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-rw-r--r--fs/sync.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/sync.c b/fs/sync.c
index ba76b96..92ca208 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -7,6 +7,7 @@
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/module.h>
+#include <linux/namei.h>
#include <linux/sched.h>
#include <linux/writeback.h>
#include <linux/syscalls.h>
@@ -128,6 +129,29 @@ void emergency_sync(void)
}
}
+/*
+ * sync a single super
+ */
+SYSCALL_DEFINE1(syncfs, int, fd)
+{
+ struct file *file;
+ struct super_block *sb;
+ int ret;
+ int fput_needed;
+
+ file = fget_light(fd, &fput_needed);
+ if (!file)
+ return -EBADF;
+ sb = file->f_dentry->d_sb;
+
+ down_read(&sb->s_umount);
+ ret = sync_filesystem(sb);
+ up_read(&sb->s_umount);
+
+ fput_light(file, fput_needed);
+ return ret;
+}
+
/**
* vfs_fsync_range - helper to sync a range of data & metadata to disk
* @file: file to sync
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