• Johannes Weiner's avatar
    mm + fs: store shadow entries in page cache · 91b0abe3
    Johannes Weiner authored
    Reclaim will be leaving shadow entries in the page cache radix tree upon
    evicting the real page.  As those pages are found from the LRU, an
    iput() can lead to the inode being freed concurrently.  At this point,
    reclaim must no longer install shadow pages because the inode freeing
    code needs to ensure the page tree is really empty.
    
    Add an address_space flag, AS_EXITING, that the inode freeing code sets
    under the tree lock before doing the final truncate.  Reclaim will check
    for this flag before installing shadow pages.
    Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
    Reviewed-by: default avatarRik van Riel <riel@redhat.com>
    Reviewed-by: default avatarMinchan Kim <minchan@kernel.org>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Bob Liu <bob.liu@oracle.com>
    Cc: Christoph Hellwig <hch@infradead.org>
    Cc: Dave Chinner <david@fromorbit.com>
    Cc: Greg Thelen <gthelen@google.com>
    Cc: Hugh Dickins <hughd@google.com>
    Cc: Jan Kara <jack@suse.cz>
    Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Cc: Luigi Semenzato <semenzato@google.com>
    Cc: Mel Gorman <mgorman@suse.de>
    Cc: Metin Doslu <metin@citusdata.com>
    Cc: Michel Lespinasse <walken@google.com>
    Cc: Ozgun Erdogan <ozgun@citusdata.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Roman Gushchin <klamm@yandex-team.ru>
    Cc: Ryan Mallon <rmallon@gmail.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Vlastimil Babka <vbabka@suse.cz>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    91b0abe3
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