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| author | Eric Sandeen <esandeen@redhat.com> | 2006-09-29 01:59:41 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-29 09:18:09 -0700 |
| commit | 39b3f6d6e915aa29ad6f90d1517d9217f903c8dc (patch) | |
| tree | 5297a26715e78ef2f0a22424357076982c98a0fb /fs | |
| parent | 6c5c934153513dc72e2d6464f39e8ef1f27c0a3e (diff) | |
| download | lwn-39b3f6d6e915aa29ad6f90d1517d9217f903c8dc.tar.gz lwn-39b3f6d6e915aa29ad6f90d1517d9217f903c8dc.zip | |
[PATCH] mount udf UDF_PART_FLAG_READ_ONLY partitions with MS_RDONLY
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/udf/super.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/udf/super.c b/fs/udf/super.c index 5dd356cbbda6..1d3b5d2070e5 100644 --- a/fs/udf/super.c +++ b/fs/udf/super.c @@ -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"); |