fs: Don't allow to create hardlink for deleted file
Add inode->i_nlink == 0 check in VFS. Some of the file systems do this internally. A followup patch will remove those instance. This is needed to ensure that with link by handle we don't allow to create hardlink of an unlinked file. The check also prevent a race between unlink and link Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
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@ -2906,7 +2906,11 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
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return error;
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mutex_lock(&inode->i_mutex);
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error = dir->i_op->link(old_dentry, dir, new_dentry);
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/* Make sure we don't allow creating hardlink to an unlinked file */
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if (inode->i_nlink == 0)
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error = -ENOENT;
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else
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error = dir->i_op->link(old_dentry, dir, new_dentry);
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mutex_unlock(&inode->i_mutex);
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if (!error)
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fsnotify_link(dir, inode, new_dentry);
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