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-rw-r--r--block/Makefile2
-rw-r--r--block/partition-generic.c537
-rw-r--r--block/partitions/check.c523
-rw-r--r--block/partitions/check.h3
4 files changed, 542 insertions, 523 deletions
diff --git a/block/Makefile b/block/Makefile
index 3199c0cdef5a..39b76ba66ffd 100644
--- a/block/Makefile
+++ b/block/Makefile
@@ -6,7 +6,7 @@ obj-$(CONFIG_BLOCK) := elevator.o blk-core.o blk-tag.o blk-sysfs.o \
6 blk-flush.o blk-settings.o blk-ioc.o blk-map.o \ 6 blk-flush.o blk-settings.o blk-ioc.o blk-map.o \
7 blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \ 7 blk-exec.o blk-merge.o blk-softirq.o blk-timeout.o \
8 blk-iopoll.o blk-lib.o ioctl.o genhd.o scsi_ioctl.o \ 8 blk-iopoll.o blk-lib.o ioctl.o genhd.o scsi_ioctl.o \
9 partitions/ 9 partition-generic.o partitions/
10 10
11obj-$(CONFIG_BLK_DEV_BSG) += bsg.o 11obj-$(CONFIG_BLK_DEV_BSG) += bsg.o
12obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o 12obj-$(CONFIG_BLK_DEV_BSGLIB) += bsg-lib.o
diff --git a/block/partition-generic.c b/block/partition-generic.c
new file mode 100644
index 000000000000..d06ec1c829c2
--- /dev/null
+++ b/block/partition-generic.c
@@ -0,0 +1,537 @@
1/*
2 * Code extracted from drivers/block/genhd.c
3 * Copyright (C) 1991-1998 Linus Torvalds
4 * Re-organised Feb 1998 Russell King
5 *
6 * We now have independent partition support from the
7 * block drivers, which allows all the partition code to
8 * be grouped in one location, and it to be mostly self
9 * contained.
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/fs.h>
15#include <linux/slab.h>
16#include <linux/kmod.h>
17#include <linux/ctype.h>
18#include <linux/genhd.h>
19#include <linux/blktrace_api.h>
20
21#include "partitions/check.h"
22
23#ifdef CONFIG_BLK_DEV_MD
24extern void md_autodetect_dev(dev_t dev);
25#endif
26
27/*
28 * disk_name() is used by partition check code and the genhd driver.
29 * It formats the devicename of the indicated disk into
30 * the supplied buffer (of size at least 32), and returns
31 * a pointer to that same buffer (for convenience).
32 */
33
34char *disk_name(struct gendisk *hd, int partno, char *buf)
35{
36 if (!partno)
37 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
38 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
39 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
40 else
41 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
42
43 return buf;
44}
45
46const char *bdevname(struct block_device *bdev, char *buf)
47{
48 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
49}
50
51EXPORT_SYMBOL(bdevname);
52
53/*
54 * There's very little reason to use this, you should really
55 * have a struct block_device just about everywhere and use
56 * bdevname() instead.
57 */
58const char *__bdevname(dev_t dev, char *buffer)
59{
60 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
61 MAJOR(dev), MINOR(dev));
62 return buffer;
63}
64
65EXPORT_SYMBOL(__bdevname);
66
67static ssize_t part_partition_show(struct device *dev,
68 struct device_attribute *attr, char *buf)
69{
70 struct hd_struct *p = dev_to_part(dev);
71
72 return sprintf(buf, "%d\n", p->partno);
73}
74
75static ssize_t part_start_show(struct device *dev,
76 struct device_attribute *attr, char *buf)
77{
78 struct hd_struct *p = dev_to_part(dev);
79
80 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
81}
82
83ssize_t part_size_show(struct device *dev,
84 struct device_attribute *attr, char *buf)
85{
86 struct hd_struct *p = dev_to_part(dev);
87 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
88}
89
90static ssize_t part_ro_show(struct device *dev,
91 struct device_attribute *attr, char *buf)
92{
93 struct hd_struct *p = dev_to_part(dev);
94 return sprintf(buf, "%d\n", p->policy ? 1 : 0);
95}
96
97static ssize_t part_alignment_offset_show(struct device *dev,
98 struct device_attribute *attr, char *buf)
99{
100 struct hd_struct *p = dev_to_part(dev);
101 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
102}
103
104static ssize_t part_discard_alignment_show(struct device *dev,
105 struct device_attribute *attr, char *buf)
106{
107 struct hd_struct *p = dev_to_part(dev);
108 return sprintf(buf, "%u\n", p->discard_alignment);
109}
110
