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An extent's logical offset and address are represented as a 40-bit value split into two parts: the most significant 8 bits and the least significant 32 bits. Currently the JFS code uses only the least significant 32 bits value for offsets and addresses assuming the data size will never exceed the 32-bit range. This approach ignores the most significant 8 bits potentially leading to incorrect offsets and addresses for larger values. The patch fixes it by incorporating the most significant 8 bits into the calculation to get the full 40-bits value for offsets and addresses. https://jfs.sourceforge.net/project/pub/jfslayout.pdf "off1,off2 is a 40-bit field, containing the logical offset of the first block in the extent. ... addr1,addr2 is a 40-bit field, containing the address of the extent." Signed-off-by: Lidong Chen <lidong.chen@oracle.com> Reviewed-by: Alec Brown <alec.r.brown@oracle.com> Reviewed-by: Ross Philipson <ross.philipson@oracle.com> Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. See the file MAINTAINERS for information about the GRUB maintainers, etc. If you found a security vulnerability in the GRUB please check the SECURITY file to get more information how to properly report this kind of bugs to the maintainers. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'