diff options
Diffstat (limited to 'fs/btrfs/super.c')
| -rw-r--r-- | fs/btrfs/super.c | 242 |
1 files changed, 116 insertions, 126 deletions
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 0a93fbd29494..3a33dd9847d9 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -2694,7 +2694,7 @@ static __cold void btrfs_interface_exit(void) misc_deregister(&btrfs_misc); } -static void __init btrfs_print_mod_info(void) +static int __init btrfs_print_mod_info(void) { static const char options[] = "" #ifdef CONFIG_BTRFS_DEBUG @@ -2721,143 +2721,133 @@ static void __init btrfs_print_mod_info(void) #endif ; pr_info("Btrfs loaded, crc32c=%s%s\n", crc32c_impl(), options); + return 0; } -static int __init init_btrfs_fs(void) +static int register_btrfs(void) { - int err; - - btrfs_props_init(); - - err = btrfs_init_sysfs(); - if (err) - return err; - - btrfs_init_compress(); - - err = btrfs_init_cachep(); - if (err) - goto free_compress; - - err = btrfs_transaction_init(); - if (err) - goto free_cachep; - - err = btrfs_ctree_init(); - if (err) - goto free_transaction; - - err = btrfs_free_space_init(); - if (err) - goto free_ctree; - - err = extent_state_init_cachep(); - if (err) - goto free_free_space; - - err = extent_buffer_init_cachep(); - if (err) - goto free_extent_cachep; - - err = btrfs_bioset_init(); - if (err) - goto free_eb_cachep; - - err = extent_map_init(); - if (err) - goto free_bioset; - - err = ordered_data_init(); - if (err) - goto free_extent_map; - - err = btrfs_delayed_inode_init(); - if (err) - goto free_ordered_data; - - err = btrfs_auto_defrag_init(); - if (err) - goto free_delayed_inode; - - err = btrfs_delayed_ref_init(); - if (err) - goto free_auto_defrag; - - err = btrfs_prelim_ref_init(); - if (err) - goto free_delayed_ref; - - err = btrfs_interface_init(); - if (err) - goto free_prelim_ref; + return register_filesystem(&btrfs_fs_type); +} - btrfs_print_mod_info(); +static void unregister_btrfs(void) +{ + unregister_filesystem(&btrfs_fs_type); +} - err = btrfs_run_sanity_tests(); - if (err) - goto unregister_ioctl; +/* Helper structure for long init/exit functions. */ +struct init_sequence { + int (*init_func)(void); + /* Can be NULL if the init_func doesn't need cleanup. */ + void (*exit_func)(void); +}; - err = register_filesystem(&btrfs_fs_type); - if (err) - goto unregister_ioctl; +static const struct init_sequence mod_init_seq[] = { + { + .init_func = btrfs_props_init, + .exit_func = NULL, + }, { + .init_func = btrfs_init_sysfs, + .exit_func = btrfs_exit_sysfs, + }, { + .init_func = btrfs_init_compress, + .exit_func = btrfs_exit_compress, + }, { + .init_func = btrfs_init_cachep, + .exit_func = btrfs_destroy_cachep, + }, { + .init_func = btrfs_transaction_init, + .exit_func = btrfs_transaction_exit, + }, { + .init_func = btrfs_ctree_init, + .exit_func = btrfs_ctree_exit, + }, { + .init_func = btrfs_free_space_init, + .exit_func = btrfs_free_space_exit, + }, { + .init_func = extent_state_init_cachep, + .exit_func = extent_state_free_cachep, + }, { + .init_func = extent_buffer_init_cachep, + .exit_func = extent_buffer_free_cachep, + }, { + .init_func = btrfs_bioset_init, + .exit_func = btrfs_bioset_exit, + }, { + .init_func = extent_map_init, + .exit_func = extent_map_exit, + }, { + .init_func = ordered_data_init, + .exit_func = ordered_data_exit, + }, { + .init_func = btrfs_delayed_inode_init, + .exit_func = btrfs_delayed_inode_exit, + }, { + .init_func = btrfs_auto_defrag_init, + .exit_func = btrfs_auto_defrag_exit, + }, { + .init_func = btrfs_delayed_ref_init, + .exit_func = btrfs_delayed_ref_exit, + }, { + .init_func = btrfs_prelim_ref_init, + .exit_func = btrfs_prelim_ref_exit, + }, { + .init_func = btrfs_interface_init, + .exit_func = btrfs_interface_exit, + }, { + .init_func = btrfs_print_mod_info, + .exit_func = NULL, + }, { + .init_func = btrfs_run_sanity_tests, + .exit_func = NULL, + }, { + .init_func = register_btrfs, + .exit_func = unregister_btrfs, + } +}; - return 0; +static bool mod_init_result[ARRAY_SIZE(mod_init_seq)]; -unregister_ioctl: - btrfs_interface_exit(); -free_prelim_ref: - btrfs_prelim_ref_exit(); -free_delayed_ref: - btrfs_delayed_ref_exit(); -free_auto_defrag: - btrfs_auto_defrag_exit(); -free_delayed_inode: - btrfs_delayed_inode_exit(); -free_ordered_data: - ordered_data_exit(); -free_extent_map: - extent_map_exit(); -free_bioset: - btrfs_bioset_exit(); -free_eb_cachep: - extent_buffer_free_cachep(); -free_extent_cachep: - extent_state_free_cachep(); -free_free_space: - btrfs_free_space_exit(); -free_ctree: - btrfs_ctree_exit(); -free_transaction: - btrfs_transaction_exit(); -free_cachep: - btrfs_destroy_cachep(); -free_compress: - btrfs_exit_compress(); - btrfs_exit_sysfs(); +static void __exit exit_btrfs_fs(void) +{ + int i; - return err; + for (i = ARRAY_SIZE(mod_init_seq) - 1; i >= 0; i--) { + if (!mod_init_result[i]) + continue; + if (mod_init_seq[i].exit_func) + mod_init_seq[i].exit_func(); + mod_init_result[i] = false; + } } -static void __exit exit_btrfs_fs(void) +static int __init init_btrfs_fs(void) { - btrfs_free_space_exit(); - btrfs_ctree_exit(); - btrfs_transaction_exit(); - btrfs_destroy_cachep(); - btrfs_delayed_ref_exit(); - btrfs_auto_defrag_exit(); - btrfs_delayed_inode_exit(); - btrfs_prelim_ref_exit(); - ordered_data_exit(); - extent_map_exit(); - btrfs_bioset_exit(); - extent_state_free_cachep(); - extent_buffer_free_cachep(); - btrfs_interface_exit(); - unregister_filesystem(&btrfs_fs_type); - btrfs_exit_sysfs(); - btrfs_cleanup_fs_uuids(); - btrfs_exit_compress(); + int ret; + int i; + + for (i = 0; i < ARRAY_SIZE(mod_init_seq); i++) { + ASSERT(!mod_init_result[i]); + ret = mod_init_seq[i].init_func(); + if (ret < 0) + goto error; + mod_init_result[i] = true; + } + return 0; + +error: + /* + * If we call exit_btrfs_fs() it would cause section mismatch. + * As init_btrfs_fs() belongs to .init.text, while exit_btrfs_fs() + * belongs to .exit.text. + */ + for (i = ARRAY_SIZE(mod_init_seq) - 1; i >= 0; i--) { + if (!mod_init_result[i]) + continue; + if (mod_init_seq[i].exit_func) + mod_init_seq[i].exit_func(); + mod_init_result[i] = false; + } + return ret; } late_initcall(init_btrfs_fs); |