Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef _LINUX_GENHD_H |
| 2 | #define _LINUX_GENHD_H |
| 3 | |
| 4 | /* |
| 5 | * genhd.h Copyright (C) 1992 Drew Eckhardt |
| 6 | * Generic hard disk header file by |
| 7 | * Drew Eckhardt |
| 8 | * |
| 9 | * <drew@colorado.edu> |
| 10 | */ |
| 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 13 | #include <linux/kdev_t.h> |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 14 | #include <linux/rcupdate.h> |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 15 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 17 | #ifdef CONFIG_BLOCK |
| 18 | |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 19 | #define dev_to_disk(device) container_of((device), struct gendisk, part0.__dev) |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 20 | #define dev_to_part(device) container_of((device), struct hd_struct, __dev) |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 21 | #define disk_to_dev(disk) (&(disk)->part0.__dev) |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 22 | #define part_to_dev(part) (&((part)->__dev)) |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 23 | |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 24 | extern struct device_type part_type; |
| 25 | extern struct kobject *block_depr; |
| 26 | extern struct class block_class; |
| 27 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | enum { |
| 29 | /* These three have identical behaviour; use the second one if DOS FDISK gets |
| 30 | confused about extended/logical partitions starting past cylinder 1023. */ |
| 31 | DOS_EXTENDED_PARTITION = 5, |
| 32 | LINUX_EXTENDED_PARTITION = 0x85, |
| 33 | WIN98_EXTENDED_PARTITION = 0x0f, |
| 34 | |
Fabio Massimo Di Nitto | d18d768 | 2007-02-10 23:50:00 -0800 | [diff] [blame] | 35 | SUN_WHOLE_DISK = DOS_EXTENDED_PARTITION, |
| 36 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | LINUX_SWAP_PARTITION = 0x82, |
Olaf Hering | 4419d1a | 2007-02-10 01:45:47 -0800 | [diff] [blame] | 38 | LINUX_DATA_PARTITION = 0x83, |
| 39 | LINUX_LVM_PARTITION = 0x8e, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | LINUX_RAID_PARTITION = 0xfd, /* autodetect RAID partition */ |
| 41 | |
| 42 | SOLARIS_X86_PARTITION = LINUX_SWAP_PARTITION, |
| 43 | NEW_SOLARIS_X86_PARTITION = 0xbf, |
| 44 | |
| 45 | DM6_AUX1PARTITION = 0x51, /* no DDO: use xlated geom */ |
| 46 | DM6_AUX3PARTITION = 0x53, /* no DDO: use xlated geom */ |
| 47 | DM6_PARTITION = 0x54, /* has DDO: use xlated geom & offset */ |
| 48 | EZD_PARTITION = 0x55, /* EZ-DRIVE */ |
| 49 | |
| 50 | FREEBSD_PARTITION = 0xa5, /* FreeBSD Partition ID */ |
| 51 | OPENBSD_PARTITION = 0xa6, /* OpenBSD Partition ID */ |
| 52 | NETBSD_PARTITION = 0xa9, /* NetBSD Partition ID */ |
| 53 | BSDI_PARTITION = 0xb7, /* BSDI Partition ID */ |
| 54 | MINIX_PARTITION = 0x81, /* Minix Partition ID */ |
| 55 | UNIXWARE_PARTITION = 0x63, /* Same as GNU_HURD and SCO Unix */ |
| 56 | }; |
| 57 | |
Tejun Heo | 689d6fa | 2008-08-25 19:56:16 +0900 | [diff] [blame] | 58 | #define DISK_MAX_PARTS 256 |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 59 | #define DISK_NAME_LEN 32 |
Tejun Heo | 689d6fa | 2008-08-25 19:56:16 +0900 | [diff] [blame] | 60 | |
David Woodhouse | 34186ef | 2006-04-25 14:07:57 +0100 | [diff] [blame] | 61 | #include <linux/major.h> |
| 62 | #include <linux/device.h> |
| 63 | #include <linux/smp.h> |
| 64 | #include <linux/string.h> |
| 65 | #include <linux/fs.h> |
Kristen Carlson Accardi | 8ce7ad7 | 2007-05-23 13:57:38 -0700 | [diff] [blame] | 66 | #include <linux/workqueue.h> |
David Woodhouse | 34186ef | 2006-04-25 14:07:57 +0100 | [diff] [blame] | 67 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | struct partition { |
| 69 | unsigned char boot_ind; /* 0x80 - active */ |
| 70 | unsigned char head; /* starting head */ |
| 71 | unsigned char sector; /* starting sector */ |
| 72 | unsigned char cyl; /* starting cylinder */ |
| 73 | unsigned char sys_ind; /* What partition type */ |
| 74 | unsigned char end_head; /* end head */ |
| 75 | unsigned char end_sector; /* end sector */ |
| 76 | unsigned char end_cyl; /* end cylinder */ |
| 77 | __le32 start_sect; /* starting sector counting from 0 */ |
| 78 | __le32 nr_sects; /* nr of sectors in partition */ |
| 79 | } __attribute__((packed)); |
| 80 | |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 81 | struct disk_stats { |
| 82 | unsigned long sectors[2]; /* READs and WRITEs */ |
| 83 | unsigned long ios[2]; |
| 84 | unsigned long merges[2]; |
| 85 | unsigned long ticks[2]; |
| 86 | unsigned long io_ticks; |
| 87 | unsigned long time_in_queue; |
| 88 | }; |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 89 | |
| 90 | #define PARTITION_META_INFO_VOLNAMELTH 64 |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 91 | /* |
| 92 | * Enough for the string representation of any kind of UUID plus NULL. |
