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Subject[PATCH 01/28] ovl: Initialize ovl_inode->redirect in ovl_get_inode()
Date
From: Vivek Goyal <vgoyal@redhat.com>

ovl_inode->redirect is an inode property and should be initialized in
ovl_get_inode() only when we are adding a new inode to cache. If inode is
already in cache, it is already initialized and we should not be touching
ovl_inode->redirect field.

As of now this is not a problem as redirects are used only for directories
which don't share inode. But soon I want to use redirects for regular
files also and there it can become an issue.

Hence, move ->redirect initialization in ovl_get_inode().

Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
fs/overlayfs/inode.c | 3 +++
fs/overlayfs/namei.c | 8 +-------
fs/overlayfs/overlayfs.h | 1 +
3 files changed, 5 insertions(+), 7 deletions(-)

diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index cd46dd8e7e54..c365b94fa158 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -844,6 +844,7 @@ struct inode *ovl_get_inode(struct super_block *sb,
}

dput(upperdentry);
+ kfree(oip->redirect);
goto out;
}

@@ -867,6 +868,8 @@ struct inode *ovl_get_inode(struct super_block *sb,
if (oip->index)
ovl_set_flag(OVL_INDEX, inode);

+ OVL_I(inode)->redirect = oip->redirect;
+
/* Check for non-merge dir that may have whiteouts */
if (is_dir) {
if (((upperdentry && lowerdentry) || oip->numlower > 1) ||
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index 08801b45df00..54f206485ab8 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -1009,19 +1009,13 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
.lowerpath = stack,
.index = index,
.numlower = ctr,
+ .redirect = upperredirect,
};

inode = ovl_get_inode(dentry->d_sb, &oip);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_free_oe;
-
- /*
- * NB: handle redirected hard links when non-dir redirects
- * become possible
- */
- WARN_ON(OVL_I(inode)->redirect);
- OVL_I(inode)->redirect = upperredirect;
}

revert_creds(old_cred);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index be4f1664f662..1948e38c3c95 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -342,6 +342,7 @@ struct ovl_inode_params {
struct ovl_path *lowerpath;
struct dentry *index;
unsigned int numlower;
+ char *redirect;
};
struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
--
2.14.3
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