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ovl: Initialize ovl_inode->redirect in ovl_get_inode()

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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>
This commit is contained in:
Vivek Goyal 2018-05-11 11:49:27 -04:00 committed by Miklos Szeredi
parent 0c31d675aa
commit 9cec54c83a
3 changed files with 5 additions and 7 deletions
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3
fs/overlayfs/inode.c
View File

@ -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) ||

8
fs/overlayfs/namei.c
View File

@ -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);

1
fs/overlayfs/overlayfs.h
View File

@ -335,6 +335,7 @@ 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,