#include <linux/cleancache.h>
#include "internal.h"
+static void clear_exceptional_entry(struct address_space *mapping,
+ pgoff_t index, void *entry)
+{
+ struct radix_tree_node *node;
+ void **slot;
+
+ /* Handled by shmem itself */
+ if (shmem_mapping(mapping))
+ return;
+
+ spin_lock_irq(&mapping->tree_lock);
+ /*
+ * Regular page slots are stabilized by the page lock even
+ * without the tree itself locked. These unlocked entries
+ * need verification under the tree lock.
+ */
+ if (!__radix_tree_lookup(&mapping->page_tree, index, &node, &slot))
+ goto unlock;
+ if (*slot != entry)
+ goto unlock;
+ radix_tree_replace_slot(slot, NULL);
+ mapping->nrshadows--;
+ if (!node)
+ goto unlock;
+ workingset_node_shadows_dec(node);
+ /*
+ * Don't track node without shadow entries.
+ *
+ * Avoid acquiring the list_lru lock if already untracked.
+ * The list_empty() test is safe as node->private_list is
+ * protected by mapping->tree_lock.
+ */
+ if (!workingset_node_shadows(node) &&
+ !list_empty(&node->private_list))
+ list_lru_del(&workingset_shadow_nodes, &node->private_list);
+ __radix_tree_delete_node(&mapping->page_tree, node);
+unlock:
+ spin_unlock_irq(&mapping->tree_lock);
+}
/**
* do_invalidatepage - invalidate part or all of a page
unsigned int partial_start; /* inclusive */
unsigned int partial_end; /* exclusive */
struct pagevec pvec;
+ pgoff_t indices[PAGEVEC_SIZE];
pgoff_t index;
int i;
cleancache_invalidate_inode(mapping);
- if (mapping->nrpages == 0)
+ if (mapping->nrpages == 0 && mapping->nrshadows == 0)
return;
/* Offsets within partial pages */
pagevec_init(&pvec, 0);
index = start;
- while (index < end && pagevec_lookup(&pvec, mapping, index,
- min(end - index, (pgoff_t)PAGEVEC_SIZE))) {
+ while (index < end && pagevec_lookup_entries(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE),
+ indices)) {
mem_cgroup_uncharge_start();
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
/* We rely upon deletion not changing page->index */
- index = page->index;
+ index = indices[i];
if (index >= end)
break;
+ if (radix_tree_exceptional_entry(page)) {
+ clear_exceptional_entry(mapping, index, page);
+ continue;
+ }
+
if (!trylock_page(page))
continue;
WARN_ON(page->index != index);
truncate_inode_page(mapping, page);
unlock_page(page);
}
+ pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
mem_cgroup_uncharge_end();
cond_resched();
index = start;
for ( ; ; ) {
cond_resched();
- if (!pagevec_lookup(&pvec, mapping, index,
- min(end - index, (pgoff_t)PAGEVEC_SIZE))) {
+ if (!pagevec_lookup_entries(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE),
+ indices)) {
if (index == start)
break;
index = start;
continue;
}
- if (index == start && pvec.pages[0]->index >= end) {
+ if (index == start && indices[0] >= end) {
+ pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
break;
}
struct page *page = pvec.pages[i];
/* We rely upon deletion not changing page->index */
- index = page->index;
+ index = indices[i];
if (index >= end)
break;
+ if (radix_tree_exceptional_entry(page)) {
+ clear_exceptional_entry(mapping, index, page);
+ continue;
+ }
+
lock_page(page);
WARN_ON(page->index != index);
wait_on_page_writeback(page);
truncate_inode_page(mapping, page);
unlock_page(page);
}
+ pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
mem_cgroup_uncharge_end();
index++;
}
EXPORT_SYMBOL(truncate_inode_pages);
+/**
+ * truncate_inode_pages_final - truncate *all* pages before inode dies
+ * @mapping: mapping to truncate
+ *
+ * Called under (and serialized by) inode->i_mutex.
