UBIFS: fix file-system synchronization

Argh. The ->sync_fs call is called _before_ all inodes are flushed.
This means we first sync write buffers and commit, then all
inodes are synced, and we end up with unflushed write buffers!

Fix this by forcing synching all indoes from 'ubifs_sync_fs()'.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 13097830e8bce58b843bb70ad33cda772659fb80..471301799c52cc94f5c70e43ade04c11f814070c 100644 (file)
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -35,6 +35,7 @@
 #include <linux/seq_file.h>
 #include <linux/mount.h>
 #include <linux/math64.h>
+#include <linux/writeback.h>
 #include "ubifs.h"
 
 /*
@@ -431,6 +432,23 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
        struct ubifs_info *c = sb->s_fs_info;
        int i, ret = 0, err;
        long long bud_bytes;
+       struct writeback_control wbc = {
+               .sync_mode   = wait ? WB_SYNC_ALL : WB_SYNC_HOLD,
+               .range_start = 0,
+               .range_end   = LLONG_MAX,
+               .nr_to_write = LONG_MAX,
+       };
+
+       /*
+        * VFS calls '->sync_fs()' before synchronizing all dirty inodes and
+        * pages, so synchronize them first, then commit the journal. Strictly
+        * speaking, it is not necessary to commit the journal here,
+        * synchronizing write-buffers would be enough. But committing makes
+        * UBIFS free space predictions much more accurate, so we want to let
+        * the user be able to get more accurate results of 'statfs()' after
+        * they synchronize the file system.
+        */
+       generic_sync_sb_inodes(sb, &wbc);
 
        if (c->jheads) {
                for (i = 0; i < c->jhead_cnt; i++) {