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-rw-r--r--fs/fs-writeback.c17
-rw-r--r--include/linux/writeback.h1
2 files changed, 18 insertions, 0 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 49bc1b8e8f19..f6c2155e0026 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1187,6 +1187,23 @@ void writeback_inodes_sb(struct super_block *sb)
1187EXPORT_SYMBOL(writeback_inodes_sb); 1187EXPORT_SYMBOL(writeback_inodes_sb);
1188 1188
1189/** 1189/**
1190 * writeback_inodes_sb_if_idle - start writeback if none underway
1191 * @sb: the superblock
1192 *
1193 * Invoke writeback_inodes_sb if no writeback is currently underway.
1194 * Returns 1 if writeback was started, 0 if not.
1195 */
1196int writeback_inodes_sb_if_idle(struct super_block *sb)
1197{
1198 if (!writeback_in_progress(sb->s_bdi)) {
1199 writeback_inodes_sb(sb);
1200 return 1;
1201 } else
1202 return 0;
1203}
1204EXPORT_SYMBOL(writeback_inodes_sb_if_idle);
1205
1206/**
1190 * sync_inodes_sb - sync sb inode pages 1207 * sync_inodes_sb - sync sb inode pages
1191 * @sb: the superblock 1208 * @sb: the superblock
1192 * 1209 *
diff --git a/include/linux/writeback.h b/include/linux/writeback.h
index c18c008f4bbf..76e8903cd204 100644
--- a/include/linux/writeback.h
+++ b/include/linux/writeback.h
@@ -70,6 +70,7 @@ struct writeback_control {
70struct bdi_writeback; 70struct bdi_writeback;
71int inode_wait(void *); 71int inode_wait(void *);
72void writeback_inodes_sb(struct super_block *); 72void writeback_inodes_sb(struct super_block *);
73int writeback_inodes_sb_if_idle(struct super_block *);
73void sync_inodes_sb(struct super_block *); 74void sync_inodes_sb(struct super_block *);
74void writeback_inodes_wbc(struct writeback_control *wbc); 75void writeback_inodes_wbc(struct writeback_control *wbc);
75long wb_do_writeback(struct bdi_writeback *wb, int force_wait); 76long wb_do_writeback(struct bdi_writeback *wb, int force_wait);