Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File...........: linux/drivers/s390/block/dasd_proc.c |
| 3 | * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com> |
| 4 | * Horst Hummel <Horst.Hummel@de.ibm.com> |
| 5 | * Carsten Otte <Cotte@de.ibm.com> |
| 6 | * Martin Schwidefsky <schwidefsky@de.ibm.com> |
| 7 | * Bugreports.to..: <Linux390@de.ibm.com> |
| 8 | * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002 |
| 9 | * |
| 10 | * /proc interface for the dasd driver. |
| 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | */ |
| 13 | |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 14 | #define KMSG_COMPONENT "dasd" |
| 15 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/ctype.h> |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 17 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/seq_file.h> |
| 19 | #include <linux/vmalloc.h> |
Michael Holzheu | 66a464d | 2005-06-25 14:55:33 -0700 | [diff] [blame] | 20 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | |
| 22 | #include <asm/debug.h> |
| 23 | #include <asm/uaccess.h> |
| 24 | |
| 25 | /* This is ugly... */ |
| 26 | #define PRINTK_HEADER "dasd_proc:" |
| 27 | |
| 28 | #include "dasd_int.h" |
| 29 | |
| 30 | static struct proc_dir_entry *dasd_proc_root_entry = NULL; |
| 31 | static struct proc_dir_entry *dasd_devices_entry = NULL; |
| 32 | static struct proc_dir_entry *dasd_statistics_entry = NULL; |
| 33 | |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 34 | #ifdef CONFIG_DASD_PROFILE |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 35 | static char * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | dasd_get_user_string(const char __user *user_buf, size_t user_len) |
| 37 | { |
| 38 | char *buffer; |
| 39 | |
| 40 | buffer = kmalloc(user_len + 1, GFP_KERNEL); |
| 41 | if (buffer == NULL) |
| 42 | return ERR_PTR(-ENOMEM); |
| 43 | if (copy_from_user(buffer, user_buf, user_len) != 0) { |
| 44 | kfree(buffer); |
| 45 | return ERR_PTR(-EFAULT); |
| 46 | } |
| 47 | /* got the string, now strip linefeed. */ |
| 48 | if (buffer[user_len - 1] == '\n') |
| 49 | buffer[user_len - 1] = 0; |
| 50 | else |
| 51 | buffer[user_len] = 0; |
| 52 | return buffer; |
| 53 | } |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 54 | #endif /* CONFIG_DASD_PROFILE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | |
| 56 | static int |
| 57 | dasd_devices_show(struct seq_file *m, void *v) |
| 58 | { |
| 59 | struct dasd_device *device; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 60 | struct dasd_block *block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | char *substr; |
| 62 | |
| 63 | device = dasd_device_from_devindex((unsigned long) v - 1); |
| 64 | if (IS_ERR(device)) |
| 65 | return 0; |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 66 | if (device->block) |
| 67 | block = device->block; |
Stefan Weinhuber | a5e2383 | 2008-03-05 12:37:11 +0100 | [diff] [blame] | 68 | else { |
| 69 | dasd_put_device(device); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 70 | return 0; |
Stefan Weinhuber | a5e2383 | 2008-03-05 12:37:11 +0100 | [diff] [blame] | 71 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | /* Print device number. */ |
Kay Sievers | 2a0217d | 2008-10-10 21:33:09 +0200 | [diff] [blame] | 73 | seq_printf(m, "%s", dev_name(&device->cdev->dev)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | /* Print discipline string. */ |
Stefan Haberland | 294001a | 2010-01-27 10:12:35 +0100 | [diff] [blame^] | 75 | if (device->discipline != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | seq_printf(m, "(%s)", device->discipline->name); |
| 77 | else |
| 78 | seq_printf(m, "(none)"); |
| 79 | /* Print kdev. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 80 | if (block->gdp) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | seq_printf(m, " at (%3d:%6d)", |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 82 | MAJOR(disk_devt(block->gdp)), |
| 83 | MINOR(disk_devt(block->gdp))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | else |
| 85 | seq_printf(m, " at (???:??????)"); |
| 86 | /* Print device name. */ |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 87 | if (block->gdp) |
| 88 | seq_printf(m, " is %-8s", block->gdp->disk_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | else |
| 90 | seq_printf(m, " is ????????"); |
| 91 | /* Print devices features. */ |
