioctl %x to DM device without required privilege.",
|
|
current->comm, cmd);
|
|
r = -ENOIOCTLCMD;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
r = __blkdev_driver_ioctl(bdev, mode, cmd, arg);
|
|
out:
|
|
dm_unprepare_ioctl(md, srcu_idx);
|
|
return r;
|
|
}
|
|
|
|
static void start_io_acct(struct dm_io *io);
|
|
|
|
static struct dm_io *alloc_io(struct mapped_device *md, struct bio *bio)
|
|
{
|
|
struct dm_io *io;
|
|
struct dm_target_io *tio;
|
|
struct bio *clone;
|
|
|
|
clone = bio_alloc_bioset(GFP_NOIO, 0, &md->io_bs);
|
|
if (!clone)
|
|
return NULL;
|
|
|
|
tio = container_of(clone, struct dm_target_io, clone);
|
|
tio->inside_dm_io = true;
|
|
tio->io = NULL;
|
|
|
|
io = container_of(tio, struct dm_io, tio);
|
|
io->magic = DM_IO_MAGIC;
|
|
io->status = 0;
|
|
atomic_set(&io->io_count, 1);
|
|
io->orig_bio = bio;
|
|
io->md = md;
|
|
spin_lock_init(&io->endio_lock);
|
|
|
|
start_io_acct(io);
|
|
|
|
return io;
|
|
}
|
|
|
|
static void free_io(struct mapped_device *md, struct dm_io *io)
|
|
{
|
|
bio_put(&io->tio.clone);
|
|
}
|
|
|
|
static struct dm_target_io *alloc_tio(struct clone_info *ci, struct dm_target *ti,
|
|
unsigned target_bio_nr, gfp_t gfp_mask)
|
|
{
|
|
struct dm_target_io *tio;
|
|
|
|
if (!ci->io->tio.io) {
|
|
/* the dm_target_io embedded in ci->io is available */
|
|
tio = &ci->io->tio;
|
|
} else {
|
|
struct bio *clone = bio_alloc_bioset(gfp_mask, 0, &ci->io->md->bs);
|
|
if (!clone)
|
|
return NULL;
|
|
|
|
tio = container_of(clone, struct dm_target_io, clone);
|
|
tio->inside_dm_io = false;
|
|
}
|
|
|
|
tio->magic = DM_TIO_MAGIC;
|
|
tio->io = ci->io;
|
|
tio->ti = ti;
|
|
tio->target_bio_nr = target_bio_nr;
|
|
|
|
return tio;
|
|
}
|
|
|
|
static void free_tio(struct dm_target_io *tio)
|
|
{
|
|
if (tio->inside_dm_io)
|
|
return;
|
|
bio_put(&tio->clone);
|
|
}
|
|
|
|
static bool md_in_flight_bios(struct mapped_device *md)
|
|
{
|
|
int cpu;
|
|
struct hd_struct *part = &dm_disk(md)->part0;
|
|
long sum = 0;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
sum += part_stat_local_read_cpu(part, in_flight[0], cpu);
|
|
sum += part_stat_local_read_cpu(part, in_flight[1], cpu);
|
|
}
|
|
|
|
return sum != 0;
|
|
}
|
|
|
|
static bool md_in_flight(struct mapped_device *md)
|
|
{
|
|
if (queue_is_mq(md->queue))
|
|
return blk_mq_queue_inflight(md->queue);
|
|
else
|
|
return md_in_flight_bios(md);
|
|
}
|
|
|
|
static void start_io_acct(struct dm_io *io)
|
|
{
|
|
struct mapped_device *md = io->md;
|
|
struct bio *bio = io->orig_bio;
|
|
|
|
io->start_time = jiffies;
|
|
|
|
generic_start_io_acct(md->queue, bio_op(bio), bio_sectors(bio),
|
|
&dm_disk(md)->part0);
|
|
|
|
if (unlikely(dm_stats_used(&md->stats)))
|
|
dm_stats_account_io(&md->stats, bio_data_dir(bio),
|
|
bio->bi_iter.bi_sector, bio_sectors(bio),
|
|
false, 0, &io->stats_aux);
|
|
}
|
|
|
|
static void end_io_acct(struct dm_io *io)
|
|
{
|
|
struct mapped_device *md = io->md;
|
|
struct bio *bio = io->orig_bio;
|
|
unsigned long duration = jiffies - io->start_time;
|
|
|
|
generic_end_io_acct(md->queue, bio_op(bio), &dm_disk(md)->part0,
|
|
io->start_time);
|
|
|
|
if (unlikely(dm_stats_used(&md->stats)))
|
|
dm_stats_account_io(&md->stats, bio_data_dir(bio),
|
|
bio->bi_iter.bi_sector, bio_sectors(bio),
|
|
true, duration, &io->stats_aux);
|
|
|
|
/* nudge anyone waiting on suspend queue */
|
|
if (unlikely(wq_has_sleeper(&md->wait)))
|
|
wake_up(&md->wait);
|
|
}
|
|
|
|
/*
|
|
* Add the bio to the list of deferred io.
|
|
*/
|
|
static void queue_io(struct mapped_device *md, struct bio *bio)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&md->deferred_lock, flags);
|
|
bio_list_add(&md->deferred, bio);
|
|
spin_unlock_irqrestore(&md->deferred_lock, flags);
|
|
queue_work(md->wq, &md->work);
|
|
}
|
|
|
|
/*
|
|
* Everyone (including functions in this file), should use this
|
|
* function to access the md->map field, and make sure they call
|
|
* dm_put_live_table() when finished.
|
|
*/
|
|
struct dm_table *dm_get_live_table(struct mapped_device *md, int *srcu_idx) __acquires(md->io_barrier)
|
|
{
|
|
*srcu_idx = srcu_read_lock(&md->io_barrier);
|
|
|
|
return srcu_dereference(md->map, &md->io_barrier);
|
|
}
|
|
|
|
void dm_put_live_table(struct mapped_device *md, int srcu_idx) __releases(md->io_barrier)
|
|
{
|
|
srcu_read_unlock(&md->io_barrier, srcu_idx);
|
|
}
|
|
|
|
void dm_sync_table(struct mapped_device *md)
|
|
{
|
|
synchronize_srcu(&md->io_barrier);
|
|
synchronize_rcu_expedited();
|
|
}
|
|
|
|
/*
|
|
* A fast alternative to dm_get_live_table/dm_put_live_table.
|
|
* The caller must not block between these two functions.
|
|
*/
|
|
static struct dm_table *dm_get_live_table_fast(struct mapped_device *md) __acquires(RCU)
|
|
{
|
|
rcu_read_lock();
|
|
return rcu_dereference(md->map);
|
|
}
|
|
|
|
static void dm_put_live_table_fast(struct mapped_device *md) __releases(RCU)
|
|
{
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static char *_dm_claim_ptr = "I belong to device-mapper";
|
|
|
|
/*
|
|
* Open a table device so we can use it as a map destination.
|
|
*/
|
|
static int open_table_device(struct table_device *td, dev_t dev,
|
|
struct mapped_device *md)
|
|
{
|
|
struct block_device *bdev;
|
|
|
|
int r;
|
|
|
|
BUG_ON(td->dm_dev.bdev);
|
|
|
|
bdev = blkdev_get_by_dev(dev, td->dm_dev.mode | FMODE_EXCL, _dm_claim_ptr);
|
|
if (IS_ERR(bdev))
|
|
return PTR_ERR(bdev);
|
|
|
|
r = bd_link_disk_holder(bdev, dm_disk(md));
|
|
if (r) {
|
|
blkdev_put(bdev, td->dm_dev.mode | FMODE_EXCL);
|
|
return r;
|
|
}
|
|
|
|
td->dm_dev.bdev = bdev;
|
|
td->dm_dev.dax_dev = dax_get_by_host(bdev->bd_disk->disk_name);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Close a table device that we've been using.
|
|
*/
|
|
static void close_table_device(struct table_device *td, struct mapped_device *md)
|
|
{
|
|
if (!td->dm_dev.bdev)
|
|
return;
|
|
|
|
bd_unlink_disk_holder(td->dm_dev.bdev, dm_disk(md));
|
|
blkdev_put(td->dm_dev.bdev, td->dm_dev.mode | FMODE_EXCL);
|
|
put_dax(td->dm_dev.dax_dev);
|
|
td->dm_dev.bdev = NULL;
|
|
td->dm_dev.dax_dev = NULL;
|
|
}
|
|
|
|
static struct table_device *find_table_device(struct list_head *l, dev_t dev,
|
|
fmode_t mode)
|
|
{
|
|
struct table_device *td;
|
|
|
|
list_for_each_entry(td, l, list)
|
|
if (td->dm_dev.bdev->bd_dev == dev && td->dm_dev.mode == mode)
|
|
return td;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int dm_get_table_device(struct mapped_device *md, dev_t dev, fmode_t mode,
|
|
struct dm_dev **result)
|
|
{
|
|
int r;
|
|
struct table_device *td;
|
|
|
|
mutex_lock(&md->table_devices_lock);
|
|
td = find_table_device(&md->table_devices, dev, mode);
|
|
if (!td) {
|
|
td = kmalloc_node(sizeof(*td), GFP_KERNEL, md->numa_node_id);
|
|
if (!td) {
|
|
mutex_unlock(&md->table_devices_lock);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
td->dm_dev.mode = mode;
|
|
td->dm_dev.bdev = NULL;
|
|
|
|
if ((r = open_table_device(td, dev, md))) {
|
|
mutex_unlock(&md->table_devices_lock);
|
|
kfree(td);
|
|
return r;
|
|
}
|
|
|
|
format_dev_t(td->dm_dev.name, dev);
|
|
|
|
refcount_set(&td->count, 1);
|
|
list_add(&td->list, &md->table_devices);
|
|
} else {
|
|
refcount_inc(&td->count);
|
|
}
|
|
mutex_unlock(&md->table_devices_lock);
|
|
|
|
*result = &td->dm_dev;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_get_table_device);
|
|
|
|
void dm_put_table_device(struct mapped_device *md, struct dm_dev *d)
|
|
{
|
|
struct table_device *td = container_of(d, struct table_device, dm_dev);
|
|
|
|
mutex_lock(&md->table_devices_lock);
|
|
if (refcount_dec_and_test(&td->count)) {
|
|
close_table_device(td, md);
|
|
list_del(&td->list);
|
|
kfree(td);
|
|
}
|
|
mutex_unlock(&md->table_devices_lock);
|
|
}
|
|
EXPORT_SYMBOL(dm_put_table_device);
|
|
|
|
static void free_table_devices(struct list_head *devices)
|
|
{
|
|
struct list_head *tmp, *next;
|
|
|
|
list_for_each_safe(tmp, next, devices) {
|
|
struct table_device *td = list_entry(tmp, struct table_device, list);
|
|
|
|
DMWARN("dm_destroy: %s still exists with %d references",
|
|
td->dm_dev.name, refcount_read(&td->count));
|
|
kfree(td);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the geometry associated with a dm device
|
|
*/
|
|
int dm_get_geometry(struct mapped_device *md, struct hd_geometry *geo)
|
|
{
|
|
*geo = md->geometry;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Set the geometry of a device.
|
|
*/
|
|
int dm_set_geometry(struct mapped_device *md, struct hd_geometry *geo)
|
|
{
|
|
sector_t sz = (sector_t)geo->cylinders * geo->heads * geo->sectors;
|
|
|
|
if (geo->start > sz) {
|
|
DMWARN("Start sector is beyond the geometry limits.");
|
|
return -EINVAL;
|
|
}
|
|
|
|
md->geometry = *geo;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __noflush_suspending(struct mapped_device *md)
|
|
{
|
|
return test_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
|
|
}
|
|
|
|
/*
|
|
* Decrements the number of outstanding ios that a bio has been
|
|
* cloned into, completing the original io if necc.
