![Omar Sandoval](/assets/img/avatar_default.png)
Klaus Kusche reported that the I/O busy time in /proc/diskstats was not
updating properly on 4.18. This is because we started using ktime to
track elapsed time, and we convert nanoseconds to jiffies when we update
the partition counter. However, this gets rounded down, so any I/Os that
take less than a jiffy are not accounted for. Previously in this case,
the value of jiffies would sometimes increment while we were doing I/O,
so at least some I/Os were accounted for.
Let's convert the stats to use nanoseconds internally. We still report
milliseconds as before, now more accurately than ever. The value is
still truncated to 32 bits for backwards compatibility.
Fixes: 522a777566
("block: consolidate struct request timestamp fields")
Cc: stable@vger.kernel.org
Reported-by: Klaus Kusche <klaus.kusche@computerix.info>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
763 lines
23 KiB
C
763 lines
23 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_GENHD_H
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#define _LINUX_GENHD_H
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/*
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* genhd.h Copyright (C) 1992 Drew Eckhardt
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* Generic hard disk header file by
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* Drew Eckhardt
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*
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* <drew@colorado.edu>
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*/
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#include <linux/types.h>
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#include <linux/kdev_t.h>
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#include <linux/rcupdate.h>
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#include <linux/slab.h>
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#include <linux/percpu-refcount.h>
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#include <linux/uuid.h>
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#include <linux/blk_types.h>
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#ifdef CONFIG_BLOCK
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#define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev)
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#define dev_to_part(device) container_of((device), struct hd_struct, __dev)
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#define disk_to_dev(disk) (&(disk)->part0.__dev)
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#define part_to_dev(part) (&((part)->__dev))
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extern struct device_type part_type;
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extern struct kobject *block_depr;
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extern struct class block_class;
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enum {
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/* These three have identical behaviour; use the second one if DOS FDISK gets
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confused about extended/logical partitions starting past cylinder 1023. */
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DOS_EXTENDED_PARTITION = 5,
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LINUX_EXTENDED_PARTITION = 0x85,
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WIN98_EXTENDED_PARTITION = 0x0f,
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SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION,
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LINUX_SWAP_PARTITION = 0x82,
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LINUX_DATA_PARTITION = 0x83,
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LINUX_LVM_PARTITION = 0x8e,
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LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */
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SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION,
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NEW_SOLARIS_X86_PARTITION = 0xbf,
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DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */
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DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */
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DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */
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EZD_PARTITION = 0x55, /* EZ-DRIVE */
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FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */
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OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */
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NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */
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BSDI_PARTITION = 0xb7, /* BSDI Partition ID */
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MINIX_PARTITION = 0x81, /* Minix Partition ID */
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UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */
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};
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#define DISK_MAX_PARTS 256
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#define DISK_NAME_LEN 32
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#include <linux/major.h>
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#include <linux/device.h>
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#include <linux/smp.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/workqueue.h>
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struct partition {
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unsigned char boot_ind; /* 0x80 - active */
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unsigned char head; /* starting head */
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unsigned char sector; /* starting sector */
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unsigned char cyl; /* starting cylinder */
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unsigned char sys_ind; /* What partition type */
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unsigned char end_head; /* end head */
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unsigned char end_sector; /* end sector */
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unsigned char end_cyl; /* end cylinder */
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__le32 start_sect; /* starting sector counting from 0 */
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__le32 nr_sects; /* nr of sectors in partition */
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} __attribute__((packed));
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struct disk_stats {
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u64 nsecs[NR_STAT_GROUPS];
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unsigned long sectors[NR_STAT_GROUPS];
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unsigned long ios[NR_STAT_GROUPS];
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unsigned long merges[NR_STAT_GROUPS];
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unsigned long io_ticks;
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unsigned long time_in_queue;
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};
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#define PARTITION_META_INFO_VOLNAMELTH 64
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/*
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* Enough for the string representation of any kind of UUID plus NULL.
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* EFI UUID is 36 characters. MSDOS UUID is 11 characters.
