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2016-01-10mtd: ubi: wl: avoid erasing a PEB which is emptySebastian Siewior1-3/+18
wear_leveling_worker() currently unconditionally puts a PEB on erase in the error case even it just been taken from the free_list and never used. In case the PEB was never used it can be put back on the free list saving a precious erase cycle. v1…v2: - to_leb_clean -> dst_leb_clean - use the nested option for ensure_wear_leveling() - do_sync_erase() can't go -ENOMEM so we can just go into RO-mode now. Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-12-16mtd: ubi: don't leak e if schedule_erase() failsSebastian Siewior1-0/+1
If __erase_worker() fails to erase the EB and schedule_erase() fails as well to do anything about it then we go RO. But that is not a reason to leak the e argument here. Therefore clean up e. Cc: <stable@vger.kernel.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-12-16mtd: ubi: fixup error correction in do_sync_erase()Sebastian Siewior1-24/+28
Since fastmap we gained do_sync_erase(). This function can return an error and its error handling isn't obvious. First the memory allocation for struct ubi_work can fail and as such struct ubi_wl_entry is leaked. However if the memory allocation succeeds then the tail function takes care of the struct ubi_wl_entry. A free here could result in a double free. To make the error handling simpler, I split the tail function into one piece which does the work and another which frees the struct ubi_work which is passed as argument. As result do_sync_erase() can keep the struct on stack and we get rid of one error source. Cc: <stable@vger.kernel.org> Fixes: 8199b901a ("UBI: Add fastmap support to the WL sub-system") Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-12-16UBI: fix use of "VID" vs. "EC" in header self-checkBrian Norris1-1/+1
Looks like a typo, using UBI_EC_HDR_SIZE_CRC (note the "EC") to compute the CRC for the VID header. This shouldn't cause any functional change, as both structures are 64 bytes. Verified with: BUILD_BUG_ON(UBI_VID_HDR_SIZE_CRC != UBI_EC_HDR_SIZE_CRC); Reported here: http://lists.infradead.org/pipermail/linux-mtd/2013-September/048570.html Reported by: Bill Pringlemeir <bpringlemeir@gmail.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-12-16UBI: fix return error codeSudip Mukherjee1-1/+1
We are checking dfs_rootdir for error value or NULL. But in the conditional ternary operator we returned -ENODEV if dfs_rootdir contains an error value and returned PTR_ERR(dfs_rootdir) if dfs_rootdir is NULL. So in the case of dfs_rootdir being NULL we actually assigned 0 to err and returned it to the caller implying a success. Lets return -ENODEV when dfs_rootdir is NULL else return PTR_ERR(dfs_rootdir). Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-11-10Merge tag 'upstream-4.4-rc1' of git://git.infradead.org/linux-ubifsLinus Torvalds6-8/+35
Pull UBI/UBIFS updates from Richard Weinberger: - access time support for UBIFS by Dongsheng Yang - random cleanups and bug fixes all over the place * tag 'upstream-4.4-rc1' of git://git.infradead.org/linux-ubifs: ubifs: introduce UBIFS_ATIME_SUPPORT to ubifs ubifs: make ubifs_[get|set]xattr atomic UBIFS: Delete unnecessary checks before the function call "iput" UBI: Remove in vain semicolon UBI: Fastmap: Fix PEB array type UBIFS: Fix possible memory leak in ubifs_readdir() fs/ubifs: remove unnecessary new_valid_dev check ubi: fastmap: Implement produce_free_peb() UBIFS: print verbose message when rescanning a corrupted node UBIFS: call dbg_is_power_cut() instead of reading c->dbg->pc_happened UBI: drop null test before destroy functions UBI: Update comments to reflect UBI_METAONLY flag UBI: Fix debug message UBI: Fix typo in comment UBI: Fastmap: Simplify expression UBIFS: fix a typo in comment of ubifs_budget_req UBIFS: use kmemdup rather than duplicating its implementation
2015-11-07Merge branch 'for-linus' of ↵Linus Torvalds1-2/+2
