106  * enum sysctl_writes_mode - supported sysctl write modes
108  * @SYSCTL_WRITES_LEGACY: each write syscall must fully contain the sysctl value
116  *	sent to the write syscall. If dealing with strings respect the file
121  * These write modes control how current file position affects the behavior of
122  * updating sysctl values through the proc interface on each write.
146 static int _proc_do_string(char *data, int maxlen, int write,  in _proc_do_string()  argument
157 	if (write) {  in _proc_do_string()
245  * @write: %TRUE if this is a write to the sysctl file
259 int proc_dostring(const struct ctl_table *table, int write,  in proc_dostring()  argument
262 	if (write)  in proc_dostring()
265 	return _proc_do_string(table->data, table->maxlen, write, buffer, lenp,  in proc_dostring()
429 				 int write, void *data)  in do_proc_dointvec_conv()  argument
431 	if (write) {  in do_proc_dointvec_conv()
456 				  int write, void *data)  in do_proc_douintvec_conv()  argument
458 	if (write) {  in do_proc_douintvec_conv()
472 		  int write, void *buffer,  in __do_proc_dointvec()  argument
475 			      int write, void *data),  in __do_proc_dointvec()
482 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_dointvec()
494 	if (write) {  in __do_proc_dointvec()
507 		if (write) {  in __do_proc_dointvec()
532 	if (!write && !first && left && !err)  in __do_proc_dointvec()
534 	if (write && !err && left)  in __do_proc_dointvec()
536 	if (write && first)  in __do_proc_dointvec()
544 static int do_proc_dointvec(const struct ctl_table *table, int write,  in do_proc_dointvec()  argument
547 			      int write, void *data),  in do_proc_dointvec()
550 	return __do_proc_dointvec(table->data, table, write,  in do_proc_dointvec()
560 					   int write, void *data),  in do_proc_douintvec_w()  argument
615 					   int write, void *data),  in do_proc_douintvec_r()  argument
643 			       int write, void *buffer,  in __do_proc_douintvec()  argument
647 					   int write, void *data),  in __do_proc_douintvec()
652 	if (!tbl_data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_douintvec()
672 	if (write)  in __do_proc_douintvec()
678 int do_proc_douintvec(const struct ctl_table *table, int write,  in do_proc_douintvec()  argument
682 				  int write, void *data),  in do_proc_douintvec()
685 	return __do_proc_douintvec(table->data, table, write,  in do_proc_douintvec()
690  * proc_dobool - read/write a bool
692  * @write: %TRUE if this is a write to the sysctl file
705 int proc_dobool(const struct ctl_table *table, int write, void *buffer,  in proc_dobool()  argument
721 	res = proc_dointvec(&tmp, write, buffer, lenp, ppos);  in proc_dobool()
724 	if (write)  in proc_dobool()
732  * @write: %TRUE if this is a write to the sysctl file
742 int proc_dointvec(const struct ctl_table *table, int write, void *buffer,  in proc_dointvec()  argument
745 	return do_proc_dointvec(table, write, buffer, lenp, ppos, NULL, NULL);  in proc_dointvec()
751  * @write: %TRUE if this is a write to the sysctl file
761 int proc_douintvec(const struct ctl_table *table, int write, void *buffer,  in proc_douintvec()  argument
764 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_douintvec()
772 static int proc_taint(const struct ctl_table *table, int write,  in proc_taint()  argument
779 	if (write && !capable(CAP_SYS_ADMIN))  in proc_taint()
784 	err = proc_doulongvec_minmax(&t, write, buffer, lenp, ppos);  in proc_taint()
788 	if (write) {  in proc_taint()
827 					int write, void *data)  in do_proc_dointvec_minmax_conv()  argument
835 	int *ip = write ? &tmp : valp;  in do_proc_dointvec_minmax_conv()
837 	ret = do_proc_dointvec_conv(negp, lvalp, ip, write, data);  in do_proc_dointvec_minmax_conv()
841 	if (write) {  in do_proc_dointvec_minmax_conv()
854  * @write: %TRUE if this is a write to the sysctl file
865  * Returns 0 on success or -EINVAL on write when the range check fails.