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*/
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#define PARTITION_META_INFO_UUIDLTH (UUID_STRING_LEN + 1)
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struct partition_meta_info {
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char uuid[PARTITION_META_INFO_UUIDLTH];
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u8 volname[PARTITION_META_INFO_VOLNAMELTH];
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};
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struct hd_struct {
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sector_t start_sect;
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/*
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* nr_sects is protected by sequence counter. One might extend a
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* partition while IO is happening to it and update of nr_sects
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* can be non-atomic on 32bit machines with 64bit sector_t.
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*/
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sector_t nr_sects;
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seqcount_t nr_sects_seq;
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sector_t alignment_offset;
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unsigned int discard_alignment;
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struct device __dev;
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struct kobject *holder_dir;
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int policy, partno;
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struct partition_meta_info *info;
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#ifdef CONFIG_FAIL_MAKE_REQUEST
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int make_it_fail;
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#endif
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unsigned long stamp;
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atomic_t in_flight[2];
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#ifdef CONFIG_SMP
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struct disk_stats __percpu *dkstats;
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#else
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struct disk_stats dkstats;
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#endif
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struct percpu_ref ref;
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struct rcu_head rcu_head;
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};
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#define GENHD_FL_REMOVABLE 1
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/* 2 is unused */
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#define GENHD_FL_MEDIA_CHANGE_NOTIFY 4
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#define GENHD_FL_CD 8
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#define GENHD_FL_UP 16
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#define GENHD_FL_SUPPRESS_PARTITION_INFO 32
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#define GENHD_FL_EXT_DEVT 64 /* allow extended devt */
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#define GENHD_FL_NATIVE_CAPACITY 128
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#define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256
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#define GENHD_FL_NO_PART_SCAN 512
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#define GENHD_FL_HIDDEN 1024
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enum {
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DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */
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DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */
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};
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struct disk_part_tbl {
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struct rcu_head rcu_head;
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int len;
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struct hd_struct __rcu *last_lookup;
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struct hd_struct __rcu *part[];
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};
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struct disk_events;
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struct badblocks;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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struct blk_integrity {
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const struct blk_integrity_profile *profile;
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unsigned char flags;
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unsigned char tuple_size;
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unsigned char interval_exp;
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unsigned char tag_size;
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};
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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struct gendisk {
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/* major, first_minor and minors are input parameters only,
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* don't use directly. Use disk_devt() and disk_max_parts().
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*/
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int major; /* major number of driver */
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int first_minor;
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int minors; /* maximum number of minors, =1 for
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* disks that can't be partitioned. */
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char disk_name[DISK_NAME_LEN]; /* name of major driver */
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char *(*devnode)(struct gendisk *gd, umode_t *mode);
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unsigned int events; /* supported events */
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unsigned int async_events; /* async events, subset of all */
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/* Array of pointers to partitions indexed by partno.
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* Protected with matching bdev lock but stat and other
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* non-critical accesses use RCU. Always access through
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* helpers.
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*/
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struct disk_part_tbl __rcu *part_tbl;
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struct hd_struct part0;
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const struct block_device_operations *fops;
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struct request_queue *queue;
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void *private_data;
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int flags;
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struct rw_semaphore lookup_sem;
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struct kobject *slave_dir;
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struct timer_rand_state *random;
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atomic_t sync_io; /* RAID */
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struct disk_events *ev;
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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struct kobject integrity_kobj;
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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int node_id;
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struct badblocks *bb;
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struct lockdep_map lockdep_map;
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};
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static inline struct gendisk *part_to_disk(struct hd_struct *part)
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{
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if (likely(part)) {
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if (part->partno)
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return dev_to_disk(part_to_dev(part)->parent);
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else
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return dev_to_disk(part_to_dev(part));
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}
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return NULL;
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}
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static inline int disk_max_parts(struct gendisk *disk)
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{
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if (disk->flags & GENHD_FL_EXT_DEVT)
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return DISK_MAX_PARTS;
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return disk->minors;
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}
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static inline bool disk_part_scan_enabled(struct gendisk *disk)
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{
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return disk_max_parts(disk) > 1 &&
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!(disk->flags & GENHD_FL_NO_PART_SCAN);
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}
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static inline dev_t disk_devt(struct gendisk *disk)
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{
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return MKDEV(disk->major, disk->first_minor);
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}
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static inline dev_t part_devt(struct hd_struct *part)
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{
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return part_to_dev(part)->devt;
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}
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extern struct hd_struct *__disk_get_part(struct gendisk *disk, int partno);
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extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno);
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static inline void disk_put_part(struct hd_struct *part)
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{
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if (likely(part))
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put_device(part_to_dev(part));
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}
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/*
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* Smarter partition iterator without context limits.