git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial Pull trivial updates from Jiri Kosina: "Trivial stuff from trivial tree that can be trivially summed up as: - treewide drop of spurious unlikely() before IS_ERR() from Viresh Kumar - cosmetic fixes (that don't really affect basic functionality of the driver) for pktcdvd and bcache, from Julia Lawall and Petr Mladek - various comment / printk fixes and updates all over the place" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial: bcache: Really show state of work pending bit hwmon: applesmc: fix comment typos Kconfig: remove comment about scsi_wait_scan module class_find_device: fix reference to argument "match" debugfs: document that debugfs_remove*() accepts NULL and error values net: Drop unlikely before IS_ERR(_OR_NULL) mm: Drop unlikely before IS_ERR(_OR_NULL) fs: Drop unlikely before IS_ERR(_OR_NULL) drivers: net: Drop unlikely before IS_ERR(_OR_NULL) drivers: misc: Drop unlikely before IS_ERR(_OR_NULL) UBI: Update comments to reflect UBI_METAONLY flag pktcdvd: drop null test before destroy functions
2015-11-06UBI: Remove in vain semicolonRichard Weinberger1-1/+1
...found while browsing. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-11-06UBI: Fastmap: Fix PEB array typeEzequiel García1-1/+1
The PEB array is an array of __be32, so let's fix the scan_pool() prototype accordingly. Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-10-03ubi: fastmap: Implement produce_free_peb()Richard Weinberger1-0/+29
If fastmap requests a free PEB for a pool and UBI is busy with erasing PEBs we need to offer a function to wait for one. We can reuse produce_free_peb() from the non-fastmap WL code but with different locking semantics. Cc: stable@vger.kernel.org # 4.1.x- Reported-and-tested-by: Jörg Krause <joerg.krause@embedded.rocks> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-10-03UBI: drop null test before destroy functionsJulia Lawall1-3/+1
Remove unneeded NULL test. The semantic patch that makes this change is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ expression x; @@ -if (x != NULL) \(kmem_cache_destroy\|mempool_destroy\|dma_pool_destroy\)(x); // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-10-03UBI: Update comments to reflect UBI_METAONLY flagAndrew Murray1-2/+2
This patch trivially updates code comments to reflect the addition of the UBI_METAONLY flag - as discussed https://lkml.org/lkml/2014/10/29/764 Cc: Richard Weinberger <richard@nod.at> Cc: trivial@kernel.org Signed-off-by: Andrew Murray <amurray@embedded-bits.co.uk> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-10-03UBI: Fix debug messageRichard Weinberger1-1/+1
We have to use j instead of i. i is the volume id and not the block. Reported-by: Alexander.Block@continental-corporation.com Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Brian Norris <computersforpeace@gmail.com>
2015-10-03UBI: Fix typo in commentRichard Weinberger1-1/+1
While we are here fix a s/beween/between typo. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Brian Norris <computersforpeace@gmail.com>
2015-10-03UBI: Fastmap: Simplify expressionRichard Weinberger1-1/+1
There is no need to compute pnum again. Signed-off-by: Richard Weinberger <richard@nod.at> Acked-by: Brian Norris <computersforpeace@gmail.com>
2015-09-29UBI: Update comments to reflect UBI_METAONLY flagAndrew Murray1-2/+2
This patch trivially updates code comments to reflect the addition of the UBI_METAONLY flag - as discussed https://lkml.org/lkml/2014/10/29/764 Cc: Richard Weinberger <richard@nod.at> Cc: trivial@kernel.org Signed-off-by: Andrew Murray <amurray@embedded-bits.co.uk> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
2015-09-29UBI: return ENOSPC if no enough space availableshengyong2-0/+2
UBI: attaching mtd1 to ubi0 UBI: scanning is finished UBI error: init_volumes: not enough PEBs, required 706, available 686 UBI error: ubi_wl_init: no enough physical eraseblocks (-20, need 1) UBI error: ubi_attach_mtd_dev: failed to attach mtd1, error -12 <= NOT ENOMEM UBI error: ubi_init: cannot attach mtd1 If available PEBs are not enough when initializing volumes, return -ENOSPC directly. If available PEBs are not enough when initializing WL, return -ENOSPC instead of -ENOMEM. Cc: stable@vger.kernel.org Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: David Gstir <david@sigma-star.at>
2015-09-29UBI: Validate data_sizeRichard Weinberger1-0/+5
Make sure that data_size is less than LEB size. Otherwise a handcrafted UBI image is able to trigger an out of bounds memory access in ubi_compare_lebs(). Cc: stable@vger.kernel.org Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: David Gstir <david@sigma-star.at>
2015-07-01Merge tag 'modules-next-for-linus' of ↵Linus Torvalds1-1/+1
