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![Filipe Manana](/assets/img/avatar_default.png)
[ Upstream commit8a4a0b2a3e
] If we disable quotas while we have a relocation of a metadata block group that has extents belonging to the quota root, we can cause the relocation to fail with -ENOENT. This is because relocation builds backref nodes for extents of the quota root and later needs to walk the backrefs and access the quota root - however if in between a task disables quotas, it results in deleting the quota root from the root tree (with btrfs_del_root(), called from btrfs_quota_disable(). This can be sporadically triggered by test case btrfs/255 from fstests: $ ./check btrfs/255 FSTYP -- btrfs PLATFORM -- Linux/x86_64 debian0 6.4.0-rc6-btrfs-next-134+ #1 SMP PREEMPT_DYNAMIC Thu Jun 15 11:59:28 WEST 2023 MKFS_OPTIONS -- /dev/sdc MOUNT_OPTIONS -- /dev/sdc /home/fdmanana/btrfs-tests/scratch_1 btrfs/255 6s ... _check_dmesg: something found in dmesg (see /home/fdmanana/git/hub/xfstests/results//btrfs/255.dmesg) - output mismatch (see /home/fdmanana/git/hub/xfstests/results//btrfs/255.out.bad) # --- tests/btrfs/255.out 2023-03-02 21:47:53.876609426 +0000 # +++ /home/fdmanana/git/hub/xfstests/results//btrfs/255.out.bad 2023-06-16 10:20:39.267563212 +0100 # @@ -1,2 +1,4 @@ # QA output created by 255 # +ERROR: error during balancing '/home/fdmanana/btrfs-tests/scratch_1': No such file or directory # +There may be more info in syslog - try dmesg | tail # Silence is golden # ... (Run 'diff -u /home/fdmanana/git/hub/xfstests/tests/btrfs/255.out /home/fdmanana/git/hub/xfstests/results//btrfs/255.out.bad' to see the entire diff) Ran: btrfs/255 Failures: btrfs/255 Failed 1 of 1 tests To fix this make the quota disable operation take the cleaner mutex, as relocation of a block group also takes this mutex. This is also what we do when deleting a subvolume/snapshot, we take the cleaner mutex in the cleaner kthread (at cleaner_kthread()) and then we call btrfs_del_root() at btrfs_drop_snapshot() while under the protection of the cleaner mutex. Fixes:bed92eae26
("Btrfs: qgroup implementation and prototypes") CC: stable@vger.kernel.org # 5.4+ Signed-off-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: David Sterba <dsterba@suse.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
4449 lines
116 KiB
C
4449 lines
116 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (C) 2011 STRATO. All rights reserved.
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*/
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#include <linux/sched.h>
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#include <linux/pagemap.h>
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#include <linux/writeback.h>
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#include <linux/blkdev.h>
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#include <linux/rbtree.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/btrfs.h>
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#include <linux/sched/mm.h>
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#include "ctree.h"
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#include "transaction.h"
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#include "disk-io.h"
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#include "locking.h"
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#include "ulist.h"
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#include "backref.h"
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#include "extent_io.h"
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#include "qgroup.h"
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#include "block-group.h"
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#include "sysfs.h"
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#include "tree-mod-log.h"
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#include "fs.h"
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#include "accessors.h"
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#include "extent-tree.h"
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#include "root-tree.h"
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#include "tree-checker.h"
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/*
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* Helpers to access qgroup reservation
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*
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* Callers should ensure the lock context and type are valid
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*/
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static u64 qgroup_rsv_total(const struct btrfs_qgroup *qgroup)
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{
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u64 ret = 0;
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int i;
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for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
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ret += qgroup->rsv.values[i];
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return ret;
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}
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#ifdef CONFIG_BTRFS_DEBUG
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static const char *qgroup_rsv_type_str(enum btrfs_qgroup_rsv_type type)
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{
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if (type == BTRFS_QGROUP_RSV_DATA)
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return "data";
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if (type == BTRFS_QGROUP_RSV_META_PERTRANS)
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return "meta_pertrans";
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if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
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return "meta_prealloc";
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return NULL;
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}
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#endif
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static void qgroup_rsv_add(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup *qgroup, u64 num_bytes,
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enum btrfs_qgroup_rsv_type type)
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{
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trace_qgroup_update_reserve(fs_info, qgroup, num_bytes, type);
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qgroup->rsv.values[type] += num_bytes;
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}
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static void qgroup_rsv_release(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup *qgroup, u64 num_bytes,
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enum btrfs_qgroup_rsv_type type)
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{
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trace_qgroup_update_reserve(fs_info, qgroup, -(s64)num_bytes, type);
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if (qgroup->rsv.values[type] >= num_bytes) {
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qgroup->rsv.values[type] -= num_bytes;
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return;
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}
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#ifdef CONFIG_BTRFS_DEBUG
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WARN_RATELIMIT(1,
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"qgroup %llu %s reserved space underflow, have %llu to free %llu",
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qgroup->qgroupid, qgroup_rsv_type_str(type),
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qgroup->rsv.values[type], num_bytes);
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#endif
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qgroup->rsv.values[type] = 0;
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}
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static void qgroup_rsv_add_by_qgroup(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup *dest,
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struct btrfs_qgroup *src)
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{
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int i;
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for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
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qgroup_rsv_add(fs_info, dest, src->rsv.values[i], i);
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}
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static void qgroup_rsv_release_by_qgroup(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup *dest,
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struct btrfs_qgroup *src)
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{
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int i;
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for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++)
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qgroup_rsv_release(fs_info, dest, src->rsv.values[i], i);
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}
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static void btrfs_qgroup_update_old_refcnt(struct btrfs_qgroup *qg, u64 seq,
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int mod)
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{
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if (qg->old_refcnt < seq)
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qg->old_refcnt = seq;
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qg->old_refcnt += mod;
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}
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static void btrfs_qgroup_update_new_refcnt(struct btrfs_qgroup *qg, u64 seq,
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int mod)
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{
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if (qg->new_refcnt < seq)
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qg->new_refcnt = seq;
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qg->new_refcnt += mod;
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}
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static inline u64 btrfs_qgroup_get_old_refcnt(struct btrfs_qgroup *qg, u64 seq)
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{
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if (qg->old_refcnt < seq)
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return 0;
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return qg->old_refcnt - seq;
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}
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static inline u64 btrfs_qgroup_get_new_refcnt(struct btrfs_qgroup *qg, u64 seq)
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{
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if (qg->new_refcnt < seq)
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return 0;
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return qg->new_refcnt - seq;
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}
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/*
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* glue structure to represent the relations between qgroups.
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*/
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struct btrfs_qgroup_list {
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struct list_head next_group;
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struct list_head next_member;
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struct btrfs_qgroup *group;
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struct btrfs_qgroup *member;
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};
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static inline u64 qgroup_to_aux(struct btrfs_qgroup *qg)
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{
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return (u64)(uintptr_t)qg;
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}
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static inline struct btrfs_qgroup* unode_aux_to_qgroup(struct ulist_node *n)
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{
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return (struct btrfs_qgroup *)(uintptr_t)n->aux;
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}
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static int
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qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
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int init_flags);
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static void qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info);
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/* must be called with qgroup_ioctl_lock held */
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static struct btrfs_qgroup *find_qgroup_rb(struct btrfs_fs_info *fs_info,
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u64 qgroupid)
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{
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struct rb_node *n = fs_info->qgroup_tree.rb_node;
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struct btrfs_qgroup *qgroup;
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while (n) {
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qgroup = rb_entry(n, struct btrfs_qgroup, node);
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if (qgroup->qgroupid < qgroupid)
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n = n->rb_left;
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else if (qgroup->qgroupid > qgroupid)
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n = n->rb_right;
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else
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return qgroup;
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}
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return NULL;
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}
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/* must be called with qgroup_lock held */
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static struct btrfs_qgroup *add_qgroup_rb(struct btrfs_fs_info *fs_info,
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u64 qgroupid)
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{
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struct rb_node **p = &fs_info->qgroup_tree.rb_node;
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struct rb_node *parent = NULL;
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struct btrfs_qgroup *qgroup;
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while (*p) {
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parent = *p;
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qgroup = rb_entry(parent, struct btrfs_qgroup, node);
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if (qgroup->qgroupid < qgroupid)
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p = &(*p)->rb_left;
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else if (qgroup->qgroupid > qgroupid)
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p = &(*p)->rb_right;
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else
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return qgroup;
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}
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qgroup = kzalloc(sizeof(*qgroup), GFP_ATOMIC);
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if (!qgroup)
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return ERR_PTR(-ENOMEM);
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qgroup->qgroupid = qgroupid;
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INIT_LIST_HEAD(&qgroup->groups);
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INIT_LIST_HEAD(&qgroup->members);
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INIT_LIST_HEAD(&qgroup->dirty);
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rb_link_node(&qgroup->node, parent, p);
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rb_insert_color(&qgroup->node, &fs_info->qgroup_tree);
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return qgroup;
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}
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static void __del_qgroup_rb(struct btrfs_fs_info *fs_info,
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struct btrfs_qgroup *qgroup)
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{
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struct btrfs_qgroup_list *list;
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list_del(&qgroup->dirty);
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while (!list_empty(&qgroup->groups)) {
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list = list_first_entry(&qgroup->groups,
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struct btrfs_qgroup_list, next_group);
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
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}
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while (!list_empty(&qgroup->members)) {
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list = list_first_entry(&qgroup->members,
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struct btrfs_qgroup_list, next_member);
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
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}
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}
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/* must be called with qgroup_lock held */
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static int del_qgroup_rb(struct btrfs_fs_info *fs_info, u64 qgroupid)
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{
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struct btrfs_qgroup *qgroup = find_qgroup_rb(fs_info, qgroupid);
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if (!qgroup)
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return -ENOENT;
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rb_erase(&qgroup->node, &fs_info->qgroup_tree);
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__del_qgroup_rb(fs_info, qgroup);
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return 0;
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}
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/*
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* Add relation specified by two qgroups.
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*
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* Must be called with qgroup_lock held.
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*
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* Return: 0 on success
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* -ENOENT if one of the qgroups is NULL
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* <0 other errors
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*/
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static int __add_relation_rb(struct btrfs_qgroup *member, struct btrfs_qgroup *parent)
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{
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struct btrfs_qgroup_list *list;
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if (!member || !parent)
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return -ENOENT;
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list = kzalloc(sizeof(*list), GFP_ATOMIC);
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if (!list)
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return -ENOMEM;
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list->group = parent;
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list->member = member;
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list_add_tail(&list->next_group, &member->groups);
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list_add_tail(&list->next_member, &parent->members);
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return 0;
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}
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/*
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* Add relation specified by two qgroup ids.
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*
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* Must be called with qgroup_lock held.
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*
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* Return: 0 on success
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* -ENOENT if one of the ids does not exist
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* <0 other errors
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*/
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static int add_relation_rb(struct btrfs_fs_info *fs_info, u64 memberid, u64 parentid)
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{
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struct btrfs_qgroup *member;
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struct btrfs_qgroup *parent;
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member = find_qgroup_rb(fs_info, memberid);
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parent = find_qgroup_rb(fs_info, parentid);
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return __add_relation_rb(member, parent);
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}
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/* Must be called with qgroup_lock held */
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static int del_relation_rb(struct btrfs_fs_info *fs_info,
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u64 memberid, u64 parentid)
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{
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struct btrfs_qgroup *member;
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struct btrfs_qgroup *parent;
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struct btrfs_qgroup_list *list;
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member = find_qgroup_rb(fs_info, memberid);
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parent = find_qgroup_rb(fs_info, parentid);
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if (!member || !parent)
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return -ENOENT;
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list_for_each_entry(list, &member->groups, next_group) {
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if (list->group == parent) {
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list_del(&list->next_group);
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list_del(&list->next_member);
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kfree(list);
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return 0;
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}
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}
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return -ENOENT;
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}
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#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS
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int btrfs_verify_qgroup_counts(struct btrfs_fs_info *fs_info, u64 qgroupid,
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u64 rfer, u64 excl)
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{
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struct btrfs_qgroup *qgroup;
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qgroup = find_qgroup_rb(fs_info, qgroupid);
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if (!qgroup)
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return -EINVAL;
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if (qgroup->rfer != rfer || qgroup->excl != excl)
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return -EINVAL;
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return 0;
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}
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#endif
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static void qgroup_mark_inconsistent(struct btrfs_fs_info *fs_info)
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{
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fs_info->qgroup_flags |= (BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT |
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BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN |
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BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING);
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}
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/*
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* The full config is read in one go, only called from open_ctree()
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* It doesn't use any locking, as at this point we're still single-threaded
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*/
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int btrfs_read_qgroup_config(struct btrfs_fs_info *fs_info)
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{
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struct btrfs_key key;
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struct btrfs_key found_key;
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struct btrfs_root *quota_root = fs_info->quota_root;
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struct btrfs_path *path = NULL;
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struct extent_buffer *l;
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int slot;
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int ret = 0;
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u64 flags = 0;
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u64 rescan_progress = 0;
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if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
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return 0;
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fs_info->qgroup_ulist = ulist_alloc(GFP_KERNEL);
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if (!fs_info->qgroup_ulist) {
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ret = -ENOMEM;
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goto out;
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}
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path = btrfs_alloc_path();
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if (!path) {
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ret = -ENOMEM;
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goto out;
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}
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ret = btrfs_sysfs_add_qgroups(fs_info);
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if (ret < 0)
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goto out;
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/* default this to quota off, in case no status key is found */
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fs_info->qgroup_flags = 0;
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/*
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* pass 1: read status, all qgroup infos and limits
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*/
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key.objectid = 0;
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key.type = 0;
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key.offset = 0;
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ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 1);
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if (ret)
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goto out;
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while (1) {
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struct btrfs_qgroup *qgroup;
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slot = path->slots[0];
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l = path->nodes[0];
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btrfs_item_key_to_cpu(l, &found_key, slot);
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if (found_key.type == BTRFS_QGROUP_STATUS_KEY) {
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struct btrfs_qgroup_status_item *ptr;
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ptr = btrfs_item_ptr(l, slot,
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struct btrfs_qgroup_status_item);
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if (btrfs_qgroup_status_version(l, ptr) !=
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BTRFS_QGROUP_STATUS_VERSION) {
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btrfs_err(fs_info,
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"old qgroup version, quota disabled");
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goto out;
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}
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if (btrfs_qgroup_status_generation(l, ptr) !=
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fs_info->generation) {
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qgroup_mark_inconsistent(fs_info);
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btrfs_err(fs_info,
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"qgroup generation mismatch, marked as inconsistent");
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}
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fs_info->qgroup_flags = btrfs_qgroup_status_flags(l,
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ptr);
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rescan_progress = btrfs_qgroup_status_rescan(l, ptr);
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goto next1;
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}
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|
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if (found_key.type != BTRFS_QGROUP_INFO_KEY &&
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found_key.type != BTRFS_QGROUP_LIMIT_KEY)
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goto next1;
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qgroup = find_qgroup_rb(fs_info, found_key.offset);
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if ((qgroup && found_key.type == BTRFS_QGROUP_INFO_KEY) ||
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(!qgroup && found_key.type == BTRFS_QGROUP_LIMIT_KEY)) {
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btrfs_err(fs_info, "inconsistent qgroup config");
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qgroup_mark_inconsistent(fs_info);
|
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}
|
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if (!qgroup) {
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qgroup = add_qgroup_rb(fs_info, found_key.offset);
|
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if (IS_ERR(qgroup)) {
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ret = PTR_ERR(qgroup);
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goto out;
|
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}
|
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}
|
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ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
|
|
if (ret < 0)
|
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goto out;
|
|
|
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switch (found_key.type) {
|
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case BTRFS_QGROUP_INFO_KEY: {
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struct btrfs_qgroup_info_item *ptr;
|
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|
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ptr = btrfs_item_ptr(l, slot,
|
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struct btrfs_qgroup_info_item);
|
|
qgroup->rfer = btrfs_qgroup_info_rfer(l, ptr);
|
|
qgroup->rfer_cmpr = btrfs_qgroup_info_rfer_cmpr(l, ptr);
|
|
qgroup->excl = btrfs_qgroup_info_excl(l, ptr);
|
|
qgroup->excl_cmpr = btrfs_qgroup_info_excl_cmpr(l, ptr);
|
|
/* generation currently unused */
|
|
break;
|
|
}
|
|
case BTRFS_QGROUP_LIMIT_KEY: {
|
|
struct btrfs_qgroup_limit_item *ptr;
|
|
|
|
ptr = btrfs_item_ptr(l, slot,
|
|
struct btrfs_qgroup_limit_item);
|
|
qgroup->lim_flags = btrfs_qgroup_limit_flags(l, ptr);
|
|
qgroup->max_rfer = btrfs_qgroup_limit_max_rfer(l, ptr);
|
|
qgroup->max_excl = btrfs_qgroup_limit_max_excl(l, ptr);
|
|
qgroup->rsv_rfer = btrfs_qgroup_limit_rsv_rfer(l, ptr);
|
|
qgroup->rsv_excl = btrfs_qgroup_limit_rsv_excl(l, ptr);
|
|
break;
|
|
}
|
|
}
|
|
next1:
|
|
ret = btrfs_next_item(quota_root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
break;
|
|
}
|
|
btrfs_release_path(path);
|
|
|
|
/*
|
|
* pass 2: read all qgroup relations
|
|
*/
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_RELATION_KEY;
|
|
key.offset = 0;
|
|
ret = btrfs_search_slot_for_read(quota_root, &key, path, 1, 0);
|
|
if (ret)
|
|
goto out;
|
|
while (1) {
|
|
slot = path->slots[0];
|
|
l = path->nodes[0];
|
|
btrfs_item_key_to_cpu(l, &found_key, slot);
|
|
|
|
if (found_key.type != BTRFS_QGROUP_RELATION_KEY)
|
|
goto next2;
|
|
|
|
if (found_key.objectid > found_key.offset) {
|
|
/* parent <- member, not needed to build config */
|
|
/* FIXME should we omit the key completely? */
|
|
goto next2;
|
|
}
|
|
|
|
ret = add_relation_rb(fs_info, found_key.objectid,
|
|
found_key.offset);
|
|
if (ret == -ENOENT) {
|
|
btrfs_warn(fs_info,
|
|
"orphan qgroup relation 0x%llx->0x%llx",
|
|
found_key.objectid, found_key.offset);
|
|
ret = 0; /* ignore the error */
|
|
}
|
|
if (ret)
|
|
goto out;
|
|
next2:
|
|
ret = btrfs_next_item(quota_root, path);
|
|
if (ret < 0)
|
|
goto out;
|
|
if (ret)
|
|
break;
|
|
}
|
|
out:
|
|
btrfs_free_path(path);
|
|
fs_info->qgroup_flags |= flags;
|
|
if (!(fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_ON))
|
|
clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
|
|
else if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN &&
|
|
ret >= 0)
|
|
ret = qgroup_rescan_init(fs_info, rescan_progress, 0);
|
|
|
|
if (ret < 0) {
|
|
ulist_free(fs_info->qgroup_ulist);
|
|
fs_info->qgroup_ulist = NULL;
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
btrfs_sysfs_del_qgroups(fs_info);
|
|
}
|
|
|
|
return ret < 0 ? ret : 0;
|
|
}
|
|
|
|
/*
|
|
* Called in close_ctree() when quota is still enabled. This verifies we don't
|
|
* leak some reserved space.