|
|
*/
|
|
static void dec_pending(struct dm_io *io, blk_status_t error)
|
|
{
|
|
unsigned long flags;
|
|
blk_status_t io_error;
|
|
struct bio *bio;
|
|
struct mapped_device *md = io->md;
|
|
|
|
/* Push-back supersedes any I/O errors */
|
|
if (unlikely(error)) {
|
|
spin_lock_irqsave(&io->endio_lock, flags);
|
|
if (!(io->status == BLK_STS_DM_REQUEUE && __noflush_suspending(md)))
|
|
io->status = error;
|
|
spin_unlock_irqrestore(&io->endio_lock, flags);
|
|
}
|
|
|
|
if (atomic_dec_and_test(&io->io_count)) {
|
|
if (io->status == BLK_STS_DM_REQUEUE) {
|
|
/*
|
|
* Target requested pushing back the I/O.
|
|
*/
|
|
spin_lock_irqsave(&md->deferred_lock, flags);
|
|
if (__noflush_suspending(md))
|
|
/* NOTE early return due to BLK_STS_DM_REQUEUE below */
|
|
bio_list_add_head(&md->deferred, io->orig_bio);
|
|
else
|
|
/* noflush suspend was interrupted. */
|
|
io->status = BLK_STS_IOERR;
|
|
spin_unlock_irqrestore(&md->deferred_lock, flags);
|
|
}
|
|
|
|
io_error = io->status;
|
|
bio = io->orig_bio;
|
|
end_io_acct(io);
|
|
free_io(md, io);
|
|
|
|
if (io_error == BLK_STS_DM_REQUEUE)
|
|
return;
|
|
|
|
if ((bio->bi_opf & REQ_PREFLUSH) && bio->bi_iter.bi_size) {
|
|
/*
|
|
* Preflush done for flush with data, reissue
|
|
* without REQ_PREFLUSH.
|
|
*/
|
|
bio->bi_opf &= ~REQ_PREFLUSH;
|
|
queue_io(md, bio);
|
|
} else {
|
|
/* done with normal IO or empty flush */
|
|
if (io_error)
|
|
bio->bi_status = io_error;
|
|
bio_endio(bio);
|
|
}
|
|
}
|
|
}
|
|
|
|
void disable_discard(struct mapped_device *md)
|
|
{
|
|
struct queue_limits *limits = dm_get_queue_limits(md);
|
|
|
|
/* device doesn't really support DISCARD, disable it */
|
|
limits->max_discard_sectors = 0;
|
|
blk_queue_flag_clear(QUEUE_FLAG_DISCARD, md->queue);
|
|
}
|
|
|
|
void disable_write_same(struct mapped_device *md)
|
|
{
|
|
struct queue_limits *limits = dm_get_queue_limits(md);
|
|
|
|
/* device doesn't really support WRITE SAME, disable it */
|
|
limits->max_write_same_sectors = 0;
|
|
}
|
|
|
|
void disable_write_zeroes(struct mapped_device *md)
|
|
{
|
|
struct queue_limits *limits = dm_get_queue_limits(md);
|
|
|
|
/* device doesn't really support WRITE ZEROES, disable it */
|
|
limits->max_write_zeroes_sectors = 0;
|
|
}
|
|
|
|
static void clone_endio(struct bio *bio)
|
|
{
|
|
blk_status_t error = bio->bi_status;
|
|
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
|
|
struct dm_io *io = tio->io;
|
|
struct mapped_device *md = tio->io->md;
|
|
dm_endio_fn endio = tio->ti->type->end_io;
|
|
|
|
if (unlikely(error == BLK_STS_TARGET) && md->type != DM_TYPE_NVME_BIO_BASED) {
|
|
if (bio_op(bio) == REQ_OP_DISCARD &&
|
|
!bio->bi_disk->queue->limits.max_discard_sectors)
|
|
disable_discard(md);
|
|
else if (bio_op(bio) == REQ_OP_WRITE_SAME &&
|
|
!bio->bi_disk->queue->limits.max_write_same_sectors)
|
|
disable_write_same(md);
|
|
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES &&
|
|
!bio->bi_disk->queue->limits.max_write_zeroes_sectors)
|
|
disable_write_zeroes(md);
|
|
}
|
|
|
|
if (endio) {
|
|
int r = endio(tio->ti, bio, &error);
|
|
switch (r) {
|
|
case DM_ENDIO_REQUEUE:
|
|
error = BLK_STS_DM_REQUEUE;
|
|
/*FALLTHRU*/
|
|
case DM_ENDIO_DONE:
|
|
break;
|
|
case DM_ENDIO_INCOMPLETE:
|
|
/* The target will handle the io */
|
|
return;
|
|
default:
|
|
DMWARN("unimplemented target endio return value: %d", r);
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
free_tio(tio);
|
|
dec_pending(io, error);
|
|
}
|
|
|
|
/*
|
|
* Return maximum size of I/O possible at the supplied sector up to the current
|
|
* target boundary.
|
|
*/
|
|
static sector_t max_io_len_target_boundary(sector_t sector, struct dm_target *ti)
|
|
{
|
|
sector_t target_offset = dm_target_offset(ti, sector);
|
|
|
|
return ti->len - target_offset;
|
|
}
|
|
|
|
static sector_t max_io_len(sector_t sector, struct dm_target *ti)
|
|
{
|
|
sector_t len = max_io_len_target_boundary(sector, ti);
|
|
sector_t offset, max_len;
|
|
|
|
/*
|
|
* Does the target need to split even further?
|
|
*/
|
|
if (ti->max_io_len) {
|
|
offset = dm_target_offset(ti, sector);
|
|
if (unlikely(ti->max_io_len & (ti->max_io_len - 1)))
|
|
max_len = sector_div(offset, ti->max_io_len);
|
|
else
|
|
max_len = offset & (ti->max_io_len - 1);
|
|
max_len = ti->max_io_len - max_len;
|
|
|
|
if (len > max_len)
|
|
len = max_len;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
int dm_set_target_max_io_len(struct dm_target *ti, sector_t len)
|
|
{
|
|
if (len > UINT_MAX) {
|
|
DMERR("Specified maximum size of target IO (%llu) exceeds limit (%u)",
|
|
(unsigned long long)len, UINT_MAX);
|
|
ti->error = "Maximum size of target IO is too large";
|
|
return -EINVAL;
|
|
}
|
|
|
|
ti->max_io_len = (uint32_t) len;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_set_target_max_io_len);
|
|
|
|
static struct dm_target *dm_dax_get_live_target(struct mapped_device *md,
|
|
sector_t sector, int *srcu_idx)
|
|
__acquires(md->io_barrier)
|
|
{
|
|
struct dm_table *map;
|
|
struct dm_target *ti;
|
|
|
|
map = dm_get_live_table(md, srcu_idx);
|
|
if (!map)
|
|
return NULL;
|
|
|
|
ti = dm_table_find_target(map, sector);
|
|
if (!dm_target_is_valid(ti))
|
|
return NULL;
|
|
|
|
return ti;
|
|
}
|
|
|
|
static long dm_dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff,
|
|
long nr_pages, void **kaddr, pfn_t *pfn)
|
|
{
|
|
struct mapped_device *md = dax_get_private(dax_dev);
|
|
sector_t sector = pgoff * PAGE_SECTORS;
|
|
struct dm_target *ti;
|
|
long len, ret = -EIO;
|
|
int srcu_idx;
|
|
|
|
ti = dm_dax_get_live_target(md, sector, &srcu_idx);
|
|
|
|
if (!ti)
|
|
goto out;
|
|
if (!ti->type->direct_access)
|
|
goto out;
|
|
len = max_io_len(sector, ti) / PAGE_SECTORS;
|
|
if (len < 1)
|
|
goto out;
|
|
nr_pages = min(len, nr_pages);
|
|
ret = ti->type->direct_access(ti, pgoff, nr_pages, kaddr, pfn);
|
|
|
|
out:
|
|
dm_put_live_table(md, srcu_idx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool dm_dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
|
|
int blocksize, sector_t start, sector_t len)
|
|
{
|
|
struct mapped_device *md = dax_get_private(dax_dev);
|
|
struct dm_table *map;
|
|
int srcu_idx;
|
|
bool ret;
|
|
|
|
map = dm_get_live_table(md, &srcu_idx);
|
|
if (!map)
|
|
return false;
|
|
|
|
ret = dm_table_supports_dax(map, device_supports_dax, &blocksize);
|
|
|
|
dm_put_live_table(md, srcu_idx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static size_t dm_dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff,
|
|
void *addr, size_t bytes, struct iov_iter *i)
|
|
{
|
|
struct mapped_device *md = dax_get_private(dax_dev);
|
|
sector_t sector = pgoff * PAGE_SECTORS;
|
|
struct dm_target *ti;
|
|
long ret = 0;
|
|
int srcu_idx;
|
|
|
|
ti = dm_dax_get_live_target(md, sector, &srcu_idx);
|
|
|
|
if (!ti)
|
|
goto out;
|
|
if (!ti->type->dax_copy_from_iter) {
|
|
ret = copy_from_iter(addr, bytes, i);
|
|
goto out;
|
|
}
|
|
ret = ti->type->dax_copy_from_iter(ti, pgoff, addr, bytes, i);
|
|
out:
|
|
dm_put_live_table(md, srcu_idx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static size_t dm_dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff,
|
|
void *addr, size_t bytes, struct iov_iter *i)
|
|
{
|
|
struct mapped_device *md = dax_get_private(dax_dev);
|
|
sector_t sector = pgoff * PAGE_SECTORS;
|
|
struct dm_target *ti;
|
|
long ret = 0;
|
|
int srcu_idx;
|
|
|
|
ti = dm_dax_get_live_target(md, sector, &srcu_idx);
|
|
|
|
if (!ti)
|
|
goto out;
|
|
if (!ti->type->dax_copy_to_iter) {
|
|
ret = copy_to_iter(addr, bytes, i);
|
|
goto out;
|
|
}
|
|
ret = ti->type->dax_copy_to_iter(ti, pgoff, addr, bytes, i);
|
|
out:
|
|
dm_put_live_table(md, srcu_idx);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* A target may call dm_accept_partial_bio only from the map routine. It is
|
|
* allowed for all bio types except REQ_PREFLUSH and REQ_OP_ZONE_RESET.
|
|
*
|
|
* dm_accept_partial_bio informs the dm that the target only wants to process
|
|
* additional n_sectors sectors of the bio and the rest of the data should be
|
|
* sent in a next bio.
|
|
*
|
|
* A diagram that explains the arithmetics:
|
|
* +--------------------+---------------+-------+
|
|
* | 1 | 2 | 3 |
|
|
* +--------------------+---------------+-------+
|
|
*
|
|
* <-------------- *tio->len_ptr --------------->
|
|
* <------- bi_size ------->
|
|
* <-- n_sectors -->
|
|
*
|
|
* Region 1 was already iterated over with bio_advance or similar function.
|
|
* (it may be empty if the target doesn't use bio_advance)
|
|
* Region 2 is the remaining bio size that the target wants to process.
|
|
* (it may be empty if region 1 is non-empty, although there is no reason
|
|
* to make it empty)
|
|
* The target requires that region 3 is to be sent in the next bio.
|
|
*
|
|
* If the target wants to receive multiple copies of the bio (via num_*bios, etc),
|
|
* the partially processed part (the sum of regions 1+2) must be the same for all
|
|
* copies of the bio.
|
|
*/
|
|
void dm_accept_partial_bio(struct bio *bio, unsigned n_sectors)
|
|
{
|
|
struct dm_target_io *tio = container_of(bio, struct dm_target_io, clone);
|
|
unsigned bi_size = bio->bi_iter.bi_size >> SECTOR_SHIFT;
|
|
BUG_ON(bio->bi_opf & REQ_PREFLUSH);
|
|
BUG_ON(bi_size > *tio->len_ptr);
|
|
BUG_ON(n_sectors > bi_size);
|
|
*tio->len_ptr -= bi_size - n_sectors;
|
|
bio->bi_iter.bi_size = n_sectors << SECTOR_SHIFT;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_accept_partial_bio);
|
|
|
|
/*
|
|
* The zone descriptors obtained with a zone report indicate
|
|
* zone positions within the underlying device of the target. The zone
|
|
* descriptors must be remapped to match their position within the dm device.
