Hello, I've been working hard to get jfs read support in my software, and I try as hard as possible to figure out myself without asking question, but there is a very strange point where I got stuck =( Its a dir inode, which has 10.000 files inside it.
inode nr 12291 and offset 0x600460 presents us the following basic inode information: http://magnifier.sourceforge.net/tmp/jfs_inode_10k_files.png di_fileset $10 di_number $303 di_gen $2A di_size = $14000 di_nblocks = $140 di_nlink = 2 di_uid = 0 di_gid = 0 di_mode = $200041FF di_next_index = $B0100 di_acltype = 0 dtroot_t DASD = zeroes flag = 0x85 = DXD_INDEX | BT_INTERNAL | BT_ROOT nextindex = 1 freecnt: int8 = 7 freelistt: int8 = 2 idotdot = $3040 stbl = 1, 2, 4, 6, 8, 0, 0, 0 dir_table_slot[0] dir_table_slot->rsrvd = 0 dir_table_slot->flag = 1 DIR_INDEX_VALID dir_table_slot->slot = B dir_table_slot->addr1 = 0 dir_table_slot->addr2 = $6023 dir_table_slot[1] dir_table_slot = 0 dir_table_slot->flag = 1 DIR_INDEX_VALID dir_table_slot->slot = 0 dir_table_slot->addr1 = 0 dir_table_slot->addr2 = $6023 dir_table_slot[2] dir_table_slot->rsrvd = $85 dir_table_slot->flag = 1 DIR_INDEX_VALID dir_table_slot->slot = 3 dir_table_slot->addr1 = 0 dir_table_slot->addr2 = 6 dir_table_slot[3] dir_table_slot->rsrvd = 0 dir_table_slot->flag = 1 DIR_INDEX_VALID dir_table_slot->slot = 2 dir_table_slot->addr1 = 0 dir_table_slot->addr2 = $6023 dir_table_slot[4] dir_table_slot->rsrvd = 0 dir_table_slot->flag = 1 DIR_INDEX_VALID dir_table_slot->slot = 3 dir_table_slot->addr1 = 0 dir_table_slot->addr2 = 0 dir_table_slot[5] dir_table_slot->rsrvd = 1 dir_table_slot->flag = 0 DIR_INDEX_FREE dir_table_slot->slot = 0 dir_table_slot->addr1 = 0 dir_table_slot->addr2= $801A etc etc Which has the following problems: 1> If I believe in freecnt 7 items should be free and only 1 valid? Which one? The first with address 0x6023? But in reality 0x6023 contains some files, while 0x801A constains a list of blocks, so it cannot be that only 0x6023 is valid... 2> dir_table_slot[5] with addr 0x801A should be valid, because if it is not, then I don't see how I could possibly have the names of all 10k files, since 0x6023 is filled with only some filenames, while 0x801A has links to many blocks of filenames. But 0x801A has flag=0=DIR_INDEX_FREE, why? 3> dir_table_slot[2] has addr=6 which is obviously wrong, and this block (offset 0x6000) contains only zeroes. But slot[2] is listed in the stbl and even has flag = 1 = DIR_INDEX_VALID How to identify that it is invalid then? 4> 801A is here: http://magnifier.sourceforge.net/tmp/jfs_block_801A.png I assume that the structure is a xtpage_t followed by an array of xad: xtpage_t->next = 0 xtpage_t->prev = 0 xtpage_t->flag = 2=BT_LEAF? xtpage_t->rsrvd1 = 0 xtpage_t->nextindex= $16 xtpage_t->maxentry = $100 xtpage_t->rsrvd2 = 0 Strange here is the flag, I'd expect BT_INTERNAL, but it is BT_LEAF... 801A links to 602A which links to 6083 which finally is a leaf block. But all 3 blocks have flag 2 set .... so how can I differentiate between a leaf (which I think should contain filenames) and an internal node (which I think should contain a list of blocks)? 5> In block 602A there are multiple xad's referring to the exact same leaf blocks (0x6023 for example), the only difference between them being the reserved field: http://magnifier.sourceforge.net/tmp/jfs_block_602A.png xad[2] xad_t->flag = 0 xad_t->rsvrd= $301 xad_t->off1 = 0 xad_t->off2= $6023 xad_t->len = $60100 xad_t->addr1 = 0 xad_t->addr2 = $6023 xad[3] xad_t->flag = 0 xad_t->rsvrd = $501 xad_t->off1 = 0 xad_t->off2= $6023 xad_t->len = $60100 xad_t->addr1 = 0 xad_t->addr2 = $6023 Is this information relevant for my software or should I just skip repeated blocks? thanks =) -- Felipe Monteiro de Carvalho ------------------------------------------------------------------------------ BPM Camp - Free Virtual Workshop May 6th at 10am PDT/1PM EDT Develop your own process in accordance with the BPMN 2 standard Learn Process modeling best practices with Bonita BPM through live exercises http://www.bonitasoft.com/be-part-of-it/events/bpm-camp-virtual- event?utm_ source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF _______________________________________________ Jfs-discussion mailing list Jfs-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jfs-discussion
