Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * gendisk handling |
| 3 | */ |
| 4 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/module.h> |
| 6 | #include <linux/fs.h> |
| 7 | #include <linux/genhd.h> |
Andrew Morton | b446b60 | 2007-02-20 13:57:48 -0800 | [diff] [blame] | 8 | #include <linux/kdev_t.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/kernel.h> |
| 10 | #include <linux/blkdev.h> |
| 11 | #include <linux/init.h> |
| 12 | #include <linux/spinlock.h> |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 13 | #include <linux/proc_fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/seq_file.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/kmod.h> |
| 17 | #include <linux/kobj_map.h> |
Christoph Hellwig | 2ef4163 | 2005-05-05 16:15:59 -0700 | [diff] [blame] | 18 | #include <linux/buffer_head.h> |
Jes Sorensen | 58383af | 2006-02-06 14:12:43 -0800 | [diff] [blame] | 19 | #include <linux/mutex.h> |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 20 | #include <linux/idr.h> |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 21 | #include <linux/log2.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | |
Adrian Bunk | ff88972 | 2008-03-04 11:23:45 +0100 | [diff] [blame] | 23 | #include "blk.h" |
| 24 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 25 | static DEFINE_MUTEX(block_class_lock); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 26 | struct kobject *block_depr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 28 | /* for extended dynamic devt allocation, currently only one major is used */ |
| 29 | #define MAX_EXT_DEVT (1 << MINORBITS) |
| 30 | |
| 31 | /* For extended devt allocation. ext_devt_mutex prevents look up |
| 32 | * results from going away underneath its user. |
| 33 | */ |
| 34 | static DEFINE_MUTEX(ext_devt_mutex); |
| 35 | static DEFINE_IDR(ext_devt_idr); |
| 36 | |
Adrian Bunk | 1826ead | 2008-03-04 11:23:46 +0100 | [diff] [blame] | 37 | static struct device_type disk_type; |
| 38 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 39 | static void disk_add_events(struct gendisk *disk); |
| 40 | static void disk_del_events(struct gendisk *disk); |
| 41 | static void disk_release_events(struct gendisk *disk); |
| 42 | |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 43 | /** |
| 44 | * disk_get_part - get partition |
| 45 | * @disk: disk to look partition from |
| 46 | * @partno: partition number |
| 47 | * |
| 48 | * Look for partition @partno from @disk. If found, increment |
| 49 | * reference count and return it. |
| 50 | * |
| 51 | * CONTEXT: |
| 52 | * Don't care. |
| 53 | * |
| 54 | * RETURNS: |
| 55 | * Pointer to the found partition on success, NULL if not found. |
| 56 | */ |
| 57 | struct hd_struct *disk_get_part(struct gendisk *disk, int partno) |
| 58 | { |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 59 | struct hd_struct *part = NULL; |
| 60 | struct disk_part_tbl *ptbl; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 61 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 62 | if (unlikely(partno < 0)) |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 63 | return NULL; |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 64 | |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 65 | rcu_read_lock(); |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 66 | |
| 67 | ptbl = rcu_dereference(disk->part_tbl); |
| 68 | if (likely(partno < ptbl->len)) { |
| 69 | part = rcu_dereference(ptbl->part[partno]); |
| 70 | if (part) |
| 71 | get_device(part_to_dev(part)); |
| 72 | } |
| 73 | |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 74 | rcu_read_unlock(); |
| 75 | |
| 76 | return part; |
| 77 | } |
| 78 | EXPORT_SYMBOL_GPL(disk_get_part); |
| 79 | |
| 80 | /** |
| 81 | * disk_part_iter_init - initialize partition iterator |
| 82 | * @piter: iterator to initialize |
| 83 | * @disk: disk to iterate over |
| 84 | * @flags: DISK_PITER_* flags |
| 85 | * |
| 86 | * Initialize @piter so that it iterates over partitions of @disk. |
| 87 | * |
| 88 | * CONTEXT: |
| 89 | * Don't care. |
| 90 | */ |
| 91 | void disk_part_iter_init(struct disk_part_iter *piter, struct gendisk *disk, |
| 92 | unsigned int flags) |
| 93 | { |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 94 | struct disk_part_tbl *ptbl; |
| 95 | |
| 96 | rcu_read_lock(); |
| 97 | ptbl = rcu_dereference(disk->part_tbl); |
| 98 | |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 99 | piter->disk = disk; |
| 100 | piter->part = NULL; |
| 101 | |
| 102 | if (flags & DISK_PITER_REVERSE) |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 103 | piter->idx = ptbl->len - 1; |
Tejun Heo | 71982a4 | 2009-04-17 08:34:48 +0200 | [diff] [blame] | 104 | else if (flags & (DISK_PITER_INCL_PART0 | DISK_PITER_INCL_EMPTY_PART0)) |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 105 | piter->idx = 0; |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 106 | else |
| 107 | piter->idx = 1; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 108 | |
| 109 | piter->flags = flags; |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 110 | |
| 111 | rcu_read_unlock(); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 112 | } |
| 113 | EXPORT_SYMBOL_GPL(disk_part_iter_init); |
| 114 | |
| 115 | /** |
| 116 | * disk_part_iter_next - proceed iterator to the next partition and return it |
| 117 | * @piter: iterator of interest |
| 118 | * |
| 119 | * Proceed @piter to the next partition and return it. |
| 120 | * |
| 121 | * CONTEXT: |
| 122 | * Don't care. |
| 123 | */ |
| 124 | struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter) |
| 125 | { |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 126 | struct disk_part_tbl *ptbl; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 127 | int inc, end; |
| 128 | |
| 129 | /* put the last partition */ |
| 130 | disk_put_part(piter->part); |
| 131 | piter->part = NULL; |
| 132 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 133 | /* get part_tbl */ |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 134 | rcu_read_lock(); |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 135 | ptbl = rcu_dereference(piter->disk->part_tbl); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 136 | |
| 137 | /* determine iteration parameters */ |
| 138 | if (piter->flags & DISK_PITER_REVERSE) { |
| 139 | inc = -1; |
Tejun Heo | 71982a4 | 2009-04-17 08:34:48 +0200 | [diff] [blame] | 140 | if (piter->flags & (DISK_PITER_INCL_PART0 | |
| 141 | DISK_PITER_INCL_EMPTY_PART0)) |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 142 | end = -1; |
| 143 | else |
| 144 | end = 0; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 145 | } else { |
| 146 | inc = 1; |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 147 | end = ptbl->len; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 148 | } |
| 149 | |
| 150 | /* iterate to the next partition */ |
| 151 | for (; piter->idx != end; piter->idx += inc) { |
| 152 | struct hd_struct *part; |
| 153 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 154 | part = rcu_dereference(ptbl->part[piter->idx]); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 155 | if (!part) |
| 156 | continue; |
Tejun Heo | 71982a4 | 2009-04-17 08:34:48 +0200 | [diff] [blame] | 157 | if (!part->nr_sects && |
| 158 | !(piter->flags & DISK_PITER_INCL_EMPTY) && |
| 159 | !(piter->flags & DISK_PITER_INCL_EMPTY_PART0 && |
| 160 | piter->idx == 0)) |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 161 | continue; |
| 162 | |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 163 | get_device(part_to_dev(part)); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 164 | piter->part = part; |
| 165 | piter->idx += inc; |
| 166 | break; |
| 167 | } |
| 168 | |
| 169 | rcu_read_unlock(); |
| 170 | |
| 171 | return piter->part; |
| 172 | } |
| 173 | EXPORT_SYMBOL_GPL(disk_part_iter_next); |
| 174 | |
| 175 | /** |
| 176 | * disk_part_iter_exit - finish up partition iteration |
| 177 | * @piter: iter of interest |
| 178 | * |
| 179 | * Called when iteration is over. Cleans up @piter. |
| 180 | * |
| 181 | * CONTEXT: |
| 182 | * Don't care. |
| 183 | */ |
| 184 | void disk_part_iter_exit(struct disk_part_iter *piter) |
| 185 | { |
| 186 | disk_put_part(piter->part); |
| 187 | piter->part = NULL; |
| 188 | } |
| 189 | EXPORT_SYMBOL_GPL(disk_part_iter_exit); |
| 190 | |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 191 | static inline int sector_in_part(struct hd_struct *part, sector_t sector) |
| 192 | { |
| 193 | return part->start_sect <= sector && |
| 194 | sector < part->start_sect + part->nr_sects; |
| 195 | } |
| 196 | |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 197 | /** |
| 198 | * disk_map_sector_rcu - map sector to partition |
| 199 | * @disk: gendisk of interest |
| 200 | * @sector: sector to map |
| 201 | * |
| 202 | * Find out which partition @sector maps to on @disk. This is |
| 203 | * primarily used for stats accounting. |
| 204 | * |
| 205 | * CONTEXT: |
| 206 | * RCU read locked. The returned partition pointer is valid only |
| 207 | * while preemption is disabled. |
| 208 | * |
| 209 | * RETURNS: |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 210 | * Found partition on success, part0 is returned if no partition matches |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 211 | */ |
| 212 | struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, sector_t sector) |
| 213 | { |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 214 | struct disk_part_tbl *ptbl; |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 215 | struct hd_struct *part; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 216 | int i; |
| 217 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 218 | ptbl = rcu_dereference(disk->part_tbl); |
| 219 | |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 220 | part = rcu_dereference(ptbl->last_lookup); |
| 221 | if (part && sector_in_part(part, sector)) |
| 222 | return part; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 223 | |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 224 | for (i = 1; i < ptbl->len; i++) { |
| 225 | part = rcu_dereference(ptbl->part[i]); |
| 226 | |
| 227 | if (part && sector_in_part(part, sector)) { |
| 228 | rcu_assign_pointer(ptbl->last_lookup, part); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 229 | return part; |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 230 | } |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 231 | } |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 232 | return &disk->part0; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 233 | } |
