thaw_super() hold a write lock, however we wish to also enable
callers which already hold the write lock. To do this provide a helper
and make thaw_super() use it. This way, all that thaw_super() does
now is lock handling and active count management.
This change has no functional changes.
Suggested-by: Dave Chinner <david@xxxxxxxxxxxxx>
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxxxx>
---
fs/super.c | 39 ++++++++++++++++++++++++++-------------
1 file changed, 26 insertions(+), 13 deletions(-)
diff --git a/fs/super.c b/fs/super.c
index a7650ff22f0e..cecc279beecd 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1493,21 +1493,13 @@ int freeze_super(struct super_block *sb)
}
EXPORT_SYMBOL(freeze_super);
-/**
- * thaw_super -- unlock filesystem
- * @sb: the super to thaw
- *
- * Unlocks the filesystem and marks it writeable again after freeze_super().
- */
-int thaw_super(struct super_block *sb)
+/* Caller takes lock and handles active count */
+static int thaw_locked_super(struct super_block *sb)
{
int error;
- down_write(&sb->s_umount);
- if (sb->s_writers.frozen != SB_FREEZE_COMPLETE) {
- up_write(&sb->s_umount);
+ if (sb->s_writers.frozen != SB_FREEZE_COMPLETE)
return -EINVAL;
- }
if (sb_rdonly(sb)) {
sb->s_writers.frozen = SB_UNFROZEN;
@@ -1522,7 +1514,6 @@ int thaw_super(struct super_block *sb)
printk(KERN_ERR
"VFS:Filesystem thaw failed\n");
lockdep_sb_freeze_release(sb);
- up_write(&sb->s_umount);
return error;
}
}
@@ -1531,7 +1522,29 @@ int thaw_super(struct super_block *sb)
sb_freeze_unlock(sb);
out:
wake_up(&sb->s_writers.wait_unfrozen);
- deactivate_locked_super(sb);
return 0;
}
+
+/**
+ * thaw_super -- unlock filesystem
+ * @sb: the super to thaw
+ *
+ * Unlocks the filesystem and marks it writeable again after freeze_super().
+ */
+int thaw_super(struct super_block *sb)
+{
+ int error;
+
+ down_write(&sb->s_umount);
+ error = thaw_locked_super(sb);
+ if (error) {
+ up_write(&sb->s_umount);
+ goto out;
+ }
+
+ deactivate_locked_super(sb);
+
+out:
+ return error;
+}
EXPORT_SYMBOL(thaw_super);
--
2.15.0
--
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