Horst Hummel | c6eb7b7 | 2005-09-03 15:57:58 -0700 | [diff] [blame] | 92 | substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " "; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | seq_printf(m, "%4s: ", substr); |
| 94 | /* Print device status information. */ |
Stefan Haberland | 294001a | 2010-01-27 10:12:35 +0100 | [diff] [blame^] | 95 | switch (device->state) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | case DASD_STATE_NEW: |
| 97 | seq_printf(m, "new"); |
| 98 | break; |
| 99 | case DASD_STATE_KNOWN: |
| 100 | seq_printf(m, "detected"); |
| 101 | break; |
| 102 | case DASD_STATE_BASIC: |
| 103 | seq_printf(m, "basic"); |
| 104 | break; |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 105 | case DASD_STATE_UNFMT: |
Horst Hummel | b707dbe | 2006-03-09 17:33:52 -0800 | [diff] [blame] | 106 | seq_printf(m, "unformatted"); |
Horst Hummel | 90f0094 | 2006-03-07 21:55:39 -0800 | [diff] [blame] | 107 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | case DASD_STATE_READY: |
| 109 | case DASD_STATE_ONLINE: |
| 110 | seq_printf(m, "active "); |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 111 | if (dasd_check_blocksize(block->bp_block)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | seq_printf(m, "n/f "); |
| 113 | else |
| 114 | seq_printf(m, |
Stefan Weinhuber | b44b0ab3 | 2009-03-26 15:23:47 +0100 | [diff] [blame] | 115 | "at blocksize: %d, %lld blocks, %lld MB", |
Stefan Weinhuber | 8e09f21 | 2008-01-26 14:11:23 +0100 | [diff] [blame] | 116 | block->bp_block, block->blocks, |
| 117 | ((block->bp_block >> 9) * |
| 118 | block->blocks) >> 11); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | break; |
| 120 | default: |
| 121 | seq_printf(m, "no stat"); |
| 122 | break; |
| 123 | } |
| 124 | dasd_put_device(device); |
| 125 | if (dasd_probeonly) |
| 126 | seq_printf(m, "(probeonly)"); |
| 127 | seq_printf(m, "\n"); |
| 128 | return 0; |
| 129 | } |
| 130 | |
| 131 | static void *dasd_devices_start(struct seq_file *m, loff_t *pos) |
| 132 | { |
| 133 | if (*pos >= dasd_max_devindex) |
| 134 | return NULL; |
| 135 | return (void *)((unsigned long) *pos + 1); |
| 136 | } |
| 137 | |
| 138 | static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos) |
| 139 | { |
| 140 | ++*pos; |
| 141 | return dasd_devices_start(m, pos); |
| 142 | } |
| 143 | |
| 144 | static void dasd_devices_stop(struct seq_file *m, void *v) |
| 145 | { |
| 146 | } |
| 147 | |
Jan Engelhardt | 5c81cdb | 2008-01-26 14:11:29 +0100 | [diff] [blame] | 148 | static const struct seq_operations dasd_devices_seq_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | .start = dasd_devices_start, |
| 150 | .next = dasd_devices_next, |
| 151 | .stop = dasd_devices_stop, |
| 152 | .show = dasd_devices_show, |
| 153 | }; |
| 154 | |
| 155 | static int dasd_devices_open(struct inode *inode, struct file *file) |
| 156 | { |
| 157 | return seq_open(file, &dasd_devices_seq_ops); |
| 158 | } |
| 159 | |
Arjan van de Ven | d54b1fd | 2007-02-12 00:55:34 -0800 | [diff] [blame] | 160 | static const struct file_operations dasd_devices_file_ops = { |
Denis V. Lunev | 8b59400 | 2008-04-29 01:02:20 -0700 | [diff] [blame] | 161 | .owner = THIS_MODULE, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | .open = dasd_devices_open, |
| 163 | .read = seq_read, |
| 164 | .llseek = seq_lseek, |
| 165 | .release = seq_release, |
| 166 | }; |
| 167 | |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 168 | static int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | dasd_calc_metrics(char *page, char **start, off_t off, |
| 170 | int count, int *eof, int len) |
| 171 | { |
| 172 | len = (len > off) ? len - off : 0; |
| 173 | if (len > count) |
| 174 | len = count; |
| 175 | if (len < count) |
| 176 | *eof = 1; |
| 177 | *start = page + off; |
| 178 | return len; |
| 179 | } |
| 180 | |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 181 | #ifdef CONFIG_DASD_PROFILE |
Heiko Carstens | 4d284ca | 2007-02-05 21:18:53 +0100 | [diff] [blame] | 182 | static char * |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 183 | dasd_statistics_array(char *str, unsigned int *array, int factor) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | { |
| 185 | int i; |
| 186 | |
| 187 | for (i = 0; i < 32; i++) { |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 188 | str += sprintf(str, "%7d ", array[i] / factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | if (i == 15) |
| 190 | str += sprintf(str, "\n"); |