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*/
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#define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */
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#define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */
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#define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */
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#define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */
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struct disk_part_iter {
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struct gendisk *disk;
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struct hd_struct *part;
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int idx;
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unsigned int flags;
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};
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extern void disk_part_iter_init(struct disk_part_iter *piter,
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struct gendisk *disk, unsigned int flags);
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extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter);
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extern void disk_part_iter_exit(struct disk_part_iter *piter);
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extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk,
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sector_t sector);
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/*
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* Macros to operate on percpu disk statistics:
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*
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* {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters
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* and should be called between disk_stat_lock() and
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* disk_stat_unlock().
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*
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* part_stat_read() can be called at any time.
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*
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* part_stat_{add|set_all}() and {init|free}_part_stats are for
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* internal use only.
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*/
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#ifdef CONFIG_SMP
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#define part_stat_lock() ({ rcu_read_lock(); get_cpu(); })
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#define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0)
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#define __part_stat_add(cpu, part, field, addnd) \
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(per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd))
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#define part_stat_read(part, field) \
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({ \
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typeof((part)->dkstats->field) res = 0; \
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unsigned int _cpu; \
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for_each_possible_cpu(_cpu) \
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res += per_cpu_ptr((part)->dkstats, _cpu)->field; \
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res; \
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})
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static inline void part_stat_set_all(struct hd_struct *part, int value)
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{
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int i;
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for_each_possible_cpu(i)
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memset(per_cpu_ptr(part->dkstats, i), value,
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sizeof(struct disk_stats));
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}
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static inline int init_part_stats(struct hd_struct *part)
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{
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part->dkstats = alloc_percpu(struct disk_stats);
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if (!part->dkstats)
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return 0;
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return 1;
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}
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static inline void free_part_stats(struct hd_struct *part)
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{
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free_percpu(part->dkstats);
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}
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#else /* !CONFIG_SMP */
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#define part_stat_lock() ({ rcu_read_lock(); 0; })
