diff options
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/fs/namei.c b/fs/namei.c index 12a4159de72a..b87465d67c60 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -4682,10 +4682,19 @@ int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen) { struct inode *inode = d_inode(dentry); - if (!inode->i_op->readlink) - return -EINVAL; + if (unlikely(!(inode->i_opflags & IOP_DEFAULT_READLINK))) { + if (unlikely(inode->i_op->readlink)) + return inode->i_op->readlink(dentry, buffer, buflen); + + if (!d_is_symlink(dentry)) + return -EINVAL; + + spin_lock(&inode->i_lock); + inode->i_opflags |= IOP_DEFAULT_READLINK; + spin_unlock(&inode->i_lock); + } - return inode->i_op->readlink(dentry, buffer, buflen); + return generic_readlink(dentry, buffer, buflen); } EXPORT_SYMBOL(vfs_readlink); |