diff options
| author | NeilBrown <neilb@suse.de> | 2005-11-08 21:39:32 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-09 07:56:38 -0800 |
| commit | bd926c63b7a6843d3ce2728396c0891e54fce5c4 (patch) | |
| tree | 38f7083a733e9b31efe69616c5fa3448c74c1320 /drivers/md/bitmap.c | |
| parent | b2d444d7ad975d555bb919601bcdc0e58975a40e (diff) | |
[PATCH] md: make md on-disk bitmaps not host-endian
Current bitmaps use set_bit et.al and so are host-endian, which means
not-portable. Oops.
Define a new version number (4) for which bitmaps are little-endian.
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/md/bitmap.c')
| -rw-r--r-- | drivers/md/bitmap.c | 22 |
1 files changed, 18 insertions, 4 deletions
diff --git a/drivers/md/bitmap.c b/drivers/md/bitmap.c index c5fa4c2a5af1..220273e81ed6 100644 --- a/drivers/md/bitmap.c +++ b/drivers/md/bitmap.c @@ -482,7 +482,8 @@ static int bitmap_read_sb(struct bitmap *bitmap) /* verify that the bitmap-specific fields are valid */ if (sb->magic != cpu_to_le32(BITMAP_MAGIC)) reason = "bad magic"; - else if (sb->version != cpu_to_le32(BITMAP_MAJOR)) + else if (le32_to_cpu(sb->version) < BITMAP_MAJOR_LO || + le32_to_cpu(sb->version) > BITMAP_MAJOR_HI) reason = "unrecognized superblock version"; else if (chunksize < 512 || chunksize > (1024 * 1024 * 4)) reason = "bitmap chunksize out of range (512B - 4MB)"; @@ -527,6 +528,8 @@ success: bitmap->daemon_lastrun = jiffies; bitmap->max_write_behind = write_behind; bitmap->flags |= 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) bitmap->events_cleared = bitmap->mddev->events; @@ -764,7 +767,10 @@ static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block) /* set the bit */ kaddr = kmap_atomic(page, KM_USER0); - set_bit(bit, kaddr); + if (bitmap->flags & BITMAP_HOSTENDIAN) + set_bit(bit, kaddr); + else + ext2_set_bit(bit, kaddr); kunmap_atomic(kaddr, KM_USER0); PRINTK("set file bit %lu page %lu\n", bit, page->index); @@ -891,6 +897,7 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) oldindex = ~0L; for (i = 0; i < chunks; i++) { + int b; index = file_page_index(i); bit = file_page_offset(i); if (index != oldindex) { /* this is a new page, read it in */ @@ -939,7 +946,11 @@ static int bitmap_init_from_disk(struct bitmap *bitmap, sector_t start) bitmap->filemap[bitmap->file_pages++] = page; } - if (test_bit(bit, page_address(page))) { + if (bitmap->flags & BITMAP_HOSTENDIAN) + b = test_bit(bit, page_address(page)); + else + b = ext2_test_bit(bit, page_address(page)); + if (b) { /* if the disk bit is set, set the memory bit */ bitmap_set_memory_bits(bitmap, i << CHUNK_BLOCK_SHIFT(bitmap), ((i+1) << (CHUNK_BLOCK_SHIFT(bitmap)) >= start) @@ -1097,7 +1108,10 @@ int bitmap_daemon_work(struct bitmap *bitmap) -1); /* clear the bit */ - clear_bit(file_page_offset(j), page_address(page)); + if (bitmap->flags & BITMAP_HOSTENDIAN) + clear_bit(file_page_offset(j), page_address(page)); + else + ext2_clear_bit(file_page_offset(j), page_address(page)); } } spin_unlock_irqrestore(&bitmap->lock, flags); |