[PATCH 0/7] Allocate structures on stack instead of kmalloc()

[Goldwyn Rodrigues <rgoldwyn@suse.de>]

Here are some structs which can be converted to allocation on stack in order
to save on post-checks on kmalloc() and kfree() each of them.

Sizes of the structures are also in the commit message in case you feel they
are too bit to be allocated on stack.

There are two more structs in ioctl.c which can be converted, but
I was not sure of them:

1. In create_snapshot(), pending_snapshot can be converted. pending_snapshot
   is used in the transaction.
2. In btrfs_ioctl_set_received_subvol_32, args64 can be converted, but args32
   cannot. All Pointers associated with memdup_user() can also be converted
   by using copy_from_user() instead. This would include many more structs.

Goldwyn Rodrigues (7):
  btrfs: Allocate walk_control on stack
  btrfs: Allocate file_ra_state on stack
  btrfs: Allocate btrfs_ioctl_get_subvol_info_args on stack
  btrfs: Allocate btrfs_ioctl_balance_args on stack
  btrfs: Allocate btrfs_ioctl_quota_rescan_args on stack
  btrfs: Allocate btrfs_ioctl_defrag_range_args on stack
  btrfs: Alloc backref_ctx on stack

 fs/btrfs/extent-tree.c      |  89 +++++++++++++-----------------
 fs/btrfs/free-space-cache.c |  12 ++---
 fs/btrfs/ioctl.c            | 105 ++++++++++++++----------------------
 fs/btrfs/send.c             |  29 ++++------
 4 files changed, 89 insertions(+), 146 deletions(-)