| 191 | } |
| 192 | str += sprintf(str,"\n"); |
| 193 | return str; |
| 194 | } |
Heiko Carstens | 3d62149 | 2007-07-10 11:24:17 +0200 | [diff] [blame] | 195 | #endif /* CONFIG_DASD_PROFILE */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | static int |
| 198 | dasd_statistics_read(char *page, char **start, off_t off, |
| 199 | int count, int *eof, void *data) |
| 200 | { |
| 201 | unsigned long len; |
| 202 | #ifdef CONFIG_DASD_PROFILE |
| 203 | struct dasd_profile_info_t *prof; |
| 204 | char *str; |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 205 | int factor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
| 207 | /* check for active profiling */ |
| 208 | if (dasd_profile_level == DASD_PROFILE_OFF) { |
| 209 | len = sprintf(page, "Statistics are off - they might be " |
| 210 | "switched on using 'echo set on > " |
| 211 | "/proc/dasd/statistics'\n"); |
| 212 | return dasd_calc_metrics(page, start, off, count, eof, len); |
| 213 | } |
| 214 | |
| 215 | prof = &dasd_global_profile; |
Uwe Kleine-König | fbfecd3 | 2009-10-28 20:11:04 +0100 | [diff] [blame] | 216 | /* prevent counter 'overflow' on output */ |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 217 | for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999; |
| 218 | factor *= 10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | |
| 220 | str = page; |
| 221 | str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 222 | str += sprintf(str, "with %u sectors(512B each)\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | prof->dasd_io_sects); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 224 | str += sprintf(str, "Scale Factor is %d\n", factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | str += sprintf(str, |
| 226 | " __<4 ___8 __16 __32 __64 _128 " |
| 227 | " _256 _512 __1k __2k __4k __8k " |
| 228 | " _16k _32k _64k 128k\n"); |
| 229 | str += sprintf(str, |
| 230 | " _256 _512 __1M __2M __4M __8M " |
| 231 | " _16M _32M _64M 128M 256M 512M " |
| 232 | " __1G __2G __4G " " _>4G\n"); |
| 233 | |
| 234 | str += sprintf(str, "Histogram of sizes (512B secs)\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 235 | str = dasd_statistics_array(str, prof->dasd_io_secs, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | str += sprintf(str, "Histogram of I/O times (microseconds)\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 237 | str = dasd_statistics_array(str, prof->dasd_io_times, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | str += sprintf(str, "Histogram of I/O times per sector\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 239 | str = dasd_statistics_array(str, prof->dasd_io_timps, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | str += sprintf(str, "Histogram of I/O time till ssch\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 241 | str = dasd_statistics_array(str, prof->dasd_io_time1, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 242 | str += sprintf(str, "Histogram of I/O time between ssch and irq\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 243 | str = dasd_statistics_array(str, prof->dasd_io_time2, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | str += sprintf(str, "Histogram of I/O time between ssch " |
| 245 | "and irq per sector\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 246 | str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | str += sprintf(str, "Histogram of I/O time between irq and end\n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 248 | str = dasd_statistics_array(str, prof->dasd_io_time3, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n"); |
Stefan Haberland | 2bf373b | 2008-12-25 13:38:51 +0100 | [diff] [blame] | 250 | str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | len = str - page; |
| 252 | #else |
| 253 | len = sprintf(page, "Statistics are not activated in this kernel\n"); |
| 254 | #endif |
| 255 | return dasd_calc_metrics(page, start, off, count, eof, len); |
| 256 | } |
| 257 | |
| 258 | static int |
| 259 | dasd_statistics_write(struct file *file, const char __user *user_buf, |
| 260 | unsigned long user_len, void *data) |
| 261 | { |
| 262 | #ifdef CONFIG_DASD_PROFILE |
| 263 | char *buffer, *str; |
| 264 | |
| 265 | if (user_len > 65536) |
| 266 | user_len = 65536; |
| 267 | buffer = dasd_get_user_string(user_buf, user_len); |
| 268 | if (IS_ERR(buffer)) |
