On 02/21/2015 04:26 AM, Felipe Monteiro de Carvalho wrote: > Hello, > > I am writing a software to read jfs partitions, and I can already read > the root and many directories / files inside it. > > But some dirs / files have a high inode number (0x106 and 0x107), but > my Fileset Inode Map has only 3 extents, which means that I have only > 32*3 inodes available, so I cannot locate this high inode nr =( > > Any ideas of what I am failing to understand here??? How to find inode > with number 0x106?
Are you familiar with the JFS layout document? http://jfs.sourceforge.net/project/pub/jfslayout.pdf The fileset inode map consists of an array of inode aggregate group structures or IAGs. These contain maps to the inode extents that actually hold the inodes themselves. Each IAG addresses 4096 inodes (INOSPERIAG), so inodes 0x106 and 0x107 need only the first IAG. Within the IAG is an array of the pxd's pointing to the extents, inoext[], so inodes 0x106 and 0x107 would be in the extent pointed to by inoext[8] in the first IAG. The jfsdebugfs tool may be helpful in looking at the structures within your filesystem. The source code to that, in the xpeek directory of jfsutils, would be another reference for navigating the data structures. > Here is the screenshot of the root inode: > > http://magnifier.sourceforge.net/tmp/jfs_strange_inode_nr.png > > Note the selected area: > > 06010000 FF 07 <item name> > > I interpreted this as being: > > struct ldtentry { > __le32 inumber;-> $106 > s8 next; -> FF > u8 namlen; -> 07 > ... > > And therefore inode nr 0x106 but like I said, my Fileset Inode > Allocation Map has only 3 extents in iag.inoext each with len=4 which > is not enough to find the said inode. > > I thought that maybe there are multiple Fileset Inode Allocation Maps, > but look at my Fileset Inode: > > http://magnifier.sourceforge.net/tmp/jfs_fileset_inode.png > > At position 0x100 from the start of the Fileset Inode I interpreted as > the xad, with len=2 therefore there is only space for 1 Fileset Inode > Allocation Map. > > Please, any help is greatly appreciated =) > > thanks, > ------------------------------------------------------------------------------ Download BIRT iHub F-Type - The Free Enterprise-Grade BIRT Server from Actuate! Instantly Supercharge Your Business Reports and Dashboards with Interactivity, Sharing, Native Excel Exports, App Integration & more Get technology previously reserved for billion-dollar corporations, FREE http://pubads.g.doubleclick.net/gampad/clk?id=190641631&iu=/4140/ostg.clktrk _______________________________________________ Jfs-discussion mailing list Jfs-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jfs-discussion
