utils.c (47e4937a4a7ca4184fd282791dfee76c6799966a) utils.c (8d8a09b093d7073465c824f74caf315c073d3875)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2018 HUAWEI, Inc.
4 * http://www.huawei.com/
5 * Created by Gao Xiang <gaoxiang25@huawei.com>
6 */
7#include "internal.h"
8#include <linux/pagevec.h>

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41#define __erofs_workgroup_put(grp) atomic_dec(&(grp)->refcount)
42
43static int erofs_workgroup_get(struct erofs_workgroup *grp)
44{
45 int o;
46
47repeat:
48 o = erofs_wait_on_workgroup_freezed(grp);
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2018 HUAWEI, Inc.
4 * http://www.huawei.com/
5 * Created by Gao Xiang <gaoxiang25@huawei.com>
6 */
7#include "internal.h"
8#include <linux/pagevec.h>

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41#define __erofs_workgroup_put(grp) atomic_dec(&(grp)->refcount)
42
43static int erofs_workgroup_get(struct erofs_workgroup *grp)
44{
45 int o;
46
47repeat:
48 o = erofs_wait_on_workgroup_freezed(grp);
49 if (unlikely(o <= 0))
49 if (o <= 0)
50 return -1;
51
50 return -1;
51
52 if (unlikely(atomic_cmpxchg(&grp->refcount, o, o + 1) != o))
52 if (atomic_cmpxchg(&grp->refcount, o, o + 1) != o)
53 goto repeat;
54
55 /* decrease refcount paired by erofs_workgroup_put */
53 goto repeat;
54
55 /* decrease refcount paired by erofs_workgroup_put */
56 if (unlikely(o == 1))
56 if (o == 1)
57 atomic_long_dec(&erofs_global_shrink_cnt);
58 return 0;
59}
60
61struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
62 pgoff_t index, bool *tag)
63{
64 struct erofs_sb_info *sbi = EROFS_SB(sb);

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86int erofs_register_workgroup(struct super_block *sb,
87 struct erofs_workgroup *grp,
88 bool tag)
89{
90 struct erofs_sb_info *sbi;
91 int err;
92
93 /* grp shouldn't be broken or used before */
57 atomic_long_dec(&erofs_global_shrink_cnt);
58 return 0;
59}
60
61struct erofs_workgroup *erofs_find_workgroup(struct super_block *sb,
62 pgoff_t index, bool *tag)
63{
64 struct erofs_sb_info *sbi = EROFS_SB(sb);

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86int erofs_register_workgroup(struct super_block *sb,
87 struct erofs_workgroup *grp,
88 bool tag)
89{
90 struct erofs_sb_info *sbi;
91 int err;
92
93 /* grp shouldn't be broken or used before */
94 if (unlikely(atomic_read(&grp->refcount) != 1)) {
94 if (atomic_read(&grp->refcount) != 1) {
95 DBG_BUGON(1);
96 return -EINVAL;
97 }
98
99 err = radix_tree_preload(GFP_NOFS);
100 if (err)
101 return err;
102

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108 /*
109 * Bump up reference count before making this workgroup
110 * visible to other users in order to avoid potential UAF
111 * without serialized by workstn_lock.
112 */
113 __erofs_workgroup_get(grp);
114
115 err = radix_tree_insert(&sbi->workstn_tree, grp->index, grp);
95 DBG_BUGON(1);
96 return -EINVAL;
97 }
98
99 err = radix_tree_preload(GFP_NOFS);
100 if (err)
101 return err;
102

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108 /*
109 * Bump up reference count before making this workgroup
110 * visible to other users in order to avoid potential UAF
111 * without serialized by workstn_lock.
112 */
113 __erofs_workgroup_get(grp);
114
115 err = radix_tree_insert(&sbi->workstn_tree, grp->index, grp);
116 if (unlikely(err))
116 if (err)
117 /*
118 * it's safe to decrease since the workgroup isn't visible
119 * and refcount >= 2 (cannot be freezed).
120 */
121 __erofs_workgroup_put(grp);
122
123 xa_unlock(&sbi->workstn_tree);
124 radix_tree_preload_end();

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207
208 first_index = grp->index + 1;
209
210 /* try to shrink each valid workgroup */
211 if (!erofs_try_to_release_workgroup(sbi, grp, cleanup))
212 continue;
213
214 ++freed;
117 /*
118 * it's safe to decrease since the workgroup isn't visible
119 * and refcount >= 2 (cannot be freezed).
120 */
121 __erofs_workgroup_put(grp);
122
123 xa_unlock(&sbi->workstn_tree);
124 radix_tree_preload_end();

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207
208 first_index = grp->index + 1;
209
210 /* try to shrink each valid workgroup */
211 if (!erofs_try_to_release_workgroup(sbi, grp, cleanup))
212 continue;
213
214 ++freed;
215 if (unlikely(!--nr_shrink))
215 if (!--nr_shrink)
216 break;
217 }
218 xa_unlock(&sbi->workstn_tree);
219
220 if (i && nr_shrink)
221 goto repeat;
222 return freed;
223}

--- 110 unchanged lines hidden --- 		216 break;
217 }
218 xa_unlock(&sbi->workstn_tree);
219
220 if (i && nr_shrink)
221 goto repeat;
222 return freed;
223}

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