commit 09ef07c8ea574a9c8a3cd4df205e1442f344bf3b
Author: Erez Zadok <[EMAIL PROTECTED]>
Date: Wed Apr 23 19:13:27 2008 -0400
Unionfs: lock parent dentry branch config in write
Ensure that branch configuration is available to file_revalidate should a
copyup be required.
Signed-off-by: Erez Zadok <[EMAIL PROTECTED]>
diff --git a/fs/unionfs/file.c b/fs/unionfs/file.c
index 09f594d..9b5fc58 100644
--- a/fs/unionfs/file.c
+++ b/fs/unionfs/file.c
@@ -55,7 +55,9 @@ static ssize_t unionfs_write(struct file *file, const char
__user *buf,
unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_PARENT);
unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
- err = unionfs_file_revalidate(file, true);
+ if (dentry != dentry->d_parent)
+ unionfs_lock_dentry(dentry->d_parent, UNIONFS_DMUTEX_PARENT);
+ err = unionfs_file_revalidate_locked(file, true);
if (unlikely(err))
goto out;
@@ -72,6 +74,8 @@ static ssize_t unionfs_write(struct file *file, const char
__user *buf,
}
out:
+ if (dentry != dentry->d_parent)
+ unionfs_unlock_dentry(dentry->d_parent);
unionfs_unlock_dentry(dentry);
unionfs_read_unlock(dentry->d_sb);
return err;
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