| 234 | EXPORT_SYMBOL_GPL(disk_map_sector_rcu); |
| 235 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | /* |
| 237 | * Can be deleted altogether. Later. |
| 238 | * |
| 239 | */ |
| 240 | static struct blk_major_name { |
| 241 | struct blk_major_name *next; |
| 242 | int major; |
| 243 | char name[16]; |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 244 | } *major_names[BLKDEV_MAJOR_HASH_SIZE]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | |
| 246 | /* index in the above - for now: assume no multimajor ranges */ |
Yang Zhang | e61eb2e | 2010-12-17 09:00:18 +0100 | [diff] [blame] | 247 | static inline int major_to_index(unsigned major) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 249 | return major % BLKDEV_MAJOR_HASH_SIZE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 252 | #ifdef CONFIG_PROC_FS |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 253 | void blkdev_show(struct seq_file *seqf, off_t offset) |
Neil Horman | 7170be5 | 2006-01-14 13:20:38 -0800 | [diff] [blame] | 254 | { |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 255 | struct blk_major_name *dp; |
Neil Horman | 7170be5 | 2006-01-14 13:20:38 -0800 | [diff] [blame] | 256 | |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 257 | if (offset < BLKDEV_MAJOR_HASH_SIZE) { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 258 | mutex_lock(&block_class_lock); |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 259 | for (dp = major_names[offset]; dp; dp = dp->next) |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 260 | seq_printf(seqf, "%3d %s\n", dp->major, dp->name); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 261 | mutex_unlock(&block_class_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | } |
Joe Korty | 68eef3b | 2006-03-31 02:30:32 -0800 | [diff] [blame] | 264 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | |
Márton Németh | 9e8c0bc | 2009-02-20 08:12:51 +0100 | [diff] [blame] | 266 | /** |
| 267 | * register_blkdev - register a new block device |
| 268 | * |
| 269 | * @major: the requested major device number [1..255]. If @major=0, try to |
| 270 | * allocate any unused major number. |
| 271 | * @name: the name of the new block device as a zero terminated string |
| 272 | * |
| 273 | * The @name must be unique within the system. |
| 274 | * |
| 275 | * The return value depends on the @major input parameter. |
| 276 | * - if a major device number was requested in range [1..255] then the |
| 277 | * function returns zero on success, or a negative error code |
| 278 | * - if any unused major number was requested with @major=0 parameter |
| 279 | * then the return value is the allocated major number in range |
| 280 | * [1..255] or a negative error code otherwise |
| 281 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | int register_blkdev(unsigned int major, const char *name) |
| 283 | { |
| 284 | struct blk_major_name **n, *p; |
| 285 | int index, ret = 0; |
| 286 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 287 | mutex_lock(&block_class_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | |
| 289 | /* temporary */ |
| 290 | if (major == 0) { |
| 291 | for (index = ARRAY_SIZE(major_names)-1; index > 0; index--) { |
| 292 | if (major_names[index] == NULL) |
| 293 | break; |
| 294 | } |
| 295 | |
| 296 | if (index == 0) { |
| 297 | printk("register_blkdev: failed to get major for %s\n", |
| 298 | name); |
| 299 | ret = -EBUSY; |
| 300 | goto out; |
| 301 | } |
| 302 | major = index; |
| 303 | ret = major; |
| 304 | } |
| 305 | |
| 306 | p = kmalloc(sizeof(struct blk_major_name), GFP_KERNEL); |
| 307 | if (p == NULL) { |
| 308 | ret = -ENOMEM; |
| 309 | goto out; |
| 310 | } |
| 311 | |
| 312 | p->major = major; |
| 313 | strlcpy(p->name, name, sizeof(p->name)); |
| 314 | p->next = NULL; |
| 315 | index = major_to_index(major); |
| 316 | |
| 317 | for (n = &major_names[index]; *n; n = &(*n)->next) { |
| 318 | if ((*n)->major == major) |
| 319 | break; |
| 320 | } |
| 321 | if (!*n) |
| 322 | *n = p; |
| 323 | else |
| 324 | ret = -EBUSY; |
| 325 | |
| 326 | if (ret < 0) { |
| 327 | printk("register_blkdev: cannot get major %d for %s\n", |
| 328 | major, name); |
| 329 | kfree(p); |
| 330 | } |
| 331 | out: |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 332 | mutex_unlock(&block_class_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | return ret; |
| 334 | } |
| 335 | |
| 336 | EXPORT_SYMBOL(register_blkdev); |
| 337 | |
Akinobu Mita | f448024 | 2007-07-17 04:03:47 -0700 | [diff] [blame] | 338 | void unregister_blkdev(unsigned int major, const char *name) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | { |
| 340 | struct blk_major_name **n; |
| 341 | struct blk_major_name *p = NULL; |
| 342 | int index = major_to_index(major); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 344 | mutex_lock(&block_class_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | for (n = &major_names[index]; *n; n = &(*n)->next) |
| 346 | if ((*n)->major == major) |
| 347 | break; |
Akinobu Mita | 294462a | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 348 | if (!*n || strcmp((*n)->name, name)) { |
| 349 | WARN_ON(1); |
Akinobu Mita | 294462a | 2007-07-17 04:03:45 -0700 | [diff] [blame] | 350 | } else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | p = *n; |
| 352 | *n = p->next; |
| 353 | } |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 354 | mutex_unlock(&block_class_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | kfree(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | } |
| 357 | |
| 358 | EXPORT_SYMBOL(unregister_blkdev); |
| 359 | |
| 360 | static struct kobj_map *bdev_map; |
| 361 | |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 362 | /** |
Tejun Heo | 870d665 | 2008-08-25 19:47:25 +0900 | [diff] [blame] | 363 | * blk_mangle_minor - scatter minor numbers apart |
| 364 | * @minor: minor number to mangle |
| 365 | * |
| 366 | * Scatter consecutively allocated @minor number apart if MANGLE_DEVT |
| 367 | * is enabled. Mangling twice gives the original value. |
| 368 | * |
| 369 | * RETURNS: |
| 370 | * Mangled value. |
| 371 | * |
| 372 | * CONTEXT: |
| 373 | * Don't care. |
| 374 | */ |
| 375 | static int blk_mangle_minor(int minor) |
| 376 | { |
| 377 | #ifdef CONFIG_DEBUG_BLOCK_EXT_DEVT |
| 378 | int i; |
| 379 | |
| 380 | for (i = 0; i < MINORBITS / 2; i++) { |
| 381 | int low = minor & (1 << i); |
| 382 | int high = minor & (1 << (MINORBITS - 1 - i)); |
| 383 | int distance = MINORBITS - 1 - 2 * i; |
| 384 | |
| 385 | minor ^= low | high; /* clear both bits */ |
| 386 | low <<= distance; /* swap the positions */ |
| 387 | high >>= distance; |
| 388 | minor |= low | high; /* and set */ |
| 389 | } |
| 390 | #endif |
| 391 | return minor; |
| 392 | } |
| 393 | |
| 394 | /** |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 395 | * blk_alloc_devt - allocate a dev_t for a partition |
| 396 | * @part: partition to allocate dev_t for |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 397 | * @devt: out parameter for resulting dev_t |
| 398 | * |
| 399 | * Allocate a dev_t for block device. |
| 400 | * |
| 401 | * RETURNS: |
| 402 | * 0 on success, allocated dev_t is returned in *@devt. -errno on |
| 403 | * failure. |
| 404 | * |
| 405 | * CONTEXT: |
| 406 | * Might sleep. |
| 407 | */ |
| 408 | int blk_alloc_devt(struct hd_struct *part, dev_t *devt) |
| 409 | { |
| 410 | struct gendisk *disk = part_to_disk(part); |
| 411 | int idx, rc; |
| 412 | |
| 413 | /* in consecutive minor range? */ |
| 414 | if (part->partno < disk->minors) { |
| 415 | *devt = MKDEV(disk->major, disk->first_minor + part->partno); |
| 416 | return 0; |
| 417 | } |
| 418 | |
| 419 | /* allocate ext devt */ |
| 420 | do { |
| 421 | if (!idr_pre_get(&ext_devt_idr, GFP_KERNEL)) |
| 422 | return -ENOMEM; |
| 423 | rc = idr_get_new(&ext_devt_idr, part, &idx); |
| 424 | } while (rc == -EAGAIN); |
| 425 | |
| 426 | if (rc) |
| 427 | return rc; |
| 428 | |
| 429 | if (idx > MAX_EXT_DEVT) { |
| 430 | idr_remove(&ext_devt_idr, idx); |
| 431 | return -EBUSY; |
| 432 | } |
| 433 | |
Tejun Heo | 870d665 | 2008-08-25 19:47:25 +0900 | [diff] [blame] | 434 | *devt = MKDEV(BLOCK_EXT_MAJOR, blk_mangle_minor(idx)); |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 435 | return 0; |
| 436 | } |
| 437 | |
| 438 | /** |
| 439 | * blk_free_devt - free a dev_t |
| 440 | * @devt: dev_t to free |
| 441 | * |
| 442 | * Free @devt which was allocated using blk_alloc_devt(). |
| 443 | * |
| 444 | * CONTEXT: |
| 445 | * Might sleep. |
| 446 | */ |
| 447 | void blk_free_devt(dev_t devt) |
| 448 | { |
| 449 | might_sleep(); |
| 450 | |
| 451 | if (devt == MKDEV(0, 0)) |
| 452 | return; |
| 453 | |
| 454 | if (MAJOR(devt) == BLOCK_EXT_MAJOR) { |
| 455 | mutex_lock(&ext_devt_mutex); |
Tejun Heo | 870d665 | 2008-08-25 19:47:25 +0900 | [diff] [blame] | 456 | idr_remove(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 457 | mutex_unlock(&ext_devt_mutex); |
| 458 | } |
| 459 | } |
| 460 | |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 461 | static char *bdevt_str(dev_t devt, char *buf) |
| 462 | { |
| 463 | if (MAJOR(devt) <= 0xff && MINOR(devt) <= 0xff) { |
| 464 | char tbuf[BDEVT_SIZE]; |
| 465 | snprintf(tbuf, BDEVT_SIZE, "%02x%02x", MAJOR(devt), MINOR(devt)); |
| 466 | snprintf(buf, BDEVT_SIZE, "%-9s", tbuf); |
| 467 | } else |
| 468 | snprintf(buf, BDEVT_SIZE, "%03x:%05x", MAJOR(devt), MINOR(devt)); |
| 469 | |
| 470 | return buf; |
| 471 | } |
| 472 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | /* |
| 474 | * Register device numbers dev..(dev+range-1) |
| 475 | * range must be nonzero |
| 476 | * The hash chain is sorted on range, so that subranges can override. |
| 477 | */ |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 478 | void blk_register_region(dev_t devt, unsigned long range, struct module *module, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | struct kobject *(*probe)(dev_t, int *, void *), |
| 480 | int (*lock)(dev_t, void *), void *data) |
| 481 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 482 | kobj_map(bdev_map, devt, range, module, probe, lock, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | } |
| 484 | |
| 485 | EXPORT_SYMBOL(blk_register_region); |
| 486 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 487 | void blk_unregister_region(dev_t devt, unsigned long range) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 489 | kobj_unmap(bdev_map, devt, range); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | } |
| 491 | |
| 492 | EXPORT_SYMBOL(blk_unregister_region); |
| 493 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 494 | static struct kobject *exact_match(dev_t devt, int *partno, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | { |
| 496 | struct gendisk *p = data; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 497 | |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 498 | return &disk_to_dev(p)->kobj; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | } |
| 500 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 501 | static int exact_lock(dev_t devt, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | { |
| 503 | struct gendisk *p = data; |
| 504 | |
| 505 | if (!get_disk(p)) |
| 506 | return -1; |
| 507 | return 0; |
| 508 | } |
| 509 | |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 510 | void register_disk(struct gendisk *disk) |
| 511 | { |
| 512 | struct device *ddev = disk_to_dev(disk); |
| 513 | struct block_device *bdev; |
| 514 | struct disk_part_iter piter; |
| 515 | struct hd_struct *part; |
| 516 | int err; |
| 517 | |
| 518 | ddev->parent = disk->driverfs_dev; |
| 519 | |
| 520 | dev_set_name(ddev, disk->disk_name); |
| 521 | |
| 522 | /* delay uevents, until we scanned partition table */ |
| 523 | dev_set_uevent_suppress(ddev, 1); |
| 524 | |
| 525 | if (device_add(ddev)) |
| 526 | return; |
| 527 | if (!sysfs_deprecated) { |
| 528 | err = sysfs_create_link(block_depr, &ddev->kobj, |
| 529 | kobject_name(&ddev->kobj)); |
| 530 | if (err) { |
| 531 | device_del(ddev); |
| 532 | return; |
| 533 | } |
| 534 | } |
| 535 | disk->part0.holder_dir = kobject_create_and_add("holders", &ddev->kobj); |
| 536 | disk->slave_dir = kobject_create_and_add("slaves", &ddev->kobj); |
| 537 | |
| 538 | /* No minors to use for partitions */ |
| 539 | if (!disk_partitionable(disk)) |
| 540 | goto exit; |
| 541 | |
| 542 | /* No such device (e.g., media were just removed) */ |
| 543 | if (!get_capacity(disk)) |
| 544 | goto exit; |
| 545 | |
| 546 | bdev = bdget_disk(disk, 0); |
| 547 | if (!bdev) |
| 548 | goto exit; |
| 549 | |
| 550 | bdev->bd_invalidated = 1; |
| 551 | err = blkdev_get(bdev, FMODE_READ, NULL); |
| 552 | if (err < 0) |
| 553 | goto exit; |
| 554 | blkdev_put(bdev, FMODE_READ); |
| 555 | |
| 556 | exit: |
| 557 | /* announce disk after possible partitions are created */ |
| 558 | dev_set_uevent_suppress(ddev, 0); |
| 559 | kobject_uevent(&ddev->kobj, KOBJ_ADD); |
| 560 | |
| 561 | /* announce possible partitions */ |
| 562 | disk_part_iter_init(&piter, disk, 0); |
| 563 | while ((part = disk_part_iter_next(&piter))) |
| 564 | kobject_uevent(&part_to_dev(part)->kobj, KOBJ_ADD); |
| 565 | disk_part_iter_exit(&piter); |
| 566 | } |
| 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | /** |
| 569 | * add_disk - add partitioning information to kernel list |
| 570 | * @disk: per-device partitioning information |
| 571 | * |
| 572 | * This function registers the partitioning information in @disk |
| 573 | * with the kernel. |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 574 | * |
| 575 | * FIXME: error handling |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | */ |
| 577 | void add_disk(struct gendisk *disk) |
| 578 | { |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 579 | struct backing_dev_info *bdi; |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 580 | dev_t devt; |
Greg Kroah-Hartman | 6ffeea7 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 581 | int retval; |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 582 | |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 583 | /* minors == 0 indicates to use ext devt from part0 and should |
| 584 | * be accompanied with EXT_DEVT flag. Make sure all |
| 585 | * parameters make sense. |
| 586 | */ |
| 587 | WARN_ON(disk->minors && !(disk->major || disk->first_minor)); |
| 588 | WARN_ON(!disk->minors && !(disk->flags & GENHD_FL_EXT_DEVT)); |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | disk->flags |= GENHD_FL_UP; |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 591 | |
| 592 | retval = blk_alloc_devt(&disk->part0, &devt); |
| 593 | if (retval) { |
| 594 | WARN_ON(1); |
| 595 | return; |
| 596 | } |
| 597 | disk_to_dev(disk)->devt = devt; |
| 598 | |
| 599 | /* ->major and ->first_minor aren't supposed to be |
| 600 | * dereferenced from here on, but set them just in case. |
| 601 | */ |
| 602 | disk->major = MAJOR(devt); |
| 603 | disk->first_minor = MINOR(devt); |
| 604 | |
Signed-off-by: Jan Kara | 01ea506 | 2010-09-16 20:36:36 +0200 | [diff] [blame] | 605 | /* Register BDI before referencing it from bdev */ |
| 606 | bdi = &disk->queue->backing_dev_info; |
| 607 | bdi_register_dev(bdi, disk_devt(disk)); |
| 608 | |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 609 | blk_register_region(disk_devt(disk), disk->minors, NULL, |
| 610 | exact_match, exact_lock, disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | register_disk(disk); |
| 612 | blk_register_queue(disk); |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 613 | |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 614 | retval = sysfs_create_link(&disk_to_dev(disk)->kobj, &bdi->dev->kobj, |
| 615 | "bdi"); |
Greg Kroah-Hartman | 6ffeea7 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 616 | WARN_ON(retval); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 617 | |
| 618 | disk_add_events(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | EXPORT_SYMBOL(add_disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 622 | void del_gendisk(struct gendisk *disk) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | { |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 624 | struct disk_part_iter piter; |
| 625 | struct hd_struct *part; |
| 626 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 627 | disk_del_events(disk); |
| 628 | |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 629 | /* invalidate stuff */ |
| 630 | disk_part_iter_init(&piter, disk, |
| 631 | DISK_PITER_INCL_EMPTY | DISK_PITER_REVERSE); |
| 632 | while ((part = disk_part_iter_next(&piter))) { |
| 633 | invalidate_partition(disk, part->partno); |
| 634 | delete_partition(disk, part->partno); |
| 635 | } |
| 636 | disk_part_iter_exit(&piter); |
| 637 | |
| 638 | invalidate_partition(disk, 0); |
| 639 | blk_free_devt(disk_to_dev(disk)->devt); |
| 640 | set_capacity(disk, 0); |
| 641 | disk->flags &= ~GENHD_FL_UP; |
| 642 | |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 643 | sysfs_remove_link(&disk_to_dev(disk)->kobj, "bdi"); |
Peter Zijlstra | cf0ca9f | 2008-04-30 00:54:32 -0700 | [diff] [blame] | 644 | bdi_unregister(&disk->queue->backing_dev_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | blk_unregister_queue(disk); |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 646 | blk_unregister_region(disk_devt(disk), disk->minors); |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 647 | |
| 648 | part_stat_set_all(&disk->part0, 0); |
| 649 | disk->part0.stamp = 0; |
| 650 | |
| 651 | kobject_put(disk->part0.holder_dir); |
| 652 | kobject_put(disk->slave_dir); |
| 653 | disk->driverfs_dev = NULL; |
| 654 | if (!sysfs_deprecated) |
| 655 | sysfs_remove_link(block_depr, dev_name(disk_to_dev(disk))); |
| 656 | device_del(disk_to_dev(disk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | } |
Tejun Heo | d2bf1b6 | 2010-12-08 20:57:36 +0100 | [diff] [blame] | 658 | EXPORT_SYMBOL(del_gendisk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | /** |
| 661 | * get_gendisk - get partitioning information for a given device |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 662 | * @devt: device to get partitioning information for |
Randy Dunlap | 496aa8a | 2008-10-16 07:46:23 +0200 | [diff] [blame] | 663 | * @partno: returned partition index |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | * |
| 665 | * This function gets the structure containing partitioning |
Randy Dunlap | 710027a | 2008-08-19 20:13:11 +0200 | [diff] [blame] | 666 | * information for the given device @devt. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | */ |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 668 | struct gendisk *get_gendisk(dev_t devt, int *partno) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 670 | struct gendisk *disk = NULL; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 671 | |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 672 | if (MAJOR(devt) != BLOCK_EXT_MAJOR) { |
| 673 | struct kobject *kobj; |
| 674 | |
| 675 | kobj = kobj_lookup(bdev_map, devt, partno); |
| 676 | if (kobj) |
| 677 | disk = dev_to_disk(kobj_to_dev(kobj)); |
| 678 | } else { |
| 679 | struct hd_struct *part; |
| 680 | |
| 681 | mutex_lock(&ext_devt_mutex); |
Tejun Heo | 870d665 | 2008-08-25 19:47:25 +0900 | [diff] [blame] | 682 | part = idr_find(&ext_devt_idr, blk_mangle_minor(MINOR(devt))); |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 683 | if (part && get_disk(part_to_disk(part))) { |
| 684 | *partno = part->partno; |
| 685 | disk = part_to_disk(part); |
| 686 | } |
| 687 | mutex_unlock(&ext_devt_mutex); |
| 688 | } |
| 689 | |
| 690 | return disk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | } |
Divyesh Shah | b6ac23af | 2010-04-15 08:54:59 +0200 | [diff] [blame] | 692 | EXPORT_SYMBOL(get_gendisk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 694 | /** |
| 695 | * bdget_disk - do bdget() by gendisk and partition number |
| 696 | * @disk: gendisk of interest |
| 697 | * @partno: partition number |
| 698 | * |
| 699 | * Find partition @partno from @disk, do bdget() on it. |
| 700 | * |
| 701 | * CONTEXT: |
| 702 | * Don't care. |
| 703 | * |
| 704 | * RETURNS: |
| 705 | * Resulting block_device on success, NULL on failure. |
| 706 | */ |
Harvey Harrison | aeb3d3a | 2008-08-28 09:27:42 +0200 | [diff] [blame] | 707 | struct block_device *bdget_disk(struct gendisk *disk, int partno) |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 708 | { |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 709 | struct hd_struct *part; |
| 710 | struct block_device *bdev = NULL; |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 711 | |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 712 | part = disk_get_part(disk, partno); |
Tejun Heo | 2bbedcb | 2008-08-29 11:41:51 +0200 | [diff] [blame] | 713 | if (part) |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 714 | bdev = bdget(part_devt(part)); |
