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* Merge branch 'for-linus' of ↵Linus Torvalds2009-09-221-1/+1
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: (34 commits) trivial: fix typo in aic7xxx comment trivial: fix comment typo in drivers/ata/pata_hpt37x.c trivial: typo in kernel-parameters.txt trivial: fix typo in tracing documentation trivial: add __init/__exit macros in drivers/gpio/bt8xxgpio.c trivial: add __init macro/ fix of __exit macro location in ipmi_poweroff.c trivial: remove unnecessary semicolons trivial: Fix duplicated word "options" in comment trivial: kbuild: remove extraneous blank line after declaration of usage() trivial: improve help text for mm debug config options trivial: doc: hpfall: accept disk device to unload as argument trivial: doc: hpfall: reduce risk that hpfall can do harm trivial: SubmittingPatches: Fix reference to renumbered step trivial: fix typos "man[ae]g?ment" -> "management" trivial: media/video/cx88: add __init/__exit macros to cx88 drivers trivial: fix typo in CONFIG_DEBUG_FS in gcov doc trivial: fix missing printk space in amd_k7_smp_check trivial: fix typo s/ketymap/keymap/ in comment trivial: fix typo "to to" in multiple files trivial: fix typos in comments s/DGBU/DBGU/ ...
| * trivial: fix typo "to to" in multiple filesAnand Gadiyar2009-09-211-1/+1
| | | | | | | | | | Signed-off-by: Anand Gadiyar <gadiyar@ti.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* | UBI: eliminate possible undefined behaviourPhil Carmody2009-08-141-1/+2
|/ | | | | | | | | The assignment to pos when rb is finally NULL is undefined behaviour. Upon seeing that assignment, GCC may assume that rb is not NULL, and the loop condition ``rb'' may be optimised away. Signed-off-by: Phil Carmody <ext-phil.2.carmody@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix NOR flash recoveryArtem Bityutskiy2009-07-071-1/+3
| | | | | | | | | | | | | | | | This commit fixes NOR flash recovery issues observed with Spansion S29GL512N NOR. When NOR erases, it first fills PEBs with zeroes, then sets all bytes to 0xFF. Filling with zeroes starts from the end of the PEB. And when power is cut, this results in PEBs containing correct EC and VID headers but corrupted with zeros at the end. This confuses UBI and it mistakinly accepts these PEBs and associate them with LEBs. Fis this issue by zeroing EC and VID magics before erasing PEBs, to make UBI later refuse zem. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: nicify image sequence number handlingArtem Bityutskiy2009-07-051-2/+0
| | | | | | | | | Move the image seq. number handling from I/O level to the scanning lever, where it really belongs to. Move the @image_seq_set variable to the @struct ubi_scan_info structure, which exists only during scanning. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: add image sequence number to EC headerAdrian Hunter2009-07-051-0/+4
| | | | | | | | | | | An image sequence number is added to the UBI erase-counter header to be able determine if the root file system contains a mixture of old and new images (because the flashing failed to complete). A change to nolo is also needed for this to take effect. Signed-off-by: Adrian Hunter <adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: add reboot notifierKevin Cernekee2009-06-101-1/+3
| | | | | | | | | | Terminate the UBI background thread prior to restarting the system. [Artem: amended comments a little] Signed-off-by: Kevin Cernekee <kpc.mtd@gmail.com> Tested-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix multiple spelling typosArtem Bityutskiy2009-06-101-2/+2
| | | | | | | Some of the typos were indicated by Adrian Hunter, some by 'aspell'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: remove built-in gluebiDmitry Pervushin2009-06-021-26/+0
| | | | | | | | Remove built-in gluebi support. This is a preparation for a standalone glubi module support Signed-off-by: Dmitry Pervushin <dpervushin@embeddedalley.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: add notification APIDmitry Pervushin2009-06-021-0/+12