|
|
* The caller target should obtain the zones information using
|
|
* blkdev_report_zones() to ensure that remapping for partition offset is
|
|
* already handled.
|
|
*/
|
|
void dm_remap_zone_report(struct dm_target *ti, sector_t start,
|
|
struct blk_zone *zones, unsigned int *nr_zones)
|
|
{
|
|
#ifdef CONFIG_BLK_DEV_ZONED
|
|
struct blk_zone *zone;
|
|
unsigned int nrz = *nr_zones;
|
|
int i;
|
|
|
|
/*
|
|
* Remap the start sector and write pointer position of the zones in
|
|
* the array. Since we may have obtained from the target underlying
|
|
* device more zones that the target size, also adjust the number
|
|
* of zones.
|
|
*/
|
|
for (i = 0; i < nrz; i++) {
|
|
zone = zones + i;
|
|
if (zone->start >= start + ti->len) {
|
|
memset(zone, 0, sizeof(struct blk_zone) * (nrz - i));
|
|
break;
|
|
}
|
|
|
|
zone->start = zone->start + ti->begin - start;
|
|
if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
|
|
continue;
|
|
|
|
if (zone->cond == BLK_ZONE_COND_FULL)
|
|
zone->wp = zone->start + zone->len;
|
|
else if (zone->cond == BLK_ZONE_COND_EMPTY)
|
|
zone->wp = zone->start;
|
|
else
|
|
zone->wp = zone->wp + ti->begin - start;
|
|
}
|
|
|
|
*nr_zones = i;
|
|
#else /* !CONFIG_BLK_DEV_ZONED */
|
|
*nr_zones = 0;
|
|
#endif
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_remap_zone_report);
|
|
|
|
static blk_qc_t __map_bio(struct dm_target_io *tio)
|
|
{
|
|
int r;
|
|
sector_t sector;
|
|
struct bio *clone = &tio->clone;
|
|
struct dm_io *io = tio->io;
|
|
struct mapped_device *md = io->md;
|
|
struct dm_target *ti = tio->ti;
|
|
blk_qc_t ret = BLK_QC_T_NONE;
|
|
|
|
clone->bi_end_io = clone_endio;
|
|
|
|
/*
|
|
* Map the clone. If r == 0 we don't need to do
|
|
* anything, the target has assumed ownership of
|
|
* this io.
|
|
*/
|
|
atomic_inc(&io->io_count);
|
|
sector = clone->bi_iter.bi_sector;
|
|
|
|
r = ti->type->map(ti, clone);
|
|
switch (r) {
|
|
case DM_MAPIO_SUBMITTED:
|
|
break;
|
|
case DM_MAPIO_REMAPPED:
|
|
/* the bio has been remapped so dispatch it */
|
|
trace_block_bio_remap(clone->bi_disk->queue, clone,
|
|
bio_dev(io->orig_bio), sector);
|
|
if (md->type == DM_TYPE_NVME_BIO_BASED)
|
|
ret = direct_make_request(clone);
|
|
else
|
|
ret = generic_make_request(clone);
|
|
break;
|
|
case DM_MAPIO_KILL:
|
|
free_tio(tio);
|
|
dec_pending(io, BLK_STS_IOERR);
|
|
break;
|
|
case DM_MAPIO_REQUEUE:
|
|
free_tio(tio);
|
|
dec_pending(io, BLK_STS_DM_REQUEUE);
|
|
break;
|
|
default:
|
|
DMWARN("unimplemented target map return value: %d", r);
|
|
BUG();
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void bio_setup_sector(struct bio *bio, sector_t sector, unsigned len)
|
|
{
|
|
bio->bi_iter.bi_sector = sector;
|
|
bio->bi_iter.bi_size = to_bytes(len);
|
|
}
|
|
|
|
/*
|
|
* Creates a bio that consists of range of complete bvecs.
|
|
*/
|
|
static int clone_bio(struct dm_target_io *tio, struct bio *bio,
|
|
sector_t sector, unsigned len)
|
|
{
|
|
struct bio *clone = &tio->clone;
|
|
|
|
__bio_clone_fast(clone, bio);
|
|
|
|
if (bio_integrity(bio)) {
|
|
int r;
|
|
|
|
if (unlikely(!dm_target_has_integrity(tio->ti->type) &&
|
|
!dm_target_passes_integrity(tio->ti->type))) {
|
|
DMWARN("%s: the target %s doesn't support integrity data.",
|
|
dm_device_name(tio->io->md),
|
|
tio->ti->type->name);
|
|
return -EIO;
|
|
}
|
|
|
|
r = bio_integrity_clone(clone, bio, GFP_NOIO);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
bio_advance(clone, to_bytes(sector - clone->bi_iter.bi_sector));
|
|
clone->bi_iter.bi_size = to_bytes(len);
|
|
|
|
if (bio_integrity(bio))
|
|
bio_integrity_trim(clone);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void alloc_multiple_bios(struct bio_list *blist, struct clone_info *ci,
|
|
struct dm_target *ti, unsigned num_bios)
|
|
{
|
|
struct dm_target_io *tio;
|
|
int try;
|
|
|
|
if (!num_bios)
|
|
return;
|
|
|
|
if (num_bios == 1) {
|
|
tio = alloc_tio(ci, ti, 0, GFP_NOIO);
|
|
bio_list_add(blist, &tio->clone);
|
|
return;
|
|
}
|
|
|
|
for (try = 0; try < 2; try++) {
|
|
int bio_nr;
|
|
struct bio *bio;
|
|
|
|
if (try)
|
|
mutex_lock(&ci->io->md->table_devices_lock);
|
|
for (bio_nr = 0; bio_nr < num_bios; bio_nr++) {
|
|
tio = alloc_tio(ci, ti, bio_nr, try ? GFP_NOIO : GFP_NOWAIT);
|
|
if (!tio)
|
|
break;
|
|
|
|
bio_list_add(blist, &tio->clone);
|
|
}
|
|
if (try)
|
|
mutex_unlock(&ci->io->md->table_devices_lock);
|
|
if (bio_nr == num_bios)
|
|
return;
|
|
|
|
while ((bio = bio_list_pop(blist))) {
|
|
tio = container_of(bio, struct dm_target_io, clone);
|
|
free_tio(tio);
|
|
}
|
|
}
|
|
}
|
|
|
|
static blk_qc_t __clone_and_map_simple_bio(struct clone_info *ci,
|
|
struct dm_target_io *tio, unsigned *len)
|
|
{
|
|
struct bio *clone = &tio->clone;
|
|
|
|
tio->len_ptr = len;
|
|
|
|
__bio_clone_fast(clone, ci->bio);
|
|
if (len)
|
|
bio_setup_sector(clone, ci->sector, *len);
|
|
|
|
return __map_bio(tio);
|
|
}
|
|
|
|
static void __send_duplicate_bios(struct clone_info *ci, struct dm_target *ti,
|
|
unsigned num_bios, unsigned *len)
|
|
{
|
|
struct bio_list blist = BIO_EMPTY_LIST;
|
|
struct bio *bio;
|
|
struct dm_target_io *tio;
|
|
|
|
alloc_multiple_bios(&blist, ci, ti, num_bios);
|
|
|
|
while ((bio = bio_list_pop(&blist))) {
|
|
tio = container_of(bio, struct dm_target_io, clone);
|
|
(void) __clone_and_map_simple_bio(ci, tio, len);
|
|
}
|
|
}
|
|
|
|
static int __send_empty_flush(struct clone_info *ci)
|
|
{
|
|
unsigned target_nr = 0;
|
|
struct dm_target *ti;
|
|
|
|
/*
|
|
* Empty flush uses a statically initialized bio, as the base for
|
|
* cloning. However, blkg association requires that a bdev is
|
|
* associated with a gendisk, which doesn't happen until the bdev is
|
|
* opened. So, blkg association is done at issue time of the flush
|
|
* rather than when the device is created in alloc_dev().
|
|
*/
|
|
bio_set_dev(ci->bio, ci->io->md->bdev);
|
|
|
|
BUG_ON(bio_has_data(ci->bio));
|
|
while ((ti = dm_table_get_target(ci->map, target_nr++)))
|
|
__send_duplicate_bios(ci, ti, ti->num_flush_bios, NULL);
|
|
|
|
bio_disassociate_blkg(ci->bio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __clone_and_map_data_bio(struct clone_info *ci, struct dm_target *ti,
|
|
sector_t sector, unsigned *len)
|
|
{
|
|
struct bio *bio = ci->bio;
|
|
struct dm_target_io *tio;
|
|
int r;
|
|
|
|
tio = alloc_tio(ci, ti, 0, GFP_NOIO);
|
|
tio->len_ptr = len;
|
|
r = clone_bio(tio, bio, sector, *len);
|
|
if (r < 0) {
|
|
free_tio(tio);
|
|
return r;
|
|
}
|
|
(void) __map_bio(tio);
|
|
|
|
return 0;
|
|
}
|
|
|
|
typedef unsigned (*get_num_bios_fn)(struct dm_target *ti);
|
|
|
|
static unsigned get_num_discard_bios(struct dm_target *ti)
|
|
{
|
|
return ti->num_discard_bios;
|
|
}
|
|
|
|
static unsigned get_num_secure_erase_bios(struct dm_target *ti)
|
|
{
|
|
return ti->num_secure_erase_bios;
|
|
}
|
|
|
|
static unsigned get_num_write_same_bios(struct dm_target *ti)
|
|
{
|
|
return ti->num_write_same_bios;
|
|
}
|
|
|
|
static unsigned get_num_write_zeroes_bios(struct dm_target *ti)
|
|
{
|
|
return ti->num_write_zeroes_bios;
|
|
}
|
|
|
|
static int __send_changing_extent_only(struct clone_info *ci, struct dm_target *ti,
|
|
unsigned num_bios)
|
|
{
|
|
unsigned len;
|
|
|
|
/*
|
|
* Even though the device advertised support for this type of
|
|
* request, that does not mean every target supports it, and
|
|
* reconfiguration might also have changed that since the
|
|
* check was performed.
|
|
*/
|
|
if (!num_bios)
|
|
return -EOPNOTSUPP;
|
|
|
|
len = min((sector_t)ci->sector_count, max_io_len_target_boundary(ci->sector, ti));
|
|
|
|
__send_duplicate_bios(ci, ti, num_bios, &len);
|
|
|
|
ci->sector += len;
|
|
ci->sector_count -= len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __send_discard(struct clone_info *ci, struct dm_target *ti)
|
|
{
|
|
return __send_changing_extent_only(ci, ti, get_num_discard_bios(ti));
|
|
}
|
|
|
|
static int __send_secure_erase(struct clone_info *ci, struct dm_target *ti)
|
|
{
|
|
return __send_changing_extent_only(ci, ti, get_num_secure_erase_bios(ti));
|
|
}
|
|
|
|
static int __send_write_same(struct clone_info *ci, struct dm_target *ti)
|
|
{
|
|
return __send_changing_extent_only(ci, ti, get_num_write_same_bios(ti));
|
|
}
|
|
|
|
static int __send_write_zeroes(struct clone_info *ci, struct dm_target *ti)
|
|
{
|
|
return __send_changing_extent_only(ci, ti, get_num_write_zeroes_bios(ti));
|
|
}
|
|
|
|
static bool is_abnormal_io(struct bio *bio)
|
|
{
|
|
bool r = false;
|
|
|
|
switch (bio_op(bio)) {
|
|
case REQ_OP_DISCARD:
|
|
case REQ_OP_SECURE_ERASE:
|
|
case REQ_OP_WRITE_SAME:
|
|
case REQ_OP_WRITE_ZEROES:
|
|
r = true;
|
|
break;
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static bool __process_abnormal_io(struct clone_info *ci, struct dm_target *ti,
|
|
int *result)
|
|
{
|
|
struct bio *bio = ci->bio;
|
|
|
|
if (bio_op(bio) == REQ_OP_DISCARD)
|
|
*result = __send_discard(ci, ti);
|
|
else if (bio_op(bio) == REQ_OP_SECURE_ERASE)
|
|
*result = __send_secure_erase(ci, ti);
|
|
else if (bio_op(bio) == REQ_OP_WRITE_SAME)
|
|
*result = __send_write_same(ci, ti);
|
|
else if (bio_op(bio) == REQ_OP_WRITE_ZEROES)
|
|
*result = __send_write_zeroes(ci, ti);
|
|
else
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Select the correct strategy for processing a non-flush bio.