| 715 | disk_put_part(part); |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 716 | |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 717 | return bdev; |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 718 | } |
| 719 | EXPORT_SYMBOL(bdget_disk); |
| 720 | |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 721 | /* |
| 722 | * print a full list of all partitions - intended for places where the root |
| 723 | * filesystem can't be mounted and thus to give the victim some idea of what |
| 724 | * went wrong |
| 725 | */ |
| 726 | void __init printk_all_partitions(void) |
| 727 | { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 728 | struct class_dev_iter iter; |
| 729 | struct device *dev; |
| 730 | |
| 731 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
| 732 | while ((dev = class_dev_iter_next(&iter))) { |
| 733 | struct gendisk *disk = dev_to_disk(dev); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 734 | struct disk_part_iter piter; |
| 735 | struct hd_struct *part; |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 736 | char name_buf[BDEVNAME_SIZE]; |
| 737 | char devt_buf[BDEVT_SIZE]; |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 738 | u8 uuid[PARTITION_META_INFO_UUIDLTH * 2 + 1]; |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 739 | |
| 740 | /* |
| 741 | * Don't show empty devices or things that have been |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 742 | * suppressed |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 743 | */ |
| 744 | if (get_capacity(disk) == 0 || |
| 745 | (disk->flags & GENHD_FL_SUPPRESS_PARTITION_INFO)) |
| 746 | continue; |
| 747 | |
| 748 | /* |
| 749 | * Note, unlike /proc/partitions, I am showing the |
| 750 | * numbers in hex - the same format as the root= |
| 751 | * option takes. |
| 752 | */ |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 753 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0); |
| 754 | while ((part = disk_part_iter_next(&piter))) { |
| 755 | bool is_part0 = part == &disk->part0; |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 756 | |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 757 | uuid[0] = 0; |
| 758 | if (part->info) |
| 759 | part_unpack_uuid(part->info->uuid, uuid); |
| 760 | |
| 761 | printk("%s%s %10llu %s %s", is_part0 ? "" : " ", |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 762 | bdevt_str(part_devt(part), devt_buf), |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 763 | (unsigned long long)part->nr_sects >> 1, |
Will Drewry | b5af921 | 2010-08-31 15:47:07 -0500 | [diff] [blame] | 764 | disk_name(disk, part->partno, name_buf), uuid); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 765 | if (is_part0) { |
| 766 | if (disk->driverfs_dev != NULL && |
| 767 | disk->driverfs_dev->driver != NULL) |
| 768 | printk(" driver: %s\n", |
| 769 | disk->driverfs_dev->driver->name); |
| 770 | else |
| 771 | printk(" (driver?)\n"); |
| 772 | } else |
| 773 | printk("\n"); |
| 774 | } |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 775 | disk_part_iter_exit(&piter); |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 776 | } |
| 777 | class_dev_iter_exit(&iter); |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 778 | } |
| 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | #ifdef CONFIG_PROC_FS |
| 781 | /* iterator */ |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 782 | static void *disk_seqf_start(struct seq_file *seqf, loff_t *pos) |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 783 | { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 784 | loff_t skip = *pos; |
| 785 | struct class_dev_iter *iter; |
| 786 | struct device *dev; |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 787 | |
Harvey Harrison | aeb3d3a | 2008-08-28 09:27:42 +0200 | [diff] [blame] | 788 | iter = kmalloc(sizeof(*iter), GFP_KERNEL); |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 789 | if (!iter) |
| 790 | return ERR_PTR(-ENOMEM); |
| 791 | |
| 792 | seqf->private = iter; |
| 793 | class_dev_iter_init(iter, &block_class, NULL, &disk_type); |
| 794 | do { |
| 795 | dev = class_dev_iter_next(iter); |
| 796 | if (!dev) |
| 797 | return NULL; |
| 798 | } while (skip--); |
| 799 | |
| 800 | return dev_to_disk(dev); |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 801 | } |
| 802 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 803 | static void *disk_seqf_next(struct seq_file *seqf, void *v, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 805 | struct device *dev; |
Greg Kroah-Hartman | 66c64af | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 806 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 807 | (*pos)++; |
| 808 | dev = class_dev_iter_next(seqf->private); |
Tejun Heo | 2ac3cee | 2008-09-03 08:53:37 +0200 | [diff] [blame] | 809 | if (dev) |
Greg Kroah-Hartman | 68c4d4a | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 810 | return dev_to_disk(dev); |
Tejun Heo | 2ac3cee | 2008-09-03 08:53:37 +0200 | [diff] [blame] | 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | return NULL; |
| 813 | } |
| 814 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 815 | static void disk_seqf_stop(struct seq_file *seqf, void *v) |
Greg Kroah-Hartman | 27f3025 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 816 | { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 817 | struct class_dev_iter *iter = seqf->private; |
Greg Kroah-Hartman | 27f3025 | 2008-05-22 17:21:08 -0400 | [diff] [blame] | 818 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 819 | /* stop is called even after start failed :-( */ |
| 820 | if (iter) { |
| 821 | class_dev_iter_exit(iter); |
| 822 | kfree(iter); |
Kay Sievers | 5c0ef6d | 2008-08-16 14:30:30 +0200 | [diff] [blame] | 823 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 824 | } |
| 825 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 826 | static void *show_partition_start(struct seq_file *seqf, loff_t *pos) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 828 | static void *p; |
| 829 | |
| 830 | p = disk_seqf_start(seqf, pos); |
Yang Zhang | b9f985b | 2010-12-17 08:58:36 +0100 | [diff] [blame] | 831 | if (!IS_ERR_OR_NULL(p) && !*pos) |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 832 | seq_puts(seqf, "major minor #blocks name\n\n"); |
| 833 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 834 | } |
| 835 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 836 | static int show_partition(struct seq_file *seqf, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | { |
| 838 | struct gendisk *sgp = v; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 839 | struct disk_part_iter piter; |
| 840 | struct hd_struct *part; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | char buf[BDEVNAME_SIZE]; |
| 842 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 843 | /* Don't show non-partitionable removeable devices or empty devices */ |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 844 | if (!get_capacity(sgp) || (!disk_partitionable(sgp) && |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 845 | (sgp->flags & GENHD_FL_REMOVABLE))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 846 | return 0; |
| 847 | if (sgp->flags & GENHD_FL_SUPPRESS_PARTITION_INFO) |
| 848 | return 0; |
| 849 | |
| 850 | /* show the full disk and all non-0 size partitions of it */ |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 851 | disk_part_iter_init(&piter, sgp, DISK_PITER_INCL_PART0); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 852 | while ((part = disk_part_iter_next(&piter))) |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 853 | seq_printf(seqf, "%4d %7d %10llu %s\n", |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 854 | MAJOR(part_devt(part)), MINOR(part_devt(part)), |
| 855 | (unsigned long long)part->nr_sects >> 1, |
| 856 | disk_name(sgp, part->partno, buf)); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 857 | disk_part_iter_exit(&piter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | |
| 859 | return 0; |
| 860 | } |
| 861 | |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 862 | static const struct seq_operations partitions_op = { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 863 | .start = show_partition_start, |
| 864 | .next = disk_seqf_next, |
| 865 | .stop = disk_seqf_stop, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 866 | .show = show_partition |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | }; |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 868 | |
| 869 | static int partitions_open(struct inode *inode, struct file *file) |
| 870 | { |
| 871 | return seq_open(file, &partitions_op); |
| 872 | } |
| 873 | |
| 874 | static const struct file_operations proc_partitions_operations = { |
| 875 | .open = partitions_open, |
| 876 | .read = seq_read, |
| 877 | .llseek = seq_lseek, |
| 878 | .release = seq_release, |
| 879 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | #endif |
| 881 | |
| 882 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 883 | static struct kobject *base_probe(dev_t devt, int *partno, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 884 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 885 | if (request_module("block-major-%d-%d", MAJOR(devt), MINOR(devt)) > 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | /* Make old-style 2.4 aliases work */ |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 887 | request_module("block-major-%d", MAJOR(devt)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | return NULL; |
| 889 | } |
| 890 | |
| 891 | static int __init genhd_device_init(void) |
| 892 | { |
Dan Williams | e105b8b | 2008-04-21 10:51:07 -0700 | [diff] [blame] | 893 | int error; |
| 894 | |
| 895 | block_class.dev_kobj = sysfs_dev_block_kobj; |
| 896 | error = class_register(&block_class); |
Roland McGrath | ee27a55 | 2008-03-11 17:13:15 -0700 | [diff] [blame] | 897 | if (unlikely(error)) |
| 898 | return error; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 899 | bdev_map = kobj_map_init(base_probe, &block_class_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | blk_dev_init(); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 901 | |
Zhang, Yanmin | 561ec68 | 2008-11-14 08:26:30 +0100 | [diff] [blame] | 902 | register_blkdev(BLOCK_EXT_MAJOR, "blkext"); |
| 903 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 904 | /* create top-level block dir */ |
Andi Kleen | e52eec1 | 2010-09-08 16:54:17 +0200 | [diff] [blame] | 905 | if (!sysfs_deprecated) |
