Add more vmalloc fallbacks to memory allocations

Hi,

inspired by a recent fix where we tried to kmalloc a 64k nodesize buffer, without the vmalloc fallback, and failed. This series add the "kmalloc-first and vmalloc-fallback" logic to more places, namely to the buffers used during send. If the memory is not fragmented, kmalloc succeeds and does not take the resources required for the mappings.

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The following changes since commit 56f23fdbb600e6087db7b009775b95ce07cc3195:

Btrfs: fix file/data loss caused by fsync after rename and new inode (2016-04-06 17:01:44 -0700)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git dev/kvalloc

for you to fetch changes up to c3e3930516c4d14ed1d6d70964fbc4f3faa36844:

btrfs: clone: use vmalloc only as fallback for nodesize bufer (2016-04-11 19:06:39 +0200)

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David Sterba (6):
btrfs: send: use vmalloc only as fallback for send_buf
btrfs: send: use vmalloc only as fallback for read_buf
btrfs: send: use temporary variable to store allocation size
btrfs: send: use vmalloc only as fallback for clone_roots
btrfs: send: use vmalloc only as fallback for clone_sources_tmp
btrfs: clone: use vmalloc only as fallback for nodesize bufer

 fs/btrfs/ioctl.c | 13 ++++++++-----
 fs/btrfs/send.c  | 56 +++++++++++++++++++++++++++++++++++---------------------
 2 files changed, 43 insertions(+), 26 deletions(-)

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