| | | | | | | | | | | | | | | | | | | | UBI volume notifications are intended to create the API to get clients notified about volume creation/deletion, renaming and re-sizing. A client can subscribe to these notifications using 'ubi_volume_register()' and cancel the subscription using 'ubi_volume_unregister()'. When UBI volumes change, a blocking notifier is called. Clients also can request "added" events on all volumes that existed before client subscribed to the notifications. If we use notifications instead of calling functions like 'ubi_gluebi_xxx()', we can make the MTD emulation layer to be more flexible: build it as a separate module and load/unload it on demand. [Artem: many cleanups, rework locking, add "updated" event, provide device/volume info in notifiers] Signed-off-by: Dmitry Pervushin <dpervushin@embeddedalley.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: do not switch to R/O mode on read errorsArtem Bityutskiy2009-06-021-2/+14
| | | | | | | | | | | | | | | | | | | | | | | | This patch improves UBI errors handling. ATM UBI switches to R/O mode when the WL worker fails to read the source PEB. This means that the upper layers (e.g., UBIFS) has no chances to unmap the erroneous PEB and fix the error. This patch changes this behaviour and makes UBI put PEBs like this into a separate RB-tree, thus preventing the WL worker from hitting the same read errors again and again. But there is a 10% limit on a maximum amount of PEBs like this. If there are too much of them, UBI switches to R/O mode. Additionally, this patch teaches UBI not to panic and switch to R/O mode if after a PEB has been copied, the target LEB cannot be read back. Instead, now UBI cancels the operation and schedules the target PEB for torturing. The error paths has been tested by ingecting errors into 'ubi_eba_copy_leb()'. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: introduce new constantsArtem Bityutskiy2009-06-021-0/+16
| | | | | | | | This patch is a clean-up and a preparation for the following patches. It introduece constants for the return values of the 'ubi_eba_copy_leb()' function. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: small debugging code optimizationArtem Bityutskiy2009-05-181-1/+1
| | | | | | | The @ubi->dbg_peb_buf is needed only when paranoid checks are enabled, not when debugging in general is enabled. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: re-name volumes_mutex to device_mutexArtem Bityutskiy2009-05-181-4/+4
| | | | | | | The mutex essencially protects the entire UBI device, so the old @volumes_mutex name is a little misleading. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: remove redundant mutexArtem Bityutskiy2009-05-181-2/+0
| | | | | | | | | | The @mult_mutex does not serve any purpose. We already have @volumes_mutex and it is enough. The @volume mutex is pushed down to the 'ubi_rename_volumes()', because we want first to open all volumes in the exclusive mode, and then lock the mutex, just like all other ioctl's (remove, re-size, etc) do. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: allow direct user-space I/OSidney Amani2009-01-271-1/+4
| | | | | | | | | | | Introduce a new ioctl UBI_IOCSETPROP to set properties on a volume. Also add the first property: UBI_PROP_DIRECT_WRITE, this property is used to set the ability to use direct writes in userspace Signed-off-by: Sidney Amani <seed@uffs.org> Signed-off-by: Corentin Chary <corentincj@iksaif.net> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: constify file operationsJan Engelhardt2009-01-181-3/+3
| | | | | Signed-off-by: Jan Engelhardt <jengelh@medozas.de> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: simplify PEB protection codeXiaochuan-Xu2008-12-161-17/+22
| | | | | | | | | | | | UBI has 2 RB-trees to implement PEB protection, which is too much for simply prevent PEB from being moved for some time. This patch implements this using lists. The benefits: 1. No need to allocate protection entry on each PEB get. 2. No need to maintain balanced trees and walk them. Signed-off-by: Xiaochuan-Xu <xiaochuan-xu@cqu.edu.cn> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: prepare for protection tree improvementsXiaochuan-Xu2008-12-151-2/+4
| | | | | | | | | | This patch modifies @struct ubi_wl_entry and adds union which contains only one element so far. This is just a preparation for further changes which will kill the protection tree and make UBI use a list instead. Signed-off-by: Xiaochuan-Xu <xiaochuan-xu@cqu.edu.cn> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix kernel-doc errors and warningsArtem Bityutskiy2008-07-241-0/+1