| 93 | * EFI UUID is 36 characters. MSDOS UUID is 11 characters. |
| 94 | */ |
| 95 | #define PARTITION_META_INFO_UUIDLTH 37 |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 96 | |
| 97 | struct partition_meta_info { |
Stephen Warren | 1ad7e89 | 2012-11-08 16:12:25 -0800 | [diff] [blame] | 98 | char uuid[PARTITION_META_INFO_UUIDLTH]; |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 99 | u8 volname[PARTITION_META_INFO_VOLNAMELTH]; |
| 100 | }; |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | struct hd_struct { |
| 103 | sector_t start_sect; |
Vivek Goyal | c83f6bf | 2012-08-01 12:24:18 +0200 | [diff] [blame] | 104 | /* |
| 105 | * nr_sects is protected by sequence counter. One might extend a |
| 106 | * partition while IO is happening to it and update of nr_sects |
| 107 | * can be non-atomic on 32bit machines with 64bit sector_t. |
| 108 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | sector_t nr_sects; |
Vivek Goyal | c83f6bf | 2012-08-01 12:24:18 +0200 | [diff] [blame] | 110 | seqcount_t nr_sects_seq; |
Martin K. Petersen | c72758f | 2009-05-22 17:17:53 -0400 | [diff] [blame] | 111 | sector_t alignment_offset; |
Jens Axboe | a1706ac | 2011-05-30 07:42:51 +0200 | [diff] [blame] | 112 | unsigned int discard_alignment; |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 113 | struct device __dev; |
Jun'ichi Nomura | 6a4d44c | 2006-03-27 01:17:55 -0800 | [diff] [blame] | 114 | struct kobject *holder_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | int policy, partno; |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 116 | struct partition_meta_info *info; |
Akinobu Mita | c17bb49 | 2006-12-08 02:39:46 -0800 | [diff] [blame] | 117 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 118 | int make_it_fail; |
| 119 | #endif |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 120 | unsigned long stamp; |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 121 | atomic_t in_flight[2]; |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 122 | #ifdef CONFIG_SMP |
Tejun Heo | 43cf38e | 2010-02-02 14:38:57 +0900 | [diff] [blame] | 123 | struct disk_stats __percpu *dkstats; |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 124 | #else |
| 125 | struct disk_stats dkstats; |
| 126 | #endif |
Jens Axboe | 6c23a96 | 2011-01-07 08:43:37 +0100 | [diff] [blame] | 127 | atomic_t ref; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 128 | struct rcu_head rcu_head; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | }; |
| 130 | |
| 131 | #define GENHD_FL_REMOVABLE 1 |
NeilBrown | 97fedbb | 2010-03-16 08:55:32 +0100 | [diff] [blame] | 132 | /* 2 is unused */ |
Kristen Carlson Accardi | 86ce18d | 2007-05-23 13:57:38 -0700 | [diff] [blame] | 133 | #define GENHD_FL_MEDIA_CHANGE_NOTIFY 4 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | #define GENHD_FL_CD 8 |
| 135 | #define GENHD_FL_UP 16 |
| 136 | #define GENHD_FL_SUPPRESS_PARTITION_INFO 32 |
Tejun Heo | 689d6fa | 2008-08-25 19:56:16 +0900 | [diff] [blame] | 137 | #define GENHD_FL_EXT_DEVT 64 /* allow extended devt */ |
Bartlomiej Zolnierkiewicz | db429e9 | 2009-06-07 13:52:52 +0200 | [diff] [blame] | 138 | #define GENHD_FL_NATIVE_CAPACITY 128 |
Tejun Heo | d4dc210 | 2011-04-21 20:54:46 +0200 | [diff] [blame] | 139 | #define GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE 256 |
Tejun Heo | d27769e | 2011-08-23 20:01:04 +0200 | [diff] [blame] | 140 | #define GENHD_FL_NO_PART_SCAN 512 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 142 | enum { |
| 143 | DISK_EVENT_MEDIA_CHANGE = 1 << 0, /* media changed */ |
| 144 | DISK_EVENT_EJECT_REQUEST = 1 << 1, /* eject requested */ |
| 145 | }; |
| 146 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 147 | #define BLK_SCSI_MAX_CMDS (256) |
| 148 | #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| 149 | |
| 150 | struct blk_scsi_cmd_filter { |
| 151 | unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
| 152 | unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
| 153 | struct kobject kobj; |
| 154 | }; |
| 155 | |
| 156 | struct disk_part_tbl { |
| 157 | struct rcu_head rcu_head; |
| 158 | int len; |
Arnd Bergmann | 4d2deb4 | 2010-02-24 20:01:56 +0100 | [diff] [blame] | 159 | struct hd_struct __rcu *last_lookup; |
| 160 | struct hd_struct __rcu *part[]; |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 161 | }; |
| 162 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 163 | struct disk_events; |
| 164 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 165 | struct gendisk { |
Tejun Heo | 689d6fa | 2008-08-25 19:56:16 +0900 | [diff] [blame] | 166 | /* major, first_minor and minors are input parameters only, |
| 167 | * don't use directly. Use disk_devt() and disk_max_parts(). |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 168 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | int major; /* major number of driver */ |
