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-rw-r--r--fs/sync.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/fs/sync.c b/fs/sync.c
index ba76b9623e7e..c38ec163da6c 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>
@@ -33,7 +34,7 @@ static int __sync_filesystem(struct super_block *sb, int wait)
* This should be safe, as we require bdi backing to actually
* write out data in the first place
*/
- if (!sb->s_bdi || sb->s_bdi == &noop_backing_dev_info)
+ if (sb->s_bdi == &noop_backing_dev_info)
return 0;
if (sb->s_qcop && sb->s_qcop->quota_sync)
@@ -79,7 +80,7 @@ EXPORT_SYMBOL_GPL(sync_filesystem);
static void sync_one_sb(struct super_block *sb, void *arg)
{
- if (!(sb->s_flags & MS_RDONLY) && sb->s_bdi)
+ if (!(sb->s_flags & MS_RDONLY))
__sync_filesystem(sb, *(int *)arg);
}
/*
@@ -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