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ceph: fix statfs for subdir mounts

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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.

Cc: Ryan Taylor <rptaylor@uvic.ca>
URL: https://tracker.ceph.com/issues/55090
Signed-off-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Luís Henriques 2022-04-27 16:57:04 +01:00 committed by Ilya Dryomov
parent 825978fd6a
commit 55ab552080
3 changed files with 36 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/ceph/inode.c
View File

@ -578,7 +578,7 @@ void ceph_evict_inode(struct inode *inode)
__ceph_remove_caps(ci);
if (__ceph_has_any_quota(ci))
if (__ceph_has_quota(ci, QUOTA_GET_ANY))
ceph_adjust_quota_realms_count(inode, false);
/*

19
fs/ceph/quota.c
View File

@ -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 @@ restart:
}
ci = ceph_inode(in);
has_quota = __ceph_has_any_quota(ci);
has_quota = __ceph_has_quota(ci, which_quota);
iput(in);
next = realm->parent;
@ -279,8 +281,8 @@ restart:
* 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;

28
fs/ceph/super.h
View File

@ -1279,9 +1279,29 @@ 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_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);
@ -1290,10 +1310,10 @@ 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_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_quota(ci, QUOTA_GET_ANY);
if (had_quota != has_quota)
ceph_adjust_quota_realms_count(&ci->vfs_inode, has_quota);