diff --git a/Documentation/filesystems/btrfs.txt b/Documentation/filesystems/btrfs.txt index c772b47e7ef0..6593d2e415c5 100644 --- a/Documentation/filesystems/btrfs.txt +++ b/Documentation/filesystems/btrfs.txt @@ -168,10 +168,23 @@ Options with (*) are default options and will not show in the mount options. notreelog Enable/disable the tree logging used for fsync and O_SYNC writes. - recovery - Enable autorecovery attempts if a bad tree root is found at mount time. - Currently this scans a list of several previous tree roots and tries to + nologreplay + Disable the log tree replay at mount time to prevent filesystem + from getting modified. + Must be used with 'ro' mount option. + A filesystem mounted with this option cannot transition to a + read-write mount via remount,rw - the filesystem must be unmounted + and mounted back again if read-write access is desired. + + usebackuproot + Enable attempts to use backup tree roots if a bad tree root is found at + mount time. + Currently this scans a list of 4 previous tree roots and tries to use the first readable. + And since the mount option doesn't affect any behavior after mount, + it won't be shown in mount info. + Prior to 4.6, this was done by 'recovery' option that has been + deprecated, but will work. rescan_uuid_tree Force check and rebuild procedure of the UUID tree. This should not diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index 3fb3b787aa5e..6af1211d4ee9 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -2274,7 +2274,7 @@ struct btrfs_ioctl_defrag_range_args { #define BTRFS_MOUNT_ENOSPC_DEBUG (1 << 15) #define BTRFS_MOUNT_AUTO_DEFRAG (1 << 16) #define BTRFS_MOUNT_INODE_MAP_CACHE (1 << 17) -#define BTRFS_MOUNT_RECOVERY (1 << 18) +#define BTRFS_MOUNT_USEBACKUPROOT (1 << 18) #define BTRFS_MOUNT_SKIP_BALANCE (1 << 19) #define BTRFS_MOUNT_CHECK_INTEGRITY (1 << 20) #define BTRFS_MOUNT_CHECK_INTEGRITY_INCLUDING_EXTENT_DATA (1 << 21) @@ -2283,6 +2283,7 @@ struct btrfs_ioctl_defrag_range_args { #define BTRFS_MOUNT_FRAGMENT_DATA (1 << 24) #define BTRFS_MOUNT_FRAGMENT_METADATA (1 << 25) #define BTRFS_MOUNT_FREE_SPACE_TREE (1 << 26) +#define BTRFS_MOUNT_NOLOGREPLAY (1 << 27) #define BTRFS_DEFAULT_COMMIT_INTERVAL (30) #define BTRFS_DEFAULT_MAX_INLINE (8192) @@ -4187,7 +4188,8 @@ void btrfs_sysfs_remove_mounted(struct btrfs_fs_info *fs_info); ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size); /* super.c */ -int btrfs_parse_options(struct btrfs_root *root, char *options); +int btrfs_parse_options(struct btrfs_root *root, char *options, + unsigned long new_flags); int btrfs_sync_fs(struct super_block *sb, int wait); #ifdef CONFIG_PRINTK diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 40690e90beee..294c77729df3 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -2751,7 +2751,7 @@ int open_ctree(struct super_block *sb, */ fs_info->compress_type = BTRFS_COMPRESS_ZLIB; - ret = btrfs_parse_options(tree_root, options); + ret = btrfs_parse_options(tree_root, options, sb->s_flags); if (ret) { err = ret; goto fail_alloc; @@ -3030,8 +3030,9 @@ retry_root_backup: if (ret) goto fail_trans_kthread; - /* do not make disk changes in broken FS */ - if (btrfs_super_log_root(disk_super) != 0) { + /* do not make disk changes in broken FS or nologreplay is given */ + if (btrfs_super_log_root(disk_super) != 0 && + !btrfs_test_opt(tree_root, NOLOGREPLAY)) { ret = btrfs_replay_log(fs_info, fs_devices); if (ret) { err = ret; @@ -3147,6 +3148,12 @@ retry_root_backup: fs_info->open = 1; + /* + * backuproot only affect mount behavior, and if open_ctree succeeded, + * no need to keep the flag + */ + btrfs_clear_opt(fs_info->mount_opt, USEBACKUPROOT); + return 0; fail_qgroup: @@ -3201,7 +3208,7 @@ fail: return err; recovery_tree_root: - if (!btrfs_test_opt(tree_root, RECOVERY)) + if (!btrfs_test_opt(tree_root, USEBACKUPROOT)) goto fail_tree_roots; free_root_pointers(fs_info, 0); diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index d41e09fe8e38..bf75200c6f86 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -303,7 +303,8 @@ enum { Opt_check_integrity_print_mask, Opt_fatal_errors, Opt_rescan_uuid_tree, Opt_commit_interval, Opt_barrier, Opt_nodefrag, Opt_nodiscard, Opt_noenospc_debug, Opt_noflushoncommit, Opt_acl, Opt_datacow, - Opt_datasum, Opt_treelog, Opt_noinode_cache, + Opt_datasum, Opt_treelog, Opt_noinode_cache, Opt_usebackuproot, + Opt_nologreplay, Opt_norecovery, #ifdef CONFIG_BTRFS_DEBUG Opt_fragment_data, Opt_fragment_metadata, Opt_fragment_all, #endif @@ -335,6 +336,8 @@ static const match_table_t tokens = { {Opt_noacl, "noacl"}, {Opt_notreelog, "notreelog"}, {Opt_treelog, "treelog"}, + {Opt_nologreplay, "nologreplay"}, + {Opt_norecovery, "norecovery"}, {Opt_flushoncommit, "flushoncommit"}, {Opt_noflushoncommit, "noflushoncommit"}, {Opt_ratio, "metadata_ratio=%d"}, @@ -352,7 +355,8 @@ static const match_table_t tokens = { {Opt_inode_cache, "inode_cache"}, {Opt_noinode_cache, "noinode_cache"}, {Opt_no_space_cache, "nospace_cache"}, - {Opt_recovery, "recovery"}, + {Opt_recovery, "recovery"}, /* deprecated */ + {Opt_usebackuproot, "usebackuproot"}, {Opt_skip_balance, "skip_balance"}, {Opt_check_integrity, "check_int"}, {Opt_check_integrity_including_extent_data, "check_int_data"}, @@ -373,7 +377,8 @@ static const match_table_t tokens = { * reading in a new superblock is parsed here. * XXX JDM: This needs to be cleaned up for remount. */ -int btrfs_parse_options(struct btrfs_root *root, char *options) +int btrfs_parse_options(struct btrfs_root *root, char *options, + unsigned long new_flags) { struct btrfs_fs_info *info = root->fs_info; substring_t args[MAX_OPT_ARGS]; @@ -393,8 +398,12 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) else if (cache_gen) btrfs_set_opt(info->mount_opt, SPACE_CACHE); + /* + * Even the options are empty, we still need to do extra check + * against new flags + */ if (!options) - goto out; + goto check; /* * strsep changes the string, duplicate it because parse_options @@ -606,6 +615,11 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) btrfs_clear_and_info(root, NOTREELOG, "enabling tree log"); break; + case Opt_norecovery: + case Opt_nologreplay: + btrfs_set_and_info(root, NOLOGREPLAY, + "disabling log replay at mount time"); + break; case Opt_flushoncommit: btrfs_set_and_info(root, FLUSHONCOMMIT, "turning on flush-on-commit"); @@ -696,8 +710,12 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) "disabling auto defrag"); break; case Opt_recovery: - btrfs_info(root->fs_info, "enabling auto recovery"); - btrfs_set_opt(info->mount_opt, RECOVERY); + btrfs_warn(root->fs_info, + "'recovery' is deprecated, use 'usebackuproot' instead"); + case Opt_usebackuproot: + btrfs_info(root->fs_info, + "trying to use backup root at mount time"); + btrfs_set_opt(info->mount_opt, USEBACKUPROOT); break; case Opt_skip_balance: btrfs_set_opt(info->mount_opt, SKIP_BALANCE); @@ -792,6 +810,15 @@ int btrfs_parse_options(struct btrfs_root *root, char *options) break; } } +check: + /* + * Extra check for current option against current flag + */ + if (btrfs_test_opt(root, NOLOGREPLAY) && !(new_flags & MS_RDONLY)) { + btrfs_err(root->fs_info, + "nologreplay must be used with ro mount option"); + ret = -EINVAL; + } out: if (btrfs_fs_compat_ro(root->fs_info, FREE_SPACE_TREE) && !btrfs_test_opt(root, FREE_SPACE_TREE) && @@ -1202,6 +1229,8 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) seq_puts(seq, ",ssd"); if (btrfs_test_opt(root, NOTREELOG)) seq_puts(seq, ",notreelog"); + if (btrfs_test_opt(root, NOLOGREPLAY)) + seq_puts(seq, ",nologreplay"); if (btrfs_test_opt(root, FLUSHONCOMMIT)) seq_puts(seq, ",flushoncommit"); if (btrfs_test_opt(root, DISCARD)) @@ -1228,8 +1257,6 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry) seq_puts(seq, ",inode_cache"); if (btrfs_test_opt(root, SKIP_BALANCE)) seq_puts(seq, ",skip_balance"); - if (btrfs_test_opt(root, RECOVERY)) - seq_puts(seq, ",recovery"); #ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY if (btrfs_test_opt(root, CHECK_INTEGRITY_INCLUDING_EXTENT_DATA)) seq_puts(seq, ",check_int_data"); @@ -1685,7 +1712,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data) } } - ret = btrfs_parse_options(root, data); + ret = btrfs_parse_options(root, data, *flags); if (ret) { ret = -EINVAL; goto restore;