f2fs: avoid to wait all the node blocks during fsync

Previously, f2fs_sync_file() waits for all the node blocks to be written.
But, we don't need to do that, but wait only the inode-related node blocks.

This patch adds wait_on_node_pages_writeback() in which waits inode-related
node blocks that are on writeback.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 6aaefdb..625eb4b 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1026,6 +1026,7 @@ void get_node_info(struct f2fs_sb_info *, nid_t, struct node_info *);
 int get_dnode_of_data(struct dnode_of_data *, pgoff_t, int);
 int truncate_inode_blocks(struct inode *, pgoff_t);
 int truncate_xattr_node(struct inode *, struct page *);
+int wait_on_node_pages_writeback(struct f2fs_sb_info *, nid_t);
 int remove_inode_page(struct inode *);
 struct page *new_inode_page(struct inode *, const struct qstr *);
 struct page *new_node_page(struct dnode_of_data *, unsigned int, struct page *);

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 58ed19a..7d714f4 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -189,8 +189,9 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
                        if (ret)
                                goto out;
                }
-               filemap_fdatawait_range(sbi->node_inode->i_mapping,
-                                                       0, LONG_MAX);
+               ret = wait_on_node_pages_writeback(sbi, inode->i_ino);
+               if (ret)
+                       goto out;
                ret = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
        }
 out:

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 8e331d5..b527ed4 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1148,6 +1148,46 @@ continue_unlock:
        return nwritten;
 }
 
+int wait_on_node_pages_writeback(struct f2fs_sb_info *sbi, nid_t ino)
+{
+       struct address_space *mapping = sbi->node_inode->i_mapping;
+       pgoff_t index = 0, end = LONG_MAX;
+       struct pagevec pvec;
+       int nr_pages;
+       int ret2 = 0, ret = 0;
+
+       pagevec_init(&pvec, 0);
+       while ((index <= end) &&
+                       (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index,
+                       PAGECACHE_TAG_WRITEBACK,
+                       min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1)) != 0) {
+               unsigned i;
+
+               for (i = 0; i < nr_pages; i++) {
+                       struct page *page = pvec.pages[i];
+
+                       /* until radix tree lookup accepts end_index */
+                       if (page->index > end)
+                               continue;
+
+                       if (ino && ino_of_node(page) == ino)
+                               wait_on_page_writeback(page);
+                       if (TestClearPageError(page))
+                               ret = -EIO;
+               }
+               pagevec_release(&pvec);
+               cond_resched();
+       }
+
+       if (test_and_clear_bit(AS_ENOSPC, &mapping->flags))
+               ret2 = -ENOSPC;
+       if (test_and_clear_bit(AS_EIO, &mapping->flags))
+               ret2 = -EIO;
+       if (!ret)
+               ret = ret2;
+       return ret;
+}
+
 static int f2fs_write_node_page(struct page *page,
                                struct writeback_control *wbc)
 {