111ssize_t part_stat_show(struct device *dev,
112 struct device_attribute *attr, char *buf)
113{
114 struct hd_struct *p = dev_to_part(dev);
115 int cpu;
116
117 cpu = part_stat_lock();
118 part_round_stats(cpu, p);
119 part_stat_unlock();
120 return sprintf(buf,
121 "%8lu %8lu %8llu %8u "
122 "%8lu %8lu %8llu %8u "
123 "%8u %8u %8u"
124 "\n",
125 part_stat_read(p, ios[READ]),
126 part_stat_read(p, merges[READ]),
127 (unsigned long long)part_stat_read(p, sectors[READ]),
128 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
129 part_stat_read(p, ios[WRITE]),
130 part_stat_read(p, merges[WRITE]),
131 (unsigned long long)part_stat_read(p, sectors[WRITE]),
132 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
133 part_in_flight(p),
134 jiffies_to_msecs(part_stat_read(p, io_ticks)),
135 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
136}
137
138ssize_t part_inflight_show(struct device *dev,
139 struct device_attribute *attr, char *buf)
140{
141 struct hd_struct *p = dev_to_part(dev);
142
143 return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
144 atomic_read(&p->in_flight[1]));
145}
146
147#ifdef CONFIG_FAIL_MAKE_REQUEST
148ssize_t part_fail_show(struct device *dev,
149 struct device_attribute *attr, char *buf)
150{
151 struct hd_struct *p = dev_to_part(dev);
152
153 return sprintf(buf, "%d\n", p->make_it_fail);
154}
155
156ssize_t part_fail_store(struct device *dev,
157 struct device_attribute *attr,
158 const char *buf, size_t count)
159{
160 struct hd_struct *p = dev_to_part(dev);
161 int i;
162
163 if (count > 0 && sscanf(buf, "%d", &i) > 0)
164 p->make_it_fail = (i == 0) ? 0 : 1;
165
166 return count;
167}
168#endif
169
170static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
171static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
172static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
173static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
174static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
175static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
176 NULL);
177static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
178static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
179#ifdef CONFIG_FAIL_MAKE_REQUEST
180static struct device_attribute dev_attr_fail =
181 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
182#endif
183
184static struct attribute *part_attrs[] = {
185 &dev_attr_partition.attr,
186 &dev_attr_start.attr,
187 &dev_attr_size.attr,
188 &dev_attr_ro.attr,
189 &dev_attr_alignment_offset.attr,
190 &dev_attr_discard_alignment.attr,
191 &dev_attr_stat.attr,
192 &dev_attr_inflight.attr,
193#ifdef CONFIG_FAIL_MAKE_REQUEST
194 &dev_attr_fail.attr,
195#endif
196 NULL
197};
198
199static struct attribute_group part_attr_group = {
200 .attrs = part_attrs,
201};
202
203static const struct attribute_group *part_attr_groups[] = {
204 &part_attr_group,
205#ifdef CONFIG_BLK_DEV_IO_TRACE
206 &blk_trace_attr_group,
207#endif
208 NULL
209};
210
211static void part_release(struct device *dev)
212{
213 struct hd_struct *p = dev_to_part(dev);
214 free_part_stats(p);
215 free_part_info(p);
216 kfree(p);
217}
218
219struct device_type part_type = {
220 .name = "partition",
221 .groups = part_attr_groups,
222 .release = part_release,
223};
224
225static void delete_partition_rcu_cb(struct rcu_head *head)
226{
227 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
228
229 part->start_sect = 0;
230 part->nr_sects = 0;
231 part_stat_set_all(part, 0);
232 put_device(part_to_dev(part));
233}
234
235void __delete_partition(struct hd_struct *part)
236{
237 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
238}
239
240void delete_partition(struct gendisk *disk, int partno)
241{
242 struct disk_part_tbl *ptbl = disk->part_tbl;
243 struct hd_struct *part;
244
245 if (partno >= ptbl->len)
246 return;
247
248 part = ptbl->part[partno];
249 if (!part)
250 return;
251
252 blk_free_devt(part_devt(part));
253 rcu_assign_pointer(ptbl->part[partno], NULL);
254 rcu_assign_pointer(ptbl->last_lookup, NULL);
255 kobject_put(part->holder_dir);
256 device_del(part_to_dev(part));
257
258 hd_struct_put(part);
259}
260
261static ssize_t whole_disk_show(struct device *dev,
262 struct device_attribute *attr, char *buf)