| 170 | int first_minor; |
| 171 | int minors; /* maximum number of minors, =1 for |
| 172 | * disks that can't be partitioned. */ |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 173 | |
Tejun Heo | 3e1a7ff | 2008-08-25 19:56:17 +0900 | [diff] [blame] | 174 | char disk_name[DISK_NAME_LEN]; /* name of major driver */ |
Al Viro | 2c9ede5 | 2011-07-23 20:24:48 -0400 | [diff] [blame] | 175 | char *(*devnode)(struct gendisk *gd, umode_t *mode); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 176 | |
| 177 | unsigned int events; /* supported events */ |
| 178 | unsigned int async_events; /* async events, subset of all */ |
| 179 | |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 180 | /* Array of pointers to partitions indexed by partno. |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 181 | * Protected with matching bdev lock but stat and other |
| 182 | * non-critical accesses use RCU. Always access through |
| 183 | * helpers. |
| 184 | */ |
Arnd Bergmann | 4d2deb4 | 2010-02-24 20:01:56 +0100 | [diff] [blame] | 185 | struct disk_part_tbl __rcu *part_tbl; |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 186 | struct hd_struct part0; |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 187 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 188 | const struct block_device_operations *fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | struct request_queue *queue; |
| 190 | void *private_data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | |
| 192 | int flags; |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 193 | struct device *driverfs_dev; // FIXME: remove |
Jun'ichi Nomura | 6a4d44c | 2006-03-27 01:17:55 -0800 | [diff] [blame] | 194 | struct kobject *slave_dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | |
| 196 | struct timer_rand_state *random; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | atomic_t sync_io; /* RAID */ |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 198 | struct disk_events *ev; |
Martin K. Petersen | 7ba1ba1 | 2008-06-30 20:04:41 +0200 | [diff] [blame] | 199 | #ifdef CONFIG_BLK_DEV_INTEGRITY |
| 200 | struct blk_integrity *integrity; |
| 201 | #endif |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 202 | int node_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | }; |
| 204 | |
Tejun Heo | 310a2c1 | 2008-08-25 19:47:17 +0900 | [diff] [blame] | 205 | static inline struct gendisk *part_to_disk(struct hd_struct *part) |
| 206 | { |
Tejun Heo | 548b10e | 2008-08-29 09:01:47 +0200 | [diff] [blame] | 207 | if (likely(part)) { |
| 208 | if (part->partno) |
| 209 | return dev_to_disk(part_to_dev(part)->parent); |
| 210 | else |
| 211 | return dev_to_disk(part_to_dev(part)); |
| 212 | } |
Tejun Heo | 310a2c1 | 2008-08-25 19:47:17 +0900 | [diff] [blame] | 213 | return NULL; |
| 214 | } |
| 215 | |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 216 | static inline void part_pack_uuid(const u8 *uuid_str, u8 *to) |
| 217 | { |
| 218 | int i; |
| 219 | for (i = 0; i < 16; ++i) { |
| 220 | *to++ = (hex_to_bin(*uuid_str) << 4) | |
| 221 | (hex_to_bin(*(uuid_str + 1))); |
| 222 | uuid_str += 2; |
| 223 | switch (i) { |
| 224 | case 3: |
| 225 | case 5: |
| 226 | case 7: |
| 227 | case 9: |
| 228 | uuid_str++; |
| 229 | continue; |
| 230 | } |
| 231 | } |
| 232 | } |
| 233 | |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 234 | static inline int disk_max_parts(struct gendisk *disk) |
| 235 | { |
Tejun Heo | 689d6fa | 2008-08-25 19:56:16 +0900 | [diff] [blame] | 236 | if (disk->flags & GENHD_FL_EXT_DEVT) |
| 237 | return DISK_MAX_PARTS; |
| 238 | return disk->minors; |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 239 | } |
| 240 | |
Tejun Heo | d27769e | 2011-08-23 20:01:04 +0200 | [diff] [blame] | 241 | static inline bool disk_part_scan_enabled(struct gendisk *disk) |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 242 | { |
Tejun Heo | d27769e | 2011-08-23 20:01:04 +0200 | [diff] [blame] | 243 | return disk_max_parts(disk) > 1 && |
| 244 | !(disk->flags & GENHD_FL_NO_PART_SCAN); |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 245 | } |
| 246 | |
| 247 | static inline dev_t disk_devt(struct gendisk *disk) |
| 248 | { |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 249 | return disk_to_dev(disk)->devt; |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | static inline dev_t part_devt(struct hd_struct *part) |
| 253 | { |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 254 | return part_to_dev(part)->devt; |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 255 | } |
| 256 | |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 257 | extern struct hd_struct *disk_get_part(struct gendisk *disk, int partno); |
| 258 | |
| 259 | static inline void disk_put_part(struct hd_struct *part) |
| 260 | { |