| 906 | block_depr = kobject_create_and_add("block", NULL); |
Greg Kroah-Hartman | 830d3cf | 2007-11-06 10:36:58 -0800 | [diff] [blame] | 907 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | } |
| 909 | |
| 910 | subsys_initcall(genhd_device_init); |
| 911 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 912 | static ssize_t disk_range_show(struct device *dev, |
| 913 | struct device_attribute *attr, char *buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 915 | struct gendisk *disk = dev_to_disk(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 916 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 917 | return sprintf(buf, "%d\n", disk->minors); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | } |
| 919 | |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 920 | static ssize_t disk_ext_range_show(struct device *dev, |
| 921 | struct device_attribute *attr, char *buf) |
| 922 | { |
| 923 | struct gendisk *disk = dev_to_disk(dev); |
| 924 | |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 925 | return sprintf(buf, "%d\n", disk_max_parts(disk)); |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 926 | } |
| 927 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 928 | static ssize_t disk_removable_show(struct device *dev, |
| 929 | struct device_attribute *attr, char *buf) |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 930 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 931 | struct gendisk *disk = dev_to_disk(dev); |
Kay Sievers | a7fd670 | 2005-10-01 14:49:43 +0200 | [diff] [blame] | 932 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 933 | return sprintf(buf, "%d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | (disk->flags & GENHD_FL_REMOVABLE ? 1 : 0)); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 935 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 937 | static ssize_t disk_ro_show(struct device *dev, |
| 938 | struct device_attribute *attr, char *buf) |
| 939 | { |
| 940 | struct gendisk *disk = dev_to_disk(dev); |
| 941 | |
Tejun Heo | b7db995 | 2008-08-25 19:56:10 +0900 | [diff] [blame] | 942 | return sprintf(buf, "%d\n", get_disk_ro(disk) ? 1 : 0); |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 943 | } |
| 944 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 945 | static ssize_t disk_capability_show(struct device *dev, |
| 946 | struct device_attribute *attr, char *buf) |
Kristen Carlson Accardi | 86ce18d | 2007-05-23 13:57:38 -0700 | [diff] [blame] | 947 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 948 | struct gendisk *disk = dev_to_disk(dev); |
| 949 | |
| 950 | return sprintf(buf, "%x\n", disk->flags); |
Kristen Carlson Accardi | 86ce18d | 2007-05-23 13:57:38 -0700 | [diff] [blame] | 951 | } |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 952 | |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 953 | static ssize_t disk_alignment_offset_show(struct device *dev, |
| 954 | struct device_attribute *attr, |
| 955 | char *buf) |
| 956 | { |
| 957 | struct gendisk *disk = dev_to_disk(dev); |
| 958 | |
| 959 | return sprintf(buf, "%d\n", queue_alignment_offset(disk->queue)); |
| 960 | } |
| 961 | |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 962 | static ssize_t disk_discard_alignment_show(struct device *dev, |
| 963 | struct device_attribute *attr, |
| 964 | char *buf) |
| 965 | { |
| 966 | struct gendisk *disk = dev_to_disk(dev); |
| 967 | |
Martin K. Petersen | dd3d145 | 2010-01-11 03:21:48 -0500 | [diff] [blame] | 968 | return sprintf(buf, "%d\n", queue_discard_alignment(disk->queue)); |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 969 | } |
| 970 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 971 | static DEVICE_ATTR(range, S_IRUGO, disk_range_show, NULL); |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 972 | static DEVICE_ATTR(ext_range, S_IRUGO, disk_ext_range_show, NULL); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 973 | static DEVICE_ATTR(removable, S_IRUGO, disk_removable_show, NULL); |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 974 | static DEVICE_ATTR(ro, S_IRUGO, disk_ro_show, NULL); |
Tejun Heo | e561052 | 2008-08-25 19:56:09 +0900 | [diff] [blame] | 975 | static DEVICE_ATTR(size, S_IRUGO, part_size_show, NULL); |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 976 | static DEVICE_ATTR(alignment_offset, S_IRUGO, disk_alignment_offset_show, NULL); |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 977 | static DEVICE_ATTR(discard_alignment, S_IRUGO, disk_discard_alignment_show, |
| 978 | NULL); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 979 | static DEVICE_ATTR(capability, S_IRUGO, disk_capability_show, NULL); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 980 | static DEVICE_ATTR(stat, S_IRUGO, part_stat_show, NULL); |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 981 | static DEVICE_ATTR(inflight, S_IRUGO, part_inflight_show, NULL); |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 982 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 983 | static struct device_attribute dev_attr_fail = |
Tejun Heo | eddb2e2 | 2008-08-25 19:56:13 +0900 | [diff] [blame] | 984 | __ATTR(make-it-fail, S_IRUGO|S_IWUSR, part_fail_show, part_fail_store); |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 985 | #endif |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 986 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
| 987 | static struct device_attribute dev_attr_fail_timeout = |
| 988 | __ATTR(io-timeout-fail, S_IRUGO|S_IWUSR, part_timeout_show, |
| 989 | part_timeout_store); |
| 990 | #endif |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 991 | |
| 992 | static struct attribute *disk_attrs[] = { |
| 993 | &dev_attr_range.attr, |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 994 | &dev_attr_ext_range.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 995 | &dev_attr_removable.attr, |
Kay Sievers | 1c9ce52 | 2008-06-13 09:41:00 +0200 | [diff] [blame] | 996 | &dev_attr_ro.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 997 | &dev_attr_size.attr, |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 998 | &dev_attr_alignment_offset.attr, |
Martin K. Petersen | 86b3728 | 2009-11-10 11:50:21 +0100 | [diff] [blame] | 999 | &dev_attr_discard_alignment.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1000 | &dev_attr_capability.attr, |
| 1001 | &dev_attr_stat.attr, |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 1002 | &dev_attr_inflight.attr, |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1003 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 1004 | &dev_attr_fail.attr, |
| 1005 | #endif |
Jens Axboe | 581d4e2 | 2008-09-14 05:56:33 -0700 | [diff] [blame] | 1006 | #ifdef CONFIG_FAIL_IO_TIMEOUT |
| 1007 | &dev_attr_fail_timeout.attr, |
| 1008 | #endif |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1009 | NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | }; |
| 1011 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1012 | static struct attribute_group disk_attr_group = { |
| 1013 | .attrs = disk_attrs, |
| 1014 | }; |
| 1015 | |
David Brownell | a4dbd67 | 2009-06-24 10:06:31 -0700 | [diff] [blame] | 1016 | static const struct attribute_group *disk_attr_groups[] = { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1017 | &disk_attr_group, |
| 1018 | NULL |
| 1019 | }; |
| 1020 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1021 | /** |
| 1022 | * disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way |
| 1023 | * @disk: disk to replace part_tbl for |
| 1024 | * @new_ptbl: new part_tbl to install |
| 1025 | * |
| 1026 | * Replace disk->part_tbl with @new_ptbl in RCU-safe way. The |
| 1027 | * original ptbl is freed using RCU callback. |
| 1028 | * |
| 1029 | * LOCKING: |
| 1030 | * Matching bd_mutx locked. |
| 1031 | */ |
| 1032 | static void disk_replace_part_tbl(struct gendisk *disk, |
| 1033 | struct disk_part_tbl *new_ptbl) |
| 1034 | { |
| 1035 | struct disk_part_tbl *old_ptbl = disk->part_tbl; |
| 1036 | |
| 1037 | rcu_assign_pointer(disk->part_tbl, new_ptbl); |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 1038 | |
| 1039 | if (old_ptbl) { |
| 1040 | rcu_assign_pointer(old_ptbl->last_lookup, NULL); |
Lai Jiangshan | 57bdfbf | 2011-03-18 11:42:58 +0800 | [diff] [blame] | 1041 | kfree_rcu(old_ptbl, rcu_head); |
Jens Axboe | a6f2365 | 2008-10-24 12:52:42 +0200 | [diff] [blame] | 1042 | } |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1043 | } |
| 1044 | |
| 1045 | /** |
| 1046 | * disk_expand_part_tbl - expand disk->part_tbl |
| 1047 | * @disk: disk to expand part_tbl for |
| 1048 | * @partno: expand such that this partno can fit in |
| 1049 | * |
| 1050 | * Expand disk->part_tbl such that @partno can fit in. disk->part_tbl |
| 1051 | * uses RCU to allow unlocked dereferencing for stats and other stuff. |
| 1052 | * |
| 1053 | * LOCKING: |
| 1054 | * Matching bd_mutex locked, might sleep. |
| 1055 | * |
| 1056 | * RETURNS: |
| 1057 | * 0 on success, -errno on failure. |
| 1058 | */ |
| 1059 | int disk_expand_part_tbl(struct gendisk *disk, int partno) |
| 1060 | { |
| 1061 | struct disk_part_tbl *old_ptbl = disk->part_tbl; |
| 1062 | struct disk_part_tbl *new_ptbl; |
| 1063 | int len = old_ptbl ? old_ptbl->len : 0; |
| 1064 | int target = partno + 1; |
| 1065 | size_t size; |
| 1066 | int i; |
| 1067 | |
| 1068 | /* disk_max_parts() is zero during initialization, ignore if so */ |
| 1069 | if (disk_max_parts(disk) && target > disk_max_parts(disk)) |
| 1070 | return -EINVAL; |
| 1071 | |
| 1072 | if (target <= len) |
| 1073 | return 0; |
| 1074 | |
| 1075 | size = sizeof(*new_ptbl) + target * sizeof(new_ptbl->part[0]); |
| 1076 | new_ptbl = kzalloc_node(size, GFP_KERNEL, disk->node_id); |
| 1077 | if (!new_ptbl) |
| 1078 | return -ENOMEM; |
| 1079 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1080 | new_ptbl->len = target; |
| 1081 | |
| 1082 | for (i = 0; i < len; i++) |
| 1083 | rcu_assign_pointer(new_ptbl->part[i], old_ptbl->part[i]); |
| 1084 | |
| 1085 | disk_replace_part_tbl(disk, new_ptbl); |
| 1086 | return 0; |
| 1087 | } |
| 1088 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1089 | static void disk_release(struct device *dev) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1091 | struct gendisk *disk = dev_to_disk(dev); |
