[PATCH] imsm: FIX: getinfo_super_imsm_volume() doesn"t fill all disk

From: Adam Kwolek

Issue:
getinfo_super_imsm_volume() clears entire 'info' structure before filling with new
information. Disk number and raid_disk can be required later by caller
but it is also cleared.

Resolution:
Patch backs up all disk information before zeroing info structure and
restore it before function return.
The patch aslo reverses workaround for the same problem introduced
in commit:

80e4abc99c7f5a16c56c1c4084bfad63aec03c01
FIX: Cannot create volume

Signed-off-by: Adam Kwolek
Signed-off-by: Krzysztof Wojcik
---
Create.c | 9 ---------
super-intel.c | 13 ++++++++++++-
2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/Create.c b/Create.c
index 48115db..8d88aa1 100644
--- a/Create.c
+++ b/Create.c
@@ -856,15 +856,6 @@ int Create(struct supertype *st, char *mddev,
/* getinfo_super might have lost these ... */
inf->disk.major = major(stb.st_rdev);
inf->disk.minor = minor(stb.st_rdev);
- /* FIXME the following should not be needed
- * as getinfo_super is suppose to set
- * them. However it doesn't for imsm,
- * so we have this hack for now
- */
- if (st->ss == &super_imsm) {
- inf->disk.number = dnum;
- inf->disk.raid_disk = dnum;
- }
}
break;
case 2:
diff --git a/super-intel.c b/super-intel.c
index 0bddc6b..e3a693c 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -2204,11 +2204,20 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
unsigned int component_size_alligment;
int map_disks = info->array.raid_disks;

- memset(info, 0, sizeof(*info));
if (prev_map)
map_to_analyse = prev_map;

+ /* find requested (by info->disk.number) disk on the list */
dl = super->disks;
+ while (dl) {
+ if (dl->index == info->disk.number)
+ break;
+ dl = dl->next;
+ }
+ if (!dl)
+ dl = super->disks;
+
+ memset(info, 0, sizeof(*info));

info->container_member = super->current_vol;
info->array.raid_disks = map->num_members;
@@ -2275,6 +2284,8 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
if (dl) {
info->disk.major = dl->major;
info->disk.minor = dl->minor;
+ info->disk.number = dl->index;
+ info->disk.raid_disk = dl->index;
}

info->data_offset = __le32_to_cpu(map_to_analyse->pba_of_lba0);

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Re: [PATCH] imsm: FIX: getinfo_super_imsm_volume() doesn"t fill alldisk information

On Fri, 01 Jul 2011 18:34:48 +0200 Krzysztof Wojcik
wrote:

> From: Adam Kwolek
>
> Issue:
> getinfo_super_imsm_volume() clears entire 'info' structure before filling with new
> information. Disk number and raid_disk can be required later by caller
> but it is also cleared.
>
> Resolution:
> Patch backs up all disk information before zeroing info structure and
> restore it before function return.
> The patch aslo reverses workaround for the same problem introduced
> in commit:
>
> 80e4abc99c7f5a16c56c1c4084bfad63aec03c01
> FIX: Cannot create volume
>
> Signed-off-by: Adam Kwolek
> Signed-off-by: Krzysztof Wojcik
> ---
> Create.c | 9 ---------
> super-intel.c | 13 ++++++++++++-
> 2 files changed, 12 insertions(+), 10 deletions(-)
>
> diff --git a/Create.c b/Create.c
> index 48115db..8d88aa1 100644
> --- a/Create.c
> +++ b/Create.c
> @@ -856,15 +856,6 @@ int Create(struct supertype *st, char *mddev,
> /* getinfo_super might have lost these ... */
> inf->disk.major = major(stb.st_rdev);
> inf->disk.minor = minor(stb.st_rdev);
> - /* FIXME the following should not be needed
> - * as getinfo_super is suppose to set
> - * them. However it doesn't for imsm,
> - * so we have this hack for now
> - */
> - if (st->ss == &super_imsm) {
> - inf->disk.number = dnum;
> - inf->disk.raid_disk = dnum;
> - }
> }
> break;
> case 2:
> diff --git a/super-intel.c b/super-intel.c
> index 0bddc6b..e3a693c 100644
> --- a/super-intel.c
> +++ b/super-intel.c
> @@ -2204,11 +2204,20 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
> unsigned int component_size_alligment;
> int map_disks = info->array.raid_disks;
>
> - memset(info, 0, sizeof(*info));
> if (prev_map)
> map_to_analyse = prev_map;
>
> + /* find requested (by info->disk.number) disk on the list */
> dl = super->disks;
> + while (dl) {
> + if (dl->index == info->disk.number)
> + break;
> + dl = dl->next;
> + }
> + if (!dl)
> + dl = super->disks;
> +
> + memset(info, 0, sizeof(*info));
>
> info->container_member = super->current_vol;
> info->array.raid_disks = map->num_members;
> @@ -2275,6 +2284,8 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
> if (dl) {
> info->disk.major = dl->major;
> info->disk.minor = dl->minor;
> + info->disk.number = dl->index;
> + info->disk.raid_disk = dl->index;
> }
>
> info->data_offset = __le32_to_cpu(map_to_analyse->pba_of_lba0);
>