| 261 | if (likely(part)) |
Tejun Heo | ed9e198 | 2008-08-25 19:56:05 +0900 | [diff] [blame] | 262 | put_device(part_to_dev(part)); |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Smarter partition iterator without context limits. |
| 267 | */ |
| 268 | #define DISK_PITER_REVERSE (1 << 0) /* iterate in the reverse direction */ |
| 269 | #define DISK_PITER_INCL_EMPTY (1 << 1) /* include 0-sized parts */ |
Tejun Heo | b5d0b9d | 2008-09-03 09:06:42 +0200 | [diff] [blame] | 270 | #define DISK_PITER_INCL_PART0 (1 << 2) /* include partition 0 */ |
Tejun Heo | 71982a4 | 2009-04-17 08:34:48 +0200 | [diff] [blame] | 271 | #define DISK_PITER_INCL_EMPTY_PART0 (1 << 3) /* include empty partition 0 */ |
Tejun Heo | e71bf0d | 2008-09-03 09:03:02 +0200 | [diff] [blame] | 272 | |
| 273 | struct disk_part_iter { |
| 274 | struct gendisk *disk; |
| 275 | struct hd_struct *part; |
| 276 | int idx; |
| 277 | unsigned int flags; |
| 278 | }; |
| 279 | |
| 280 | extern void disk_part_iter_init(struct disk_part_iter *piter, |
| 281 | struct gendisk *disk, unsigned int flags); |
| 282 | extern struct hd_struct *disk_part_iter_next(struct disk_part_iter *piter); |
| 283 | extern void disk_part_iter_exit(struct disk_part_iter *piter); |
| 284 | |
| 285 | extern struct hd_struct *disk_map_sector_rcu(struct gendisk *disk, |
| 286 | sector_t sector); |
| 287 | |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 288 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | * Macros to operate on percpu disk statistics: |
| 290 | * |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 291 | * {disk|part|all}_stat_{add|sub|inc|dec}() modify the stat counters |
| 292 | * and should be called between disk_stat_lock() and |
| 293 | * disk_stat_unlock(). |
| 294 | * |
| 295 | * part_stat_read() can be called at any time. |
| 296 | * |
| 297 | * part_stat_{add|set_all}() and {init|free}_part_stats are for |
| 298 | * internal use only. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | */ |
| 300 | #ifdef CONFIG_SMP |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 301 | #define part_stat_lock() ({ rcu_read_lock(); get_cpu(); }) |
| 302 | #define part_stat_unlock() do { put_cpu(); rcu_read_unlock(); } while (0) |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 303 | |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 304 | #define __part_stat_add(cpu, part, field, addnd) \ |
| 305 | (per_cpu_ptr((part)->dkstats, (cpu))->field += (addnd)) |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 306 | |
| 307 | #define part_stat_read(part, field) \ |
| 308 | ({ \ |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 309 | typeof((part)->dkstats->field) res = 0; \ |
Stephen Hemminger | 7af92f8 | 2010-01-06 15:45:55 -0800 | [diff] [blame] | 310 | unsigned int _cpu; \ |
| 311 | for_each_possible_cpu(_cpu) \ |
| 312 | res += per_cpu_ptr((part)->dkstats, _cpu)->field; \ |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 313 | res; \ |
| 314 | }) |
| 315 | |
Jens Axboe | 28f1370 | 2008-05-07 10:15:46 +0200 | [diff] [blame] | 316 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
| 317 | { |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 318 | int i; |
Jens Axboe | 28f1370 | 2008-05-07 10:15:46 +0200 | [diff] [blame] | 319 | |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 320 | for_each_possible_cpu(i) |
| 321 | memset(per_cpu_ptr(part->dkstats, i), value, |
Jens Axboe | 28f1370 | 2008-05-07 10:15:46 +0200 | [diff] [blame] | 322 | sizeof(struct disk_stats)); |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 323 | } |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 324 | |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 325 | static inline int init_part_stats(struct hd_struct *part) |
| 326 | { |
| 327 | part->dkstats = alloc_percpu(struct disk_stats); |
| 328 | if (!part->dkstats) |
| 329 | return 0; |
| 330 | return 1; |
| 331 | } |
| 332 | |
| 333 | static inline void free_part_stats(struct hd_struct *part) |
| 334 | { |
| 335 | free_percpu(part->dkstats); |
| 336 | } |
| 337 | |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 338 | #else /* !CONFIG_SMP */ |
| 339 | #define part_stat_lock() ({ rcu_read_lock(); 0; }) |
| 340 | #define part_stat_unlock() rcu_read_unlock() |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 342 | #define __part_stat_add(cpu, part, field, addnd) \ |
| 343 | ((part)->dkstats.field += addnd) |
| 344 | |
| 345 | #define part_stat_read(part, field) ((part)->dkstats.field) |
| 346 | |
| 347 | static inline void part_stat_set_all(struct hd_struct *part, int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 349 | memset(&part->dkstats, value, sizeof(struct disk_stats)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
Jerome Marchand | ea5c48a | 2008-02-08 11:04:09 +0100 | [diff] [blame] | 351 | |
| 352 | static inline int init_part_stats(struct hd_struct *part) |
