Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs

Pull f2fs bug fixes from Jaegeuk Kim:
 "This patch-set includes two major bug fixes:
   - incorrect IUsed provided by *df -i*, and
   - lookup failure of parent inodes in corner cases.

  [Other Bug Fixes]
   - Fix error handling routines
   - Trigger recovery process correctly
   - Resolve build failures due to missing header files

  [Etc]
   - Add a MAINTAINERS entry for f2fs
   - Fix and clean up variables, functions, and equations
   - Avoid warnings during compilation"

* tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs:
  f2fs: unify string length declarations and usage
  f2fs: clean up unused variables and return values
  f2fs: clean up the start_bidx_of_node function
  f2fs: remove unneeded variable from f2fs_sync_fs
  f2fs: fix fsync_inode list addition logic and avoid invalid access to memory
  f2fs: remove unneeded initialization of nr_dirty in dirty_seglist_info
  f2fs: handle error from f2fs_iget_nowait
  f2fs: fix equation of has_not_enough_free_secs()
  f2fs: add MAINTAINERS entry
  f2fs: return a default value for non-void function
  f2fs: invalidate the node page if allocation is failed
  f2fs: add missing #include <linux/prefetch.h>
  f2fs: do f2fs_balance_fs in front of dir operations
  f2fs: should recover orphan and fsync data
  f2fs: fix handling errors got by f2fs_write_inode
  f2fs: fix up f2fs_get_parent issue to retrieve correct parent inode number
  f2fs: fix wrong calculation on f_files in statfs
  f2fs: remove set_page_dirty for atomic f2fs_end_io_write

1 files changed, 6 insertions, 40 deletions

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 1b26e4ea101..de6240922b0 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -12,54 +12,23 @@
 #include <linux/f2fs_fs.h>
 #include <linux/bio.h>
 #include <linux/blkdev.h>
+#include <linux/prefetch.h>
 #include <linux/vmalloc.h>
 
 #include "f2fs.h"
 #include "segment.h"
 #include "node.h"
 
-static int need_to_flush(struct f2fs_sb_info *sbi)
-{
-	unsigned int pages_per_sec = (1 << sbi->log_blocks_per_seg) *
-			sbi->segs_per_sec;
-	int node_secs = ((get_pages(sbi, F2FS_DIRTY_NODES) + pages_per_sec - 1)
-		>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
-	int dent_secs = ((get_pages(sbi, F2FS_DIRTY_DENTS) + pages_per_sec - 1)
-		>> sbi->log_blocks_per_seg) / sbi->segs_per_sec;
-
-	if (sbi->por_doing)
-		return 0;
-
-	if (free_sections(sbi) <= (node_secs + 2 * dent_secs +
-						reserved_sections(sbi)))
-		return 1;
-	return 0;
-}
-
 /*
  * This function balances dirty node and dentry pages.
  * In addition, it controls garbage collection.
  */
 void f2fs_balance_fs(struct f2fs_sb_info *sbi)
 {
-	struct writeback_control wbc = {
-		.sync_mode = WB_SYNC_ALL,
-		.nr_to_write = LONG_MAX,
-		.for_reclaim = 0,
-	};
-
-	if (sbi->por_doing)
-		return;
-
 	/*
-	 * We should do checkpoint when there are so many dirty node pages
-	 * with enough free segments. After then, we should do GC.
+	 * We should do GC or end up with checkpoint, if there are so many dirty
+	 * dir/node pages without enough free segments.
 	 */
-	if (need_to_flush(sbi)) {
-		sync_dirty_dir_inodes(sbi);
-		sync_node_pages(sbi, 0, &wbc);
-	}
-
 	if (has_not_enough_free_secs(sbi)) {
 		mutex_lock(&sbi->gc_mutex);
 		f2fs_gc(sbi, 1);
@@ -631,7 +600,6 @@ static void f2fs_end_io_write(struct bio *bio, int err)
 			if (page->mapping)
 				set_bit(AS_EIO, &page->mapping->flags);
 			set_ckpt_flags(p->sbi->ckpt, CP_ERROR_FLAG);
-			set_page_dirty(page);
 		}
 		end_page_writeback(page);
 		dec_page_count(p->sbi, F2FS_WRITEBACK);
@@ -791,11 +759,10 @@ static int __get_segment_type(struct page *page, enum page_type p_type)
 		return __get_segment_type_2(page, p_type);
 	case 4:
 		return __get_segment_type_4(page, p_type);
-	case 6:
-		return __get_segment_type_6(page, p_type);
-	default:
-		BUG();
 	}
+	/* NR_CURSEG_TYPE(6) logs by default */
+	BUG_ON(sbi->active_logs != NR_CURSEG_TYPE);
+	return __get_segment_type_6(page, p_type);
 }
 
 static void do_write_page(struct f2fs_sb_info *sbi, struct page *page,
@@ -1608,7 +1575,6 @@ static int build_dirty_segmap(struct f2fs_sb_info *sbi)
 
 	for (i = 0; i < NR_DIRTY_TYPE; i++) {
 		dirty_i->dirty_segmap[i] = kzalloc(bitmap_size, GFP_KERNEL);
-		dirty_i->nr_dirty[i] = 0;
 		if (!dirty_i->dirty_segmap[i])
 			return -ENOMEM;
 	}