summaryrefslogtreecommitdiff
path: root/fs/overlayfs/inode.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/overlayfs/inode.c')
-rw-r--r--fs/overlayfs/inode.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c
index 51d780898d89..6e3815fb006b 100644
--- a/fs/overlayfs/inode.c
+++ b/fs/overlayfs/inode.c
@@ -489,19 +489,26 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
}
static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
- unsigned long ino)
+ unsigned long ino, int fsid)
{
+ int xinobits = ovl_xino_bits(inode->i_sb);
+
/*
* When NFS export is enabled and d_ino is consistent with st_ino
- * (samefs), set the same value to i_ino, because nfsd readdirplus
- * compares d_ino values to i_ino values of child entries. When called
- * from ovl_new_inode(), ino arg is 0, so i_ino will be updated to real
+ * (samefs or i_ino has enough bits to encode layer), set the same
+ * value used for d_ino to i_ino, because nfsd readdirplus compares
+ * d_ino values to i_ino values of child entries. When called from
+ * ovl_new_inode(), ino arg is 0, so i_ino will be updated to real
* upper inode i_ino on ovl_inode_init() or ovl_inode_update().
*/
- if (inode->i_sb->s_export_op && ovl_same_sb(inode->i_sb))
+ if (inode->i_sb->s_export_op &&
+ (ovl_same_sb(inode->i_sb) || xinobits)) {
inode->i_ino = ino;
- else
+ if (xinobits && fsid && !(ino >> (64 - xinobits)))
+ inode->i_ino |= (unsigned long)fsid << (64 - xinobits);
+ } else {
inode->i_ino = get_next_ino();
+ }
inode->i_mode = mode;
inode->i_flags |= S_NOCMTIME;
#ifdef CONFIG_FS_POSIX_ACL
@@ -637,7 +644,7 @@ 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);
+ ovl_fill_inode(inode, mode, rdev, 0, 0);
return inode;
}
@@ -743,12 +750,14 @@ static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper,
}
struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
- struct dentry *lowerdentry, struct dentry *index,
+ struct ovl_path *lowerpath, struct dentry *index,
unsigned int numlower)
{
struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
struct inode *inode;
+ struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL;
bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry, index);
+ int fsid = bylower ? lowerpath->layer->fsid : 0;
bool is_dir;
unsigned long ino = 0;
@@ -796,7 +805,7 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry,
if (!inode)
goto out_nomem;
}
- ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino);
+ ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino, fsid);
ovl_inode_init(inode, upperdentry, lowerdentry);
if (upperdentry && ovl_is_impuredir(upperdentry))