Alex Elder 3e83b65bb9 rbd: don't create sysfs entries for non-mapped snapshots ... When an rbd image gets mapped a device entry gets created for it under /sys/bus/rbd/devices/<id>/. Inside that directory there are sysfs files that contain information about the image: its size, feature bits, major device number, and so on. Additionally, if that image has any snapshots, a device entry gets created for each of those as a "child" of the mapped device. Each of these is a subdirectory of the mapped device, and each directory contains a few files with information about the snapshot (its snapshot id, size, and feature mask). There is no clear benefit to having those device entries for the snapshots. The information provided via sysfs of of little real value--and all of it is available via rbd CLI commands. If we still wanted to see the kernel's view of this information it could be done much more simply by including it in a single sysfs file for the mapped image. But there *is* a clear cost to supporting them. Every time a snapshot context changes, these entries need to be updated (deleted snapshots removed, new snapshots created). The rbd driver is notified of changes to the snapshot context via callbacks from an osd, and care must be taken to coordinate removal of snapshot data structures with the possibility of one these notifications occurring. Things would be considerably simpler if we just didn't have to maintain device entries for the snapshots. So get rid of them. The ability to map a snapshot of an rbd image will remain; the only thing lost will be the ability to query these sysfs directories for information about snapshots of mapped images. This resolves: http://tracker.ceph.com/issues/4796 Signed-off-by: Alex Elder <elder@inktank.com> Reviewed-by: Josh Durgin <josh.durgin@inktank.com>		2013-05-01 21:19:25 -07:00
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ABI	rbd: don't create sysfs entries for non-mapped snapshots	2013-05-01 21:19:25 -07:00
DocBook	tty: Documentation: fix a path in a DocBook template	2013-04-03 11:45:38 -07:00
EDID	drm: Load EDID: Explain better how to write your own EDID firmware	2013-01-20 19:22:19 +10:00
PCI	PCI/MSI: Enable multiple MSIs with pci_enable_msi_block_auto()	2013-01-24 17:25:13 +01:00
RCU	Merge branches 'urgent.2012.10.27a', 'doc.2012.11.16a', 'fixes.2012.11.13a', 'srcu.2012.10.27a', 'stall.2012.11.13a', 'tracing.2012.11.08a' and 'idle.2012.10.24a' into HEAD	2012-11-16 09:59:58 -08:00
accounting	doc: Remove unnecessary declarations from Documentation/accounting/getdelays.c	2012-11-26 14:22:21 +01:00
acpi	ACPI / Documentation: refer to correct file for acpi_platform_device_ids[] table	2013-02-13 13:43:02 +01:00
aoe	aoe: allow user to disable target failure timeout	2012-12-17 17:15:25 -08:00
arm	fbdev changes for 3.8:	2012-12-15 13:03:48 -08:00
arm64	arm64: Add simple earlyprintk support	2013-01-22 17:51:01 +00:00
auxdisplay	…
backlight	backlight: lp855x_bl: support new LP8557 device	2013-02-21 17:22:25 -08:00
blackfin	…
block	cfq-iosched: enable full blkcg hierarchy support	2013-01-09 08:05:11 -08:00
blockdev	nbd: update documentation and link to mailinglist	2013-02-27 19:10:22 -08:00
bus-devices	ARM: OMAP2+: gpmc: generic timing calculation	2012-11-09 18:07:11 +05:30
