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H A Dsuper.cdiff 52c198c6820f68b6fbe1d83f76e34a82bf736024 Thu Sep 11 17:18:13 CEST 2014 Lukas Czerner <lczerner@redhat.com> ext4: add sysfs entry showing whether the fs contains errors

Currently there is no easy way to tell that the mounted file system
contains errors other than checking for log messages, or reading the
information directly from superblock.

This patch adds new sysfs entries:

errors_count (number of fs errors we encounter)
first_error_time (unix timestamp for the first error we see)
last_error_time (unix timestamp for the last error we see)

If the file system is not marked as containing errors then any of the
file will return 0. Otherwise it will contain valid information. More
details about the errors should as always be found in the logs.

Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>