inc_wb_stat(new_wb, WB_WRITEBACK);
}
+ if (mapping_tagged(mapping, PAGECACHE_TAG_WRITEBACK)) {
+ atomic_dec(&old_wb->writeback_inodes);
+ atomic_inc(&new_wb->writeback_inodes);
+ }
+
wb_get(new_wb);
/*
* cgroup_writeback_by_id - initiate cgroup writeback from bdi and memcg IDs
* @bdi_id: target bdi id
* @memcg_id: target memcg css id
- * @nr: number of pages to write, 0 for best-effort dirty flushing
* @reason: reason why some writeback work initiated
* @done: target wb_completion
*
* Initiate flush of the bdi_writeback identified by @bdi_id and @memcg_id
* with the specified parameters.
*/
-int cgroup_writeback_by_id(u64 bdi_id, int memcg_id, unsigned long nr,
+int cgroup_writeback_by_id(u64 bdi_id, int memcg_id,
enum wb_reason reason, struct wb_completion *done)
{
struct backing_dev_info *bdi;
struct cgroup_subsys_state *memcg_css;
struct bdi_writeback *wb;
struct wb_writeback_work *work;
+ unsigned long dirty;
int ret;
/* lookup bdi and memcg */
}
/*
- * If @nr is zero, the caller is attempting to write out most of
+ * The caller is attempting to write out most of
* the currently dirty pages. Let's take the current dirty page
* count and inflate it by 25% which should be large enough to
* flush out most dirty pages while avoiding getting livelocked by
* concurrent dirtiers.
+ *
+ * BTW the memcg stats are flushed periodically and this is best-effort
+ * estimation, so some potential error is ok.
*/
- if (!nr) {
- unsigned long filepages, headroom, dirty, writeback;
-
- mem_cgroup_wb_stats(wb, &filepages, &headroom, &dirty,
- &writeback);
- nr = dirty * 10 / 8;
- }
+ dirty = memcg_page_state(mem_cgroup_from_css(memcg_css), NR_FILE_DIRTY);
+ dirty = dirty * 10 / 8;
/* issue the writeback work */
work = kzalloc(sizeof(*work), GFP_NOWAIT | __GFP_NOWARN);
if (work) {
- work->nr_pages = nr;
+ work->nr_pages = dirty;
work->sync_mode = WB_SYNC_NONE;
work->range_cyclic = 1;
work->reason = reason;
static long wb_writeback(struct bdi_writeback *wb,
struct wb_writeback_work *work)
{
- unsigned long wb_start = jiffies;
long nr_pages = work->nr_pages;
unsigned long dirtied_before = jiffies;
struct inode *inode;
progress = __writeback_inodes_wb(wb, work);
trace_writeback_written(wb, work);
- wb_update_bandwidth(wb, wb_start);
-
/*
* Did we write something? Try for more
*
}
EXPORT_SYMBOL(write_inode_now);
-/**
- * sync_inode - write an inode and its pages to disk.
- * @inode: the inode to sync
- * @wbc: controls the writeback mode
- *
- * sync_inode() will write an inode and its pages to disk. It will also
- * correctly update the inode on its superblock's dirty inode lists and will
- * update inode->i_state.
- *
- * The caller must have a ref on the inode.
- */
-int sync_inode(struct inode *inode, struct writeback_control *wbc)
-{
- return writeback_single_inode(inode, wbc);
-}
-EXPORT_SYMBOL(sync_inode);
-
/**
* sync_inode_metadata - write an inode to disk
* @inode: the inode to sync
.nr_to_write = 0, /* metadata-only */
};
- return sync_inode(inode, &wbc);
+ return writeback_single_inode(inode, &wbc);
}
EXPORT_SYMBOL(sync_inode_metadata);