263{
264 return 0;
265}
266static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
267 whole_disk_show, NULL);
268
269struct hd_struct *add_partition(struct gendisk *disk, int partno,
270 sector_t start, sector_t len, int flags,
271 struct partition_meta_info *info)
272{
273 struct hd_struct *p;
274 dev_t devt = MKDEV(0, 0);
275 struct device *ddev = disk_to_dev(disk);
276 struct device *pdev;
277 struct disk_part_tbl *ptbl;
278 const char *dname;
279 int err;
280
281 err = disk_expand_part_tbl(disk, partno);
282 if (err)
283 return ERR_PTR(err);
284 ptbl = disk->part_tbl;
285
286 if (ptbl->part[partno])
287 return ERR_PTR(-EBUSY);
288
289 p = kzalloc(sizeof(*p), GFP_KERNEL);
290 if (!p)
291 return ERR_PTR(-EBUSY);
292
293 if (!init_part_stats(p)) {
294 err = -ENOMEM;
295 goto out_free;
296 }
297 pdev = part_to_dev(p);
298
299 p->start_sect = start;
300 p->alignment_offset =
301 queue_limit_alignment_offset(&disk->queue->limits, start);
302 p->discard_alignment =
303 queue_limit_discard_alignment(&disk->queue->limits, start);
304 p->nr_sects = len;
305 p->partno = partno;
306 p->policy = get_disk_ro(disk);
307
308 if (info) {
309 struct partition_meta_info *pinfo = alloc_part_info(disk);
310 if (!pinfo)
311 goto out_free_stats;
312 memcpy(pinfo, info, sizeof(*info));
313 p->info = pinfo;
314 }
315
316 dname = dev_name(ddev);
317 if (isdigit(dname[strlen(dname) - 1]))
318 dev_set_name(pdev, "%sp%d", dname, partno);
319 else
320 dev_set_name(pdev, "%s%d", dname, partno);
321
322 device_initialize(pdev);
323 pdev->class = &block_class;
324 pdev->type = &part_type;
325 pdev->parent = ddev;
326
327 err = blk_alloc_devt(p, &devt);
328 if (err)
329 goto out_free_info;
330 pdev->devt = devt;
331
332 /* delay uevent until 'holders' subdir is created */
333 dev_set_uevent_suppress(pdev, 1);
334 err = device_add(pdev);
335 if (err)
336 goto out_put;
337
338 err = -ENOMEM;
339 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
340 if (!p->holder_dir)
341 goto out_del;
342
343 dev_set_uevent_suppress(pdev, 0);
344 if (flags & ADDPART_FLAG_WHOLEDISK) {
345 err = device_create_file(pdev, &dev_attr_whole_disk);
346 if (err)
347 goto out_del;
348 }
349
350 /* everything is up and running, commence */
351 rcu_assign_pointer(ptbl->part[partno], p);
352
353 /* suppress uevent if the disk suppresses it */
354 if (!dev_get_uevent_suppress(ddev))
355 kobject_uevent(&pdev->kobj, KOBJ_ADD);
356
357 hd_ref_init(p);
358 return p;
359
360out_free_info:
361 free_part_info(p);
362out_free_stats:
363 free_part_stats(p);
364out_free:
365 kfree(p);
366 return ERR_PTR(err);
367out_del:
368 kobject_put(p->holder_dir);
369 device_del(pdev);
370out_put:
371 put_device(pdev);
372 blk_free_devt(devt);
373 return ERR_PTR(err);
374}
375
376static bool disk_unlock_native_capacity(struct gendisk *disk)
377{
378 const struct block_device_operations *bdops = disk->fops;
379
380 if (bdops->unlock_native_capacity &&
381 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
382 printk(KERN_CONT "enabling native capacity\n");
383 bdops->unlock_native_capacity(disk);
384 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
385 return true;
386 } else {
387 printk(KERN_CONT "truncated\n");
388 return false;
389 }
390}
391
392int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
393{
394 struct parsed_partitions *state = NULL;
395 struct disk_part_iter piter;
396 struct hd_struct *part;
397 int p, highest, res;
398rescan:
399 if (state && !IS_ERR(state)) {
400 kfree(state);
401 state = NULL;
402 }
403
404 if (bdev->bd_part_count)
405 return -EBUSY;
406 res = invalidate_partition(disk, 0);
407 if (res)
408 return res;
409
410 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
411 while ((part = disk_part_iter_next(&piter)))
412 delete_partition(disk, part->partno);
413 disk_part_iter_exit(&piter);
414
415 if (disk->fops->revalidate_disk)
416 disk->fops->revalidate_disk(disk);
417 check_disk_size_change(disk, bdev);
418 bdev->bd_invalidated = 0;
419 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
420 return 0;
421 if (IS_ERR(state)) {
422 /*
423 * I/O error reading the partition table. If any
424 * partition code tried to read beyond EOD, retry
425 * after unlocking native capacity.
