args.fsbno = XFS_AGB_TO_FSB(mp, agno, aglen - delta);
+ /*
+ * Make sure that the last inode cluster cannot overlap with the new
+ * end of the AG, even if it's sparse.
+ */
+ error = xfs_ialloc_check_shrink(*tpp, agno, agibp, aglen - delta);
+ if (error)
+ return error;
+
/*
* Disable perag reservations so it doesn't cause the allocation request
* to fail. We'll reestablish reservation before we return.
return XFS_AGINO_TO_INO(mp, 0, XFS_AGB_TO_AGINO(mp, first_bno));
}
+
+/*
+ * Ensure there are not sparse inode clusters that cross the new EOAG.
+ *
+ * This is a no-op for non-spinode filesystems since clusters are always fully
+ * allocated and checking the bnobt suffices. However, a spinode filesystem
+ * could have a record where the upper inodes are free blocks. If those blocks
+ * were removed from the filesystem, the inode record would extend beyond EOAG,
+ * which will be flagged as corruption.
+ */
+int
+xfs_ialloc_check_shrink(
+ struct xfs_trans *tp,
+ xfs_agnumber_t agno,
+ struct xfs_buf *agibp,
+ xfs_agblock_t new_length)
+{
+ struct xfs_inobt_rec_incore rec;
+ struct xfs_btree_cur *cur;
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_perag *pag;
+ xfs_agino_t agino = XFS_AGB_TO_AGINO(mp, new_length);
+ int has;
+ int error;
+
+ if (!xfs_sb_version_hassparseinodes(&mp->m_sb))
+ return 0;
+
+ pag = xfs_perag_get(mp, agno);
+ cur = xfs_inobt_init_cursor(mp, tp, agibp, pag, XFS_BTNUM_INO);
+
+ /* Look up the inobt record that would correspond to the new EOFS. */
+ error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &has);
+ if (error || !has)
+ goto out;
+
+ error = xfs_inobt_get_rec(cur, &rec, &has);
+ if (error)
+ goto out;
+
+ if (!has) {
+ error = -EFSCORRUPTED;
+ goto out;
+ }
+
+ /* If the record covers inodes that would be beyond EOFS, bail out. */
+ if (rec.ir_startino + XFS_INODES_PER_CHUNK > agino) {
+ error = -ENOSPC;
+ goto out;
+ }
+out:
+ xfs_btree_del_cursor(cur, error);
+ xfs_perag_put(pag);
+ return error;
+}
void xfs_ialloc_setup_geometry(struct xfs_mount *mp);
xfs_ino_t xfs_ialloc_calc_rootino(struct xfs_mount *mp, int sunit);
+int xfs_ialloc_check_shrink(struct xfs_trans *tp, xfs_agnumber_t agno,
+ struct xfs_buf *agibp, xfs_agblock_t new_length);
+
#endif /* __XFS_IALLOC_H__ */