867 int proc_dointvec_minmax(const struct ctl_table *table, int write,  in proc_dointvec_minmax()  argument
874 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_minmax()
894 					 int write, void *data)  in do_proc_douintvec_minmax_conv()  argument
899 	/* write via temporary local uint for bounds-checking */  in do_proc_douintvec_minmax_conv()
900 	unsigned int *up = write ? &tmp : valp;  in do_proc_douintvec_minmax_conv()
902 	ret = do_proc_douintvec_conv(lvalp, up, write, data);  in do_proc_douintvec_minmax_conv()
906 	if (write) {  in do_proc_douintvec_minmax_conv()
920  * @write: %TRUE if this is a write to the sysctl file
934  * Returns 0 on success or -ERANGE on write when the range check fails.
936 int proc_douintvec_minmax(const struct ctl_table *table, int write,  in proc_douintvec_minmax()  argument
943 	return do_proc_douintvec(table, write, buffer, lenp, ppos,  in proc_douintvec_minmax()
950  * @write: %TRUE if this is a write to the sysctl file
962  * Returns 0 on success or an error on write when the range check fails.
964 int proc_dou8vec_minmax(const struct ctl_table *table, int write,  in proc_dou8vec_minmax()  argument
990 	res = do_proc_douintvec(&tmp, write, buffer, lenp, ppos,  in proc_dou8vec_minmax()
994 	if (write)  in proc_dou8vec_minmax()
1001 static int sysrq_sysctl_handler(const struct ctl_table *table, int write,  in sysrq_sysctl_handler()  argument
1008 	ret = __do_proc_dointvec(&tmp, table, write, buffer,  in sysrq_sysctl_handler()
1010 	if (ret || !write)  in sysrq_sysctl_handler()
1013 	if (write)  in sysrq_sysctl_handler()
1021 		const struct ctl_table *table, int write,  in __do_proc_doulongvec_minmax()  argument
1030 	if (!data || !table->maxlen || !*lenp || (*ppos && !write)) {  in __do_proc_doulongvec_minmax()
1041 	if (write) {  in __do_proc_doulongvec_minmax()
1053 		if (write) {  in __do_proc_doulongvec_minmax()
1082 	if (!write && !first && left && !err)  in __do_proc_doulongvec_minmax()
1084 	if (write && !err)  in __do_proc_doulongvec_minmax()
1086 	if (write && first)  in __do_proc_doulongvec_minmax()
1094 static int do_proc_doulongvec_minmax(const struct ctl_table *table, int write,  in do_proc_doulongvec_minmax()  argument
1098 	return __do_proc_doulongvec_minmax(table->data, table, write,  in do_proc_doulongvec_minmax()
1105  * @write: %TRUE if this is a write to the sysctl file
1118 int proc_doulongvec_minmax(const struct ctl_table *table, int write,  in proc_doulongvec_minmax()  argument
1121     return do_proc_doulongvec_minmax(table, write, buffer, lenp, ppos, 1l, 1l);  in proc_doulongvec_minmax()
1127  * @write: %TRUE if this is a write to the sysctl file
1141 int proc_doulongvec_ms_jiffies_minmax(const struct ctl_table *table, int write,  in proc_doulongvec_ms_jiffies_minmax()  argument
1144     return do_proc_doulongvec_minmax(table, write, buffer,  in proc_doulongvec_ms_jiffies_minmax()
1151 					 int write, void *data)  in do_proc_dointvec_jiffies_conv()  argument
1153 	if (write) {  in do_proc_dointvec_jiffies_conv()
1177 						int write, void *data)  in do_proc_dointvec_userhz_jiffies_conv()  argument
1179 	if (write) {  in do_proc_dointvec_userhz_jiffies_conv()
1200 					    int write, void *data)  in do_proc_dointvec_ms_jiffies_conv()  argument
1202 	if (write) {  in do_proc_dointvec_ms_jiffies_conv()
1224 						int *valp, int write, void *data)  in do_proc_dointvec_ms_jiffies_minmax_conv()  argument
1232 	int *ip = write ? &tmp : valp;  in do_proc_dointvec_ms_jiffies_minmax_conv()
1234 	ret = do_proc_dointvec_ms_jiffies_conv(negp, lvalp, ip, write, data);  in do_proc_dointvec_ms_jiffies_minmax_conv()
