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Diffstat (limited to 'drivers/md/bitmap.h')
| -rw-r--r-- | drivers/md/bitmap.h | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/drivers/md/bitmap.h b/drivers/md/bitmap.h new file mode 100644 index 000000000..f1f4dd010 --- /dev/null +++ b/drivers/md/bitmap.h @@ -0,0 +1,269 @@ +/* + * bitmap.h: Copyright (C) Peter T. Breuer (ptb@ot.uc3m.es) 2003 + * + * additions: Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. + */ +#ifndef BITMAP_H +#define BITMAP_H 1 + +#define BITMAP_MAJOR_LO 3 +/* version 4 insists the bitmap is in little-endian order + * with version 3, it is host-endian which is non-portable + */ +#define BITMAP_MAJOR_HI 4 +#define BITMAP_MAJOR_HOSTENDIAN 3 + +/* + * in-memory bitmap: + * + * Use 16 bit block counters to track pending writes to each "chunk". + * The 2 high order bits are special-purpose, the first is a flag indicating + * whether a resync is needed. The second is a flag indicating whether a + * resync is active. + * This means that the counter is actually 14 bits: + * + * +--------+--------+------------------------------------------------+ + * | resync | resync | counter | + * | needed | active | | + * | (0-1) | (0-1) | (0-16383) | + * +--------+--------+------------------------------------------------+ + * + * The "resync needed" bit is set when: + * a '1' bit is read from storage at startup. + * a write request fails on some drives + * a resync is aborted on a chunk with 'resync active' set + * It is cleared (and resync-active set) when a resync starts across all drives + * of the chunk. + * + * + * The "resync active" bit is set when: + * a resync is started on all drives, and resync_needed is set. + * resync_needed will be cleared (as long as resync_active wasn't already set). + * It is cleared when a resync completes. + * + * The counter counts pending write requests, plus the on-disk bit. + * When the counter is '1' and the resync bits are clear, the on-disk + * bit can be cleared as well, thus setting the counter to 0. + * When we set a bit, or in the counter (to start a write), if the fields is + * 0, we first set the disk bit and set the counter to 1. + * + * If the counter is 0, the on-disk bit is clear and the stipe is clean + * Anything that dirties the stipe pushes the counter to 2 (at least) + * and sets the on-disk bit (lazily). + * If a periodic sweep find the counter at 2, it is decremented to 1. + * If the sweep find the counter at 1, the on-disk bit is cleared and the + * counter goes to zero. + * + * Also, we'll hijack the "map" pointer itself and use it as two 16 bit block + * counters as a fallback when "page" memory cannot be allocated: + * + * Normal case (page memory allocated): + * + * page pointer (32-bit) + * + * [ ] ------+ + * | + * +-------> [ ][ ]..[ ] (4096 byte page == 2048 counters) + * c1 c2 c2048 + * + * Hijacked case (page memory allocation failed): + * + * hijacked page pointer (32-bit) + * + * [ ][ ] (no page memory allocated) + * counter #1 (16-bit) counter #2 (16-bit) + * + */ + +#ifdef __KERNEL__ + +#define PAGE_BITS (PAGE_SIZE << 3) +#define PAGE_BIT_SHIFT (PAGE_SHIFT + 3) + +typedef __u16 bitmap_counter_t; +#define COUNTER_BITS 16 +#define COUNTER_BIT_SHIFT 4 +#define COUNTER_BYTE_SHIFT (COUNTER_BIT_SHIFT - 3) + +#define NEEDED_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 1))) +#define RESYNC_MASK ((bitmap_counter_t) (1 << (COUNTER_BITS - 2))) +#define COUNTER_MAX ((bitmap_counter_t) RESYNC_MASK - 1) +#define NEEDED(x) (((bitmap_counter_t) x) & NEEDED_MASK) +#define RESYNC(x) (((bitmap_counter_t) x) & RESYNC_MASK) +#define COUNTER(x) (((bitmap_counter_t) x) & COUNTER_MAX) + +/* how many counters per page? */ +#define PAGE_COUNTER_RATIO (PAGE_BITS / COUNTER_BITS) +/* same, except a shift value for more efficient bitops */ +#define PAGE_COUNTER_SHIFT (PAGE_BIT_SHIFT - COUNTER_BIT_SHIFT) +/* same, except a mask value for more efficient bitops */ +#define PAGE_COUNTER_MASK (PAGE_COUNTER_RATIO - 1) + +#define BITMAP_BLOCK_SHIFT 9 + +#endif + +/* + * bitmap structures: + */ + +#define BITMAP_MAGIC 0x6d746962 + +/* use these for bitmap->flags and bitmap->sb->state bit-fields */ +enum bitmap_state { + BITMAP_STALE = 1, /* the bitmap file is out of date or had -EIO */ + BITMAP_WRITE_ERROR = 2, /* A write error has occurred */ + BITMAP_HOSTENDIAN =15, +}; + +/* the superblock at the front of the bitmap file -- little endian */ +typedef struct bitmap_super_s { + __le32 magic; /* 0 BITMAP_MAGIC */ + __le32 version; /* 4 the bitmap major for now, could change... */ + __u8 uuid[16]; /* 8 128 bit uuid - must match md device uuid */ + __le64 events; /* 24 event counter for the bitmap (1)*/ + __le64 events_cleared;/*32 event counter when last bit cleared (2) */ + __le64 sync_size; /* 40 the size of the md device's sync range(3) */ + __le32 state; /* 48 bitmap state information */ + __le32 chunksize; /* 52 the bitmap chunk size in