| | | | | | | No functional changes, just tweak comments to make kernel-doc work fine and stop complaining. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix checkpatch.pl errors and warningsArtem Bityutskiy2008-07-241-1/+2
| | | | | | | | Just out or curiousity ran checkpatch.pl for whole UBI, and discovered there are quite a few of stylistic issues. Fix them. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: implement multiple volumes renameArtem Bityutskiy2008-07-241-3/+30
| | | | | | | Quite useful ioctl which allows to make atomic system upgrades. The idea belongs to Richard Titmuss <richard_titmuss@logitech.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: amend commentariesArtem Bityutskiy2008-07-241-19/+18
| | | | | | | Hch asked not to use "unit" for sub-systems, let it be so. Also some other commentaries modifications. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix memory leakArtem Bityutskiy2008-07-241-1/+0
| | | | | | | | | ubi_free_volume() function sets ubi->volumes[] to NULL, so ubi_eba_close() is useless, it does not free what has to be freed. So zap it and free vol->eba_tbl at the volume release function. Pointed-out-by: Adrian Hunter <ext-adrian.hunter@nokia.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* Merge git://git.infradead.org/~dedekind/ubi-2.6David Woodhouse2008-04-231-2/+1
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| * UBI: make ubi-header.h localArtem Bityutskiy2008-04-171-2/+1
| | | | | | | | | | | | | | | | | | | | | | The new trend in linux is not to store headers which define on-media format in the include/ directory, but instead, store them locally. This is because these headers "do not define any kernel<->userspace interface". Do so for UBI as well. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* | [MTD] replace remaining __FUNCTION__ occurrencesHarvey Harrison2008-04-221-2/+2
|/ | | | | | | | __FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
* UBI: fix sparse errors in ubi.hHarvey Harrison2008-03-041-5/+5
| | | | | | | | | | | | | | | | | In C, signed 1-bit bitfields can only take the values 0 and -1, only 0 and 1 are ever assigned in current code. Make them unsigned bitfields. Fixes the (repeated) sparse errors: drivers/mtd/ubi/ubi.h:220:15: error: dubious one-bit signed bitfield drivers/mtd/ubi/ubi.h:221:17: error: dubious one-bit signed bitfield drivers/mtd/ubi/ubi.h:222:18: error: dubious one-bit signed bitfield drivers/mtd/ubi/ubi.h:223:16: error: dubious one-bit signed bitfield drivers/mtd/ubi/ubi.h:224:20: error: dubious one-bit signed bitfield Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Cc: Artem Bityutskiy <dedekind@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: implement atomic LEB change ioctlArtem Bityutskiy2008-01-251-4/+23
| | | | Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: simplify internal interfacesArtem Bityutskiy2008-01-251-2/+3
| | | | | | | Instead of passing vol_id to all functions and then find struct ubi_volume, pass struct ubi_volume pointer. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: add auto-resize featureArtem Bityutskiy2008-01-251-1/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | The problem: NAND flashes have different amount of initial bad physical eraseblocks (marked as bad by the manufacturer). For example, for 256MiB Samsung OneNAND flash there might be from 0 to 40 bad initial eraseblocks, which is about 2%. When UBI is used as the base system, one needs to know the exact amount of good physical eraseblocks, because this number is needed to create the UBI image which is put to the devices during production. But this number is not know, which forces us to use the minimum number of good physical eraseblocks. And UBI additionally reserves some percentage of physical eraseblocks for bad block handling (default is 1%), so we have 1-3% of PEBs reserved at the end, depending on the amount of initial bad PEBs. But it is desired to always have 1% (or more, depending on the configuration). Solution: this patch adds an "auto-resize" flag to the volume table. The volume which has the "auto-resize" flag will automatically be re-sized (enlarged) on the first UBI initialization. UBI clears the flag when the volume is re-sized. Only one volume may have the "auto-resize" flag. So, the production UBI image may have one volume with "auto-resize" flag set, and its size is automatically adjusted on the first boot of the device. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: use bit-fieldsArtem Bityutskiy2008-01-251-8/+8
