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authorChristoph Hellwig <hch@lst.de>2008-02-08 04:20:26 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-08 09:22:34 -0800
commit8b88b0998e35d239e74446cc30f354bdab86df89 (patch)
treec13773b744cf12b1e30ec9336a4acaf21e46c6d9 /virt
parentefae09f3e99fcc1bdead7bc23a508b3bade3f82f (diff)
downloadlinux-linaro-8b88b0998e35d239e74446cc30f354bdab86df89.tar.gz
libfs: allow error return from simple attributes
Sometimes simple attributes might need to return an error, e.g. for acquiring a mutex interruptibly. In fact we have that situation in spufs already which is the original user of the simple attributes. This patch merged the temporarily forked attributes in spufs back into the main ones and allows to return errors. [akpm@linux-foundation.org: build fix] Signed-off-by: Christoph Hellwig <hch@lst.de> Cc: <stefano.brivio@polimi.it> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Greg KH <greg@kroah.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3c4fe26096f..32fbf800696 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1186,38 +1186,38 @@ static struct notifier_block kvm_cpu_notifier = {
.priority = 20, /* must be > scheduler priority */
};
-static u64 vm_stat_get(void *_offset)
+static int vm_stat_get(void *_offset, u64 *val)
{
unsigned offset = (long)_offset;
- u64 total = 0;
struct kvm *kvm;
+ *val = 0;
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
- total += *(u32 *)((void *)kvm + offset);
+ *val += *(u32 *)((void *)kvm + offset);
spin_unlock(&kvm_lock);
- return total;
+ return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
-static u64 vcpu_stat_get(void *_offset)
+static int vcpu_stat_get(void *_offset, u64 *val)
{
unsigned offset = (long)_offset;
- u64 total = 0;
struct kvm *kvm;
struct kvm_vcpu *vcpu;
int i;
+ *val = 0;
spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
vcpu = kvm->vcpus[i];
if (vcpu)
- total += *(u32 *)((void *)vcpu + offset);
+ *val += *(u32 *)((void *)vcpu + offset);
}
spin_unlock(&kvm_lock);
- return total;
+ return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");