• Hugh Dickins's avatar
    tmpfs: fix regression hang in fallocate undo · 7f556567
    Hugh Dickins authored
    The well-spotted fallocate undo fix is good in most cases, but not when
    fallocate failed on the very first page.  index 0 then passes lend -1
    to shmem_undo_range(), and that has two bad effects: (a) that it will
    undo every fallocation throughout the file, unrestricted by the current
    range; but more importantly (b) it can cause the undo to hang, because
    lend -1 is treated as truncation, which makes it keep on retrying until
    every page has gone, but those already fully instantiated will never go
    away.  Big thank you to xfstests generic/269 which demonstrates this.
    
    Fixes: b9b4bb26 ("tmpfs: don't undo fallocate past its last page")
    Cc: stable@vger.kernel.org
    Signed-off-by: default avatarHugh Dickins <hughd@google.com>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    7f556567
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