• Joel Reardon's avatar
    UBI: modify ubi_wl_flush function to clear work queue for a lnum · 62f38455
    Joel Reardon authored
    This patch modifies ubi_wl_flush to force the erasure of
    particular volume id / logical eraseblock number pairs. Previous functionality
    is preserved when passing UBI_ALL for both values. The locations where ubi_wl_flush
    were called are appropriately changed: ubi_leb_erase only flushes for the
    erased LEB, and ubi_create_volume forces only flushing for its volume id.
    External code can call this new feature via the new function ubi_flush() added
    to kapi.c, which simply passes through to ubi_wl_flush().
    
    This was tested by disabling the call to do_work in ubi thread, which results
    in the work queue remaining unless explicitly called to remove. UBIFS was
    changed to call ubifs_leb_change 50 times for four different LEBs. Then the
    new function was called to clear the queue: passing wrong volume ids / lnum,
    correct ones, and finally UBI_ALL for both to ensure it was finally all
    cleard. The work queue was dumped each time and the selective removal
    of the particular LEB numbers was observed. Extra checks were enabled and
    ubifs's integck was also run. Finally, the drive was repeatedly filled and
    emptied to ensure that the queue was cleared normally.
    
    Artem: amended the patch.
    Signed-off-by: default avatarJoel Reardon <reardonj@inf.ethz.ch>
    Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
    62f38455
kapi.c 22.9 KB