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freebsd-skq/sys/geom/geom_int.h

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Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
/*-
sys/geom: adoption of SPDX licensing ID tags. Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
2017-11-27 15:17:37 +00:00
* SPDX-License-Identifier: BSD-3-Clause
*
Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
* Copyright (c) 2002 Poul-Henning Kamp
* Copyright (c) 2002 Networks Associates Technology, Inc.
* All rights reserved.
*
* This software was developed for the FreeBSD Project by Poul-Henning Kamp
* and NAI Labs, the Security Research Division of Network Associates, Inc.
* under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
* DARPA CHATS research program.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The names of the authors may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
LIST_HEAD(class_list_head, g_class);
TAILQ_HEAD(g_tailq_head, g_geom);
Commit the correct copy of the g_stat structure. Add debug.sizeof.g_stat sysctl. Set the id field of the g_stat when we create consumers and providers. Remove biocount from consumer, we will use the counters in the g_stat structure instead. Replace one field which will need to be atomically manipulated with two fields which will not (stat.nop and stat.nend). Change add companion field to bio_children: bio_inbed for the exact same reason. Don't output the biocount in the confdot output. Fix KASSERT in g_io_request(). Add sysctl kern.geom.collectstats defaulting to off. Collect the following raw statistics conditioned on this sysctl: for each consumer and provider { total number of operations started. total number of operations completed. time last operation completed. sum of idle-time. for each of BIO_READ, BIO_WRITE and BIO_DELETE { number of operations completed. number of bytes completed. number of ENOMEM errors. number of other errors. sum of transaction time. } } API for getting hold of these statistics data not included yet.
2003-02-07 23:08:24 +00:00
extern int g_collectstats;
Merge GEOM direct dispatch changes from the projects/camlock branch. When safety requirements are met, it allows to avoid passing I/O requests to GEOM g_up/g_down thread, executing them directly in the caller context. That allows to avoid CPU bottlenecks in g_up/g_down threads, plus avoid several context switches per I/O. The defined now safety requirements are: - caller should not hold any locks and should be reenterable; - callee should not depend on GEOM dual-threaded concurency semantics; - on the way down, if request is unmapped while callee doesn't support it, the context should be sleepable; - kernel thread stack usage should be below 50%. To keep compatibility with GEOM classes not meeting above requirements new provider and consumer flags added: - G_CF_DIRECT_SEND -- consumer code meets caller requirements (request); - G_CF_DIRECT_RECEIVE -- consumer code meets callee requirements (done); - G_PF_DIRECT_SEND -- provider code meets caller requirements (done); - G_PF_DIRECT_RECEIVE -- provider code meets callee requirements (request). Capable GEOM class can set them, allowing direct dispatch in cases where it is safe. If any of requirements are not met, request is queued to g_up or g_down thread same as before. Such GEOM classes were reviewed and updated to support direct dispatch: CONCAT, DEV, DISK, GATE, MD, MIRROR, MULTIPATH, NOP, PART, RAID, STRIPE, VFS, ZERO, ZFS::VDEV, ZFS::ZVOL, all classes based on g_slice KPI (LABEL, MAP, FLASHMAP, etc). To declare direct completion capability disk(9) KPI got new flag equivalent to G_PF_DIRECT_SEND -- DISKFLAG_DIRECT_COMPLETION. da(4) and ada(4) disk drivers got it set now thanks to earlier CAM locking work. This change more then twice increases peak block storage performance on systems with manu CPUs, together with earlier CAM locking changes reaching more then 1 million IOPS (512 byte raw reads from 16 SATA SSDs on 4 HBAs to 256 user-level threads). Sponsored by: iXsystems, Inc. MFC after: 2 months
2013-10-22 08:22:19 +00:00
#define G_STATS_PROVIDERS 1 /* Collect I/O stats for providers */
#define G_STATS_CONSUMERS 2 /* Collect I/O stats for consumers */
Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
/* geom_dump.c */
Change events to have an array of "void *" references, and give the event posting functions varargs to fill these. Attribute g_call_me() to appropriate g_geom's where necessary. Add a flag argument to g_call_me() methods which will be used to signal cancellation of events in the future. This commit should be a no-op.
