1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * Simple file system for zoned block devices 3 * Simple file system for zoned block devices exposing zones as files.
4 * 4 *
5 * Copyright (C) 2022 Western Digital Corporat 5 * Copyright (C) 2022 Western Digital Corporation or its affiliates.
6 */ 6 */
7 #include <linux/fs.h> 7 #include <linux/fs.h>
8 #include <linux/seq_file.h> 8 #include <linux/seq_file.h>
9 #include <linux/blkdev.h> 9 #include <linux/blkdev.h>
10 10
11 #include "zonefs.h" 11 #include "zonefs.h"
12 12
13 struct zonefs_sysfs_attr { 13 struct zonefs_sysfs_attr {
14 struct attribute attr; 14 struct attribute attr;
15 ssize_t (*show)(struct zonefs_sb_info 15 ssize_t (*show)(struct zonefs_sb_info *sbi, char *buf);
16 }; 16 };
17 17
18 #define ZONEFS_SYSFS_ATTR_RO(name) \ 18 #define ZONEFS_SYSFS_ATTR_RO(name) \
19 static struct zonefs_sysfs_attr zonefs_sysfs_a 19 static struct zonefs_sysfs_attr zonefs_sysfs_attr_##name = __ATTR_RO(name)
20 20
21 #define ATTR_LIST(name) &zonefs_sysfs_attr_##n 21 #define ATTR_LIST(name) &zonefs_sysfs_attr_##name.attr
22 22
23 static ssize_t zonefs_sysfs_attr_show(struct k 23 static ssize_t zonefs_sysfs_attr_show(struct kobject *kobj,
24 struct a 24 struct attribute *attr, char *buf)
25 { 25 {
26 struct zonefs_sb_info *sbi = 26 struct zonefs_sb_info *sbi =
27 container_of(kobj, struct zone 27 container_of(kobj, struct zonefs_sb_info, s_kobj);
28 struct zonefs_sysfs_attr *zonefs_attr 28 struct zonefs_sysfs_attr *zonefs_attr =
29 container_of(attr, struct zone 29 container_of(attr, struct zonefs_sysfs_attr, attr);
30 30
31 if (!zonefs_attr->show) 31 if (!zonefs_attr->show)
32 return 0; 32 return 0;
33 33
34 return zonefs_attr->show(sbi, buf); 34 return zonefs_attr->show(sbi, buf);
35 } 35 }
36 36
37 static ssize_t max_wro_seq_files_show(struct z 37 static ssize_t max_wro_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
38 { 38 {
39 return sysfs_emit(buf, "%u\n", sbi->s_ 39 return sysfs_emit(buf, "%u\n", sbi->s_max_wro_seq_files);
40 } 40 }
41 ZONEFS_SYSFS_ATTR_RO(max_wro_seq_files); 41 ZONEFS_SYSFS_ATTR_RO(max_wro_seq_files);
42 42
43 static ssize_t nr_wro_seq_files_show(struct zo 43 static ssize_t nr_wro_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
44 { 44 {
45 return sysfs_emit(buf, "%d\n", atomic_ 45 return sysfs_emit(buf, "%d\n", atomic_read(&sbi->s_wro_seq_files));
46 } 46 }
47 ZONEFS_SYSFS_ATTR_RO(nr_wro_seq_files); 47 ZONEFS_SYSFS_ATTR_RO(nr_wro_seq_files);
48 48
49 static ssize_t max_active_seq_files_show(struc 49 static ssize_t max_active_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
50 { 50 {
51 return sysfs_emit(buf, "%u\n", sbi->s_ 51 return sysfs_emit(buf, "%u\n", sbi->s_max_active_seq_files);
52 } 52 }
53 ZONEFS_SYSFS_ATTR_RO(max_active_seq_files); 53 ZONEFS_SYSFS_ATTR_RO(max_active_seq_files);
54 54
55 static ssize_t nr_active_seq_files_show(struct 55 static ssize_t nr_active_seq_files_show(struct zonefs_sb_info *sbi, char *buf)
56 { 56 {
57 return sysfs_emit(buf, "%d\n", atomic_ 57 return sysfs_emit(buf, "%d\n", atomic_read(&sbi->s_active_seq_files));
58 } 58 }
59 ZONEFS_SYSFS_ATTR_RO(nr_active_seq_files); 59 ZONEFS_SYSFS_ATTR_RO(nr_active_seq_files);
60 60
61 static struct attribute *zonefs_sysfs_attrs[] 61 static struct attribute *zonefs_sysfs_attrs[] = {
62 ATTR_LIST(max_wro_seq_files), 62 ATTR_LIST(max_wro_seq_files),