git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux Pull module updates from Rusty Russell: "Main excitement here is Peter Zijlstra's lockless rbtree optimization to speed module address lookup. He found some abusers of the module lock doing that too. A little bit of parameter work here too; including Dan Streetman's breaking up the big param mutex so writing a parameter can load another module (yeah, really). Unfortunately that broke the usual suspects, !CONFIG_MODULES and !CONFIG_SYSFS, so those fixes were appended too" * tag 'modules-next-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux: (26 commits) modules: only use mod->param_lock if CONFIG_MODULES param: fix module param locks when !CONFIG_SYSFS. rcu: merge fix for Convert ACCESS_ONCE() to READ_ONCE() and WRITE_ONCE() module: add per-module param_lock module: make perm const params: suppress unused variable error, warn once just in case code changes. modules: clarify CONFIG_MODULE_COMPRESS help, suggest 'N'. kernel/module.c: avoid ifdefs for sig_enforce declaration kernel/workqueue.c: remove ifdefs over wq_power_efficient kernel/params.c: export param_ops_bool_enable_only kernel/params.c: generalize bool_enable_only kernel/module.c: use generic module param operaters for sig_enforce kernel/params: constify struct kernel_param_ops uses sysfs: tightened sysfs permission checks module: Rework module_addr_{min,max} module: Use __module_address() for module_address_lookup() module: Make the mod_tree stuff conditional on PERF_EVENTS || TRACING module: Optimize __module_address() using a latched RB-tree rbtree: Implement generic latch_tree seqlock: Introduce raw_read_seqcount_latch() ...
2015-06-03UBI: Remove unnecessary `\'shengyong2-2/+2
Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: Use static class and attribute groupsTakashi Iwai3-142/+57
This patch cleans up the manual device_create_file() or class_create_file() calls by replacing with static attribute groups. It simplifies the code and also avoids the possible races between the device/class registration and sysfs creations. For the simplification, also make ubi_class a static instance with initializers, too. Amend a bit by Hujianyang. Signed-off-by: Takashi Iwai <tiwai@suse.de> Tested-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: hujianyang <hujianyang@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: add a helper function for updatting on-flash layout volumesshengyong1-21/+24
Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: Fastmap: Do not add vol if it already existsshengyong1-1/+8
During fastmap attaching, check if a volume already exists when adding the volume to volume tree. NOTE that the issue cannot happen, only if the on-flash fastmap data is modified. Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: Init vol->reserved_pebs by assignmentshengyong1-2/+2
`vol' is a newly allocated value by kzalloc. Initialize it by assignment instead of `+='. Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: Fastmap: Rename variables to make them meaningfulshengyong1-29/+29
s/fmpl1/fmpl s/fmpl2/fmpl_wl Add "WL" to the error message when wrong WL pool magic number is detected. Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: Fastmap: Remove unnecessary `\'shengyong1-7/+7
Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: Fastmap: Use max() to get the larger valueshengyong1-2/+2
Signed-off-by: Sheng Yong <shengyong1@huawei.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-06-02UBI: block: Dynamically allocate minor numbersDan Ehrenberg1-2/+14
This patch makes ubiblock devices have minor numbers beginning from 0, allocated dynamically independently of the ubi device/volume number. This property becomes useful because, on 32-bit architectures with LFS turned off in a userspace program, device minor numbers over 8 bits cause stat to return -EOVERFLOW. If the device number is high (>1) due to multiple MTD partitions, such an overflow will occur. While enabling LFS is clearly a nicer solution, it's often difficult to turn on in practice globally as many widely distributed packages don't work with LFS on. Other storage systems have their own workarounds, with SCSI making multiple device majors and MMC having a config option for the number of partitions per device. A completely dynamic minor numbering is simpler than these. It is unlikely that anyone is depending on a static minor number since the major is dynamic anyway. In addition, ubiblock is still relatively new, so now is the time to make such changes. Signed-off-by: Dan Ehrenberg <dehrenberg@chromium.org> Acked-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-05-28kernel/params: constify struct kernel_param_ops usesLuis R. Rodriguez1-1/+1
