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| author | Thomas Stewart <thomas@stewarts.org.uk> | 2010-05-26 14:42:33 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:43 -0700 |
| commit | d27d7a9a7838587fcdcc6f2b042f5610eb4984a1 (patch) | |
| tree | 1f54d3904a7a80cb483074478aaa36e72f60cd6b /fs | |
| parent | b8d6b0d6b6882a53e4586a07e1292223d55299d1 (diff) | |
| download | linux-next-d27d7a9a7838587fcdcc6f2b042f5610eb4984a1.tar.gz | |
ufs: permit mounting of BorderWare filesystems
I recently had to recover some files from an old broken machine that was
running BorderWare Document Gateway. It's basically a drop in web server
for sharing files. From the look of the init process and using strings on
of a few files it seems to be based on FreeBSD 3.3.
The process turned out to be more difficult than I imagined, but to cut a
long story short BorderWare in their wisdom use a nonstandard magic number
in their UFS (ufstype=44bsd) file systems. Thus Linux refuses to mount
the file systems in order to recover the data. After a bit of hunting I
was able to make a quick fix to fs/ufs/super.c in order to detect the new
magic number.
I assume that this number is the same for all installations. It's quite
easy to find out from ufs_fs.h. The superblock sits 8k into the block
device and the magic number its 1372 bytes into the superblock struct.
# dd if=/dev/sda5 skip=$(( 8192 + 1372 )) bs=1 count=4 2> /dev/null | hd
00000000 97 26 24 0f |.&$.|
#
Signed-off-by: Thomas Stewart <thomas@stewarts.org.uk>
Cc: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ufs/super.c | 2 | ||||
| -rw-r--r-- | fs/ufs/ufs_fs.h | 1 |
2 files changed, 3 insertions, 0 deletions
diff --git a/fs/ufs/super.c b/fs/ufs/super.c index 14743d935a93..ad9bc1ebd3a6 100644 --- a/fs/ufs/super.c +++ b/fs/ufs/super.c @@ -918,6 +918,7 @@ again: sbi->s_bytesex = BYTESEX_LE; switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) { case UFS_MAGIC: + case UFS_MAGIC_BW: case UFS2_MAGIC: case UFS_MAGIC_LFN: case UFS_MAGIC_FEA: @@ -927,6 +928,7 @@ again: sbi->s_bytesex = BYTESEX_BE; switch ((uspi->fs_magic = fs32_to_cpu(sb, usb3->fs_magic))) { case UFS_MAGIC: + case UFS_MAGIC_BW: case UFS2_MAGIC: case UFS_MAGIC_LFN: case UFS_MAGIC_FEA: diff --git a/fs/ufs/ufs_fs.h b/fs/ufs/ufs_fs.h index 6943ec677c0b..8aba544f9fad 100644 --- a/fs/ufs/ufs_fs.h +++ b/fs/ufs/ufs_fs.h @@ -48,6 +48,7 @@ typedef __u16 __bitwise __fs16; #define UFS_SECTOR_SIZE 512 #define UFS_SECTOR_BITS 9 #define UFS_MAGIC 0x00011954 +#define UFS_MAGIC_BW 0x0f242697 #define UFS2_MAGIC 0x19540119 #define UFS_CIGAM 0x54190100 /* byteswapped MAGIC */ |