UBIFS: always commit in sync_fs

Always run commit in sync_fs, because even if the journal seems
to be almost empty, there may be a deletion which removes a large
file, which affects the index greatly. And because we want
better free space predictions after 'sync_fs()', we have to
commit.

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

1 files changed, 18 insertions, 20 deletions

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 471301799c52..ee8e7749eae1 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -429,9 +429,8 @@ static int ubifs_show_options(struct seq_file *s, struct vfsmount *mnt)
 
 static int ubifs_sync_fs(struct super_block *sb, int wait)
 {
+        int i, err;
         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,
@@ -439,6 +438,19 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
                 .nr_to_write = LONG_MAX,
         };
 
+        if (sb->s_flags & MS_RDONLY)
+                return 0;
+
+        /*
+         * Synchronize write buffers, because 'ubifs_run_commit()' does not
+         * do this if it waits for an already running commit.
+         */
+        for (i = 0; i < c->jhead_cnt; i++) {
+                err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
+                if (err)
+                        return err;
+        }
+
         /*
          * VFS calls '->sync_fs()' before synchronizing all dirty inodes and
          * pages, so synchronize them first, then commit the journal. Strictly
@@ -450,30 +462,16 @@ static int ubifs_sync_fs(struct super_block *sb, int wait)
          */
         generic_sync_sb_inodes(sb, &wbc);
 
-        if (c->jheads) {
-                for (i = 0; i < c->jhead_cnt; i++) {
-                        err = ubifs_wbuf_sync(&c->jheads[i].wbuf);
-                        if (err && !ret)
-                                ret = err;
-                }
-
-                /* Commit the journal unless it has too little data */
-                spin_lock(&c->buds_lock);
-                bud_bytes = c->bud_bytes;
-                spin_unlock(&c->buds_lock);
-                if (bud_bytes > c->leb_size) {
-                        err = ubifs_run_commit(c);
-                        if (err)
-                                return err;
-                }
-        }
+        err = ubifs_run_commit(c);
+        if (err)
+                return err;
 
         /*
          * We ought to call sync for c->ubi but it does not have one. If it had
          * it would in turn call mtd->sync, however mtd operations are
          * synchronous anyway, so we don't lose any sleep here.
          */
-        return ret;
+        return err;
 }
 
 /**