|
|
*
|
|
* Return false if no reserved space is left.
|
|
* Return true if some reserved space is leaked.
|
|
*/
|
|
bool btrfs_check_quota_leak(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct rb_node *node;
|
|
bool ret = false;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
return ret;
|
|
/*
|
|
* Since we're unmounting, there is no race and no need to grab qgroup
|
|
* lock. And here we don't go post-order to provide a more user
|
|
* friendly sorted result.
|
|
*/
|
|
for (node = rb_first(&fs_info->qgroup_tree); node; node = rb_next(node)) {
|
|
struct btrfs_qgroup *qgroup;
|
|
int i;
|
|
|
|
qgroup = rb_entry(node, struct btrfs_qgroup, node);
|
|
for (i = 0; i < BTRFS_QGROUP_RSV_LAST; i++) {
|
|
if (qgroup->rsv.values[i]) {
|
|
ret = true;
|
|
btrfs_warn(fs_info,
|
|
"qgroup %hu/%llu has unreleased space, type %d rsv %llu",
|
|
btrfs_qgroup_level(qgroup->qgroupid),
|
|
btrfs_qgroup_subvolid(qgroup->qgroupid),
|
|
i, qgroup->rsv.values[i]);
|
|
}
|
|
}
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* This is called from close_ctree() or open_ctree() or btrfs_quota_disable(),
|
|
* first two are in single-threaded paths.And for the third one, we have set
|
|
* quota_root to be null with qgroup_lock held before, so it is safe to clean
|
|
* up the in-memory structures without qgroup_lock held.
|
|
*/
|
|
void btrfs_free_qgroup_config(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct rb_node *n;
|
|
struct btrfs_qgroup *qgroup;
|
|
|
|
while ((n = rb_first(&fs_info->qgroup_tree))) {
|
|
qgroup = rb_entry(n, struct btrfs_qgroup, node);
|
|
rb_erase(n, &fs_info->qgroup_tree);
|
|
__del_qgroup_rb(fs_info, qgroup);
|
|
btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
|
|
kfree(qgroup);
|
|
}
|
|
/*
|
|
* We call btrfs_free_qgroup_config() when unmounting
|
|
* filesystem and disabling quota, so we set qgroup_ulist
|
|
* to be null here to avoid double free.
|
|
*/
|
|
ulist_free(fs_info->qgroup_ulist);
|
|
fs_info->qgroup_ulist = NULL;
|
|
btrfs_sysfs_del_qgroups(fs_info);
|
|
}
|
|
|
|
static int add_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
|
|
u64 dst)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *quota_root = trans->fs_info->quota_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = src;
|
|
key.type = BTRFS_QGROUP_RELATION_KEY;
|
|
key.offset = dst;
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key, 0);
|
|
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int del_qgroup_relation_item(struct btrfs_trans_handle *trans, u64 src,
|
|
u64 dst)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *quota_root = trans->fs_info->quota_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = src;
|
|
key.type = BTRFS_QGROUP_RELATION_KEY;
|
|
key.offset = dst;
|
|
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, quota_root, path);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int add_qgroup_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *quota_root, u64 qgroupid)
|
|
{
|
|
int ret;
|
|
struct btrfs_path *path;
|
|
struct btrfs_qgroup_info_item *qgroup_info;
|
|
struct btrfs_qgroup_limit_item *qgroup_limit;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
|
|
if (btrfs_is_testing(quota_root->fs_info))
|
|
return 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroupid;
|
|
|
|
/*
|
|
* Avoid a transaction abort by catching -EEXIST here. In that
|
|
* case, we proceed by re-initializing the existing structure
|
|
* on disk.
|
|
*/
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*qgroup_info));
|
|
if (ret && ret != -EEXIST)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
qgroup_info = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_qgroup_info_item);
|
|
btrfs_set_qgroup_info_generation(leaf, qgroup_info, trans->transid);
|
|
btrfs_set_qgroup_info_rfer(leaf, qgroup_info, 0);
|
|
btrfs_set_qgroup_info_rfer_cmpr(leaf, qgroup_info, 0);
|
|
btrfs_set_qgroup_info_excl(leaf, qgroup_info, 0);
|
|
btrfs_set_qgroup_info_excl_cmpr(leaf, qgroup_info, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
btrfs_release_path(path);
|
|
|
|
key.type = BTRFS_QGROUP_LIMIT_KEY;
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*qgroup_limit));
|
|
if (ret && ret != -EEXIST)
|
|
goto out;
|
|
|
|
leaf = path->nodes[0];
|
|
qgroup_limit = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_qgroup_limit_item);
|
|
btrfs_set_qgroup_limit_flags(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_max_rfer(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_max_excl(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_rsv_rfer(leaf, qgroup_limit, 0);
|
|
btrfs_set_qgroup_limit_rsv_excl(leaf, qgroup_limit, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int del_qgroup_item(struct btrfs_trans_handle *trans, u64 qgroupid)
|
|
{
|
|
int ret;
|
|
struct btrfs_root *quota_root = trans->fs_info->quota_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroupid;
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, quota_root, path);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
|
|
key.type = BTRFS_QGROUP_LIMIT_KEY;
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_item(trans, quota_root, path);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int update_qgroup_limit_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
struct btrfs_root *quota_root = trans->fs_info->quota_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *l;
|
|
struct btrfs_qgroup_limit_item *qgroup_limit;
|
|
int ret;
|
|
int slot;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_LIMIT_KEY;
|
|
key.offset = qgroup->qgroupid;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
qgroup_limit = btrfs_item_ptr(l, slot, struct btrfs_qgroup_limit_item);
|
|
btrfs_set_qgroup_limit_flags(l, qgroup_limit, qgroup->lim_flags);
|
|
btrfs_set_qgroup_limit_max_rfer(l, qgroup_limit, qgroup->max_rfer);
|
|
btrfs_set_qgroup_limit_max_excl(l, qgroup_limit, qgroup->max_excl);
|
|
btrfs_set_qgroup_limit_rsv_rfer(l, qgroup_limit, qgroup->rsv_rfer);
|
|
btrfs_set_qgroup_limit_rsv_excl(l, qgroup_limit, qgroup->rsv_excl);
|
|
|
|
btrfs_mark_buffer_dirty(l);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int update_qgroup_info_item(struct btrfs_trans_handle *trans,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_root *quota_root = fs_info->quota_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *l;
|
|
struct btrfs_qgroup_info_item *qgroup_info;
|
|
int ret;
|
|
int slot;
|
|
|
|
if (btrfs_is_testing(fs_info))
|
|
return 0;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_INFO_KEY;
|
|
key.offset = qgroup->qgroupid;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
qgroup_info = btrfs_item_ptr(l, slot, struct btrfs_qgroup_info_item);
|
|
btrfs_set_qgroup_info_generation(l, qgroup_info, trans->transid);
|
|
btrfs_set_qgroup_info_rfer(l, qgroup_info, qgroup->rfer);
|
|
btrfs_set_qgroup_info_rfer_cmpr(l, qgroup_info, qgroup->rfer_cmpr);
|
|
btrfs_set_qgroup_info_excl(l, qgroup_info, qgroup->excl);
|
|
btrfs_set_qgroup_info_excl_cmpr(l, qgroup_info, qgroup->excl_cmpr);
|
|
|
|
btrfs_mark_buffer_dirty(l);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
static int update_qgroup_status_item(struct btrfs_trans_handle *trans)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_root *quota_root = fs_info->quota_root;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *l;
|
|
struct btrfs_qgroup_status_item *ptr;
|
|
int ret;
|
|
int slot;
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_STATUS_KEY;
|
|
key.offset = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
ret = btrfs_search_slot(trans, quota_root, &key, path, 0, 1);
|
|
if (ret > 0)
|
|
ret = -ENOENT;
|
|
|
|
if (ret)
|
|
goto out;
|
|
|
|
l = path->nodes[0];
|
|
slot = path->slots[0];
|
|
ptr = btrfs_item_ptr(l, slot, struct btrfs_qgroup_status_item);
|
|
btrfs_set_qgroup_status_flags(l, ptr, fs_info->qgroup_flags &
|
|
BTRFS_QGROUP_STATUS_FLAGS_MASK);
|
|
btrfs_set_qgroup_status_generation(l, ptr, trans->transid);
|
|
btrfs_set_qgroup_status_rescan(l, ptr,
|
|
fs_info->qgroup_rescan_progress.objectid);
|
|
|
|
btrfs_mark_buffer_dirty(l);
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* called with qgroup_lock held
|
|
*/
|
|
static int btrfs_clean_quota_tree(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root)
|
|
{
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
struct extent_buffer *leaf = NULL;
|
|
int ret;
|
|
int nr = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = 0;
|
|
key.offset = 0;
|
|
key.type = 0;
|
|
|
|
while (1) {
|
|
ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
|
|
if (ret < 0)
|
|
goto out;
|
|
leaf = path->nodes[0];
|
|
nr = btrfs_header_nritems(leaf);
|
|
if (!nr)
|
|
break;
|
|
/*
|
|
* delete the leaf one by one
|
|
* since the whole tree is going
|
|
* to be deleted.
|
|
*/
|
|
path->slots[0] = 0;
|
|
ret = btrfs_del_items(trans, root, path, 0, nr);
|
|
if (ret)
|
|
goto out;
|
|
|
|
btrfs_release_path(path);
|
|
}
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_quota_enable(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_path *path = NULL;
|
|
struct btrfs_qgroup_status_item *ptr;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
struct btrfs_key found_key;
|
|
struct btrfs_qgroup *qgroup = NULL;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
struct ulist *ulist = NULL;
|
|
int ret = 0;
|
|
int slot;
|
|
|
|
/*
|
|
* We need to have subvol_sem write locked, to prevent races between
|
|
* concurrent tasks trying to enable quotas, because we will unlock
|
|
* and relock qgroup_ioctl_lock before setting fs_info->quota_root
|
|
* and before setting BTRFS_FS_QUOTA_ENABLED.
|
|
*/
|
|
lockdep_assert_held_write(&fs_info->subvol_sem);
|
|
|
|
if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
|
|
btrfs_err(fs_info,
|
|
"qgroups are currently unsupported in extent tree v2");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (fs_info->quota_root)
|
|
goto out;
|
|
|
|
ulist = ulist_alloc(GFP_KERNEL);
|
|
if (!ulist) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_sysfs_add_qgroups(fs_info);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/*
|
|
* Unlock qgroup_ioctl_lock before starting the transaction. This is to
|
|
* avoid lock acquisition inversion problems (reported by lockdep) between
|
|
* qgroup_ioctl_lock and the vfs freeze semaphores, acquired when we
|
|
* start a transaction.
|
|
* After we started the transaction lock qgroup_ioctl_lock again and
|
|
* check if someone else created the quota root in the meanwhile. If so,
|
|
* just return success and release the transaction handle.
|
|
*
|
|
* Also we don't need to worry about someone else calling
|
|
* btrfs_sysfs_add_qgroups() after we unlock and getting an error because
|
|
* that function returns 0 (success) when the sysfs entries already exist.
|
|
*/
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
|
|
/*
|
|
* 1 for quota root item
|
|
* 1 for BTRFS_QGROUP_STATUS item
|
|
*
|
|
* Yet we also need 2*n items for a QGROUP_INFO/QGROUP_LIMIT items
|
|
* per subvolume. However those are not currently reserved since it
|
|
* would be a lot of overkill.
|
|
*/
|
|
trans = btrfs_start_transaction(tree_root, 2);
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
trans = NULL;
|
|
goto out;
|
|
}
|
|
|
|
if (fs_info->quota_root)
|
|
goto out;
|
|
|
|
fs_info->qgroup_ulist = ulist;
|
|
ulist = NULL;
|
|
|
|
/*
|
|
* initially create the quota tree
|
|
*/
|
|
quota_root = btrfs_create_tree(trans, BTRFS_QUOTA_TREE_OBJECTID);
|
|
if (IS_ERR(quota_root)) {
|
|
ret = PTR_ERR(quota_root);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path) {
|
|
ret = -ENOMEM;
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_root;
|
|
}
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_QGROUP_STATUS_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_insert_empty_item(trans, quota_root, path, &key,
|
|
sizeof(*ptr));
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
leaf = path->nodes[0];
|
|
ptr = btrfs_item_ptr(leaf, path->slots[0],
|
|
struct btrfs_qgroup_status_item);
|
|
btrfs_set_qgroup_status_generation(leaf, ptr, trans->transid);
|
|
btrfs_set_qgroup_status_version(leaf, ptr, BTRFS_QGROUP_STATUS_VERSION);
|
|
fs_info->qgroup_flags = BTRFS_QGROUP_STATUS_FLAG_ON |
|
|
BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
btrfs_set_qgroup_status_flags(leaf, ptr, fs_info->qgroup_flags &
|
|
BTRFS_QGROUP_STATUS_FLAGS_MASK);
|
|
btrfs_set_qgroup_status_rescan(leaf, ptr, 0);
|
|
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
|
|
key.objectid = 0;
|
|
key.type = BTRFS_ROOT_REF_KEY;
|
|
key.offset = 0;
|
|
|
|
btrfs_release_path(path);
|
|
ret = btrfs_search_slot_for_read(tree_root, &key, path, 1, 0);
|
|
if (ret > 0)
|
|
goto out_add_root;
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
while (1) {
|
|
slot = path->slots[0];
|
|
leaf = path->nodes[0];
|
|
btrfs_item_key_to_cpu(leaf, &found_key, slot);
|
|
|
|
if (found_key.type == BTRFS_ROOT_REF_KEY) {
|
|
|
|
/* Release locks on tree_root before we access quota_root */
|
|
btrfs_release_path(path);
|
|
|
|
ret = add_qgroup_item(trans, quota_root,
|
|
found_key.offset);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
qgroup = add_qgroup_rb(fs_info, found_key.offset);
|
|
if (IS_ERR(qgroup)) {
|
|
ret = PTR_ERR(qgroup);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
ret = btrfs_search_slot_for_read(tree_root, &found_key,
|
|
path, 1, 0);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
if (ret > 0) {
|
|
/*
|
|
* Shouldn't happen, but in case it does we
|
|
* don't need to do the btrfs_next_item, just
|
|
* continue.
|
|
*/
|
|
continue;
|
|
}
|
|
}
|
|
ret = btrfs_next_item(tree_root, path);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
out_add_root:
|
|
btrfs_release_path(path);
|
|
ret = add_qgroup_item(trans, quota_root, BTRFS_FS_TREE_OBJECTID);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
qgroup = add_qgroup_rb(fs_info, BTRFS_FS_TREE_OBJECTID);
|
|
if (IS_ERR(qgroup)) {
|
|
ret = PTR_ERR(qgroup);
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
|
|
if (ret < 0) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out_free_path;
|
|
}
|
|
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
/*
|
|
* Commit the transaction while not holding qgroup_ioctl_lock, to avoid
|
|
* a deadlock with tasks concurrently doing other qgroup operations, such
|
|
* adding/removing qgroups or adding/deleting qgroup relations for example,
|
|
* because all qgroup operations first start or join a transaction and then
|
|
* lock the qgroup_ioctl_lock mutex.
|
|
* We are safe from a concurrent task trying to enable quotas, by calling
|
|
* this function, since we are serialized by fs_info->subvol_sem.
|
|
*/
|
|
ret = btrfs_commit_transaction(trans);
|
|
trans = NULL;
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (ret)
|
|
goto out_free_path;
|
|
|
|
/*
|
|
* Set quota enabled flag after committing the transaction, to avoid
|
|
* deadlocks on fs_info->qgroup_ioctl_lock with concurrent snapshot
|
|
* creation.
|
|
*/
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
fs_info->quota_root = quota_root;
|
|
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
ret = qgroup_rescan_init(fs_info, 0, 1);
|
|
if (!ret) {
|
|
qgroup_rescan_zero_tracking(fs_info);
|
|
fs_info->qgroup_rescan_running = true;
|
|
btrfs_queue_work(fs_info->qgroup_rescan_workers,
|
|
&fs_info->qgroup_rescan_work);
|
|
} else {
|
|
/*
|
|
* We have set both BTRFS_FS_QUOTA_ENABLED and
|
|
* BTRFS_QGROUP_STATUS_FLAG_ON, so we can only fail with
|
|
* -EINPROGRESS. That can happen because someone started the
|
|
* rescan worker by calling quota rescan ioctl before we
|
|
* attempted to initialize the rescan worker. Failure due to
|
|
* quotas disabled in the meanwhile is not possible, because
|
|
* we are holding a write lock on fs_info->subvol_sem, which
|
|
* is also acquired when disabling quotas.
|
|
* Ignore such error, and any other error would need to undo
|
|
* everything we did in the transaction we just committed.
