![Thomas Gleixner](/assets/img/avatar_default.png)
Precise and non-ambiguous license information is important. The recently
added quota.c file has a SPDX license identifier, which is nice, but
at the same time it has a contradictionary license boiler plate text.
SPDX-License-Identifier: GPL-2.0
versus
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
Oh well.
As the other ceph related files are licensed under the GPL v2 only, it's
assumed that the SPDX id is correct and the boiler plate was randomly
copied into that patch.
Remove the boiler plate as it is wrong and even if correct it is redundant.
Fixes: fb18a57568
("ceph: quota: add initial infrastructure to support cephfs quotas")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Luis Henriques <lhenriques@suse.com>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: "Yan, Zheng" <zyan@redhat.com>
Cc: Sage Weil <sage@redhat.com>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: ceph-devel@vger.kernel.org
Acked-by: Luis Henriques <lhenriques@suse.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
350 lines
9.1 KiB
C
350 lines
9.1 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_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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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, 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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