|
|
*/
|
|
static int __split_and_process_non_flush(struct clone_info *ci)
|
|
{
|
|
struct dm_target *ti;
|
|
unsigned len;
|
|
int r;
|
|
|
|
ti = dm_table_find_target(ci->map, ci->sector);
|
|
if (!dm_target_is_valid(ti))
|
|
return -EIO;
|
|
|
|
if (__process_abnormal_io(ci, ti, &r))
|
|
return r;
|
|
|
|
len = min_t(sector_t, max_io_len(ci->sector, ti), ci->sector_count);
|
|
|
|
r = __clone_and_map_data_bio(ci, ti, ci->sector, &len);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ci->sector += len;
|
|
ci->sector_count -= len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void init_clone_info(struct clone_info *ci, struct mapped_device *md,
|
|
struct dm_table *map, struct bio *bio)
|
|
{
|
|
ci->map = map;
|
|
ci->io = alloc_io(md, bio);
|
|
ci->sector = bio->bi_iter.bi_sector;
|
|
}
|
|
|
|
#define __dm_part_stat_sub(part, field, subnd) \
|
|
(part_stat_get(part, field) -= (subnd))
|
|
|
|
/*
|
|
* Entry point to split a bio into clones and submit them to the targets.
|
|
*/
|
|
static blk_qc_t __split_and_process_bio(struct mapped_device *md,
|
|
struct dm_table *map, struct bio *bio)
|
|
{
|
|
struct clone_info ci;
|
|
blk_qc_t ret = BLK_QC_T_NONE;
|
|
int error = 0;
|
|
|
|
init_clone_info(&ci, md, map, bio);
|
|
|
|
if (bio->bi_opf & REQ_PREFLUSH) {
|
|
struct bio flush_bio;
|
|
|
|
/*
|
|
* Use an on-stack bio for this, it's safe since we don't
|
|
* need to reference it after submit. It's just used as
|
|
* the basis for the clone(s).
|
|
*/
|
|
bio_init(&flush_bio, NULL, 0);
|
|
flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC;
|
|
ci.bio = &flush_bio;
|
|
ci.sector_count = 0;
|
|
error = __send_empty_flush(&ci);
|
|
/* dec_pending submits any data associated with flush */
|
|
} else if (bio_op(bio) == REQ_OP_ZONE_RESET) {
|
|
ci.bio = bio;
|
|
ci.sector_count = 0;
|
|
error = __split_and_process_non_flush(&ci);
|
|
} else {
|
|
ci.bio = bio;
|
|
ci.sector_count = bio_sectors(bio);
|
|
while (ci.sector_count && !error) {
|
|
error = __split_and_process_non_flush(&ci);
|
|
if (current->bio_list && ci.sector_count && !error) {
|
|
/*
|
|
* Remainder must be passed to generic_make_request()
|
|
* so that it gets handled *after* bios already submitted
|
|
* have been completely processed.
|
|
* We take a clone of the original to store in
|
|
* ci.io->orig_bio to be used by end_io_acct() and
|
|
* for dec_pending to use for completion handling.
|
|
*/
|
|
struct bio *b = bio_split(bio, bio_sectors(bio) - ci.sector_count,
|
|
GFP_NOIO, &md->queue->bio_split);
|
|
ci.io->orig_bio = b;
|
|
|
|
/*
|
|
* Adjust IO stats for each split, otherwise upon queue
|
|
* reentry there will be redundant IO accounting.
|
|
* NOTE: this is a stop-gap fix, a proper fix involves
|
|
* significant refactoring of DM core's bio splitting
|
|
* (by eliminating DM's splitting and just using bio_split)
|
|
*/
|
|
part_stat_lock();
|
|
__dm_part_stat_sub(&dm_disk(md)->part0,
|
|
sectors[op_stat_group(bio_op(bio))], ci.sector_count);
|
|
part_stat_unlock();
|
|
|
|
bio_chain(b, bio);
|
|
trace_block_split(md->queue, b, bio->bi_iter.bi_sector);
|
|
ret = generic_make_request(bio);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* drop the extra reference count */
|
|
dec_pending(ci.io, errno_to_blk_status(error));
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Optimized variant of __split_and_process_bio that leverages the
|
|
* fact that targets that use it do _not_ have a need to split bios.
|
|
*/
|
|
static blk_qc_t __process_bio(struct mapped_device *md, struct dm_table *map,
|
|
struct bio *bio, struct dm_target *ti)
|
|
{
|
|
struct clone_info ci;
|
|
blk_qc_t ret = BLK_QC_T_NONE;
|
|
int error = 0;
|
|
|
|
init_clone_info(&ci, md, map, bio);
|
|
|
|
if (bio->bi_opf & REQ_PREFLUSH) {
|
|
struct bio flush_bio;
|
|
|
|
/*
|
|
* Use an on-stack bio for this, it's safe since we don't
|
|
* need to reference it after submit. It's just used as
|
|
* the basis for the clone(s).
|
|
*/
|
|
bio_init(&flush_bio, NULL, 0);
|
|
flush_bio.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH | REQ_SYNC;
|
|
ci.bio = &flush_bio;
|
|
ci.sector_count = 0;
|
|
error = __send_empty_flush(&ci);
|
|
/* dec_pending submits any data associated with flush */
|
|
} else {
|
|
struct dm_target_io *tio;
|
|
|
|
ci.bio = bio;
|
|
ci.sector_count = bio_sectors(bio);
|
|
if (__process_abnormal_io(&ci, ti, &error))
|
|
goto out;
|
|
|
|
tio = alloc_tio(&ci, ti, 0, GFP_NOIO);
|
|
ret = __clone_and_map_simple_bio(&ci, tio, NULL);
|
|
}
|
|
out:
|
|
/* drop the extra reference count */
|
|
dec_pending(ci.io, errno_to_blk_status(error));
|
|
return ret;
|
|
}
|
|
|
|
static void dm_queue_split(struct mapped_device *md, struct dm_target *ti, struct bio **bio)
|
|
{
|
|
unsigned len, sector_count;
|
|
|
|
sector_count = bio_sectors(*bio);
|
|
len = min_t(sector_t, max_io_len((*bio)->bi_iter.bi_sector, ti), sector_count);
|
|
|
|
if (sector_count > len) {
|
|
struct bio *split = bio_split(*bio, len, GFP_NOIO, &md->queue->bio_split);
|
|
|
|
bio_chain(split, *bio);
|
|
trace_block_split(md->queue, split, (*bio)->bi_iter.bi_sector);
|
|
generic_make_request(*bio);
|
|
*bio = split;
|
|
}
|
|
}
|
|
|
|
static blk_qc_t dm_process_bio(struct mapped_device *md,
|
|
struct dm_table *map, struct bio *bio)
|
|
{
|
|
blk_qc_t ret = BLK_QC_T_NONE;
|
|
struct dm_target *ti = md->immutable_target;
|
|
|
|
if (unlikely(!map)) {
|
|
bio_io_error(bio);
|
|
return ret;
|
|
}
|
|
|
|
if (!ti) {
|
|
ti = dm_table_find_target(map, bio->bi_iter.bi_sector);
|
|
if (unlikely(!ti || !dm_target_is_valid(ti))) {
|
|
bio_io_error(bio);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If in ->make_request_fn we need to use blk_queue_split(), otherwise
|
|
* queue_limits for abnormal requests (e.g. discard, writesame, etc)
|
|
* won't be imposed.
|
|
*/
|
|
if (current->bio_list) {
|
|
blk_queue_split(md->queue, &bio);
|
|
if (!is_abnormal_io(bio))
|
|
dm_queue_split(md, ti, &bio);
|
|
}
|
|
|
|
if (dm_get_md_type(md) == DM_TYPE_NVME_BIO_BASED)
|
|
return __process_bio(md, map, bio, ti);
|
|
else
|
|
return __split_and_process_bio(md, map, bio);
|
|
}
|
|
|
|
static blk_qc_t dm_make_request(struct request_queue *q, struct bio *bio)
|
|
{
|
|
struct mapped_device *md = q->queuedata;
|
|
blk_qc_t ret = BLK_QC_T_NONE;
|
|
int srcu_idx;
|
|
struct dm_table *map;
|
|
|
|
map = dm_get_live_table(md, &srcu_idx);
|
|
|
|
/* if we're suspended, we have to queue this io for later */
|
|
if (unlikely(test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags))) {
|
|
dm_put_live_table(md, srcu_idx);
|
|
|
|
if (!(bio->bi_opf & REQ_RAHEAD))
|
|
queue_io(md, bio);
|
|
else
|
|
bio_io_error(bio);
|
|
return ret;
|
|
}
|
|
|
|
ret = dm_process_bio(md, map, bio);
|
|
|
|
dm_put_live_table(md, srcu_idx);
|
|
return ret;
|
|
}
|
|
|
|
static int dm_any_congested(void *congested_data, int bdi_bits)
|
|
{
|
|
int r = bdi_bits;
|
|
struct mapped_device *md = congested_data;
|
|
struct dm_table *map;
|
|
|
|
if (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
|
|
if (dm_request_based(md)) {
|
|
/*
|
|
* With request-based DM we only need to check the
|
|
* top-level queue for congestion.
|
|
*/
|
|
r = md->queue->backing_dev_info->wb.state & bdi_bits;
|
|
} else {
|
|
map = dm_get_live_table_fast(md);
|
|
if (map)
|
|
r = dm_table_any_congested(map, bdi_bits);
|
|
dm_put_live_table_fast(md);
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------
|
|
* An IDR is used to keep track of allocated minor numbers.
|
|
*---------------------------------------------------------------*/
|
|
static void free_minor(int minor)
|
|
{
|
|
spin_lock(&_minor_lock);
|
|
idr_remove(&_minor_idr, minor);
|
|
spin_unlock(&_minor_lock);
|
|
}
|
|
|
|
/*
|
|
* See if the device with a specific minor # is free.