|
|
*/
|
|
ASSERT(ret == -EINPROGRESS);
|
|
ret = 0;
|
|
}
|
|
|
|
out_free_path:
|
|
btrfs_free_path(path);
|
|
out_free_root:
|
|
if (ret)
|
|
btrfs_put_root(quota_root);
|
|
out:
|
|
if (ret) {
|
|
ulist_free(fs_info->qgroup_ulist);
|
|
fs_info->qgroup_ulist = NULL;
|
|
btrfs_sysfs_del_qgroups(fs_info);
|
|
}
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
if (ret && trans)
|
|
btrfs_end_transaction(trans);
|
|
else if (trans)
|
|
ret = btrfs_end_transaction(trans);
|
|
ulist_free(ulist);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_quota_disable(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* We need to have subvol_sem write locked to prevent races with
|
|
* snapshot creation.
|
|
*/
|
|
lockdep_assert_held_write(&fs_info->subvol_sem);
|
|
|
|
/*
|
|
* Lock the cleaner mutex to prevent races with concurrent relocation,
|
|
* because relocation may be building backrefs for blocks of the quota
|
|
* root while we are deleting the root. This is like dropping fs roots
|
|
* of deleted snapshots/subvolumes, we need the same protection.
|
|
*
|
|
* This also prevents races between concurrent tasks trying to disable
|
|
* quotas, because we will unlock and relock qgroup_ioctl_lock across
|
|
* BTRFS_FS_QUOTA_ENABLED changes.
|
|
*/
|
|
mutex_lock(&fs_info->cleaner_mutex);
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_root)
|
|
goto out;
|
|
|
|
/*
|
|
* Unlock the qgroup_ioctl_lock mutex before waiting for the rescan worker to
|
|
* complete. Otherwise we can deadlock because btrfs_remove_qgroup() needs
|
|
* to lock that mutex while holding a transaction handle and the rescan
|
|
* worker needs to commit a transaction.
|
|
*/
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
|
|
/*
|
|
* Request qgroup rescan worker to complete and wait for it. This wait
|
|
* must be done before transaction start for quota disable since it may
|
|
* deadlock with transaction by the qgroup rescan worker.
|
|
*/
|
|
clear_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
|
|
btrfs_qgroup_wait_for_completion(fs_info, false);
|
|
|
|
/*
|
|
* 1 For the root item
|
|
*
|
|
* We should also reserve enough items for the quota tree deletion in
|
|
* btrfs_clean_quota_tree but this is not done.
|
|
*
|
|
* Also, we must always start a transaction without holding the mutex
|
|
* qgroup_ioctl_lock, see btrfs_quota_enable().
|
|
*/
|
|
trans = btrfs_start_transaction(fs_info->tree_root, 1);
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
trans = NULL;
|
|
set_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags);
|
|
goto out;
|
|
}
|
|
|
|
if (!fs_info->quota_root)
|
|
goto out;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
quota_root = fs_info->quota_root;
|
|
fs_info->quota_root = NULL;
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
|
|
fs_info->qgroup_drop_subtree_thres = BTRFS_MAX_LEVEL;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
btrfs_free_qgroup_config(fs_info);
|
|
|
|
ret = btrfs_clean_quota_tree(trans, quota_root);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_del_root(trans, "a_root->root_key);
|
|
if (ret) {
|
|
btrfs_abort_transaction(trans, ret);
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&fs_info->trans_lock);
|
|
list_del("a_root->dirty_list);
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
btrfs_tree_lock(quota_root->node);
|
|
btrfs_clear_buffer_dirty(trans, quota_root->node);
|
|
btrfs_tree_unlock(quota_root->node);
|
|
btrfs_free_tree_block(trans, btrfs_root_id(quota_root),
|
|
quota_root->node, 0, 1);
|
|
|
|
btrfs_put_root(quota_root);
|
|
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
if (ret && trans)
|
|
btrfs_end_transaction(trans);
|
|
else if (trans)
|
|
ret = btrfs_end_transaction(trans);
|
|
mutex_unlock(&fs_info->cleaner_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void qgroup_dirty(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_qgroup *qgroup)
|
|
{
|
|
if (list_empty(&qgroup->dirty))
|
|
list_add(&qgroup->dirty, &fs_info->dirty_qgroups);
|
|
}
|
|
|
|
/*
|
|
* The easy accounting, we're updating qgroup relationship whose child qgroup
|
|
* only has exclusive extents.
|
|
*
|
|
* In this case, all exclusive extents will also be exclusive for parent, so
|
|
* excl/rfer just get added/removed.
|
|
*
|
|
* So is qgroup reservation space, which should also be added/removed to
|
|
* parent.
|
|
* Or when child tries to release reservation space, parent will underflow its
|
|
* reservation (for relationship adding case).
|
|
*
|
|
* Caller should hold fs_info->qgroup_lock.
|
|
*/
|
|
static int __qgroup_excl_accounting(struct btrfs_fs_info *fs_info,
|
|
struct ulist *tmp, u64 ref_root,
|
|
struct btrfs_qgroup *src, int sign)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_qgroup_list *glist;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
u64 num_bytes = src->excl;
|
|
int ret = 0;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
|
|
qgroup->rfer += sign * num_bytes;
|
|
qgroup->rfer_cmpr += sign * num_bytes;
|
|
|
|
WARN_ON(sign < 0 && qgroup->excl < num_bytes);
|
|
qgroup->excl += sign * num_bytes;
|
|
qgroup->excl_cmpr += sign * num_bytes;
|
|
|
|
if (sign > 0)
|
|
qgroup_rsv_add_by_qgroup(fs_info, qgroup, src);
|
|
else
|
|
qgroup_rsv_release_by_qgroup(fs_info, qgroup, src);
|
|
|
|
qgroup_dirty(fs_info, qgroup);
|
|
|
|
/* Get all of the parent groups that contain this qgroup */
|
|
list_for_each_entry(glist, &qgroup->groups, next_group) {
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
/* Iterate all of the parents and adjust their reference counts */
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(tmp, &uiter))) {
|
|
qgroup = unode_aux_to_qgroup(unode);
|
|
qgroup->rfer += sign * num_bytes;
|
|
qgroup->rfer_cmpr += sign * num_bytes;
|
|
WARN_ON(sign < 0 && qgroup->excl < num_bytes);
|
|
qgroup->excl += sign * num_bytes;
|
|
if (sign > 0)
|
|
qgroup_rsv_add_by_qgroup(fs_info, qgroup, src);
|
|
else
|
|
qgroup_rsv_release_by_qgroup(fs_info, qgroup, src);
|
|
qgroup->excl_cmpr += sign * num_bytes;
|
|
qgroup_dirty(fs_info, qgroup);
|
|
|
|
/* Add any parents of the parents */
|
|
list_for_each_entry(glist, &qgroup->groups, next_group) {
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
|
|
/*
|
|
* Quick path for updating qgroup with only excl refs.
|
|
*
|
|
* In that case, just update all parent will be enough.
|
|
* Or we needs to do a full rescan.
|
|
* Caller should also hold fs_info->qgroup_lock.
|
|
*
|
|
* Return 0 for quick update, return >0 for need to full rescan
|
|
* and mark INCONSISTENT flag.
|
|
* Return < 0 for other error.
|
|
*/
|
|
static int quick_update_accounting(struct btrfs_fs_info *fs_info,
|
|
struct ulist *tmp, u64 src, u64 dst,
|
|
int sign)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 1;
|
|
int err = 0;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, src);
|
|
if (!qgroup)
|
|
goto out;
|
|
if (qgroup->excl == qgroup->rfer) {
|
|
ret = 0;
|
|
err = __qgroup_excl_accounting(fs_info, tmp, dst,
|
|
qgroup, sign);
|
|
if (err < 0) {
|
|
ret = err;
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
if (ret)
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_add_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
|
|
u64 dst)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_qgroup *parent;
|
|
struct btrfs_qgroup *member;
|
|
struct btrfs_qgroup_list *list;
|
|
struct ulist *tmp;
|
|
unsigned int nofs_flag;
|
|
int ret = 0;
|
|
|
|
/* Check the level of src and dst first */
|
|
if (btrfs_qgroup_level(src) >= btrfs_qgroup_level(dst))
|
|
return -EINVAL;
|
|
|
|
/* We hold a transaction handle open, must do a NOFS allocation. */
|
|
nofs_flag = memalloc_nofs_save();
|
|
tmp = ulist_alloc(GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_root) {
|
|
ret = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
member = find_qgroup_rb(fs_info, src);
|
|
parent = find_qgroup_rb(fs_info, dst);
|
|
if (!member || !parent) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
/* check if such qgroup relation exist firstly */
|
|
list_for_each_entry(list, &member->groups, next_group) {
|
|
if (list->group == parent) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
ret = add_qgroup_relation_item(trans, src, dst);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = add_qgroup_relation_item(trans, dst, src);
|
|
if (ret) {
|
|
del_qgroup_relation_item(trans, src, dst);
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
ret = __add_relation_rb(member, parent);
|
|
if (ret < 0) {
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
goto out;
|
|
}
|
|
ret = quick_update_accounting(fs_info, tmp, src, dst, 1);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
ulist_free(tmp);
|
|
return ret;
|
|
}
|
|
|
|
static int __del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
|
|
u64 dst)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_qgroup *parent;
|
|
struct btrfs_qgroup *member;
|
|
struct btrfs_qgroup_list *list;
|
|
struct ulist *tmp;
|
|
bool found = false;
|
|
unsigned int nofs_flag;
|
|
int ret = 0;
|
|
int ret2;
|
|
|
|
/* We hold a transaction handle open, must do a NOFS allocation. */
|
|
nofs_flag = memalloc_nofs_save();
|
|
tmp = ulist_alloc(GFP_KERNEL);
|
|
memalloc_nofs_restore(nofs_flag);
|
|
if (!tmp)
|
|
return -ENOMEM;
|
|
|
|
if (!fs_info->quota_root) {
|
|
ret = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
member = find_qgroup_rb(fs_info, src);
|
|
parent = find_qgroup_rb(fs_info, dst);
|
|
/*
|
|
* The parent/member pair doesn't exist, then try to delete the dead
|
|
* relation items only.
|
|
*/
|
|
if (!member || !parent)
|
|
goto delete_item;
|
|
|
|
/* check if such qgroup relation exist firstly */
|
|
list_for_each_entry(list, &member->groups, next_group) {
|
|
if (list->group == parent) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
delete_item:
|
|
ret = del_qgroup_relation_item(trans, src, dst);
|
|
if (ret < 0 && ret != -ENOENT)
|
|
goto out;
|
|
ret2 = del_qgroup_relation_item(trans, dst, src);
|
|
if (ret2 < 0 && ret2 != -ENOENT)
|
|
goto out;
|
|
|
|
/* At least one deletion succeeded, return 0 */
|
|
if (!ret || !ret2)
|
|
ret = 0;
|
|
|
|
if (found) {
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
del_relation_rb(fs_info, src, dst);
|
|
ret = quick_update_accounting(fs_info, tmp, src, dst, -1);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
}
|
|
out:
|
|
ulist_free(tmp);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_del_qgroup_relation(struct btrfs_trans_handle *trans, u64 src,
|
|
u64 dst)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
ret = __del_qgroup_relation(trans, src, dst);
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_create_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_root) {
|
|
ret = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
quota_root = fs_info->quota_root;
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (qgroup) {
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
ret = add_qgroup_item(trans, quota_root, qgroupid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
qgroup = add_qgroup_rb(fs_info, qgroupid);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
if (IS_ERR(qgroup)) {
|
|
ret = PTR_ERR(qgroup);
|
|
goto out;
|
|
}
|
|
ret = btrfs_sysfs_add_one_qgroup(fs_info, qgroup);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_remove_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_qgroup_list *list;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_root) {
|
|
ret = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (!qgroup) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
/* Check if there are no children of this qgroup */
|
|
if (!list_empty(&qgroup->members)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
ret = del_qgroup_item(trans, qgroupid);
|
|
if (ret && ret != -ENOENT)
|
|
goto out;
|
|
|
|
while (!list_empty(&qgroup->groups)) {
|
|
list = list_first_entry(&qgroup->groups,
|
|
struct btrfs_qgroup_list, next_group);
|
|
ret = __del_qgroup_relation(trans, qgroupid,
|
|
list->group->qgroupid);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
del_qgroup_rb(fs_info, qgroupid);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
/*
|
|
* Remove the qgroup from sysfs now without holding the qgroup_lock
|
|
* spinlock, since the sysfs_remove_group() function needs to take
|
|
* the mutex kernfs_mutex through kernfs_remove_by_name_ns().
|
|
*/
|
|
btrfs_sysfs_del_one_qgroup(fs_info, qgroup);
|
|
kfree(qgroup);
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_limit_qgroup(struct btrfs_trans_handle *trans, u64 qgroupid,
|
|
struct btrfs_qgroup_limit *limit)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_qgroup *qgroup;
|
|
int ret = 0;
|
|
/* Sometimes we would want to clear the limit on this qgroup.
|
|
* To meet this requirement, we treat the -1 as a special value
|
|
* which tell kernel to clear the limit on this qgroup.
|
|
*/
|
|
const u64 CLEAR_VALUE = -1;
|
|
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!fs_info->quota_root) {
|
|
ret = -ENOTCONN;
|
|
goto out;
|
|
}
|
|
|
|
qgroup = find_qgroup_rb(fs_info, qgroupid);
|
|
if (!qgroup) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_RFER) {
|
|
if (limit->max_rfer == CLEAR_VALUE) {
|
|
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
|
|
limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_RFER;
|
|
qgroup->max_rfer = 0;
|
|
} else {
|
|
qgroup->max_rfer = limit->max_rfer;
|
|
}
|
|
}
|
|
if (limit->flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) {
|
|
if (limit->max_excl == CLEAR_VALUE) {
|
|
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
|
|
limit->flags &= ~BTRFS_QGROUP_LIMIT_MAX_EXCL;
|
|
qgroup->max_excl = 0;
|
|
} else {
|
|
qgroup->max_excl = limit->max_excl;
|
|
}
|
|
}
|
|
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_RFER) {
|
|
if (limit->rsv_rfer == CLEAR_VALUE) {
|
|
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
|
|
limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_RFER;
|
|
qgroup->rsv_rfer = 0;
|
|
} else {
|
|
qgroup->rsv_rfer = limit->rsv_rfer;
|
|
}
|
|
}
|
|
if (limit->flags & BTRFS_QGROUP_LIMIT_RSV_EXCL) {
|
|
if (limit->rsv_excl == CLEAR_VALUE) {
|
|
qgroup->lim_flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
|
|
limit->flags &= ~BTRFS_QGROUP_LIMIT_RSV_EXCL;
|
|
qgroup->rsv_excl = 0;
|
|
} else {
|
|
qgroup->rsv_excl = limit->rsv_excl;
|
|
}
|
|
}
|
|
qgroup->lim_flags |= limit->flags;
|
|
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
ret = update_qgroup_limit_item(trans, qgroup);
|
|
if (ret) {
|
|
qgroup_mark_inconsistent(fs_info);
|
|
btrfs_info(fs_info, "unable to update quota limit for %llu",
|
|
qgroupid);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_qgroup_trace_extent_nolock(struct btrfs_fs_info *fs_info,
|
|
struct btrfs_delayed_ref_root *delayed_refs,
|
|
struct btrfs_qgroup_extent_record *record)
|
|
{
|
|
struct rb_node **p = &delayed_refs->dirty_extent_root.rb_node;
|
|
struct rb_node *parent_node = NULL;
|
|
struct btrfs_qgroup_extent_record *entry;
|
|
u64 bytenr = record->bytenr;
|
|
|
|
lockdep_assert_held(&delayed_refs->lock);
|
|
trace_btrfs_qgroup_trace_extent(fs_info, record);
|
|
|
|
while (*p) {
|
|
parent_node = *p;
|
|
entry = rb_entry(parent_node, struct btrfs_qgroup_extent_record,
|
|
node);
|
|
if (bytenr < entry->bytenr) {
|
|
p = &(*p)->rb_left;
|
|
} else if (bytenr > entry->bytenr) {
|
|
p = &(*p)->rb_right;
|
|
} else {
|
|
if (record->data_rsv && !entry->data_rsv) {
|
|
entry->data_rsv = record->data_rsv;
|
|
entry->data_rsv_refroot =
|
|
record->data_rsv_refroot;
|
|
}
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
rb_link_node(&record->node, parent_node, p);
|
|
rb_insert_color(&record->node, &delayed_refs->dirty_extent_root);
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_qgroup_trace_extent_post(struct btrfs_trans_handle *trans,
|
|
struct btrfs_qgroup_extent_record *qrecord)
|
|
{
|
|
struct btrfs_backref_walk_ctx ctx = { 0 };
|
|
int ret;
|
|
|
|
/*
|
|
* We are always called in a context where we are already holding a
|
|
* transaction handle. Often we are called when adding a data delayed
|
|
* reference from btrfs_truncate_inode_items() (truncating or unlinking),
|
|
* in which case we will be holding a write lock on extent buffer from a
|
|
* subvolume tree. In this case we can't allow btrfs_find_all_roots() to
|
|
* acquire fs_info->commit_root_sem, because that is a higher level lock
|
|
* that must be acquired before locking any extent buffers.
|
|
*
|
|
* So we want btrfs_find_all_roots() to not acquire the commit_root_sem
|
|
* but we can't pass it a non-NULL transaction handle, because otherwise
|
|
* it would not use commit roots and would lock extent buffers, causing
|
|
* a deadlock if it ends up trying to read lock the same extent buffer
|
|
* that was previously write locked at btrfs_truncate_inode_items().
|
|
*
|
|
* So pass a NULL transaction handle to btrfs_find_all_roots() and
|
|
* explicitly tell it to not acquire the commit_root_sem - if we are
|
|
* holding a transaction handle we don't need its protection.
