1 // SPDX-License-Identifier: GPL-2.0+
31 /* Look for an entry in a parent pointing to this inode. */
41 /* Look for a single entry in a directory pointing to an inode. */
55 	if (spc->ino == ino)  in xchk_parent_actor()
56 		spc->nlink++;  in xchk_parent_actor()
59 	 * If we're facing a fatal signal, bail out.  Store the cancellation  in xchk_parent_actor()
63 	if (xchk_should_terminate(spc->sc, &error))  in xchk_parent_actor()
64 		spc->cancelled = true;  in xchk_parent_actor()
78 		.ino		= sc->ip->i_ino,  in xchk_parent_count_parent_dentries()
87 	 * If there are any blocks, read-ahead block 0 as we're almost  in xchk_parent_count_parent_dentries()
88 	 * certain to have the next operation be a read there.  This is  in xchk_parent_count_parent_dentries()
93 	if (parent->i_df.if_nextents > 0)  in xchk_parent_count_parent_dentries()
105 			parent->i_d.di_size);  in xchk_parent_count_parent_dentries()
108 		error = xfs_readdir(sc->tp, parent, &spc.dc, bufsize);  in xchk_parent_count_parent_dentries()
112 			error = -EAGAIN;  in xchk_parent_count_parent_dentries()
135 	struct xfs_mount	*mp = sc->mp;  in xchk_parent_validate()
143 	if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)  in xchk_parent_validate()
147 	if (sc->ip->i_ino == dnum) {  in xchk_parent_validate()
153 	 * If we're an unlinked directory, the parent /won't/ have a link  in xchk_parent_validate()
156 	expected_nlink = VFS_I(sc->ip)->i_nlink == 0 ? 0 : 1;  in xchk_parent_validate()
160 	 * cancel the scrub transaction.  Since we're don't know a  in xchk_parent_validate()
162 	 * cleanup (which allocates what would be a nested transaction)  in xchk_parent_validate()
163 	 * if the parent pointer erroneously points to a file, we  in xchk_parent_validate()
167 	 * If _iget returns -EINVAL then the parent inode number is garbage  in xchk_parent_validate()
168 	 * and the directory is corrupt.  If the _iget returns -EFSCORRUPTED  in xchk_parent_validate()
169 	 * or -EFSBADCRC then the parent is corrupt which is a cross  in xchk_parent_validate()
172 	error = xfs_iget(mp, sc->tp, dnum, XFS_IGET_UNTRUSTED, 0, &dp);  in xchk_parent_validate()
173 	if (error == -EINVAL) {  in xchk_parent_validate()
174 		error = -EFSCORRUPTED;  in xchk_parent_validate()
180 	if (dp == sc->ip || !S_ISDIR(VFS_I(dp)->i_mode)) {  in xchk_parent_validate()
187 	 * its alleged parent for a forward reference.  If we can grab  in xchk_parent_validate()
208 	xfs_iunlock(sc->ip, sc->ilock_flags);  in xchk_parent_validate()
209 	sc->ilock_flags = 0;  in xchk_parent_validate()
221 	error = xchk_ilock_inverted(sc->ip, XFS_IOLOCK_EXCL);  in xchk_parent_validate()
224 	sc->ilock_flags = XFS_IOLOCK_EXCL;  in xchk_parent_validate()
227 	 * If we're an unlinked directory, the parent /won't/ have a link  in xchk_parent_validate()
228 	 * to us.  Otherwise, it should have one link.  We have to re-set  in xchk_parent_validate()
229 	 * it here because we dropped the lock on sc->ip.  in xchk_parent_validate()
231 	expected_nlink = VFS_I(sc->ip)->i_nlink == 0 ? 0 : 1;  in xchk_parent_validate()
234 	error = xfs_dir_lookup(sc->tp, sc->ip, &xfs_name_dotdot, &dnum, NULL);  in xchk_parent_validate()
239 	if (dnum != dp->i_ino) {  in xchk_parent_validate()
262 /* Scrub a parent pointer. */
267 	struct xfs_mount	*mp = sc->mp;  in xchk_parent()
274 	 * If we're a directory, check that the '..' link points up to  in xchk_parent()
275 	 * a directory that has one entry pointing to us.  in xchk_parent()
277 	if (!S_ISDIR(VFS_I(sc->ip)->i_mode))  in xchk_parent()
278 		return -ENOENT;  in xchk_parent()
280 	/* We're not a special inode, are we? */  in xchk_parent()
281 	if (!xfs_verify_dir_ino(mp, sc->ip->i_ino)) {  in xchk_parent()
287 	 * The VFS grabs a read or write lock via i_rwsem before it reads  in xchk_parent()
288 	 * or writes to a directory.  If we've gotten this far we've  in xchk_parent()
290 	 * getting a write lock on i_rwsem.  Therefore, it is safe for us  in xchk_parent()
293 	sc->ilock_flags &= ~(XFS_ILOCK_EXCL | XFS_MMAPLOCK_EXCL);  in xchk_parent()
294 	xfs_iunlock(sc->ip, XFS_ILOCK_EXCL | XFS_MMAPLOCK_EXCL);  in xchk_parent()
297 	error = xfs_dir_lookup(sc->tp, sc->ip, &xfs_name_dotdot, &dnum, NULL);  in xchk_parent()
306 	if (sc->ip == mp->m_rootip) {  in xchk_parent()
307 		if (sc->ip->i_ino != mp->m_sb.sb_rootino ||  in xchk_parent()
308 		    sc->ip->i_ino != dnum)  in xchk_parent()
327 	 * If we failed to lock the parent inode even after a retry, just mark  in xchk_parent()
330 	if ((sc->flags & XCHK_TRY_HARDER) && error == -EDEADLOCK) {  in xchk_parent()