cdrom	…
cgroups	Merge branch 'for-3.9/core' of git://git.kernel.dk/linux-block	2013-02-28 12:52:24 -08:00
connector	…
console	…
cpu-freq	cpufreq: Update Documentation for cpus and related_cpus	2013-02-02 00:01:16 +01:00
cpuidle	Honor state disabling in the cpuidle ladder governor	2012-09-04 01:35:44 +02:00
cris	…
crypto	KEYS: Document asymmetric key type	2012-10-08 13:50:12 +10:30
development-process	…
device-mapper	md updates for 3.9	2013-03-05 17:22:08 -08:00
devicetree	This is the first batch of MFD fixes for 3.9.	2013-03-15 17:34:01 -07:00
driver-model	lib: devres: Introduce devm_ioremap_resource()	2013-01-22 09:41:43 -08:00
dvb	[media] get_dvb_firmware: Fix the location of firmware for Terratec HTC	2013-01-01 11:18:26 -02:00
early-userspace	…
extcon	…
fault-injection	doc: fix quite a few typos within Documentation	2012-11-19 14:28:24 +01:00
fb	…
filesystems	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2013-02-26 20:16:07 -08:00
firmware_class	firmware loader: document firmware cache mechanism	2012-11-14 15:07:18 -08:00
frv	…
hid	HID: remove x bit from sensor doc	2012-12-14 08:48:59 +01:00
hwmon	hwmon: (lm75) Fix tcn75 prefix	2013-03-18 21:19:49 +01:00
i2c	i2c: Fix my e-mail address in drivers and documentation	2013-03-22 11:18:34 +01:00
i2o	…
ia64	doc: aliasing-test: close fd on write error	2012-09-01 09:57:10 -07:00
ide	…
infiniband	IB/ipoib: Add rtnl_link_ops support	2012-09-20 16:49:17 -04:00
input	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input	2013-03-11 07:49:37 -07:00
ioctl	wanrouter: completely decouple obsolete code from kernel.	2013-01-31 19:20:33 -05:00
isdn	…
ja_JP	…
kbuild	Merge branch 'kconfig' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild	2013-02-27 12:28:30 -08:00
kdump	…
ko_KR	…
laptops	Documentation/laptops: remove depends on CONFIG_EXPERIMENTAL	2013-01-21 14:52:42 -08:00
leds	Documentation: leds: update LP55xx family devices	2013-02-06 15:59:30 -08:00
m68k	…
make	…
memory-devices	…
metag	metag: Basic documentation	2013-03-02 20:09:50 +00:00
mips	…
misc-devices	doc: fix quite a few typos within Documentation	2012-11-19 14:28:24 +01:00
mmc	mmc: core: Extend sysfs to ext_csd parameters for RPMB support	2012-12-06 13:54:48 -05:00
mn10300	…
mtd	…
namespaces	userns: Recommend use of memory control groups.	2013-01-26 22:20:06 -08:00
netlabel	…
networking	ipvs: add backup_only flag to avoid loops	2013-03-19 21:21:51 +09:00
nfc	NFC: Update pn544 documentation	2013-01-10 01:27:46 +01:00
parisc	…
pcmcia	…
power	PM / OPP: improve introductory documentation	2013-03-04 14:23:11 +01:00
powerpc	powerpc: Documentation for transactional memory on powerpc	2013-02-15 17:02:25 +11:00
pps	…
prctl	seccomp: Make syscall skipping and nr changes more consistent	2012-10-02 21:14:29 +10:00
pti	…
ptp	…
rapidio	…
s390	…
scheduler	sched: Remove __ARCH_WANT_INTERRUPTS_ON_CTXSW	2012-09-13 16:52:04 +02:00
scsi	[SCSI] qla2xxx: Update copyright dates information in LICENSE.qla2xxx file.	2013-04-06 11:31:30 +01:00
security	Documentation: fix Documentation/security/00-INDEX	2012-12-17 17:15:22 -08:00
serial	tty: Update serial core API documentation	2013-01-15 21:57:44 -08:00
sh	…
sound	Revert "ALSA: hda - Allow power_save_controller option override DCAPS"	2013-04-04 15:35:39 +02:00
