* ->inode_lock (zap_pte_range->set_page_dirty)
* ->private_lock (zap_pte_range->__set_page_dirty_buffers)
*
- * ->task->proc_lock
- * ->dcache_lock (proc_pid_lookup)
- *
* (code doesn't rely on that order, so you could switch it around)
* ->tasklist_lock (memory_failure, collect_procs_ao)
* ->i_mmap_lock
void remove_from_page_cache(struct page *page)
{
struct address_space *mapping = page->mapping;
+ void (*freepage)(struct page *);
BUG_ON(!PageLocked(page));
+ freepage = mapping->a_ops->freepage;
spin_lock_irq(&mapping->tree_lock);
__remove_from_page_cache(page);
spin_unlock_irq(&mapping->tree_lock);
mem_cgroup_uncharge_cache_page(page);
+
+ if (freepage)
+ freepage(page);
}
+EXPORT_SYMBOL(remove_from_page_cache);
static int sync_page(void *word)
{
/*
* Splice_read and readahead add shmem/tmpfs pages into the page cache
* before shmem_readpage has a chance to mark them as SwapBacked: they
- * need to go on the active_anon lru below, and mem_cgroup_cache_charge
+ * need to go on the anon lru below, and mem_cgroup_cache_charge
* (called in add_to_page_cache) needs to know where they're going too.
*/
if (mapping_cap_swap_backed(mapping))
if (page_is_file_cache(page))
lru_cache_add_file(page);
else
- lru_cache_add_active_anon(page);
+ lru_cache_add_anon(page);
}
return ret;
}
#ifdef CONFIG_NUMA
struct page *__page_cache_alloc(gfp_t gfp)
{
+ int n;
+ struct page *page;
+
if (cpuset_do_page_mem_spread()) {
- int n = cpuset_mem_spread_node();
- return alloc_pages_exact_node(n, gfp, 0);
+ get_mems_allowed();
+ n = cpuset_mem_spread_node();
+ page = alloc_pages_exact_node(n, gfp, 0);
+ put_mems_allowed();
+ return page;
}
return alloc_pages(gfp, 0);
}
TASK_UNINTERRUPTIBLE);
}
+int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
+ unsigned int flags)
+{
+ if (!(flags & FAULT_FLAG_ALLOW_RETRY)) {
+ __lock_page(page);
+ return 1;
+ } else {
+ up_read(&mm->mmap_sem);
+ wait_on_page_locked(page);
+ return 0;
+ }
+}
+
/**
* find_get_page - find and get a page reference
* @mapping: the address_space to search
pagep = radix_tree_lookup_slot(&mapping->page_tree, offset);
if (pagep) {
page = radix_tree_deref_slot(pagep);
- if (unlikely(!page || page == RADIX_TREE_RETRY))
+ if (unlikely(!page))
+ goto out;
+ if (radix_tree_deref_retry(page))
goto repeat;
if (!page_cache_get_speculative(page))
goto repeat;
}
}
+out:
rcu_read_unlock();
return page;
page = radix_tree_deref_slot((void **)pages[i]);
if (unlikely(!page))
continue;
- /*
- * this can only trigger if nr_found == 1, making livelock
- * a non issue.
- */
- if (unlikely(page == RADIX_TREE_RETRY))
+ if (radix_tree_deref_retry(page)) {
+ if (ret)
+ start = pages[ret-1]->index;
goto restart;
+ }
if (!page_cache_get_speculative(page))
goto repeat;
page = radix_tree_deref_slot((void **)pages[i]);
if (unlikely(!page))
continue;
- /*
- * this can only trigger if nr_found == 1, making livelock
- * a non issue.
- */
- if (unlikely(page == RADIX_TREE_RETRY))
+ if (radix_tree_deref_retry(page))
goto restart;
if (page->mapping == NULL || page->index != index)
page = radix_tree_deref_slot((void **)pages[i]);
if (unlikely(!page))
continue;
- /*
- * this can only trigger if nr_found == 1, making livelock
- * a non issue.
- */
- if (unlikely(page == RADIX_TREE_RETRY))
+ if (radix_tree_deref_retry(page))
goto restart;
if (!page_cache_get_speculative(page))
goto page_not_up_to_date;
if (!trylock_page(page))
goto page_not_up_to_date;
+ /* Did it get truncated before we got the lock? */
+ if (!page->mapping)
+ goto page_not_up_to_date_locked;
if (!mapping->a_ops->is_partially_uptodate(page,
desc, offset))
goto page_not_up_to_date_locked;
}
readpage:
+ /*
+ * A previous I/O error may have been due to temporary
+ * failures, eg. multipath errors.
+ * PG_error will be set again if readpage fails.
+ */
+ ClearPageError(page);
/* Start the actual read. The read will unlock the page. */
error = mapping->a_ops->readpage(filp, page);
* waiting for the lock.
*/
do_async_mmap_readahead(vma, ra, file, page, offset);
- lock_page(page);
-
- /* Did it get truncated? */
- if (unlikely(page->mapping != mapping)) {
- unlock_page(page);
- put_page(page);
- goto no_cached_page;
- }
} else {
/* No page in the page cache at all */
do_sync_mmap_readahead(vma, ra, file, offset);
count_vm_event(PGMAJFAULT);
ret = VM_FAULT_MAJOR;
retry_find:
- page = find_lock_page(mapping, offset);
+ page = find_get_page(mapping, offset);
if (!page)
goto no_cached_page;
}
+ if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) {
+ page_cache_release(page);
+ return ret | VM_FAULT_RETRY;
+ }
+
+ /* Did it get truncated? */
+ if (unlikely(page->mapping != mapping)) {
+ unlock_page(page);
+ put_page(page);
+ goto retry_find;
+ }
+ VM_BUG_ON(page->index != offset);
+
/*
* We have a locked page in the page cache, now we need to check
* that it's up-to-date. If not, it is going to be due to an error.
}
if (written > 0) {
- loff_t end = pos + written;
- if (end > i_size_read(inode) && !S_ISBLK(inode->i_mode)) {
- i_size_write(inode, end);
+ pos += written;
+ if (pos > i_size_read(inode) && !S_ISBLK(inode->i_mode)) {
+ i_size_write(inode, pos);
mark_inode_dirty(inode);
}
- *ppos = end;
+ *ppos = pos;
}
out:
return written;
do {
struct page *page;
- pgoff_t index; /* Pagecache index for current page */
unsigned long offset; /* Offset into pagecache page */
unsigned long bytes; /* Bytes to write to page */
size_t copied; /* Bytes copied from user */
void *fsdata;
offset = (pos & (PAGE_CACHE_SIZE - 1));
- index = pos >> PAGE_CACHE_SHIFT;
bytes = min_t(unsigned long, PAGE_CACHE_SIZE - offset,
iov_iter_count(i));
projects / linux-flexiantxendom0-natty.git / blobdiff