|
|
*/
|
|
static int specific_minor(int minor)
|
|
{
|
|
int r;
|
|
|
|
if (minor >= (1 << MINORBITS))
|
|
return -EINVAL;
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock(&_minor_lock);
|
|
|
|
r = idr_alloc(&_minor_idr, MINOR_ALLOCED, minor, minor + 1, GFP_NOWAIT);
|
|
|
|
spin_unlock(&_minor_lock);
|
|
idr_preload_end();
|
|
if (r < 0)
|
|
return r == -ENOSPC ? -EBUSY : r;
|
|
return 0;
|
|
}
|
|
|
|
static int next_free_minor(int *minor)
|
|
{
|
|
int r;
|
|
|
|
idr_preload(GFP_KERNEL);
|
|
spin_lock(&_minor_lock);
|
|
|
|
r = idr_alloc(&_minor_idr, MINOR_ALLOCED, 0, 1 << MINORBITS, GFP_NOWAIT);
|
|
|
|
spin_unlock(&_minor_lock);
|
|
idr_preload_end();
|
|
if (r < 0)
|
|
return r;
|
|
*minor = r;
|
|
return 0;
|
|
}
|
|
|
|
static const struct block_device_operations dm_blk_dops;
|
|
static const struct dax_operations dm_dax_ops;
|
|
|
|
static void dm_wq_work(struct work_struct *work);
|
|
|
|
static void dm_init_normal_md_queue(struct mapped_device *md)
|
|
{
|
|
/*
|
|
* Initialize aspects of queue that aren't relevant for blk-mq
|
|
*/
|
|
md->queue->backing_dev_info->congested_fn = dm_any_congested;
|
|
}
|
|
|
|
static void cleanup_mapped_device(struct mapped_device *md)
|
|
{
|
|
if (md->wq)
|
|
destroy_workqueue(md->wq);
|
|
bioset_exit(&md->bs);
|
|
bioset_exit(&md->io_bs);
|
|
|
|
if (md->dax_dev) {
|
|
kill_dax(md->dax_dev);
|
|
put_dax(md->dax_dev);
|
|
md->dax_dev = NULL;
|
|
}
|
|
|
|
if (md->disk) {
|
|
spin_lock(&_minor_lock);
|
|
md->disk->private_data = NULL;
|
|
spin_unlock(&_minor_lock);
|
|
del_gendisk(md->disk);
|
|
put_disk(md->disk);
|
|
}
|
|
|
|
if (md->queue)
|
|
blk_cleanup_queue(md->queue);
|
|
|
|
cleanup_srcu_struct(&md->io_barrier);
|
|
|
|
if (md->bdev) {
|
|
bdput(md->bdev);
|
|
md->bdev = NULL;
|
|
}
|
|
|
|
mutex_destroy(&md->suspend_lock);
|
|
mutex_destroy(&md->type_lock);
|
|
mutex_destroy(&md->table_devices_lock);
|
|
|
|
dm_mq_cleanup_mapped_device(md);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialise a blank device with a given minor.
|
|
*/
|
|
static struct mapped_device *alloc_dev(int minor)
|
|
{
|
|
int r, numa_node_id = dm_get_numa_node();
|
|
struct mapped_device *md;
|
|
void *old_md;
|
|
|
|
md = kvzalloc_node(sizeof(*md), GFP_KERNEL, numa_node_id);
|
|
if (!md) {
|
|
DMWARN("unable to allocate device, out of memory.");
|
|
return NULL;
|
|
}
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
goto bad_module_get;
|
|
|
|
/* get a minor number for the dev */
|
|
if (minor == DM_ANY_MINOR)
|
|
r = next_free_minor(&minor);
|
|
else
|
|
r = specific_minor(minor);
|
|
if (r < 0)
|
|
goto bad_minor;
|
|
|
|
r = init_srcu_struct(&md->io_barrier);
|
|
if (r < 0)
|
|
goto bad_io_barrier;
|
|
|
|
md->numa_node_id = numa_node_id;
|
|
md->init_tio_pdu = false;
|
|
md->type = DM_TYPE_NONE;
|
|
mutex_init(&md->suspend_lock);
|
|
mutex_init(&md->type_lock);
|
|
mutex_init(&md->table_devices_lock);
|
|
spin_lock_init(&md->deferred_lock);
|
|
atomic_set(&md->holders, 1);
|
|
atomic_set(&md->open_count, 0);
|
|
atomic_set(&md->event_nr, 0);
|
|
atomic_set(&md->uevent_seq, 0);
|
|
INIT_LIST_HEAD(&md->uevent_list);
|
|
INIT_LIST_HEAD(&md->table_devices);
|
|
spin_lock_init(&md->uevent_lock);
|
|
|
|
md->queue = blk_alloc_queue_node(GFP_KERNEL, numa_node_id);
|
|
if (!md->queue)
|
|
goto bad;
|
|
md->queue->queuedata = md;
|
|
md->queue->backing_dev_info->congested_data = md;
|
|
|
|
md->disk = alloc_disk_node(1, md->numa_node_id);
|
|
if (!md->disk)
|
|
goto bad;
|
|
|
|
init_waitqueue_head(&md->wait);
|
|
INIT_WORK(&md->work, dm_wq_work);
|
|
init_waitqueue_head(&md->eventq);
|
|
init_completion(&md->kobj_holder.completion);
|
|
|
|
md->disk->major = _major;
|
|
md->disk->first_minor = minor;
|
|
md->disk->fops = &dm_blk_dops;
|
|
md->disk->queue = md->queue;
|
|
md->disk->private_data = md;
|
|
sprintf(md->disk->disk_name, "dm-%d", minor);
|
|
|
|
if (IS_ENABLED(CONFIG_DAX_DRIVER)) {
|
|
md->dax_dev = alloc_dax(md, md->disk->disk_name,
|
|
&dm_dax_ops, 0);
|
|
if (!md->dax_dev)
|
|
goto bad;
|
|
}
|
|
|
|
add_disk_no_queue_reg(md->disk);
|
|
format_dev_t(md->name, MKDEV(_major, minor));
|
|
|
|
md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
|
|
if (!md->wq)
|
|
goto bad;
|
|
|
|
md->bdev = bdget_disk(md->disk, 0);
|
|
if (!md->bdev)
|
|
goto bad;
|
|
|
|
dm_stats_init(&md->stats);
|
|
|
|
/* Populate the mapping, nobody knows we exist yet */
|
|
spin_lock(&_minor_lock);
|
|
old_md = idr_replace(&_minor_idr, md, minor);
|
|
spin_unlock(&_minor_lock);
|
|
|
|
BUG_ON(old_md != MINOR_ALLOCED);
|
|
|
|
return md;
|
|
|
|
bad:
|
|
cleanup_mapped_device(md);
|
|
bad_io_barrier:
|
|
free_minor(minor);
|
|
bad_minor:
|
|
module_put(THIS_MODULE);
|
|
bad_module_get:
|
|
kvfree(md);
|
|
return NULL;
|
|
}
|
|
|
|
static void unlock_fs(struct mapped_device *md);
|
|
|
|
static void free_dev(struct mapped_device *md)
|
|
{
|
|
int minor = MINOR(disk_devt(md->disk));
|
|
|
|
unlock_fs(md);
|
|
|
|
cleanup_mapped_device(md);
|
|
|
|
free_table_devices(&md->table_devices);
|
|
dm_stats_cleanup(&md->stats);
|
|
free_minor(minor);
|
|
|
|
module_put(THIS_MODULE);
|
|
kvfree(md);
|
|
}
|
|
|
|
static int __bind_mempools(struct mapped_device *md, struct dm_table *t)
|
|
{
|
|
struct dm_md_mempools *p = dm_table_get_md_mempools(t);
|
|
int ret = 0;
|
|
|
|
if (dm_table_bio_based(t)) {
|
|
/*
|
|
* The md may already have mempools that need changing.
|
|
* If so, reload bioset because front_pad may have changed
|
|
* because a different table was loaded.
|
|
*/
|
|
bioset_exit(&md->bs);
|
|
bioset_exit(&md->io_bs);
|
|
|
|
} else if (bioset_initialized(&md->bs)) {
|
|
/*
|
|
* There's no need to reload with request-based dm
|
|
* because the size of front_pad doesn't change.
|
|
* Note for future: If you are to reload bioset,
|
|
* prep-ed requests in the queue may refer
|
|
* to bio from the old bioset, so you must walk
|
|
* through the queue to unprep.
|
|
*/
|
|
goto out;
|
|
}
|
|
|
|
BUG_ON(!p ||
|
|
bioset_initialized(&md->bs) ||
|
|
bioset_initialized(&md->io_bs));
|
|
|
|
ret = bioset_init_from_src(&md->bs, &p->bs);
|
|
if (ret)
|
|
goto out;
|
|
ret = bioset_init_from_src(&md->io_bs, &p->io_bs);
|
|
if (ret)
|
|
bioset_exit(&md->bs);
|
|
out:
|
|
/* mempool bind completed, no longer need any mempools in the table */
|
|
dm_table_free_md_mempools(t);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Bind a table to the device.
|
|
*/
|
|
static void event_callback(void *context)
|
|
{
|
|
unsigned long flags;
|
|
LIST_HEAD(uevents);
|
|
struct mapped_device *md = (struct mapped_device *) context;
|
|
|
|
spin_lock_irqsave(&md->uevent_lock, flags);
|
|
list_splice_init(&md->uevent_list, &uevents);
|
|
spin_unlock_irqrestore(&md->uevent_lock, flags);
|
|
|
|
dm_send_uevents(&uevents, &disk_to_dev(md->disk)->kobj);
|
|
|
|
atomic_inc(&md->event_nr);
|
|
wake_up(&md->eventq);
|
|
dm_issue_global_event();
|
|
}
|
|
|
|
/*
|
|
* Protected by md->suspend_lock obtained by dm_swap_table().
|
|
*/
|
|
static void __set_size(struct mapped_device *md, sector_t size)
|
|
{
|
|
lockdep_assert_held(&md->suspend_lock);
|
|
|
|
set_capacity(md->disk, size);
|
|
|
|
i_size_write(md->bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
|
|
}
|
|
|
|
/*
|
|
* Returns old map, which caller must destroy.
|
|
*/
|
|
static struct dm_table *__bind(struct mapped_device *md, struct dm_table *t,
|
|
struct queue_limits *limits)
|
|
{
|
|
struct dm_table *old_map;
|
|
struct request_queue *q = md->queue;
|
|
bool request_based = dm_table_request_based(t);
|
|
sector_t size;
|
|
int ret;
|
|
|
|
lockdep_assert_held(&md->suspend_lock);
|
|
|
|
size = dm_table_get_size(t);
|
|
|
|
/*
|
|
* Wipe any geometry if the size of the table changed.
|
|
*/
|
|
if (size != dm_get_size(md))
|
|
memset(&md->geometry, 0, sizeof(md->geometry));
|
|
|
|
__set_size(md, size);
|
|
|
|
dm_table_event_callback(t, event_callback, md);
|
|
|
|
/*
|
|
* The queue hasn't been stopped yet, if the old table type wasn't
|
|
* for request-based during suspension. So stop it to prevent
|
|
* I/O mapping before resume.
|
|
* This must be done before setting the queue restrictions,
|
|
* because request-based dm may be run just after the setting.
|
|
*/
|
|
if (request_based)
|
|
dm_stop_queue(q);
|
|
|
|
if (request_based || md->type == DM_TYPE_NVME_BIO_BASED) {
|
|
/*
|
|
* Leverage the fact that request-based DM targets and
|
|
* NVMe bio based targets are immutable singletons
|
|
* - used to optimize both dm_request_fn and dm_mq_queue_rq;
|
|
* and __process_bio.
|
|
*/
|
|
md->immutable_target = dm_table_get_immutable_target(t);
|
|
}
|
|
|
|
ret = __bind_mempools(md, t);
|
|
if (ret) {
|
|
old_map = ERR_PTR(ret);
|
|
goto out;
|
|
}
|
|
|
|
old_map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
|
|
rcu_assign_pointer(md->map, (void *)t);
|
|
md->immutable_target_type = dm_table_get_immutable_target_type(t);
|
|
|
|
dm_table_set_restrictions(t, q, limits);
|
|
if (old_map)
|
|
dm_sync_table(md);
|
|
|
|
out:
|
|
return old_map;
|
|
}
|
|
|
|
/*
|
|
* Returns unbound table for the caller to free.
|
|
*/
|
|
static struct dm_table *__unbind(struct mapped_device *md)
|
|
{
|
|
struct dm_table *map = rcu_dereference_protected(md->map, 1);
|
|
|
|
if (!map)
|
|
return NULL;
|
|
|
|
dm_table_event_callback(map, NULL, NULL);
|
|
RCU_INIT_POINTER(md->map, NULL);
|
|
dm_sync_table(md);
|
|
|
|
return map;
|
|
}
|
|
|
|
/*
|
|
* Constructor for a new device.
