1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * Simple zone file system for zoned block dev 3 * Simple zone file system for zoned block devices.
4 * 4 *
5 * Copyright (C) 2019 Western Digital Corporat 5 * Copyright (C) 2019 Western Digital Corporation or its affiliates.
6 */ 6 */
7 #ifndef __ZONEFS_H__ 7 #ifndef __ZONEFS_H__
8 #define __ZONEFS_H__ 8 #define __ZONEFS_H__
9 9
10 #include <linux/fs.h> 10 #include <linux/fs.h>
11 #include <linux/magic.h> 11 #include <linux/magic.h>
12 #include <linux/uuid.h> 12 #include <linux/uuid.h>
13 #include <linux/mutex.h> 13 #include <linux/mutex.h>
14 #include <linux/rwsem.h> 14 #include <linux/rwsem.h>
15 #include <linux/kobject.h> <<
16 15
17 /* 16 /*
18 * Maximum length of file names: this only nee 17 * Maximum length of file names: this only needs to be large enough to fit
19 * the zone group directory names and a decima 18 * the zone group directory names and a decimal zone number for file names.
20 * 16 characters is plenty. 19 * 16 characters is plenty.
21 */ 20 */
22 #define ZONEFS_NAME_MAX 16 21 #define ZONEFS_NAME_MAX 16
23 22
24 /* 23 /*
25 * Zone types: ZONEFS_ZTYPE_SEQ is used for al 24 * Zone types: ZONEFS_ZTYPE_SEQ is used for all sequential zone types
26 * defined in linux/blkzoned.h, that is, BLK_Z 25 * defined in linux/blkzoned.h, that is, BLK_ZONE_TYPE_SEQWRITE_REQ and
27 * BLK_ZONE_TYPE_SEQWRITE_PREF. 26 * BLK_ZONE_TYPE_SEQWRITE_PREF.
28 */ 27 */
29 enum zonefs_ztype { 28 enum zonefs_ztype {
30 ZONEFS_ZTYPE_CNV, 29 ZONEFS_ZTYPE_CNV,
31 ZONEFS_ZTYPE_SEQ, 30 ZONEFS_ZTYPE_SEQ,
32 ZONEFS_ZTYPE_MAX, 31 ZONEFS_ZTYPE_MAX,
33 }; 32 };
34 33
35 static inline enum zonefs_ztype zonefs_zone_ty 34 static inline enum zonefs_ztype zonefs_zone_type(struct blk_zone *zone)
36 { 35 {
37 if (zone->type == BLK_ZONE_TYPE_CONVEN 36 if (zone->type == BLK_ZONE_TYPE_CONVENTIONAL)
38 return ZONEFS_ZTYPE_CNV; 37 return ZONEFS_ZTYPE_CNV;
39 return ZONEFS_ZTYPE_SEQ; 38 return ZONEFS_ZTYPE_SEQ;
40 } 39 }
41 40
42 #define ZONEFS_ZONE_INIT_MODE (1U << 0) <<
43 #define ZONEFS_ZONE_OPEN (1U << 1) <<
44 #define ZONEFS_ZONE_ACTIVE (1U << 2) <<
45 #define ZONEFS_ZONE_OFFLINE (1U << 3) <<
46 #define ZONEFS_ZONE_READONLY (1U << 4) <<
47 #define ZONEFS_ZONE_CNV (1U << 31) <<
48 <<
49 /* <<
50 * In-memory per-file inode zone data. <<
51 */ <<
52 struct zonefs_zone { <<
53 /* Zone state flags */ <<
54 unsigned int z_flags; <<
55 <<
56 /* Zone start sector (512B unit) */ <<
57 sector_t z_sector; <<
58 <<
59 /* Zone size (bytes) */ <<
60 loff_t z_size; <<
61 <<
62 /* Zone capacity (file maximum size, b <<
63 loff_t z_capacity; <<
64 <<
65 /* Write pointer offset in the zone (s <<
66 loff_t z_wpoffset; <<
67 <<
68 /* Saved inode uid, gid and access rig <<
69 umode_t z_mode; <<
70 kuid_t z_uid; <<
71 kgid_t z_gid; <<
72 }; <<
73 <<
74 /* <<
75 * In memory zone group information: all zones <<
76 * as files, one file per zone. <<
77 */ <<
78 struct zonefs_zone_group { <<
79 struct inode *g_inode; <<
80 unsigned int g_nr_zones; <<
81 struct zonefs_zone *g_zones; <<
82 }; <<
83 <<
84 /* 41 /*
85 * In-memory inode data. 42 * In-memory inode data.