|
|
*/
|
|
ASSERT(trans != NULL);
|
|
|
|
if (trans->fs_info->qgroup_flags & BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING)
|
|
return 0;
|
|
|
|
ctx.bytenr = qrecord->bytenr;
|
|
ctx.fs_info = trans->fs_info;
|
|
|
|
ret = btrfs_find_all_roots(&ctx, true);
|
|
if (ret < 0) {
|
|
qgroup_mark_inconsistent(trans->fs_info);
|
|
btrfs_warn(trans->fs_info,
|
|
"error accounting new delayed refs extent (err code: %d), quota inconsistent",
|
|
ret);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Here we don't need to get the lock of
|
|
* trans->transaction->delayed_refs, since inserted qrecord won't
|
|
* be deleted, only qrecord->node may be modified (new qrecord insert)
|
|
*
|
|
* So modifying qrecord->old_roots is safe here
|
|
*/
|
|
qrecord->old_roots = ctx.roots;
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_qgroup_trace_extent(struct btrfs_trans_handle *trans, u64 bytenr,
|
|
u64 num_bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_qgroup_extent_record *record;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
int ret;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)
|
|
|| bytenr == 0 || num_bytes == 0)
|
|
return 0;
|
|
record = kzalloc(sizeof(*record), GFP_NOFS);
|
|
if (!record)
|
|
return -ENOMEM;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
record->bytenr = bytenr;
|
|
record->num_bytes = num_bytes;
|
|
record->old_roots = NULL;
|
|
|
|
spin_lock(&delayed_refs->lock);
|
|
ret = btrfs_qgroup_trace_extent_nolock(fs_info, delayed_refs, record);
|
|
spin_unlock(&delayed_refs->lock);
|
|
if (ret > 0) {
|
|
kfree(record);
|
|
return 0;
|
|
}
|
|
return btrfs_qgroup_trace_extent_post(trans, record);
|
|
}
|
|
|
|
int btrfs_qgroup_trace_leaf_items(struct btrfs_trans_handle *trans,
|
|
struct extent_buffer *eb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
int nr = btrfs_header_nritems(eb);
|
|
int i, extent_type, ret;
|
|
struct btrfs_key key;
|
|
struct btrfs_file_extent_item *fi;
|
|
u64 bytenr, num_bytes;
|
|
|
|
/* We can be called directly from walk_up_proc() */
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
return 0;
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
btrfs_item_key_to_cpu(eb, &key, i);
|
|
|
|
if (key.type != BTRFS_EXTENT_DATA_KEY)
|
|
continue;
|
|
|
|
fi = btrfs_item_ptr(eb, i, struct btrfs_file_extent_item);
|
|
/* filter out non qgroup-accountable extents */
|
|
extent_type = btrfs_file_extent_type(eb, fi);
|
|
|
|
if (extent_type == BTRFS_FILE_EXTENT_INLINE)
|
|
continue;
|
|
|
|
bytenr = btrfs_file_extent_disk_bytenr(eb, fi);
|
|
if (!bytenr)
|
|
continue;
|
|
|
|
num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
|
|
|
|
ret = btrfs_qgroup_trace_extent(trans, bytenr, num_bytes);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
cond_resched();
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Walk up the tree from the bottom, freeing leaves and any interior
|
|
* nodes which have had all slots visited. If a node (leaf or
|
|
* interior) is freed, the node above it will have it's slot
|
|
* incremented. The root node will never be freed.
|
|
*
|
|
* At the end of this function, we should have a path which has all
|
|
* slots incremented to the next position for a search. If we need to
|
|
* read a new node it will be NULL and the node above it will have the
|
|
* correct slot selected for a later read.
|
|
*
|
|
* If we increment the root nodes slot counter past the number of
|
|
* elements, 1 is returned to signal completion of the search.
|
|
*/
|
|
static int adjust_slots_upwards(struct btrfs_path *path, int root_level)
|
|
{
|
|
int level = 0;
|
|
int nr, slot;
|
|
struct extent_buffer *eb;
|
|
|
|
if (root_level == 0)
|
|
return 1;
|
|
|
|
while (level <= root_level) {
|
|
eb = path->nodes[level];
|
|
nr = btrfs_header_nritems(eb);
|
|
path->slots[level]++;
|
|
slot = path->slots[level];
|
|
if (slot >= nr || level == 0) {
|
|
/*
|
|
* Don't free the root - we will detect this
|
|
* condition after our loop and return a
|
|
* positive value for caller to stop walking the tree.
|
|
*/
|
|
if (level != root_level) {
|
|
btrfs_tree_unlock_rw(eb, path->locks[level]);
|
|
path->locks[level] = 0;
|
|
|
|
free_extent_buffer(eb);
|
|
path->nodes[level] = NULL;
|
|
path->slots[level] = 0;
|
|
}
|
|
} else {
|
|
/*
|
|
* We have a valid slot to walk back down
|
|
* from. Stop here so caller can process these
|
|
* new nodes.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
level++;
|
|
}
|
|
|
|
eb = path->nodes[root_level];
|
|
if (path->slots[root_level] >= btrfs_header_nritems(eb))
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Helper function to trace a subtree tree block swap.
|
|
*
|
|
* The swap will happen in highest tree block, but there may be a lot of
|
|
* tree blocks involved.
|
|
*
|
|
* For example:
|
|
* OO = Old tree blocks
|
|
* NN = New tree blocks allocated during balance
|
|
*
|
|
* File tree (257) Reloc tree for 257
|
|
* L2 OO NN
|
|
* / \ / \
|
|
* L1 OO OO (a) OO NN (a)
|
|
* / \ / \ / \ / \
|
|
* L0 OO OO OO OO OO OO NN NN
|
|
* (b) (c) (b) (c)
|
|
*
|
|
* When calling qgroup_trace_extent_swap(), we will pass:
|
|
* @src_eb = OO(a)
|
|
* @dst_path = [ nodes[1] = NN(a), nodes[0] = NN(c) ]
|
|
* @dst_level = 0
|
|
* @root_level = 1
|
|
*
|
|
* In that case, qgroup_trace_extent_swap() will search from OO(a) to
|
|
* reach OO(c), then mark both OO(c) and NN(c) as qgroup dirty.
|
|
*
|
|
* The main work of qgroup_trace_extent_swap() can be split into 3 parts:
|
|
*
|
|
* 1) Tree search from @src_eb
|
|
* It should acts as a simplified btrfs_search_slot().
|
|
* The key for search can be extracted from @dst_path->nodes[dst_level]
|
|
* (first key).
|
|
*
|
|
* 2) Mark the final tree blocks in @src_path and @dst_path qgroup dirty
|
|
* NOTE: In above case, OO(a) and NN(a) won't be marked qgroup dirty.
|
|
* They should be marked during previous (@dst_level = 1) iteration.
|
|
*
|
|
* 3) Mark file extents in leaves dirty
|
|
* We don't have good way to pick out new file extents only.
|
|
* So we still follow the old method by scanning all file extents in
|
|
* the leave.
|
|
*
|
|
* This function can free us from keeping two paths, thus later we only need
|
|
* to care about how to iterate all new tree blocks in reloc tree.
|
|
*/
|
|
static int qgroup_trace_extent_swap(struct btrfs_trans_handle* trans,
|
|
struct extent_buffer *src_eb,
|
|
struct btrfs_path *dst_path,
|
|
int dst_level, int root_level,
|
|
bool trace_leaf)
|
|
{
|
|
struct btrfs_key key;
|
|
struct btrfs_path *src_path;
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
u32 nodesize = fs_info->nodesize;
|
|
int cur_level = root_level;
|
|
int ret;
|
|
|
|
BUG_ON(dst_level > root_level);
|
|
/* Level mismatch */
|
|
if (btrfs_header_level(src_eb) != root_level)
|
|
return -EINVAL;
|
|
|
|
src_path = btrfs_alloc_path();
|
|
if (!src_path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (dst_level)
|
|
btrfs_node_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
|
|
else
|
|
btrfs_item_key_to_cpu(dst_path->nodes[dst_level], &key, 0);
|
|
|
|
/* For src_path */
|
|
atomic_inc(&src_eb->refs);
|
|
src_path->nodes[root_level] = src_eb;
|
|
src_path->slots[root_level] = dst_path->slots[root_level];
|
|
src_path->locks[root_level] = 0;
|
|
|
|
/* A simplified version of btrfs_search_slot() */
|
|
while (cur_level >= dst_level) {
|
|
struct btrfs_key src_key;
|
|
struct btrfs_key dst_key;
|
|
|
|
if (src_path->nodes[cur_level] == NULL) {
|
|
struct extent_buffer *eb;
|
|
int parent_slot;
|
|
|
|
eb = src_path->nodes[cur_level + 1];
|
|
parent_slot = src_path->slots[cur_level + 1];
|
|
|
|
eb = btrfs_read_node_slot(eb, parent_slot);
|
|
if (IS_ERR(eb)) {
|
|
ret = PTR_ERR(eb);
|
|
goto out;
|
|
}
|
|
|
|
src_path->nodes[cur_level] = eb;
|
|
|
|
btrfs_tree_read_lock(eb);
|
|
src_path->locks[cur_level] = BTRFS_READ_LOCK;
|
|
}
|
|
|
|
src_path->slots[cur_level] = dst_path->slots[cur_level];
|
|
if (cur_level) {
|
|
btrfs_node_key_to_cpu(dst_path->nodes[cur_level],
|
|
&dst_key, dst_path->slots[cur_level]);
|
|
btrfs_node_key_to_cpu(src_path->nodes[cur_level],
|
|
&src_key, src_path->slots[cur_level]);
|
|
} else {
|
|
btrfs_item_key_to_cpu(dst_path->nodes[cur_level],
|
|
&dst_key, dst_path->slots[cur_level]);
|
|
btrfs_item_key_to_cpu(src_path->nodes[cur_level],
|
|
&src_key, src_path->slots[cur_level]);
|
|
}
|
|
/* Content mismatch, something went wrong */
|
|
if (btrfs_comp_cpu_keys(&dst_key, &src_key)) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
cur_level--;
|
|
}
|
|
|
|
/*
|
|
* Now both @dst_path and @src_path have been populated, record the tree
|
|
* blocks for qgroup accounting.
|
|
*/
|
|
ret = btrfs_qgroup_trace_extent(trans, src_path->nodes[dst_level]->start,
|
|
nodesize);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = btrfs_qgroup_trace_extent(trans, dst_path->nodes[dst_level]->start,
|
|
nodesize);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Record leaf file extents */
|
|
if (dst_level == 0 && trace_leaf) {
|
|
ret = btrfs_qgroup_trace_leaf_items(trans, src_path->nodes[0]);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = btrfs_qgroup_trace_leaf_items(trans, dst_path->nodes[0]);
|
|
}
|
|
out:
|
|
btrfs_free_path(src_path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Helper function to do recursive generation-aware depth-first search, to
|
|
* locate all new tree blocks in a subtree of reloc tree.
|
|
*
|
|
* E.g. (OO = Old tree blocks, NN = New tree blocks, whose gen == last_snapshot)
|
|
* reloc tree
|
|
* L2 NN (a)
|
|
* / \
|
|
* L1 OO NN (b)
|
|
* / \ / \
|
|
* L0 OO OO OO NN
|
|
* (c) (d)
|
|
* If we pass:
|
|
* @dst_path = [ nodes[1] = NN(b), nodes[0] = NULL ],
|
|
* @cur_level = 1
|
|
* @root_level = 1
|
|
*
|
|
* We will iterate through tree blocks NN(b), NN(d) and info qgroup to trace
|
|
* above tree blocks along with their counter parts in file tree.
|
|
* While during search, old tree blocks OO(c) will be skipped as tree block swap
|
|
* won't affect OO(c).
|
|
*/
|
|
static int qgroup_trace_new_subtree_blocks(struct btrfs_trans_handle* trans,
|
|
struct extent_buffer *src_eb,
|
|
struct btrfs_path *dst_path,
|
|
int cur_level, int root_level,
|
|
u64 last_snapshot, bool trace_leaf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct extent_buffer *eb;
|
|
bool need_cleanup = false;
|
|
int ret = 0;
|
|
int i;
|
|
|
|
/* Level sanity check */
|
|
if (cur_level < 0 || cur_level >= BTRFS_MAX_LEVEL - 1 ||
|
|
root_level < 0 || root_level >= BTRFS_MAX_LEVEL - 1 ||
|
|
root_level < cur_level) {
|
|
btrfs_err_rl(fs_info,
|
|
"%s: bad levels, cur_level=%d root_level=%d",
|
|
__func__, cur_level, root_level);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/* Read the tree block if needed */
|
|
if (dst_path->nodes[cur_level] == NULL) {
|
|
int parent_slot;
|
|
u64 child_gen;
|
|
|
|
/*
|
|
* dst_path->nodes[root_level] must be initialized before
|
|
* calling this function.
|
|
*/
|
|
if (cur_level == root_level) {
|
|
btrfs_err_rl(fs_info,
|
|
"%s: dst_path->nodes[%d] not initialized, root_level=%d cur_level=%d",
|
|
__func__, root_level, root_level, cur_level);
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
/*
|
|
* We need to get child blockptr/gen from parent before we can
|
|
* read it.
|
|
*/
|
|
eb = dst_path->nodes[cur_level + 1];
|
|
parent_slot = dst_path->slots[cur_level + 1];
|
|
child_gen = btrfs_node_ptr_generation(eb, parent_slot);
|
|
|
|
/* This node is old, no need to trace */
|
|
if (child_gen < last_snapshot)
|
|
goto out;
|
|
|
|
eb = btrfs_read_node_slot(eb, parent_slot);
|
|
if (IS_ERR(eb)) {
|
|
ret = PTR_ERR(eb);
|
|
goto out;
|
|
}
|
|
|
|
dst_path->nodes[cur_level] = eb;
|
|
dst_path->slots[cur_level] = 0;
|
|
|
|
btrfs_tree_read_lock(eb);
|
|
dst_path->locks[cur_level] = BTRFS_READ_LOCK;
|
|
need_cleanup = true;
|
|
}
|
|
|
|
/* Now record this tree block and its counter part for qgroups */
|
|
ret = qgroup_trace_extent_swap(trans, src_eb, dst_path, cur_level,
|
|
root_level, trace_leaf);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
|
|
eb = dst_path->nodes[cur_level];
|
|
|
|
if (cur_level > 0) {
|
|
/* Iterate all child tree blocks */
|
|
for (i = 0; i < btrfs_header_nritems(eb); i++) {
|
|
/* Skip old tree blocks as they won't be swapped */
|
|
if (btrfs_node_ptr_generation(eb, i) < last_snapshot)
|
|
continue;
|
|
dst_path->slots[cur_level] = i;
|
|
|
|
/* Recursive call (at most 7 times) */
|
|
ret = qgroup_trace_new_subtree_blocks(trans, src_eb,
|
|
dst_path, cur_level - 1, root_level,
|
|
last_snapshot, trace_leaf);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
}
|
|
}
|
|
|
|
cleanup:
|
|
if (need_cleanup) {
|
|
/* Clean up */
|
|
btrfs_tree_unlock_rw(dst_path->nodes[cur_level],
|
|
dst_path->locks[cur_level]);
|
|
free_extent_buffer(dst_path->nodes[cur_level]);
|
|
dst_path->nodes[cur_level] = NULL;
|
|
dst_path->slots[cur_level] = 0;
|
|
dst_path->locks[cur_level] = 0;
|
|
}
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int qgroup_trace_subtree_swap(struct btrfs_trans_handle *trans,
|
|
struct extent_buffer *src_eb,
|
|
struct extent_buffer *dst_eb,
|
|
u64 last_snapshot, bool trace_leaf)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_path *dst_path = NULL;
|
|
int level;
|
|
int ret;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
return 0;
|
|
|
|
/* Wrong parameter order */
|
|
if (btrfs_header_generation(src_eb) > btrfs_header_generation(dst_eb)) {
|
|
btrfs_err_rl(fs_info,
|
|
"%s: bad parameter order, src_gen=%llu dst_gen=%llu", __func__,
|
|
btrfs_header_generation(src_eb),
|
|
btrfs_header_generation(dst_eb));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
if (!extent_buffer_uptodate(src_eb) || !extent_buffer_uptodate(dst_eb)) {
|
|
ret = -EIO;
|
|
goto out;
|
|
}
|
|
|
|
level = btrfs_header_level(dst_eb);
|
|
dst_path = btrfs_alloc_path();
|
|
if (!dst_path) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
/* For dst_path */
|
|
atomic_inc(&dst_eb->refs);
|
|
dst_path->nodes[level] = dst_eb;
|
|
dst_path->slots[level] = 0;
|
|
dst_path->locks[level] = 0;
|
|
|
|
/* Do the generation aware breadth-first search */
|
|
ret = qgroup_trace_new_subtree_blocks(trans, src_eb, dst_path, level,
|
|
level, last_snapshot, trace_leaf);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = 0;
|
|
|
|
out:
|
|
btrfs_free_path(dst_path);
|
|
if (ret < 0)
|
|
qgroup_mark_inconsistent(fs_info);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_qgroup_trace_subtree(struct btrfs_trans_handle *trans,
|
|
struct extent_buffer *root_eb,
|
|
u64 root_gen, int root_level)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
int ret = 0;
|
|
int level;
|
|
u8 drop_subptree_thres;
|
|
struct extent_buffer *eb = root_eb;
|
|
struct btrfs_path *path = NULL;
|
|
|
|
BUG_ON(root_level < 0 || root_level >= BTRFS_MAX_LEVEL);
|
|
BUG_ON(root_eb == NULL);
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
return 0;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
drop_subptree_thres = fs_info->qgroup_drop_subtree_thres;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
/*
|
|
* This function only gets called for snapshot drop, if we hit a high
|
|
* node here, it means we are going to change ownership for quite a lot
|
|
* of extents, which will greatly slow down btrfs_commit_transaction().
|
|
*
|
|
* So here if we find a high tree here, we just skip the accounting and
|
|
* mark qgroup inconsistent.
|
|
*/
|
|
if (root_level >= drop_subptree_thres) {
|
|
qgroup_mark_inconsistent(fs_info);
|
|
return 0;
|
|
}
|
|
|
|
if (!extent_buffer_uptodate(root_eb)) {
|
|
struct btrfs_tree_parent_check check = {
|
|
.has_first_key = false,
|
|
.transid = root_gen,
|
|
.level = root_level
|
|
};
|
|
|
|
ret = btrfs_read_extent_buffer(root_eb, &check);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (root_level == 0) {
|
|
ret = btrfs_qgroup_trace_leaf_items(trans, root_eb);
|
|
goto out;
|
|
}
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
/*
|
|
* Walk down the tree. Missing extent blocks are filled in as
|
|
* we go. Metadata is accounted every time we read a new
|
|
* extent block.
