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In HFS+ filesystems, during b-tree open (hfs_btree_open()), the code verifies that the allocation map bit for the tree header (node 0) is set. If not, it indicates a corrupted map record/bitmap and mounts the volume as read-only (SB_RDONLY) to prevent further damage. HFS filesystems share the same b-tree structure but currently lack this corruption detection check. Port this check to HFS, aligning its implementation with HFS+ to maintain consistent b-tree logic across both filesystems: 1. Define struct hfs_bmap_ctx, and define HFS_TREE_HEAD and the relevant map record indices in include/linux/hfs_common.h. 2. Port the necessary offset and length validation helpers to fs/hfs/btree.h as static inline functions with robust null pointer checks. 3. Implement static hfs_bmap_get_map_page() in fs/hfs/btree.c. 4. Implement static hfs_bmap_test_bit() in fs/hfs/btree.c to inspect the B-tree bitmap using the get_map_page helper. 5. Implement static hfs_bmap_clear_bit() in fs/hfs/btree.c. 6. Rewrite hfs_bmap_alloc() in fs/hfs/btree.c to use the unified hfs_bmap_get_map_page() helper, eliminating redundant page and offset calculation code. 7. Refactor hfs_bmap_free() in fs/hfs/btree.c to use the new hfs_bmap_clear_bit() helper. 8. In hfs_btree_open(), retrieve the header node via hfs_bnode_find(), test its allocation bit with hfs_bmap_test_bit(), and release it using hfs_bnode_put(). Suggested-by: Viacheslav Dubeyko <slava@dubeyko.com> Link: https://lore.kernel.org/all/6a36101b.be22b350.2a3e9.0001.GAE@google.com/T/#r446d0fed2a2900bd805534bbcb799d86619ae2ea Signed-off-by: Aditya Prakash Srivastava <aditya.ansh182@gmail.com> Reviewed-by: Viacheslav Dubeyko <slava@dubeyko.com> Signed-off-by: Viacheslav Dubeyko <slava@dubeyko.com> Link: https://lore.kernel.org/r/20260716074150.1660-1-aditya.ansh182@gmail.com Signed-off-by: Viacheslav Dubeyko <slava@dubeyko.com> |
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