Actually L1 table entry offset is in 512 bytes sectors. Fix the spec. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> --- docs/interop/parallels.txt | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/docs/interop/parallels.txt b/docs/interop/parallels.txt index f15bf35bd1..ebbdd1b25b 100644 --- a/docs/interop/parallels.txt +++ b/docs/interop/parallels.txt @@ -209,15 +209,14 @@ of its data area are: The number of entries in the L1 table of the bitmap. variable: l1_table (8 * l1_size bytes) - L1 offset table (in bytes) A dirty bitmap is stored using a one-level structure for the mapping to host -clusters - an L1 table. +clusters - an L1 table. Each L1 table entry is a 64bit integer described +below: -Given an offset in bytes into the bitmap data, the offset in bytes into the -image file can be obtained as follows: +Given an offset in bytes into the bitmap data, corresponding L1 entry is - offset = l1_table[offset / cluster_size] + (offset % cluster_size) + l1_table[offset / cluster_size] If an L1 table entry is 0, the corresponding cluster of the bitmap is assumed to be zero. @@ -225,4 +224,8 @@ to be zero. If an L1 table entry is 1, the corresponding cluster of the bitmap is assumed to have all bits set. -If an L1 table entry is not 0 or 1, it allocates a cluster from the data area. +If an L1 table entry is not 0 or 1, it contains corresponding cluster offset +(in 512b sectors). Given an offset in bytes into the bitmap data the offset in +bytes into the image file can be obtained as follows: + + offset = l1_table[offset / cluster_size] * 512 + (offset % cluster_size) -- 2.29.2