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-rw-r--r--include/linux/fs.h19
1 files changed, 19 insertions, 0 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 3ae8e37..047bde3 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -213,6 +213,7 @@ extern int dir_notify_enable;
#include <linux/radix-tree.h>
#include <linux/prio_tree.h>
#include <linux/init.h>
+#include <linux/sched.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
@@ -822,16 +823,34 @@ enum {
#define vfs_check_frozen(sb, level) \
wait_event((sb)->s_wait_unfrozen, ((sb)->s_frozen < (level)))
+static inline void get_fs_excl(void)
+{
+ atomic_inc(&current->fs_excl);
+}
+
+static inline void put_fs_excl(void)
+{
+ atomic_dec(&current->fs_excl);
+}
+
+static inline int has_fs_excl(void)
+{
+ return atomic_read(&current->fs_excl);
+}
+
+
/*
* Superblock locking.
*/
static inline void lock_super(struct super_block * sb)
{
+ get_fs_excl();
down(&sb->s_lock);
}
static inline void unlock_super(struct super_block * sb)
{
+ put_fs_excl();
up(&sb->s_lock);
}
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