426 */
427 if (PTR_ERR(state) == -ENOSPC) {
428 printk(KERN_WARNING "%s: partition table beyond EOD, ",
429 disk->disk_name);
430 if (disk_unlock_native_capacity(disk))
431 goto rescan;
432 }
433 return -EIO;
434 }
435 /*
436 * If any partition code tried to read beyond EOD, try
437 * unlocking native capacity even if partition table is
438 * successfully read as we could be missing some partitions.
439 */
440 if (state->access_beyond_eod) {
441 printk(KERN_WARNING
442 "%s: partition table partially beyond EOD, ",
443 disk->disk_name);
444 if (disk_unlock_native_capacity(disk))
445 goto rescan;
446 }
447
448 /* tell userspace that the media / partition table may have changed */
449 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
450
451 /* Detect the highest partition number and preallocate
452 * disk->part_tbl. This is an optimization and not strictly
453 * necessary.
454 */
455 for (p = 1, highest = 0; p < state->limit; p++)
456 if (state->parts[p].size)
457 highest = p;
458
459 disk_expand_part_tbl(disk, highest);
460
461 /* add partitions */
462 for (p = 1; p < state->limit; p++) {
463 sector_t size, from;
464 struct partition_meta_info *info = NULL;
465
466 size = state->parts[p].size;
467 if (!size)
468 continue;
469
470 from = state->parts[p].from;
471 if (from >= get_capacity(disk)) {
472 printk(KERN_WARNING
473 "%s: p%d start %llu is beyond EOD, ",
474 disk->disk_name, p, (unsigned long long) from);
475 if (disk_unlock_native_capacity(disk))
476 goto rescan;
477 continue;
478 }
479
480 if (from + size > get_capacity(disk)) {
481 printk(KERN_WARNING
482 "%s: p%d size %llu extends beyond EOD, ",
483 disk->disk_name, p, (unsigned long long) size);
484
485 if (disk_unlock_native_capacity(disk)) {
486 /* free state and restart */
487 goto rescan;
488 } else {
489 /*
490 * we can not ignore partitions of broken tables
491 * created by for example camera firmware, but
492 * we limit them to the end of the disk to avoid
493 * creating invalid block devices
494 */
495 size = get_capacity(disk) - from;
496 }
497 }
498
499 if (state->parts[p].has_info)
500 info = &state->parts[p].info;
501 part = add_partition(disk, p, from, size,
502 state->parts[p].flags,
503 &state->parts[p].info);
504 if (IS_ERR(part)) {
505 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
506 disk->disk_name, p, -PTR_ERR(part));
507 continue;
508 }
509#ifdef CONFIG_BLK_DEV_MD
510 if (state->parts[p].flags & ADDPART_FLAG_RAID)
511 md_autodetect_dev(part_to_dev(part)->devt);
512#endif
513 }
514 kfree(state);
515 return 0;
516}
517
518unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
519{
520 struct address_space *mapping = bdev->bd_inode->i_mapping;
521 struct page *page;
522
523 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
524 NULL);
525 if (!IS_ERR(page)) {
526 if (PageError(page))
527 goto fail;
528 p->v = page;
529 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
530fail:
531 page_cache_release(page);
532 }
533 p->v = NULL;
534 return NULL;
535}
536
537EXPORT_SYMBOL(read_dev_sector);
diff --git a/block/partitions/check.c b/block/partitions/check.c
index e3c63d1c5e13..bc908672c976 100644
--- a/block/partitions/check.c
+++ b/block/partitions/check.c
@@ -13,14 +13,9 @@
13 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl} 13 * Added needed MAJORS for new pairs, {hdi,hdj}, {hdk,hdl}
14 */ 14 */
15 15
16#include <linux/init.h>
17#include <linux/module.h>
18#include <linux/fs.h>
19#include <linux/slab.h> 16#include <linux/slab.h>
20#include <linux/kmod.h>
21#include <linux/ctype.h> 17#include <linux/ctype.h>
22#include <linux/genhd.h> 18#include <linux/genhd.h>
23#include <linux/blktrace_api.h>
24 19
25#include "check.h" 20#include "check.h"
26 21
@@ -39,10 +34,6 @@
39#include "karma.h" 34#include "karma.h"
40#include "sysv68.h" 35#include "sysv68.h"
41 36
42#ifdef CONFIG_BLK_DEV_MD
43extern void md_autodetect_dev(dev_t dev);
44#endif
45
46int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/ 37int warn_no_part = 1; /*This is ugly: should make genhd removable media aware*/
47 38
48static int (*check_part[])(struct parsed_partitions *) = { 39static int (*check_part[])(struct parsed_partitions *) = {
@@ -114,48 +105,8 @@ static int (*check_part[])(struct parsed_partitions *) = {
114#endif 105#endif
115 NULL 106 NULL
116}; 107};
117
118/*
119 * disk_name() is used by partition check code and the genhd driver.
