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[PATCH] mount udf UDF_PART_FLAG_READ_ONLY partitions with MS_RDONLY

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There's a bug where a UDF_PART_FLAG_READ_ONLY udf partition gets mounted
read-write, then subsequent problems happen; files seem to be able to be
removed, but file creation results in EIO or worse, oops.

EIO is coming from udf_new_block(), which returns EIO if the right flags
aren't set; only UDF_PART_FLAG_READ_ONLY is set in this case.  We probably
s hould not have gotten this far...

Attached patch seems to fix it - and includes a printk to alert the user
that their "rw" mount request has been converted to "ro."

Here's the testcase I used:

[root@magnesium ~]# mkisofs -R -J -udf -o testiso /tmp/
...
Total translation table size: 0
Total rockridge attributes bytes: 342923
Total directory bytes: 382312
Path table size(bytes): 104
Max brk space used 103000
105059 extents written (205 MB)

[root@magnesium ~]# mount -o loop testiso /mnt/test/
[root@magnesium ~]# ls /mnt/test/fsfile
/mnt/test/fsfile
[root@magnesium ~]# rm /mnt/test/fsfile
[root@magnesium ~]# ls /mnt/test/fsfile
ls: /mnt/test/fsfile: No such file or directory
[root@magnesium ~]# touch /mnt/test/fsfile
touch: cannot touch `/mnt/test/fsfile': Input/output error
[root@magnesium tmp]# grep udf /proc/mounts
/dev/loop1 /mnt/test udf rw 0 0

Force readonly mounts of UDF partitions marked as read-only.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Eric Sandeen 2006-09-29 01:59:41 -07:00 committed by Linus Torvalds
parent 6c5c934153
commit 39b3f6d6e9
1 changed files with 4 additions and 0 deletions
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4
fs/udf/super.c
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@ -1621,6 +1621,10 @@ static int udf_fill_super(struct super_block *sb, void *options, int silent)
goto error_out;
}
if (UDF_SB_PARTFLAGS(sb, UDF_SB_PARTITION(sb)) & UDF_PART_FLAG_READ_ONLY)
printk("UDF-fs: Partition marked readonly; forcing readonly mount\n");
sb->s_flags |= MS_RDONLY;
if ( udf_find_fileset(sb, &fileset, &rootdir) )
{
printk("UDF-fs: No fileset found\n");