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#define part_stat_unlock() rcu_read_unlock()
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#define __part_stat_add(cpu, part, field, addnd) \
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((part)->dkstats.field += addnd)
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#define part_stat_read(part, field) ((part)->dkstats.field)
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static inline void part_stat_set_all(struct hd_struct *part, int value)
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{
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memset(&part->dkstats, value, sizeof(struct disk_stats));
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}
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static inline int init_part_stats(struct hd_struct *part)
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{
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return 1;
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}
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static inline void free_part_stats(struct hd_struct *part)
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{
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}
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#endif /* CONFIG_SMP */
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#define part_stat_read_msecs(part, which) \
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div_u64(part_stat_read(part, nsecs[which]), NSEC_PER_MSEC)
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#define part_stat_read_accum(part, field) \
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(part_stat_read(part, field[STAT_READ]) + \
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part_stat_read(part, field[STAT_WRITE]) + \
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part_stat_read(part, field[STAT_DISCARD]))
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#define part_stat_add(cpu, part, field, addnd) do { \
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__part_stat_add((cpu), (part), field, addnd); \
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if ((part)->partno) \
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__part_stat_add((cpu), &part_to_disk((part))->part0, \
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field, addnd); \
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} while (0)
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#define part_stat_dec(cpu, gendiskp, field) \
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part_stat_add(cpu, gendiskp, field, -1)
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#define part_stat_inc(cpu, gendiskp, field) \
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part_stat_add(cpu, gendiskp, field, 1)
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#define part_stat_sub(cpu, gendiskp, field, subnd) \
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part_stat_add(cpu, gendiskp, field, -subnd)
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void part_in_flight(struct request_queue *q, struct hd_struct *part,
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unsigned int inflight[2]);
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void part_in_flight_rw(struct request_queue *q, struct hd_struct *part,
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unsigned int inflight[2]);
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void part_dec_in_flight(struct request_queue *q, struct hd_struct *part,
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int rw);
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void part_inc_in_flight(struct request_queue *q, struct hd_struct *part,
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int rw);
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static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk)
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{
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if (disk)
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return kzalloc_node(sizeof(struct partition_meta_info),
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GFP_KERNEL, disk->node_id);
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return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL);
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}
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static inline void free_part_info(struct hd_struct *part)
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{
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kfree(part->info);
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}
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/* block/blk-core.c */
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extern void part_round_stats(struct request_queue *q, int cpu, struct hd_struct *part);
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/* block/genhd.c */
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extern void device_add_disk(struct device *parent, struct gendisk *disk);