|
|
*
|
|
* When we reach a leaf, we account for file extent items in it,
|
|
* walk back up the tree (adjusting slot pointers as we go)
|
|
* and restart the search process.
|
|
*/
|
|
atomic_inc(&root_eb->refs); /* For path */
|
|
path->nodes[root_level] = root_eb;
|
|
path->slots[root_level] = 0;
|
|
path->locks[root_level] = 0; /* so release_path doesn't try to unlock */
|
|
walk_down:
|
|
level = root_level;
|
|
while (level >= 0) {
|
|
if (path->nodes[level] == NULL) {
|
|
int parent_slot;
|
|
u64 child_bytenr;
|
|
|
|
/*
|
|
* We need to get child blockptr from parent before we
|
|
* can read it.
|
|
*/
|
|
eb = path->nodes[level + 1];
|
|
parent_slot = path->slots[level + 1];
|
|
child_bytenr = btrfs_node_blockptr(eb, parent_slot);
|
|
|
|
eb = btrfs_read_node_slot(eb, parent_slot);
|
|
if (IS_ERR(eb)) {
|
|
ret = PTR_ERR(eb);
|
|
goto out;
|
|
}
|
|
|
|
path->nodes[level] = eb;
|
|
path->slots[level] = 0;
|
|
|
|
btrfs_tree_read_lock(eb);
|
|
path->locks[level] = BTRFS_READ_LOCK;
|
|
|
|
ret = btrfs_qgroup_trace_extent(trans, child_bytenr,
|
|
fs_info->nodesize);
|
|
if (ret)
|
|
goto out;
|
|
}
|
|
|
|
if (level == 0) {
|
|
ret = btrfs_qgroup_trace_leaf_items(trans,
|
|
path->nodes[level]);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/* Nonzero return here means we completed our search */
|
|
ret = adjust_slots_upwards(path, root_level);
|
|
if (ret)
|
|
break;
|
|
|
|
/* Restart search with new slots */
|
|
goto walk_down;
|
|
}
|
|
|
|
level--;
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define UPDATE_NEW 0
|
|
#define UPDATE_OLD 1
|
|
/*
|
|
* Walk all of the roots that points to the bytenr and adjust their refcnts.
|
|
*/
|
|
static int qgroup_update_refcnt(struct btrfs_fs_info *fs_info,
|
|
struct ulist *roots, struct ulist *tmp,
|
|
struct ulist *qgroups, u64 seq, int update_old)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct ulist_node *tmp_unode;
|
|
struct ulist_iterator tmp_uiter;
|
|
struct btrfs_qgroup *qg;
|
|
int ret = 0;
|
|
|
|
if (!roots)
|
|
return 0;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(roots, &uiter))) {
|
|
qg = find_qgroup_rb(fs_info, unode->val);
|
|
if (!qg)
|
|
continue;
|
|
|
|
ulist_reinit(tmp);
|
|
ret = ulist_add(qgroups, qg->qgroupid, qgroup_to_aux(qg),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(tmp, qg->qgroupid, qgroup_to_aux(qg), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ULIST_ITER_INIT(&tmp_uiter);
|
|
while ((tmp_unode = ulist_next(tmp, &tmp_uiter))) {
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = unode_aux_to_qgroup(tmp_unode);
|
|
if (update_old)
|
|
btrfs_qgroup_update_old_refcnt(qg, seq, 1);
|
|
else
|
|
btrfs_qgroup_update_new_refcnt(qg, seq, 1);
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(qgroups, glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = ulist_add(tmp, glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group),
|
|
GFP_ATOMIC);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Update qgroup rfer/excl counters.
|
|
* Rfer update is easy, codes can explain themselves.
|
|
*
|
|
* Excl update is tricky, the update is split into 2 parts.
|
|
* Part 1: Possible exclusive <-> sharing detect:
|
|
* | A | !A |
|
|
* -------------------------------------
|
|
* B | * | - |
|
|
* -------------------------------------
|
|
* !B | + | ** |
|
|
* -------------------------------------
|
|
*
|
|
* Conditions:
|
|
* A: cur_old_roots < nr_old_roots (not exclusive before)
|
|
* !A: cur_old_roots == nr_old_roots (possible exclusive before)
|
|
* B: cur_new_roots < nr_new_roots (not exclusive now)
|
|
* !B: cur_new_roots == nr_new_roots (possible exclusive now)
|
|
*
|
|
* Results:
|
|
* +: Possible sharing -> exclusive -: Possible exclusive -> sharing
|
|
* *: Definitely not changed. **: Possible unchanged.
|
|
*
|
|
* For !A and !B condition, the exception is cur_old/new_roots == 0 case.
|
|
*
|
|
* To make the logic clear, we first use condition A and B to split
|
|
* combination into 4 results.
|
|
*
|
|
* Then, for result "+" and "-", check old/new_roots == 0 case, as in them
|
|
* only on variant maybe 0.
|
|
*
|
|
* Lastly, check result **, since there are 2 variants maybe 0, split them
|
|
* again(2x2).
|
|
* But this time we don't need to consider other things, the codes and logic
|
|
* is easy to understand now.
|
|
*/
|
|
static int qgroup_update_counters(struct btrfs_fs_info *fs_info,
|
|
struct ulist *qgroups,
|
|
u64 nr_old_roots,
|
|
u64 nr_new_roots,
|
|
u64 num_bytes, u64 seq)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct btrfs_qgroup *qg;
|
|
u64 cur_new_count, cur_old_count;
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(qgroups, &uiter))) {
|
|
bool dirty = false;
|
|
|
|
qg = unode_aux_to_qgroup(unode);
|
|
cur_old_count = btrfs_qgroup_get_old_refcnt(qg, seq);
|
|
cur_new_count = btrfs_qgroup_get_new_refcnt(qg, seq);
|
|
|
|
trace_qgroup_update_counters(fs_info, qg, cur_old_count,
|
|
cur_new_count);
|
|
|
|
/* Rfer update part */
|
|
if (cur_old_count == 0 && cur_new_count > 0) {
|
|
qg->rfer += num_bytes;
|
|
qg->rfer_cmpr += num_bytes;
|
|
dirty = true;
|
|
}
|
|
if (cur_old_count > 0 && cur_new_count == 0) {
|
|
qg->rfer -= num_bytes;
|
|
qg->rfer_cmpr -= num_bytes;
|
|
dirty = true;
|
|
}
|
|
|
|
/* Excl update part */
|
|
/* Exclusive/none -> shared case */
|
|
if (cur_old_count == nr_old_roots &&
|
|
cur_new_count < nr_new_roots) {
|
|
/* Exclusive -> shared */
|
|
if (cur_old_count != 0) {
|
|
qg->excl -= num_bytes;
|
|
qg->excl_cmpr -= num_bytes;
|
|
dirty = true;
|
|
}
|
|
}
|
|
|
|
/* Shared -> exclusive/none case */
|
|
if (cur_old_count < nr_old_roots &&
|
|
cur_new_count == nr_new_roots) {
|
|
/* Shared->exclusive */
|
|
if (cur_new_count != 0) {
|
|
qg->excl += num_bytes;
|
|
qg->excl_cmpr += num_bytes;
|
|
dirty = true;
|
|
}
|
|
}
|
|
|
|
/* Exclusive/none -> exclusive/none case */
|
|
if (cur_old_count == nr_old_roots &&
|
|
cur_new_count == nr_new_roots) {
|
|
if (cur_old_count == 0) {
|
|
/* None -> exclusive/none */
|
|
|
|
if (cur_new_count != 0) {
|
|
/* None -> exclusive */
|
|
qg->excl += num_bytes;
|
|
qg->excl_cmpr += num_bytes;
|
|
dirty = true;
|
|
}
|
|
/* None -> none, nothing changed */
|
|
} else {
|
|
/* Exclusive -> exclusive/none */
|
|
|
|
if (cur_new_count == 0) {
|
|
/* Exclusive -> none */
|
|
qg->excl -= num_bytes;
|
|
qg->excl_cmpr -= num_bytes;
|
|
dirty = true;
|
|
}
|
|
/* Exclusive -> exclusive, nothing changed */
|
|
}
|
|
}
|
|
|
|
if (dirty)
|
|
qgroup_dirty(fs_info, qg);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check if the @roots potentially is a list of fs tree roots
|
|
*
|
|
* Return 0 for definitely not a fs/subvol tree roots ulist
|
|
* Return 1 for possible fs/subvol tree roots in the list (considering an empty
|
|
* one as well)
|
|
*/
|
|
static int maybe_fs_roots(struct ulist *roots)
|
|
{
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
|
|
/* Empty one, still possible for fs roots */
|
|
if (!roots || roots->nnodes == 0)
|
|
return 1;
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
unode = ulist_next(roots, &uiter);
|
|
if (!unode)
|
|
return 1;
|
|
|
|
/*
|
|
* If it contains fs tree roots, then it must belong to fs/subvol
|
|
* trees.
|
|
* If it contains a non-fs tree, it won't be shared with fs/subvol trees.
|
|
*/
|
|
return is_fstree(unode->val);
|
|
}
|
|
|
|
int btrfs_qgroup_account_extent(struct btrfs_trans_handle *trans, u64 bytenr,
|
|
u64 num_bytes, struct ulist *old_roots,
|
|
struct ulist *new_roots)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct ulist *qgroups = NULL;
|
|
struct ulist *tmp = NULL;
|
|
u64 seq;
|
|
u64 nr_new_roots = 0;
|
|
u64 nr_old_roots = 0;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* If quotas get disabled meanwhile, the resources need to be freed and
|
|
* we can't just exit here.
|
|
*/
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
|
|
fs_info->qgroup_flags & BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING)
|
|
goto out_free;
|
|
|
|
if (new_roots) {
|
|
if (!maybe_fs_roots(new_roots))
|
|
goto out_free;
|
|
nr_new_roots = new_roots->nnodes;
|
|
}
|
|
if (old_roots) {
|
|
if (!maybe_fs_roots(old_roots))
|
|
goto out_free;
|
|
nr_old_roots = old_roots->nnodes;
|
|
}
|
|
|
|
/* Quick exit, either not fs tree roots, or won't affect any qgroup */
|
|
if (nr_old_roots == 0 && nr_new_roots == 0)
|
|
goto out_free;
|
|
|
|
BUG_ON(!fs_info->quota_root);
|
|
|
|
trace_btrfs_qgroup_account_extent(fs_info, trans->transid, bytenr,
|
|
num_bytes, nr_old_roots, nr_new_roots);
|
|
|
|
qgroups = ulist_alloc(GFP_NOFS);
|
|
if (!qgroups) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
tmp = ulist_alloc(GFP_NOFS);
|
|
if (!tmp) {
|
|
ret = -ENOMEM;
|
|
goto out_free;
|
|
}
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
|
|
if (fs_info->qgroup_rescan_progress.objectid <= bytenr) {
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
ret = 0;
|
|
goto out_free;
|
|
}
|
|
}
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
seq = fs_info->qgroup_seq;
|
|
|
|
/* Update old refcnts using old_roots */
|
|
ret = qgroup_update_refcnt(fs_info, old_roots, tmp, qgroups, seq,
|
|
UPDATE_OLD);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
/* Update new refcnts using new_roots */
|
|
ret = qgroup_update_refcnt(fs_info, new_roots, tmp, qgroups, seq,
|
|
UPDATE_NEW);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
qgroup_update_counters(fs_info, qgroups, nr_old_roots, nr_new_roots,
|
|
num_bytes, seq);
|
|
|
|
/*
|
|
* Bump qgroup_seq to avoid seq overlap
|
|
*/
|
|
fs_info->qgroup_seq += max(nr_old_roots, nr_new_roots) + 1;
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
out_free:
|
|
ulist_free(tmp);
|
|
ulist_free(qgroups);
|
|
ulist_free(old_roots);
|
|
ulist_free(new_roots);
|
|
return ret;
|
|
}
|
|
|
|
int btrfs_qgroup_account_extents(struct btrfs_trans_handle *trans)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_qgroup_extent_record *record;
|
|
struct btrfs_delayed_ref_root *delayed_refs;
|
|
struct ulist *new_roots = NULL;
|
|
struct rb_node *node;
|
|
u64 num_dirty_extents = 0;
|
|
u64 qgroup_to_skip;
|
|
int ret = 0;
|
|
|
|
delayed_refs = &trans->transaction->delayed_refs;
|
|
qgroup_to_skip = delayed_refs->qgroup_to_skip;
|
|
while ((node = rb_first(&delayed_refs->dirty_extent_root))) {
|
|
record = rb_entry(node, struct btrfs_qgroup_extent_record,
|
|
node);
|
|
|
|
num_dirty_extents++;
|
|
trace_btrfs_qgroup_account_extents(fs_info, record);
|
|
|
|
if (!ret && !(fs_info->qgroup_flags &
|
|
BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING)) {
|
|
struct btrfs_backref_walk_ctx ctx = { 0 };
|
|
|
|
ctx.bytenr = record->bytenr;
|
|
ctx.fs_info = fs_info;
|
|
|
|
/*
|
|
* Old roots should be searched when inserting qgroup
|
|
* extent record.
|
|
*
|
|
* But for INCONSISTENT (NO_ACCOUNTING) -> rescan case,
|
|
* we may have some record inserted during
|
|
* NO_ACCOUNTING (thus no old_roots populated), but
|
|
* later we start rescan, which clears NO_ACCOUNTING,
|
|
* leaving some inserted records without old_roots
|
|
* populated.
|
|
*
|
|
* Those cases are rare and should not cause too much
|
|
* time spent during commit_transaction().
|
|
*/
|
|
if (!record->old_roots) {
|
|
/* Search commit root to find old_roots */
|
|
ret = btrfs_find_all_roots(&ctx, false);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
record->old_roots = ctx.roots;
|
|
ctx.roots = NULL;
|
|
}
|
|
|
|
/* Free the reserved data space */
|
|
btrfs_qgroup_free_refroot(fs_info,
|
|
record->data_rsv_refroot,
|
|
record->data_rsv,
|
|
BTRFS_QGROUP_RSV_DATA);
|
|
/*
|
|
* Use BTRFS_SEQ_LAST as time_seq to do special search,
|
|
* which doesn't lock tree or delayed_refs and search
|
|
* current root. It's safe inside commit_transaction().
|
|
*/
|
|
ctx.trans = trans;
|
|
ctx.time_seq = BTRFS_SEQ_LAST;
|
|
ret = btrfs_find_all_roots(&ctx, false);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
new_roots = ctx.roots;
|
|
if (qgroup_to_skip) {
|
|
ulist_del(new_roots, qgroup_to_skip, 0);
|
|
ulist_del(record->old_roots, qgroup_to_skip,
|
|
0);
|
|
}
|
|
ret = btrfs_qgroup_account_extent(trans, record->bytenr,
|
|
record->num_bytes,
|
|
record->old_roots,
|
|
new_roots);
|
|
record->old_roots = NULL;
|
|
new_roots = NULL;
|
|
}
|
|
cleanup:
|
|
ulist_free(record->old_roots);
|
|
ulist_free(new_roots);
|
|
new_roots = NULL;
|
|
rb_erase(node, &delayed_refs->dirty_extent_root);
|
|
kfree(record);
|
|
|
|
}
|
|
trace_qgroup_num_dirty_extents(fs_info, trans->transid,
|
|
num_dirty_extents);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Writes all changed qgroups to disk.
|
|
* Called by the transaction commit path and the qgroup assign ioctl.
|
|
*/
|
|
int btrfs_run_qgroups(struct btrfs_trans_handle *trans)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
int ret = 0;
|
|
|
|
/*
|
|
* In case we are called from the qgroup assign ioctl, assert that we
|
|
* are holding the qgroup_ioctl_lock, otherwise we can race with a quota
|
|
* disable operation (ioctl) and access a freed quota root.
|
|
*/
|
|
if (trans->transaction->state != TRANS_STATE_COMMIT_DOING)
|
|
lockdep_assert_held(&fs_info->qgroup_ioctl_lock);
|
|
|
|
if (!fs_info->quota_root)
|
|
return ret;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
while (!list_empty(&fs_info->dirty_qgroups)) {
|
|
struct btrfs_qgroup *qgroup;
|
|
qgroup = list_first_entry(&fs_info->dirty_qgroups,
|
|
struct btrfs_qgroup, dirty);
|
|
list_del_init(&qgroup->dirty);
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
ret = update_qgroup_info_item(trans, qgroup);
|
|
if (ret)
|
|
qgroup_mark_inconsistent(fs_info);
|
|
ret = update_qgroup_limit_item(trans, qgroup);
|
|
if (ret)
|
|
qgroup_mark_inconsistent(fs_info);
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
}
|
|
if (test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_ON;
|
|
else
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_ON;
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
|
|
ret = update_qgroup_status_item(trans);
|
|
if (ret)
|
|
qgroup_mark_inconsistent(fs_info);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Copy the accounting information between qgroups. This is necessary
|
|
* when a snapshot or a subvolume is created. Throwing an error will
|
|
* cause a transaction abort so we take extra care here to only error
|
|
* when a readonly fs is a reasonable outcome.
|
|
*/
|
|
int btrfs_qgroup_inherit(struct btrfs_trans_handle *trans, u64 srcid,
|
|
u64 objectid, struct btrfs_qgroup_inherit *inherit)
|
|
{
|
|
int ret = 0;
|
|
int i;
|
|
u64 *i_qgroups;
|
|
bool committing = false;
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_root *quota_root;
|
|
struct btrfs_qgroup *srcgroup;
|
|
struct btrfs_qgroup *dstgroup;
|
|
bool need_rescan = false;
|
|
u32 level_size = 0;
|
|
u64 nums;
|
|
|
|
/*
|
|
* There are only two callers of this function.
|
|
*
|
|
* One in create_subvol() in the ioctl context, which needs to hold
|
|
* the qgroup_ioctl_lock.
|
|
*
|
|
* The other one in create_pending_snapshot() where no other qgroup
|
|
* code can modify the fs as they all need to either start a new trans
|
|
* or hold a trans handler, thus we don't need to hold
|
|
* qgroup_ioctl_lock.
