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Commit 4f2e639a authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

[PATCH] md: endian annotations for the bitmap superblock 



And a couple of bug fixes found by sparse.

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 1c05b4bc

drivers/md/bitmap.c

+5 −5
Original line number Diff line number Diff line
@@ -536,7 +536,7 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
		printk(KERN_INFO "%s: bitmap file is out of date (%llu < %llu) "

			"-- forcing full recovery\n", bmname(bitmap), events,

			(unsigned long long) bitmap->mddev->events);

		sb->state |= BITMAP_STALE;

		sb->state |= cpu_to_le32(BITMAP_STALE);

	}

success:

	/* assign fields using values from superblock */
@@ -544,11 +544,11 @@ static int bitmap_read_sb(struct bitmap *bitmap) 
	bitmap->daemon_sleep = daemon_sleep;

	bitmap->daemon_lastrun = jiffies;

	bitmap->max_write_behind = write_behind;

	bitmap->flags |= sb->state;

	bitmap->flags |= le32_to_cpu(sb->state);

	if (le32_to_cpu(sb->version) == BITMAP_MAJOR_HOSTENDIAN)

		bitmap->flags |= BITMAP_HOSTENDIAN;

	bitmap->events_cleared = le64_to_cpu(sb->events_cleared);

	if (sb->state & BITMAP_STALE)

	if (sb->state & cpu_to_le32(BITMAP_STALE))

		bitmap->events_cleared = bitmap->mddev->events;

	err = 0;

out:
@@ -578,9 +578,9 @@ static void bitmap_mask_state(struct bitmap *bitmap, enum bitmap_state bits, 
	spin_unlock_irqrestore(&bitmap->lock, flags);

	sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);

	switch (op) {

		case MASK_SET: sb->state |= bits;

		case MASK_SET: sb->state |= cpu_to_le32(bits);

				break;

		case MASK_UNSET: sb->state &= ~bits;

		case MASK_UNSET: sb->state &= cpu_to_le32(~bits);

				break;

		default: BUG();

	}

include/linux/raid/bitmap.h

+10 −10
Original line number Diff line number Diff line
@@ -146,16 +146,16 @@ enum bitmap_state { 


/* the superblock at the front of the bitmap file -- little endian */

typedef struct bitmap_super_s {

	__u32 magic;        /*  0  BITMAP_MAGIC */

	__u32 version;      /*  4  the bitmap major for now, could change... */

	__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 */

	__u64 events;       /* 24  event counter for the bitmap (1)*/

	__u64 events_cleared;/*32  event counter when last bit cleared (2) */

	__u64 sync_size;    /* 40  the size of the md device's sync range(3) */

	__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 */

	__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 */



	__u8  pad[256 - 64]; /* set to zero */

} bitmap_super_t;