86 */ 43 */
87 struct zonefs_inode_info { 44 struct zonefs_inode_info {
88 struct inode i_vnode; 45 struct inode i_vnode;
89 46
>> 47 /* File zone type */
>> 48 enum zonefs_ztype i_ztype;
>> 49
>> 50 /* File zone start sector (512B unit) */
>> 51 sector_t i_zsector;
>> 52
>> 53 /* File zone write pointer position (sequential zones only) */
>> 54 loff_t i_wpoffset;
>> 55
>> 56 /* File maximum size */
>> 57 loff_t i_max_size;
>> 58
90 /* 59 /*
91 * To serialise fully against both sys 60 * To serialise fully against both syscall and mmap based IO and
92 * sequential file truncation, two loc 61 * sequential file truncation, two locks are used. For serializing
93 * zonefs_seq_file_truncate() against 62 * zonefs_seq_file_truncate() against zonefs_iomap_begin(), that is,
94 * file truncate operations against bl 63 * file truncate operations against block mapping, i_truncate_mutex is
95 * used. i_truncate_mutex also protect 64 * used. i_truncate_mutex also protects against concurrent accesses
96 * and changes to the inode private da 65 * and changes to the inode private data, and in particular changes to
97 * a sequential file size on completio 66 * a sequential file size on completion of direct IO writes.
98 * Serialization of mmap read IOs with 67 * Serialization of mmap read IOs with truncate and syscall IO
99 * operations is done with invalidate_ !! 68 * operations is done with i_mmap_sem in addition to i_truncate_mutex.
100 * i_truncate_mutex. Only zonefs_seq_ !! 69 * Only zonefs_seq_file_truncate() takes both lock (i_mmap_sem first,
101 * (invalidate_lock first, i_truncate_ !! 70 * i_truncate_mutex second).
102 */ 71 */
103 struct mutex i_truncate_mut 72 struct mutex i_truncate_mutex;
104 !! 73 struct rw_semaphore i_mmap_sem;
105 /* guarded by i_truncate_mutex */ <<
106 unsigned int i_wr_refcnt; <<
107 }; 74 };
108 75
109 static inline struct zonefs_inode_info *ZONEFS 76 static inline struct zonefs_inode_info *ZONEFS_I(struct inode *inode)
110 { 77 {
111 return container_of(inode, struct zone 78 return container_of(inode, struct zonefs_inode_info, i_vnode);
112 } 79 }
113 80
114 static inline bool zonefs_zone_is_cnv(struct z <<
115 { <<
116 return z->z_flags & ZONEFS_ZONE_CNV; <<
117 } <<
118 <<
119 static inline bool zonefs_zone_is_seq(struct z <<
120 { <<
121 return !zonefs_zone_is_cnv(z); <<
122 } <<
123 <<
124 static inline struct zonefs_zone *zonefs_inode <<
125 { <<
126 return inode->i_private; <<
127 } <<
128 <<
129 static inline bool zonefs_inode_is_cnv(struct <<
130 { <<
131 return zonefs_zone_is_cnv(zonefs_inode <<
132 } <<
133 <<
134 static inline bool zonefs_inode_is_seq(struct <<
135 { <<
136 return zonefs_zone_is_seq(zonefs_inode <<
137 } <<
138 <<
139 /* 81 /*
140 * On-disk super block (block 0). 82 * On-disk super block (block 0).