|
|
* This would avoid long and complex lock chain and make lockdep happy.
|
|
*/
|
|
spin_lock(&fs_info->trans_lock);
|
|
if (trans->transaction->state == TRANS_STATE_COMMIT_DOING)
|
|
committing = true;
|
|
spin_unlock(&fs_info->trans_lock);
|
|
|
|
if (!committing)
|
|
mutex_lock(&fs_info->qgroup_ioctl_lock);
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
goto out;
|
|
|
|
quota_root = fs_info->quota_root;
|
|
if (!quota_root) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
if (inherit) {
|
|
i_qgroups = (u64 *)(inherit + 1);
|
|
nums = inherit->num_qgroups + 2 * inherit->num_ref_copies +
|
|
2 * inherit->num_excl_copies;
|
|
for (i = 0; i < nums; ++i) {
|
|
srcgroup = find_qgroup_rb(fs_info, *i_qgroups);
|
|
|
|
/*
|
|
* Zero out invalid groups so we can ignore
|
|
* them later.
|
|
*/
|
|
if (!srcgroup ||
|
|
((srcgroup->qgroupid >> 48) <= (objectid >> 48)))
|
|
*i_qgroups = 0ULL;
|
|
|
|
++i_qgroups;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* create a tracking group for the subvol itself
|
|
*/
|
|
ret = add_qgroup_item(trans, quota_root, objectid);
|
|
if (ret)
|
|
goto out;
|
|
|
|
/*
|
|
* add qgroup to all inherited groups
|
|
*/
|
|
if (inherit) {
|
|
i_qgroups = (u64 *)(inherit + 1);
|
|
for (i = 0; i < inherit->num_qgroups; ++i, ++i_qgroups) {
|
|
if (*i_qgroups == 0)
|
|
continue;
|
|
ret = add_qgroup_relation_item(trans, objectid,
|
|
*i_qgroups);
|
|
if (ret && ret != -EEXIST)
|
|
goto out;
|
|
ret = add_qgroup_relation_item(trans, *i_qgroups,
|
|
objectid);
|
|
if (ret && ret != -EEXIST)
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
}
|
|
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
|
|
dstgroup = add_qgroup_rb(fs_info, objectid);
|
|
if (IS_ERR(dstgroup)) {
|
|
ret = PTR_ERR(dstgroup);
|
|
goto unlock;
|
|
}
|
|
|
|
if (inherit && inherit->flags & BTRFS_QGROUP_INHERIT_SET_LIMITS) {
|
|
dstgroup->lim_flags = inherit->lim.flags;
|
|
dstgroup->max_rfer = inherit->lim.max_rfer;
|
|
dstgroup->max_excl = inherit->lim.max_excl;
|
|
dstgroup->rsv_rfer = inherit->lim.rsv_rfer;
|
|
dstgroup->rsv_excl = inherit->lim.rsv_excl;
|
|
|
|
qgroup_dirty(fs_info, dstgroup);
|
|
}
|
|
|
|
if (srcid) {
|
|
srcgroup = find_qgroup_rb(fs_info, srcid);
|
|
if (!srcgroup)
|
|
goto unlock;
|
|
|
|
/*
|
|
* We call inherit after we clone the root in order to make sure
|
|
* our counts don't go crazy, so at this point the only
|
|
* difference between the two roots should be the root node.
|
|
*/
|
|
level_size = fs_info->nodesize;
|
|
dstgroup->rfer = srcgroup->rfer;
|
|
dstgroup->rfer_cmpr = srcgroup->rfer_cmpr;
|
|
dstgroup->excl = level_size;
|
|
dstgroup->excl_cmpr = level_size;
|
|
srcgroup->excl = level_size;
|
|
srcgroup->excl_cmpr = level_size;
|
|
|
|
/* inherit the limit info */
|
|
dstgroup->lim_flags = srcgroup->lim_flags;
|
|
dstgroup->max_rfer = srcgroup->max_rfer;
|
|
dstgroup->max_excl = srcgroup->max_excl;
|
|
dstgroup->rsv_rfer = srcgroup->rsv_rfer;
|
|
dstgroup->rsv_excl = srcgroup->rsv_excl;
|
|
|
|
qgroup_dirty(fs_info, dstgroup);
|
|
qgroup_dirty(fs_info, srcgroup);
|
|
}
|
|
|
|
if (!inherit)
|
|
goto unlock;
|
|
|
|
i_qgroups = (u64 *)(inherit + 1);
|
|
for (i = 0; i < inherit->num_qgroups; ++i) {
|
|
if (*i_qgroups) {
|
|
ret = add_relation_rb(fs_info, objectid, *i_qgroups);
|
|
if (ret)
|
|
goto unlock;
|
|
}
|
|
++i_qgroups;
|
|
|
|
/*
|
|
* If we're doing a snapshot, and adding the snapshot to a new
|
|
* qgroup, the numbers are guaranteed to be incorrect.
|
|
*/
|
|
if (srcid)
|
|
need_rescan = true;
|
|
}
|
|
|
|
for (i = 0; i < inherit->num_ref_copies; ++i, i_qgroups += 2) {
|
|
struct btrfs_qgroup *src;
|
|
struct btrfs_qgroup *dst;
|
|
|
|
if (!i_qgroups[0] || !i_qgroups[1])
|
|
continue;
|
|
|
|
src = find_qgroup_rb(fs_info, i_qgroups[0]);
|
|
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
|
|
|
|
if (!src || !dst) {
|
|
ret = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
dst->rfer = src->rfer - level_size;
|
|
dst->rfer_cmpr = src->rfer_cmpr - level_size;
|
|
|
|
/* Manually tweaking numbers certainly needs a rescan */
|
|
need_rescan = true;
|
|
}
|
|
for (i = 0; i < inherit->num_excl_copies; ++i, i_qgroups += 2) {
|
|
struct btrfs_qgroup *src;
|
|
struct btrfs_qgroup *dst;
|
|
|
|
if (!i_qgroups[0] || !i_qgroups[1])
|
|
continue;
|
|
|
|
src = find_qgroup_rb(fs_info, i_qgroups[0]);
|
|
dst = find_qgroup_rb(fs_info, i_qgroups[1]);
|
|
|
|
if (!src || !dst) {
|
|
ret = -EINVAL;
|
|
goto unlock;
|
|
}
|
|
|
|
dst->excl = src->excl + level_size;
|
|
dst->excl_cmpr = src->excl_cmpr + level_size;
|
|
need_rescan = true;
|
|
}
|
|
|
|
unlock:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
if (!ret)
|
|
ret = btrfs_sysfs_add_one_qgroup(fs_info, dstgroup);
|
|
out:
|
|
if (!committing)
|
|
mutex_unlock(&fs_info->qgroup_ioctl_lock);
|
|
if (need_rescan)
|
|
qgroup_mark_inconsistent(fs_info);
|
|
return ret;
|
|
}
|
|
|
|
static bool qgroup_check_limits(const struct btrfs_qgroup *qg, u64 num_bytes)
|
|
{
|
|
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_RFER) &&
|
|
qgroup_rsv_total(qg) + (s64)qg->rfer + num_bytes > qg->max_rfer)
|
|
return false;
|
|
|
|
if ((qg->lim_flags & BTRFS_QGROUP_LIMIT_MAX_EXCL) &&
|
|
qgroup_rsv_total(qg) + (s64)qg->excl + num_bytes > qg->max_excl)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static int qgroup_reserve(struct btrfs_root *root, u64 num_bytes, bool enforce,
|
|
enum btrfs_qgroup_rsv_type type)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
u64 ref_root = root->root_key.objectid;
|
|
int ret = 0;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
|
|
if (!is_fstree(ref_root))
|
|
return 0;
|
|
|
|
if (num_bytes == 0)
|
|
return 0;
|
|
|
|
if (test_bit(BTRFS_FS_QUOTA_OVERRIDE, &fs_info->flags) &&
|
|
capable(CAP_SYS_RESOURCE))
|
|
enforce = false;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
if (!fs_info->quota_root)
|
|
goto out;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
|
|
/*
|
|
* in a first step, we check all affected qgroups if any limits would
|
|
* be exceeded
|
|
*/
|
|
ulist_reinit(fs_info->qgroup_ulist);
|
|
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
|
|
qgroup_to_aux(qgroup), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = unode_aux_to_qgroup(unode);
|
|
|
|
if (enforce && !qgroup_check_limits(qg, num_bytes)) {
|
|
ret = -EDQUOT;
|
|
goto out;
|
|
}
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(fs_info->qgroup_ulist,
|
|
glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
ret = 0;
|
|
/*
|
|
* no limits exceeded, now record the reservation into all qgroups
|
|
*/
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
|
|
qg = unode_aux_to_qgroup(unode);
|
|
|
|
qgroup_rsv_add(fs_info, qg, num_bytes, type);
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Free @num_bytes of reserved space with @type for qgroup. (Normally level 0
|
|
* qgroup).
|
|
*
|
|
* Will handle all higher level qgroup too.
|
|
*
|
|
* NOTE: If @num_bytes is (u64)-1, this means to free all bytes of this qgroup.
|
|
* This special case is only used for META_PERTRANS type.
|
|
*/
|
|
void btrfs_qgroup_free_refroot(struct btrfs_fs_info *fs_info,
|
|
u64 ref_root, u64 num_bytes,
|
|
enum btrfs_qgroup_rsv_type type)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
int ret = 0;
|
|
|
|
if (!is_fstree(ref_root))
|
|
return;
|
|
|
|
if (num_bytes == 0)
|
|
return;
|
|
|
|
if (num_bytes == (u64)-1 && type != BTRFS_QGROUP_RSV_META_PERTRANS) {
|
|
WARN(1, "%s: Invalid type to free", __func__);
|
|
return;
|
|
}
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
|
|
if (!fs_info->quota_root)
|
|
goto out;
|
|
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
|
|
if (num_bytes == (u64)-1)
|
|
/*
|
|
* We're freeing all pertrans rsv, get reserved value from
|
|
* level 0 qgroup as real num_bytes to free.
|
|
*/
|
|
num_bytes = qgroup->rsv.values[type];
|
|
|
|
ulist_reinit(fs_info->qgroup_ulist);
|
|
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
|
|
qgroup_to_aux(qgroup), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = unode_aux_to_qgroup(unode);
|
|
|
|
qgroup_rsv_release(fs_info, qg, num_bytes, type);
|
|
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(fs_info->qgroup_ulist,
|
|
glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
}
|
|
|
|
/*
|
|
* Check if the leaf is the last leaf. Which means all node pointers
|
|
* are at their last position.
|
|
*/
|
|
static bool is_last_leaf(struct btrfs_path *path)
|
|
{
|
|
int i;
|
|
|
|
for (i = 1; i < BTRFS_MAX_LEVEL && path->nodes[i]; i++) {
|
|
if (path->slots[i] != btrfs_header_nritems(path->nodes[i]) - 1)
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* returns < 0 on error, 0 when more leafs are to be scanned.
|
|
* returns 1 when done.
|
|
*/
|
|
static int qgroup_rescan_leaf(struct btrfs_trans_handle *trans,
|
|
struct btrfs_path *path)
|
|
{
|
|
struct btrfs_fs_info *fs_info = trans->fs_info;
|
|
struct btrfs_root *extent_root;
|
|
struct btrfs_key found;
|
|
struct extent_buffer *scratch_leaf = NULL;
|
|
u64 num_bytes;
|
|
bool done;
|
|
int slot;
|
|
int ret;
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
extent_root = btrfs_extent_root(fs_info,
|
|
fs_info->qgroup_rescan_progress.objectid);
|
|
ret = btrfs_search_slot_for_read(extent_root,
|
|
&fs_info->qgroup_rescan_progress,
|
|
path, 1, 0);
|
|
|
|
btrfs_debug(fs_info,
|
|
"current progress key (%llu %u %llu), search_slot ret %d",
|
|
fs_info->qgroup_rescan_progress.objectid,
|
|
fs_info->qgroup_rescan_progress.type,
|
|
fs_info->qgroup_rescan_progress.offset, ret);
|
|
|
|
if (ret) {
|
|
/*
|
|
* The rescan is about to end, we will not be scanning any
|
|
* further blocks. We cannot unset the RESCAN flag here, because
|
|
* we want to commit the transaction if everything went well.
|
|
* To make the live accounting work in this phase, we set our
|
|
* scan progress pointer such that every real extent objectid
|
|
* will be smaller.
|
|
*/
|
|
fs_info->qgroup_rescan_progress.objectid = (u64)-1;
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
return ret;
|
|
}
|
|
done = is_last_leaf(path);
|
|
|
|
btrfs_item_key_to_cpu(path->nodes[0], &found,
|
|
btrfs_header_nritems(path->nodes[0]) - 1);
|
|
fs_info->qgroup_rescan_progress.objectid = found.objectid + 1;
|
|
|
|
scratch_leaf = btrfs_clone_extent_buffer(path->nodes[0]);
|
|
if (!scratch_leaf) {
|
|
ret = -ENOMEM;
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
goto out;
|
|
}
|
|
slot = path->slots[0];
|
|
btrfs_release_path(path);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
for (; slot < btrfs_header_nritems(scratch_leaf); ++slot) {
|
|
struct btrfs_backref_walk_ctx ctx = { 0 };
|
|
|
|
btrfs_item_key_to_cpu(scratch_leaf, &found, slot);
|
|
if (found.type != BTRFS_EXTENT_ITEM_KEY &&
|
|
found.type != BTRFS_METADATA_ITEM_KEY)
|
|
continue;
|
|
if (found.type == BTRFS_METADATA_ITEM_KEY)
|
|
num_bytes = fs_info->nodesize;
|
|
else
|
|
num_bytes = found.offset;
|
|
|
|
ctx.bytenr = found.objectid;
|
|
ctx.fs_info = fs_info;
|
|
|
|
ret = btrfs_find_all_roots(&ctx, false);
|
|
if (ret < 0)
|
|
goto out;
|
|
/* For rescan, just pass old_roots as NULL */
|
|
ret = btrfs_qgroup_account_extent(trans, found.objectid,
|
|
num_bytes, NULL, ctx.roots);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
out:
|
|
if (scratch_leaf)
|
|
free_extent_buffer(scratch_leaf);
|
|
|
|
if (done && !ret) {
|
|
ret = 1;
|
|
fs_info->qgroup_rescan_progress.objectid = (u64)-1;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static bool rescan_should_stop(struct btrfs_fs_info *fs_info)
|
|
{
|
|
return btrfs_fs_closing(fs_info) ||
|
|
test_bit(BTRFS_FS_STATE_REMOUNTING, &fs_info->fs_state) ||
|
|
!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
|
|
fs_info->qgroup_flags & BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN;
|
|
}
|
|
|
|
static void btrfs_qgroup_rescan_worker(struct btrfs_work *work)
|
|
{
|
|
struct btrfs_fs_info *fs_info = container_of(work, struct btrfs_fs_info,
|
|
qgroup_rescan_work);
|
|
struct btrfs_path *path;
|
|
struct btrfs_trans_handle *trans = NULL;
|
|
int err = -ENOMEM;
|
|
int ret = 0;
|
|
bool stopped = false;
|
|
bool did_leaf_rescans = false;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
goto out;
|
|
/*
|
|
* Rescan should only search for commit root, and any later difference
|
|
* should be recorded by qgroup
|
|
*/
|
|
path->search_commit_root = 1;
|
|
path->skip_locking = 1;
|
|
|
|
err = 0;
|
|
while (!err && !(stopped = rescan_should_stop(fs_info))) {
|
|
trans = btrfs_start_transaction(fs_info->fs_root, 0);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
break;
|
|
}
|
|
|
|
err = qgroup_rescan_leaf(trans, path);
|
|
did_leaf_rescans = true;
|
|
|
|
if (err > 0)
|
|
btrfs_commit_transaction(trans);
|
|
else
|
|
btrfs_end_transaction(trans);
|
|
}
|
|
|
|
out:
|
|
btrfs_free_path(path);
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
if (err > 0 &&
|
|
fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT) {
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
} else if (err < 0 || stopped) {
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_INCONSISTENT;
|
|
}
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
/*
|
|
* Only update status, since the previous part has already updated the
|
|
* qgroup info, and only if we did any actual work. This also prevents
|
|
* race with a concurrent quota disable, which has already set
|
|
* fs_info->quota_root to NULL and cleared BTRFS_FS_QUOTA_ENABLED at
|
|
* btrfs_quota_disable().
|
|
*/
|
|
if (did_leaf_rescans) {
|
|
trans = btrfs_start_transaction(fs_info->quota_root, 1);
|
|
if (IS_ERR(trans)) {
|
|
err = PTR_ERR(trans);
|
|
trans = NULL;
|
|
btrfs_err(fs_info,
|
|
"fail to start transaction for status update: %d",
|
|
err);
|
|
}
|
|
} else {
|
|
trans = NULL;
|
|
}
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
if (!stopped ||
|
|
fs_info->qgroup_flags & BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN)
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
if (trans) {
|
|
ret = update_qgroup_status_item(trans);
|
|
if (ret < 0) {
|
|
err = ret;
|
|
btrfs_err(fs_info, "fail to update qgroup status: %d",
|
|
err);
|
|
}
|
|
}
|
|
fs_info->qgroup_rescan_running = false;
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN;
|
|
complete_all(&fs_info->qgroup_rescan_completion);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
if (!trans)
|
|
return;
|
|
|
|
btrfs_end_transaction(trans);
|
|
|
|
if (stopped) {
|
|
btrfs_info(fs_info, "qgroup scan paused");
|
|
} else if (fs_info->qgroup_flags & BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN) {
|
|
btrfs_info(fs_info, "qgroup scan cancelled");
|
|
} else if (err >= 0) {
|
|
btrfs_info(fs_info, "qgroup scan completed%s",
|
|
err > 0 ? " (inconsistency flag cleared)" : "");
|
|
} else {
|
|
btrfs_err(fs_info, "qgroup scan failed with %d", err);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Checks that (a) no rescan is running and (b) quota is enabled. Allocates all
|
|
* memory required for the rescan context.
