exec: move de_thread()->setmax_mm_hiwater_rss() into exec_mmap()

[firefly-linux-kernel-4.4.55.git] / fs / super.c

diff --git a/fs/super.c b/fs/super.c
index 6015c02296b7ad2adba75c7946b8fb4762a62265..6277ec6cb60a65e71b2c590260c67a057a1748ca 100644 (file)
--- a/fs/super.c
+++ b/fs/super.c
@@ -633,6 +633,28 @@ rescan:
 
 EXPORT_SYMBOL(get_super);
 
+/**
+ *     get_super_thawed - get thawed superblock of a device
+ *     @bdev: device to get the superblock for
+ *
+ *     Scans the superblock list and finds the superblock of the file system
+ *     mounted on the device. The superblock is returned once it is thawed
+ *     (or immediately if it was not frozen). %NULL is returned if no match
+ *     is found.
+ */
+struct super_block *get_super_thawed(struct block_device *bdev)
+{
+       while (1) {
+               struct super_block *s = get_super(bdev);
+               if (!s || s->s_frozen == SB_UNFROZEN)
+                       return s;
+               up_read(&s->s_umount);
+               vfs_check_frozen(s, SB_FREEZE_WRITE);
+               put_super(s);
+       }
+}
+EXPORT_SYMBOL(get_super_thawed);
+
 /**
  * get_active_super - get an active reference to the superblock of a device
  * @bdev: device to get the superblock for