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9#include <linux/time.h>
10#include <linux/fs.h>
11#include <linux/slab.h>
12#include <linux/buffer_head.h>
13#include <linux/blk_types.h>
14
15#include "exfat_raw.h"
16#include "exfat_fs.h"
17
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25
26void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
27{
28 struct exfat_mount_options *opts = &EXFAT_SB(sb)->options;
29 va_list args;
30 struct va_format vaf;
31
32 if (report) {
33 va_start(args, fmt);
34 vaf.fmt = fmt;
35 vaf.va = &args;
36 exfat_err(sb, "error, %pV", &vaf);
37 va_end(args);
38 }
39
40 if (opts->errors == EXFAT_ERRORS_PANIC) {
41 panic("exFAT-fs (%s): fs panic from previous error\n",
42 sb->s_id);
43 } else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) {
44 sb->s_flags |= SB_RDONLY;
45 exfat_err(sb, "Filesystem has been set read-only");
46 }
47}
48
49
50
51
52
53void exfat_msg(struct super_block *sb, const char *level, const char *fmt, ...)
54{
55 struct va_format vaf;
56 va_list args;
57
58 va_start(args, fmt);
59 vaf.fmt = fmt;
60 vaf.va = &args;
61
62 printk("%sexFAT-fs (%s): %pV\n", level, sb->s_id, &vaf);
63 va_end(args);
64}
65
66#define SECS_PER_MIN (60)
67#define TIMEZONE_SEC(x) ((x) * 15 * SECS_PER_MIN)
68
69static void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off)
70{
71 if (tz_off <= 0x3F)
72 ts->tv_sec -= TIMEZONE_SEC(tz_off);
73 else
74 ts->tv_sec += TIMEZONE_SEC(0x80 - tz_off);
75}
76
77
78void exfat_get_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
79 u8 tz, __le16 time, __le16 date, u8 time_cs)
80{
81 u16 t = le16_to_cpu(time);
82 u16 d = le16_to_cpu(date);
83
84 ts->tv_sec = mktime64(1980 + (d >> 9), d >> 5 & 0x000F, d & 0x001F,
85 t >> 11, (t >> 5) & 0x003F, (t & 0x001F) << 1);
86
87
88
89 if (time_cs) {
90 ts->tv_sec += time_cs / 100;
91 ts->tv_nsec = (time_cs % 100) * 10 * NSEC_PER_MSEC;
92 } else
93 ts->tv_nsec = 0;
94
95 if (tz & EXFAT_TZ_VALID)
96
97 exfat_adjust_tz(ts, tz & ~EXFAT_TZ_VALID);
98 else
99
100 ts->tv_sec -= sbi->options.time_offset * SECS_PER_MIN;
101}
102
103
104void exfat_set_entry_time(struct exfat_sb_info *sbi, struct timespec64 *ts,
105 u8 *tz, __le16 *time, __le16 *date, u8 *time_cs)
106{
107 struct tm tm;
108 u16 t, d;
109
110 time64_to_tm(ts->tv_sec, 0, &tm);
111 t = (tm.tm_hour << 11) | (tm.tm_min << 5) | (tm.tm_sec >> 1);
112 d = ((tm.tm_year - 80) << 9) | ((tm.tm_mon + 1) << 5) | tm.tm_mday;
113
114 *time = cpu_to_le16(t);
115 *date = cpu_to_le16(d);
116
117
118 if (time_cs)
119 *time_cs = (tm.tm_sec & 1) * 100 +
120 ts->tv_nsec / (10 * NSEC_PER_MSEC);
121
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124
125
126 *tz = EXFAT_TZ_VALID;
127}
128
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132
133
134void exfat_truncate_atime(struct timespec64 *ts)
135{
136 ts->tv_sec = round_down(ts->tv_sec, 2);
137 ts->tv_nsec = 0;
138}
139
140u16 exfat_calc_chksum16(void *data, int len, u16 chksum, int type)
141{
142 int i;
143 u8 *c = (u8 *)data;
144
145 for (i = 0; i < len; i++, c++) {
146 if (unlikely(type == CS_DIR_ENTRY && (i == 2 || i == 3)))
147 continue;
148 chksum = ((chksum << 15) | (chksum >> 1)) + *c;
149 }
150 return chksum;
151}
152
153u32 exfat_calc_chksum32(void *data, int len, u32 chksum, int type)
154{
155 int i;
156 u8 *c = (u8 *)data;
157
158 for (i = 0; i < len; i++, c++) {
159 if (unlikely(type == CS_BOOT_SECTOR &&
160 (i == 106 || i == 107 || i == 112)))
161 continue;
162 chksum = ((chksum << 31) | (chksum >> 1)) + *c;
163 }
164 return chksum;
165}
166
167void exfat_update_bh(struct buffer_head *bh, int sync)
168{
169 set_buffer_uptodate(bh);
170 mark_buffer_dirty(bh);
171
172 if (sync)
173 sync_dirty_buffer(bh);
174}
175
176int exfat_update_bhs(struct buffer_head **bhs, int nr_bhs, int sync)
177{
178 int i, err = 0;
179
180 for (i = 0; i < nr_bhs; i++) {
181 set_buffer_uptodate(bhs[i]);
182 mark_buffer_dirty(bhs[i]);
183 if (sync)
184 write_dirty_buffer(bhs[i], REQ_SYNC);
185 }
186
187 for (i = 0; i < nr_bhs && sync; i++) {
188 wait_on_buffer(bhs[i]);
189 if (!err && !buffer_uptodate(bhs[i]))
190 err = -EIO;
191 }
192 return err;
193}
194
195void exfat_chain_set(struct exfat_chain *ec, unsigned int dir,
196 unsigned int size, unsigned char flags)
197{
198 ec->dir = dir;
199 ec->size = size;
200 ec->flags = flags;
201}
202
203void exfat_chain_dup(struct exfat_chain *dup, struct exfat_chain *ec)
204{
205 return exfat_chain_set(dup, ec->dir, ec->size, ec->flags);
206}
207