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Diffstat (limited to 'include/linux/raid/md_k.h')
| -rw-r--r-- | include/linux/raid/md_k.h | 341 |
1 files changed, 341 insertions, 0 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h new file mode 100644 index 000000000..d00563357 --- /dev/null +++ b/include/linux/raid/md_k.h @@ -0,0 +1,341 @@ +/* + md_k.h : kernel internal structure of the Linux MD driver + Copyright (C) 1996-98 Ingo Molnar, Gadi Oxman + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2, or (at your option) + any later version. + + You should have received a copy of the GNU General Public License + (for example /usr/src/linux/COPYING); if not, write to the Free + Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#ifndef _MD_K_H +#define _MD_K_H + +#define MD_RESERVED 0UL +#define LINEAR 1UL +#define STRIPED 2UL +#define RAID0 STRIPED +#define RAID1 3UL +#define RAID5 4UL +#define TRANSLUCENT 5UL +#define HSM 6UL +#define MAX_PERSONALITY 7UL + +extern inline int pers_to_level (int pers) +{ + switch (pers) { + case HSM: return -3; + case TRANSLUCENT: return -2; + case LINEAR: return -1; + case RAID0: return 0; + case RAID1: return 1; + case RAID5: return 5; + } + panic("pers_to_level()"); +} + +extern inline int level_to_pers (int level) +{ + switch (level) { + case -3: return HSM; + case -2: return TRANSLUCENT; + case -1: return LINEAR; + case 0: return RAID0; + case 1: return RAID1; + case 4: + case 5: return RAID5; + } + return MD_RESERVED; +} + +typedef struct mddev_s mddev_t; +typedef struct mdk_rdev_s mdk_rdev_t; + +#if (MINORBITS != 8) +#error MD doesnt handle bigger kdev yet +#endif + +#define MAX_REAL 12 /* Max number of disks per md dev */ +#define MAX_MD_DEVS (1<<MINORBITS) /* Max number of md dev */ + +/* + * Maps a kdev to an mddev/subdev. How 'data' is handled is up to + * the personality. (eg. HSM uses this to identify individual LVs) + */ +typedef struct dev_mapping_s { + mddev_t *mddev; + void *data; +} dev_mapping_t; + +extern dev_mapping_t mddev_map [MAX_MD_DEVS]; + +extern inline mddev_t * kdev_to_mddev (kdev_t dev) +{ + return mddev_map[MINOR(dev)].mddev; +} + +/* + * options passed in raidrun: + */ + +#define MAX_CHUNK_SIZE (4096*1024) + +/* + * default readahead + */ +#define MD_READAHEAD (256 * 512) + +extern inline int disk_faulty(mdp_disk_t * d) +{ + return d->state & (1 << MD_DISK_FAULTY); +} + +extern inline int disk_active(mdp_disk_t * d) +{ + return d->state & (1 << MD_DISK_ACTIVE); +} + +extern inline int disk_sync(mdp_disk_t * d) +{ + return d->state & (1 << MD_DISK_SYNC); +} + +extern inline int disk_spare(mdp_disk_t * d) +{ + return !disk_sync(d) && !disk_active(d) && !disk_faulty(d); +} + +extern inline int disk_removed(mdp_disk_t * d) +{ + return d->state & (1 << MD_DISK_REMOVED); +} + +extern inline void mark_disk_faulty(mdp_disk_t * d) +{ + d->state |= (1 << MD_DISK_FAULTY); +} + +extern inline void mark_disk_active(mdp_disk_t * d) +{ + d->state |= (1 << MD_DISK_ACTIVE); +} + +extern inline void mark_disk_sync(mdp_disk_t * d) +{ + d->state |= (1 << MD_DISK_SYNC); +} + +extern inline void mark_disk_spare(mdp_disk_t * d) +{ + d->state = 0; +} + +extern inline void mark_disk_removed(mdp_disk_t * d) +{ + d->state = (1 << MD_DISK_FAULTY) | (1 << MD_DISK_REMOVED); +} + +extern inline void mark_disk_inactive(mdp_disk_t * d) +{ + d->state &= ~(1 << MD_DISK_ACTIVE); +} + +extern inline void mark_disk_nonsync(mdp_disk_t * d) +{ + d->state &= ~(1 << MD_DISK_SYNC); +} + +/* + * MD's 'extended' device + */ +struct mdk_rdev_s +{ + struct md_list_head same_set; /* RAID devices within the same set */ + struct md_list_head all; /* all RAID devices */ + struct md_list_head pending; /* undetected RAID devices */ + + kdev_t dev; /* Device number */ + kdev_t old_dev; /* "" when it was last imported */ + int size; /* Device size (in blocks) */ + mddev_t *mddev; /* RAID array if running */ + unsigned long last_events; /* IO event timestamp */ + + struct inode *inode; /* Lock inode */ + struct file filp; /* Lock file */ + + mdp_super_t *sb; + int sb_offset; + + int faulty; /* if faulty do not issue IO requests */ + int desc_nr; /* descriptor index in the superblock */ +}; + + +/* + * disk operations in a working array: + */ +#define DISKOP_SPARE_INACTIVE 0 +#define DISKOP_SPARE_WRITE 1 +#define DISKOP_SPARE_ACTIVE 2 +#define DISKOP_HOT_REMOVE_DISK 3 +#define DISKOP_HOT_ADD_DISK 4 + +typedef struct mdk_personality_s mdk_personality_t; + +struct mddev_s +{ + void *private; + mdk_personality_t *pers; + int __minor; + mdp_super_t *sb; + int nb_dev; + struct md_list_head disks; + int sb_dirty; + mdu_param_t param; + int ro; + unsigned int curr_resync; + unsigned long resync_start; + char *name; + int recovery_running; + struct semaphore reconfig_sem; + struct semaphore recovery_sem; + struct semaphore resync_sem; + struct md_list_head all_mddevs; + request_queue_t queue; +}; + +struct mdk_personality_s +{ + char *name; + int (*map)(mddev_t *mddev, kdev_t dev, kdev_t *rdev, + unsigned long *rsector, unsigned long size); + int (*make_request)(mddev_t *mddev, int rw, struct buffer_head * bh); + void (*end_request)(struct buffer_head * bh, int uptodate); + int (*run)(mddev_t *mddev); + int (*stop)(mddev_t *mddev); + int (*status)(char *page, mddev_t *mddev); + int (*ioctl)(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg); + int max_invalid_dev; + int (*error_handler)(mddev_t *mddev, kdev_t dev); + +/* + * Some personalities (RAID-1, RAID-5) can have disks hot-added and + * hot-removed. Hot removal is different from failure. (failure marks + * a disk inactive, but the disk is still part of the array) The interface + * to such operations is the 'pers->diskop()' function, can be NULL. + * + * the diskop function can change the pointer pointing to the incoming + * descriptor, but must do so very carefully. (currently only + * SPARE_ACTIVE expects such a change) + */ + int (*diskop) (mddev_t *mddev, mdp_disk_t **descriptor, int state); + + int (*stop_resync)(mddev_t *mddev); + int (*restart_resync)(mddev_t *mddev); +}; + + +/* + * Currently we index md_array directly, based on the minor + * number. This will have to change to dynamic allocation + * once we start supporting partitioning of md devices. + */ +extern inline int mdidx (mddev_t * mddev) +{ + return mddev->__minor; +} + +extern inline kdev_t mddev_to_kdev(mddev_t * mddev) +{ + return MKDEV(MD_MAJOR, mdidx(mddev)); +} + +extern mdk_rdev_t * find_rdev(mddev_t * mddev, kdev_t dev); +extern mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr); + +/* + * iterates through some rdev ringlist. It's safe to remove the + * current 'rdev'. Dont touch 'tmp' though. + */ +#define ITERATE_RDEV_GENERIC(head,field,rdev,tmp) \ + \ + for (tmp = head.next; \ + rdev = md_list_entry(tmp, mdk_rdev_t, field), \ + tmp = tmp->next, tmp->prev != &head \ + ; ) +/* + * iterates through the 'same array disks' ringlist + */ +#define ITERATE_RDEV(mddev,rdev,tmp) \ + ITERATE_RDEV_GENERIC((mddev)->disks,same_set,rdev,tmp) + +/* + * Same as above, but assumes that the device has rdev->desc_nr numbered + * from 0 to mddev->nb_dev, and iterates through rdevs in ascending order. + */ +#define ITERATE_RDEV_ORDERED(mddev,rdev,i) \ + for (i = 0; rdev = find_rdev_nr(mddev, i), i < mddev->nb_dev; i++) + + +/* + * Iterates through all 'RAID managed disks' + */ +#define ITERATE_RDEV_ALL(rdev,tmp) \ + ITERATE_RDEV_GENERIC(all_raid_disks,all,rdev,tmp) + +/* + * Iterates through 'pending RAID disks' + */ +#define ITERATE_RDEV_PENDING(rdev,tmp) \ + ITERATE_RDEV_GENERIC(pending_raid_disks,pending,rdev,tmp) + +/* + * iterates through all used mddevs in the system. + */ +#define ITERATE_MDDEV(mddev,tmp) \ + \ + for (tmp = all_mddevs.next; \ + mddev = md_list_entry(tmp, mddev_t, all_mddevs), \ + tmp = tmp->next, tmp->prev != &all_mddevs \ + ; ) + +extern inline int lock_mddev (mddev_t * mddev) +{ + return down_interruptible(&mddev->reconfig_sem); +} + +extern inline void unlock_mddev (mddev_t * mddev) +{ + up(&mddev->reconfig_sem); +} + +#define xchg_values(x,y) do { __typeof__(x) __tmp = x; \ + x = y; y = __tmp; } while (0) + +typedef struct mdk_thread_s { + void (*run) (void *data); + void *data; + md_wait_queue_head_t wqueue; + unsigned long flags; + struct semaphore *sem; + struct task_struct *tsk; + const char *name; +} mdk_thread_t; + +#define THREAD_WAKEUP 0 + +#define MAX_DISKNAME_LEN 32 + +typedef struct dev_name_s { + struct md_list_head list; + kdev_t dev; + char name [MAX_DISKNAME_LEN]; +} dev_name_t; + +#endif _MD_K_H + |