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Date: Wed, 27 Apr 2022 15:33:03 +0100
From: Luís Henriques <lhenriques@...e.de>
To: Jeff Layton <jlayton@...nel.org>, Xiubo Li <xiubli@...hat.com>,
Ilya Dryomov <idryomov@...il.com>
Cc: ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
Luís Henriques <lhenriques@...e.de>,
Ryan Taylor <rptaylor@...c.ca>
Subject: [PATCH v2] ceph: fix statfs for subdir mounts
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);
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