On 4/24/14, 5:09 PM, Felipe Monteiro de Carvalho wrote: > Hello, > > I am writing an application which reads XFS partitions, so I am trying > to understand the internal working of XFS. I read the documentation > here: http://www.dubeyko.com/development/FileSystems/XFS/xfs_filesystem_structure.pdf > > But I am stuck at a particular point. To get to the inodes I see that > I should first read xfs_agi_t, no problem here, then its root field > points to a block which contains xfs_inobt_block_t + a sequence of > xfs_inobt_rec_t records and those records are supposed to show me > where the inodes are, but there is no field in xfs_inobt_rec_t such as > a block number =( Any idea how to get then the physical position in > the disk where the inodes are from xfs_inobt_block_t + a sequence of > xfs_inobt_rec_t? The inode's location is encoded in its inode number. See for example: /* * Inode number format: * low inopblog bits - offset in block * next agblklog bits - block number in ag * next agno_log bits - ag number * high agno_log-agblklog-inopblog bits - 0 */ #define XFS_INO_TO_FSB(mp,i) \ XFS_AGB_TO_FSB(mp, XFS_INO_TO_AGNO(mp,i), XFS_INO_TO_AGBNO(mp,i)) -Eric > thanks, > _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