bytes */ + __le32 daemon_sleep; /* 56 seconds between disk flushes */ + __le32 write_behind; /* 60 number of outstanding write-behind writes */ + __le32 sectors_reserved; /* 64 number of 512-byte sectors that are + * reserved for the bitmap. */ + __le32 nodes; /* 68 the maximum number of nodes in cluster. */ + __u8 cluster_name[64]; /* 72 cluster name to which this md belongs */ + __u8 pad[256 - 136]; /* set to zero */ +} bitmap_super_t; + +/* notes: + * (1) This event counter is updated before the eventcounter in the md superblock + * When a bitmap is loaded, it is only accepted if this event counter is equal + * to, or one greater than, the event counter in the superblock. + * (2) This event counter is updated when the other one is *if*and*only*if* the + * array is not degraded. As bits are not cleared when the array is degraded, + * this represents the last time that any bits were cleared. + * If a device is being added that has an event count with this value or + * higher, it is accepted as conforming to the bitmap. + * (3)This is the number of sectors represented by the bitmap, and is the range that + * resync happens across. For raid1 and raid5/6 it is the size of individual + * devices. For raid10 it is the size of the array. + */ + +#ifdef __KERNEL__ + +/* the in-memory bitmap is represented by bitmap_pages */ +struct bitmap_page { + /* + * map points to the actual memory page + */ + char *map; + /* + * in emergencies (when map cannot be alloced), hijack the map + * pointer and use it as two counters itself + */ + unsigned int hijacked:1; + /* + * If any counter in this page is '1' or '2' - and so could be + * cleared then that page is marked as 'pending' + */ + unsigned int pending:1; + /* + * count of dirty bits on the page + */ + unsigned int count:30; +}; + +/* the main bitmap structure - one per mddev */ +struct bitmap { + + struct bitmap_counts { + spinlock_t lock; + struct bitmap_page *bp; + unsigned long pages; /* total number of pages + * in the bitmap */ + unsigned long missing_pages; /* number of pages + * not yet allocated */ + unsigned long chunkshift; /* chunksize = 2^chunkshift + * (for bitops) */ + unsigned long chunks; /* Total number of data + * chunks for the array */ + } counts; + + struct mddev *mddev; /* the md device that the bitmap is for */ + + __u64 events_cleared; + int need_sync; + + struct bitmap_storage { + struct file *file; /* backing disk file */ + struct page *sb_page; /* cached copy of the bitmap + * file superblock */ + struct page **filemap; /* list of cache pages for + * the file */ + unsigned long *filemap_attr; /* attributes associated + * w/ filemap pages */ + unsigned long file_pages; /* number of pages in the file*/ + unsigned long bytes; /* total bytes in the bitmap */ + } storage; + + unsigned long flags; + + int allclean; + + atomic_t behind_writes; + unsigned long behind_writes_used; /* highest actual value at runtime */ + + /* + * the bitmap daemon - periodically wakes up and sweeps the bitmap + * file, cleaning up bits and flushing out pages to disk as necessary + */ + unsigned long daemon_lastrun; /* jiffies of last run */ + unsigned long last_end_sync; /* when we lasted called end_sync to + * update bitmap with resync progress */ + + atomic_t pending_writes; /* pending writes to the bitmap file */ + wait_queue_head_t write_wait; + wait_queue_head_t overflow_wait; + wait_queue_head_t behind_wait; + + struct kernfs_node *sysfs_can_clear; + int cluster_slot; /* Slot offset for clustered env */ +}; + +/* the bitmap API */ + +/* these are used only by md/bitmap */ +struct bitmap *bitmap_create(struct mddev *mddev, int slot); +int bitmap_load(struct mddev *mddev); +void bitmap_flush(struct mddev *mddev); +void bitmap_destroy(struct mddev *mddev); + +void bitmap_print_sb(struct bitmap *bitmap); +void bitmap_update_sb(struct bitmap *bitmap); +void bitmap_status(struct seq_file *seq, struct bitmap *bitmap); + +int bitmap_setallbits(struct bitmap *bitmap); +void bitmap_write_all(struct bitmap *bitmap); + +void bitmap_dirty_bits(struct bitmap *bitmap, unsigned long s, unsigned long e); + +/* these are exported */ +int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, + unsigned long sectors, int behind); +void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, + unsigned long sectors, int success, int behind); +int bitmap_start_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int degraded); +void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, sector_t *blocks, int aborted); +void bitmap_close_sync(struct bitmap *bitmap); +void bitmap_cond_end_sync(struct bitmap *bitmap, sector_t sector); + +void bitmap_unplug(struct bitmap *bitmap); +void bitmap_daemon_work(struct mddev *mddev); + +int bitmap_resize(struct bitmap *bitmap, sector_t blocks, + int chunksize, int init); +int bitmap_copy_from_slot(struct mddev *mddev, int slot, + sector_t *lo, sector_t *hi, bool clear_bits); +#endif + +#endif |