Hello folks,
Referring to the document "XFS File System Structure" by Silicon Graphics ,page number 34 ....
"* On disk, the B+tree node starts with the xfs_bmbr_block_t header followed by an array of
xfs_bmbt_key_t values and then an array of xfs_bmbt_ptr_t values.The size of
both arrays is specified by the header's bb_numrecs value ."
"* The root node in the inode can only contain up to 19 key/pointer pairs for a standard 256 byte inode
before a new level of nodes is added between the root and the leaves."
My query is,
I do not see the header xfs_bmbr_block_t anywhere else in the documentation.Is it a
spelling a mistake? As far as I understand, bb_numrecs represents the number of pointers present in
the Inode core and not the size of the key/pointer arrays.This pointer value helps us reach the
block of extents having the signature BMAP. Please correct me if I am wrong.
If there are up to 19 key/pointer pairs for a standard 256 byte Inode, do any one know how
may key/pointer pair does a Inode core of size 512 and 1024 will have????
Is there any way to calculate the offset of the pointer ??
Pleas help me
