Mounting of HFS CD-ROM broke between 2.4.9 and 2.4.10

Romain Dolbeau (dolbeau@irisa.fr)
Thu, 18 Oct 2001 11:25:09 +0200


Hello,

HFS (Hierarchical File Sytem, from Apple) formatted CD-ROM used
to mount fine until 2.4.9, and file on them were accessible.
They won't mount anymore in 2.4.10 and 2.4.12. Error messages are:

#####
ll_rw_block: device 0b:00: only 2048-char blocks implemented (512)
hfs_fs: unable to read block 0x00000002 from dev 0b:00
hfs_fs: Unable to read superblock
ll_rw_block: device 0b:00: only 2048-char blocks implemented (512)
hfs_fs: unable to read block 0x00000000 from dev 0b:00
hfs_fs: Unable to read block 0.
#####

Between 2.4.9 and 2.4.10, changes were made to this function
including:

#####
--- linux-2.4.9/drivers/block/ll_rw_blk.c Sat Aug 4 07:37:09 2001
+++ linux-2.4.10/drivers/block/ll_rw_blk.c Fri Sep 21 06:02:01 2001
[SNIP some other changes]
@@ -990,12 +973,7 @@
major = MAJOR(bhs[0]->b_dev);

/* Determine correct block size for this device. */
- correct_size = BLOCK_SIZE;
- if (blksize_size[major]) {
- i = blksize_size[major][MINOR(bhs[0]->b_dev)];
- if (i)
- correct_size = i;
- }
+ correct_size = get_hardsect_size(bhs[0]->b_dev);

/* Verify requested block sizes. */
for (i = 0; i < nr; i++) {
#####

A check then made on correct_size fails with the above error message.

-- 
DOLBEAU Romain               | Brothers of Metal will always be there     
ENS Cachan / Ker Lann        | Standing together with hands in the air    
Thesard IRISA / CAPS         |           -- Manowar,                      
dolbeaur@club-internet.fr    |                     'Brothers of Metal'
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