linux-toradex.git/drivers/mtd/ubi/fastmap.c, branch v4.1.10 Linux kernel for Apalis and Colibri modules UBI: Fastmap: Wire up WL accessor functions 2015-03-26T21:47:35+00:00 Richard Weinberger richard@nod.at 2014-10-28T15:24:27+00:00 c5c3f3cf969e45c53345283fce0ba11fae7abd32 Use the new WL accessor functions in fastmap. Signed-off-by: Richard Weinberger <richard@nod.at> 
Use the new WL accessor functions in fastmap.

Signed-off-by: Richard Weinberger <richard@nod.at>
UBI: Fastmap: Add self check to detect absent PEBs 2015-03-26T21:46:05+00:00 Richard Weinberger richard@nod.at 2014-09-22T13:36:40+00:00 daef3dd1f0ae71bf04a32af4ef643baf040bb73d 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> 
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>
UBI: Fastmap: Rework fastmap error paths 2015-03-26T21:46:03+00:00 Richard Weinberger richard@nod.at 2014-11-10T15:11:40+00:00 5ca97ad83800938e8aeea622821a26d69d2052bf 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> 
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>
UBI: Fastmap: Prepare for variable sized fastmaps 2015-03-26T21:46:02+00:00 Richard Weinberger richard@nod.at 2014-10-29T15:59:32+00:00 61de74ce2fa2cc9eee85cf5edc6525b12831b507 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> 
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>
UBI: Fastmap: Locking updates 2015-03-26T21:46:02+00:00 Richard Weinberger richard@nod.at 2014-11-10T15:28:08+00:00 111ab0b26fc1bfad575d1e376e146d194d261e22 a) Rename ubi->fm_sem to ubi->fm_eba_sem as this semaphore protects EBA changes. b) Turn ubi->fm_mutex into a rw semaphore. It will still serialize fastmap writes but also ensures that ubi_wl_put_peb() is not interrupted by a fastmap write. We use a rw semaphore to allow ubi_wl_put_peb() still to be executed in parallel if no fastmap write is happening. Signed-off-by: Richard Weinberger <richard@nod.at> 
a) Rename ubi->fm_sem to ubi->fm_eba_sem as this semaphore
protects EBA changes.
b) Turn ubi->fm_mutex into a rw semaphore. It will still serialize
fastmap writes but also ensures that ubi_wl_put_peb() is not
interrupted by a fastmap write. We use a rw semaphore to allow
ubi_wl_put_peb() still to be executed in parallel if no fastmap
write is happening.

Signed-off-by: Richard Weinberger <richard@nod.at>
UBI: Fastmap: Set used_ebs only for static volumes 2015-03-26T21:46:01+00:00 Richard Weinberger richard@nod.at 2014-10-25T11:26:49+00:00 42dd3cdcd6b5671ebedc3df76ca8dcc3473bcc67 If we set it for dynamic ones we might confuse various self checks. Signed-off-by: Richard Weinberger <richard@nod.at> 
If we set it for dynamic ones we might confuse various self checks.

Signed-off-by: Richard Weinberger <richard@nod.at>
UBI: Fastmap: Fix leb_count unbalance 2015-03-26T21:46:00+00:00 Richard Weinberger richard@nod.at 2014-10-24T13:22:05+00:00 ad3d6a05ee45eebf68ff08da0d3f86251b530a27 If a LEB is unmapped we have to decrement leb_count as well. Signed-off-by: Richard Weinberger <richard@nod.at> 
If a LEB is unmapped we have to decrement leb_count as well.

Signed-off-by: Richard Weinberger <richard@nod.at>
UBI: Fastmap: Switch to ro mode if invalidate_fastmap() fails 2015-03-26T21:45:59+00:00 Richard Weinberger richard@nod.at 2014-10-07T19:45:19+00:00 2d93fb3632755c170bc684989709e28ef3d22a80 We have to switch to ro mode to guarantee that upon next UBI attach all data is consistent. Signed-off-by: Richard Weinberger <richard@nod.at> 
We have to switch to ro mode to guarantee that upon next UBI attach
all data is consistent.

Signed-off-by: Richard Weinberger <richard@nod.at>
UBI: Fastmap: Remove eba_orphans logic 2015-03-26T21:45:59+00:00 Richard Weinberger richard@nod.at 2014-10-07T19:39:20+00:00 d141a8ef21ab496ab6f8d188dfe7ca33e16fe798 This logic is in vain as we treat protected PEBs also as used, so this case must not happen. If a PEB is found which is in the EBA table but not known as used has to be issued as fatal error. Signed-off-by: Richard Weinberger <richard@nod.at> 
This logic is in vain as we treat protected PEBs also as used, so this
case must not happen.
If a PEB is found which is in the EBA table but not known as used
has to be issued as fatal error.

Signed-off-by: Richard Weinberger <richard@nod.at>
UBI: Fastmap: Remove bogus ubi_assert() 2015-03-26T21:45:58+00:00 Richard Weinberger richard@nod.at 2014-10-07T16:51:07+00:00 a83832a7c8d023f446ec865926190951bd18a4b1 It is legal to have PEBs left in the used list. This can happen if UBI copies a PEB and a powercut happens between writing a new fastmap and adding this PEB into the EBA table. In this case the old PEB will be used. Signed-off-by: Richard Weinberger <richard@nod.at> 
It is legal to have PEBs left in the used list.
This can happen if UBI copies a PEB and a powercut happens
between writing a new fastmap and adding this PEB into the EBA table.
In this case the old PEB will be used.

Signed-off-by: Richard Weinberger <richard@nod.at>