linux-toradex.git/drivers/mtd/ubi/wl.c, branch v3.3.2

UBI: fix eraseblock picking criteria

2012-04-02T17:32:08+00:00

commit 7eb3aa65853e1b223bfc786b023b702018cb76c0 upstream.

The 'find_wl_entry()' function expects the maximum difference as the second
argument, not the maximum absolute value. So the "unknown" eraseblock picking
was incorrect, as Shmulik Ladkani spotted. This patch fixes the issue.

Reported-by: Shmulik Ladkani 
Signed-off-by: Artem Bityutskiy 
Reviewed-by: Shmulik Ladkani 
Signed-off-by: Greg Kroah-Hartman

UBI: fix use-after-free on error path

2012-01-05T09:19:19+00:00

When we fail to erase a PEB, we free the corresponding erase entry object,
but then re-schedule this object if the error code was something like -EAGAIN.
Obviously, it is a bug to use the object after we have freed it.

Reported-by: Emese Revfy 
Cc: stable@kernel.org [v2.6.23+]
Signed-off-by: Artem Bityutskiy

UBI: fix missing scrub when there is a bit-flip

2011-11-30T12:13:42+00:00

Under some cases, when scrubbing the PEB if we did not get the lock on
the PEB it fails to scrub. Add that PEB again to the scrub list

Artem: minor amendments.

Cc: stable@kernel.org [2.6.31+]
Signed-off-by: Bhavesh Parekh 
Signed-off-by: Artem Bityutskiy

UBI: prepare debugging stuff to further debugfs conversion

2011-06-01T08:21:52+00:00

We'll need the 'struct ubi_device *ubi' pointer in every debugging function (to
access the ->dbg field), so add this pointer to all the functions implementing
UBI debugging test modes like 'ubi_dbg_is_bitflip()' etc.

Signed-off-by: Artem Bityutskiy

UBI: use debugfs for the extra checks knobs

2011-06-01T08:21:47+00:00

This patch introduces debugfs support to UBI. All the UBI stuff is kept in the
"ubi" debugfs directory, which contains per-UBI device "ubi/ubiX"
sub-directories, containing debugging files. This file also creates
"ubi/ubiX/chk_gen" and "ubi/ubiX/chk_io" knobs for switching general and I/O
extra checks on and off. And it removes the 'debug_chks' UBI module parameters.

Signed-off-by: Artem Bityutskiy

UBI: change the interface of a debugging check function

2011-05-31T13:14:05+00:00

This is a minor preparational patch which changes the
'paranoid_check_in_wl_tree()' function interface by adding the 'ubi' parameter
which will be needed there in the next patch.

And while on it, add "const" qualifier to the 'ubi' parameter of the
'paranoid_check_in_pq()' function.

Signed-off-by: Artem Bityutskiy

UBI: fix minor stylistic issues

2011-04-14T08:34:41+00:00

Fix checkpatch.pl errors and warnings:

* space before tab
* line over 80 characters
* include linux/ioctl.h instead of asm/ioctl.h

Signed-off-by: Artem Bityutskiy

UBI: make tests modes dynamic

2011-03-16T11:50:17+00:00

Similarly to the debugging checks and message, make the test modes
be dynamically selected via the "debug_tsts" module parameter or
via the "/sys/module/ubi/parameters/debug_tsts" sysfs file. This
is consistent with UBIFS as well.

And now, since all the Kconfig knobs became dynamic, we can remove
the Kconfig.debug file completely.

Signed-off-by: Artem Bityutskiy

UBI: make self-checks dynamic

2011-03-16T11:50:16+00:00

This patch adds a possibility to dynamically switch UBI self-checks
on and off, instead of toggling them compile-time from the configuration
menu. This is much more flexible, and consistent with UBIFS, and this
also simplifies UBI Kconfig menu and the code.

This patch introduces two levels of self-checks - general, which
includes all self-checks which are relatively fast, and I/O, which
includes write-verify checks and erase-verify checks, which are
relatively slow and involve flash I/O.

Signed-off-by: Artem Bityutskiy

UBI: preserve corrupted PEBs

2010-10-19T14:19:57+00:00

Currently UBI erases all corrupted eraseblocks, irrespectively of the nature
of corruption: corruption due to power cuts and non-power cut corruption.
The former case is OK, but the latter is not, because UBI may destroy
potentially important data.

With this patch, during scanning, when UBI hits a PEB with corrupted VID
header, it checks whether this PEB contains only 0xFF data. If yes, it is
safe to erase this PEB and it is put to the 'erase' list. If not, this may
be important data and it is better to avoid erasing this PEB. Instead,
UBI puts it to the corr list and moves out of the pool of available PEB.
IOW, UBI preserves this PEB.

Such corrupted PEB lessen the amount of available PEBs. So the more of them
we accumulate, the less PEBs are available. The maximum amount of non-power
cut corrupted PEBs is 8.

This patch is a response to UBIFS problem where reporter
(Matthew L. Creech ) observes that UBIFS index points
to an unmapped LEB. The theory is that corresponding PEB somehow got
corrupted and UBI wiped it. This patch (actually a series of patches)
tries to make sure such PEBs are preserved - this would make it is easier
to analyze the corruption.

Signed-off-by: Artem Bityutskiy