120 * It formats the devicename of the indicated disk into
121 * the supplied buffer (of size at least 32), and returns
122 * a pointer to that same buffer (for convenience).
123 */
124
125char *disk_name(struct gendisk *hd, int partno, char *buf)
126{
127 if (!partno)
128 snprintf(buf, BDEVNAME_SIZE, "%s", hd->disk_name);
129 else if (isdigit(hd->disk_name[strlen(hd->disk_name)-1]))
130 snprintf(buf, BDEVNAME_SIZE, "%sp%d", hd->disk_name, partno);
131 else
132 snprintf(buf, BDEVNAME_SIZE, "%s%d", hd->disk_name, partno);
133
134 return buf;
135}
136
137const char *bdevname(struct block_device *bdev, char *buf)
138{
139 return disk_name(bdev->bd_disk, bdev->bd_part->partno, buf);
140}
141
142EXPORT_SYMBOL(bdevname);
143
144/*
145 * There's very little reason to use this, you should really
146 * have a struct block_device just about everywhere and use
147 * bdevname() instead.
148 */
149const char *__bdevname(dev_t dev, char *buffer)
150{
151 scnprintf(buffer, BDEVNAME_SIZE, "unknown-block(%u,%u)",
152 MAJOR(dev), MINOR(dev));
153 return buffer;
154}
155
156EXPORT_SYMBOL(__bdevname);
157 108
158static struct parsed_partitions * 109struct parsed_partitions *
159check_partition(struct gendisk *hd, struct block_device *bdev) 110check_partition(struct gendisk *hd, struct block_device *bdev)
160{ 111{
161 struct parsed_partitions *state; 112 struct parsed_partitions *state;
@@ -213,475 +164,3 @@ check_partition(struct gendisk *hd, struct block_device *bdev)
213 kfree(state); 164 kfree(state);
214 return ERR_PTR(res); 165 return ERR_PTR(res);
215} 166}
216
217static ssize_t part_partition_show(struct device *dev,
218 struct device_attribute *attr, char *buf)
219{
220 struct hd_struct *p = dev_to_part(dev);
221
222 return sprintf(buf, "%d\n", p->partno);
223}
224
225static ssize_t part_start_show(struct device *dev,
226 struct device_attribute *attr, char *buf)
227{
228 struct hd_struct *p = dev_to_part(dev);
229
230 return sprintf(buf, "%llu\n",(unsigned long long)p->start_sect);
231}
232
233ssize_t part_size_show(struct device *dev,
234 struct device_attribute *attr, char *buf)
235{
236 struct hd_struct *p = dev_to_part(dev);
237 return sprintf(buf, "%llu\n",(unsigned long long)p->nr_sects);
238}
239
240static ssize_t part_ro_show(struct device *dev,
241 struct device_attribute *attr, char *buf)
242{
243 struct hd_struct *p = dev_to_part(dev);
244 return sprintf(buf, "%d\n", p->policy ? 1 : 0);
245}
246
247static ssize_t part_alignment_offset_show(struct device *dev,
248 struct device_attribute *attr, char *buf)
249{
250 struct hd_struct *p = dev_to_part(dev);
251 return sprintf(buf, "%llu\n", (unsigned long long)p->alignment_offset);
252}
253
254static ssize_t part_discard_alignment_show(struct device *dev,
255 struct device_attribute *attr, char *buf)
256{
257 struct hd_struct *p = dev_to_part(dev);
258 return sprintf(buf, "%u\n", p->discard_alignment);
259}
260
261ssize_t part_stat_show(struct device *dev,
262 struct device_attribute *attr, char *buf)
263{
264 struct hd_struct *p = dev_to_part(dev);
265 int cpu;
266
267 cpu = part_stat_lock();
268 part_round_stats(cpu, p);
269 part_stat_unlock();
270 return sprintf(buf,
271 "%8lu %8lu %8llu %8u "
272 "%8lu %8lu %8llu %8u "
273 "%8u %8u %8u"
274 "\n",
275 part_stat_read(p, ios[READ]),
276 part_stat_read(p, merges[READ]),
277 (unsigned long long)part_stat_read(p, sectors[READ]),
278 jiffies_to_msecs(part_stat_read(p, ticks[READ])),
279 part_stat_read(p, ios[WRITE]),
280 part_stat_read(p, merges[WRITE]),
281 (unsigned long long)part_stat_read(p, sectors[WRITE]),
282 jiffies_to_msecs(part_stat_read(p, ticks[WRITE])),
283 part_in_flight(p),
284 jiffies_to_msecs(part_stat_read(p, io_ticks)),
285 jiffies_to_msecs(part_stat_read(p, time_in_queue)));
286}
287
288ssize_t part_inflight_show(struct device *dev,