I'm sorry, but this is still wrong. Sometimes getinfo_super_imsm_volume
is called with an uninitialised 'info' so using any value for any field it
in is wrong (with the exception that if 'map' is not NULL, then
array.raid_disks must be set).

Here is the correct patch which I have now applied.

NeilBrown

commit ca0748fa494425dc025441a8622088126e25e61d
Author: NeilBrown
Date: Thu Jul 14 15:42:10 2011 +1000

imsm: getinfo_super_imsm_volume() doesn't fill all disk information

getinfo_super_imsm_volume doesn't correctly set info.disk fields
because it doesn't know which disk to set them from.
It should be the last disk passed to add_to_super.

So add a field 'current_disk' to record this disk in add_to_super, and
use it in getinfo_super.

This allows us to remove a hack in Create.c

Signed-off-by: NeilBrown

diff --git a/Create.c b/Create.c
index 48115db..8d88aa1 100644
--- a/Create.c
+++ b/Create.c
@@ -856,15 +856,6 @@ int Create(struct supertype *st, char *mddev,
/* getinfo_super might have lost these ... */
inf->disk.major = major(stb.st_rdev);
inf->disk.minor = minor(stb.st_rdev);
- /* FIXME the following should not be needed
- * as getinfo_super is suppose to set
- * them. However it doesn't for imsm,
- * so we have this hack for now
- */
- if (st->ss == &super_imsm) {
- inf->disk.number = dnum;
- inf->disk.raid_disk = dnum;
- }
}
break;
case 2:
diff --git a/super-intel.c b/super-intel.c
index 70cf993..b5868e9 100644
--- a/super-intel.c
+++ b/super-intel.c
@@ -341,7 +341,7 @@ struct intel_super {
struct extent *e; /* for determining freespace @ create */
int raiddisk; /* slot to fill in autolayout */
enum action action;
- } *disks;
+ } *disks, *current_disk;
struct dl *disk_mgmt_list; /* list of disks to add/remove while mdmon
active */
struct dl *missing; /* disks removed while we weren't looking */
@@ -2201,7 +2201,7 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
if (prev_map)
map_to_analyse = prev_map;

- dl = super->disks;
+ dl = super->current_disk;

info->container_member = super->current_vol;
info->array.raid_disks = map->num_members;
@@ -2263,11 +2263,12 @@ static void getinfo_super_imsm_volume(struct supertype *st, struct mdinfo *info,
info->new_chunk = info->array.chunk_size;
info->delta_disks = 0;
}
- info->disk.major = 0;
- info->disk.minor = 0;
+
if (dl) {
info->disk.major = dl->major;
info->disk.minor = dl->minor;
+ info->disk.number = dl->index;
+ info->disk.raid_disk = dl->index;
}

info->data_offset = __le32_to_cpu(map_to_analyse->pba_of_lba0);
@@ -4349,7 +4350,7 @@ static int add_to_super_imsm_volume(struct supertype *st, mdu_disk_info_t *dk,
mpb->family_num = __cpu_to_le32(sum);
mpb->orig_family_num = mpb->family_num;
}
-
+ super->current_disk = dl;
return 0;
}

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