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Subject[PATCH 12/12] Unionfs: lock parent dentry branch config in write
Date
Ensure that branch configuration is available to file_revalidate should a
copyup be required.

Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---
fs/unionfs/file.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)

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;
--
1.5.2.2


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