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static inline void add_disk(struct gendisk *disk)
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{
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device_add_disk(NULL, disk);
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}
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extern void device_add_disk_no_queue_reg(struct device *parent, struct gendisk *disk);
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static inline void add_disk_no_queue_reg(struct gendisk *disk)
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{
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device_add_disk_no_queue_reg(NULL, disk);
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}
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extern void del_gendisk(struct gendisk *gp);
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extern struct gendisk *get_gendisk(dev_t dev, int *partno);
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extern struct block_device *bdget_disk(struct gendisk *disk, int partno);
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extern void set_device_ro(struct block_device *bdev, int flag);
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extern void set_disk_ro(struct gendisk *disk, int flag);
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static inline int get_disk_ro(struct gendisk *disk)
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{
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return disk->part0.policy;
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}
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extern void disk_block_events(struct gendisk *disk);
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extern void disk_unblock_events(struct gendisk *disk);
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extern void disk_flush_events(struct gendisk *disk, unsigned int mask);
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extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask);
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/* drivers/char/random.c */
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extern void add_disk_randomness(struct gendisk *disk) __latent_entropy;
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extern void rand_initialize_disk(struct gendisk *disk);
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static inline sector_t get_start_sect(struct block_device *bdev)
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{
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return bdev->bd_part->start_sect;
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}
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static inline sector_t get_capacity(struct gendisk *disk)
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{
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return disk->part0.nr_sects;
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}
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static inline void set_capacity(struct gendisk *disk, sector_t size)
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{
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disk->part0.nr_sects = size;
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}
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#ifdef CONFIG_SOLARIS_X86_PARTITION
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#define SOLARIS_X86_NUMSLICE 16
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#define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL)
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struct solaris_x86_slice {
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__le16 s_tag; /* ID tag of partition */
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__le16 s_flag; /* permission flags */
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__le32 s_start; /* start sector no of partition */
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__le32 s_size; /* # of blocks in partition */
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};
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struct solaris_x86_vtoc {
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unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */
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__le32 v_sanity; /* to verify vtoc sanity */
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__le32 v_version; /* layout version */
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char v_volume[8]; /* volume name */
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__le16 v_sectorsz; /* sector size in bytes */
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__le16 v_nparts; /* number of partitions */
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unsigned int v_reserved[10]; /* free space */
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struct solaris_x86_slice
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v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */
|
|
unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
|
|
char v_asciilabel[128]; /* for compatibility */
