Needed to maintain Unix semantics via utimes(2).
Signed-off-by: Erez Zadok <[email protected]>
---
fs/unionfs/inode.c | 12 ++++++++++++
1 files changed, 12 insertions(+), 0 deletions(-)
diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index ef61d9c..63ff3d3 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -1090,6 +1090,18 @@ static int unionfs_setattr(struct dentry *dentry, struct iattr *ia)
/* get the size from the first lower inode */
lower_inode = unionfs_lower_inode(inode);
unionfs_copy_attr_all(inode, lower_inode);
+ /*
+ * unionfs_copy_attr_all will copy the lower times to our inode if
+ * the lower ones are newer (useful for cache coherency). However,
+ * ->setattr is the only place in which we may have to copy the
+ * lower inode times absolutely, to support utimes(2).
+ */
+ if (ia->ia_valid & ATTR_MTIME_SET)
+ inode->i_mtime = lower_inode->i_mtime;
+ if (ia->ia_valid & ATTR_CTIME)
+ inode->i_ctime = lower_inode->i_ctime;
+ if (ia->ia_valid & ATTR_ATIME_SET)
+ inode->i_atime = lower_inode->i_atime;
fsstack_copy_inode_size(inode, lower_inode);
/* if setattr succeeded, then parent dir may have changed */
unionfs_copy_attr_times(dentry->d_parent->d_inode);
--
1.5.2.2
-
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