2003-04-02 20:41:18 +00:00
void g_confxml(void *, int flag);
Properly isolate the locking domains of sysctl from the topology lock for the sysctls which report the configuration. Sponsored by: DARPA & NAI Labs.
2002-10-04 10:38:36 +00:00
void g_conf_specific(struct sbuf *sb, struct g_class *mp, struct g_geom *gp, struct g_provider *pp, struct g_consumer *cp);
Use sbuf_cat() in GEOM confxml generation. When it comes to megabytes of text, difference between sbuf_printf() and sbuf_cat() becomes substantial. MFC after: 2 weeks Sponsored by: iXsystems, Inc.
2019-06-19 15:36:02 +00:00
void g_conf_cat_escaped(struct sbuf *sb, const char *buf);
Escape special XML chars, returned by some devices, confusing XML parsers. MFC after: 1 month
2013-11-27 14:25:06 +00:00
void g_conf_printf_escaped(struct sbuf *sb, const char *fmt, ...);
Change events to have an array of "void *" references, and give the event posting functions varargs to fill these. Attribute g_call_me() to appropriate g_geom's where necessary. Add a flag argument to g_call_me() methods which will be used to signal cancellation of events in the future. This commit should be a no-op.
2003-04-02 20:41:18 +00:00
void g_confdot(void *, int flag);
void g_conftxt(void *, int flag);
Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
/* geom_event.c */
void g_event_init(void);
void g_run_events(void);
Make withering water tight. When we orphan/wither a provider, an attached geom+consumer could end up being withered as a result and it may be in front of us in the normal object scanning order so we need to do multi-pass. On the other hand, there may be withering stuff we can't get rid off (yet), so we need to keep track of both the existence of withering stuff and if there is more we can do at this time.
2004-07-08 16:17:14 +00:00
void g_do_wither(void);
Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
/* geom_subr.c */
s/classs/classes/ to fixup grammer after the previous global renaming. Sponsored by: DARPA & NAI Labs
2002-04-04 09:41:47 +00:00
extern struct class_list_head g_classes;
Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
extern char *g_wait_event, *g_wait_sim, *g_wait_up, *g_wait_down;
Make g_wither_washer() to not loop by itself, but only when there was some more topology change done that may require its attention. Add few missing g_do_wither() calls in respective places to signal it. This fixes potential infinite loop here when some provider is withered, but still opened or connected for some reason and so can not be destroyed. For example, see r227009 and r227510.
2013-03-24 03:15:20 +00:00
void g_wither_washer(void);
Eliminate some thread pointers which do not make sense anymore. Split private parts of geom.h into geom_int.h. The latter should never be included in class implemtations.
2002-03-26 22:07:38 +00:00
/* geom_io.c */
void g_io_init(void);
void g_io_schedule_down(struct thread *tp);
void g_io_schedule_up(struct thread *tp);
/* geom_kern.c / geom_kernsim.c */
void g_init(void);
Move the shutdown eventhandler stuff to a more logical place.
2003-04-23 19:15:27 +00:00
extern int g_shutdown;
Introduce a kern.geom.notaste sysctl that can be used to temporarily disable GEOM tasting to avoid the "bouncing GEOM" problem where, when you shut down the consumer of a provider which can be viewed in multiple ways (typically a mirror whose members are labeled partitions), GEOM will immediately taste that provider's alter ego and reattach the consumer. Approved by: re (glebius)
2013-09-24 20:05:16 +00:00
extern int g_notaste;
Turn /dev/geom.ctl from a GEOM class into a plain character device driver instead, it will never see a disk-I/O transaction, so this is a lot simpler.
2003-03-24 13:37:15 +00:00
/* geom_ctl.c */
void g_ctl_init(void);
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