On Friday, 09 December, 2011 17:40:25 Stefan Behrens wrote: > The goal is to detect when drives start to get an increased error rate, > when drives should be replaced soon. Therefore statistic counters are > added that count IO errors (read, write and flush). Additionally, the > software detected errors like checksum errors and corrupted blocks are > counted. > > An ioctl interface is added to get the device statistic counters. > A second ioctl is added to atomically get and reset these counters. Hi Stefan, what about exporting these information under /sys ? Something like: /sys/fs/btrfs/devices/<uuid>/error/cnt_write_io_errs /sys/fs/btrfs/devices/<uuid>/error/cnt_read_io_errs /sys/fs/btrfs/devices/<uuid>/error/cnt_flush_io_errs /sys/fs/btrfs/devices/<uuid>/error/cnt_corruption_errs /sys/fs/btrfs/devices/<uuid>/error/cnt_generation_errs /sys/fs/btrfs/devices/<uuid>/error/cnt_write_io_errs_0 /sys/fs/btrfs/devices/<uuid>/error/cnt_read_io_errs_0 /sys/fs/btrfs/devices/<uuid>/error/cnt_flush_io_errs_0 /sys/fs/btrfs/devices/<uuid>/error/cnt_corruption_errs_0 /sys/fs/btrfs/devices/<uuid>/error/cnt_generation_errs_0 where the '_0' family are for "read and reset" behaviour. This would be very flexible when another count will be added... > The device statistics are written into the device tree with each > transaction commit. Only modified statistics are written. > When a filesystem is mounted, the device statistic for each involved > device are read from the device tree and used to initialize the > counters. > > A patch for the btrfs-progs world will also be sent. > > The patches are based on v3.1-161-gf4a8e65 (btrfs pull request from > 12/1/2011). > > Stefan Behrens (3): > Btrfs: add device counters for detected IO and checksum errors > Btrfs: add ioctl to get and reset the device stats > Btrfs: read device stats on mount, write modified ones during commit > > fs/btrfs/ctree.h | 51 ++++++++ > fs/btrfs/disk-io.c | 25 +++- > fs/btrfs/extent_io.c | 27 ++++- > fs/btrfs/ioctl.c | 26 ++++ > fs/btrfs/ioctl.h | 27 ++++ > fs/btrfs/print-tree.c | 3 + > fs/btrfs/scrub.c | 52 ++++++-- > fs/btrfs/transaction.c | 4 + > fs/btrfs/volumes.c | 335 > +++++++++++++++++++++++++++++++++++++++++++++++- fs/btrfs/volumes.h | > 43 ++++++ > 10 files changed, 575 insertions(+), 18 deletions(-) -- gpg key@ keyserver.linux.it: Goffredo Baroncelli (ghigo) <kreijack@xxxxxxxxx> Key fingerprint = 4769 7E51 5293 D36C 814E C054 BF04 F161 3DC5 0512 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
