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authorLukas Czerner <lczerner@redhat.com>2014-09-11 11:27:58 -0400
committerTheodore Ts'o <tytso@mit.edu>2014-09-11 11:27:58 -0400
commitc7f725435adcf2ade4b9152ee33339d28f4cc330 (patch)
tree5672bc82a86e6c21ebe47b2b62a32cadf65037e7 /fs/jbd2
parent52c198c6820f68b6fbe1d83f76e34a82bf736024 (diff)
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ext4: provide separate operations for sysfs feature files
Currently sysfs feature files uses ext4_attr_ops as the file operations to show/store data. However the feature files is not supposed to contain any data at all, the sole existence of the file means that the module support the feature. Moreover, none of the sysfs feature attributes actually register show/store functions so that would not be a problem. However if a sysfs feature attribute register a show or store function we might be in trouble because the kobject in this case is _not_ embedded in the ext4_sb_info structure as ext4_attr_show/store expect. So just to be safe, provide separate empty sysfs_ops to use in ext4_feat_ktype. This might safe us from potential problems in the future. As a bonus we can "store" something more descriptive than nothing in the files, so let it contain "enabled" to make it clear that the feature is really present in the module. Signed-off-by: Lukas Czerner <lczerner@redhat.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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