289 struct device_attribute *attr, char *buf)
290{
291 struct hd_struct *p = dev_to_part(dev);
292
293 return sprintf(buf, "%8u %8u\n", atomic_read(&p->in_flight[0]),
294 atomic_read(&p->in_flight[1]));
295}
296
297#ifdef CONFIG_FAIL_MAKE_REQUEST
298ssize_t part_fail_show(struct device *dev,
299 struct device_attribute *attr, char *buf)
300{
301 struct hd_struct *p = dev_to_part(dev);
302
303 return sprintf(buf, "%d\n", p->make_it_fail);
304}
305
306ssize_t part_fail_store(struct device *dev,
307 struct device_attribute *attr,
308 const char *buf, size_t count)
309{
310 struct hd_struct *p = dev_to_part(dev);
311 int i;
312
313 if (count > 0 && sscanf(buf, "%d", &i) > 0)
314 p->make_it_fail = (i == 0) ? 0 : 1;
315
316 return count;
317}
318#endif
319
320static DEVICE_ATTR(partition, S_IRUGO, part_partition_show, NULL);
321static DEVICE_ATTR(start, S_IRUGO, part_start_show, NULL);
322static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL);
323static DEVICE_ATTR(ro, S_IRUGO, part_ro_show, NULL);
324static DEVICE_ATTR(alignment_offset, S_IRUGO, part_alignment_offset_show, NULL);
325static DEVICE_ATTR(discard_alignment, S_IRUGO, part_discard_alignment_show,
326 NULL);
327static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL);
328static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL);
329#ifdef CONFIG_FAIL_MAKE_REQUEST
330static struct device_attribute dev_attr_fail =
331 __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store);
332#endif
333
334static struct attribute *part_attrs[] = {
335 &dev_attr_partition.attr,
336 &dev_attr_start.attr,
337 &dev_attr_size.attr,
338 &dev_attr_ro.attr,
339 &dev_attr_alignment_offset.attr,
340 &dev_attr_discard_alignment.attr,
341 &dev_attr_stat.attr,
342 &dev_attr_inflight.attr,
343#ifdef CONFIG_FAIL_MAKE_REQUEST
344 &dev_attr_fail.attr,
345#endif
346 NULL
347};
348
349static struct attribute_group part_attr_group = {
350 .attrs = part_attrs,
351};
352
353static const struct attribute_group *part_attr_groups[] = {
354 &part_attr_group,
355#ifdef CONFIG_BLK_DEV_IO_TRACE
356 &blk_trace_attr_group,
357#endif
358 NULL
359};
360
361static void part_release(struct device *dev)
362{
363 struct hd_struct *p = dev_to_part(dev);
364 free_part_stats(p);
365 free_part_info(p);
366 kfree(p);
367}
368
369struct device_type part_type = {
370 .name = "partition",
371 .groups = part_attr_groups,
372 .release = part_release,
373};
374
375static void delete_partition_rcu_cb(struct rcu_head *head)
376{
377 struct hd_struct *part = container_of(head, struct hd_struct, rcu_head);
378
379 part->start_sect = 0;
380 part->nr_sects = 0;
381 part_stat_set_all(part, 0);
382 put_device(part_to_dev(part));
383}
384
385void __delete_partition(struct hd_struct *part)
386{
387 call_rcu(&part->rcu_head, delete_partition_rcu_cb);
388}
389
390void delete_partition(struct gendisk *disk, int partno)
391{
392 struct disk_part_tbl *ptbl = disk->part_tbl;
393 struct hd_struct *part;
394
395 if (partno >= ptbl->len)
396 return;
397
398 part = ptbl->part[partno];
399 if (!part)
400 return;
401
402 blk_free_devt(part_devt(part));
403 rcu_assign_pointer(ptbl->part[partno], NULL);
404 rcu_assign_pointer(ptbl->last_lookup, NULL);
405 kobject_put(part->holder_dir);
406 device_del(part_to_dev(part));
407
408 hd_struct_put(part);
409}
410
411static ssize_t whole_disk_show(struct device *dev,
412 struct device_attribute *attr, char *buf)
413{
414 return 0;
415}
416static DEVICE_ATTR(whole_disk, S_IRUSR | S_IRGRP | S_IROTH,
417 whole_disk_show, NULL);
418
419struct hd_struct *add_partition(struct gendisk *disk, int partno,
420 sector_t start, sector_t len, int flags,
421 struct partition_meta_info *info)
422{
423 struct hd_struct *p;
424 dev_t devt = MKDEV(0, 0);
425 struct device *ddev = disk_to_dev(disk);
426 struct device *pdev;
427 struct disk_part_tbl *ptbl;