63 ATTR_LIST(nr_wro_seq_files), 63 ATTR_LIST(nr_wro_seq_files),
64 ATTR_LIST(max_active_seq_files), 64 ATTR_LIST(max_active_seq_files),
65 ATTR_LIST(nr_active_seq_files), 65 ATTR_LIST(nr_active_seq_files),
66 NULL, 66 NULL,
67 }; 67 };
68 ATTRIBUTE_GROUPS(zonefs_sysfs); 68 ATTRIBUTE_GROUPS(zonefs_sysfs);
69 69
70 static void zonefs_sysfs_sb_release(struct kob 70 static void zonefs_sysfs_sb_release(struct kobject *kobj)
71 { 71 {
72 struct zonefs_sb_info *sbi = 72 struct zonefs_sb_info *sbi =
73 container_of(kobj, struct zone 73 container_of(kobj, struct zonefs_sb_info, s_kobj);
74 74
75 complete(&sbi->s_kobj_unregister); 75 complete(&sbi->s_kobj_unregister);
76 } 76 }
77 77
78 static const struct sysfs_ops zonefs_sysfs_att 78 static const struct sysfs_ops zonefs_sysfs_attr_ops = {
79 .show = zonefs_sysfs_attr_show, 79 .show = zonefs_sysfs_attr_show,
80 }; 80 };
81 81
82 static const struct kobj_type zonefs_sb_ktype 82 static const struct kobj_type zonefs_sb_ktype = {
83 .default_groups = zonefs_sysfs_groups, 83 .default_groups = zonefs_sysfs_groups,
84 .sysfs_ops = &zonefs_sysfs_attr_o 84 .sysfs_ops = &zonefs_sysfs_attr_ops,
85 .release = zonefs_sysfs_sb_rele 85 .release = zonefs_sysfs_sb_release,
86 }; 86 };
87 87
88 static struct kobject *zonefs_sysfs_root; 88 static struct kobject *zonefs_sysfs_root;
89 89
90 int zonefs_sysfs_register(struct super_block * 90 int zonefs_sysfs_register(struct super_block *sb)
91 { 91 {
92 struct zonefs_sb_info *sbi = ZONEFS_SB 92 struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
93 int ret; 93 int ret;
94 94
95 super_set_sysfs_name_id(sb); <<
96 init_completion(&sbi->s_kobj_unregiste 95 init_completion(&sbi->s_kobj_unregister);
97 ret = kobject_init_and_add(&sbi->s_kob 96 ret = kobject_init_and_add(&sbi->s_kobj, &zonefs_sb_ktype,
98 zonefs_sysf 97 zonefs_sysfs_root, "%s", sb->s_id);
99 if (ret) { 98 if (ret) {
100 kobject_put(&sbi->s_kobj); 99 kobject_put(&sbi->s_kobj);
101 wait_for_completion(&sbi->s_ko 100 wait_for_completion(&sbi->s_kobj_unregister);
102 return ret; 101 return ret;
103 } 102 }
104 103
105 sbi->s_sysfs_registered = true; 104 sbi->s_sysfs_registered = true;
106 105
107 return 0; 106 return 0;
108 } 107 }
109 108
110 void zonefs_sysfs_unregister(struct super_bloc 109 void zonefs_sysfs_unregister(struct super_block *sb)
111 { 110 {
112 struct zonefs_sb_info *sbi = ZONEFS_SB 111 struct zonefs_sb_info *sbi = ZONEFS_SB(sb);
113 112
114 if (!sbi || !sbi->s_sysfs_registered) 113 if (!sbi || !sbi->s_sysfs_registered)
115 return; 114 return;
116 115
117 kobject_del(&sbi->s_kobj); 116 kobject_del(&sbi->s_kobj);
118 kobject_put(&sbi->s_kobj); 117 kobject_put(&sbi->s_kobj);
119 wait_for_completion(&sbi->s_kobj_unreg 118 wait_for_completion(&sbi->s_kobj_unregister);
120 } 119 }
121 120
122 int __init zonefs_sysfs_init(void) 121 int __init zonefs_sysfs_init(void)
123 { 122 {
124 zonefs_sysfs_root = kobject_create_and 123 zonefs_sysfs_root = kobject_create_and_add("zonefs", fs_kobj);
125 if (!zonefs_sysfs_root) 124 if (!zonefs_sysfs_root)
126 return -ENOMEM; 125 return -ENOMEM;
127 126
128 return 0; 127 return 0;
129 } 128 }
130 129
131 void zonefs_sysfs_exit(void) 130 void zonefs_sysfs_exit(void)
132 { 131 {
133 kobject_put(zonefs_sysfs_root); 132 kobject_put(zonefs_sysfs_root);
134 zonefs_sysfs_root = NULL; 133 zonefs_sysfs_root = NULL;
135 } 134 }
136 135
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