|
|
*/
|
|
static int
|
|
qgroup_rescan_init(struct btrfs_fs_info *fs_info, u64 progress_objectid,
|
|
int init_flags)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (!init_flags) {
|
|
/* we're resuming qgroup rescan at mount time */
|
|
if (!(fs_info->qgroup_flags &
|
|
BTRFS_QGROUP_STATUS_FLAG_RESCAN)) {
|
|
btrfs_warn(fs_info,
|
|
"qgroup rescan init failed, qgroup rescan is not queued");
|
|
ret = -EINVAL;
|
|
} else if (!(fs_info->qgroup_flags &
|
|
BTRFS_QGROUP_STATUS_FLAG_ON)) {
|
|
btrfs_warn(fs_info,
|
|
"qgroup rescan init failed, qgroup is not enabled");
|
|
ret = -EINVAL;
|
|
}
|
|
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
|
|
if (init_flags) {
|
|
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
|
|
btrfs_warn(fs_info,
|
|
"qgroup rescan is already in progress");
|
|
ret = -EINPROGRESS;
|
|
} else if (!(fs_info->qgroup_flags &
|
|
BTRFS_QGROUP_STATUS_FLAG_ON)) {
|
|
btrfs_warn(fs_info,
|
|
"qgroup rescan init failed, qgroup is not enabled");
|
|
ret = -EINVAL;
|
|
} else if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags)) {
|
|
/* Quota disable is in progress */
|
|
ret = -EBUSY;
|
|
}
|
|
|
|
if (ret) {
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
return ret;
|
|
}
|
|
fs_info->qgroup_flags |= BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
}
|
|
|
|
memset(&fs_info->qgroup_rescan_progress, 0,
|
|
sizeof(fs_info->qgroup_rescan_progress));
|
|
fs_info->qgroup_flags &= ~(BTRFS_QGROUP_RUNTIME_FLAG_CANCEL_RESCAN |
|
|
BTRFS_QGROUP_RUNTIME_FLAG_NO_ACCOUNTING);
|
|
fs_info->qgroup_rescan_progress.objectid = progress_objectid;
|
|
init_completion(&fs_info->qgroup_rescan_completion);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
btrfs_init_work(&fs_info->qgroup_rescan_work,
|
|
btrfs_qgroup_rescan_worker, NULL, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
qgroup_rescan_zero_tracking(struct btrfs_fs_info *fs_info)
|
|
{
|
|
struct rb_node *n;
|
|
struct btrfs_qgroup *qgroup;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
/* clear all current qgroup tracking information */
|
|
for (n = rb_first(&fs_info->qgroup_tree); n; n = rb_next(n)) {
|
|
qgroup = rb_entry(n, struct btrfs_qgroup, node);
|
|
qgroup->rfer = 0;
|
|
qgroup->rfer_cmpr = 0;
|
|
qgroup->excl = 0;
|
|
qgroup->excl_cmpr = 0;
|
|
qgroup_dirty(fs_info, qgroup);
|
|
}
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
}
|
|
|
|
int
|
|
btrfs_qgroup_rescan(struct btrfs_fs_info *fs_info)
|
|
{
|
|
int ret = 0;
|
|
struct btrfs_trans_handle *trans;
|
|
|
|
ret = qgroup_rescan_init(fs_info, 0, 1);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* We have set the rescan_progress to 0, which means no more
|
|
* delayed refs will be accounted by btrfs_qgroup_account_ref.
|
|
* However, btrfs_qgroup_account_ref may be right after its call
|
|
* to btrfs_find_all_roots, in which case it would still do the
|
|
* accounting.
|
|
* To solve this, we're committing the transaction, which will
|
|
* ensure we run all delayed refs and only after that, we are
|
|
* going to clear all tracking information for a clean start.
|
|
*/
|
|
|
|
trans = btrfs_join_transaction(fs_info->fs_root);
|
|
if (IS_ERR(trans)) {
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
return PTR_ERR(trans);
|
|
}
|
|
ret = btrfs_commit_transaction(trans);
|
|
if (ret) {
|
|
fs_info->qgroup_flags &= ~BTRFS_QGROUP_STATUS_FLAG_RESCAN;
|
|
return ret;
|
|
}
|
|
|
|
qgroup_rescan_zero_tracking(fs_info);
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
fs_info->qgroup_rescan_running = true;
|
|
btrfs_queue_work(fs_info->qgroup_rescan_workers,
|
|
&fs_info->qgroup_rescan_work);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int btrfs_qgroup_wait_for_completion(struct btrfs_fs_info *fs_info,
|
|
bool interruptible)
|
|
{
|
|
int running;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
running = fs_info->qgroup_rescan_running;
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
|
|
if (!running)
|
|
return 0;
|
|
|
|
if (interruptible)
|
|
ret = wait_for_completion_interruptible(
|
|
&fs_info->qgroup_rescan_completion);
|
|
else
|
|
wait_for_completion(&fs_info->qgroup_rescan_completion);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* this is only called from open_ctree where we're still single threaded, thus
|
|
* locking is omitted here.
|
|
*/
|
|
void
|
|
btrfs_qgroup_rescan_resume(struct btrfs_fs_info *fs_info)
|
|
{
|
|
if (fs_info->qgroup_flags & BTRFS_QGROUP_STATUS_FLAG_RESCAN) {
|
|
mutex_lock(&fs_info->qgroup_rescan_lock);
|
|
fs_info->qgroup_rescan_running = true;
|
|
btrfs_queue_work(fs_info->qgroup_rescan_workers,
|
|
&fs_info->qgroup_rescan_work);
|
|
mutex_unlock(&fs_info->qgroup_rescan_lock);
|
|
}
|
|
}
|
|
|
|
#define rbtree_iterate_from_safe(node, next, start) \
|
|
for (node = start; node && ({ next = rb_next(node); 1;}); node = next)
|
|
|
|
static int qgroup_unreserve_range(struct btrfs_inode *inode,
|
|
struct extent_changeset *reserved, u64 start,
|
|
u64 len)
|
|
{
|
|
struct rb_node *node;
|
|
struct rb_node *next;
|
|
struct ulist_node *entry;
|
|
int ret = 0;
|
|
|
|
node = reserved->range_changed.root.rb_node;
|
|
if (!node)
|
|
return 0;
|
|
while (node) {
|
|
entry = rb_entry(node, struct ulist_node, rb_node);
|
|
if (entry->val < start)
|
|
node = node->rb_right;
|
|
else
|
|
node = node->rb_left;
|
|
}
|
|
|
|
if (entry->val > start && rb_prev(&entry->rb_node))
|
|
entry = rb_entry(rb_prev(&entry->rb_node), struct ulist_node,
|
|
rb_node);
|
|
|
|
rbtree_iterate_from_safe(node, next, &entry->rb_node) {
|
|
u64 entry_start;
|
|
u64 entry_end;
|
|
u64 entry_len;
|
|
int clear_ret;
|
|
|
|
entry = rb_entry(node, struct ulist_node, rb_node);
|
|
entry_start = entry->val;
|
|
entry_end = entry->aux;
|
|
entry_len = entry_end - entry_start + 1;
|
|
|
|
if (entry_start >= start + len)
|
|
break;
|
|
if (entry_start + entry_len <= start)
|
|
continue;
|
|
/*
|
|
* Now the entry is in [start, start + len), revert the
|
|
* EXTENT_QGROUP_RESERVED bit.
|
|
*/
|
|
clear_ret = clear_extent_bits(&inode->io_tree, entry_start,
|
|
entry_end, EXTENT_QGROUP_RESERVED);
|
|
if (!ret && clear_ret < 0)
|
|
ret = clear_ret;
|
|
|
|
ulist_del(&reserved->range_changed, entry->val, entry->aux);
|
|
if (likely(reserved->bytes_changed >= entry_len)) {
|
|
reserved->bytes_changed -= entry_len;
|
|
} else {
|
|
WARN_ON(1);
|
|
reserved->bytes_changed = 0;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Try to free some space for qgroup.
|
|
*
|
|
* For qgroup, there are only 3 ways to free qgroup space:
|
|
* - Flush nodatacow write
|
|
* Any nodatacow write will free its reserved data space at run_delalloc_range().
|
|
* In theory, we should only flush nodatacow inodes, but it's not yet
|
|
* possible, so we need to flush the whole root.
|
|
*
|
|
* - Wait for ordered extents
|
|
* When ordered extents are finished, their reserved metadata is finally
|
|
* converted to per_trans status, which can be freed by later commit
|
|
* transaction.
|
|
*
|
|
* - Commit transaction
|
|
* This would free the meta_per_trans space.
|
|
* In theory this shouldn't provide much space, but any more qgroup space
|
|
* is needed.
|
|
*/
|
|
static int try_flush_qgroup(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
int ret;
|
|
|
|
/* Can't hold an open transaction or we run the risk of deadlocking. */
|
|
ASSERT(current->journal_info == NULL);
|
|
if (WARN_ON(current->journal_info))
|
|
return 0;
|
|
|
|
/*
|
|
* We don't want to run flush again and again, so if there is a running
|
|
* one, we won't try to start a new flush, but exit directly.
|
|
*/
|
|
if (test_and_set_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state)) {
|
|
wait_event(root->qgroup_flush_wait,
|
|
!test_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state));
|
|
return 0;
|
|
}
|
|
|
|
ret = btrfs_start_delalloc_snapshot(root, true);
|
|
if (ret < 0)
|
|
goto out;
|
|
btrfs_wait_ordered_extents(root, U64_MAX, 0, (u64)-1);
|
|
|
|
trans = btrfs_join_transaction(root);
|
|
if (IS_ERR(trans)) {
|
|
ret = PTR_ERR(trans);
|
|
goto out;
|
|
}
|
|
|
|
ret = btrfs_commit_transaction(trans);
|
|
out:
|
|
clear_bit(BTRFS_ROOT_QGROUP_FLUSHING, &root->state);
|
|
wake_up(&root->qgroup_flush_wait);
|
|
return ret;
|
|
}
|
|
|
|
static int qgroup_reserve_data(struct btrfs_inode *inode,
|
|
struct extent_changeset **reserved_ret, u64 start,
|
|
u64 len)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct extent_changeset *reserved;
|
|
bool new_reserved = false;
|
|
u64 orig_reserved;
|
|
u64 to_reserve;
|
|
int ret;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &root->fs_info->flags) ||
|
|
!is_fstree(root->root_key.objectid) || len == 0)
|
|
return 0;
|
|
|
|
/* @reserved parameter is mandatory for qgroup */
|
|
if (WARN_ON(!reserved_ret))
|
|
return -EINVAL;
|
|
if (!*reserved_ret) {
|
|
new_reserved = true;
|
|
*reserved_ret = extent_changeset_alloc();
|
|
if (!*reserved_ret)
|
|
return -ENOMEM;
|
|
}
|
|
reserved = *reserved_ret;
|
|
/* Record already reserved space */
|
|
orig_reserved = reserved->bytes_changed;
|
|
ret = set_record_extent_bits(&inode->io_tree, start,
|
|
start + len -1, EXTENT_QGROUP_RESERVED, reserved);
|
|
|
|
/* Newly reserved space */
|
|
to_reserve = reserved->bytes_changed - orig_reserved;
|
|
trace_btrfs_qgroup_reserve_data(&inode->vfs_inode, start, len,
|
|
to_reserve, QGROUP_RESERVE);
|
|
if (ret < 0)
|
|
goto out;
|
|
ret = qgroup_reserve(root, to_reserve, true, BTRFS_QGROUP_RSV_DATA);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
|
|
return ret;
|
|
|
|
cleanup:
|
|
qgroup_unreserve_range(inode, reserved, start, len);
|
|
out:
|
|
if (new_reserved) {
|
|
extent_changeset_free(reserved);
|
|
*reserved_ret = NULL;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Reserve qgroup space for range [start, start + len).
|
|
*
|
|
* This function will either reserve space from related qgroups or do nothing
|
|
* if the range is already reserved.
|
|
*
|
|
* Return 0 for successful reservation
|
|
* Return <0 for error (including -EQUOT)
|
|
*
|
|
* NOTE: This function may sleep for memory allocation, dirty page flushing and
|
|
* commit transaction. So caller should not hold any dirty page locked.
|
|
*/
|
|
int btrfs_qgroup_reserve_data(struct btrfs_inode *inode,
|
|
struct extent_changeset **reserved_ret, u64 start,
|
|
u64 len)
|
|
{
|
|
int ret;
|
|
|
|
ret = qgroup_reserve_data(inode, reserved_ret, start, len);
|
|
if (ret <= 0 && ret != -EDQUOT)
|
|
return ret;
|
|
|
|
ret = try_flush_qgroup(inode->root);
|
|
if (ret < 0)
|
|
return ret;
|
|
return qgroup_reserve_data(inode, reserved_ret, start, len);
|
|
}
|
|
|
|
/* Free ranges specified by @reserved, normally in error path */
|
|
static int qgroup_free_reserved_data(struct btrfs_inode *inode,
|
|
struct extent_changeset *reserved, u64 start, u64 len)
|
|
{
|
|
struct btrfs_root *root = inode->root;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
struct extent_changeset changeset;
|
|
int freed = 0;
|
|
int ret;
|
|
|
|
extent_changeset_init(&changeset);
|
|
len = round_up(start + len, root->fs_info->sectorsize);
|
|
start = round_down(start, root->fs_info->sectorsize);
|
|
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(&reserved->range_changed, &uiter))) {
|
|
u64 range_start = unode->val;
|
|
/* unode->aux is the inclusive end */
|
|
u64 range_len = unode->aux - range_start + 1;
|
|
u64 free_start;
|
|
u64 free_len;
|
|
|
|
extent_changeset_release(&changeset);
|
|
|
|
/* Only free range in range [start, start + len) */
|
|
if (range_start >= start + len ||
|
|
range_start + range_len <= start)
|
|
continue;
|
|
free_start = max(range_start, start);
|
|
free_len = min(start + len, range_start + range_len) -
|
|
free_start;
|
|
/*
|
|
* TODO: To also modify reserved->ranges_reserved to reflect
|
|
* the modification.
|
|
*
|
|
* However as long as we free qgroup reserved according to
|
|
* EXTENT_QGROUP_RESERVED, we won't double free.
|
|
* So not need to rush.
|
|
*/
|
|
ret = clear_record_extent_bits(&inode->io_tree, free_start,
|
|
free_start + free_len - 1,
|
|
EXTENT_QGROUP_RESERVED, &changeset);
|
|
if (ret < 0)
|
|
goto out;
|
|
freed += changeset.bytes_changed;
|
|
}
|
|
btrfs_qgroup_free_refroot(root->fs_info, root->root_key.objectid, freed,
|
|
BTRFS_QGROUP_RSV_DATA);
|
|
ret = freed;
|
|
out:
|
|
extent_changeset_release(&changeset);
|
|
return ret;
|
|
}
|
|
|
|
static int __btrfs_qgroup_release_data(struct btrfs_inode *inode,
|
|
struct extent_changeset *reserved, u64 start, u64 len,
|
|
int free)
|
|
{
|
|
struct extent_changeset changeset;
|
|
int trace_op = QGROUP_RELEASE;
|
|
int ret;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &inode->root->fs_info->flags))
|
|
return 0;
|
|
|
|
/* In release case, we shouldn't have @reserved */
|
|
WARN_ON(!free && reserved);
|
|
if (free && reserved)
|
|
return qgroup_free_reserved_data(inode, reserved, start, len);
|
|
extent_changeset_init(&changeset);
|
|
ret = clear_record_extent_bits(&inode->io_tree, start, start + len -1,
|
|
EXTENT_QGROUP_RESERVED, &changeset);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
if (free)
|
|
trace_op = QGROUP_FREE;
|
|
trace_btrfs_qgroup_release_data(&inode->vfs_inode, start, len,
|
|
changeset.bytes_changed, trace_op);
|
|
if (free)
|
|
btrfs_qgroup_free_refroot(inode->root->fs_info,
|
|
inode->root->root_key.objectid,
|
|
changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
|
|
ret = changeset.bytes_changed;
|
|
out:
|
|
extent_changeset_release(&changeset);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Free a reserved space range from io_tree and related qgroups
|
|
*
|
|
* Should be called when a range of pages get invalidated before reaching disk.
|
|
* Or for error cleanup case.
|
|
* if @reserved is given, only reserved range in [@start, @start + @len) will
|
|
* be freed.
|
|
*
|
|
* For data written to disk, use btrfs_qgroup_release_data().
|
|
*
|
|
* NOTE: This function may sleep for memory allocation.
|
|
*/
|
|
int btrfs_qgroup_free_data(struct btrfs_inode *inode,
|
|
struct extent_changeset *reserved, u64 start, u64 len)
|
|
{
|
|
return __btrfs_qgroup_release_data(inode, reserved, start, len, 1);
|
|
}
|
|
|
|
/*
|
|
* Release a reserved space range from io_tree only.
|
|
*
|
|
* Should be called when a range of pages get written to disk and corresponding
|
|
* FILE_EXTENT is inserted into corresponding root.
|
|
*
|
|
* Since new qgroup accounting framework will only update qgroup numbers at
|
|
* commit_transaction() time, its reserved space shouldn't be freed from
|
|
* related qgroups.
|
|
*
|
|
* But we should release the range from io_tree, to allow further write to be
|
|
* COWed.
|
|
*
|
|
* NOTE: This function may sleep for memory allocation.