| | | | | | Save 12 bytes of RAM per volume by using bit-fields instead of integers. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: get rid of ubi_ltree_slabArtem Bityutskiy2008-01-251-1/+0
| | | | | | | | | This slab cache is not really needed since the number of objects is low and the constructor does not make much sense because we allocate oblects when doint I/O, which is way slower then allocation. Suggested-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: use separate mutex for volumes checkingArtem Bityutskiy2007-12-261-0/+1
| | | | | | | | | Introduce a separate mutex which serializes volumes checking, because we cammot really use volumes_mutex - it cases reverse locking problems with mtd_tbl_mutex when gluebi is used - thanks to lockdep. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: handle attach ioctlArtem Bityutskiy2007-12-261-1/+1
| | | | | | Actually implement the MTD device attach/detach handlers. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: remove data_offsetArtem Bityutskiy2007-12-261-2/+1
| | | | | | | 'data_offset' parameter does not really make sense and it is not needed. Get rid of it. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: prepare attach and detach functionsArtem Bityutskiy2007-12-261-0/+5
| | | | | | | | | | Prepare the attach and detach functions to by used outside of module initialization: * detach function checks reference count before detaching * it kills the background thread as well Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: add UBI devices reference countingArtem Bityutskiy2007-12-261-1/+8
| | | | | | | | | | This is one more step on the way to "removable" UBI devices. It adds reference counting for UBI devices. Every time a volume on this device is opened - the device's refcount is increased. It is also increased if someone is reading any sysfs file of this UBI device or of one of its volumes. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: add UBI control deviceArtem Bityutskiy2007-12-261-1/+2
| | | | | | | | | | | | | | | | | This patch is a preparation to make UBI devices dynamic. It adds an UBI control device which has dynamically allocated major number and registers itself as "ubi_ctrl". It does not do anything so far. The idea is that this device will allow to attach/detach MTD devices from userspace. This is symilar to what the Linux device mapper has. The next things to do are: * Fix UBI, because it now assumes UBI devices cannot go away * Implement control device ioctls which will attach/detach MTD devices Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix ubi_wl_flushArtem Bityutskiy2007-12-261-0/+1
| | | | | | | | | | | The flush function should finish all the pending jobs. But if somebody else is doing a work, this function should wait and let it finish. This patche uses rw semaphore for synchronization purpose - it just looks quite convinient. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: bugfix: protect from volume removalArtem Bityutskiy2007-12-261-4/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When the WL worker is moving an LEB, the volume might go away occasionally. UBI does not handle these situations correctly. This patch introduces a new mutex which serializes wear-levelling worker and the the 'ubi_wl_put_peb()' function. Now, if one puts an LEB, and its PEB is being moved, it will wait on the mutex. And because we unmap all LEBs when removing volumes, this will make the volume remove function to wait while the LEB movement finishes. Below is an example of an oops which should be fixed by this patch: Pid: 9167, comm: io_paral Not tainted (2.6.24-rc5-ubi-2.6.git #2) EIP: 0060:[<f884a379>] EFLAGS: 00010246 CPU: 0 EIP is at prot_tree_del+0x2a/0x63 [ubi] EAX: f39a90e0 EBX: 00000000 ECX: 00000000 EDX: 00000134 ESI: f39a90e0 EDI: f39a90e0 EBP: f2d55ddc ESP: