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| author | Amir Goldstein <amir73il@gmail.com> | 2019-11-19 15:36:14 +0200 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2020-03-17 15:04:21 +0100 |
| commit | 300b124fcf6ad2cd99a7b721e0f096785e0a3134 (patch) | |
| tree | b2658cd7613e966f94749fb843b5216d80c05423 /fs/overlayfs | |
| parent | fb33c6510d5595144d585aa194d377cf74d31911 (diff) | |
| download | lwn-300b124fcf6ad2cd99a7b721e0f096785e0a3134.tar.gz lwn-300b124fcf6ad2cd99a7b721e0f096785e0a3134.zip | |
ovl: fix value of i_ino for lower hardlink corner case
Commit 6dde1e42f497 ("ovl: make i_ino consistent with st_ino in more
cases"), relaxed the condition nfs_export=on in order to set the value of
i_ino to xino map of real ino.
Specifically, it also relaxed the pre-condition that index=on for
consistent i_ino. This opened the corner case of lower hardlink in
ovl_get_inode(), which calls ovl_fill_inode() with ino=0 and then
ovl_init_inode() is called to set i_ino to lower real ino without the xino
mapping.
Pass the correct values of ino;fsid in this case to ovl_fill_inode(), so it
can initialize i_ino correctly.
Fixes: 6dde1e42f497 ("ovl: make i_ino consistent with st_ino in more ...")
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/inode.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 79e8994e3bc1..3f993c114829 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -891,7 +891,7 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL; bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry, oip->index); - int fsid = bylower ? oip->lowerpath->layer->fsid : 0; + int fsid = bylower ? lowerpath->layer->fsid : 0; bool is_dir, metacopy = false; unsigned long ino = 0; int err = oip->newinode ? -EEXIST : -ENOMEM; @@ -941,6 +941,8 @@ struct inode *ovl_get_inode(struct super_block *sb, err = -ENOMEM; goto out_err; } + ino = realinode->i_ino; + fsid = lowerpath->layer->fsid; } ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino, fsid); ovl_inode_init(inode, upperdentry, lowerdentry, oip->lowerdata); |