1238 	if (write) {  in do_proc_dointvec_ms_jiffies_minmax_conv()
1250  * @write: %TRUE if this is a write to the sysctl file
1262 int proc_dointvec_jiffies(const struct ctl_table *table, int write,  in proc_dointvec_jiffies()  argument
1265     return do_proc_dointvec(table,write,buffer,lenp,ppos,  in proc_dointvec_jiffies()
1269 int proc_dointvec_ms_jiffies_minmax(const struct ctl_table *table, int write,  in proc_dointvec_ms_jiffies_minmax()  argument
1276 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_ms_jiffies_minmax()
1283  * @write: %TRUE if this is a write to the sysctl file
1295 int proc_dointvec_userhz_jiffies(const struct ctl_table *table, int write,  in proc_dointvec_userhz_jiffies()  argument
1298 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_userhz_jiffies()
1305  * @write: %TRUE if this is a write to the sysctl file
1318 int proc_dointvec_ms_jiffies(const struct ctl_table *table, int write, void *buffer,  in proc_dointvec_ms_jiffies()  argument
1321 	return do_proc_dointvec(table, write, buffer, lenp, ppos,  in proc_dointvec_ms_jiffies()
1325 static int proc_do_cad_pid(const struct ctl_table *table, int write, void *buffer,  in proc_do_cad_pid()  argument
1334 	r = __do_proc_dointvec(&tmp, table, write, buffer,  in proc_do_cad_pid()
1336 	if (r || !write)  in proc_do_cad_pid()
1348  * proc_do_large_bitmap - read/write from/to a large bitmap
1350  * @write: %TRUE if this is a write to the sysctl file
1364 int proc_do_large_bitmap(const struct ctl_table *table, int write,  in proc_do_large_bitmap()  argument
1374 	if (!bitmap || !bitmap_len || !left || (*ppos && !write)) {  in proc_do_large_bitmap()
1379 	if (write) {  in proc_do_large_bitmap()
1480 		if (write) {  in proc_do_large_bitmap()
1496 int proc_dostring(const struct ctl_table *table, int write,  in proc_dostring()  argument
1502 int proc_dobool(const struct ctl_table *table, int write,  in proc_dobool()  argument
1508 int proc_dointvec(const struct ctl_table *table, int write,  in proc_dointvec()  argument
1514 int proc_douintvec(const struct ctl_table *table, int write,  in proc_douintvec()  argument
1520 int proc_dointvec_minmax(const struct ctl_table *table, int write,  in proc_dointvec_minmax()  argument
1526 int proc_douintvec_minmax(const struct ctl_table *table, int write,  in proc_douintvec_minmax()  argument
1532 int proc_dou8vec_minmax(const struct ctl_table *table, int write,  in proc_dou8vec_minmax()  argument
1538 int proc_dointvec_jiffies(const struct ctl_table *table, int write,  in proc_dointvec_jiffies()  argument
1544 int proc_dointvec_ms_jiffies_minmax(const struct ctl_table *table, int write,  in proc_dointvec_ms_jiffies_minmax()  argument
1550 int proc_dointvec_userhz_jiffies(const struct ctl_table *table, int write,  in proc_dointvec_userhz_jiffies()  argument
1556 int proc_dointvec_ms_jiffies(const struct ctl_table *table, int write,  in proc_dointvec_ms_jiffies()  argument
1562 int proc_doulongvec_minmax(const struct ctl_table *table, int write,  in proc_doulongvec_minmax()  argument
1568 int proc_doulongvec_ms_jiffies_minmax(const struct ctl_table *table, int write,  in proc_doulongvec_ms_jiffies_minmax()  argument
1574 int proc_do_large_bitmap(const struct ctl_table *table, int write,  in proc_do_large_bitmap()  argument
1583 int proc_do_static_key(const struct ctl_table *table, int write,  in proc_do_static_key()  argument
1597 	if (write && !capable(CAP_SYS_ADMIN))  in proc_do_static_key()
1602 	ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);  in proc_do_static_key()
1603 	if (write && !ret) {  in proc_do_static_key()