| 353 | { |
| 354 | return 1; |
| 355 | } |
| 356 | |
| 357 | static inline void free_part_stats(struct hd_struct *part) |
| 358 | { |
| 359 | } |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 360 | |
| 361 | #endif /* CONFIG_SMP */ |
| 362 | |
| 363 | #define part_stat_add(cpu, part, field, addnd) do { \ |
| 364 | __part_stat_add((cpu), (part), field, addnd); \ |
| 365 | if ((part)->partno) \ |
| 366 | __part_stat_add((cpu), &part_to_disk((part))->part0, \ |
| 367 | field, addnd); \ |
| 368 | } while (0) |
| 369 | |
| 370 | #define part_stat_dec(cpu, gendiskp, field) \ |
| 371 | part_stat_add(cpu, gendiskp, field, -1) |
| 372 | #define part_stat_inc(cpu, gendiskp, field) \ |
| 373 | part_stat_add(cpu, gendiskp, field, 1) |
| 374 | #define part_stat_sub(cpu, gendiskp, field, subnd) \ |
| 375 | part_stat_add(cpu, gendiskp, field, -subnd) |
| 376 | |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 377 | static inline void part_inc_in_flight(struct hd_struct *part, int rw) |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 378 | { |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 379 | atomic_inc(&part->in_flight[rw]); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 380 | if (part->partno) |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 381 | atomic_inc(&part_to_disk(part)->part0.in_flight[rw]); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 382 | } |
| 383 | |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 384 | static inline void part_dec_in_flight(struct hd_struct *part, int rw) |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 385 | { |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 386 | atomic_dec(&part->in_flight[rw]); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 387 | if (part->partno) |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 388 | atomic_dec(&part_to_disk(part)->part0.in_flight[rw]); |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 389 | } |
| 390 | |
| 391 | static inline int part_in_flight(struct hd_struct *part) |
| 392 | { |
Shaohua Li | 1e9bb88 | 2011-03-22 08:35:35 +0100 | [diff] [blame] | 393 | return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 394 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 396 | static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |
| 397 | { |
| 398 | if (disk) |
| 399 | return kzalloc_node(sizeof(struct partition_meta_info), |
| 400 | GFP_KERNEL, disk->node_id); |
| 401 | return kzalloc(sizeof(struct partition_meta_info), GFP_KERNEL); |
| 402 | } |
| 403 | |
| 404 | static inline void free_part_info(struct hd_struct *part) |
| 405 | { |
| 406 | kfree(part->info); |
| 407 | } |
| 408 | |
Petros Koutoupis | d399228 | 2009-03-11 10:49:35 +0100 | [diff] [blame] | 409 | /* block/blk-core.c */ |
Tejun Heo | c995905 | 2008-08-25 19:47:21 +0900 | [diff] [blame] | 410 | extern void part_round_stats(int cpu, struct hd_struct *part); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | |
Petros Koutoupis | 32ca163 | 2009-03-10 08:25:54 +0100 | [diff] [blame] | 412 | /* block/genhd.c */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | extern void add_disk(struct gendisk *disk); |
| 414 | extern void del_gendisk(struct gendisk *gp); |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 415 | extern struct gendisk *get_gendisk(dev_t dev, int *partno); |
Tejun Heo | f331c02 | 2008-09-03 09:01:48 +0200 | [diff] [blame] | 416 | extern struct block_device *bdget_disk(struct gendisk *disk, int partno); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | |
| 418 | extern void set_device_ro(struct block_device *bdev, int flag); |
| 419 | extern void set_disk_ro(struct gendisk *disk, int flag); |
| 420 | |
Tejun Heo | b7db995 | 2008-08-25 19:56:10 +0900 | [diff] [blame] | 421 | static inline int get_disk_ro(struct gendisk *disk) |
| 422 | { |
| 423 | return disk->part0.policy; |
| 424 | } |
| 425 | |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 426 | extern void disk_block_events(struct gendisk *disk); |
| 427 | extern void disk_unblock_events(struct gendisk *disk); |
Tejun Heo | 85ef06d | 2011-07-01 16:17:47 +0200 | [diff] [blame] | 428 | extern void disk_flush_events(struct gendisk *disk, unsigned int mask); |
Tejun Heo | 77ea887 | 2010-12-08 20:57:37 +0100 | [diff] [blame] | 429 | extern unsigned int disk_clear_events(struct gendisk *disk, unsigned int mask); |
| 430 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | /* drivers/char/random.c */ |
| 432 | extern void add_disk_randomness(struct gendisk *disk); |
| 433 | extern void rand_initialize_disk(struct gendisk *disk); |
| 434 | |
| 435 | static inline sector_t get_start_sect(struct block_device *bdev) |
| 436 | { |
Tejun Heo | 0762b8b | 2008-08-25 19:56:12 +0900 | [diff] [blame] | 437 | return bdev->bd_part->start_sect; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | } |
