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![Luís Henriques](/assets/img/avatar_default.png)
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>
535 lines
14 KiB
C
535 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* quota.c - CephFS quota
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*
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* Copyright (C) 2017-2018 SUSE
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*/
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#include <linux/statfs.h>
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#include "super.h"
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#include "mds_client.h"
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void ceph_adjust_quota_realms_count(struct inode *inode, bool inc)
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{
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struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
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if (inc)
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atomic64_inc(&mdsc->quotarealms_count);
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else
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atomic64_dec(&mdsc->quotarealms_count);
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}
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static inline bool ceph_has_realms_with_quotas(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(sb);
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struct inode *root = d_inode(sb->s_root);
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if (atomic64_read(&mdsc->quotarealms_count) > 0)
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return true;
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/* if root is the real CephFS root, we don't have quota realms */
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if (root && ceph_ino(root) == CEPH_INO_ROOT)
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return false;
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/* MDS stray dirs have no quota realms */
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if (ceph_vino_is_reserved(ceph_inode(inode)->i_vino))
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return false;
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/* otherwise, we can't know for sure */
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return true;
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}
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void ceph_handle_quota(struct ceph_mds_client *mdsc,
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struct ceph_mds_session *session,
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struct ceph_msg *msg)
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{
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struct super_block *sb = mdsc->fsc->sb;
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struct ceph_mds_quota *h = msg->front.iov_base;
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struct ceph_vino vino;
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struct inode *inode;
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struct ceph_inode_info *ci;
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if (msg->front.iov_len < sizeof(*h)) {
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pr_err("%s corrupt message mds%d len %d\n", __func__,
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session->s_mds, (int)msg->front.iov_len);
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ceph_msg_dump(msg);
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return;
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}
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/* increment msg sequence number */
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mutex_lock(&session->s_mutex);
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inc_session_sequence(session);
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mutex_unlock(&session->s_mutex);
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/* lookup inode */
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vino.ino = le64_to_cpu(h->ino);
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vino.snap = CEPH_NOSNAP;
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inode = ceph_find_inode(sb, vino);
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if (!inode) {
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pr_warn("Failed to find inode %llu\n", vino.ino);
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return;
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}
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ci = ceph_inode(inode);
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spin_lock(&ci->i_ceph_lock);
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ci->i_rbytes = le64_to_cpu(h->rbytes);
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ci->i_rfiles = le64_to_cpu(h->rfiles);
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ci->i_rsubdirs = le64_to_cpu(h->rsubdirs);
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__ceph_update_quota(ci, le64_to_cpu(h->max_bytes),
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le64_to_cpu(h->max_files));
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spin_unlock(&ci->i_ceph_lock);
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iput(inode);
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}
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static struct ceph_quotarealm_inode *
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find_quotarealm_inode(struct ceph_mds_client *mdsc, u64 ino)
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{
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struct ceph_quotarealm_inode *qri = NULL;
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struct rb_node **node, *parent = NULL;
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mutex_lock(&mdsc->quotarealms_inodes_mutex);
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node = &(mdsc->quotarealms_inodes.rb_node);
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while (*node) {
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parent = *node;
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qri = container_of(*node, struct ceph_quotarealm_inode, node);
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if (ino < qri->ino)
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node = &((*node)->rb_left);
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else if (ino > qri->ino)
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node = &((*node)->rb_right);
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else
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break;
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}
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if (!qri || (qri->ino != ino)) {
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/* Not found, create a new one and insert it */
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qri = kmalloc(sizeof(*qri), GFP_KERNEL);
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if (qri) {
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qri->ino = ino;
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qri->inode = NULL;
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qri->timeout = 0;
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mutex_init(&qri->mutex);
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rb_link_node(&qri->node, parent, node);
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rb_insert_color(&qri->node, &mdsc->quotarealms_inodes);
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} else
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pr_warn("Failed to alloc quotarealms_inode\n");
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}
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mutex_unlock(&mdsc->quotarealms_inodes_mutex);
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return qri;
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}
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/*
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* This function will try to lookup a realm inode which isn't visible in the
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* filesystem mountpoint. A list of these kind of inodes (not visible) is
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* maintained in the mdsc and freed only when the filesystem is umounted.
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*
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* Note that these inodes are kept in this list even if the lookup fails, which
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* allows to prevent useless lookup requests.