| 269 | return PTR_ERR(buffer); |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 270 | DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | |
| 272 | /* check for valid verbs */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 273 | str = skip_spaces(buffer); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | if (strncmp(str, "set", 3) == 0 && isspace(str[3])) { |
| 275 | /* 'set xxx' was given */ |
André Goddard Rosa | e7d2860 | 2009-12-14 18:01:06 -0800 | [diff] [blame] | 276 | str = skip_spaces(str + 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | if (strcmp(str, "on") == 0) { |
| 278 | /* switch on statistics profiling */ |
| 279 | dasd_profile_level = DASD_PROFILE_ON; |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 280 | pr_info("The statistics feature has been switched " |
| 281 | "on\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | } else if (strcmp(str, "off") == 0) { |
| 283 | /* switch off and reset statistics profiling */ |
| 284 | memset(&dasd_global_profile, |
| 285 | 0, sizeof (struct dasd_profile_info_t)); |
| 286 | dasd_profile_level = DASD_PROFILE_OFF; |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 287 | pr_info("The statistics feature has been switched " |
| 288 | "off\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | } else |
| 290 | goto out_error; |
| 291 | } else if (strncmp(str, "reset", 5) == 0) { |
| 292 | /* reset the statistics */ |
| 293 | memset(&dasd_global_profile, 0, |
| 294 | sizeof (struct dasd_profile_info_t)); |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 295 | pr_info("The statistics have been reset\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | } else |
| 297 | goto out_error; |
| 298 | kfree(buffer); |
| 299 | return user_len; |
| 300 | out_error: |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 301 | pr_warning("%s is not a supported value for /proc/dasd/statistics\n", |
| 302 | str); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | kfree(buffer); |
| 304 | return -EINVAL; |
| 305 | #else |
Stefan Haberland | fc19f38 | 2009-03-26 15:23:49 +0100 | [diff] [blame] | 306 | pr_warning("/proc/dasd/statistics: is not activated in this kernel\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | return user_len; |
| 308 | #endif /* CONFIG_DASD_PROFILE */ |
| 309 | } |
| 310 | |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 311 | /* |
| 312 | * Create dasd proc-fs entries. |
| 313 | * In case creation failed, cleanup and return -ENOENT. |
| 314 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | int |
| 316 | dasd_proc_init(void) |
| 317 | { |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 318 | dasd_proc_root_entry = proc_mkdir("dasd", NULL); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 319 | if (!dasd_proc_root_entry) |
| 320 | goto out_nodasd; |
Denis V. Lunev | 8b59400 | 2008-04-29 01:02:20 -0700 | [diff] [blame] | 321 | dasd_devices_entry = proc_create("devices", |
| 322 | S_IFREG | S_IRUGO | S_IWUSR, |
| 323 | dasd_proc_root_entry, |
| 324 | &dasd_devices_file_ops); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 325 | if (!dasd_devices_entry) |
| 326 | goto out_nodevices; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | dasd_statistics_entry = create_proc_entry("statistics", |
| 328 | S_IFREG | S_IRUGO | S_IWUSR, |
| 329 | dasd_proc_root_entry); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 330 | if (!dasd_statistics_entry) |
| 331 | goto out_nostatistics; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | dasd_statistics_entry->read_proc = dasd_statistics_read; |
| 333 | dasd_statistics_entry->write_proc = dasd_statistics_write; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | return 0; |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 335 | |
| 336 | out_nostatistics: |
| 337 | remove_proc_entry("devices", dasd_proc_root_entry); |
| 338 | out_nodevices: |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 339 | remove_proc_entry("dasd", NULL); |
Horst Hummel | 7220fe8 | 2006-04-10 22:53:48 -0700 | [diff] [blame] | 340 | out_nodasd: |
| 341 | return -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | } |
| 343 | |
| 344 | void |
| 345 | dasd_proc_exit(void) |
| 346 | { |
| 347 | remove_proc_entry("devices", dasd_proc_root_entry); |
| 348 | remove_proc_entry("statistics", dasd_proc_root_entry); |
Alexey Dobriyan | c74c120 | 2008-04-29 01:01:44 -0700 | [diff] [blame] | 349 | remove_proc_entry("dasd", NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |