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Bug 2356271

Summary:	CephFS-NFS - mounted nfs shares overestimate/show wrong filesystem sizes on the mount
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Goutham Pacha Ravi <gouthamr>
Component:	NFS-Ganesha	Assignee:	Frank Filz <ffilz>
Status:	CLOSED DUPLICATE	QA Contact:	Manisha Saini <msaini>
Severity:	medium	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	cephqe-warriors, kkeithle
Target Milestone:	---
Target Release:	8.1z3
Hardware:	All
OS:	All
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2025-08-27 22:27:36 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Goutham Pacha Ravi 2025-03-31 17:27:09 UTC

Description of problem:

This bug was reported against openstack-manila as: https://issues.redhat.com/browse/OSPRH-13323

When you create a 10GB NFS share with manila and mount it to a system,  the size shown on the client is 1.3TB

The quota on the underlying CephFS filesystem is in place and we cannot write to the nfs share more then 10GB.



cjanisze@fedora-vm ~/D/p/o/manila-share> openstack share list --insecure --project chrisj
+--------------------------------------+-------+------+-------------+-----------+-----------+-----------------+----------------------------+-------------------+
| ID                                   | Name  | Size | Share Proto | Status    | Is Public | Share Type Name | Host                       | Availability Zone |
+--------------------------------------+-------+------+-------------+-----------+-----------+-----------------+----------------------------+-------------------+
| 99b2f52b-3454-4966-8164-9cc8f34c547f | test1 |   10 | NFS         | available | False     | nfs             | hostgroup@cephfsnfs#cephfs | nova              |
+--------------------------------------+-------+------+-------------+-----------+-----------+-----------------+----------------------------+-------------------+


cjanisze@fedora-vm ~/D/p/o/manila-share [2]> openstack share show 99b2f52b-3454-4966-8164-9cc8f34c547f --insecure
+---------------------------------------+-------------------------------------------------------------------------------------------------------------------+
| Field                                 | Value                                                                                                             |
+---------------------------------------+-------------------------------------------------------------------------------------------------------------------+
| access_rules_status                   | active                                                                                                            |
| availability_zone                     | nova                                                                                                              |
| create_share_from_snapshot_support    | False                                                                                                             |
| created_at                            | 2025-01-23T15:05:37.658014                                                                                        |
| description                           | None                                                                                                              |
| export_locations                      |                                                                                                                   |
|                                       | id = e2c3278c-8aee-4d47-8568-1951da2f0447                                                                         |
|                                       | path = 172.20.138.250:/volumes/_nogroup/d78c21fa-dba3-4c08-9f3b-505eeebf84ac/73ad23f3-300a-426e-b7cf-6ffa53010cff |
|                                       | preferred = True                                                                                                  |
|                                       | share_instance_id = d78c21fa-dba3-4c08-9f3b-505eeebf84ac                                                          |
|                                       | is_admin_only = False                                                                                             |
| has_replicas                          | False                                                                                                             |
| host                                  | hostgroup@cephfsnfs#cephfs                                                                                        |
| id                                    | 99b2f52b-3454-4966-8164-9cc8f34c547f                                                                              |
| is_public                             | False                                                                                                             |
| is_soft_deleted                       | False                                                                                                             |
| mount_snapshot_support                | False                                                                                                             |
| name                                  | test1                                                                                                             |
| progress                              | 100%                                                                                                              |
| project_id                            | 1e7b48f0eadd4dcd951e87bb961e15e8                                                                                  |
| properties                            |                                                                                                                   |
| replication_type                      | None                                                                                                              |
| revert_to_snapshot_support            | False                                                                                                             |
| scheduled_to_be_deleted_at            | None                                                                                                              |
| share_group_id                        | None                                                                                                              |
| share_network_id                      | None                                                                                                              |
| share_proto                           | NFS                                                                                                               |
| share_server_id                       | None                                                                                                              |
| share_type                            | a8e2fb0e-d59e-4b2d-8c7f-fa79e1618c38                                                                              |
| share_type_name                       | nfs                                                                                                               |
| size                                  | 10                                                                                                                |
| snapshot_id                           | None                                                                                                              |
| snapshot_support                      | False                                                                                                             |
| source_share_group_snapshot_member_id | None                                                                                                              |
| status                                | available                                                                                                         |
| task_state                            | None                                                                                                              |
| user_id                               | b41657d7d4134f8c907d1f6bda32e934                                                                                  |
| volume_type                           | nfs                                                                                                               |
+---------------------------------------+-------------------------------------------------------------------------------------------------------------------+


[root@rhel94-vm1 ~]# mount -t nfs 172.20.138.250:/volumes/_nogroup/d78c21fa-dba3-4c08-9f3b-505eeebf84ac/73ad23f3-300a-426e-b7cf-6ffa53010cff  /mnt


