diff options
| author |   NeilBrown <neilb@suse.de> | 2006-01-06 00:20:55 -0800 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@g5.osdl.org> | 2006-01-06 08:34:09 -0800 |
| commit | 014236d2b8ec6faea2a6134ab8e019d84d67b524 (patch) | |
| tree | 80f655fe0631f56544b96f2b9750f93e327b23de | |
| parent | [PATCH] md: keep better track of dev/array size when assembling md arrays (diff) | |
| download | linux-dev-014236d2b8ec6faea2a6134ab8e019d84d67b524.tar.xz linux-dev-014236d2b8ec6faea2a6134ab8e019d84d67b524.zip | |
[PATCH] md: expose device slot information via sysfs
This the role that a device has in an array can be viewed and set.
Signed-off-by: Neil Brown <neilb@suse.de>
Acked-by: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | Documentation/md.txt | 8 | ||||
| -rw-r--r-- | drivers/md/md.c | 35 |
2 files changed, 43 insertions, 0 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt index 69f742dee00f..d525fffc873b 100644 --- a/Documentation/md.txt +++ b/Documentation/md.txt @@ -236,6 +236,14 @@ Each directory contains: providing an ongoing count for arrays with metadata managed by userspace. + slot + This gives the role that the device has in the array. It will + either be 'none' if the device is not active in the array + (i.e. is a spare or has failed) or an integer less than the + 'raid_disks' number for the array indicating which possition + it currently fills. This can only be set while assembling an + array. A device for which this is set is assumed to be working. + An active md device will also contain and entry for each active device in the array. These are named diff --git a/drivers/md/md.c b/drivers/md/md.c index 27a9871f3057..a8169564209d 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1630,10 +1630,45 @@ errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) static struct rdev_sysfs_entry rdev_errors = __ATTR(errors, 0644, errors_show, errors_store); +static ssize_t +slot_show(mdk_rdev_t *rdev, char *page) +{ + if (rdev->raid_disk < 0) + return sprintf(page, "none\n"); + else + return sprintf(page, "%d\n", rdev->raid_disk); +} + +static ssize_t +slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) +{ + char *e; + int slot = simple_strtoul(buf, &e, 10); + if (strncmp(buf, "none", 4)==0) + slot = -1; + else if (e==buf || (*e && *e!= '\n')) + return -EINVAL; + if (rdev->mddev->pers) + /* Cannot set slot in active array (yet) */ + return -EBUSY; + if (slot >= rdev->mddev->raid_disks) + return -ENOSPC; + rdev->raid_disk = slot; + /* assume it is working */ + rdev->flags = 0; + set_bit(In_sync, &rdev->flags); + return len; +} + + +static struct rdev_sysfs_entry rdev_slot = +__ATTR(slot, 0644, slot_show, slot_store); + static struct attribute *rdev_default_attrs[] = { &rdev_state.attr, &rdev_super.attr, &rdev_errors.attr, + &rdev_slot.attr, NULL, }; static ssize_t |