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-There is a potential for deadlock when allocating a struct sk_buff for
-data that needs to be written out to aoe storage. If the data is
-being written from a dirty page in order to free that page, and if
-there are no other pages available, then deadlock may occur when a
-free page is needed for the sk_buff allocation. This situation has
-not been observed, but it would be nice to eliminate any potential for
-deadlock under memory pressure.
-Because ATA over Ethernet is not fragmented by the kernel's IP code,
-the destructor member of the struct sk_buff is available to the aoe
-driver. By using a mempool for allocating all but the first few
-sk_buffs, and by registering a destructor, we should be able to
-efficiently allocate sk_buffs without introducing any potential for