141 */ 83 */
142 #define ZONEFS_LABEL_LEN 64 84 #define ZONEFS_LABEL_LEN 64
143 #define ZONEFS_UUID_SIZE 16 85 #define ZONEFS_UUID_SIZE 16
144 #define ZONEFS_SUPER_SIZE 4096 86 #define ZONEFS_SUPER_SIZE 4096
145 87
146 struct zonefs_super { 88 struct zonefs_super {
147 89
148 /* Magic number */ 90 /* Magic number */
149 __le32 s_magic; 91 __le32 s_magic;
150 92
151 /* Checksum */ 93 /* Checksum */
152 __le32 s_crc; 94 __le32 s_crc;
153 95
154 /* Volume label */ 96 /* Volume label */
155 char s_label[ZONEFS_LABEL_L 97 char s_label[ZONEFS_LABEL_LEN];
156 98
157 /* 128-bit uuid */ 99 /* 128-bit uuid */
158 __u8 s_uuid[ZONEFS_UUID_SIZ 100 __u8 s_uuid[ZONEFS_UUID_SIZE];
159 101
160 /* Features */ 102 /* Features */
161 __le64 s_features; 103 __le64 s_features;
162 104
163 /* UID/GID to use for files */ 105 /* UID/GID to use for files */
164 __le32 s_uid; 106 __le32 s_uid;
165 __le32 s_gid; 107 __le32 s_gid;
166 108
167 /* File permissions */ 109 /* File permissions */
168 __le32 s_perm; 110 __le32 s_perm;
169 111
170 /* Padding to ZONEFS_SUPER_SIZE bytes 112 /* Padding to ZONEFS_SUPER_SIZE bytes */
171 __u8 s_reserved[3988]; 113 __u8 s_reserved[3988];
172 114
173 } __packed; 115 } __packed;
174 116
175 /* 117 /*
176 * Feature flags: specified in the s_features 118 * Feature flags: specified in the s_features field of the on-disk super
177 * block struct zonefs_super and in-memory in 119 * block struct zonefs_super and in-memory in the s_feartures field of
178 * struct zonefs_sb_info. 120 * struct zonefs_sb_info.
179 */ 121 */
180 enum zonefs_features { 122 enum zonefs_features {
181 /* 123 /*
182 * Aggregate contiguous conventional z 124 * Aggregate contiguous conventional zones into a single file.
183 */ 125 */
184 ZONEFS_F_AGGRCNV = 1ULL << 0, 126 ZONEFS_F_AGGRCNV = 1ULL << 0,
185 /* 127 /*
186 * Use super block specified UID for f 128 * Use super block specified UID for files instead of default 0.
187 */ 129 */
188 ZONEFS_F_UID = 1ULL << 1, 130 ZONEFS_F_UID = 1ULL << 1,
189 /* 131 /*
190 * Use super block specified GID for f 132 * Use super block specified GID for files instead of default 0.
191 */ 133 */
192 ZONEFS_F_GID = 1ULL << 2, 134 ZONEFS_F_GID = 1ULL << 2,
193 /* 135 /*
194 * Use super block specified file perm 136 * Use super block specified file permissions instead of default 640.
195 */ 137 */
196 ZONEFS_F_PERM = 1ULL << 3, 138 ZONEFS_F_PERM = 1ULL << 3,
197 }; 139 };
198 140
199 #define ZONEFS_F_DEFINED_FEATURES \ 141 #define ZONEFS_F_DEFINED_FEATURES \
200 (ZONEFS_F_AGGRCNV | ZONEFS_F_UID | ZON 142 (ZONEFS_F_AGGRCNV | ZONEFS_F_UID | ZONEFS_F_GID | ZONEFS_F_PERM)
201 143
202 /* 144 /*
203 * Mount options for zone write pointer error 145 * Mount options for zone write pointer error handling.
204 */ 146 */
205 #define ZONEFS_MNTOPT_ERRORS_RO (1 << 147 #define ZONEFS_MNTOPT_ERRORS_RO (1 << 0) /* Make zone file readonly */
206 #define ZONEFS_MNTOPT_ERRORS_ZRO (1 << 148 #define ZONEFS_MNTOPT_ERRORS_ZRO (1 << 1) /* Make zone file offline */
207 #define ZONEFS_MNTOPT_ERRORS_ZOL (1 << 149 #define ZONEFS_MNTOPT_ERRORS_ZOL (1 << 2) /* Make zone file offline */
208 #define ZONEFS_MNTOPT_ERRORS_REPAIR (1 << 150 #define ZONEFS_MNTOPT_ERRORS_REPAIR (1 << 3) /* Remount read-only */
209 #define ZONEFS_MNTOPT_ERRORS_MASK \ 151 #define ZONEFS_MNTOPT_ERRORS_MASK \
210 (ZONEFS_MNTOPT_ERRORS_RO | ZONEFS_MNTO 152 (ZONEFS_MNTOPT_ERRORS_RO | ZONEFS_MNTOPT_ERRORS_ZRO | \
211 ZONEFS_MNTOPT_ERRORS_ZOL | ZONEFS_MNT 153 ZONEFS_MNTOPT_ERRORS_ZOL | ZONEFS_MNTOPT_ERRORS_REPAIR)
212 #define ZONEFS_MNTOPT_EXPLICIT_OPEN (1 << <<
213 154
214 /* 155 /*
215 * In-memory Super block information. 156 * In-memory Super block information.
