Merge tag 'v3.10.105' into update

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / fs / super.c

diff --git a/fs/super.c b/fs/super.c
index 9dd933795df4878697aea6b354a2eb44596b09ea..70fad569249aa58838e175f0b139a5344271cbc5 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -78,6 +78,8 @@ static int prune_super(struct shrinker *shrink, struct shrink_control *sc)
 
        total_objects = sb->s_nr_dentry_unused +
                        sb->s_nr_inodes_unused + fs_objects + 1;
+       if (!total_objects)
+               total_objects = 1;
 
        if (sc->nr_to_scan) {
                int     dentries;
@@ -163,19 +165,6 @@ static struct super_block *alloc_super(struct file_system_type *type, int flags)
                        s = NULL;
                        goto out;
                }
-#ifdef CONFIG_SMP
-               s->s_files = alloc_percpu(struct list_head);
-               if (!s->s_files)
-                       goto err_out;
-               else {
-                       int i;
-
-                       for_each_possible_cpu(i)
-                               INIT_LIST_HEAD(per_cpu_ptr(s->s_files, i));
-               }
-#else
-               INIT_LIST_HEAD(&s->s_files);
-#endif
                if (init_sb_writers(s, type))
                        goto err_out;
                s->s_flags = flags;
@@ -225,10 +214,6 @@ out:
        return s;
 err_out:
        security_sb_free(s);
-#ifdef CONFIG_SMP
-       if (s->s_files)
-               free_percpu(s->s_files);
-#endif
        destroy_sb_writers(s);
        kfree(s);
        s = NULL;
@@ -243,9 +228,6 @@ err_out:
  */
 static inline void destroy_super(struct super_block *s)
 {
-#ifdef CONFIG_SMP
-       free_percpu(s->s_files);
-#endif
        destroy_sb_writers(s);
        security_sb_free(s);
        WARN_ON(!list_empty(&s->s_mounts));
@@ -727,7 +709,8 @@ int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
           make sure there are no rw files opened */
        if (remount_ro) {
                if (force) {
-                       mark_files_ro(sb);
+                       sb->s_readonly_remount = 1;
+                       smp_wmb();
                } else {
                        retval = sb_prepare_remount_readonly(sb);
                        if (retval)
@@ -1350,8 +1333,8 @@ int freeze_super(struct super_block *sb)
                }
        }
        /*
-        * This is just for debugging purposes so that fs can warn if it
-        * sees write activity when frozen is set to SB_FREEZE_COMPLETE.
+        * For debugging purposes so that fs can warn if it sees write activity
+        * when frozen is set to SB_FREEZE_COMPLETE, and for thaw_super().
         */
        sb->s_writers.frozen = SB_FREEZE_COMPLETE;
        up_write(&sb->s_umount);
@@ -1370,7 +1353,7 @@ int thaw_super(struct super_block *sb)
        int error;
 
        down_write(&sb->s_umount);
-       if (sb->s_writers.frozen == SB_UNFROZEN) {
+       if (sb->s_writers.frozen != SB_FREEZE_COMPLETE) {
                up_write(&sb->s_umount);
                return -EINVAL;
        }