Most code already uses consts for the struct kernel_param_ops, sweep the kernel for the last offending stragglers. Other than include/linux/moduleparam.h and kernel/params.c all other changes were generated with the following Coccinelle SmPL patch. Merge conflicts between trees can be handled with Coccinelle. In the future git could get Coccinelle merge support to deal with patch --> fail --> grammar --> Coccinelle --> new patch conflicts automatically for us on patches where the grammar is available and the patch is of high confidence. Consider this a feature request. Test compiled on x86_64 against: * allnoconfig * allmodconfig * allyesconfig @ const_found @ identifier ops; @@ const struct kernel_param_ops ops = { }; @ const_not_found depends on !const_found @ identifier ops; @@ -struct kernel_param_ops ops = { +const struct kernel_param_ops ops = { }; Generated-by: Coccinelle SmPL Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Junio C Hamano <gitster@pobox.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Kees Cook <keescook@chromium.org> Cc: Tejun Heo <tj@kernel.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: cocci@systeme.lip6.fr Cc: linux-kernel@vger.kernel.org Signed-off-by: Luis R. Rodriguez <mcgrof@suse.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
2015-05-06UBI: block: Add missing cache flushesKevin Cernekee1-0/+2
Block drivers are responsible for calling flush_dcache_page() on each BIO request. This operation keeps the I$ coherent with the D$ on architectures that don't have hardware coherency support. Without this flush, random crashes are seen when executing user programs from an ext4 filesystem backed by a ubiblock device. This patch is based on the change implemented in commit 2d4dc890b5c8 ("block: add helpers to run flush_dcache_page() against a bio and a request's pages"). Fixes: 9d54c8a33eec ("UBI: R/O block driver on top of UBI volumes") Signed-off-by: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: Ezequiel Garcia <ezequiel.garcia@imgtec.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-04-26Merge branch 'for-linus' of ↵Linus Torvalds2-4/+4
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull fourth vfs update from Al Viro: "d_inode() annotations from David Howells (sat in for-next since before the beginning of merge window) + four assorted fixes" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: RCU pathwalk breakage when running into a symlink overmounting something fix I_DIO_WAKEUP definition direct-io: only inc/dec inode->i_dio_count for file systems fs/9p: fix readdir() VFS: assorted d_backing_inode() annotations VFS: fs/inode.c helpers: d_inode() annotations VFS: fs/cachefiles: d_backing_inode() annotations VFS: fs library helpers: d_inode() annotations VFS: assorted weird filesystems: d_inode() annotations VFS: normal filesystems (and lustre): d_inode() annotations VFS: security/: d_inode() annotations VFS: security/: d_backing_inode() annotations VFS: net/: d_inode() annotations VFS: net/unix: d_backing_inode() annotations VFS: kernel/: d_inode() annotations VFS: audit: d_backing_inode() annotations VFS: Fix up some ->d_inode accesses in the chelsio driver VFS: Cachefiles should perform fs modifications on the top layer only VFS: AF_UNIX sockets should call mknod on the top layer only
2015-04-15VFS: assorted d_backing_inode() annotationsDavid Howells2-4/+4
Signed-off-by: David Howells <dhowells@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2015-04-13UBI: power cut emulation for testingdavid.oberhollenzer@sigma-star.at4-2/+120
Emulate random power cuts by switching device to ro after a number of writes to allow simple power cut testing with nand-sim. Maximum and minimum number of successful writes before power cut and what kind of writes (EC header, VID header or none) to interrupt configurable via debugfs. Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Fall back to scanning mode after ECC errorRichard Weinberger1-1/+1
If we encounter an uncorrectable ECC error while scanning for the fastmap UBI must not fail hard. Instead fall back to scanning mode. Reported-by: Alexander Block <Alexander.Block@continental-corporation.com> Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Remove is_fm_block()Richard Weinberger3-29/+0