spi	Documentation: remove __dev* attributes.	2013-01-03 15:57:16 -08:00
sysctl	Documentation/sysctl/kernel.txt: document /proc/sys/shmall	2013-01-04 16:11:46 -08:00
target	target: Simplify fabric sense data length handling	2012-09-17 17:12:58 -07:00
thermal	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/rzhang/linux	2013-02-28 19:48:26 -08:00
timers	…
trace	Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-03-11 07:54:29 -07:00
usb	USB: report submission of active URBs	2012-11-11 18:10:46 -08:00
vDSO	…
video4linux	[media] radio-si470x doc: add info about v4l2-ctl and sox+alsa	2013-02-13 17:33:20 -02:00
virtual	Merge tag 'kvm-3.9-1' of git://git.kernel.org/pub/scm/virt/kvm/kvm	2013-02-24 13:07:18 -08:00
vm	ksm: add some comments	2013-02-23 17:50:23 -08:00
w1	w1: w1_therm: Add force-pullup option for "broken" sensors	2013-02-18 13:55:24 -08:00
watchdog	watchdog: core: dt: add support for the timeout-sec dt property	2013-03-01 12:48:36 +01:00
wimax	…
x86	Merge branch 'x86/microcode' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-02-22 19:22:52 -08:00
xtensa	xtensa: initialize atomctl SR	2012-12-18 21:10:22 -08:00
zh_CN	Driver core patches for 3.9-rc1	2013-02-21 12:05:51 -08:00
.gitignore	…
00-INDEX	ImgTec Meta architecture changes for v3.9-rc1	2013-03-03 12:06:09 -08:00
BUG-HUNTING	…
Changes	…
CodingStyle	Documentation: remove depends on CONFIG_EXPERIMENTAL	2013-01-11 11:38:03 -08:00
DMA-API-HOWTO.txt	Documentation/DMA-API-HOWTO.txt: fix typo	2013-02-27 19:10:23 -08:00
DMA-API.txt	dma-debug: New interfaces to debug dma mapping errors	2012-10-24 17:06:43 +02:00
DMA-ISA-LPC.txt	…
DMA-attributes.txt	common: DMA-mapping: add DMA_ATTR_FORCE_CONTIGUOUS attribute	2012-11-29 03:30:34 -08:00
HOWTO	HOWTO: fix double words typo	2012-12-10 15:54:27 +01:00
IPMI.txt	ipmi: add options to disable openfirmware and PCI scanning	2013-02-27 19:10:21 -08:00
IRQ-affinity.txt	…
IRQ-domain.txt	irqdomain: update documentation	2012-12-05 23:52:10 +00:00
IRQ.txt	…
Intel-IOMMU.txt	…
Makefile	…
ManagementStyle	…
SAK.txt	…
SM501.txt	…
SecurityBugs	…
SubmitChecklist	…
SubmittingDrivers	…
SubmittingPatches	Randy has moved	2013-03-08 15:05:34 -08:00
VGA-softcursor.txt	…
applying-patches.txt	…
atomic_ops.txt	Documentation: Memory barrier semantics of atomic_xchg()	2013-01-08 14:14:55 -08:00
bad_memory.txt	…
basic_profiling.txt	…
binfmt_misc.txt	…
braille-console.txt	…
bt8xxgpio.txt	…
btmrvl.txt	…
bus-virt-phys-mapping.txt	…
cachetlb.txt	…
circular-buffers.txt	…
clk.txt	…
coccinelle.txt	coccicheck: Allow the user to give a V= (verbose) argument	2013-02-22 11:39:13 +01:00
cpu-hotplug.txt	doc: Add x86 CPU0 online/offline feature	2012-11-14 09:39:44 -08:00
cpu-load.txt	…
cputopology.txt	…
crc32.txt	…
dcdbas.txt	…
debugging-modules.txt	…
debugging-via-ohci1394.txt	…
dell_rbu.txt	…
devices.txt	firmware: remove last vestiges of dabusb	2012-11-21 13:03:01 -08:00
digsig.txt	…
dma-buf-sharing.txt	dma-buf: implement vmap refcounting in the interface logic	2013-02-27 15:13:36 +05:30
dmaengine.txt	…
dontdiff	x86: remove offsets.h from .gitignore and dontdiff	2012-11-19 14:10:53 +01:00
dynamic-debug-howto.txt	dynamic_debug: dynamic hex dump	2013-01-17 12:19:09 -08:00
edac.txt	Merge branch 'devel'	2012-07-29 21:11:05 -03:00
eisa.txt	…
email-clients.txt	…
