ext4: avoid BUG_ON when creating xattrs

commit b40ebaf63851b3a401b0dc9263843538f64f5ce6 upstream.

Commit fb0a387dcdcd ("ext4: limit block allocations for indirect-block
files to < 2^32") added code to try to allocate xattr block with 32-bit
block number for indirect block based files on the grounds that these
files cannot use larger block numbers. It also added BUG_ON when
allocated block could not fit into 32 bits. This is however bogus
reasoning because xattr block is stored in inode->i_file_acl and
inode->i_file_acl_hi and as such even indirect block based files can
happily use full 48 bits for xattr block number. The proper handling
seems to be there basically since 64-bit block number support was added.
So remove the bogus limitation and BUG_ON.

Cc: Eric Sandeen <sandeen@redhat.com>
Fixes: fb0a387dcdcd ("ext4: limit block allocations for indirect-block files to < 2^32")
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20221121130929.32031-1-jack@suse.cz
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index 36d6ba7..800ce5c 100644 (file)
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -2070,19 +2070,11 @@ inserted:
 
                        goal = ext4_group_first_block_no(sb,
                                                EXT4_I(inode)->i_block_group);
-
-                       /* non-extent files can't have physical blocks past 2^32 */
-                       if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
-                               goal = goal & EXT4_MAX_BLOCK_FILE_PHYS;
-
                        block = ext4_new_meta_blocks(handle, inode, goal, 0,
                                                     NULL, &error);
                        if (error)
                                goto cleanup;
 
-                       if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
-                               BUG_ON(block > EXT4_MAX_BLOCK_FILE_PHYS);
-
                        ea_idebug(inode, "creating block %llu",
                                  (unsigned long long)block);