|
|
};
|
|
|
|
#endif /* CONFIG_SOLARIS_X86_PARTITION */
|
|
|
|
#ifdef CONFIG_BSD_DISKLABEL
|
|
/*
|
|
* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
|
|
* updated by Marc Espie <Marc.Espie@openbsd.org>
|
|
*/
|
|
|
|
/* check against BSD src/sys/sys/disklabel.h for consistency */
|
|
|
|
#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
|
|
#define BSD_MAXPARTITIONS 16
|
|
#define OPENBSD_MAXPARTITIONS 16
|
|
#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
|
|
struct bsd_disklabel {
|
|
__le32 d_magic; /* the magic number */
|
|
__s16 d_type; /* drive type */
|
|
__s16 d_subtype; /* controller/d_type specific */
|
|
char d_typename[16]; /* type name, e.g. "eagle" */
|
|
char d_packname[16]; /* pack identifier */
|
|
__u32 d_secsize; /* # of bytes per sector */
|
|
__u32 d_nsectors; /* # of data sectors per track */
|
|
__u32 d_ntracks; /* # of tracks per cylinder */
|
|
__u32 d_ncylinders; /* # of data cylinders per unit */
|
|
__u32 d_secpercyl; /* # of data sectors per cylinder */
|
|
__u32 d_secperunit; /* # of data sectors per unit */
|
|
__u16 d_sparespertrack; /* # of spare sectors per track */
|
|
__u16 d_sparespercyl; /* # of spare sectors per cylinder */
|
|
__u32 d_acylinders; /* # of alt. cylinders per unit */
|
|
__u16 d_rpm; /* rotational speed */
|
|
__u16 d_interleave; /* hardware sector interleave */
|
|
__u16 d_trackskew; /* sector 0 skew, per track */
|
|
__u16 d_cylskew; /* sector 0 skew, per cylinder */
|
|
__u32 d_headswitch; /* head switch time, usec */
|
|
__u32 d_trkseek; /* track-to-track seek, usec */
|
|
__u32 d_flags; /* generic flags */
|
|
#define NDDATA 5
|
|
__u32 d_drivedata[NDDATA]; /* drive-type specific information */
|
|
#define NSPARE 5
|
|
__u32 d_spare[NSPARE]; /* reserved for future use */
|
|
__le32 d_magic2; /* the magic number (again) */
|
|
__le16 d_checksum; /* xor of data incl. partitions */
|
|
|
|
/* filesystem and partition information: */
|
|
__le16 d_npartitions; /* number of partitions in following */
|
|
__le32 d_bbsize; /* size of boot area at sn0, bytes */
|
|
__le32 d_sbsize; /* max size of fs superblock, bytes */
|
|
struct bsd_partition { /* the partition table */
|
|
__le32 p_size; /* number of sectors in partition */
|
|
__le32 p_offset; /* starting sector */
|
|
__le32 p_fsize; /* filesystem basic fragment size */
|
|
__u8 p_fstype; /* filesystem type, see below */
|
|
__u8 p_frag; /* filesystem fragments per block */
|
|
__le16 p_cpg; /* filesystem cylinders per group */
|
|
} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
|
|
};
|
|
|
|
#endif /* CONFIG_BSD_DISKLABEL */
|
|
|
|
#ifdef CONFIG_UNIXWARE_DISKLABEL
|
|
/*
|
|
* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
|
|
* and Krzysztof G. Baranowski <kgb@knm.org.pl>
|
|
*/
|
|
|
|
#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
|
|
#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
|
|
#define UNIXWARE_NUMSLICE 16
|
|
#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
|
|
|
|
struct unixware_slice {
|
|
__le16 s_label; /* label */
|
|
__le16 s_flags; /* permission flags */
|
|
__le32 start_sect; /* starting sector */
|
|
__le32 nr_sects; /* number of sectors in slice */
|
|
};
|
|
|
|
struct unixware_disklabel {
|
|
__le32 d_type; /* drive type */
|
|
__le32 d_magic; /* the magic number */
|
|
__le32 d_version; /* version number */
|
|
char d_serial[12]; /* serial number of the device */
|
|
__le32 d_ncylinders; /* # of data cylinders per device */
|
|
__le32 d_ntracks; /* # of tracks per cylinder */
|
|
__le32 d_nsectors; /* # of data sectors per track */
|
|
__le32 d_secsize; /* # of bytes per sector */
|
|
__le32 d_part_start; /* # of first sector of this partition */
|
|
__le32 d_unknown1[12]; /* ? */
|
|
__le32 d_alt_tbl; /* byte offset of alternate table */
|
|
__le32 d_alt_len; /* byte length of alternate table */
|
|
__le32 d_phys_cyl; /* # of physical cylinders per device */
|
|
__le32 d_phys_trk; /* # of physical tracks per cylinder */
|
|
__le32 d_phys_sec; /* # of physical sectors per track */
|
|
__le32 d_phys_bytes; /* # of physical bytes per sector */
|
|
__le32 d_unknown2; /* ? */
|
|
__le32 d_unknown3; /* ? */
|
|
__le32 d_pad[8]; /* pad */
|
|
|
|
struct unixware_vtoc {
|
|
__le32 v_magic; /* the magic number */
|
|
__le32 v_version; /* version number */
|
|
char v_name[8]; /* volume name */
|
|
__le16 v_nslices; /* # of slices */
|
|
__le16 v_unknown1; /* ? */
|
|
__le32 v_reserved[10]; /* reserved */
|
|
struct unixware_slice
|
|
v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
|
|
} vtoc;
|
|
|
|
}; /* 408 */
|
|
|
|
#endif /* CONFIG_UNIXWARE_DISKLABEL */
|
|
|
|
#ifdef CONFIG_MINIX_SUBPARTITION
|
|
# define MINIX_NR_SUBPARTITIONS 4
|
|
#endif /* CONFIG_MINIX_SUBPARTITION */
|
|
|
|
#define ADDPART_FLAG_NONE 0
|
|
#define ADDPART_FLAG_RAID 1
|
|
#define ADDPART_FLAG_WHOLEDISK 2
|
|
|
|
extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
|
|
extern void blk_free_devt(dev_t devt);
|
|
extern dev_t blk_lookup_devt(const char *name, int partno);
|
|
extern char *disk_name (struct gendisk *hd, int partno, char *buf);
|
|
|
|
extern int disk_expand_part_tbl(struct gendisk *disk, int target);
