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Message-ID: <9beddcc315595751d5fbcb83f73cd94533b62cbd.camel@kernel.org>
Date: Wed, 27 Apr 2022 11:07:40 -0400
From: Jeff Layton <jlayton@...nel.org>
To: Luís Henriques <lhenriques@...e.de>,
Xiubo Li <xiubli@...hat.com>, Ilya Dryomov <idryomov@...il.com>
Cc: ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
Ryan Taylor <rptaylor@...c.ca>
Subject: Re: [PATCH v2] ceph: fix statfs for subdir mounts
On Wed, 2022-04-27 at 15:33 +0100, Luís Henriques wrote:
> When doing a mount using as base a directory that has 'max_bytes' quotas
> statfs uses that value as the total; if a subdirectory is used instead,
> the same 'max_bytes' too in statfs, unless there is another quota set.
>
> Unfortunately, if this subdirectory only has the 'max_files' quota set,
> then statfs uses the filesystem total. Fix this by making sure we only
> lookup realms that contain the 'max_bytes' quota.
>
> Link: https://tracker.ceph.com/issues/55090
> Cc: Ryan Taylor <rptaylor@...c.ca>
> Signed-off-by: Luís Henriques <lhenriques@...e.de>
> ---
> As I mentioned in v1, I do *not* think this really fixes the tracker
> above, as the bug reporter never mentioned setting quotas in the subdir.
>
> Changes since v1:
> Moved some more logic into __ceph_has_any_quota() function.
>
> fs/ceph/inode.c | 2 +-
> fs/ceph/quota.c | 19 +++++++++++--------
> fs/ceph/super.h | 28 ++++++++++++++++++++++++----
> 3 files changed, 36 insertions(+), 13 deletions(-)
>
> diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
> index 5de7bb9048b7..4b7406d6fbe4 100644
> --- a/fs/ceph/inode.c
> +++ b/fs/ceph/inode.c
> @@ -691,7 +691,7 @@ void ceph_evict_inode(struct inode *inode)
>
> __ceph_remove_caps(ci);
>
> - if (__ceph_has_any_quota(ci))
> + if (__ceph_has_any_quota(ci, QUOTA_GET_ANY))
> ceph_adjust_quota_realms_count(inode, false);
>
> /*
> diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
> index a338a3ec0dc4..e9f7ca18cdb7 100644
> --- a/fs/ceph/quota.c
> +++ b/fs/ceph/quota.c
> @@ -195,9 +195,9 @@ void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc)
>
> /*
> * This function walks through the snaprealm for an inode and returns the
> - * ceph_snap_realm for the first snaprealm that has quotas set (either max_files
> - * or max_bytes). If the root is reached, return the root ceph_snap_realm
> - * instead.
> + * ceph_snap_realm for the first snaprealm that has quotas set (max_files,
> + * max_bytes, or any, depending on the 'which_quota' argument). If the root is
> + * reached, return the root ceph_snap_realm instead.
> *
> * Note that the caller is responsible for calling ceph_put_snap_realm() on the
> * returned realm.
> @@ -209,7 +209,9 @@ void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc)
> * will be restarted.
> */
> static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
> - struct inode *inode, bool retry)
> + struct inode *inode,
> + enum quota_get_realm which_quota,
> + bool retry)
> {
> struct ceph_inode_info *ci = NULL;
> struct ceph_snap_realm *realm, *next;
> @@ -248,7 +250,7 @@ static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
> }
>
> ci = ceph_inode(in);
> - has_quota = __ceph_has_any_quota(ci);
> + has_quota = __ceph_has_any_quota(ci, which_quota);
> iput(in);
>
> next = realm->parent;
> @@ -279,8 +281,8 @@ bool ceph_quota_is_same_realm(struct inode *old, struct inode *new)
> * dropped and we can then restart the whole operation.
> */
> down_read(&mdsc->snap_rwsem);
> - old_realm = get_quota_realm(mdsc, old, true);
> - new_realm = get_quota_realm(mdsc, new, false);
> + old_realm = get_quota_realm(mdsc, old, QUOTA_GET_ANY, true);
> + new_realm = get_quota_realm(mdsc, new, QUOTA_GET_ANY, false);
> if (PTR_ERR(new_realm) == -EAGAIN) {
> up_read(&mdsc->snap_rwsem);
> if (old_realm)
> @@ -483,7 +485,8 @@ bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, struct kstatfs *buf)
> bool is_updated = false;
>
> down_read(&mdsc->snap_rwsem);
> - realm = get_quota_realm(mdsc, d_inode(fsc->sb->s_root), true);
> + realm = get_quota_realm(mdsc, d_inode(fsc->sb->s_root),
> + QUOTA_GET_MAX_BYTES, true);
> up_read(&mdsc->snap_rwsem);
> if (!realm)
> return false;
> diff --git a/fs/ceph/super.h b/fs/ceph/super.h
> index a2e1c83ab29a..3cd96720f14a 100644
> --- a/fs/ceph/super.h
> +++ b/fs/ceph/super.h
> @@ -1317,9 +1317,29 @@ extern void ceph_fs_debugfs_init(struct ceph_fs_client *client);
> extern void ceph_fs_debugfs_cleanup(struct ceph_fs_client *client);
>
> /* quota.c */
> -static inline bool __ceph_has_any_quota(struct ceph_inode_info *ci)
> +
> +enum quota_get_realm {
> + QUOTA_GET_MAX_FILES,
> + QUOTA_GET_MAX_BYTES,
> + QUOTA_GET_ANY
> +};
> +
> +static inline bool __ceph_has_any_quota(struct ceph_inode_info *ci,
> + enum quota_get_realm which)
> {
> - return ci->i_max_files || ci->i_max_bytes;
> + bool has_quota = false;
> +
> + switch (which) {
> + case QUOTA_GET_MAX_BYTES:
> + has_quota = !!ci->i_max_bytes;
> + break;
> + case QUOTA_GET_MAX_FILES:
> + has_quota = !!ci->i_max_files;
> + break;
> + default:
> + has_quota = !!(ci->i_max_files || ci->i_max_bytes);
> + }
> + return has_quota;
> }
>
> extern void ceph_adjust_quota_realms_count(struct inode *inode, bool inc);
> @@ -1328,10 +1348,10 @@ static inline void __ceph_update_quota(struct ceph_inode_info *ci,
> u64 max_bytes, u64 max_files)
> {
> bool had_quota, has_quota;
> - had_quota = __ceph_has_any_quota(ci);
> + had_quota = __ceph_has_any_quota(ci, QUOTA_GET_ANY);
> ci->i_max_bytes = max_bytes;
> ci->i_max_files = max_files;
> - has_quota = __ceph_has_any_quota(ci);
> + has_quota = __ceph_has_any_quota(ci, QUOTA_GET_ANY);
>
> if (had_quota != has_quota)
> ceph_adjust_quota_realms_count(&ci->vfs_inode, has_quota);
Code looks fine. I think Xiubo had suggested renaming the funtion to
__ceph_has_quota(), but other than that this looks good.
Reviewed-by: Jeff Layton <jlayton@...nel.org>
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