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btrfs: Introduce new mount option usebackuproot to replace recovery

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Current "recovery" mount option will only try to use backup root.
However the word "recovery" is too generic and may be confusing for some
users.

Here introduce a new and more specific mount option, "usebackuproot" to
replace "recovery" mount option.
"Recovery" will be kept for compatibility reason, but will be
deprecated.

Also, since "usebackuproot" will only affect mount behavior and after
open_ctree() it has nothing to do with the filesystem, so clear the flag
after mount succeeded.

This provides the basis for later unified "norecovery" mount option.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
[ dropped usebackuproot from show_mount, added note about 'recovery' to
  docs ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2016-01-19 10:23:02 +08:00 • committed by David Sterba
parent 388f7b1d6e
commit 8dcddfa048
4 changed files with 25 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

8
fs/btrfs/disk-io.c
View file

@ -3146,6 +3146,12 @@ 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:
@ -3200,7 +3206,7 @@ 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);