[root@rhel94-vm1 ~]# df -h
Filesystem                                                                                                  Size  Used Avail Use% Mounted on
devtmpfs                                                                                                    4.0M     0  4.0M   0% /dev
tmpfs                                                                                                       888M     0  888M   0% /dev/shm
tmpfs                                                                                                       356M  9.7M  346M   3% /run
/dev/vda4                                                                                                   8.8G  1.5G  7.3G  17% /
/dev/vda3                                                                                                   960M  170M  791M  18% /boot
/dev/vda2                                                                                                   200M  7.1M  193M   4% /boot/efi
tmpfs                                                                                                       178M     0  178M   0% /run/user/0
tmpfs                                                                                                       178M     0  178M   0% /run/user/1000
172.20.138.250:/volumes/_nogroup/d78c21fa-dba3-4c08-9f3b-505eeebf84ac/73ad23f3-300a-426e-b7cf-6ffa53010cff  1.3T     0  1.3T   0% /mnt

[root@rhel94-vm1 mnt]# for i in {1..11}; do dd if=/dev/zero of=/mnt/test$i.img bs=1G count=1 oflag=dsync; done
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.75783 s, 389 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.64177 s, 295 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.87453 s, 374 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 3.04324 s, 353 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.58057 s, 416 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.83895 s, 378 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.57254 s, 417 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.63475 s, 408 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.66892 s, 402 MB/s
1+0 records in
1+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.64982 s, 405 MB/s
dd: error writing '/mnt/test11.img': Disk quota exceeded
1+0 records in
0+0 records out
0 bytes copied, 1.57725 s, 0.0 kB/s


[root@rhel94-vm1 mnt]# df -h
Filesystem                                                                                                  Size  Used Avail Use% Mounted on
devtmpfs                                                                                                    4.0M     0  4.0M   0% /dev
tmpfs                                                                                                       888M     0  888M   0% /dev/shm
tmpfs                                                                                                       356M  9.7M  346M   3% /run
/dev/vda4                                                                                                   8.8G  1.5G  7.3G  17% /
/dev/vda3                                                                                                   960M  170M  791M  18% /boot
/dev/vda2                                                                                                   200M  7.1M  193M   4% /boot/efi
tmpfs                                                                                                       178M     0  178M   0% /run/user/0
tmpfs                                                                                                       178M     0  178M   0% /run/user/1000
172.20.138.250:/volumes/_nogroup/d78c21fa-dba3-4c08-9f3b-505eeebf84ac/73ad23f3-300a-426e-b7cf-6ffa53010cff  1.3T   10G  1.3T   1% /mnt


 [root@edpm-compute-0 ceph]# ceph fs subvolume info cephfs d78c21fa-dba3-4c08-9f3b-505eeebf84ac
{
    "atime": "2025-01-23 15:05:38",
    "bytes_pcent": "0.00",
    "bytes_quota": 10737418240,
    "bytes_used": 15,
    "created_at": "2025-01-23 15:05:38",
    "ctime": "2025-01-23 15:09:45",
    "data_pool": "cephfs.cephfs.data",
    "features": [
        "snapshot-clone",
        "snapshot-autoprotect",
        "snapshot-retention"
    ],
    "flavor": 2,
    "gid": 0,
    "mode": 16895,
    "mon_addrs": [
        "172.20.142.100:6789",
        "172.20.142.102:6789",
        "172.20.142.101:6789"
    ],
    "mtime": "2025-01-23 15:09:45",
    "path": "/volumes/_nogroup/d78c21fa-dba3-4c08-9f3b-505eeebf84ac/73ad23f3-300a-426e-b7cf-6ffa53010cff",
    "pool_namespace": "fsvolumens_d78c21fa-dba3-4c08-9f3b-505eeebf84ac",
    "state": "complete",
    "type": "subvolume",
    "uid": 0
}


Version-Release number of selected component (if applicable): 


- Ceph Version rhceph:7-493
- NFS-Ganesha package versions:
nfs-utils-2.5.4-27.el9.x86_64
nfs-ganesha-selinux-5.7-5.el9cp.noarch
nfs-ganesha-5.7-5.el9cp.x86_64
nfs-ganesha-rgw-5.7-5.el9cp.x86_64
nfs-ganesha-ceph-5.7-5.el9cp.x86_64
nfs-ganesha-rados-grace-5.7-5.el9cp.x86_64
nfs-ganesha-rados-urls-5.7-5.el9cp.x86_64


How reproducible: Always


Steps to Reproduce:
1. Create an OpenStack Manila share (CephFS subvolume) of size X GiB
2. Allow client access to share (Export the subvolume via NFS)
3. Mount the share on a linux host and use "df -h" on the mounted filesystem

Actual results:

The "size" attribute under df shows a much larger size than the quota of the share in question; the "used" attribute shows all the quota as being "used" even on a seemingly empty share. Due to this disparity, the "used %" is incorrect/useless. 



Expected results:

The "size" attribute must reflect the quota allocated to the subvolume, and the "used" attribute must reflect the space consumed by files within the subvolume.

Comment 1 Goutham Pacha Ravi 2025-08-27 22:27:36 UTC

This bug is a duplicate; see progress and further comments on https://bugzilla.redhat.com/show_bug.cgi?id=2248613

*** This bug has been marked as a duplicate of bug 2248613 ***