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0fcf6c02b2
Later version mds may encode more data into messages. Signed-off-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
362 lines
9.7 KiB
C
362 lines
9.7 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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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_inode_to_client(inode)->mdsc;
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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 ceph_mds_client *mdsc = ceph_inode_to_client(inode)->mdsc;
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return atomic64_read(&mdsc->quotarealms_count) > 0;
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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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session->s_seq++;
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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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/*
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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 (either max_files
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* or max_bytes). If the root is reached, return the root ceph_snap_realm
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* 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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static struct ceph_snap_realm *get_quota_realm(struct ceph_mds_client *mdsc,
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struct inode *inode)
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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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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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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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break;
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ci = ceph_inode(in);
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has_quota = __ceph_has_any_quota(ci);
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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_inode_to_client(old)->mdsc;
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struct ceph_snap_realm *old_realm, *new_realm;
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bool is_same;
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down_read(&mdsc->snap_rwsem);
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old_realm = get_quota_realm(mdsc, old);
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new_realm = get_quota_realm(mdsc, new);
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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_inode_to_client(inode)->mdsc;
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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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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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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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break;
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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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exceeded = (max && (rvalue >= max));
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break;
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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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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, 0);
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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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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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/* 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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}
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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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