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*/
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static struct inode *lookup_quotarealm_inode(struct ceph_mds_client *mdsc,
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struct super_block *sb,
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struct ceph_snap_realm *realm)
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{
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struct ceph_quotarealm_inode *qri;
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struct inode *in;
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qri = find_quotarealm_inode(mdsc, realm->ino);
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if (!qri)
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return NULL;
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mutex_lock(&qri->mutex);
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if (qri->inode && ceph_is_any_caps(qri->inode)) {
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/* A request has already returned the inode */
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mutex_unlock(&qri->mutex);
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return qri->inode;
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}
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/* Check if this inode lookup has failed recently */
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if (qri->timeout &&
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time_before_eq(jiffies, qri->timeout)) {
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mutex_unlock(&qri->mutex);
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return NULL;
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}
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if (qri->inode) {
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/* get caps */
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int ret = __ceph_do_getattr(qri->inode, NULL,
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CEPH_STAT_CAP_INODE, true);
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if (ret >= 0)
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in = qri->inode;
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else
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in = ERR_PTR(ret);
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} else {
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in = ceph_lookup_inode(sb, realm->ino);
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}
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if (IS_ERR(in)) {
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dout("Can't lookup inode %llx (err: %ld)\n",
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realm->ino, PTR_ERR(in));
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qri->timeout = jiffies + msecs_to_jiffies(60 * 1000); /* XXX */
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} else {
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qri->timeout = 0;
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qri->inode = in;
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}
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mutex_unlock(&qri->mutex);
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return in;
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}
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void ceph_cleanup_quotarealms_inodes(struct ceph_mds_client *mdsc)
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{
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struct ceph_quotarealm_inode *qri;
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struct rb_node *node;
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/*
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* It should now be safe to clean quotarealms_inode tree without holding
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* mdsc->quotarealms_inodes_mutex...
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*/
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mutex_lock(&mdsc->quotarealms_inodes_mutex);
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while (!RB_EMPTY_ROOT(&mdsc->quotarealms_inodes)) {
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node = rb_first(&mdsc->quotarealms_inodes);
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qri = rb_entry(node, struct ceph_quotarealm_inode, node);
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rb_erase(node, &mdsc->quotarealms_inodes);
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iput(qri->inode);
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kfree(qri);
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}
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mutex_unlock(&mdsc->quotarealms_inodes_mutex);
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}
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/*
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* This function walks through the snaprealm for an inode and returns the
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* ceph_snap_realm for the first snaprealm that has quotas set (max_files,
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* max_bytes, or any, depending on the 'which_quota' argument). If the root is
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* reached, return the root ceph_snap_realm instead.
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*
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* Note that the caller is responsible for calling ceph_put_snap_realm() on the
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* returned realm.
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*
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* Callers of this function need to hold mdsc->snap_rwsem. However, if there's
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* a need to do an inode lookup, this rwsem will be temporarily dropped. Hence
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* the 'retry' argument: if rwsem needs to be dropped and 'retry' is 'false'
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* this function will return -EAGAIN; otherwise, the snaprealms walk-through
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* will be restarted.
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*/
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static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
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struct inode *inode,
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enum quota_get_realm which_quota,
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bool retry)
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{
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struct ceph_inode_info *ci = NULL;
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struct ceph_snap_realm *realm, *next;
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struct inode *in;
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bool has_quota;
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if (ceph_snap(inode) != CEPH_NOSNAP)
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return NULL;
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restart:
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realm = ceph_inode(inode)->i_snap_realm;
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if (realm)
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ceph_get_snap_realm(mdsc, realm);
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else
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pr_err_ratelimited("get_quota_realm: ino (%llx.%llx) "
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"null i_snap_realm\n", ceph_vinop(inode));
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while (realm) {
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bool has_inode;
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spin_lock(&realm->inodes_with_caps_lock);
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has_inode = realm->inode;
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in = has_inode ? igrab(realm->inode) : NULL;
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spin_unlock(&realm->inodes_with_caps_lock);
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if (has_inode && !in)
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break;
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if (!in) {
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up_read(&mdsc->snap_rwsem);
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in = lookup_quotarealm_inode(mdsc, inode->i_sb, realm);
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down_read(&mdsc->snap_rwsem);
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if (IS_ERR_OR_NULL(in))
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break;
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ceph_put_snap_realm(mdsc, realm);
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if (!retry)
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return ERR_PTR(-EAGAIN);
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goto restart;
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}
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ci = ceph_inode(in);
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has_quota = __ceph_has_quota(ci, which_quota);
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iput(in);
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next = realm->parent;
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if (has_quota || !next)
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return realm;
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ceph_get_snap_realm(mdsc, next);
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ceph_put_snap_realm(mdsc, realm);
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realm = next;
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}
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if (realm)
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ceph_put_snap_realm(mdsc, realm);
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return NULL;
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}
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bool ceph_quota_is_same_realm(struct inode *old, struct inode *new)
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{
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struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(old->i_sb);
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struct ceph_snap_realm *old_realm, *new_realm;
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bool is_same;
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restart:
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/*
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* We need to lookup 2 quota realms atomically, i.e. with snap_rwsem.
