Move i_ino initialization to ovl_inode_init() to avoid the dance
of setting i_ino in ovl_fill_inode() sometimes on the first call
and sometimes on the seconds call.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/overlayfs/inode.c | 35 ++++++++++++++++++++++++++---------
fs/overlayfs/overlayfs.h | 4 ++--
fs/overlayfs/super.c | 13 +++++++++++--
fs/overlayfs/util.c | 18 ------------------
4 files changed, 39 insertions(+), 31 deletions(-)
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 9ed94c70e3cb..04e8e8de2012 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -561,8 +561,7 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
#endif
}
-static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
- unsigned long ino, int fsid)
+static void ovl_map_ino(struct inode *inode, unsigned long ino, int fsid)
{
int xinobits = ovl_xino_bits(inode->i_sb);
@@ -572,10 +571,6 @@ static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
* so inode number exposed via /proc/locks and a like will be
* consistent with d_ino and st_ino values. An i_ino value inconsistent
* with d_ino also causes nfsd readdirplus to fail.
- *
- * When called from ovl_create_object() => ovl_new_inode(), with
- * ino = 0, i_ino will be updated to consistent value later on in
- * ovl_get_inode() => ovl_fill_inode().
*/
if (ovl_same_dev(inode->i_sb)) {
inode->i_ino = ino;
@@ -584,6 +579,28 @@ static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
} else {
inode->i_ino = get_next_ino();
}
+}
+
+void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
+ unsigned long ino, int fsid)
+{
+ struct inode *realinode;
+
+ if (oip->upperdentry)
+ OVL_I(inode)->__upperdentry = oip->upperdentry;
+ if (oip->lowerpath && oip->lowerpath->dentry)
+ OVL_I(inode)->lower = igrab(d_inode(oip->lowerpath->dentry));
+ if (oip->lowerdata)
+ OVL_I(inode)->lowerdata = igrab(d_inode(oip->lowerdata));
+
+ realinode = ovl_inode_real(inode);
+ ovl_copyattr(realinode, inode);
+ ovl_copyflags(realinode, inode);
+ ovl_map_ino(inode, ino, fsid);
+}
+
+static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev)
+{
inode->i_mode = mode;
inode->i_flags |= S_NOCMTIME;
#ifdef CONFIG_FS_POSIX_ACL
@@ -721,7 +738,7 @@ struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev)
inode = new_inode(sb);
if (inode)
- ovl_fill_inode(inode, mode, rdev, 0, 0);
+ ovl_fill_inode(inode, mode, rdev);
return inode;
}
@@ -946,8 +963,8 @@ struct inode *ovl_get_inode(struct super_block *sb,
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);
+ ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev);
+ ovl_inode_init(inode, oip, ino, fsid);
if (upperdentry && ovl_is_impuredir(upperdentry))
ovl_set_flag(OVL_IMPURE, inode);
diff --git a/fs/overlayfs/overlayfs.h b/fs/overlayfs/overlayfs.h
index f7d01c06cdaf..140510d24d9f 100644
--- a/fs/overlayfs/overlayfs.h
+++ b/fs/overlayfs/overlayfs.h
@@ -269,8 +269,6 @@ void ovl_set_upperdata(struct inode *inode);
bool ovl_redirect_dir(struct super_block *sb);
const char *ovl_dentry_get_redirect(struct dentry *dentry);
void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect);
-void ovl_inode_init(struct inode *inode, struct dentry *upperdentry,
- struct dentry *lowerdentry, struct dentry *lowerdata);
void ovl_inode_update(struct inode *inode, struct dentry *upperdentry);
void ovl_dir_modified(struct dentry *dentry, bool impurity);
u64 ovl_dentry_version_get(struct dentry *dentry);
@@ -412,6 +410,8 @@ struct ovl_inode_params {
char *redirect;
struct dentry *lowerdata;
};
+void ovl_inode_init(struct inode *inode, struct ovl_inode_params *oip,
+ unsigned long ino, int fsid);
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,
bool is_upper);
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index 18db065d73b3..d072f982d3de 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -1586,6 +1586,13 @@ static struct dentry *ovl_get_root(struct super_block *sb,
struct ovl_entry *oe)
{
struct dentry *root;
+ struct ovl_path *lowerpath = &oe->lowerstack[0];
+ unsigned long ino = d_inode(lowerpath->dentry)->i_ino;
+ int fsid = lowerpath->layer->fsid;
+ struct ovl_inode_params oip = {
+ .upperdentry = upperdentry,
+ .lowerpath = lowerpath,
+ };
root = d_make_root(ovl_new_inode(sb, S_IFDIR, 0));
if (!root)
@@ -1594,6 +1601,9 @@ static struct dentry *ovl_get_root(struct super_block *sb,
root->d_fsdata = oe;
if (upperdentry) {
+ /* Root inode uses upper st_ino/i_ino */
+ ino = d_inode(upperdentry)->i_ino;
+ fsid = 0;
ovl_dentry_set_upper_alias(root);
if (ovl_is_impuredir(upperdentry))
ovl_set_flag(OVL_IMPURE, d_inode(root));
@@ -1603,8 +1613,7 @@ static struct dentry *ovl_get_root(struct super_block *sb,
ovl_set_flag(OVL_WHITEOUTS, d_inode(root));
ovl_dentry_set_flag(OVL_E_CONNECTED, root);
ovl_set_upperdata(d_inode(root));
- ovl_inode_init(d_inode(root), upperdentry, ovl_dentry_lower(root),
- NULL);
+ ovl_inode_init(d_inode(root), &oip, ino, fsid);
return root;
}
diff --git a/fs/overlayfs/util.c b/fs/overlayfs/util.c
index b28ccede1da9..d6e3f8f42647 100644
--- a/fs/overlayfs/util.c
+++ b/fs/overlayfs/util.c
@@ -388,24 +388,6 @@ void ovl_dentry_set_redirect(struct dentry *dentry, const char *redirect)
oi->redirect = redirect;
}
-void ovl_inode_init(struct inode *inode, struct dentry *upperdentry,
- struct dentry *lowerdentry, struct dentry *lowerdata)
-{
- struct inode *realinode = d_inode(upperdentry ?: lowerdentry);
-
- if (upperdentry)
- OVL_I(inode)->__upperdentry = upperdentry;
- if (lowerdentry)
- OVL_I(inode)->lower = igrab(d_inode(lowerdentry));
- if (lowerdata)
- OVL_I(inode)->lowerdata = igrab(d_inode(lowerdata));
-
- ovl_copyattr(realinode, inode);
- ovl_copyflags(realinode, inode);
- if (!inode->i_ino)
- inode->i_ino = realinode->i_ino;
-}
-
void ovl_inode_update(struct inode *inode, struct dentry *upperdentry)
{
struct inode *upperinode = d_inode(upperdentry);
--
2.17.1