This function was added to fastmap in a very early stage to have paranoid assertions. With the current fastmap implementation this assert will never trigger as fastmap PEBs are not seen by the WL sub-system. Remove it to save us some CPU cycles. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Add blank line after declarationsRichard Weinberger1-0/+1
Another checkpatch complaint: WARNING: Missing a blank line after declarations Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Remove else after return.Richard Weinberger1-3/+3
checkpatch.pl complains: WARNING: else is not generally useful after a break or return Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Introduce may_reserve_for_fm()Richard Weinberger3-6/+28
...and kill another #ifdef. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Introduce ubi_fastmap_init()Richard Weinberger2-7/+8
...and kill another #ifdef in wl.c. :-) Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Wire up WL accessor functionsRichard Weinberger1-16/+12
Use the new WL accessor functions in fastmap. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Add accessor functions for WL data structuresRichard Weinberger1-0/+36
Fastmap need access to various WL data structures as fastmap tightly depends on WL. To make the access less invasive add accessor functions. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Move fastmap specific functions out of wl.cRichard Weinberger3-463/+476
Fastmap is tightly connected to the WL sub-system, many fastmap-specific functionslive in wl.c. To get rid of most #ifdefs in wl.c move this functions into a new file and include it into wl.c Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Add new module parameter fm_debugRichard Weinberger2-0/+10
If fm_debug is set fastmap debugging is enabled by default. This is useful if one wants to debug fastmap on an UBI device with serves the rootfs. The the UBI attach mechanism runs long before debugfs can be mounted and chk_fastmap set. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Make self_check_eba() depend on fastmap self checkingRichard Weinberger1-1/+1
...instead of generic self checking. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Add self check to detect absent PEBsRichard Weinberger1-2/+84
This self check allows Fastmap to detect absent PEBs while writing a new fastmap to the MTD device. It will help to find implementation issues in Fastmap. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fix stale pointers in ubi->lookuptblRichard Weinberger1-16/+31
In some error paths the WL sub-system gives up on a PEB and frees it's ubi_wl_entry struct but does not set the entry in ubi->lookuptbl to NULL. Fastmap can stumble over such a stale pointer as it uses ubi->lookuptbl to find all PEBs. Fix this by introducing a new helper function which free()s a WL entry and removes the reference from the lookup table. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Enhance fastmap checkingRichard Weinberger1-2/+5
Don't update the fastmap upon detach if fastmap checking is enabled. This is poor men's power cut testing feature. :-) Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Add initial support for fastmap self checksRichard Weinberger3-0/+20
Using this debugfs knob fastmap self checks can be controlled. Signed-off-by: Richard Weinberger <richard@nod.at> Reviewed-by: Tanya Brokhman <tlinder@codeaurora.org>
2015-03-26UBI: Fastmap: Rework fastmap error pathsRichard Weinberger1-48/+114
If UBI is unable to write the fastmap to the device we have make sure that upon next attach UBI will fall back to scanning mode. In case we cannot ensure that they only thing we can do is falling back to read-only mode. The current error handling code is not powercut proof. It could happen that a powercut while invalidating would lead to a state where an too old fastmap could be used upon attach. This patch addresses the issue by writing a fake fastmap super block to a fresh PEB instead of reerasing the existing one. The fake fastmap super block will UBI case to do a full scan. Signed-off-by: Richard Weinberger <richard@nod.at>
2015-03-26UBI: Fastmap: Prepare for variable sized fastmapsRichard Weinberger1-2/+10
The current code assumes that each fastmap has the same amount of PEBs. So far this is true but will change soon. Signed-off-by: Richard Weinberger <richard@nod.at>
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