428 const char *dname;
429 int err;
430
431 err = disk_expand_part_tbl(disk, partno);
432 if (err)
433 return ERR_PTR(err);
434 ptbl = disk->part_tbl;
435
436 if (ptbl->part[partno])
437 return ERR_PTR(-EBUSY);
438
439 p = kzalloc(sizeof(*p), GFP_KERNEL);
440 if (!p)
441 return ERR_PTR(-EBUSY);
442
443 if (!init_part_stats(p)) {
444 err = -ENOMEM;
445 goto out_free;
446 }
447 pdev = part_to_dev(p);
448
449 p->start_sect = start;
450 p->alignment_offset =
451 queue_limit_alignment_offset(&disk->queue->limits, start);
452 p->discard_alignment =
453 queue_limit_discard_alignment(&disk->queue->limits, start);
454 p->nr_sects = len;
455 p->partno = partno;
456 p->policy = get_disk_ro(disk);
457
458 if (info) {
459 struct partition_meta_info *pinfo = alloc_part_info(disk);
460 if (!pinfo)
461 goto out_free_stats;
462 memcpy(pinfo, info, sizeof(*info));
463 p->info = pinfo;
464 }
465
466 dname = dev_name(ddev);
467 if (isdigit(dname[strlen(dname) - 1]))
468 dev_set_name(pdev, "%sp%d", dname, partno);
469 else
470 dev_set_name(pdev, "%s%d", dname, partno);
471
472 device_initialize(pdev);
473 pdev->class = &block_class;
474 pdev->type = &part_type;
475 pdev->parent = ddev;
476
477 err = blk_alloc_devt(p, &devt);
478 if (err)
479 goto out_free_info;
480 pdev->devt = devt;
481
482 /* delay uevent until 'holders' subdir is created */
483 dev_set_uevent_suppress(pdev, 1);
484 err = device_add(pdev);
485 if (err)
486 goto out_put;
487
488 err = -ENOMEM;
489 p->holder_dir = kobject_create_and_add("holders", &pdev->kobj);
490 if (!p->holder_dir)
491 goto out_del;
492
493 dev_set_uevent_suppress(pdev, 0);
494 if (flags & ADDPART_FLAG_WHOLEDISK) {
495 err = device_create_file(pdev, &dev_attr_whole_disk);
496 if (err)
497 goto out_del;
498 }
499
500 /* everything is up and running, commence */
501 rcu_assign_pointer(ptbl->part[partno], p);
502
503 /* suppress uevent if the disk suppresses it */
504 if (!dev_get_uevent_suppress(ddev))
505 kobject_uevent(&pdev->kobj, KOBJ_ADD);
506
507 hd_ref_init(p);
508 return p;
509
510out_free_info:
511 free_part_info(p);
512out_free_stats:
513 free_part_stats(p);
514out_free:
515 kfree(p);
516 return ERR_PTR(err);
517out_del:
518 kobject_put(p->holder_dir);
519 device_del(pdev);
520out_put:
521 put_device(pdev);
522 blk_free_devt(devt);
523 return ERR_PTR(err);
524}
525
526static bool disk_unlock_native_capacity(struct gendisk *disk)
527{
528 const struct block_device_operations *bdops = disk->fops;
529
530 if (bdops->unlock_native_capacity &&
531 !(disk->flags & GENHD_FL_NATIVE_CAPACITY)) {
532 printk(KERN_CONT "enabling native capacity\n");
533 bdops->unlock_native_capacity(disk);
534 disk->flags |= GENHD_FL_NATIVE_CAPACITY;
535 return true;
536 } else {
537 printk(KERN_CONT "truncated\n");
538 return false;
539 }
540}
541
542int rescan_partitions(struct gendisk *disk, struct block_device *bdev)
543{
544 struct parsed_partitions *state = NULL;
545 struct disk_part_iter piter;
546 struct hd_struct *part;
547 int p, highest, res;
548rescan:
549 if (state && !IS_ERR(state)) {
550 kfree(state);
551 state = NULL;
552 }
553
554 if (bdev->bd_part_count)
555 return -EBUSY;
556 res = invalidate_partition(disk, 0);
557 if (res)
558 return res;
559
560 disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY);
561 while ((part = disk_part_iter_next(&piter)))
562 delete_partition(disk, part->partno);
563 disk_part_iter_exit(&piter);
564
565 if (disk->fops->revalidate_disk)
566 disk->fops->revalidate_disk(disk);
567 check_disk_size_change(disk, bdev);
568 bdev->bd_invalidated = 0;
569 if (!get_capacity(disk) || !(state = check_partition(disk, bdev)))
570 return 0;
571 if (IS_ERR(state)) {
572 /*
573 * I/O error reading the partition table. If any
574 * partition code tried to read beyond EOD, retry
575 * after unlocking native capacity.