f2d55dd4 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068 Process io_paral (pid: 9167, ti=f2d54000 task=f72a8030 task.ti=f2d54000) Stack: f39a95f8 ef6aae50 f2d55e08 f884a511 f88538e1 f884ecea 00000134 00000000 f39a9604 f39a95f0 efea8280 00000000 f39a90e0 f2d55e40 f8847261 f8850c3c f884eaad 00000001 000000b9 00000134 00000172 000000b9 00000134 00000001 Call Trace: [<c0105227>] show_trace_log_lvl+0x1a/0x30 [<c01052e2>] show_stack_log_lvl+0xa5/0xca [<c01053d6>] show_registers+0xcf/0x21b [<c0105648>] die+0x126/0x224 [<c0119a62>] do_page_fault+0x27f/0x60d [<c037dd62>] error_code+0x72/0x78 [<f884a511>] ubi_wl_put_peb+0xf0/0x191 [ubi] [<f8847261>] ubi_eba_unmap_leb+0xaf/0xcc [ubi] [<f8843c21>] ubi_remove_volume+0x102/0x1e8 [ubi] [<f8846077>] ubi_cdev_ioctl+0x22a/0x383 [ubi] [<c017d768>] do_ioctl+0x68/0x71 [<c017d7c6>] vfs_ioctl+0x55/0x271 [<c017da15>] sys_ioctl+0x33/0x52 [<c0104152>] sysenter_past_esp+0x5f/0xa5 ======================= Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: introduce volume refcountingArtem Bityutskiy2007-12-261-11/+11
| | | | | | | | Add ref_count field to UBI volumes and remove weired "vol->removed" field. This way things are better understandable and we do not have to do whold show_attr operation under spinlock. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: tweak volumes lockingArtem Bityutskiy2007-12-261-2/+3
| | | | | | | Transform vtbl_mutex to volumes_mutex - this just makes code easier to understand. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: improve internal interfacesArtem Bityutskiy2007-12-261-10/+11
| | | | | | | | Pass volume description object to the EBA function which makes more sense, and EBA function do not have to find the volume description object by volume ID. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: remove ubi_devices_cntArtem Bityutskiy2007-12-261-3/+1
| | | | | | This global variablea is not really needed, remove it Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: create ubi_wl_entry slab on initializationArtem Bityutskiy2007-12-261-0/+17
| | | | | | | Similarly to ltree_entry_slab, it makes more sense to create and destroy ubi_wl_entry slab on module initialization/exit. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: create ltree_entry slab on initializationArtem Bityutskiy2007-12-261-0/+23
| | | | | | | | Since the ltree_entry slab cache is a global entity, which is used by all UBI devices, it is more logical to create it on module initialization time and destro on module exit time. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: remove redundant fieldArtem Bityutskiy2007-12-261-2/+0
| | | | | | | Remove redundant ubi->major field - we have it in ubi->cdev.dev already. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: fix atomic LEB change problemsArtem Bityutskiy2007-10-141-2/+4
| | | | | | | | | | | | | | | | | | | | When the UBI device is nearly full, i.e. all LEBs are mapped, we have only one spare LEB left - the one we reserved for WL purposes. Well, I do not count the LEBs which were reserved for bad PEB handling - suppose NOR flash for simplicity. If an "atomic LEB change operation" is run, and the WL unit is moving a LEB, we have no spare LEBs to finish the operation and fail, which is not good. Moreover, if there are 2 or more simultanious "atomic LEB change" requests, only one of them has chances to succeed, the other will fail with -ENOSPC. Not good either. This patch does 2 things: 1. Reserves one PEB for the "atomic LEB change" operation. 2. Serealize the operations so that only on of them may run at a time (by means of a mutex). Pointed-to-by: Brijesh Singh <brijesh.s.singh@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
* UBI: do not use vmalloc on I/O pathArtem Bityutskiy2007-10-141-8/+22
| | | | | | | | | | | Similar reason as in case of the previous patch: it causes deadlocks if a filesystem with writeback support works on top of UBI. So pre-allocate needed buffers when attaching MTD device. We also need mutexes to protect the buffers, but they do not cause much contantion because they are used in recovery, torture, and WL copy routines, which are called seldom. Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
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