|
|
*/
|
|
int dm_create(int minor, struct mapped_device **result)
|
|
{
|
|
int r;
|
|
struct mapped_device *md;
|
|
|
|
md = alloc_dev(minor);
|
|
if (!md)
|
|
return -ENXIO;
|
|
|
|
r = dm_sysfs_init(md);
|
|
if (r) {
|
|
free_dev(md);
|
|
return r;
|
|
}
|
|
|
|
*result = md;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Functions to manage md->type.
|
|
* All are required to hold md->type_lock.
|
|
*/
|
|
void dm_lock_md_type(struct mapped_device *md)
|
|
{
|
|
mutex_lock(&md->type_lock);
|
|
}
|
|
|
|
void dm_unlock_md_type(struct mapped_device *md)
|
|
{
|
|
mutex_unlock(&md->type_lock);
|
|
}
|
|
|
|
void dm_set_md_type(struct mapped_device *md, enum dm_queue_mode type)
|
|
{
|
|
BUG_ON(!mutex_is_locked(&md->type_lock));
|
|
md->type = type;
|
|
}
|
|
|
|
enum dm_queue_mode dm_get_md_type(struct mapped_device *md)
|
|
{
|
|
return md->type;
|
|
}
|
|
|
|
struct target_type *dm_get_immutable_target_type(struct mapped_device *md)
|
|
{
|
|
return md->immutable_target_type;
|
|
}
|
|
|
|
/*
|
|
* The queue_limits are only valid as long as you have a reference
|
|
* count on 'md'.
|
|
*/
|
|
struct queue_limits *dm_get_queue_limits(struct mapped_device *md)
|
|
{
|
|
BUG_ON(!atomic_read(&md->holders));
|
|
return &md->queue->limits;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_get_queue_limits);
|
|
|
|
/*
|
|
* Setup the DM device's queue based on md's type
|
|
*/
|
|
int dm_setup_md_queue(struct mapped_device *md, struct dm_table *t)
|
|
{
|
|
int r;
|
|
struct queue_limits limits;
|
|
enum dm_queue_mode type = dm_get_md_type(md);
|
|
|
|
switch (type) {
|
|
case DM_TYPE_REQUEST_BASED:
|
|
r = dm_mq_init_request_queue(md, t);
|
|
if (r) {
|
|
DMERR("Cannot initialize queue for request-based dm-mq mapped device");
|
|
return r;
|
|
}
|
|
break;
|
|
case DM_TYPE_BIO_BASED:
|
|
case DM_TYPE_DAX_BIO_BASED:
|
|
case DM_TYPE_NVME_BIO_BASED:
|
|
dm_init_normal_md_queue(md);
|
|
blk_queue_make_request(md->queue, dm_make_request);
|
|
break;
|
|
case DM_TYPE_NONE:
|
|
WARN_ON_ONCE(true);
|
|
break;
|
|
}
|
|
|
|
r = dm_calculate_queue_limits(t, &limits);
|
|
if (r) {
|
|
DMERR("Cannot calculate initial queue limits");
|
|
return r;
|
|
}
|
|
dm_table_set_restrictions(t, md->queue, &limits);
|
|
blk_register_queue(md->disk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct mapped_device *dm_get_md(dev_t dev)
|
|
{
|
|
struct mapped_device *md;
|
|
unsigned minor = MINOR(dev);
|
|
|
|
if (MAJOR(dev) != _major || minor >= (1 << MINORBITS))
|
|
return NULL;
|
|
|
|
spin_lock(&_minor_lock);
|
|
|
|
md = idr_find(&_minor_idr, minor);
|
|
if (!md || md == MINOR_ALLOCED || (MINOR(disk_devt(dm_disk(md))) != minor) ||
|
|
test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) {
|
|
md = NULL;
|
|
goto out;
|
|
}
|
|
dm_get(md);
|
|
out:
|
|
spin_unlock(&_minor_lock);
|
|
|
|
return md;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_get_md);
|
|
|
|
void *dm_get_mdptr(struct mapped_device *md)
|
|
{
|
|
return md->interface_ptr;
|
|
}
|
|
|
|
void dm_set_mdptr(struct mapped_device *md, void *ptr)
|
|
{
|
|
md->interface_ptr = ptr;
|
|
}
|
|
|
|
void dm_get(struct mapped_device *md)
|
|
{
|
|
atomic_inc(&md->holders);
|
|
BUG_ON(test_bit(DMF_FREEING, &md->flags));
|
|
}
|
|
|
|
int dm_hold(struct mapped_device *md)
|
|
{
|
|
spin_lock(&_minor_lock);
|
|
if (test_bit(DMF_FREEING, &md->flags)) {
|
|
spin_unlock(&_minor_lock);
|
|
return -EBUSY;
|
|
}
|
|
dm_get(md);
|
|
spin_unlock(&_minor_lock);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_hold);
|
|
|
|
const char *dm_device_name(struct mapped_device *md)
|
|
{
|
|
return md->name;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_device_name);
|
|
|
|
static void __dm_destroy(struct mapped_device *md, bool wait)
|
|
{
|
|
struct dm_table *map;
|
|
int srcu_idx;
|
|
|
|
might_sleep();
|
|
|
|
spin_lock(&_minor_lock);
|
|
idr_replace(&_minor_idr, MINOR_ALLOCED, MINOR(disk_devt(dm_disk(md))));
|
|
set_bit(DMF_FREEING, &md->flags);
|
|
spin_unlock(&_minor_lock);
|
|
|
|
blk_set_queue_dying(md->queue);
|
|
|
|
/*
|
|
* Take suspend_lock so that presuspend and postsuspend methods
|
|
* do not race with internal suspend.
|
|
*/
|
|
mutex_lock(&md->suspend_lock);
|
|
map = dm_get_live_table(md, &srcu_idx);
|
|
if (!dm_suspended_md(md)) {
|
|
dm_table_presuspend_targets(map);
|
|
dm_table_postsuspend_targets(map);
|
|
}
|
|
/* dm_put_live_table must be before msleep, otherwise deadlock is possible */
|
|
dm_put_live_table(md, srcu_idx);
|
|
mutex_unlock(&md->suspend_lock);
|
|
|
|
/*
|
|
* Rare, but there may be I/O requests still going to complete,
|
|
* for example. Wait for all references to disappear.
|
|
* No one should increment the reference count of the mapped_device,
|
|
* after the mapped_device state becomes DMF_FREEING.
|
|
*/
|
|
if (wait)
|
|
while (atomic_read(&md->holders))
|
|
msleep(1);
|
|
else if (atomic_read(&md->holders))
|
|
DMWARN("%s: Forcibly removing mapped_device still in use! (%d users)",
|
|
dm_device_name(md), atomic_read(&md->holders));
|
|
|
|
dm_sysfs_exit(md);
|
|
dm_table_destroy(__unbind(md));
|
|
free_dev(md);
|
|
}
|
|
|
|
void dm_destroy(struct mapped_device *md)
|
|
{
|
|
__dm_destroy(md, true);
|
|
}
|
|
|
|
void dm_destroy_immediate(struct mapped_device *md)
|
|
{
|
|
__dm_destroy(md, false);
|
|
}
|
|
|
|
void dm_put(struct mapped_device *md)
|
|
{
|
|
atomic_dec(&md->holders);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_put);
|
|
|
|
static int dm_wait_for_completion(struct mapped_device *md, long task_state)
|
|
{
|
|
int r = 0;
|
|
DEFINE_WAIT(wait);
|
|
|
|
while (1) {
|
|
prepare_to_wait(&md->wait, &wait, task_state);
|
|
|
|
if (!md_in_flight(md))
|
|
break;
|
|
|
|
if (signal_pending_state(task_state, current)) {
|
|
r = -EINTR;
|
|
break;
|
|
}
|
|
|
|
io_schedule();
|
|
}
|
|
finish_wait(&md->wait, &wait);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Process the deferred bios
|
|
*/
|
|
static void dm_wq_work(struct work_struct *work)
|
|
{
|
|
struct mapped_device *md = container_of(work, struct mapped_device,
|
|
work);
|
|
struct bio *c;
|
|
int srcu_idx;
|
|
struct dm_table *map;
|
|
|
|
map = dm_get_live_table(md, &srcu_idx);
|
|
|
|
while (!test_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags)) {
|
|
spin_lock_irq(&md->deferred_lock);
|
|
c = bio_list_pop(&md->deferred);
|
|
spin_unlock_irq(&md->deferred_lock);
|
|
|
|
if (!c)
|
|
break;
|
|
|
|
if (dm_request_based(md))
|
|
(void) generic_make_request(c);
|
|
else
|
|
(void) dm_process_bio(md, map, c);
|
|
}
|
|
|
|
dm_put_live_table(md, srcu_idx);
|
|
}
|
|
|
|
static void dm_queue_flush(struct mapped_device *md)
|
|
{
|
|
clear_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
|
|
smp_mb__after_atomic();
|
|
queue_work(md->wq, &md->work);
|
|
}
|
|
|
|
/*
|
|
* Swap in a new table, returning the old one for the caller to destroy.
|
|
*/
|
|
struct dm_table *dm_swap_table(struct mapped_device *md, struct dm_table *table)
|
|
{
|
|
struct dm_table *live_map = NULL, *map = ERR_PTR(-EINVAL);
|
|
struct queue_limits limits;
|
|
int r;
|
|
|
|
mutex_lock(&md->suspend_lock);
|
|
|
|
/* device must be suspended */
|
|
if (!dm_suspended_md(md))
|
|
goto out;
|
|
|
|
/*
|
|
* If the new table has no data devices, retain the existing limits.
|
|
* This helps multipath with queue_if_no_path if all paths disappear,
|
|
* then new I/O is queued based on these limits, and then some paths
|
|
* reappear.
|
|
*/
|
|
if (dm_table_has_no_data_devices(table)) {
|
|
live_map = dm_get_live_table_fast(md);
|
|
if (live_map)
|
|
limits = md->queue->limits;
|
|
dm_put_live_table_fast(md);
|
|
}
|
|
|
|
if (!live_map) {
|
|
r = dm_calculate_queue_limits(table, &limits);
|
|
if (r) {
|
|
map = ERR_PTR(r);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
map = __bind(md, table, &limits);
|
|
dm_issue_global_event();
|
|
|
|
out:
|
|
mutex_unlock(&md->suspend_lock);
|
|
return map;
|
|
}
|
|
|
|
/*
|
|
* Functions to lock and unlock any filesystem running on the
|
|
* device.
|
|
*/
|
|
static int lock_fs(struct mapped_device *md)
|
|
{
|
|
int r;
|
|
|
|
WARN_ON(md->frozen_sb);
|
|
|
|
md->frozen_sb = freeze_bdev(md->bdev);
|
|
if (IS_ERR(md->frozen_sb)) {
|
|
r = PTR_ERR(md->frozen_sb);
|
|
md->frozen_sb = NULL;
|
|
return r;
|
|
}
|
|
|
|
set_bit(DMF_FROZEN, &md->flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void unlock_fs(struct mapped_device *md)
|
|
{
|
|
if (!test_bit(DMF_FROZEN, &md->flags))
|
|
return;
|
|
|
|
thaw_bdev(md->bdev, md->frozen_sb);
|
|
md->frozen_sb = NULL;
|
|
clear_bit(DMF_FROZEN, &md->flags);
|
|
}
|
|
|
|
/*
|
|
* @suspend_flags: DM_SUSPEND_LOCKFS_FLAG and/or DM_SUSPEND_NOFLUSH_FLAG
|
|
* @task_state: e.g. TASK_INTERRUPTIBLE or TASK_UNINTERRUPTIBLE
|
|
* @dmf_suspended_flag: DMF_SUSPENDED or DMF_SUSPENDED_INTERNALLY
|
|
*
|
|
* If __dm_suspend returns 0, the device is completely quiescent
|
|
* now. There is no request-processing activity. All new requests
|
|
* are being added to md->deferred list.
