summaryrefslogtreecommitdiffstats
path: root/mm/shmem.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/shmem.c')
-rw-r--r--mm/shmem.c62
1 files changed, 50 insertions, 12 deletions
diff --git a/mm/shmem.c b/mm/shmem.c
index aa47e6b..b1b20dc 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -300,18 +300,19 @@ void shmem_uncharge(struct inode *inode, long pages)
static int shmem_radix_tree_replace(struct address_space *mapping,
pgoff_t index, void *expected, void *replacement)
{
+ struct radix_tree_node *node;
void **pslot;
void *item;
VM_BUG_ON(!expected);
VM_BUG_ON(!replacement);
- pslot = radix_tree_lookup_slot(&mapping->page_tree, index);
- if (!pslot)
+ item = __radix_tree_lookup(&mapping->page_tree, index, &node, &pslot);
+ if (!item)
return -ENOENT;
- item = radix_tree_deref_slot_protected(pslot, &mapping->tree_lock);
if (item != expected)
return -ENOENT;
- radix_tree_replace_slot(pslot, replacement);
+ __radix_tree_replace(&mapping->page_tree, node, pslot,
+ replacement, NULL, NULL);
return 0;
}
@@ -370,6 +371,7 @@ static bool shmem_confirm_swap(struct address_space *mapping,
int shmem_huge __read_mostly;
+#if defined(CONFIG_SYSFS) || defined(CONFIG_TMPFS)
static int shmem_parse_huge(const char *str)
{
if (!strcmp(str, "never"))
@@ -407,6 +409,7 @@ static const char *shmem_format_huge(int huge)
return "bad_val";
}
}
+#endif
static unsigned long shmem_unused_huge_shrink(struct shmem_sb_info *sbinfo,
struct shrink_control *sc, unsigned long nr_to_split)
@@ -658,8 +661,8 @@ unsigned long shmem_partial_swap_usage(struct address_space *mapping,
swapped++;
if (need_resched()) {
+ slot = radix_tree_iter_resume(slot, &iter);
cond_resched_rcu();
- slot = radix_tree_iter_next(&iter);
}
}
@@ -1046,6 +1049,30 @@ static void shmem_evict_inode(struct inode *inode)
clear_inode(inode);
}
+static unsigned long find_swap_entry(struct radix_tree_root *root, void *item)
+{
+ struct radix_tree_iter iter;
+ void **slot;
+ unsigned long found = -1;
+ unsigned int checked = 0;
+
+ rcu_read_lock();
+ radix_tree_for_each_slot(slot, root, &iter, 0) {
+ if (*slot == item) {
+ found = iter.index;
+ break;
+ }
+ checked++;
+ if ((checked % 4096) != 0)
+ continue;
+ slot = radix_tree_iter_resume(slot, &iter);
+ cond_resched_rcu();
+ }
+
+ rcu_read_unlock();
+ return found;
+}
+
/*
* If swap found in inode, free it and move page from swapcache to filecache.
*/
@@ -1059,7 +1086,7 @@ static int shmem_unuse_inode(struct shmem_inode_info *info,
int error = 0;
radswap = swp_to_radix_entry(swap);
- index = radix_tree_locate_item(&mapping->page_tree, radswap);
+ index = find_swap_entry(&mapping->page_tree, radswap);
if (index == -1)
return -EAGAIN; /* tell shmem_unuse we found nothing */
@@ -1539,7 +1566,7 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index,
struct mm_struct *fault_mm, int *fault_type)
{
struct address_space *mapping = inode->i_mapping;
- struct shmem_inode_info *info;
+ struct shmem_inode_info *info = SHMEM_I(inode);
struct shmem_sb_info *sbinfo;
struct mm_struct *charge_mm;
struct mem_cgroup *memcg;
@@ -1589,7 +1616,6 @@ repeat:
* Fast cache lookup did not find it:
* bring it back from swap or allocate.
*/
- info = SHMEM_I(inode);
sbinfo = SHMEM_SB(inode->i_sb);
charge_mm = fault_mm ? : current->mm;
@@ -1837,7 +1863,6 @@ unlock:
put_page(page);
}
if (error == -ENOSPC && !once++) {
- info = SHMEM_I(inode);
spin_lock_irq(&info->lock);
shmem_recalc_inode(inode);
spin_unlock_irq(&info->lock);
@@ -1848,6 +1873,18 @@ unlock:
return error;
}
+/*
+ * This is like autoremove_wake_function, but it removes the wait queue
+ * entry unconditionally - even if something else had already woken the
+ * target.
+ */
+static int synchronous_wake_function(wait_queue_t *wait, unsigned mode, int sync, void *key)
+{
+ int ret = default_wake_function(wait, mode, sync, key);
+ list_del_init(&wait->task_list);
+ return ret;
+}
+
static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct inode *inode = file_inode(vma->vm_file);
@@ -1883,7 +1920,7 @@ static int shmem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
vmf->pgoff >= shmem_falloc->start &&
vmf->pgoff < shmem_falloc->next) {
wait_queue_head_t *shmem_falloc_waitq;
- DEFINE_WAIT(shmem_fault_wait);
+ DEFINE_WAIT_FUNC(shmem_fault_wait, synchronous_wake_function);
ret = VM_FAULT_NOPAGE;
if ((vmf->flags & FAULT_FLAG_ALLOW_RETRY) &&
@@ -2434,8 +2471,8 @@ static void shmem_tag_pins(struct address_space *mapping)
}
if (need_resched()) {
+ slot = radix_tree_iter_resume(slot, &iter);
cond_resched_rcu();
- slot = radix_tree_iter_next(&iter);
}
}
rcu_read_unlock();
@@ -2504,8 +2541,8 @@ static int shmem_wait_for_pins(struct address_space *mapping)
spin_unlock_irq(&mapping->tree_lock);
continue_resched:
if (need_resched()) {
+ slot = radix_tree_iter_resume(slot, &iter);
cond_resched_rcu();
- slot = radix_tree_iter_next(&iter);
}
}
rcu_read_unlock();
@@ -2665,6 +2702,7 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
spin_lock(&inode->i_lock);
inode->i_private = NULL;
wake_up_all(&shmem_falloc_waitq);
+ WARN_ON_ONCE(!list_empty(&shmem_falloc_waitq.task_list));
spin_unlock(&inode->i_lock);
error = 0;
goto out;
OpenPOWER on IntegriCloud