9164f4bf81
Implement disk_add_alias to allow aliases to be added to disks. All disk have a primary name (say "foo") can also have secondary names (say "bar") such that all instances of "foo" also have a "bar" alias. So if you have foo0, foo0p1, foo1, foo1s1 and foo1s1a nodes created by the foo driver and gpart, device nodes bar0, bar0p1, bar1, bar1s1 and bar1s1a will appear as symlinks back to the original nodes. This generalizes to multiple aliases. However, since the unit number follows the primary name, multiple device drivers can't create the same aliases unless those drives coorinate the unit number space (eg you couldn't add an alias 'disk' to both 'da' and 'ada' because it's possible to have da0 and ada0, because 'disk0' is ambiguous). Differential Revision: https://reviews.freebsd.org/D11873
155 lines
4.7 KiB
C
155 lines
4.7 KiB
C
/*-
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* Copyright (c) 2003 Poul-Henning Kamp
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* All rights reserved.
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*
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* This software was developed for the FreeBSD Project by Poul-Henning Kamp
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* and NAI Labs, the Security Research Division of Network Associates, Inc.
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* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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* DARPA CHATS research program.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The names of the authors may not be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _GEOM_GEOM_DISK_H_
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#define _GEOM_GEOM_DISK_H_
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#ifdef _KERNEL
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#include <sys/queue.h>
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#include <sys/disk.h>
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#define G_DISK_CLASS_NAME "DISK"
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struct disk;
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typedef int disk_open_t(struct disk *);
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typedef int disk_close_t(struct disk *);
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typedef void disk_strategy_t(struct bio *bp);
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typedef int disk_getattr_t(struct bio *bp);
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typedef void disk_gone_t(struct disk *);
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typedef int disk_ioctl_t(struct disk *, u_long cmd, void *data,
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int fflag, struct thread *td);
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/* NB: disk_ioctl_t SHALL be cast'able to d_ioctl_t */
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struct g_geom;
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struct devstat;
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typedef enum {
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DISK_INIT_NONE,
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DISK_INIT_START,
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DISK_INIT_DONE
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} disk_init_level;
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struct disk_alias {
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LIST_ENTRY(disk_alias) da_next;
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const char *da_alias;
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};
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struct disk {
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/* Fields which are private to geom_disk */
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struct g_geom *d_geom;
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struct devstat *d_devstat;
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int d_goneflag;
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int d_destroyed;
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disk_init_level d_init_level;
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/* Shared fields */
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u_int d_flags;
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const char *d_name;
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u_int d_unit;
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struct bio_queue_head *d_queue;
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struct mtx *d_lock;
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/* Disk methods */
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disk_open_t *d_open;
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disk_close_t *d_close;
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disk_strategy_t *d_strategy;
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disk_ioctl_t *d_ioctl;
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dumper_t *d_dump;
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disk_getattr_t *d_getattr;
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disk_gone_t *d_gone;
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/* Info fields from driver to geom_disk.c. Valid when open */
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u_int d_sectorsize;
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off_t d_mediasize;
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u_int d_fwsectors;
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u_int d_fwheads;
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u_int d_maxsize;
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off_t d_delmaxsize;
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u_int d_stripeoffset;
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u_int d_stripesize;
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char d_ident[DISK_IDENT_SIZE];
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char d_descr[DISK_IDENT_SIZE];
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uint16_t d_hba_vendor;
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uint16_t d_hba_device;
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uint16_t d_hba_subvendor;
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uint16_t d_hba_subdevice;
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uint16_t d_rotation_rate;
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/* Fields private to the driver */
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void *d_drv1;
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/* Fields private to geom_disk, to be moved on next version bump */
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LIST_HEAD(,disk_alias) d_aliases;
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};
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#define DISKFLAG_RESERVED 0x1 /* Was NEEDSGIANT */
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#define DISKFLAG_OPEN 0x2
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#define DISKFLAG_CANDELETE 0x4
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#define DISKFLAG_CANFLUSHCACHE 0x8
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#define DISKFLAG_UNMAPPED_BIO 0x10
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#define DISKFLAG_DIRECT_COMPLETION 0x20
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#define DISKFLAG_CANZONE 0x80
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#define DISK_RR_UNKNOWN 0
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#define DISK_RR_NON_ROTATING 1
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#define DISK_RR_MIN 0x0401
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#define DISK_RR_MAX 0xfffe
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struct disk *disk_alloc(void);
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void disk_create(struct disk *disk, int version);
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void disk_destroy(struct disk *disk);
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void disk_gone(struct disk *disk);
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void disk_attr_changed(struct disk *dp, const char *attr, int flag);
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void disk_media_changed(struct disk *dp, int flag);
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void disk_media_gone(struct disk *dp, int flag);
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int disk_resize(struct disk *dp, int flag);
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void disk_add_alias(struct disk *disk, const char *);
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#define DISK_VERSION_00 0x58561059
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#define DISK_VERSION_01 0x5856105a
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#define DISK_VERSION_02 0x5856105b
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#define DISK_VERSION_03 0x5856105c
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#define DISK_VERSION_04 0x5856105d
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#define DISK_VERSION_05 0x5856105e
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#define DISK_VERSION DISK_VERSION_05
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#endif /* _KERNEL */
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#endif /* _GEOM_GEOM_DISK_H_ */
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