764 lines
23 KiB
C
764 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_work rcu_work;
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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 */
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unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */
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char v_asciilabel[128]; /* for compatibility */
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};
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#endif /* CONFIG_SOLARIS_X86_PARTITION */
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#ifdef CONFIG_BSD_DISKLABEL
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/*
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* BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il>
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* updated by Marc Espie <Marc.Espie@openbsd.org>
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*/
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/* check against BSD src/sys/sys/disklabel.h for consistency */
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#define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */
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#define BSD_MAXPARTITIONS 16
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#define OPENBSD_MAXPARTITIONS 16
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#define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */
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struct bsd_disklabel {
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__le32 d_magic; /* the magic number */
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__s16 d_type; /* drive type */
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__s16 d_subtype; /* controller/d_type specific */
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char d_typename[16]; /* type name, e.g. "eagle" */
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char d_packname[16]; /* pack identifier */
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__u32 d_secsize; /* # of bytes per sector */
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__u32 d_nsectors; /* # of data sectors per track */
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__u32 d_ntracks; /* # of tracks per cylinder */
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|
__u32 d_ncylinders; /* # of data cylinders per unit */
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__u32 d_secpercyl; /* # of data sectors per cylinder */
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__u32 d_secperunit; /* # of data sectors per unit */
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__u16 d_sparespertrack; /* # of spare sectors per track */
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__u16 d_sparespercyl; /* # of spare sectors per cylinder */
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__u32 d_acylinders; /* # of alt. cylinders per unit */
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__u16 d_rpm; /* rotational speed */
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__u16 d_interleave; /* hardware sector interleave */
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__u16 d_trackskew; /* sector 0 skew, per track */
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__u16 d_cylskew; /* sector 0 skew, per cylinder */
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__u32 d_headswitch; /* head switch time, usec */
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__u32 d_trkseek; /* track-to-track seek, usec */
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__u32 d_flags; /* generic flags */
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#define NDDATA 5
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__u32 d_drivedata[NDDATA]; /* drive-type specific information */
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#define NSPARE 5
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__u32 d_spare[NSPARE]; /* reserved for future use */
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__le32 d_magic2; /* the magic number (again) */
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__le16 d_checksum; /* xor of data incl. partitions */
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/* filesystem and partition information: */
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__le16 d_npartitions; /* number of partitions in following */
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__le32 d_bbsize; /* size of boot area at sn0, bytes */
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__le32 d_sbsize; /* max size of fs superblock, bytes */
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struct bsd_partition { /* the partition table */
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__le32 p_size; /* number of sectors in partition */
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__le32 p_offset; /* starting sector */
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__le32 p_fsize; /* filesystem basic fragment size */
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__u8 p_fstype; /* filesystem type, see below */
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__u8 p_frag; /* filesystem fragments per block */
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__le16 p_cpg; /* filesystem cylinders per group */
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} d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */
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};
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#endif /* CONFIG_BSD_DISKLABEL */
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#ifdef CONFIG_UNIXWARE_DISKLABEL
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/*
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* Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl>
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* and Krzysztof G. Baranowski <kgb@knm.org.pl>
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*/
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#define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */
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#define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */
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#define UNIXWARE_NUMSLICE 16
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#define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */
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struct unixware_slice {
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__le16 s_label; /* label */
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__le16 s_flags; /* permission flags */
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__le32 start_sect; /* starting sector */
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__le32 nr_sects; /* number of sectors in slice */
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};
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struct unixware_disklabel {
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__le32 d_type; /* drive type */
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__le32 d_magic; /* the magic number */
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__le32 d_version; /* version number */
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char d_serial[12]; /* serial number of the device */
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__le32 d_ncylinders; /* # of data cylinders per device */
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__le32 d_ntracks; /* # of tracks per cylinder */
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__le32 d_nsectors; /* # of data sectors per track */
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__le32 d_secsize; /* # of bytes per sector */
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__le32 d_part_start; /* # of first sector of this partition */
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__le32 d_unknown1[12]; /* ? */
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__le32 d_alt_tbl; /* byte offset of alternate table */
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__le32 d_alt_len; /* byte length of alternate table */
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__le32 d_phys_cyl; /* # of physical cylinders per device */
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__le32 d_phys_trk; /* # of physical tracks per cylinder */
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|
__le32 d_phys_sec; /* # of physical sectors per track */
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|
__le32 d_phys_bytes; /* # of physical bytes per sector */
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|
__le32 d_unknown2; /* ? */
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|
__le32 d_unknown3; /* ? */
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__le32 d_pad[8]; /* pad */
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|
|
|
struct unixware_vtoc {
|
|
__le32 v_magic; /* the magic number */
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|
__le32 v_version; /* version number */
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char v_name[8]; /* volume name */
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|
__le16 v_nslices; /* # of slices */
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|
__le16 v_unknown1; /* ? */
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|
__le32 v_reserved[10]; /* reserved */
|
|
struct unixware_slice
|
|
v_slice[UNIXWARE_NUMSLICE]; /* slice headers */
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} vtoc;
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|
|
|
}; /* 408 */
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|
|
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#endif /* CONFIG_UNIXWARE_DISKLABEL */
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|
|
|
#ifdef CONFIG_MINIX_SUBPARTITION
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# define MINIX_NR_SUBPARTITIONS 4
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#endif /* CONFIG_MINIX_SUBPARTITION */
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|
|
|
#define ADDPART_FLAG_NONE 0
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|
#define ADDPART_FLAG_RAID 1
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#define ADDPART_FLAG_WHOLEDISK 2
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|
|
|
extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt);
|
|
extern void blk_free_devt(dev_t devt);
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|
extern void blk_invalidate_devt(dev_t devt);
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extern dev_t blk_lookup_devt(const char *name, int partno);
|
|
extern char *disk_name (struct gendisk *hd, int partno, char *buf);
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|
|
|
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);
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|
|
|
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);
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|
|
|
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);
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|
#endif /* CONFIG_FAIL_MAKE_REQUEST */
|
|
|
|
#define alloc_disk_node(minors, node_id) \
|
|
({ \
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|
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)
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|
|
|
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 */
|