|
|
*/
|
|
static int __dm_suspend(struct mapped_device *md, struct dm_table *map,
|
|
unsigned suspend_flags, long task_state,
|
|
int dmf_suspended_flag)
|
|
{
|
|
bool do_lockfs = suspend_flags & DM_SUSPEND_LOCKFS_FLAG;
|
|
bool noflush = suspend_flags & DM_SUSPEND_NOFLUSH_FLAG;
|
|
int r;
|
|
|
|
lockdep_assert_held(&md->suspend_lock);
|
|
|
|
/*
|
|
* DMF_NOFLUSH_SUSPENDING must be set before presuspend.
|
|
* This flag is cleared before dm_suspend returns.
|
|
*/
|
|
if (noflush)
|
|
set_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
|
|
else
|
|
pr_debug("%s: suspending with flush\n", dm_device_name(md));
|
|
|
|
/*
|
|
* This gets reverted if there's an error later and the targets
|
|
* provide the .presuspend_undo hook.
|
|
*/
|
|
dm_table_presuspend_targets(map);
|
|
|
|
/*
|
|
* Flush I/O to the device.
|
|
* Any I/O submitted after lock_fs() may not be flushed.
|
|
* noflush takes precedence over do_lockfs.
|
|
* (lock_fs() flushes I/Os and waits for them to complete.)
|
|
*/
|
|
if (!noflush && do_lockfs) {
|
|
r = lock_fs(md);
|
|
if (r) {
|
|
dm_table_presuspend_undo_targets(map);
|
|
return r;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Here we must make sure that no processes are submitting requests
|
|
* to target drivers i.e. no one may be executing
|
|
* __split_and_process_bio. This is called from dm_request and
|
|
* dm_wq_work.
|
|
*
|
|
* To get all processes out of __split_and_process_bio in dm_request,
|
|
* we take the write lock. To prevent any process from reentering
|
|
* __split_and_process_bio from dm_request and quiesce the thread
|
|
* (dm_wq_work), we set BMF_BLOCK_IO_FOR_SUSPEND and call
|
|
* flush_workqueue(md->wq).
|
|
*/
|
|
set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
|
|
if (map)
|
|
synchronize_srcu(&md->io_barrier);
|
|
|
|
/*
|
|
* Stop md->queue before flushing md->wq in case request-based
|
|
* dm defers requests to md->wq from md->queue.
|
|
*/
|
|
if (dm_request_based(md))
|
|
dm_stop_queue(md->queue);
|
|
|
|
flush_workqueue(md->wq);
|
|
|
|
/*
|
|
* At this point no more requests are entering target request routines.
|
|
* We call dm_wait_for_completion to wait for all existing requests
|
|
* to finish.
|
|
*/
|
|
r = dm_wait_for_completion(md, task_state);
|
|
if (!r)
|
|
set_bit(dmf_suspended_flag, &md->flags);
|
|
|
|
if (noflush)
|
|
clear_bit(DMF_NOFLUSH_SUSPENDING, &md->flags);
|
|
if (map)
|
|
synchronize_srcu(&md->io_barrier);
|
|
|
|
/* were we interrupted ? */
|
|
if (r < 0) {
|
|
dm_queue_flush(md);
|
|
|
|
if (dm_request_based(md))
|
|
dm_start_queue(md->queue);
|
|
|
|
unlock_fs(md);
|
|
dm_table_presuspend_undo_targets(map);
|
|
/* pushback list is already flushed, so skip flush */
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* We need to be able to change a mapping table under a mounted
|
|
* filesystem. For example we might want to move some data in
|
|
* the background. Before the table can be swapped with
|
|
* dm_bind_table, dm_suspend must be called to flush any in
|
|
* flight bios and ensure that any further io gets deferred.
|
|
*/
|
|
/*
|
|
* Suspend mechanism in request-based dm.
|
|
*
|
|
* 1. Flush all I/Os by lock_fs() if needed.
|
|
* 2. Stop dispatching any I/O by stopping the request_queue.
|
|
* 3. Wait for all in-flight I/Os to be completed or requeued.
|
|
*
|
|
* To abort suspend, start the request_queue.
|
|
*/
|
|
int dm_suspend(struct mapped_device *md, unsigned suspend_flags)
|
|
{
|
|
struct dm_table *map = NULL;
|
|
int r = 0;
|
|
|
|
retry:
|
|
mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING);
|
|
|
|
if (dm_suspended_md(md)) {
|
|
r = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (dm_suspended_internally_md(md)) {
|
|
/* already internally suspended, wait for internal resume */
|
|
mutex_unlock(&md->suspend_lock);
|
|
r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE);
|
|
if (r)
|
|
return r;
|
|
goto retry;
|
|
}
|
|
|
|
map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
|
|
|
|
r = __dm_suspend(md, map, suspend_flags, TASK_INTERRUPTIBLE, DMF_SUSPENDED);
|
|
if (r)
|
|
goto out_unlock;
|
|
|
|
dm_table_postsuspend_targets(map);
|
|
|
|
out_unlock:
|
|
mutex_unlock(&md->suspend_lock);
|
|
return r;
|
|
}
|
|
|
|
static int __dm_resume(struct mapped_device *md, struct dm_table *map)
|
|
{
|
|
if (map) {
|
|
int r = dm_table_resume_targets(map);
|
|
if (r)
|
|
return r;
|
|
}
|
|
|
|
dm_queue_flush(md);
|
|
|
|
/*
|
|
* Flushing deferred I/Os must be done after targets are resumed
|
|
* so that mapping of targets can work correctly.
|
|
* Request-based dm is queueing the deferred I/Os in its request_queue.
|
|
*/
|
|
if (dm_request_based(md))
|
|
dm_start_queue(md->queue);
|
|
|
|
unlock_fs(md);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int dm_resume(struct mapped_device *md)
|
|
{
|
|
int r;
|
|
struct dm_table *map = NULL;
|
|
|
|
retry:
|
|
r = -EINVAL;
|
|
mutex_lock_nested(&md->suspend_lock, SINGLE_DEPTH_NESTING);
|
|
|
|
if (!dm_suspended_md(md))
|
|
goto out;
|
|
|
|
if (dm_suspended_internally_md(md)) {
|
|
/* already internally suspended, wait for internal resume */
|
|
mutex_unlock(&md->suspend_lock);
|
|
r = wait_on_bit(&md->flags, DMF_SUSPENDED_INTERNALLY, TASK_INTERRUPTIBLE);
|
|
if (r)
|
|
return r;
|
|
goto retry;
|
|
}
|
|
|
|
map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
|
|
if (!map || !dm_table_get_size(map))
|
|
goto out;
|
|
|
|
r = __dm_resume(md, map);
|
|
if (r)
|
|
goto out;
|
|
|
|
clear_bit(DMF_SUSPENDED, &md->flags);
|
|
out:
|
|
mutex_unlock(&md->suspend_lock);
|
|
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Internal suspend/resume works like userspace-driven suspend. It waits
|
|
* until all bios finish and prevents issuing new bios to the target drivers.
|
|
* It may be used only from the kernel.
|
|
*/
|
|
|
|
static void __dm_internal_suspend(struct mapped_device *md, unsigned suspend_flags)
|
|
{
|
|
struct dm_table *map = NULL;
|
|
|
|
lockdep_assert_held(&md->suspend_lock);
|
|
|
|
if (md->internal_suspend_count++)
|
|
return; /* nested internal suspend */
|
|
|
|
if (dm_suspended_md(md)) {
|
|
set_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
|
|
return; /* nest suspend */
|
|
}
|
|
|
|
map = rcu_dereference_protected(md->map, lockdep_is_held(&md->suspend_lock));
|
|
|
|
/*
|
|
* Using TASK_UNINTERRUPTIBLE because only NOFLUSH internal suspend is
|
|
* supported. Properly supporting a TASK_INTERRUPTIBLE internal suspend
|
|
* would require changing .presuspend to return an error -- avoid this
|
|
* until there is a need for more elaborate variants of internal suspend.
|
|
*/
|
|
(void) __dm_suspend(md, map, suspend_flags, TASK_UNINTERRUPTIBLE,
|
|
DMF_SUSPENDED_INTERNALLY);
|
|
|
|
dm_table_postsuspend_targets(map);
|
|
}
|
|
|
|
static void __dm_internal_resume(struct mapped_device *md)
|
|
{
|
|
BUG_ON(!md->internal_suspend_count);
|
|
|
|
if (--md->internal_suspend_count)
|
|
return; /* resume from nested internal suspend */
|
|
|
|
if (dm_suspended_md(md))
|
|
goto done; /* resume from nested suspend */
|
|
|
|
/*
|
|
* NOTE: existing callers don't need to call dm_table_resume_targets
|
|
* (which may fail -- so best to avoid it for now by passing NULL map)
|
|
*/
|
|
(void) __dm_resume(md, NULL);
|
|
|
|
done:
|
|
clear_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
|
|
smp_mb__after_atomic();
|
|
wake_up_bit(&md->flags, DMF_SUSPENDED_INTERNALLY);
|
|
}
|
|
|
|
void dm_internal_suspend_noflush(struct mapped_device *md)
|
|
{
|
|
mutex_lock(&md->suspend_lock);
|
|
__dm_internal_suspend(md, DM_SUSPEND_NOFLUSH_FLAG);
|
|
mutex_unlock(&md->suspend_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_internal_suspend_noflush);
|
|
|
|
void dm_internal_resume(struct mapped_device *md)
|
|
{
|
|
mutex_lock(&md->suspend_lock);
|
|
__dm_internal_resume(md);
|
|
mutex_unlock(&md->suspend_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_internal_resume);
|
|
|
|
/*
|
|
* Fast variants of internal suspend/resume hold md->suspend_lock,
|
|
* which prevents interaction with userspace-driven suspend.
|
|
*/
|
|
|
|
void dm_internal_suspend_fast(struct mapped_device *md)
|
|
{
|
|
mutex_lock(&md->suspend_lock);
|
|
if (dm_suspended_md(md) || dm_suspended_internally_md(md))
|
|
return;
|
|
|
|
set_bit(DMF_BLOCK_IO_FOR_SUSPEND, &md->flags);
|
|
synchronize_srcu(&md->io_barrier);
|
|
flush_workqueue(md->wq);
|
|
dm_wait_for_completion(md, TASK_UNINTERRUPTIBLE);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_internal_suspend_fast);
|
|
|
|
void dm_internal_resume_fast(struct mapped_device *md)
|
|
{
|
|
if (dm_suspended_md(md) || dm_suspended_internally_md(md))
|
|
goto done;
|
|
|
|
dm_queue_flush(md);
|
|
|
|
done:
|
|
mutex_unlock(&md->suspend_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_internal_resume_fast);
|
|
|
|
/*-----------------------------------------------------------------
|
|
* Event notification.
|
|
*---------------------------------------------------------------*/
|
|
int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
|
|
unsigned cookie)
|
|
{
|
|
char udev_cookie[DM_COOKIE_LENGTH];
|
|
char *envp[] = { udev_cookie, NULL };
|
|
|
|
if (!cookie)
|
|
return kobject_uevent(&disk_to_dev(md->disk)->kobj, action);
|
|
else {
|
|
snprintf(udev_cookie, DM_COOKIE_LENGTH, "%s=%u",
|
|
DM_COOKIE_ENV_VAR_NAME, cookie);
|
|
return kobject_uevent_env(&disk_to_dev(md->disk)->kobj,
|
|
action, envp);
|
|
}
|
|
}
|
|
|
|
uint32_t dm_next_uevent_seq(struct mapped_device *md)
|
|
{
|
|
return atomic_add_return(1, &md->uevent_seq);
|
|
}
|
|
|
|
uint32_t dm_get_event_nr(struct mapped_device *md)
|
|
{
|
|
return atomic_read(&md->event_nr);
|
|
}
|
|
|
|
int dm_wait_event(struct mapped_device *md, int event_nr)
|
|
{
|
|
return wait_event_interruptible(md->eventq,
|
|
(event_nr != atomic_read(&md->event_nr)));
|
|
}
|
|
|
|
void dm_uevent_add(struct mapped_device *md, struct list_head *elist)
|
|
{
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&md->uevent_lock, flags);
|
|
list_add(elist, &md->uevent_list);
|
|
spin_unlock_irqrestore(&md->uevent_lock, flags);
|
|
}
|
|
|
|
/*
|
|
* The gendisk is only valid as long as you have a reference
|
|
* count on 'md'.