| 1092 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1093 | disk_release_events(disk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | kfree(disk->random); |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1095 | disk_replace_part_tbl(disk, NULL); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 1096 | free_part_stats(&disk->part0); |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 1097 | free_part_info(&disk->part0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | kfree(disk); |
| 1099 | } |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1100 | struct class block_class = { |
| 1101 | .name = "block", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | }; |
| 1103 | |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 1104 | static char *block_devnode(struct device *dev, mode_t *mode) |
Kay Sievers | b03f38b | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 1105 | { |
| 1106 | struct gendisk *disk = dev_to_disk(dev); |
| 1107 | |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 1108 | if (disk->devnode) |
| 1109 | return disk->devnode(disk, mode); |
Kay Sievers | b03f38b | 2009-04-30 15:23:42 +0200 | [diff] [blame] | 1110 | return NULL; |
| 1111 | } |
| 1112 | |
Adrian Bunk | 1826ead | 2008-03-04 11:23:46 +0100 | [diff] [blame] | 1113 | static struct device_type disk_type = { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1114 | .name = "disk", |
| 1115 | .groups = disk_attr_groups, |
| 1116 | .release = disk_release, |
Kay Sievers | e454cea | 2009-09-18 23:01:12 +0200 | [diff] [blame] | 1117 | .devnode = block_devnode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | }; |
| 1119 | |
Randy Dunlap | a6e2ba8 | 2008-05-23 09:44:11 -0700 | [diff] [blame] | 1120 | #ifdef CONFIG_PROC_FS |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1121 | /* |
| 1122 | * aggregate disk stat collector. Uses the same stats that the sysfs |
| 1123 | * entries do, above, but makes them available through one seq_file. |
| 1124 | * |
| 1125 | * The output looks suspiciously like /proc/partitions with a bunch of |
| 1126 | * extra fields. |
| 1127 | */ |
| 1128 | static int diskstats_show(struct seq_file *seqf, void *v) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | { |
| 1130 | struct gendisk *gp = v; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 1131 | struct disk_part_iter piter; |
| 1132 | struct hd_struct *hd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1133 | char buf[BDEVNAME_SIZE]; |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 1134 | int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1135 | |
| 1136 | /* |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1137 | if (&disk_to_dev(gp)->kobj.entry == block_class.devices.next) |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1138 | seq_puts(seqf, "major minor name" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | " rio rmerge rsect ruse wio wmerge " |
| 1140 | "wsect wuse running use aveq" |
| 1141 | "\n\n"); |
| 1142 | */ |
| 1143 | |
Tejun Heo | 71982a4 | 2009-04-17 08:34:48 +0200 | [diff] [blame] | 1144 | disk_part_iter_init(&piter, gp, DISK_PITER_INCL_EMPTY_PART0); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 1145 | while ((hd = disk_part_iter_next(&piter))) { |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 1146 | cpu = part_stat_lock(); |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 1147 | part_round_stats(cpu, hd); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 1148 | part_stat_unlock(); |
Tejun Heo | 1f01429 | 2008-08-25 19:47:23 +0900 | [diff] [blame] | 1149 | seq_printf(seqf, "%4d %7d %s %lu %lu %llu " |
Jerome Marchand | 28f39d5 | 2008-02-08 11:04:56 +0100 | [diff] [blame] | 1150 | "%u %lu %lu %llu %u %u %u %u\n", |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 1151 | MAJOR(part_devt(hd)), MINOR(part_devt(hd)), |
| 1152 | disk_name(gp, hd->partno, buf), |
Liu Yuan | 53f2295 | 2011-03-02 11:00:15 -0500 | [diff] [blame] | 1153 | part_stat_read(hd, ios[READ]), |
| 1154 | part_stat_read(hd, merges[READ]), |
| 1155 | (unsigned long long)part_stat_read(hd, sectors[READ]), |
| 1156 | jiffies_to_msecs(part_stat_read(hd, ticks[READ])), |
| 1157 | part_stat_read(hd, ios[WRITE]), |
| 1158 | part_stat_read(hd, merges[WRITE]), |
| 1159 | (unsigned long long)part_stat_read(hd, sectors[WRITE]), |
| 1160 | jiffies_to_msecs(part_stat_read(hd, ticks[WRITE])), |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 1161 | part_in_flight(hd), |
Jerome Marchand | 28f39d5 | 2008-02-08 11:04:56 +0100 | [diff] [blame] | 1162 | jiffies_to_msecs(part_stat_read(hd, io_ticks)), |
| 1163 | jiffies_to_msecs(part_stat_read(hd, time_in_queue)) |
| 1164 | ); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | } |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 1166 | disk_part_iter_exit(&piter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | |
| 1168 | return 0; |
| 1169 | } |
| 1170 | |
Alexey Dobriyan | 31d85ab | 2008-10-06 12:55:38 +0400 | [diff] [blame] | 1171 | static const struct seq_operations diskstats_op = { |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1172 | .start = disk_seqf_start, |
| 1173 | .next = disk_seqf_next, |
| 1174 | .stop = disk_seqf_stop, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1175 | .show = diskstats_show |
| 1176 | }; |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 1177 | |
Alexey Dobriyan | 31d85ab | 2008-10-06 12:55:38 +0400 | [diff] [blame] | 1178 | static int diskstats_open(struct inode *inode, struct file *file) |
| 1179 | { |
| 1180 | return seq_open(file, &diskstats_op); |
| 1181 | } |
| 1182 | |
| 1183 | static const struct file_operations proc_diskstats_operations = { |
| 1184 | .open = diskstats_open, |
| 1185 | .read = seq_read, |
| 1186 | .llseek = seq_lseek, |
| 1187 | .release = seq_release, |
| 1188 | }; |
| 1189 | |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 1190 | static int __init proc_genhd_init(void) |
| 1191 | { |
Alexey Dobriyan | 31d85ab | 2008-10-06 12:55:38 +0400 | [diff] [blame] | 1192 | proc_create("diskstats", 0, NULL, &proc_diskstats_operations); |
Alexey Dobriyan | f500975 | 2008-10-04 23:53:21 +0400 | [diff] [blame] | 1193 | proc_create("partitions", 0, NULL, &proc_partitions_operations); |
| 1194 | return 0; |
| 1195 | } |
| 1196 | module_init(proc_genhd_init); |
Randy Dunlap | a6e2ba8 | 2008-05-23 09:44:11 -0700 | [diff] [blame] | 1197 | #endif /* CONFIG_PROC_FS */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1199 | dev_t blk_lookup_devt(const char *name, int partno) |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1200 | { |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1201 | dev_t devt = MKDEV(0, 0); |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1202 | struct class_dev_iter iter; |
| 1203 | struct device *dev; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1204 | |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1205 | class_dev_iter_init(&iter, &block_class, NULL, &disk_type); |
| 1206 | while ((dev = class_dev_iter_next(&iter))) { |
| 1207 | struct gendisk *disk = dev_to_disk(dev); |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 1208 | struct hd_struct *part; |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1209 | |
Kay Sievers | 3ada8b7 | 2009-01-06 10:44:43 -0800 | [diff] [blame] | 1210 | if (strcmp(dev_name(dev), name)) |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 1211 | continue; |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 1212 | |
Neil Brown | 41b8c85 | 2009-02-18 10:33:59 +0100 | [diff] [blame] | 1213 | if (partno < disk->minors) { |
| 1214 | /* We need to return the right devno, even |
| 1215 | * if the partition doesn't exist yet. |
| 1216 | */ |
| 1217 | devt = MKDEV(MAJOR(dev->devt), |
| 1218 | MINOR(dev->devt) + partno); |
| 1219 | break; |
| 1220 | } |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 1221 | part = disk_get_part(disk, partno); |
Tejun Heo | 2bbedcb | 2008-08-29 11:41:51 +0200 | [diff] [blame] | 1222 | if (part) { |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 1223 | devt = part_devt(part); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 1224 | disk_put_part(part); |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 1225 | break; |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1226 | } |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 1227 | disk_put_part(part); |
Kay Sievers | 5c0ef6d | 2008-08-16 14:30:30 +0200 | [diff] [blame] | 1228 | } |
Tejun Heo | def4e38 | 2008-09-03 08:57:12 +0200 | [diff] [blame] | 1229 | class_dev_iter_exit(&iter); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1230 | return devt; |
| 1231 | } |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 1232 | EXPORT_SYMBOL(blk_lookup_devt); |
| 1233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | struct gendisk *alloc_disk(int minors) |
| 1235 | { |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 1236 | return alloc_disk_node(minors, -1); |
| 1237 | } |
Tejun Heo | 689d6fa | 2008-08-25 19:56:16 +0900 | [diff] [blame] | 1238 | EXPORT_SYMBOL(alloc_disk); |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 1239 | |
| 1240 | struct gendisk *alloc_disk_node(int minors, int node_id) |
| 1241 | { |
| 1242 | struct gendisk *disk; |
| 1243 | |
Christoph Lameter | 94f6030 | 2007-07-17 04:03:29 -0700 | [diff] [blame] | 1244 | disk = kmalloc_node(sizeof(struct gendisk), |
| 1245 | GFP_KERNEL | __GFP_ZERO, node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | if (disk) { |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 1247 | if (!init_part_stats(&disk->part0)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | kfree(disk); |
| 1249 | return NULL; |
| 1250 | } |
Cheng Renquan | bf91db1 | 2008-11-20 08:37:37 +0100 | [diff] [blame] | 1251 | disk->node_id = node_id; |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1252 | if (disk_expand_part_tbl(disk, 0)) { |
| 1253 | free_part_stats(&disk->part0); |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 1254 | kfree(disk); |
| 1255 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1256 | } |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 1257 | disk->part_tbl->part[0] = &disk->part0; |
Jens Axboe | 6c23a96 | 2011-01-07 08:43:37 +0100 | [diff] [blame] | 1258 | |
| 1259 | hd_ref_init(&disk->part0); |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 1260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | disk->minors = minors; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1262 | rand_initialize_disk(disk); |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1263 | disk_to_dev(disk)->class = &block_class; |
| 1264 | disk_to_dev(disk)->type = &disk_type; |