+ *
+ * Filesystems have to use this in the .evict_inode path to inform the
+ * VM that this is the final truncate and the inode is going away.
+ */
+void truncate_inode_pages_final(struct address_space *mapping)
+{
+ unsigned long nrshadows;
+ unsigned long nrpages;
+
+ /*
+ * Page reclaim can not participate in regular inode lifetime
+ * management (can't call iput()) and thus can race with the
+ * inode teardown. Tell it when the address space is exiting,
+ * so that it does not install eviction information after the
+ * final truncate has begun.
+ */
+ mapping_set_exiting(mapping);
+
+ /*
+ * When reclaim installs eviction entries, it increases
+ * nrshadows first, then decreases nrpages. Make sure we see
+ * this in the right order or we might miss an entry.
+ */
+ nrpages = mapping->nrpages;
+ smp_rmb();
+ nrshadows = mapping->nrshadows;
+
+ if (nrpages || nrshadows) {
+ /*
+ * As truncation uses a lockless tree lookup, cycle
+ * the tree lock to make sure any ongoing tree
+ * modification that does not see AS_EXITING is
+ * completed before starting the final truncate.
+ */
+ spin_lock_irq(&mapping->tree_lock);
+ spin_unlock_irq(&mapping->tree_lock);
+
+ truncate_inode_pages(mapping, 0);
+ }
+}
+EXPORT_SYMBOL(truncate_inode_pages_final);
+
/**
* invalidate_mapping_pages - Invalidate all the unlocked pages of one inode
* @mapping: the address_space which holds the pages to invalidate
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
+ pgoff_t indices[PAGEVEC_SIZE];
struct pagevec pvec;
pgoff_t index = start;
unsigned long ret;
*/
pagevec_init(&pvec, 0);
- while (index <= end && pagevec_lookup(&pvec, mapping, index,
- min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
+ indices)) {
mem_cgroup_uncharge_start();
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
/* We rely upon deletion not changing page->index */
- index = page->index;
+ index = indices[i];
if (index > end)
break;
+ if (radix_tree_exceptional_entry(page)) {
+ clear_exceptional_entry(mapping, index, page);
+ continue;
+ }
+
if (!trylock_page(page))
continue;
WARN_ON(page->index != index);
deactivate_page(page);
count += ret;
}
+ pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
mem_cgroup_uncharge_end();
cond_resched();
goto failed;
BUG_ON(page_has_private(page));
- __delete_from_page_cache(page);
+ __delete_from_page_cache(page, NULL);
spin_unlock_irq(&mapping->tree_lock);
mem_cgroup_uncharge_cache_page(page);
int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end)
{
+ pgoff_t indices[PAGEVEC_SIZE];
struct pagevec pvec;
pgoff_t index;
int i;
cleancache_invalidate_inode(mapping);
pagevec_init(&pvec, 0);
index = start;
- while (index <= end && pagevec_lookup(&pvec, mapping, index,
- min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1)) {
+ while (index <= end && pagevec_lookup_entries(&pvec, mapping, index,
+ min(end - index, (pgoff_t)PAGEVEC_SIZE - 1) + 1,
+ indices)) {
mem_cgroup_uncharge_start();
for (i = 0; i < pagevec_count(&pvec); i++) {
struct page *page = pvec.pages[i];
/* We rely upon deletion not changing page->index */
- index = page->index;
+ index = indices[i];
if (index > end)
break;
+ if (radix_tree_exceptional_entry(page)) {
+ clear_exceptional_entry(mapping, index, page);
+ continue;
+ }
+
lock_page(page);
WARN_ON(page->index != index);
if (page->mapping != mapping) {
ret = ret2;
unlock_page(page);
}
+ pagevec_remove_exceptionals(&pvec);
pagevec_release(&pvec);
mem_cgroup_uncharge_end();
cond_resched();
projects / cascardo / linux.git / blobdiff