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md: introduce link/unlink_rdev() helpers
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There are places where sysfs links to rdev are handled
in a same way. Add the helper functions to consolidate
them.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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Namhyung Kim authored and NeilBrown committed Jul 27, 2011
1 parent 8bda470 commit 36fad85
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Showing 4 changed files with 36 additions and 50 deletions.
47 changes: 14 additions & 33 deletions drivers/md/md.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2459,7 +2459,6 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
{
char *e;
int err;
char nm[20];
int slot = simple_strtoul(buf, &e, 10);
if (strncmp(buf, "none", 4)==0)
slot = -1;
Expand All @@ -2482,8 +2481,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
hot_remove_disk(rdev->mddev, rdev->raid_disk);
if (err)
return err;
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&rdev->mddev->kobj, nm);
sysfs_unlink_rdev(rdev->mddev, rdev);
rdev->raid_disk = -1;
set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
md_wakeup_thread(rdev->mddev->thread);
Expand Down Expand Up @@ -2522,8 +2520,7 @@ slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
return err;
} else
sysfs_notify_dirent_safe(rdev->sysfs_state);
sprintf(nm, "rd%d", rdev->raid_disk);
if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
if (sysfs_link_rdev(rdev->mddev, rdev))
/* failure here is OK */;
/* don't wakeup anyone, leave that to userspace. */
} else {
Expand Down Expand Up @@ -3149,15 +3146,13 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
}

list_for_each_entry(rdev, &mddev->disks, same_set) {
char nm[20];
if (rdev->raid_disk < 0)
continue;
if (rdev->new_raid_disk >= mddev->raid_disks)
rdev->new_raid_disk = -1;
if (rdev->new_raid_disk == rdev->raid_disk)
continue;
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
sysfs_unlink_rdev(mddev, rdev);
}
list_for_each_entry(rdev, &mddev->disks, same_set) {
if (rdev->raid_disk < 0)
Expand All @@ -3168,11 +3163,10 @@ level_store(mddev_t *mddev, const char *buf, size_t len)
if (rdev->raid_disk < 0)
clear_bit(In_sync, &rdev->flags);
else {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
printk("md: cannot register %s for %s after level change\n",
nm, mdname(mddev));
if (sysfs_link_rdev(mddev, rdev))
printk(KERN_WARNING "md: cannot register rd%d"
" for %s after level change\n",
rdev->raid_disk, mdname(mddev));
}
}

Expand Down Expand Up @@ -4621,12 +4615,9 @@ int md_run(mddev_t *mddev)
smp_wmb();
mddev->ready = 1;
list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
if (rdev->raid_disk >= 0)
if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
}

set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);

Expand Down Expand Up @@ -4854,11 +4845,8 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open)
sysfs_notify_dirent_safe(mddev->sysfs_state);

list_for_each_entry(rdev, &mddev->disks, same_set)
if (rdev->raid_disk >= 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}
if (rdev->raid_disk >= 0)
sysfs_unlink_rdev(mddev, rdev);

set_capacity(disk, 0);
mutex_unlock(&mddev->open_mutex);
Expand Down Expand Up @@ -7077,9 +7065,7 @@ static int remove_and_add_spares(mddev_t *mddev)
atomic_read(&rdev->nr_pending)==0) {
if (mddev->pers->hot_remove_disk(
mddev, rdev->raid_disk)==0) {
char nm[20];
sprintf(nm,"rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
Expand All @@ -7096,10 +7082,7 @@ static int remove_and_add_spares(mddev_t *mddev)
rdev->recovery_offset = 0;
if (mddev->pers->
hot_add_disk(mddev, rdev) == 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
if (sysfs_create_link(&mddev->kobj,
&rdev->kobj, nm))
if (sysfs_link_rdev(mddev, rdev))
/* failure here is OK */;
spares++;
md_new_event(mddev);
Expand Down Expand Up @@ -7219,9 +7202,7 @@ void md_check_recovery(mddev_t *mddev)
atomic_read(&rdev->nr_pending)==0) {
if (mddev->pers->hot_remove_disk(
mddev, rdev->raid_disk)==0) {
char nm[20];
sprintf(nm,"rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
Expand Down
14 changes: 14 additions & 0 deletions drivers/md/md.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -413,6 +413,20 @@ static inline char * mdname (mddev_t * mddev)
return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
}

static inline int sysfs_link_rdev(mddev_t *mddev, mdk_rdev_t *rdev)
{
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
}

static inline void sysfs_unlink_rdev(mddev_t *mddev, mdk_rdev_t *rdev)
{
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}

/*
* iterates through some rdev ringlist. It's safe to remove the
* current 'rdev'. Dont touch 'tmp' though.
Expand Down
15 changes: 5 additions & 10 deletions drivers/md/raid1.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2159,18 +2159,13 @@ static int raid1_reshape(mddev_t *mddev)
for (d = d2 = 0; d < conf->raid_disks; d++) {
mdk_rdev_t *rdev = conf->mirrors[d].rdev;
if (rdev && rdev->raid_disk != d2) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = d2;
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
if (sysfs_create_link(&mddev->kobj,
&rdev->kobj, nm))
sysfs_unlink_rdev(mddev, rdev);
if (sysfs_link_rdev(mddev, rdev))
printk(KERN_WARNING
"md/raid1:%s: cannot register "
"%s\n",
mdname(mddev), nm);
"md/raid1:%s: cannot register rd%d\n",
mdname(mddev), rdev->raid_disk);
}
if (rdev)
newmirrors[d2++].rdev = rdev;
Expand Down
10 changes: 3 additions & 7 deletions drivers/md/raid5.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -5152,16 +5152,14 @@ static int raid5_start_reshape(mddev_t *mddev)
if (rdev->raid_disk < 0 &&
!test_bit(Faulty, &rdev->flags)) {
if (raid5_add_disk(mddev, rdev) == 0) {
char nm[20];
if (rdev->raid_disk
>= conf->previous_raid_disks) {
set_bit(In_sync, &rdev->flags);
added_devices++;
} else
rdev->recovery_offset = 0;
sprintf(nm, "rd%d", rdev->raid_disk);
if (sysfs_create_link(&mddev->kobj,
&rdev->kobj, nm))

if (sysfs_link_rdev(mddev, rdev))
/* Failure here is OK */;
}
} else if (rdev->raid_disk >= conf->previous_raid_disks
Expand Down Expand Up @@ -5257,9 +5255,7 @@ static void raid5_finish_reshape(mddev_t *mddev)
d++) {
mdk_rdev_t *rdev = conf->disks[d].rdev;
if (rdev && raid5_remove_disk(mddev, d) == 0) {
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
sysfs_unlink_rdev(mddev, rdev);
rdev->raid_disk = -1;
}
}
Expand Down

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