From: NeilBrown The md/dev-XXX/state file can now be written: "faulty" simulates an error on the device "remove" removes the device from the array (if it is not busy) Signed-off-by: Neil Brown Signed-off-by: Andrew Morton --- Documentation/md.txt | 3 +++ drivers/md/md.c | 26 +++++++++++++++++++++++++- 2 files changed, 28 insertions(+), 1 deletion(-) diff -puN Documentation/md.txt~md-allow-rdev-state-to-be-set-via-sysfs Documentation/md.txt --- devel/Documentation/md.txt~md-allow-rdev-state-to-be-set-via-sysfs 2006-05-31 22:28:20.000000000 -0700 +++ devel-akpm/Documentation/md.txt 2006-05-31 22:28:20.000000000 -0700 @@ -302,6 +302,9 @@ Each directory contains: This includes spares that are in the process of being recoverred to This list make grow in future. + This can be written to. + Writing "faulty" simulates a failure on the device. + Writing "remove" removes the device from the array. errors An approximate count of read errors that have been detected on diff -puN drivers/md/md.c~md-allow-rdev-state-to-be-set-via-sysfs drivers/md/md.c --- devel/drivers/md/md.c~md-allow-rdev-state-to-be-set-via-sysfs 2006-05-31 22:28:20.000000000 -0700 +++ devel-akpm/drivers/md/md.c 2006-05-31 22:28:20.000000000 -0700 @@ -1745,8 +1745,32 @@ state_show(mdk_rdev_t *rdev, char *page) return len+sprintf(page+len, "\n"); } +static ssize_t +state_store(mdk_rdev_t *rdev, const char *buf, size_t len) +{ + /* can write + * faulty - simulates and error + * remove - disconnects the device + */ + int err = -EINVAL; + if (cmd_match(buf, "faulty") && rdev->mddev->pers) { + md_error(rdev->mddev, rdev); + err = 0; + } else if (cmd_match(buf, "remove")) { + if (rdev->raid_disk >= 0) + err = -EBUSY; + else { + mddev_t *mddev = rdev->mddev; + kick_rdev_from_array(rdev); + md_update_sb(mddev); + md_new_event(mddev); + err = 0; + } + } + return err ? err : len; +} static struct rdev_sysfs_entry -rdev_state = __ATTR_RO(state); +rdev_state = __ATTR(state, 0644, state_show, state_store); static ssize_t super_show(mdk_rdev_t *rdev, char *page) _