| 439 | static inline sector_t get_capacity(struct gendisk *disk) |
| 440 | { |
Tejun Heo | 80795ae | 2008-08-25 19:56:07 +0900 | [diff] [blame] | 441 | return disk->part0.nr_sects; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | } |
| 443 | static inline void set_capacity(struct gendisk *disk, sector_t size) |
| 444 | { |
Tejun Heo | 80795ae | 2008-08-25 19:56:07 +0900 | [diff] [blame] | 445 | disk->part0.nr_sects = size; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | } |
| 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | #ifdef CONFIG_SOLARIS_X86_PARTITION |
| 449 | |
Mark Fortescue | b84d879 | 2007-07-25 18:30:08 -0700 | [diff] [blame] | 450 | #define SOLARIS_X86_NUMSLICE 16 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | #define SOLARIS_X86_VTOC_SANE (0x600DDEEEUL) |
| 452 | |
| 453 | struct solaris_x86_slice { |
| 454 | __le16 s_tag; /* ID tag of partition */ |
| 455 | __le16 s_flag; /* permission flags */ |
| 456 | __le32 s_start; /* start sector no of partition */ |
| 457 | __le32 s_size; /* # of blocks in partition */ |
| 458 | }; |
| 459 | |
| 460 | struct solaris_x86_vtoc { |
| 461 | unsigned int v_bootinfo[3]; /* info needed by mboot (unsupported) */ |
| 462 | __le32 v_sanity; /* to verify vtoc sanity */ |
| 463 | __le32 v_version; /* layout version */ |
| 464 | char v_volume[8]; /* volume name */ |
| 465 | __le16 v_sectorsz; /* sector size in bytes */ |
| 466 | __le16 v_nparts; /* number of partitions */ |
| 467 | unsigned int v_reserved[10]; /* free space */ |
| 468 | struct solaris_x86_slice |
| 469 | v_slice[SOLARIS_X86_NUMSLICE]; /* slice headers */ |
| 470 | unsigned int timestamp[SOLARIS_X86_NUMSLICE]; /* timestamp (unsupported) */ |
| 471 | char v_asciilabel[128]; /* for compatibility */ |
| 472 | }; |
| 473 | |
| 474 | #endif /* CONFIG_SOLARIS_X86_PARTITION */ |
| 475 | |
| 476 | #ifdef CONFIG_BSD_DISKLABEL |
| 477 | /* |
| 478 | * BSD disklabel support by Yossi Gottlieb <yogo@math.tau.ac.il> |
| 479 | * updated by Marc Espie <Marc.Espie@openbsd.org> |
| 480 | */ |
| 481 | |
| 482 | /* check against BSD src/sys/sys/disklabel.h for consistency */ |
| 483 | |
| 484 | #define BSD_DISKMAGIC (0x82564557UL) /* The disk magic number */ |
| 485 | #define BSD_MAXPARTITIONS 16 |
| 486 | #define OPENBSD_MAXPARTITIONS 16 |
| 487 | #define BSD_FS_UNUSED 0 /* disklabel unused partition entry ID */ |
| 488 | struct bsd_disklabel { |
| 489 | __le32 d_magic; /* the magic number */ |
| 490 | __s16 d_type; /* drive type */ |
| 491 | __s16 d_subtype; /* controller/d_type specific */ |
| 492 | char d_typename[16]; /* type name, e.g. "eagle" */ |
| 493 | char d_packname[16]; /* pack identifier */ |
| 494 | __u32 d_secsize; /* # of bytes per sector */ |
| 495 | __u32 d_nsectors; /* # of data sectors per track */ |
| 496 | __u32 d_ntracks; /* # of tracks per cylinder */ |
| 497 | __u32 d_ncylinders; /* # of data cylinders per unit */ |
| 498 | __u32 d_secpercyl; /* # of data sectors per cylinder */ |
| 499 | __u32 d_secperunit; /* # of data sectors per unit */ |
| 500 | __u16 d_sparespertrack; /* # of spare sectors per track */ |
| 501 | __u16 d_sparespercyl; /* # of spare sectors per cylinder */ |
| 502 | __u32 d_acylinders; /* # of alt. cylinders per unit */ |
| 503 | __u16 d_rpm; /* rotational speed */ |
| 504 | __u16 d_interleave; /* hardware sector interleave */ |
| 505 | __u16 d_trackskew; /* sector 0 skew, per track */ |
| 506 | __u16 d_cylskew; /* sector 0 skew, per cylinder */ |
| 507 | __u32 d_headswitch; /* head switch time, usec */ |
| 508 | __u32 d_trkseek; /* track-to-track seek, usec */ |
| 509 | __u32 d_flags; /* generic flags */ |
| 510 | #define NDDATA 5 |
| 511 | __u32 d_drivedata[NDDATA]; /* drive-type specific information */ |
| 512 | #define NSPARE 5 |
| 513 | __u32 d_spare[NSPARE]; /* reserved for future use */ |
| 514 | __le32 d_magic2; /* the magic number (again) */ |
| 515 | __le16 d_checksum; /* xor of data incl. partitions */ |
| 516 | |
| 517 | /* filesystem and partition information: */ |
| 518 | __le16 d_npartitions; /* number of partitions in following */ |
| 519 | __le32 d_bbsize; /* size of boot area at sn0, bytes */ |
| 520 | __le32 d_sbsize; /* max size of fs superblock, bytes */ |
| 521 | struct bsd_partition { /* the partition table */ |
| 522 | __le32 p_size; /* number of sectors in partition */ |
| 523 | __le32 p_offset; /* starting sector */ |
| 524 | __le32 p_fsize; /* filesystem basic fragment size */ |
| 525 | __u8 p_fstype; /* filesystem type, see below */ |
| 526 | __u8 p_frag; /* filesystem fragments per block */ |
| 527 | __le16 p_cpg; /* filesystem cylinders per group */ |
| 528 | } d_partitions[BSD_MAXPARTITIONS]; /* actually may be more */ |
| 529 | }; |
| 530 | |
| 531 | #endif /* CONFIG_BSD_DISKLABEL */ |
| 532 | |
| 533 | #ifdef CONFIG_UNIXWARE_DISKLABEL |
| 534 | /* |