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* However, get_quota_realm may drop it temporarily. By setting the
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* 'retry' parameter to 'false', we'll get -EAGAIN if the rwsem was
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* dropped and we can then restart the whole operation.
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*/
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down_read(&mdsc->snap_rwsem);
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old_realm = get_quota_realm(mdsc, old, QUOTA_GET_ANY, true);
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new_realm = get_quota_realm(mdsc, new, QUOTA_GET_ANY, false);
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if (PTR_ERR(new_realm) == -EAGAIN) {
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up_read(&mdsc->snap_rwsem);
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if (old_realm)
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ceph_put_snap_realm(mdsc, old_realm);
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goto restart;
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}
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is_same = (old_realm == new_realm);
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up_read(&mdsc->snap_rwsem);
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if (old_realm)
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ceph_put_snap_realm(mdsc, old_realm);
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if (new_realm)
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ceph_put_snap_realm(mdsc, new_realm);
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return is_same;
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}
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enum quota_check_op {
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QUOTA_CHECK_MAX_FILES_OP, /* check quota max_files limit */
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QUOTA_CHECK_MAX_BYTES_OP, /* check quota max_files limit */
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QUOTA_CHECK_MAX_BYTES_APPROACHING_OP /* check if quota max_files
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limit is approaching */
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};
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/*
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* check_quota_exceeded() will walk up the snaprealm hierarchy and, for each
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* realm, it will execute quota check operation defined by the 'op' parameter.
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* The snaprealm walk is interrupted if the quota check detects that the quota
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* is exceeded or if the root inode is reached.
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*/
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static bool check_quota_exceeded(struct inode *inode, enum quota_check_op op,
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loff_t delta)
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{
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struct ceph_mds_client *mdsc = ceph_sb_to_mdsc(inode->i_sb);
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struct ceph_inode_info *ci;
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struct ceph_snap_realm *realm, *next;
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struct inode *in;
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u64 max, rvalue;
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bool exceeded = false;
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if (ceph_snap(inode) != CEPH_NOSNAP)
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return false;
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down_read(&mdsc->snap_rwsem);
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restart:
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realm = ceph_inode(inode)->i_snap_realm;
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if (realm)
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ceph_get_snap_realm(mdsc, realm);
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else
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pr_err_ratelimited("check_quota_exceeded: ino (%llx.%llx) "
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"null i_snap_realm\n", ceph_vinop(inode));
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while (realm) {
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bool has_inode;
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spin_lock(&realm->inodes_with_caps_lock);
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has_inode = realm->inode;
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in = has_inode ? igrab(realm->inode) : NULL;
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spin_unlock(&realm->inodes_with_caps_lock);
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if (has_inode && !in)
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break;
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if (!in) {
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up_read(&mdsc->snap_rwsem);
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in = lookup_quotarealm_inode(mdsc, inode->i_sb, realm);
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down_read(&mdsc->snap_rwsem);
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if (IS_ERR_OR_NULL(in))
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break;
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ceph_put_snap_realm(mdsc, realm);
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goto restart;
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}
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ci = ceph_inode(in);
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spin_lock(&ci->i_ceph_lock);
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if (op == QUOTA_CHECK_MAX_FILES_OP) {
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max = ci->i_max_files;
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rvalue = ci->i_rfiles + ci->i_rsubdirs;
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} else {
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max = ci->i_max_bytes;
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rvalue = ci->i_rbytes;
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}
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spin_unlock(&ci->i_ceph_lock);
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switch (op) {
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case QUOTA_CHECK_MAX_FILES_OP:
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case QUOTA_CHECK_MAX_BYTES_OP:
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exceeded = (max && (rvalue + delta > max));
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break;
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case QUOTA_CHECK_MAX_BYTES_APPROACHING_OP:
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if (max) {
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if (rvalue >= max)
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exceeded = true;
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else {
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/*
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* when we're writing more that 1/16th
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* of the available space
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*/
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exceeded =
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(((max - rvalue) >> 4) < delta);
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}
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}
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break;
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default:
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/* Shouldn't happen */
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pr_warn("Invalid quota check op (%d)\n", op);
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exceeded = true; /* Just break the loop */
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}
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iput(in);
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next = realm->parent;
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if (exceeded || !next)
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break;
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ceph_get_snap_realm(mdsc, next);
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ceph_put_snap_realm(mdsc, realm);
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realm = next;
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}
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if (realm)
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ceph_put_snap_realm(mdsc, realm);
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up_read(&mdsc->snap_rwsem);
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return exceeded;
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}
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/*
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* ceph_quota_is_max_files_exceeded - check if we can create a new file
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* @inode: directory where a new file is being created
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*
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* This functions returns true is max_files quota allows a new file to be
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* created. It is necessary to walk through the snaprealm hierarchy (until the
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* FS root) to check all realms with quotas set.