216 */ 157 */
217 struct zonefs_sb_info { 158 struct zonefs_sb_info {
218 159
219 unsigned long s_mount_opts; 160 unsigned long s_mount_opts;
220 161
221 spinlock_t s_lock; 162 spinlock_t s_lock;
222 163
223 unsigned long long s_features; 164 unsigned long long s_features;
224 kuid_t s_uid; 165 kuid_t s_uid;
225 kgid_t s_gid; 166 kgid_t s_gid;
226 umode_t s_perm; 167 umode_t s_perm;
227 uuid_t s_uuid; 168 uuid_t s_uuid;
228 unsigned int s_zone_sectors 169 unsigned int s_zone_sectors_shift;
229 170
230 struct zonefs_zone_group s_zgroup[ZONE !! 171 unsigned int s_nr_files[ZONEFS_ZTYPE_MAX];
231 172
232 loff_t s_blocks; 173 loff_t s_blocks;
233 loff_t s_used_blocks; 174 loff_t s_used_blocks;
234 <<
235 unsigned int s_max_wro_seq_ <<
236 atomic_t s_wro_seq_file <<
237 <<
238 unsigned int s_max_active_s <<
239 atomic_t s_active_seq_f <<
240 <<
241 bool s_sysfs_regist <<
242 struct kobject s_kobj; <<
243 struct completion s_kobj_unregis <<
244 }; 175 };
245 176
246 static inline struct zonefs_sb_info *ZONEFS_SB 177 static inline struct zonefs_sb_info *ZONEFS_SB(struct super_block *sb)
247 { 178 {
248 return sb->s_fs_info; 179 return sb->s_fs_info;
249 } 180 }
250 181
251 #define zonefs_info(sb, format, args...) 182 #define zonefs_info(sb, format, args...) \
252 pr_info("zonefs (%s): " format, sb->s_ 183 pr_info("zonefs (%s): " format, sb->s_id, ## args)
253 #define zonefs_err(sb, format, args...) 184 #define zonefs_err(sb, format, args...) \
254 pr_err("zonefs (%s) ERROR: " format, s 185 pr_err("zonefs (%s) ERROR: " format, sb->s_id, ## args)
255 #define zonefs_warn(sb, format, args...) 186 #define zonefs_warn(sb, format, args...) \
256 pr_warn("zonefs (%s) WARNING: " format 187 pr_warn("zonefs (%s) WARNING: " format, sb->s_id, ## args)
257 <<
258 /* In super.c */ <<
259 void zonefs_inode_account_active(struct inode <<
260 int zonefs_inode_zone_mgmt(struct inode *inode <<
261 void zonefs_i_size_write(struct inode *inode, <<
262 void zonefs_update_stats(struct inode *inode, <<
263 void __zonefs_io_error(struct inode *inode, bo <<
264 <<
265 static inline void zonefs_io_error(struct inod <<
266 { <<
267 struct zonefs_inode_info *zi = ZONEFS_ <<
268 <<
269 mutex_lock(&zi->i_truncate_mutex); <<
270 __zonefs_io_error(inode, write); <<
271 mutex_unlock(&zi->i_truncate_mutex); <<
272 } <<
273 <<
274 /* In super.c */ <<
275 extern const struct inode_operations zonefs_di <<
276 extern const struct file_operations zonefs_dir <<
277 <<
278 /* In file.c */ <<
279 extern const struct address_space_operations z <<
280 extern const struct file_operations zonefs_fil <<
281 int zonefs_file_truncate(struct inode *inode, <<
282 <<
283 /* In sysfs.c */ <<
284 int zonefs_sysfs_register(struct super_block * <<
285 void zonefs_sysfs_unregister(struct super_bloc <<
286 int zonefs_sysfs_init(void); <<
287 void zonefs_sysfs_exit(void); <<
288 188
289 #endif 189 #endif
290 190
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