diff options
Diffstat (limited to 'fs/overlayfs')
| -rw-r--r-- | fs/overlayfs/export.c | 3 | ||||
| -rw-r--r-- | fs/overlayfs/inode.c | 18 |
2 files changed, 21 insertions, 0 deletions
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c index 475c61f53f0f..ed5c1078919c 100644 --- a/fs/overlayfs/export.c +++ b/fs/overlayfs/export.c @@ -783,6 +783,9 @@ static struct ovl_fh *ovl_fid_to_fh(struct fid *fid, int buflen, int fh_type) if (fh_type != OVL_FILEID_V0) return ERR_PTR(-EINVAL); + if (buflen <= OVL_FH_WIRE_OFFSET) + return ERR_PTR(-EINVAL); + fh = kzalloc(buflen, GFP_KERNEL); if (!fh) return ERR_PTR(-ENOMEM); diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index b0d42ece4d7c..981f11ec51bc 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -58,6 +58,24 @@ int ovl_setattr(struct dentry *dentry, struct iattr *attr) if (attr->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID)) attr->ia_valid &= ~ATTR_MODE; + /* + * We might have to translate ovl file into real file object + * once use cases emerge. For now, simply don't let underlying + * filesystem rely on attr->ia_file + */ + attr->ia_valid &= ~ATTR_FILE; + + /* + * If open(O_TRUNC) is done, VFS calls ->setattr with ATTR_OPEN + * set. Overlayfs does not pass O_TRUNC flag to underlying + * filesystem during open -> do not pass ATTR_OPEN. This + * disables optimization in fuse which assumes open(O_TRUNC) + * already set file size to 0. But we never passed O_TRUNC to + * fuse. So by clearing ATTR_OPEN, fuse will be forced to send + * setattr request to server. + */ + attr->ia_valid &= ~ATTR_OPEN; + inode_lock(upperdentry->d_inode); old_cred = ovl_override_creds(dentry->d_sb); err = notify_change(upperdentry, attr, NULL); |