| 1265 | device_initialize(disk_to_dev(disk)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1266 | } |
| 1267 | return disk; |
| 1268 | } |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 1269 | EXPORT_SYMBOL(alloc_disk_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
| 1271 | struct kobject *get_disk(struct gendisk *disk) |
| 1272 | { |
| 1273 | struct module *owner; |
| 1274 | struct kobject *kobj; |
| 1275 | |
| 1276 | if (!disk->fops) |
| 1277 | return NULL; |
| 1278 | owner = disk->fops->owner; |
| 1279 | if (owner && !try_module_get(owner)) |
| 1280 | return NULL; |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1281 | kobj = kobject_get(&disk_to_dev(disk)->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1282 | if (kobj == NULL) { |
| 1283 | module_put(owner); |
| 1284 | return NULL; |
| 1285 | } |
| 1286 | return kobj; |
| 1287 | |
| 1288 | } |
| 1289 | |
| 1290 | EXPORT_SYMBOL(get_disk); |
| 1291 | |
| 1292 | void put_disk(struct gendisk *disk) |
| 1293 | { |
| 1294 | if (disk) |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 1295 | kobject_put(&disk_to_dev(disk)->kobj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | } |
| 1297 | |
| 1298 | EXPORT_SYMBOL(put_disk); |
| 1299 | |
Hannes Reinecke | e3264a4 | 2009-07-28 09:13:13 +0200 | [diff] [blame] | 1300 | static void set_disk_ro_uevent(struct gendisk *gd, int ro) |
| 1301 | { |
| 1302 | char event[] = "DISK_RO=1"; |
| 1303 | char *envp[] = { event, NULL }; |
| 1304 | |
| 1305 | if (!ro) |
| 1306 | event[8] = '0'; |
| 1307 | kobject_uevent_env(&disk_to_dev(gd)->kobj, KOBJ_CHANGE, envp); |
| 1308 | } |
| 1309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1310 | void set_device_ro(struct block_device *bdev, int flag) |
| 1311 | { |
Tejun Heo | b7db995 | 2008-08-25 19:56:10 +0900 | [diff] [blame] | 1312 | bdev->bd_part->policy = flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | } |
| 1314 | |
| 1315 | EXPORT_SYMBOL(set_device_ro); |
| 1316 | |
| 1317 | void set_disk_ro(struct gendisk *disk, int flag) |
| 1318 | { |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 1319 | struct disk_part_iter piter; |
| 1320 | struct hd_struct *part; |
| 1321 | |
Hannes Reinecke | e3264a4 | 2009-07-28 09:13:13 +0200 | [diff] [blame] | 1322 | if (disk->part0.policy != flag) { |
| 1323 | set_disk_ro_uevent(disk, flag); |
| 1324 | disk->part0.policy = flag; |
| 1325 | } |
| 1326 | |
| 1327 | disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 1328 | while ((part = disk_part_iter_next(&piter))) |
| 1329 | part->policy = flag; |
| 1330 | disk_part_iter_exit(&piter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1331 | } |
| 1332 | |
| 1333 | EXPORT_SYMBOL(set_disk_ro); |
| 1334 | |
| 1335 | int bdev_read_only(struct block_device *bdev) |
| 1336 | { |
| 1337 | if (!bdev) |
| 1338 | return 0; |
Tejun Heo | b7db995 | 2008-08-25 19:56:10 +0900 | [diff] [blame] | 1339 | return bdev->bd_part->policy; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | } |
| 1341 | |
| 1342 | EXPORT_SYMBOL(bdev_read_only); |
| 1343 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1344 | int invalidate_partition(struct gendisk *disk, int partno) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1345 | { |
| 1346 | int res = 0; |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 1347 | struct block_device *bdev = bdget_disk(disk, partno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1348 | if (bdev) { |
Christoph Hellwig | 2ef4163 | 2005-05-05 16:15:59 -0700 | [diff] [blame] | 1349 | fsync_bdev(bdev); |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 1350 | res = __invalidate_device(bdev, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | bdput(bdev); |
| 1352 | } |
| 1353 | return res; |
| 1354 | } |
| 1355 | |
| 1356 | EXPORT_SYMBOL(invalidate_partition); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1357 | |
| 1358 | /* |
| 1359 | * Disk events - monitor disk events like media change and eject request. |
| 1360 | */ |
| 1361 | struct disk_events { |
| 1362 | struct list_head node; /* all disk_event's */ |
| 1363 | struct gendisk *disk; /* the associated disk */ |
| 1364 | spinlock_t lock; |
| 1365 | |
Tejun Heo | fdd514e | 2011-06-09 20:43:59 +0200 | [diff] [blame] | 1366 | struct mutex block_mutex; /* protects blocking */ |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1367 | int block; /* event blocking depth */ |
| 1368 | unsigned int pending; /* events already sent out */ |
| 1369 | unsigned int clearing; /* events being cleared */ |
| 1370 | |
| 1371 | long poll_msecs; /* interval, -1 for default */ |
| 1372 | struct delayed_work dwork; |
| 1373 | }; |
| 1374 | |
| 1375 | static const char *disk_events_strs[] = { |
| 1376 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "media_change", |
| 1377 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "eject_request", |
| 1378 | }; |
| 1379 | |
| 1380 | static char *disk_uevents[] = { |
| 1381 | [ilog2(DISK_EVENT_MEDIA_CHANGE)] = "DISK_MEDIA_CHANGE=1", |
| 1382 | [ilog2(DISK_EVENT_EJECT_REQUEST)] = "DISK_EJECT_REQUEST=1", |
| 1383 | }; |
| 1384 | |
| 1385 | /* list of all disk_events */ |
| 1386 | static DEFINE_MUTEX(disk_events_mutex); |
| 1387 | static LIST_HEAD(disk_events); |
| 1388 | |
| 1389 | /* disable in-kernel polling by default */ |
| 1390 | static unsigned long disk_events_dfl_poll_msecs = 0; |
| 1391 | |
| 1392 | static unsigned long disk_events_poll_jiffies(struct gendisk *disk) |
| 1393 | { |
| 1394 | struct disk_events *ev = disk->ev; |
| 1395 | long intv_msecs = 0; |
| 1396 | |
| 1397 | /* |
| 1398 | * If device-specific poll interval is set, always use it. If |
| 1399 | * the default is being used, poll iff there are events which |
| 1400 | * can't be monitored asynchronously. |
| 1401 | */ |
| 1402 | if (ev->poll_msecs >= 0) |
| 1403 | intv_msecs = ev->poll_msecs; |
| 1404 | else if (disk->events & ~disk->async_events) |
| 1405 | intv_msecs = disk_events_dfl_poll_msecs; |
| 1406 | |
| 1407 | return msecs_to_jiffies(intv_msecs); |
| 1408 | } |
| 1409 | |
Tejun Heo | c3af54a | 2011-06-09 20:43:55 +0200 | [diff] [blame] | 1410 | /** |
| 1411 | * disk_block_events - block and flush disk event checking |
| 1412 | * @disk: disk to block events for |
| 1413 | * |
| 1414 | * On return from this function, it is guaranteed that event checking |
| 1415 | * isn't in progress and won't happen until unblocked by |
| 1416 | * disk_unblock_events(). Events blocking is counted and the actual |
| 1417 | * unblocking happens after the matching number of unblocks are done. |
| 1418 | * |
| 1419 | * Note that this intentionally does not block event checking from |
| 1420 | * disk_clear_events(). |
| 1421 | * |
| 1422 | * CONTEXT: |
| 1423 | * Might sleep. |
| 1424 | */ |
| 1425 | void disk_block_events(struct gendisk *disk) |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1426 | { |
| 1427 | struct disk_events *ev = disk->ev; |
| 1428 | unsigned long flags; |
| 1429 | bool cancel; |
| 1430 | |
Tejun Heo | c3af54a | 2011-06-09 20:43:55 +0200 | [diff] [blame] | 1431 | if (!ev) |
| 1432 | return; |
| 1433 | |
Tejun Heo | fdd514e | 2011-06-09 20:43:59 +0200 | [diff] [blame] | 1434 | /* |
| 1435 | * Outer mutex ensures that the first blocker completes canceling |
| 1436 | * the event work before further blockers are allowed to finish. |
| 1437 | */ |
| 1438 | mutex_lock(&ev->block_mutex); |
| 1439 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1440 | spin_lock_irqsave(&ev->lock, flags); |
| 1441 | cancel = !ev->block++; |
| 1442 | spin_unlock_irqrestore(&ev->lock, flags); |
| 1443 | |
Tejun Heo | c3af54a | 2011-06-09 20:43:55 +0200 | [diff] [blame] | 1444 | if (cancel) |
| 1445 | cancel_delayed_work_sync(&disk->ev->dwork); |
Tejun Heo | fdd514e | 2011-06-09 20:43:59 +0200 | [diff] [blame] | 1446 | |
| 1447 | mutex_unlock(&ev->block_mutex); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1448 | } |
| 1449 | |
| 1450 | static void __disk_unblock_events(struct gendisk *disk, bool check_now) |
| 1451 | { |
| 1452 | struct disk_events *ev = disk->ev; |
| 1453 | unsigned long intv; |
| 1454 | unsigned long flags; |
| 1455 | |
| 1456 | spin_lock_irqsave(&ev->lock, flags); |
| 1457 | |
| 1458 | if (WARN_ON_ONCE(ev->block <= 0)) |
| 1459 | goto out_unlock; |
| 1460 | |
| 1461 | if (--ev->block) |
| 1462 | goto out_unlock; |
| 1463 | |
| 1464 | /* |
| 1465 | * Not exactly a latency critical operation, set poll timer |
| 1466 | * slack to 25% and kick event check. |
| 1467 | */ |
| 1468 | intv = disk_events_poll_jiffies(disk); |
| 1469 | set_timer_slack(&ev->dwork.timer, intv / 4); |
| 1470 | if (check_now) |
| 1471 | queue_delayed_work(system_nrt_wq, &ev->dwork, 0); |
| 1472 | else if (intv) |
| 1473 | queue_delayed_work(system_nrt_wq, &ev->dwork, intv); |
| 1474 | out_unlock: |
| 1475 | spin_unlock_irqrestore(&ev->lock, flags); |
| 1476 | } |
| 1477 | |
| 1478 | /** |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1479 | * disk_unblock_events - unblock disk event checking |
| 1480 | * @disk: disk to unblock events for |
| 1481 | * |
| 1482 | * Undo disk_block_events(). When the block count reaches zero, it |
| 1483 | * starts events polling if configured. |
| 1484 | * |
| 1485 | * CONTEXT: |
| 1486 | * Don't care. Safe to call from irq context. |
| 1487 | */ |
| 1488 | void disk_unblock_events(struct gendisk *disk) |
| 1489 | { |
| 1490 | if (disk->ev) |
Tejun Heo | facc31d | 2011-03-09 19:54:27 +0100 | [diff] [blame] | 1491 | __disk_unblock_events(disk, false); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1492 | } |
| 1493 | |
| 1494 | /** |
| 1495 | * disk_check_events - schedule immediate event checking |
| 1496 | * @disk: disk to check events for |
| 1497 | * |
| 1498 | * Schedule immediate event checking on @disk if not blocked. |
| 1499 | * |
| 1500 | * CONTEXT: |
| 1501 | * Don't care. Safe to call from irq context. |
| 1502 | */ |
| 1503 | void disk_check_events(struct gendisk *disk) |
| 1504 | { |
Tejun Heo | a9dce2a | 2011-06-09 20:43:54 +0200 | [diff] [blame] | 1505 | struct disk_events *ev = disk->ev; |
| 1506 | unsigned long flags; |
| 1507 | |
| 1508 | if (!ev) |
| 1509 | return; |
| 1510 | |
| 1511 | spin_lock_irqsave(&ev->lock, flags); |
| 1512 | if (!ev->block) { |
| 1513 | cancel_delayed_work(&ev->dwork); |
| 1514 | queue_delayed_work(system_nrt_wq, &ev->dwork, 0); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1515 | } |
Tejun Heo | a9dce2a | 2011-06-09 20:43:54 +0200 | [diff] [blame] | 1516 | spin_unlock_irqrestore(&ev->lock, flags); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1517 | } |
