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authorChris Mason <chris.mason@oracle.com>2008-12-08 16:58:54 -0500
committerChris Mason <chris.mason@oracle.com>2008-12-08 16:58:54 -0500
commitd20f7043fa65659136c1a7c3c456eeeb5c6f431f (patch)
tree05d1031cadec6d440a97221e3a32adb504a51699 /fs/btrfs/ordered-data.h
parentc99e905c945c462085c6d64646dc5af0c0a16815 (diff)
Btrfs: move data checksumming into a dedicated tree
Btrfs stores checksums for each data block. Until now, they have been stored in the subvolume trees, indexed by the inode that is referencing the data block. This means that when we read the inode, we've probably read in at least some checksums as well. But, this has a few problems: * The checksums are indexed by logical offset in the file. When compression is on, this means we have to do the expensive checksumming on the uncompressed data. It would be faster if we could checksum the compressed data instead. * If we implement encryption, we'll be checksumming the plain text and storing that on disk. This is significantly less secure. * For either compression or encryption, we have to get the plain text back before we can verify the checksum as correct. This makes the raid layer balancing and extent moving much more expensive. * It makes the front end caching code more complex, as we have touch the subvolume and inodes as we cache extents. * There is potentitally one copy of the checksum in each subvolume referencing an extent. The solution used here is to store the extent checksums in a dedicated tree. This allows us to index the checksums by phyiscal extent start and length. It means: * The checksum is against the data stored on disk, after any compression or encryption is done. * The checksum is stored in a central location, and can be verified without following back references, or reading inodes. This makes compression significantly faster by reducing the amount of data that needs to be checksummed. It will also allow much faster raid management code in general. The checksums are indexed by a key with a fixed objectid (a magic value in ctree.h) and offset set to the starting byte of the extent. This allows us to copy the checksum items into the fsync log tree directly (or any other tree), without having to invent a second format for them. Signed-off-by: Chris Mason <chris.mason@oracle.com>
Diffstat (limited to 'fs/btrfs/ordered-data.h')
-rw-r--r--fs/btrfs/ordered-data.h10
1 files changed, 6 insertions, 4 deletions
diff --git a/fs/btrfs/ordered-data.h b/fs/btrfs/ordered-data.h
index 260bf95dfe0..ab66d5e8d6d 100644
--- a/fs/btrfs/ordered-data.h
+++ b/fs/btrfs/ordered-data.h
@@ -33,15 +33,17 @@ struct btrfs_ordered_inode_tree {
* the ordered extent are on disk
*/
struct btrfs_sector_sum {
- u64 offset;
+ /* bytenr on disk */
+ u64 bytenr;
u32 sum;
};
struct btrfs_ordered_sum {
- u64 file_offset;
+ /* bytenr is the start of this extent on disk */
+ u64 bytenr;
+
/*
* this is the length in bytes covered by the sums array below.
- * But, the sums array may not be contiguous in the file.
*/
unsigned long len;
struct list_head list;
@@ -147,7 +149,7 @@ struct btrfs_ordered_extent *
btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
int btrfs_ordered_update_i_size(struct inode *inode,
struct btrfs_ordered_extent *ordered);
-int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u32 *sum);
+int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
int btrfs_wait_on_page_writeback_range(struct address_space *mapping,
pgoff_t start, pgoff_t end);
int btrfs_fdatawrite_range(struct address_space *mapping, loff_t start,