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Diffstat (limited to 'fs')
-rw-r--r--fs/overlayfs/inode.c20
-rw-r--r--fs/overlayfs/namei.c20
-rw-r--r--fs/overlayfs/overlayfs.h3
3 files changed, 26 insertions, 17 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index a619addecafc..321511ed8c42 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -598,18 +598,30 @@ static bool ovl_verify_inode(struct inode *inode, struct dentry *lowerdentry,
return true;
}
-struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry)
+struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
+ struct dentry *index)
{
struct dentry *lowerdentry = ovl_dentry_lower(dentry);
struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
struct inode *inode;
+ /* Already indexed or could be indexed on copy up? */
+ bool indexed = (index || (ovl_indexdir(dentry->d_sb) && !upperdentry));
+
+ if (WARN_ON(upperdentry && indexed && !lowerdentry))
+ return ERR_PTR(-EIO);
if (!realinode)
realinode = d_inode(lowerdentry);
- if (!S_ISDIR(realinode->i_mode) &&
- (upperdentry || (lowerdentry && ovl_indexdir(dentry->d_sb)))) {
- struct inode *key = d_inode(lowerdentry ?: upperdentry);
+ /*
+ * Copy up origin (lower) may exist for non-indexed upper, but we must
+ * not use lower as hash key in that case.
+ * Hash inodes that are or could be indexed by origin inode and
+ * non-indexed upper inodes that could be hard linked by upper inode.
+ */
+ if (!S_ISDIR(realinode->i_mode) && (upperdentry || indexed)) {
+ struct inode *key = d_inode(indexed ? lowerdentry :
+ upperdentry);
unsigned int nlink;
inode = iget5_locked(dentry->d_sb, (unsigned long) key,
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index e08164156cfe..05e9a0ad5c08 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -516,18 +516,9 @@ static struct dentry *ovl_lookup_index(struct dentry *dentry,
inode = d_inode(index);
if (d_is_negative(index)) {
- if (upper && d_inode(origin)->i_nlink > 1) {
- pr_warn_ratelimited("overlayfs: hard link with origin but no index (ino=%lu).\n",
- d_inode(origin)->i_ino);
- goto fail;
- }
-
- dput(index);
- index = NULL;
+ goto out_dput;
} else if (upper && d_inode(upper) != inode) {
- pr_warn_ratelimited("overlayfs: wrong index found (index=%pd2, ino=%lu, upper ino=%lu).\n",
- index, inode->i_ino, d_inode(upper)->i_ino);
- goto fail;
+ goto out_dput;
} else if (ovl_dentry_weird(index) || ovl_is_whiteout(index) ||
((inode->i_mode ^ d_inode(origin)->i_mode) & S_IFMT)) {
/*
@@ -547,6 +538,11 @@ out:
kfree(name.name);
return index;
+out_dput:
+ dput(index);
+ index = NULL;
+ goto out;
+
fail:
dput(index);
index = ERR_PTR(-EIO);
@@ -710,7 +706,7 @@ struct dentry *ovl_lookup(struct inode *dir, struct dentry *dentry,
upperdentry = dget(index);
if (upperdentry || ctr) {
- inode = ovl_get_inode(dentry, upperdentry);
+ inode = ovl_get_inode(dentry, upperdentry, index);
err = PTR_ERR(inode);
if (IS_ERR(inode))
goto out_free_oe;
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index c706a6f99928..d9a0edd4e57e 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -286,7 +286,8 @@ int ovl_update_time(struct inode *inode, struct timespec *ts, int flags);
bool ovl_is_private_xattr(const char *name);
struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev);
-struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry);
+struct inode *ovl_get_inode(struct dentry *dentry, struct dentry *upperdentry,
+ struct dentry *index);
static inline void ovl_copyattr(struct inode *from, struct inode *to)
{
to->i_uid = from->i_uid;