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Revision f104d044376aadcee74605d66b8d9dc2e145782c authored by Josef Bacik on 14 October 2011, 17:56:58 UTC, committed by Josef Bacik on 19 October 2011, 19:12:57 UTC 
Btrfs: wait for ordered extents if we're in trouble when shrinking delalloc
 
The only way we actually reclaim delalloc space is waiting for the IO to
completely finish.  Usually we kick off a bunch of IO and wait for a little bit
and hope we can make our reservation, and usually this works out pretty well.
With overcommit however we can get seriously underwater if we're filling up the
disk quickly, so we need to be able to force the delalloc shrinker to wait for
the ordered IO to finish to give us a better chance of actually reclaiming
enough space to get our reservation.  Thanks,

Signed-off-by: Josef Bacik <josef@redhat.com>
1 parent bbb495c
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Makefile-i386 
core-y += arch/um/sys-i386/ arch/x86/crypto/

TOP_ADDR := $(CONFIG_TOP_ADDR)

START := 0x8048000

LDFLAGS			+= -m elf_i386
ELF_ARCH		:= $(SUBARCH)
ELF_FORMAT 		:= elf32-$(SUBARCH)
OBJCOPYFLAGS  		:= -O binary -R .note -R .comment -S
HEADER_ARCH		:= x86
CHECKFLAGS	+= -D__i386__

ifeq ("$(origin SUBARCH)", "command line")
ifneq ("$(shell uname -m | sed -e s/i.86/i386/)", "$(SUBARCH)")
KBUILD_CFLAGS		+= $(call cc-option,-m32)
KBUILD_AFLAGS		+= $(call cc-option,-m32)
LINK-y			+= $(call cc-option,-m32)
UML_OBJCOPYFLAGS	+= -F $(ELF_FORMAT)

export LDFLAGS HOSTCFLAGS HOSTLDFLAGS UML_OBJCOPYFLAGS
endif
endif

# First of all, tune CFLAGS for the specific CPU. This actually sets cflags-y.
include $(srctree)/arch/x86/Makefile_32.cpu

# prevent gcc from keeping the stack 16 byte aligned. Taken from i386.
cflags-y += $(call cc-option,-mpreferred-stack-boundary=2)

# Prevent sprintf in nfsd from being converted to strcpy and resulting in
# an unresolved reference.
cflags-y += -ffreestanding

# Disable unit-at-a-time mode on pre-gcc-4.0 compilers, it makes gcc use
# a lot more stack due to the lack of sharing of stacklots.  Also, gcc
# 4.3.0 needs -funit-at-a-time for extern inline functions.
KBUILD_CFLAGS += $(shell if [ $(call cc-version) -lt 0400 ] ; then \
			echo $(call cc-option,-fno-unit-at-a-time); \
			else echo $(call cc-option,-funit-at-a-time); fi ;)

KBUILD_CFLAGS += $(cflags-y)
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