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*/
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bool ceph_quota_is_max_files_exceeded(struct inode *inode)
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{
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if (!ceph_has_realms_with_quotas(inode))
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return false;
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WARN_ON(!S_ISDIR(inode->i_mode));
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return check_quota_exceeded(inode, QUOTA_CHECK_MAX_FILES_OP, 1);
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}
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/*
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* ceph_quota_is_max_bytes_exceeded - check if we can write to a file
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* @inode: inode being written
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* @newsize: new size if write succeeds
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*
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* This functions returns true is max_bytes quota allows a file size to reach
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* @newsize; it returns false otherwise.
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*/
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bool ceph_quota_is_max_bytes_exceeded(struct inode *inode, loff_t newsize)
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{
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loff_t size = i_size_read(inode);
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if (!ceph_has_realms_with_quotas(inode))
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return false;
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/* return immediately if we're decreasing file size */
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if (newsize <= size)
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return false;
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return check_quota_exceeded(inode, QUOTA_CHECK_MAX_BYTES_OP, (newsize - size));
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}
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/*
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* ceph_quota_is_max_bytes_approaching - check if we're reaching max_bytes
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* @inode: inode being written
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* @newsize: new size if write succeeds
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*
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* This function returns true if the new file size @newsize will be consuming
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* more than 1/16th of the available quota space; it returns false otherwise.
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*/
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bool ceph_quota_is_max_bytes_approaching(struct inode *inode, loff_t newsize)
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{
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loff_t size = ceph_inode(inode)->i_reported_size;
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if (!ceph_has_realms_with_quotas(inode))
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return false;
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/* return immediately if we're decreasing file size */
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if (newsize <= size)
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return false;
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return check_quota_exceeded(inode, QUOTA_CHECK_MAX_BYTES_APPROACHING_OP,
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(newsize - size));
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}
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/*
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* ceph_quota_update_statfs - if root has quota update statfs with quota status
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* @fsc: filesystem client instance
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* @buf: statfs to update
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*
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* If the mounted filesystem root has max_bytes quota set, update the filesystem
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* statistics with the quota status.
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*
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* This function returns true if the stats have been updated, false otherwise.
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*/
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bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, struct kstatfs *buf)
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{
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struct ceph_mds_client *mdsc = fsc->mdsc;
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struct ceph_inode_info *ci;
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struct ceph_snap_realm *realm;
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struct inode *in;
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u64 total = 0, used, free;
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bool is_updated = false;
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down_read(&mdsc->snap_rwsem);
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realm = get_quota_realm(mdsc, d_inode(fsc->sb->s_root),
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QUOTA_GET_MAX_BYTES, true);
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up_read(&mdsc->snap_rwsem);
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if (!realm)
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return false;
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spin_lock(&realm->inodes_with_caps_lock);
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in = realm->inode ? igrab(realm->inode) : NULL;
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spin_unlock(&realm->inodes_with_caps_lock);
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if (in) {
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ci = ceph_inode(in);
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spin_lock(&ci->i_ceph_lock);
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if (ci->i_max_bytes) {
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total = ci->i_max_bytes >> CEPH_BLOCK_SHIFT;
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used = ci->i_rbytes >> CEPH_BLOCK_SHIFT;
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/* For quota size less than 4MB, use 4KB block size */
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if (!total) {
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total = ci->i_max_bytes >> CEPH_4K_BLOCK_SHIFT;
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used = ci->i_rbytes >> CEPH_4K_BLOCK_SHIFT;
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buf->f_frsize = 1 << CEPH_4K_BLOCK_SHIFT;
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}
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/* It is possible for a quota to be exceeded.
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* Report 'zero' in that case
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*/
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free = total > used ? total - used : 0;
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/* For quota size less than 4KB, report the
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* total=used=4KB,free=0 when quota is full
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* and total=free=4KB, used=0 otherwise */
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if (!total) {
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total = 1;
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free = ci->i_max_bytes > ci->i_rbytes ? 1 : 0;
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buf->f_frsize = 1 << CEPH_4K_BLOCK_SHIFT;
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}
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}
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spin_unlock(&ci->i_ceph_lock);
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if (total) {
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buf->f_blocks = total;
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buf->f_bfree = free;
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buf->f_bavail = free;
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is_updated = true;
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}
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iput(in);
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}
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ceph_put_snap_realm(mdsc, realm);
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return is_updated;
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}
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