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Reorder the flags field in struct btrfs_header and record a flag on writeout

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This allows detection of blocks that have already been written in the
running transaction so they can be recowed instead of modified again.
It is step one in trusting the transid field of the block pointers.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-01 11:21:32 -04:00
parent 2d2ae54797
commit 63b10fc487
3 changed files with 42 additions and 9 deletions
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13
fs/btrfs/disk-io.c
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@@ -159,17 +159,19 @@ static int csum_tree_block(struct btrfs_root *root, struct extent_buffer *buf,
from_this_trans = 1;
/* FIXME, this is not good */
if (from_this_trans == 0 &&
memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
if (memcmp_extent_buffer(buf, result, 0, BTRFS_CRC32_SIZE)) {
u32 val;
u32 found = 0;
memcpy(&found, result, BTRFS_CRC32_SIZE);
read_extent_buffer(buf, &val, 0, BTRFS_CRC32_SIZE);
WARN_ON(1);
printk("btrfs: %s checksum verify failed on %llu "
"wanted %X found %X from_this_trans %d\n",
"wanted %X found %X from_this_trans %d "
"level %d\n",
root->fs_info->sb->s_id,
buf->start, val, found, from_this_trans);
buf->start, val, found, from_this_trans,
btrfs_header_level(buf));
return 1;
}
} else {
@@ -220,6 +222,9 @@ int csum_dirty_buffer(struct btrfs_root *root, struct page *page)
goto err;
}
found_level = btrfs_header_level(eb);
spin_lock(&root->fs_info->hash_lock);
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
spin_unlock(&root->fs_info->hash_lock);
csum_tree_block(root, eb, 0);
err:
free_extent_buffer(eb);