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fs/fat/: add support for DOS 1.x formatted volumes

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Add structure for parsed BPB information, struct fat_bios_param_block,
and move all of the deserialization and validation logic from
fat_fill_super() into fat_read_bpb().

Add a 'dos1xfloppy' mount option to infer DOS 2.x BIOS Parameter Block
defaults from block device geometry for ancient floppies and floppy
images, as a fall-back from the default BPB parsing logic.

When fat_read_bpb() finds an invalid FAT filesystem and dos1xfloppy is
set, fall back to fat_read_static_bpb().  fat_read_static_bpb()
validates that the entire BPB is zero, and that the floppy has a
DOS-style 8086 code bootstrapping header.  Then it fills in default BPB
values from media size and a table.[0]

Media size is assumed to be static for archaic FAT volumes.  See also:
[1].

Fixes kernel.org bug #42617.

[0]: https://en.wikipedia.org/wiki/File_Allocation_Table#Exceptions
[1]: http://www.win.tue.nl/~aeb/linux/fs/fat/fat-1.html

[[email protected]: fix missed error code]
Signed-off-by: Conrad Meyer <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Signed-off-by: OGAWA Hirofumi <[email protected]>
Tested-by: Alan Cox <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Conrad Meyer 2014-06-06 14:36:37 -07:00 • committed by Linus Torvalds
commit 190a8843de
3 changed files with 274 additions and 77 deletions
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5
Documentation/filesystems/vfat.txt
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@ -172,6 +172,11 @@ nfs=stale_rw|nostale_ro
To maintain backward compatibility, '-o nfs' is also accepted,
defaulting to stale_rw
dos1xfloppy -- If set, use a fallback default BIOS Parameter Block
configuration, determined by backing device size. These static
parameters match defaults assumed by DOS 1.x for 160 kiB,
180 kiB, 320 kiB, and 360 kiB floppies and floppy images.
<bool>: 0,1,yes,no,true,false