| 1518 | EXPORT_SYMBOL_GPL(disk_check_events); |
| 1519 | |
| 1520 | /** |
| 1521 | * disk_clear_events - synchronously check, clear and return pending events |
| 1522 | * @disk: disk to fetch and clear events from |
| 1523 | * @mask: mask of events to be fetched and clearted |
| 1524 | * |
| 1525 | * Disk events are synchronously checked and pending events in @mask |
| 1526 | * are cleared and returned. This ignores the block count. |
| 1527 | * |
| 1528 | * CONTEXT: |
| 1529 | * Might sleep. |
| 1530 | */ |
| 1531 | unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask) |
| 1532 | { |
| 1533 | const struct block_device_operations *bdops = disk->fops; |
| 1534 | struct disk_events *ev = disk->ev; |
| 1535 | unsigned int pending; |
| 1536 | |
| 1537 | if (!ev) { |
| 1538 | /* for drivers still using the old ->media_changed method */ |
| 1539 | if ((mask & DISK_EVENT_MEDIA_CHANGE) && |
| 1540 | bdops->media_changed && bdops->media_changed(disk)) |
| 1541 | return DISK_EVENT_MEDIA_CHANGE; |
| 1542 | return 0; |
| 1543 | } |
| 1544 | |
| 1545 | /* tell the workfn about the events being cleared */ |
| 1546 | spin_lock_irq(&ev->lock); |
| 1547 | ev->clearing |= mask; |
| 1548 | spin_unlock_irq(&ev->lock); |
| 1549 | |
| 1550 | /* uncondtionally schedule event check and wait for it to finish */ |
Tejun Heo | c3af54a | 2011-06-09 20:43:55 +0200 | [diff] [blame] | 1551 | disk_block_events(disk); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1552 | queue_delayed_work(system_nrt_wq, &ev->dwork, 0); |
| 1553 | flush_delayed_work(&ev->dwork); |
| 1554 | __disk_unblock_events(disk, false); |
| 1555 | |
| 1556 | /* then, fetch and clear pending events */ |
| 1557 | spin_lock_irq(&ev->lock); |
| 1558 | WARN_ON_ONCE(ev->clearing & mask); /* cleared by workfn */ |
| 1559 | pending = ev->pending & mask; |
| 1560 | ev->pending &= ~mask; |
| 1561 | spin_unlock_irq(&ev->lock); |
| 1562 | |
| 1563 | return pending; |
| 1564 | } |
| 1565 | |
| 1566 | static void disk_events_workfn(struct work_struct *work) |
| 1567 | { |
| 1568 | struct delayed_work *dwork = to_delayed_work(work); |
| 1569 | struct disk_events *ev = container_of(dwork, struct disk_events, dwork); |
| 1570 | struct gendisk *disk = ev->disk; |
| 1571 | char *envp[ARRAY_SIZE(disk_uevents) + 1] = { }; |
| 1572 | unsigned int clearing = ev->clearing; |
| 1573 | unsigned int events; |
| 1574 | unsigned long intv; |
| 1575 | int nr_events = 0, i; |
| 1576 | |
| 1577 | /* check events */ |
| 1578 | events = disk->fops->check_events(disk, clearing); |
| 1579 | |
| 1580 | /* accumulate pending events and schedule next poll if necessary */ |
| 1581 | spin_lock_irq(&ev->lock); |
| 1582 | |
| 1583 | events &= ~ev->pending; |
| 1584 | ev->pending |= events; |
| 1585 | ev->clearing &= ~clearing; |
| 1586 | |
| 1587 | intv = disk_events_poll_jiffies(disk); |
| 1588 | if (!ev->block && intv) |
| 1589 | queue_delayed_work(system_nrt_wq, &ev->dwork, intv); |
| 1590 | |
| 1591 | spin_unlock_irq(&ev->lock); |
| 1592 | |
Tejun Heo | 7c88a16 | 2011-04-21 19:43:58 +0200 | [diff] [blame] | 1593 | /* |
| 1594 | * Tell userland about new events. Only the events listed in |
| 1595 | * @disk->events are reported. Unlisted events are processed the |
| 1596 | * same internally but never get reported to userland. |
| 1597 | */ |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1598 | for (i = 0; i < ARRAY_SIZE(disk_uevents); i++) |
Tejun Heo | 7c88a16 | 2011-04-21 19:43:58 +0200 | [diff] [blame] | 1599 | if (events & disk->events & (1 << i)) |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1600 | envp[nr_events++] = disk_uevents[i]; |
| 1601 | |
| 1602 | if (nr_events) |
| 1603 | kobject_uevent_env(&disk_to_dev(disk)->kobj, KOBJ_CHANGE, envp); |
| 1604 | } |
| 1605 | |
| 1606 | /* |
| 1607 | * A disk events enabled device has the following sysfs nodes under |
| 1608 | * its /sys/block/X/ directory. |
| 1609 | * |
| 1610 | * events : list of all supported events |
| 1611 | * events_async : list of events which can be detected w/o polling |
| 1612 | * events_poll_msecs : polling interval, 0: disable, -1: system default |
| 1613 | */ |
| 1614 | static ssize_t __disk_events_show(unsigned int events, char *buf) |
| 1615 | { |
| 1616 | const char *delim = ""; |
| 1617 | ssize_t pos = 0; |
| 1618 | int i; |
| 1619 | |
| 1620 | for (i = 0; i < ARRAY_SIZE(disk_events_strs); i++) |
| 1621 | if (events & (1 << i)) { |
| 1622 | pos += sprintf(buf + pos, "%s%s", |
| 1623 | delim, disk_events_strs[i]); |
| 1624 | delim = " "; |
| 1625 | } |
| 1626 | if (pos) |
| 1627 | pos += sprintf(buf + pos, "\n"); |
| 1628 | return pos; |
| 1629 | } |
| 1630 | |
| 1631 | static ssize_t disk_events_show(struct device *dev, |
| 1632 | struct device_attribute *attr, char *buf) |
| 1633 | { |
| 1634 | struct gendisk *disk = dev_to_disk(dev); |
| 1635 | |
| 1636 | return __disk_events_show(disk->events, buf); |
| 1637 | } |
| 1638 | |
| 1639 | static ssize_t disk_events_async_show(struct device *dev, |
| 1640 | struct device_attribute *attr, char *buf) |
| 1641 | { |
| 1642 | struct gendisk *disk = dev_to_disk(dev); |
| 1643 | |
| 1644 | return __disk_events_show(disk->async_events, buf); |
| 1645 | } |
| 1646 | |
| 1647 | static ssize_t disk_events_poll_msecs_show(struct device *dev, |
| 1648 | struct device_attribute *attr, |
| 1649 | char *buf) |
| 1650 | { |
| 1651 | struct gendisk *disk = dev_to_disk(dev); |
| 1652 | |
| 1653 | return sprintf(buf, "%ld\n", disk->ev->poll_msecs); |
| 1654 | } |
| 1655 | |
| 1656 | static ssize_t disk_events_poll_msecs_store(struct device *dev, |
| 1657 | struct device_attribute *attr, |
| 1658 | const char *buf, size_t count) |
| 1659 | { |
| 1660 | struct gendisk *disk = dev_to_disk(dev); |
| 1661 | long intv; |
| 1662 | |
| 1663 | if (!count || !sscanf(buf, "%ld", &intv)) |
| 1664 | return -EINVAL; |
| 1665 | |
| 1666 | if (intv < 0 && intv != -1) |
| 1667 | return -EINVAL; |
| 1668 | |
Tejun Heo | c3af54a | 2011-06-09 20:43:55 +0200 | [diff] [blame] | 1669 | disk_block_events(disk); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1670 | disk->ev->poll_msecs = intv; |
| 1671 | __disk_unblock_events(disk, true); |
| 1672 | |
| 1673 | return count; |
| 1674 | } |
| 1675 | |
| 1676 | static const DEVICE_ATTR(events, S_IRUGO, disk_events_show, NULL); |
| 1677 | static const DEVICE_ATTR(events_async, S_IRUGO, disk_events_async_show, NULL); |
| 1678 | static const DEVICE_ATTR(events_poll_msecs, S_IRUGO|S_IWUSR, |
| 1679 | disk_events_poll_msecs_show, |
| 1680 | disk_events_poll_msecs_store); |
| 1681 | |
| 1682 | static const struct attribute *disk_events_attrs[] = { |
| 1683 | &dev_attr_events.attr, |
| 1684 | &dev_attr_events_async.attr, |
| 1685 | &dev_attr_events_poll_msecs.attr, |
| 1686 | NULL, |
| 1687 | }; |
| 1688 | |
| 1689 | /* |
| 1690 | * The default polling interval can be specified by the kernel |
| 1691 | * parameter block.events_dfl_poll_msecs which defaults to 0 |
| 1692 | * (disable). This can also be modified runtime by writing to |
| 1693 | * /sys/module/block/events_dfl_poll_msecs. |
| 1694 | */ |
| 1695 | static int disk_events_set_dfl_poll_msecs(const char *val, |
| 1696 | const struct kernel_param *kp) |
| 1697 | { |
| 1698 | struct disk_events *ev; |
| 1699 | int ret; |
| 1700 | |
| 1701 | ret = param_set_ulong(val, kp); |
| 1702 | if (ret < 0) |
| 1703 | return ret; |
| 1704 | |
| 1705 | mutex_lock(&disk_events_mutex); |
| 1706 | |
| 1707 | list_for_each_entry(ev, &disk_events, node) |
| 1708 | disk_check_events(ev->disk); |
| 1709 | |
| 1710 | mutex_unlock(&disk_events_mutex); |
| 1711 | |
| 1712 | return 0; |
| 1713 | } |
| 1714 | |
| 1715 | static const struct kernel_param_ops disk_events_dfl_poll_msecs_param_ops = { |
| 1716 | .set = disk_events_set_dfl_poll_msecs, |
| 1717 | .get = param_get_ulong, |
| 1718 | }; |
| 1719 | |
| 1720 | #undef MODULE_PARAM_PREFIX |
| 1721 | #define MODULE_PARAM_PREFIX "block." |
| 1722 | |
| 1723 | module_param_cb(events_dfl_poll_msecs, &disk_events_dfl_poll_msecs_param_ops, |
| 1724 | &disk_events_dfl_poll_msecs, 0644); |
| 1725 | |
| 1726 | /* |
| 1727 | * disk_{add|del|release}_events - initialize and destroy disk_events. |
| 1728 | */ |
| 1729 | static void disk_add_events(struct gendisk *disk) |
| 1730 | { |
| 1731 | struct disk_events *ev; |
| 1732 | |
Tejun Heo | 75e3f3e | 2011-05-26 21:06:50 +0200 | [diff] [blame] | 1733 | if (!disk->fops->check_events) |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1734 | return; |
| 1735 | |
| 1736 | ev = kzalloc(sizeof(*ev), GFP_KERNEL); |
| 1737 | if (!ev) { |
| 1738 | pr_warn("%s: failed to initialize events\n", disk->disk_name); |
| 1739 | return; |
| 1740 | } |
| 1741 | |
| 1742 | if (sysfs_create_files(&disk_to_dev(disk)->kobj, |
| 1743 | disk_events_attrs) < 0) { |
| 1744 | pr_warn("%s: failed to create sysfs files for events\n", |
| 1745 | disk->disk_name); |
| 1746 | kfree(ev); |
| 1747 | return; |
| 1748 | } |
| 1749 | |
| 1750 | disk->ev = ev; |
| 1751 | |
| 1752 | INIT_LIST_HEAD(&ev->node); |
| 1753 | ev->disk = disk; |
| 1754 | spin_lock_init(&ev->lock); |
Tejun Heo | fdd514e | 2011-06-09 20:43:59 +0200 | [diff] [blame] | 1755 | mutex_init(&ev->block_mutex); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1756 | ev->block = 1; |
| 1757 | ev->poll_msecs = -1; |
| 1758 | INIT_DELAYED_WORK(&ev->dwork, disk_events_workfn); |
| 1759 | |
| 1760 | mutex_lock(&disk_events_mutex); |
| 1761 | list_add_tail(&ev->node, &disk_events); |
| 1762 | mutex_unlock(&disk_events_mutex); |
| 1763 | |
| 1764 | /* |
| 1765 | * Block count is initialized to 1 and the following initial |
| 1766 | * unblock kicks it into action. |
| 1767 | */ |
| 1768 | __disk_unblock_events(disk, true); |
| 1769 | } |
| 1770 | |
| 1771 | static void disk_del_events(struct gendisk *disk) |
| 1772 | { |
| 1773 | if (!disk->ev) |
| 1774 | return; |
| 1775 | |
Tejun Heo | c3af54a | 2011-06-09 20:43:55 +0200 | [diff] [blame] | 1776 | disk_block_events(disk); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 1777 | |
| 1778 | mutex_lock(&disk_events_mutex); |
| 1779 | list_del_init(&disk->ev->node); |
| 1780 | mutex_unlock(&disk_events_mutex); |
| 1781 | |
| 1782 | sysfs_remove_files(&disk_to_dev(disk)->kobj, disk_events_attrs); |
| 1783 | } |
| 1784 | |
| 1785 | static void disk_release_events(struct gendisk *disk) |
| 1786 | { |
| 1787 | /* the block count should be 1 from disk_del_events() */ |
| 1788 | WARN_ON_ONCE(disk->ev && disk->ev->block != 1); |
| 1789 | kfree(disk->ev); |
| 1790 | } |