ext4: remove ext4_ioend_wait()

Now that we clear PageWriteback after extent conversion, there's no
need to wait for io_end processing in ext4_evict_inode().  Running
AIO/DIO keeps file reference until aio_complete() is called so
ext4_evict_inode() cannot be called.  For io_end structures resulting
from buffered IO waiting is happening because we wait for
PageWriteback in truncate_inode_pages().

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

3 files changed, 3 insertions, 22 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index be95c83f5875..bd9890f6d9ce 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2651,7 +2651,6 @@ extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
 /* page-io.c */
 extern int __init ext4_init_pageio(void);
 extern void ext4_exit_pageio(void);
-extern void ext4_ioend_shutdown(struct inode *);
 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
 extern int ext4_put_io_end(ext4_io_end_t *io_end);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index de6dd77f0c56..442c5d2e0978 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -215,7 +215,8 @@ void ext4_evict_inode(struct inode *inode)
                         filemap_write_and_wait(&inode->i_data);
                 }
                 truncate_inode_pages(&inode->i_data, 0);
-                ext4_ioend_shutdown(inode);
+
+                WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
                 goto no_delete;
         }
 
@@ -225,8 +226,8 @@ void ext4_evict_inode(struct inode *inode)
         if (ext4_should_order_data(inode))
                 ext4_begin_ordered_truncate(inode, 0);
         truncate_inode_pages(&inode->i_data, 0);
-        ext4_ioend_shutdown(inode);
 
+        WARN_ON(atomic_read(&EXT4_I(inode)->i_ioend_count));
         if (is_bad_inode(inode))
                 goto no_delete;
 
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 6ee5bd389405..ce8c15a7eabc 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -46,25 +46,6 @@ void ext4_exit_pageio(void)
 }
 
 /*
- * This function is called by ext4_evict_inode() to make sure there is
- * no more pending I/O completion work left to do.
- */
-void ext4_ioend_shutdown(struct inode *inode)
-{
-        wait_queue_head_t *wq = ext4_ioend_wq(inode);
-
-        wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_ioend_count) == 0));
-        /*
-         * We need to make sure the work structure is finished being
-         * used before we let the inode get destroyed.
-         */
-        if (work_pending(&EXT4_I(inode)->i_rsv_conversion_work))
-                cancel_work_sync(&EXT4_I(inode)->i_rsv_conversion_work);
-        if (work_pending(&EXT4_I(inode)->i_unrsv_conversion_work))
-                cancel_work_sync(&EXT4_I(inode)->i_unrsv_conversion_work);
-}
-
-/*
  * Print an buffer I/O error compatible with the fs/buffer.c.  This
  * provides compatibility with dmesg scrapers that look for a specific
  * buffer I/O error message.  We really need a unified error reporting