#ifndef BITMAP_H
#define BITMAP_H 1
-#define BITMAP_MAJOR 3
-#define BITMAP_MINOR 38
+#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
+
+#define BITMAP_MINOR 39
/*
* in-memory bitmap:
/* use these for bitmap->flags and bitmap->sb->state bit-fields */
enum bitmap_state {
BITMAP_ACTIVE = 0x001, /* the bitmap is in use */
- BITMAP_STALE = 0x002 /* the bitmap file is out of date or had -EIO */
+ BITMAP_STALE = 0x002, /* the bitmap file is out of date or had -EIO */
+ BITMAP_WRITE_ERROR = 0x004, /* A write error has occurred */
+ BITMAP_HOSTENDIAN = 0x8000,
};
/* the superblock at the front of the bitmap file -- little endian */
__u32 state; /* 48 bitmap state information */
__u32 chunksize; /* 52 the bitmap chunk size in bytes */
__u32 daemon_sleep; /* 56 seconds between disk flushes */
+ __u32 write_behind; /* 60 number of outstanding write-behind writes */
- __u8 pad[256 - 60]; /* set to zero */
+ __u8 pad[256 - 64]; /* set to zero */
} bitmap_super_t;
/* notes:
unsigned long flags;
+ unsigned long max_write_behind; /* write-behind mode */
+ atomic_t behind_writes;
+
/*
* 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 daemon_sleep; /* how many seconds between updates? */
- /*
- * bitmap_writeback_daemon waits for file-pages that have been written,
- * as there is no way to get a call-back when a page write completes.
- */
- mdk_thread_t *writeback_daemon;
- spinlock_t write_lock;
+ atomic_t pending_writes; /* pending writes to the bitmap file */
wait_queue_head_t write_wait;
- struct list_head complete_pages;
- mempool_t *write_pool;
+
};
/* the bitmap API */
void bitmap_write_all(struct bitmap *bitmap);
/* these are exported */
-int bitmap_startwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors);
-void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long sectors,
- int success);
+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, int *blocks, int degraded);
void bitmap_end_sync(struct bitmap *bitmap, sector_t offset, int *blocks, int aborted);
void bitmap_close_sync(struct bitmap *bitmap);