btrfs-progs: Sync the comment for btrfs_file_extent_item

The comment about data checksum on disk_bytes is completely wrong.  Sync
it with fixed kernel comment to avoid confusion.

Reviewed-by: Su Yue <Damenly_Su@gmx.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
master
Qu Wenruo 2019-12-17 14:52:40 +08:00 committed by David Sterba
parent 012e51ae6e
commit dca55d6450
1 changed files with 8 additions and 4 deletions

12
ctree.h
View File

@ -916,13 +916,16 @@ struct btrfs_file_extent_item {
u8 type;
/*
* disk space consumed by the extent, checksum blocks are included
* in these numbers
* Disk space consumed by the data extent
* Data checksum is stored in csum tree, thus no bytenr/length takes
* csum into consideration.
*
* The inline extent data starts at this offset in the structure.
*/
__le64 disk_bytenr;
__le64 disk_num_bytes;
/*
* the logical offset in file blocks (no csums)
* The logical offset in file blocks.
* this extent record is for. This allows a file extent to point
* into the middle of an existing extent on disk, sharing it
* between two snapshots (useful if some bytes in the middle of the
@ -930,7 +933,8 @@ struct btrfs_file_extent_item {
*/
__le64 offset;
/*
* the logical number of file blocks (no csums included)
* The logical number of file blocks. This always reflects the size
* uncompressed and without encoding.
*/
__le64 num_bytes;