|
|
*/
|
|
struct gendisk *dm_disk(struct mapped_device *md)
|
|
{
|
|
return md->disk;
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_disk);
|
|
|
|
struct kobject *dm_kobject(struct mapped_device *md)
|
|
{
|
|
return &md->kobj_holder.kobj;
|
|
}
|
|
|
|
struct mapped_device *dm_get_from_kobject(struct kobject *kobj)
|
|
{
|
|
struct mapped_device *md;
|
|
|
|
md = container_of(kobj, struct mapped_device, kobj_holder.kobj);
|
|
|
|
spin_lock(&_minor_lock);
|
|
if (test_bit(DMF_FREEING, &md->flags) || dm_deleting_md(md)) {
|
|
md = NULL;
|
|
goto out;
|
|
}
|
|
dm_get(md);
|
|
out:
|
|
spin_unlock(&_minor_lock);
|
|
|
|
return md;
|
|
}
|
|
|
|
int dm_suspended_md(struct mapped_device *md)
|
|
{
|
|
return test_bit(DMF_SUSPENDED, &md->flags);
|
|
}
|
|
|
|
int dm_suspended_internally_md(struct mapped_device *md)
|
|
{
|
|
return test_bit(DMF_SUSPENDED_INTERNALLY, &md->flags);
|
|
}
|
|
|
|
int dm_test_deferred_remove_flag(struct mapped_device *md)
|
|
{
|
|
return test_bit(DMF_DEFERRED_REMOVE, &md->flags);
|
|
}
|
|
|
|
int dm_suspended(struct dm_target *ti)
|
|
{
|
|
return dm_suspended_md(dm_table_get_md(ti->table));
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_suspended);
|
|
|
|
int dm_noflush_suspending(struct dm_target *ti)
|
|
{
|
|
return __noflush_suspending(dm_table_get_md(ti->table));
|
|
}
|
|
EXPORT_SYMBOL_GPL(dm_noflush_suspending);
|
|
|
|
struct dm_md_mempools *dm_alloc_md_mempools(struct mapped_device *md, enum dm_queue_mode type,
|
|
unsigned integrity, unsigned per_io_data_size,
|
|
unsigned min_pool_size)
|
|
{
|
|
struct dm_md_mempools *pools = kzalloc_node(sizeof(*pools), GFP_KERNEL, md->numa_node_id);
|
|
unsigned int pool_size = 0;
|
|
unsigned int front_pad, io_front_pad;
|
|
int ret;
|
|
|
|
if (!pools)
|
|
return NULL;
|
|
|
|
switch (type) {
|
|
case DM_TYPE_BIO_BASED:
|
|
case DM_TYPE_DAX_BIO_BASED:
|
|
case DM_TYPE_NVME_BIO_BASED:
|
|
pool_size = max(dm_get_reserved_bio_based_ios(), min_pool_size);
|
|
front_pad = roundup(per_io_data_size, __alignof__(struct dm_target_io)) + offsetof(struct dm_target_io, clone);
|
|
io_front_pad = roundup(front_pad, __alignof__(struct dm_io)) + offsetof(struct dm_io, tio);
|
|
ret = bioset_init(&pools->io_bs, pool_size, io_front_pad, 0);
|
|
if (ret)
|
|
goto out;
|
|
if (integrity && bioset_integrity_create(&pools->io_bs, pool_size))
|
|
goto out;
|
|
break;
|
|
case DM_TYPE_REQUEST_BASED:
|
|
pool_size = max(dm_get_reserved_rq_based_ios(), min_pool_size);
|
|
front_pad = offsetof(struct dm_rq_clone_bio_info, clone);
|
|
/* per_io_data_size is used for blk-mq pdu at queue allocation */
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
ret = bioset_init(&pools->bs, pool_size, front_pad, 0);
|
|
if (ret)
|
|
goto out;
|
|
|
|
if (integrity && bioset_integrity_create(&pools->bs, pool_size))
|
|
goto out;
|
|
|
|
return pools;
|
|
|
|
out:
|
|
dm_free_md_mempools(pools);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void dm_free_md_mempools(struct dm_md_mempools *pools)
|
|
{
|
|
if (!pools)
|
|
return;
|
|
|
|
bioset_exit(&pools->bs);
|
|
bioset_exit(&pools->io_bs);
|
|
|
|
kfree(pools);
|
|
}
|
|
|
|
struct dm_pr {
|
|
u64 old_key;
|
|
u64 new_key;
|
|
u32 flags;
|
|
bool fail_early;
|
|
};
|
|
|
|
static int dm_call_pr(struct block_device *bdev, iterate_devices_callout_fn fn,
|
|
void *data)
|
|
{
|
|
struct mapped_device *md = bdev->bd_disk->private_data;
|
|
struct dm_table *table;
|
|
struct dm_target *ti;
|
|
int ret = -ENOTTY, srcu_idx;
|
|
|
|
table = dm_get_live_table(md, &srcu_idx);
|
|
if (!table || !dm_table_get_size(table))
|
|
goto out;
|
|
|
|
/* We only support devices that have a single target */
|
|
if (dm_table_get_num_targets(table) != 1)
|
|
goto out;
|
|
ti = dm_table_get_target(table, 0);
|
|
|
|
ret = -EINVAL;
|
|
if (!ti->type->iterate_devices)
|
|
goto out;
|
|
|
|
ret = ti->type->iterate_devices(ti, fn, data);
|
|
out:
|
|
dm_put_live_table(md, srcu_idx);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* For register / unregister we need to manually call out to every path.
|
|
*/
|
|
static int __dm_pr_register(struct dm_target *ti, struct dm_dev *dev,
|
|
sector_t start, sector_t len, void *data)
|
|
{
|
|
struct dm_pr *pr = data;
|
|
const struct pr_ops *ops = dev->bdev->bd_disk->fops->pr_ops;
|
|
|
|
if (!ops || !ops->pr_register)
|
|
return -EOPNOTSUPP;
|
|
return ops->pr_register(dev->bdev, pr->old_key, pr->new_key, pr->flags);
|
|
}
|
|
|
|
static int dm_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
|
|
u32 flags)
|
|
{
|
|
struct dm_pr pr = {
|
|
.old_key = old_key,
|
|
.new_key = new_key,
|
|
.flags = flags,
|
|
.fail_early = true,
|
|
};
|
|
int ret;
|
|
|
|
ret = dm_call_pr(bdev, __dm_pr_register, &pr);
|
|
if (ret && new_key) {
|
|
/* unregister all paths if we failed to register any path */
|
|
pr.old_key = new_key;
|
|
pr.new_key = 0;
|
|
pr.flags = 0;
|
|
pr.fail_early = false;
|
|
dm_call_pr(bdev, __dm_pr_register, &pr);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int dm_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
|
|
u32 flags)
|
|
{
|
|
struct mapped_device *md = bdev->bd_disk->private_data;
|
|
const struct pr_ops *ops;
|
|
int r, srcu_idx;
|
|
|
|
r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
ops = bdev->bd_disk->fops->pr_ops;
|
|
if (ops && ops->pr_reserve)
|
|
r = ops->pr_reserve(bdev, key, type, flags);
|
|
else
|
|
r = -EOPNOTSUPP;
|
|
out:
|
|
dm_unprepare_ioctl(md, srcu_idx);
|
|
return r;
|
|
}
|
|
|
|
static int dm_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
|
|
{
|
|
struct mapped_device *md = bdev->bd_disk->private_data;
|
|
const struct pr_ops *ops;
|
|
int r, srcu_idx;
|
|
|
|
r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
ops = bdev->bd_disk->fops->pr_ops;
|
|
if (ops && ops->pr_release)
|
|
r = ops->pr_release(bdev, key, type);
|
|
else
|
|
r = -EOPNOTSUPP;
|
|
out:
|
|
dm_unprepare_ioctl(md, srcu_idx);
|
|
return r;
|
|
}
|
|
|
|
static int dm_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
|
|
enum pr_type type, bool abort)
|
|
{
|
|
struct mapped_device *md = bdev->bd_disk->private_data;
|
|
const struct pr_ops *ops;
|
|
int r, srcu_idx;
|
|
|
|
r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
ops = bdev->bd_disk->fops->pr_ops;
|
|
if (ops && ops->pr_preempt)
|
|
r = ops->pr_preempt(bdev, old_key, new_key, type, abort);
|
|
else
|
|
r = -EOPNOTSUPP;
|
|
out:
|
|
dm_unprepare_ioctl(md, srcu_idx);
|
|
return r;
|
|
}
|
|
|
|
static int dm_pr_clear(struct block_device *bdev, u64 key)
|
|
{
|
|
struct mapped_device *md = bdev->bd_disk->private_data;
|
|
const struct pr_ops *ops;
|
|
int r, srcu_idx;
|
|
|
|
r = dm_prepare_ioctl(md, &srcu_idx, &bdev);
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
ops = bdev->bd_disk->fops->pr_ops;
|
|
if (ops && ops->pr_clear)
|
|
r = ops->pr_clear(bdev, key);
|
|
else
|
|
r = -EOPNOTSUPP;
|
|
out:
|
|
dm_unprepare_ioctl(md, srcu_idx);
|
|
return r;
|
|
}
|
|
|
|
static const struct pr_ops dm_pr_ops = {
|
|
.pr_register = dm_pr_register,
|
|
.pr_reserve = dm_pr_reserve,
|
|
.pr_release = dm_pr_release,
|
|
.pr_preempt = dm_pr_preempt,
|
|
.pr_clear = dm_pr_clear,
|
|
};
|
|
|
|
static const struct block_device_operations dm_blk_dops = {
|
|
.open = dm_blk_open,
|
|
.release = dm_blk_close,
|
|
.ioctl = dm_blk_ioctl,
|
|
.getgeo = dm_blk_getgeo,
|
|
.report_zones = dm_blk_report_zones,
|
|
.pr_ops = &dm_pr_ops,
|
|
.owner = THIS_MODULE
|
|
};
|
|
|
|
static const struct dax_operations dm_dax_ops = {
|
|
.direct_access = dm_dax_direct_access,
|
|
.dax_supported = dm_dax_supported,
|
|
.copy_from_iter = dm_dax_copy_from_iter,
|
|
.copy_to_iter = dm_dax_copy_to_iter,
|
|
};
|
|
|
|
/*
|
|
* module hooks
|
|
*/
|
|
module_init(dm_init);
|
|
module_exit(dm_exit);
|
|
|
|
module_param(major, uint, 0);
|
|
MODULE_PARM_DESC(major, "The major number of the device mapper");
|
|
|
|
module_param(reserved_bio_based_ios, uint, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(reserved_bio_based_ios, "Reserved IOs in bio-based mempools");
|
|
|
|
module_param(dm_numa_node, int, S_IRUGO | S_IWUSR);
|
|
MODULE_PARM_DESC(dm_numa_node, "NUMA node for DM device memory allocations");
|
|
|
|
MODULE_DESCRIPTION(DM_NAME " driver");
|
|
MODULE_AUTHOR("Joe Thornber <dm-devel@redhat.com>");
|
|
MODULE_LICENSE("GPL");
|