|
|
extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev);
|
|
extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev);
|
|
extern struct hd_struct * __must_check add_partition(struct gendisk *disk,
|
|
int partno, sector_t start,
|
|
sector_t len, int flags,
|
|
struct partition_meta_info
|
|
*info);
|
|
extern void __delete_partition(struct percpu_ref *);
|
|
extern void delete_partition(struct gendisk *, int);
|
|
extern void printk_all_partitions(void);
|
|
|
|
extern struct gendisk *__alloc_disk_node(int minors, int node_id);
|
|
extern struct kobject *get_disk_and_module(struct gendisk *disk);
|
|
extern void put_disk(struct gendisk *disk);
|
|
extern void put_disk_and_module(struct gendisk *disk);
|
|
extern void blk_register_region(dev_t devt, unsigned long range,
|
|
struct module *module,
|
|
struct kobject *(*probe)(dev_t, int *, void *),
|
|
int (*lock)(dev_t, void *),
|
|
void *data);
|
|
extern void blk_unregister_region(dev_t devt, unsigned long range);
|
|
|
|
extern ssize_t part_size_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
extern ssize_t part_stat_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
extern ssize_t part_inflight_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
#ifdef CONFIG_FAIL_MAKE_REQUEST
|
|
extern ssize_t part_fail_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf);
|
|
extern ssize_t part_fail_store(struct device *dev,
|
|
struct device_attribute *attr,
|
|
const char *buf, size_t count);
|
|
#endif /* CONFIG_FAIL_MAKE_REQUEST */
|
|
|
|
#define alloc_disk_node(minors, node_id) \
|
|
({ \
|
|
static struct lock_class_key __key; \
|
|
const char *__name; \
|
|
struct gendisk *__disk; \
|
|
\
|
|
__name = "(gendisk_completion)"#minors"("#node_id")"; \
|
|
\
|
|
__disk = __alloc_disk_node(minors, node_id); \
|
|
\
|
|
if (__disk) \
|
|
lockdep_init_map(&__disk->lockdep_map, __name, &__key, 0); \
|
|
\
|
|
__disk; \
|
|
})
|
|
|
|
#define alloc_disk(minors) alloc_disk_node(minors, NUMA_NO_NODE)
|
|
|
|
static inline int hd_ref_init(struct hd_struct *part)
|
|
{
|
|
if (percpu_ref_init(&part->ref, __delete_partition, 0,
|
|
GFP_KERNEL))
|
|
return -ENOMEM;
|
|
return 0;
|
|
}
|
|
|
|
static inline void hd_struct_get(struct hd_struct *part)
|
|
{
|
|
percpu_ref_get(&part->ref);
|
|
}
|
|
|
|
static inline int hd_struct_try_get(struct hd_struct *part)
|
|
{
|
|
return percpu_ref_tryget_live(&part->ref);
|
|
}
|
|
|
|
static inline void hd_struct_put(struct hd_struct *part)
|
|
{
|
|
percpu_ref_put(&part->ref);
|
|
}
|
|
|
|
static inline void hd_struct_kill(struct hd_struct *part)
|
|
{
|
|
percpu_ref_kill(&part->ref);
|
|
}
|
|
|
|
static inline void hd_free_part(struct hd_struct *part)
|
|
{
|
|
free_part_stats(part);
|
|
free_part_info(part);
|
|
percpu_ref_exit(&part->ref);
|
|
}
|
|
|
|
/*
|
|
* Any access of part->nr_sects which is not protected by partition
|
|
* bd_mutex or gendisk bdev bd_mutex, should be done using this
|
|
* accessor function.
|
|
*
|
|
* Code written along the lines of i_size_read() and i_size_write().
|
|
* CONFIG_PREEMPT case optimizes the case of UP kernel with preemption
|
|
* on.
|
|
*/
|
|
static inline sector_t part_nr_sects_read(struct hd_struct *part)
|
|
{
|
|
#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
|
|
sector_t nr_sects;
|
|
unsigned seq;
|
|
do {
|
|
seq = read_seqcount_begin(&part->nr_sects_seq);
|
|
nr_sects = part->nr_sects;
|
|
} while (read_seqcount_retry(&part->nr_sects_seq, seq));
|
|
return nr_sects;
|
|
#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
|
|
sector_t nr_sects;
|
|
|
|
preempt_disable();
|
|
nr_sects = part->nr_sects;
|
|
preempt_enable();
|
|
return nr_sects;
|
|
#else
|
|
return part->nr_sects;
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Should be called with mutex lock held (typically bd_mutex) of partition
|
|
* to provide mutual exlusion among writers otherwise seqcount might be
|
|
* left in wrong state leaving the readers spinning infinitely.
|
|
*/
|
|
static inline void part_nr_sects_write(struct hd_struct *part, sector_t size)
|
|
{
|
|
#if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP)
|
|
write_seqcount_begin(&part->nr_sects_seq);
|
|
part->nr_sects = size;
|
|
write_seqcount_end(&part->nr_sects_seq);
|
|
#elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT)
|
|
preempt_disable();
|
|
part->nr_sects = size;
|
|
preempt_enable();
|
|
#else
|
|
part->nr_sects = size;
|
|
#endif
|
|
}
|
|
|
|
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
|
extern void blk_integrity_add(struct gendisk *);
|
|
extern void blk_integrity_del(struct gendisk *);
|
|
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
|
static inline void blk_integrity_add(struct gendisk *disk) { }
|
|
static inline void blk_integrity_del(struct gendisk *disk) { }
|
|
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
#else /* CONFIG_BLOCK */
|
|
|
|
static inline void printk_all_partitions(void) { }
|
|
|
|
static inline dev_t blk_lookup_devt(const char *name, int partno)
|
|
{
|
|
dev_t devt = MKDEV(0, 0);
|
|
return devt;
|
|
}
|
|
#endif /* CONFIG_BLOCK */
|
|
|
|
#endif /* _LINUX_GENHD_H */
|