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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-05-24 14:13:34 +0300
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2009-06-02 13:53:35 +0300
commitb86a2c56e512f46d140a4bcb4e35e8a7d4a99a4b (patch)
tree59c3e036dfd767b73e700bd7fd8cb4bee15c4f58 /include/linux
parent87960c0b12d0c5a0b37e0c79aef77aa1a0b10d44 (diff)
UBI: do not switch to R/O mode on read errors
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>
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