| 535 | * Unixware slices support by Andrzej Krzysztofowicz <ankry@mif.pg.gda.pl> |
| 536 | * and Krzysztof G. Baranowski <kgb@knm.org.pl> |
| 537 | */ |
| 538 | |
| 539 | #define UNIXWARE_DISKMAGIC (0xCA5E600DUL) /* The disk magic number */ |
| 540 | #define UNIXWARE_DISKMAGIC2 (0x600DDEEEUL) /* The slice table magic nr */ |
| 541 | #define UNIXWARE_NUMSLICE 16 |
| 542 | #define UNIXWARE_FS_UNUSED 0 /* Unused slice entry ID */ |
| 543 | |
| 544 | struct unixware_slice { |
| 545 | __le16 s_label; /* label */ |
| 546 | __le16 s_flags; /* permission flags */ |
| 547 | __le32 start_sect; /* starting sector */ |
| 548 | __le32 nr_sects; /* number of sectors in slice */ |
| 549 | }; |
| 550 | |
| 551 | struct unixware_disklabel { |
| 552 | __le32 d_type; /* drive type */ |
| 553 | __le32 d_magic; /* the magic number */ |
| 554 | __le32 d_version; /* version number */ |
| 555 | char d_serial[12]; /* serial number of the device */ |
| 556 | __le32 d_ncylinders; /* # of data cylinders per device */ |
| 557 | __le32 d_ntracks; /* # of tracks per cylinder */ |
| 558 | __le32 d_nsectors; /* # of data sectors per track */ |
| 559 | __le32 d_secsize; /* # of bytes per sector */ |
| 560 | __le32 d_part_start; /* # of first sector of this partition */ |
| 561 | __le32 d_unknown1[12]; /* ? */ |
| 562 | __le32 d_alt_tbl; /* byte offset of alternate table */ |
| 563 | __le32 d_alt_len; /* byte length of alternate table */ |
| 564 | __le32 d_phys_cyl; /* # of physical cylinders per device */ |
| 565 | __le32 d_phys_trk; /* # of physical tracks per cylinder */ |
| 566 | __le32 d_phys_sec; /* # of physical sectors per track */ |
| 567 | __le32 d_phys_bytes; /* # of physical bytes per sector */ |
| 568 | __le32 d_unknown2; /* ? */ |
| 569 | __le32 d_unknown3; /* ? */ |
| 570 | __le32 d_pad[8]; /* pad */ |
| 571 | |
| 572 | struct unixware_vtoc { |
| 573 | __le32 v_magic; /* the magic number */ |
| 574 | __le32 v_version; /* version number */ |
| 575 | char v_name[8]; /* volume name */ |
| 576 | __le16 v_nslices; /* # of slices */ |
| 577 | __le16 v_unknown1; /* ? */ |
| 578 | __le32 v_reserved[10]; /* reserved */ |
| 579 | struct unixware_slice |
| 580 | v_slice[UNIXWARE_NUMSLICE]; /* slice headers */ |
| 581 | } vtoc; |
| 582 | |
| 583 | }; /* 408 */ |
| 584 | |
| 585 | #endif /* CONFIG_UNIXWARE_DISKLABEL */ |
| 586 | |
| 587 | #ifdef CONFIG_MINIX_SUBPARTITION |
| 588 | # define MINIX_NR_SUBPARTITIONS 4 |
| 589 | #endif /* CONFIG_MINIX_SUBPARTITION */ |
| 590 | |
Fabio Massimo Di Nitto | d18d768 | 2007-02-10 23:50:00 -0800 | [diff] [blame] | 591 | #define ADDPART_FLAG_NONE 0 |
| 592 | #define ADDPART_FLAG_RAID 1 |
| 593 | #define ADDPART_FLAG_WHOLEDISK 2 |
| 594 | |
Tejun Heo | bcce3de | 2008-08-25 19:47:22 +0900 | [diff] [blame] | 595 | extern int blk_alloc_devt(struct hd_struct *part, dev_t *devt); |
| 596 | extern void blk_free_devt(dev_t devt); |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 597 | extern dev_t blk_lookup_devt(const char *name, int partno); |
| 598 | extern char *disk_name (struct gendisk *hd, int partno, char *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Tejun Heo | 540eed5 | 2008-08-25 19:56:15 +0900 | [diff] [blame] | 600 | extern int disk_expand_part_tbl(struct gendisk *disk, int target); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | extern int rescan_partitions(struct gendisk *disk, struct block_device *bdev); |
Jun'ichi Nomura | fe316bf | 2012-03-02 10:38:33 +0100 | [diff] [blame] | 602 | extern int invalidate_partitions(struct gendisk *disk, struct block_device *bdev); |
Tejun Heo | ba32929 | 2008-11-10 15:29:58 +0900 | [diff] [blame] | 603 | extern struct hd_struct * __must_check add_partition(struct gendisk *disk, |
| 604 | int partno, sector_t start, |
Will Drewry | 6d1d805 | 2010-08-31 15:47:05 -0500 | [diff] [blame] | 605 | sector_t len, int flags, |
| 606 | struct partition_meta_info |
| 607 | *info); |
Jens Axboe | 6c23a96 | 2011-01-07 08:43:37 +0100 | [diff] [blame] | 608 | extern void __delete_partition(struct hd_struct *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | extern void delete_partition(struct gendisk *, int); |
Dave Gilbert | dd2a345 | 2007-05-09 02:33:24 -0700 | [diff] [blame] | 610 | extern void printk_all_partitions(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Christoph Lameter | 1946089 | 2005-06-23 00:08:19 -0700 | [diff] [blame] | 612 | extern struct gendisk *alloc_disk_node(int minors, int node_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | extern struct gendisk *alloc_disk(int minors); |
| 614 | extern struct kobject *get_disk(struct gendisk *disk); |
| 615 | extern void put_disk(struct gendisk *disk); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 616 | extern void blk_register_region(dev_t devt, unsigned long range, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | struct module *module, |