flexible-arrays.txt	…
futex-requeue-pi.txt	…
gcov.txt	…
gpio.txt	gpiolib: provide provision to register pin ranges	2012-11-11 19:06:00 +01:00
highuid.txt	…
hw_random.txt	…
hwspinlock.txt	…
init.txt	…
initrd.txt	…
intel_txt.txt	Documentation: remove depends on CONFIG_EXPERIMENTAL	2013-01-11 11:38:03 -08:00
io-mapping.txt	…
io_ordering.txt	…
iostats.txt	…
irqflags-tracing.txt	…
isapnp.txt	…
java.txt	…
kernel-doc-nano-HOWTO.txt	Kernel-doc: Convention: Use a "Return" section to describe return values	2012-11-27 21:08:57 +01:00
kernel-docs.txt	…
kernel-parameters.txt	Merge branch 'x86-kdump-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2013-04-20 18:40:36 -07:00
kmemcheck.txt	…
kmemleak.txt	…
kobject.txt	Documentation: Fix "struct kobj_type" to include newer members.	2012-09-04 16:06:34 -07:00
kprobes.txt	…
kref.txt	kref: Add kref_get_unless_zero documentation	2012-11-28 18:36:06 +10:00
ldm.txt	…
local_ops.txt	…
lockdep-design.txt	…
lockstat.txt	locking/stat: Fix a typo	2013-02-19 08:42:37 +01:00
lockup-watchdogs.txt	…
logo.gif	…
logo.txt	…
magic-number.txt	wanrouter: completely decouple obsolete code from kernel.	2013-01-31 19:20:33 -05:00
md.txt	…
media-framework.txt	[media] Documentation/media-framework.txt: fix a sentence	2013-02-08 13:27:13 -02:00
memory-barriers.txt	Documentation: Memory barrier semantics of atomic_xchg()	2013-01-08 14:14:55 -08:00
memory-hotplug.txt	hotplug: update nodemasks management	2012-12-12 17:38:33 -08:00
mono.txt	…
mutex-design.txt	…
nommu-mmap.txt	…
numastat.txt	…
oops-tracing.txt	…
padata.txt	…
parport-lowlevel.txt	…
parport.txt	…
percpu-rw-semaphore.txt	percpu-rw-semaphore: fix documentation typos	2012-09-26 19:56:15 +02:00
pi-futex.txt	…
pinctrl.txt	drivers/pinctrl: grab default handles from device core	2013-01-23 16:39:51 +01:00
pnp.txt	…
preempt-locking.txt	…
printk-formats.txt	Randy has moved	2013-03-08 15:05:34 -08:00
pwm.txt	pwm: add devm_pwm_get() and devm_pwm_put()	2012-09-10 17:05:45 +02:00
ramoops.txt	pstore/ftrace: Convert to its own enable/disable debugfs knob	2012-09-06 22:16:58 -07:00
rbtree.txt	rbtree: move augmented rbtree functionality to rbtree_augmented.h	2012-10-09 16:22:40 +09:00
remoteproc.txt	remoteproc: add rproc_report_crash function to notify rproc crashes	2012-09-18 12:53:22 +03:00
rfkill.txt	…
robust-futex-ABI.txt	…
robust-futexes.txt	…
rpmsg.txt	Documentation: remove __dev* attributes.	2013-01-03 15:57:16 -08:00
rt-mutex-design.txt	…
rt-mutex.txt	…
rtc.txt	rtc-proc: permit the /proc/driver/rtc device to use other devices	2012-10-06 03:05:01 +09:00
serial-console.txt	…
sgi-ioc4.txt	…
sgi-visws.txt	…
smsc_ece1099.txt	mfd: smsc: Add support for smsc gpio io/keypad driver	2012-10-01 15:27:48 +02:00
sparse.txt	Documentation/sparse.txt: document context annotations for lock checking	2012-12-17 17:15:23 -08:00
spinlocks.txt	…
stable_api_nonsense.txt	…
stable_kernel_rules.txt	…
static-keys.txt	…
svga.txt	…
sysfs-rules.txt	…
sysrq.txt	sparc64: Add global PMU register dumping via sysrq.	2012-10-16 09:34:01 -07:00
unaligned-memory-access.txt	…
unicode.txt	…
unshare.txt	…
vfio.txt	vfio: Trivial Documentation correction	2012-09-21 10:48:03 -06:00
vgaarbiter.txt	…
video-output.txt	…
vme_api.txt	…
volatile-considered-harmful.txt	…
workqueue.txt	…
xz.txt	…
zorro.txt	…