576 */
577 if (PTR_ERR(state) == -ENOSPC) {
578 printk(KERN_WARNING "%s: partition table beyond EOD, ",
579 disk->disk_name);
580 if (disk_unlock_native_capacity(disk))
581 goto rescan;
582 }
583 return -EIO;
584 }
585 /*
586 * If any partition code tried to read beyond EOD, try
587 * unlocking native capacity even if partition table is
588 * successfully read as we could be missing some partitions.
589 */
590 if (state->access_beyond_eod) {
591 printk(KERN_WARNING
592 "%s: partition table partially beyond EOD, ",
593 disk->disk_name);
594 if (disk_unlock_native_capacity(disk))
595 goto rescan;
596 }
597
598 /* tell userspace that the media / partition table may have changed */
599 kobject_uevent(&disk_to_dev(disk)->kobj, KOBJ_CHANGE);
600
601 /* Detect the highest partition number and preallocate
602 * disk->part_tbl. This is an optimization and not strictly
603 * necessary.
604 */
605 for (p = 1, highest = 0; p < state->limit; p++)
606 if (state->parts[p].size)
607 highest = p;
608
609 disk_expand_part_tbl(disk, highest);
610
611 /* add partitions */
612 for (p = 1; p < state->limit; p++) {
613 sector_t size, from;
614 struct partition_meta_info *info = NULL;
615
616 size = state->parts[p].size;
617 if (!size)
618 continue;
619
620 from = state->parts[p].from;
621 if (from >= get_capacity(disk)) {
622 printk(KERN_WARNING
623 "%s: p%d start %llu is beyond EOD, ",
624 disk->disk_name, p, (unsigned long long) from);
625 if (disk_unlock_native_capacity(disk))
626 goto rescan;
627 continue;
628 }
629
630 if (from + size > get_capacity(disk)) {
631 printk(KERN_WARNING
632 "%s: p%d size %llu extends beyond EOD, ",
633 disk->disk_name, p, (unsigned long long) size);
634
635 if (disk_unlock_native_capacity(disk)) {
636 /* free state and restart */
637 goto rescan;
638 } else {
639 /*
640 * we can not ignore partitions of broken tables
641 * created by for example camera firmware, but
642 * we limit them to the end of the disk to avoid
643 * creating invalid block devices
644 */
645 size = get_capacity(disk) - from;
646 }
647 }
648
649 if (state->parts[p].has_info)
650 info = &state->parts[p].info;
651 part = add_partition(disk, p, from, size,
652 state->parts[p].flags,
653 &state->parts[p].info);
654 if (IS_ERR(part)) {
655 printk(KERN_ERR " %s: p%d could not be added: %ld\n",
656 disk->disk_name, p, -PTR_ERR(part));
657 continue;
658 }
659#ifdef CONFIG_BLK_DEV_MD
660 if (state->parts[p].flags & ADDPART_FLAG_RAID)
661 md_autodetect_dev(part_to_dev(part)->devt);
662#endif
663 }
664 kfree(state);
665 return 0;
666}
667
668unsigned char *read_dev_sector(struct block_device *bdev, sector_t n, Sector *p)
669{
670 struct address_space *mapping = bdev->bd_inode->i_mapping;
671 struct page *page;
672
673 page = read_mapping_page(mapping, (pgoff_t)(n >> (PAGE_CACHE_SHIFT-9)),
674 NULL);
675 if (!IS_ERR(page)) {
676 if (PageError(page))
677 goto fail;
678 p->v = page;
679 return (unsigned char *)page_address(page) + ((n & ((1 << (PAGE_CACHE_SHIFT - 9)) - 1)) << 9);
680fail:
681 page_cache_release(page);
682 }
683 p->v = NULL;
684 return NULL;
685}
686
687EXPORT_SYMBOL(read_dev_sector);
diff --git a/block/partitions/check.h b/block/partitions/check.h
index d68bf4dc3bc2..52b100311ec3 100644
--- a/block/partitions/check.h
+++ b/block/partitions/check.h
@@ -22,6 +22,9 @@ struct parsed_partitions {
22 char *pp_buf; 22 char *pp_buf;
23}; 23};
24 24
25struct parsed_partitions *
26check_partition(struct gendisk *, struct block_device *);
27
25static inline void *read_part_sector(struct parsed_partitions *state, 28static inline void *read_part_sector(struct parsed_partitions *state,
26 sector_t n, Sector *p) 29 sector_t n, Sector *p)
27{ 30{
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-29 13:00:32 -0500