| 618 | struct kobject *(*probe)(dev_t, int *, void *), |
| 619 | int (*lock)(dev_t, void *), |
| 620 | void *data); |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 621 | extern void blk_unregister_region(dev_t devt, unsigned long range); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | |
Tejun Heo | e561052 | 2008-08-25 19:56:09 +0900 | [diff] [blame] | 623 | extern ssize_t part_size_show(struct device *dev, |
| 624 | struct device_attribute *attr, char *buf); |
Tejun Heo | 074a7ac | 2008-08-25 19:56:14 +0900 | [diff] [blame] | 625 | extern ssize_t part_stat_show(struct device *dev, |
| 626 | struct device_attribute *attr, char *buf); |
Nikanth Karthikesan | 316d315 | 2009-10-06 20:16:55 +0200 | [diff] [blame] | 627 | extern ssize_t part_inflight_show(struct device *dev, |
| 628 | struct device_attribute *attr, char *buf); |
Tejun Heo | eddb2e2 | 2008-08-25 19:56:13 +0900 | [diff] [blame] | 629 | #ifdef CONFIG_FAIL_MAKE_REQUEST |
| 630 | extern ssize_t part_fail_show(struct device *dev, |
| 631 | struct device_attribute *attr, char *buf); |
| 632 | extern ssize_t part_fail_store(struct device *dev, |
| 633 | struct device_attribute *attr, |
| 634 | const char *buf, size_t count); |
| 635 | #endif /* CONFIG_FAIL_MAKE_REQUEST */ |
Tejun Heo | e561052 | 2008-08-25 19:56:09 +0900 | [diff] [blame] | 636 | |
Jens Axboe | 6c23a96 | 2011-01-07 08:43:37 +0100 | [diff] [blame] | 637 | static inline void hd_ref_init(struct hd_struct *part) |
| 638 | { |
| 639 | atomic_set(&part->ref, 1); |
| 640 | smp_mb(); |
| 641 | } |
| 642 | |
| 643 | static inline void hd_struct_get(struct hd_struct *part) |
| 644 | { |
| 645 | atomic_inc(&part->ref); |
| 646 | smp_mb__after_atomic_inc(); |
| 647 | } |
| 648 | |
| 649 | static inline int hd_struct_try_get(struct hd_struct *part) |
| 650 | { |
| 651 | return atomic_inc_not_zero(&part->ref); |
| 652 | } |
| 653 | |
| 654 | static inline void hd_struct_put(struct hd_struct *part) |
| 655 | { |
| 656 | if (atomic_dec_and_test(&part->ref)) |
| 657 | __delete_partition(part); |
| 658 | } |
| 659 | |
Vivek Goyal | c83f6bf | 2012-08-01 12:24:18 +0200 | [diff] [blame] | 660 | /* |
| 661 | * Any access of part->nr_sects which is not protected by partition |
| 662 | * bd_mutex or gendisk bdev bd_mutex, should be done using this |
| 663 | * accessor function. |
| 664 | * |
| 665 | * Code written along the lines of i_size_read() and i_size_write(). |
| 666 | * CONFIG_PREEMPT case optimizes the case of UP kernel with preemption |
| 667 | * on. |
| 668 | */ |
| 669 | static inline sector_t part_nr_sects_read(struct hd_struct *part) |
| 670 | { |
| 671 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) |
| 672 | sector_t nr_sects; |
| 673 | unsigned seq; |
| 674 | do { |
| 675 | seq = read_seqcount_begin(&part->nr_sects_seq); |
| 676 | nr_sects = part->nr_sects; |
| 677 | } while (read_seqcount_retry(&part->nr_sects_seq, seq)); |
| 678 | return nr_sects; |
| 679 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) |
| 680 | sector_t nr_sects; |
| 681 | |
| 682 | preempt_disable(); |
| 683 | nr_sects = part->nr_sects; |
| 684 | preempt_enable(); |
| 685 | return nr_sects; |
| 686 | #else |
| 687 | return part->nr_sects; |
| 688 | #endif |
| 689 | } |
| 690 | |
| 691 | /* |
| 692 | * Should be called with mutex lock held (typically bd_mutex) of partition |
| 693 | * to provide mutual exlusion among writers otherwise seqcount might be |
| 694 | * left in wrong state leaving the readers spinning infinitely. |
| 695 | */ |
| 696 | static inline void part_nr_sects_write(struct hd_struct *part, sector_t size) |
| 697 | { |
| 698 | #if BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_SMP) |
| 699 | write_seqcount_begin(&part->nr_sects_seq); |
| 700 | part->nr_sects = size; |
| 701 | write_seqcount_end(&part->nr_sects_seq); |
| 702 | #elif BITS_PER_LONG==32 && defined(CONFIG_LBDAF) && defined(CONFIG_PREEMPT) |
| 703 | preempt_disable(); |
| 704 | part->nr_sects = size; |
| 705 | preempt_enable(); |
| 706 | #else |
| 707 | part->nr_sects = size; |
| 708 | #endif |
| 709 | } |
| 710 | |
Jens Axboe | 87c1efb | 2007-05-11 13:29:54 +0200 | [diff] [blame] | 711 | #else /* CONFIG_BLOCK */ |
| 712 | |
| 713 | static inline void printk_all_partitions(void) { } |
| 714 | |
Tejun Heo | cf771cb | 2008-09-03 09:01:09 +0200 | [diff] [blame] | 715 | static inline dev_t blk_lookup_devt(const char *name, int partno) |
Kay Sievers | edfaa7c | 2007-05-21 22:08:01 +0200 | [diff] [blame] | 716 | { |
| 717 | dev_t devt = MKDEV(0, 0); |
| 718 | return devt; |
| 719 | } |
| 720 | |
Jens Axboe | 87c1efb | 2007-05-11 13:29:54 +0200 | [diff] [blame] | 721 | #endif /* CONFIG_BLOCK */ |
David Howells | 9361401 | 2006-09-30 20:45:40 +0200 | [diff] [blame] | 722 | |
David Woodhouse | a8ae50b | 2008-03-12 17:52:56 +0100 | [diff] [blame] | 723 | #endif /* _LINUX_GENHD_H */ |