|
|
*/
|
|
int btrfs_qgroup_release_data(struct btrfs_inode *inode, u64 start, u64 len)
|
|
{
|
|
return __btrfs_qgroup_release_data(inode, NULL, start, len, 0);
|
|
}
|
|
|
|
static void add_root_meta_rsv(struct btrfs_root *root, int num_bytes,
|
|
enum btrfs_qgroup_rsv_type type)
|
|
{
|
|
if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
|
|
type != BTRFS_QGROUP_RSV_META_PERTRANS)
|
|
return;
|
|
if (num_bytes == 0)
|
|
return;
|
|
|
|
spin_lock(&root->qgroup_meta_rsv_lock);
|
|
if (type == BTRFS_QGROUP_RSV_META_PREALLOC)
|
|
root->qgroup_meta_rsv_prealloc += num_bytes;
|
|
else
|
|
root->qgroup_meta_rsv_pertrans += num_bytes;
|
|
spin_unlock(&root->qgroup_meta_rsv_lock);
|
|
}
|
|
|
|
static int sub_root_meta_rsv(struct btrfs_root *root, int num_bytes,
|
|
enum btrfs_qgroup_rsv_type type)
|
|
{
|
|
if (type != BTRFS_QGROUP_RSV_META_PREALLOC &&
|
|
type != BTRFS_QGROUP_RSV_META_PERTRANS)
|
|
return 0;
|
|
if (num_bytes == 0)
|
|
return 0;
|
|
|
|
spin_lock(&root->qgroup_meta_rsv_lock);
|
|
if (type == BTRFS_QGROUP_RSV_META_PREALLOC) {
|
|
num_bytes = min_t(u64, root->qgroup_meta_rsv_prealloc,
|
|
num_bytes);
|
|
root->qgroup_meta_rsv_prealloc -= num_bytes;
|
|
} else {
|
|
num_bytes = min_t(u64, root->qgroup_meta_rsv_pertrans,
|
|
num_bytes);
|
|
root->qgroup_meta_rsv_pertrans -= num_bytes;
|
|
}
|
|
spin_unlock(&root->qgroup_meta_rsv_lock);
|
|
return num_bytes;
|
|
}
|
|
|
|
int btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
|
|
enum btrfs_qgroup_rsv_type type, bool enforce)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
int ret;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
|
|
!is_fstree(root->root_key.objectid) || num_bytes == 0)
|
|
return 0;
|
|
|
|
BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
|
|
trace_qgroup_meta_reserve(root, (s64)num_bytes, type);
|
|
ret = qgroup_reserve(root, num_bytes, enforce, type);
|
|
if (ret < 0)
|
|
return ret;
|
|
/*
|
|
* Record what we have reserved into root.
|
|
*
|
|
* To avoid quota disabled->enabled underflow.
|
|
* In that case, we may try to free space we haven't reserved
|
|
* (since quota was disabled), so record what we reserved into root.
|
|
* And ensure later release won't underflow this number.
|
|
*/
|
|
add_root_meta_rsv(root, num_bytes, type);
|
|
return ret;
|
|
}
|
|
|
|
int __btrfs_qgroup_reserve_meta(struct btrfs_root *root, int num_bytes,
|
|
enum btrfs_qgroup_rsv_type type, bool enforce,
|
|
bool noflush)
|
|
{
|
|
int ret;
|
|
|
|
ret = btrfs_qgroup_reserve_meta(root, num_bytes, type, enforce);
|
|
if ((ret <= 0 && ret != -EDQUOT) || noflush)
|
|
return ret;
|
|
|
|
ret = try_flush_qgroup(root);
|
|
if (ret < 0)
|
|
return ret;
|
|
return btrfs_qgroup_reserve_meta(root, num_bytes, type, enforce);
|
|
}
|
|
|
|
void btrfs_qgroup_free_meta_all_pertrans(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
|
|
!is_fstree(root->root_key.objectid))
|
|
return;
|
|
|
|
/* TODO: Update trace point to handle such free */
|
|
trace_qgroup_meta_free_all_pertrans(root);
|
|
/* Special value -1 means to free all reserved space */
|
|
btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid, (u64)-1,
|
|
BTRFS_QGROUP_RSV_META_PERTRANS);
|
|
}
|
|
|
|
void __btrfs_qgroup_free_meta(struct btrfs_root *root, int num_bytes,
|
|
enum btrfs_qgroup_rsv_type type)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
|
|
!is_fstree(root->root_key.objectid))
|
|
return;
|
|
|
|
/*
|
|
* reservation for META_PREALLOC can happen before quota is enabled,
|
|
* which can lead to underflow.
|
|
* Here ensure we will only free what we really have reserved.
|
|
*/
|
|
num_bytes = sub_root_meta_rsv(root, num_bytes, type);
|
|
BUG_ON(num_bytes != round_down(num_bytes, fs_info->nodesize));
|
|
trace_qgroup_meta_reserve(root, -(s64)num_bytes, type);
|
|
btrfs_qgroup_free_refroot(fs_info, root->root_key.objectid,
|
|
num_bytes, type);
|
|
}
|
|
|
|
static void qgroup_convert_meta(struct btrfs_fs_info *fs_info, u64 ref_root,
|
|
int num_bytes)
|
|
{
|
|
struct btrfs_qgroup *qgroup;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator uiter;
|
|
int ret = 0;
|
|
|
|
if (num_bytes == 0)
|
|
return;
|
|
if (!fs_info->quota_root)
|
|
return;
|
|
|
|
spin_lock(&fs_info->qgroup_lock);
|
|
qgroup = find_qgroup_rb(fs_info, ref_root);
|
|
if (!qgroup)
|
|
goto out;
|
|
ulist_reinit(fs_info->qgroup_ulist);
|
|
ret = ulist_add(fs_info->qgroup_ulist, qgroup->qgroupid,
|
|
qgroup_to_aux(qgroup), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
ULIST_ITER_INIT(&uiter);
|
|
while ((unode = ulist_next(fs_info->qgroup_ulist, &uiter))) {
|
|
struct btrfs_qgroup *qg;
|
|
struct btrfs_qgroup_list *glist;
|
|
|
|
qg = unode_aux_to_qgroup(unode);
|
|
|
|
qgroup_rsv_release(fs_info, qg, num_bytes,
|
|
BTRFS_QGROUP_RSV_META_PREALLOC);
|
|
qgroup_rsv_add(fs_info, qg, num_bytes,
|
|
BTRFS_QGROUP_RSV_META_PERTRANS);
|
|
list_for_each_entry(glist, &qg->groups, next_group) {
|
|
ret = ulist_add(fs_info->qgroup_ulist,
|
|
glist->group->qgroupid,
|
|
qgroup_to_aux(glist->group), GFP_ATOMIC);
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
}
|
|
out:
|
|
spin_unlock(&fs_info->qgroup_lock);
|
|
}
|
|
|
|
void btrfs_qgroup_convert_reserved_meta(struct btrfs_root *root, int num_bytes)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags) ||
|
|
!is_fstree(root->root_key.objectid))
|
|
return;
|
|
/* Same as btrfs_qgroup_free_meta_prealloc() */
|
|
num_bytes = sub_root_meta_rsv(root, num_bytes,
|
|
BTRFS_QGROUP_RSV_META_PREALLOC);
|
|
trace_qgroup_meta_convert(root, num_bytes);
|
|
qgroup_convert_meta(fs_info, root->root_key.objectid, num_bytes);
|
|
}
|
|
|
|
/*
|
|
* Check qgroup reserved space leaking, normally at destroy inode
|
|
* time
|
|
*/
|
|
void btrfs_qgroup_check_reserved_leak(struct btrfs_inode *inode)
|
|
{
|
|
struct extent_changeset changeset;
|
|
struct ulist_node *unode;
|
|
struct ulist_iterator iter;
|
|
int ret;
|
|
|
|
extent_changeset_init(&changeset);
|
|
ret = clear_record_extent_bits(&inode->io_tree, 0, (u64)-1,
|
|
EXTENT_QGROUP_RESERVED, &changeset);
|
|
|
|
WARN_ON(ret < 0);
|
|
if (WARN_ON(changeset.bytes_changed)) {
|
|
ULIST_ITER_INIT(&iter);
|
|
while ((unode = ulist_next(&changeset.range_changed, &iter))) {
|
|
btrfs_warn(inode->root->fs_info,
|
|
"leaking qgroup reserved space, ino: %llu, start: %llu, end: %llu",
|
|
btrfs_ino(inode), unode->val, unode->aux);
|
|
}
|
|
btrfs_qgroup_free_refroot(inode->root->fs_info,
|
|
inode->root->root_key.objectid,
|
|
changeset.bytes_changed, BTRFS_QGROUP_RSV_DATA);
|
|
|
|
}
|
|
extent_changeset_release(&changeset);
|
|
}
|
|
|
|
void btrfs_qgroup_init_swapped_blocks(
|
|
struct btrfs_qgroup_swapped_blocks *swapped_blocks)
|
|
{
|
|
int i;
|
|
|
|
spin_lock_init(&swapped_blocks->lock);
|
|
for (i = 0; i < BTRFS_MAX_LEVEL; i++)
|
|
swapped_blocks->blocks[i] = RB_ROOT;
|
|
swapped_blocks->swapped = false;
|
|
}
|
|
|
|
/*
|
|
* Delete all swapped blocks record of @root.
|
|
* Every record here means we skipped a full subtree scan for qgroup.
|
|
*
|
|
* Gets called when committing one transaction.
|
|
*/
|
|
void btrfs_qgroup_clean_swapped_blocks(struct btrfs_root *root)
|
|
{
|
|
struct btrfs_qgroup_swapped_blocks *swapped_blocks;
|
|
int i;
|
|
|
|
swapped_blocks = &root->swapped_blocks;
|
|
|
|
spin_lock(&swapped_blocks->lock);
|
|
if (!swapped_blocks->swapped)
|
|
goto out;
|
|
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
|
|
struct rb_root *cur_root = &swapped_blocks->blocks[i];
|
|
struct btrfs_qgroup_swapped_block *entry;
|
|
struct btrfs_qgroup_swapped_block *next;
|
|
|
|
rbtree_postorder_for_each_entry_safe(entry, next, cur_root,
|
|
node)
|
|
kfree(entry);
|
|
swapped_blocks->blocks[i] = RB_ROOT;
|
|
}
|
|
swapped_blocks->swapped = false;
|
|
out:
|
|
spin_unlock(&swapped_blocks->lock);
|
|
}
|
|
|
|
/*
|
|
* Add subtree roots record into @subvol_root.
|
|
*
|
|
* @subvol_root: tree root of the subvolume tree get swapped
|
|
* @bg: block group under balance
|
|
* @subvol_parent/slot: pointer to the subtree root in subvolume tree
|
|
* @reloc_parent/slot: pointer to the subtree root in reloc tree
|
|
* BOTH POINTERS ARE BEFORE TREE SWAP
|
|
* @last_snapshot: last snapshot generation of the subvolume tree
|
|
*/
|
|
int btrfs_qgroup_add_swapped_blocks(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *subvol_root,
|
|
struct btrfs_block_group *bg,
|
|
struct extent_buffer *subvol_parent, int subvol_slot,
|
|
struct extent_buffer *reloc_parent, int reloc_slot,
|
|
u64 last_snapshot)
|
|
{
|
|
struct btrfs_fs_info *fs_info = subvol_root->fs_info;
|
|
struct btrfs_qgroup_swapped_blocks *blocks = &subvol_root->swapped_blocks;
|
|
struct btrfs_qgroup_swapped_block *block;
|
|
struct rb_node **cur;
|
|
struct rb_node *parent = NULL;
|
|
int level = btrfs_header_level(subvol_parent) - 1;
|
|
int ret = 0;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
return 0;
|
|
|
|
if (btrfs_node_ptr_generation(subvol_parent, subvol_slot) >
|
|
btrfs_node_ptr_generation(reloc_parent, reloc_slot)) {
|
|
btrfs_err_rl(fs_info,
|
|
"%s: bad parameter order, subvol_gen=%llu reloc_gen=%llu",
|
|
__func__,
|
|
btrfs_node_ptr_generation(subvol_parent, subvol_slot),
|
|
btrfs_node_ptr_generation(reloc_parent, reloc_slot));
|
|
return -EUCLEAN;
|
|
}
|
|
|
|
block = kmalloc(sizeof(*block), GFP_NOFS);
|
|
if (!block) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* @reloc_parent/slot is still before swap, while @block is going to
|
|
* record the bytenr after swap, so we do the swap here.
|
|
*/
|
|
block->subvol_bytenr = btrfs_node_blockptr(reloc_parent, reloc_slot);
|
|
block->subvol_generation = btrfs_node_ptr_generation(reloc_parent,
|
|
reloc_slot);
|
|
block->reloc_bytenr = btrfs_node_blockptr(subvol_parent, subvol_slot);
|
|
block->reloc_generation = btrfs_node_ptr_generation(subvol_parent,
|
|
subvol_slot);
|
|
block->last_snapshot = last_snapshot;
|
|
block->level = level;
|
|
|
|
/*
|
|
* If we have bg == NULL, we're called from btrfs_recover_relocation(),
|
|
* no one else can modify tree blocks thus we qgroup will not change
|
|
* no matter the value of trace_leaf.
|
|
*/
|
|
if (bg && bg->flags & BTRFS_BLOCK_GROUP_DATA)
|
|
block->trace_leaf = true;
|
|
else
|
|
block->trace_leaf = false;
|
|
btrfs_node_key_to_cpu(reloc_parent, &block->first_key, reloc_slot);
|
|
|
|
/* Insert @block into @blocks */
|
|
spin_lock(&blocks->lock);
|
|
cur = &blocks->blocks[level].rb_node;
|
|
while (*cur) {
|
|
struct btrfs_qgroup_swapped_block *entry;
|
|
|
|
parent = *cur;
|
|
entry = rb_entry(parent, struct btrfs_qgroup_swapped_block,
|
|
node);
|
|
|
|
if (entry->subvol_bytenr < block->subvol_bytenr) {
|
|
cur = &(*cur)->rb_left;
|
|
} else if (entry->subvol_bytenr > block->subvol_bytenr) {
|
|
cur = &(*cur)->rb_right;
|
|
} else {
|
|
if (entry->subvol_generation !=
|
|
block->subvol_generation ||
|
|
entry->reloc_bytenr != block->reloc_bytenr ||
|
|
entry->reloc_generation !=
|
|
block->reloc_generation) {
|
|
/*
|
|
* Duplicated but mismatch entry found.
|
|
* Shouldn't happen.
|
|
*
|
|
* Marking qgroup inconsistent should be enough
|
|
* for end users.
|
|
*/
|
|
WARN_ON(IS_ENABLED(CONFIG_BTRFS_DEBUG));
|
|
ret = -EEXIST;
|
|
}
|
|
kfree(block);
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
rb_link_node(&block->node, parent, cur);
|
|
rb_insert_color(&block->node, &blocks->blocks[level]);
|
|
blocks->swapped = true;
|
|
out_unlock:
|
|
spin_unlock(&blocks->lock);
|
|
out:
|
|
if (ret < 0)
|
|
qgroup_mark_inconsistent(fs_info);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Check if the tree block is a subtree root, and if so do the needed
|
|
* delayed subtree trace for qgroup.
|
|
*
|
|
* This is called during btrfs_cow_block().
|
|
*/
|
|
int btrfs_qgroup_trace_subtree_after_cow(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root,
|
|
struct extent_buffer *subvol_eb)
|
|
{
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_tree_parent_check check = { 0 };
|
|
struct btrfs_qgroup_swapped_blocks *blocks = &root->swapped_blocks;
|
|
struct btrfs_qgroup_swapped_block *block;
|
|
struct extent_buffer *reloc_eb = NULL;
|
|
struct rb_node *node;
|
|
bool found = false;
|
|
bool swapped = false;
|
|
int level = btrfs_header_level(subvol_eb);
|
|
int ret = 0;
|
|
int i;
|
|
|
|
if (!test_bit(BTRFS_FS_QUOTA_ENABLED, &fs_info->flags))
|
|
return 0;
|
|
if (!is_fstree(root->root_key.objectid) || !root->reloc_root)
|
|
return 0;
|
|
|
|
spin_lock(&blocks->lock);
|
|
if (!blocks->swapped) {
|
|
spin_unlock(&blocks->lock);
|
|
return 0;
|
|
}
|
|
node = blocks->blocks[level].rb_node;
|
|
|
|
while (node) {
|
|
block = rb_entry(node, struct btrfs_qgroup_swapped_block, node);
|
|
if (block->subvol_bytenr < subvol_eb->start) {
|
|
node = node->rb_left;
|
|
} else if (block->subvol_bytenr > subvol_eb->start) {
|
|
node = node->rb_right;
|
|
} else {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found) {
|
|
spin_unlock(&blocks->lock);
|
|
goto out;
|
|
}
|
|
/* Found one, remove it from @blocks first and update blocks->swapped */
|
|
rb_erase(&block->node, &blocks->blocks[level]);
|
|
for (i = 0; i < BTRFS_MAX_LEVEL; i++) {
|
|
if (RB_EMPTY_ROOT(&blocks->blocks[i])) {
|
|
swapped = true;
|
|
break;
|
|
}
|
|
}
|
|
blocks->swapped = swapped;
|
|
spin_unlock(&blocks->lock);
|
|
|
|
check.level = block->level;
|
|
check.transid = block->reloc_generation;
|
|
check.has_first_key = true;
|
|
memcpy(&check.first_key, &block->first_key, sizeof(check.first_key));
|
|
|
|
/* Read out reloc subtree root */
|
|
reloc_eb = read_tree_block(fs_info, block->reloc_bytenr, &check);
|
|
if (IS_ERR(reloc_eb)) {
|
|
ret = PTR_ERR(reloc_eb);
|
|
reloc_eb = NULL;
|
|
goto free_out;
|
|
}
|
|
if (!extent_buffer_uptodate(reloc_eb)) {
|
|
ret = -EIO;
|
|
goto free_out;
|
|
}
|
|
|
|
ret = qgroup_trace_subtree_swap(trans, reloc_eb, subvol_eb,
|
|
block->last_snapshot, block->trace_leaf);
|
|
free_out:
|
|
kfree(block);
|
|
free_extent_buffer(reloc_eb);
|
|
out:
|
|
if (ret < 0) {
|
|
btrfs_err_rl(fs_info,
|
|
"failed to account subtree at bytenr %llu: %d",
|
|
subvol_eb->start, ret);
|
|
qgroup_mark_inconsistent(fs_info);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void btrfs_qgroup_destroy_extent_records(struct btrfs_transaction *trans)
|
|
{
|
|
struct btrfs_qgroup_extent_record *entry;
|
|
struct btrfs_qgroup_extent_record *next;
|
|
struct rb_root *root;
|
|
|
|
root = &trans->delayed_refs.dirty_extent_root;
|
|
rbtree_postorder_for_each_entry_safe(entry, next, root, node) {
|
|
ulist_free(entry->old_roots);
|
|
kfree(entry);
|
|
}
|
|
*root = RB_ROOT;
|
|
}
|