[PATCH 0/1] hfsplus: fix longname handling

[Sougata Santra <sougata@tuxera.com>]

Hi,

Longname is not correctly handled by hfsplus driver. If an attempt to
create a longname(>255) file/directory is made, it succeeds by creating
a file/directory with HFSPLUS_MAX_STRLEN and incorrect catalog key.
Thus leaving the volume in an inconsistent state. This patch fixes
this issue.

Although lookup is always called first to create a negative entry, so just
doing a check in lookup would probably fix this issue. I choose to propagate
error to other iops as well.

Please NOTE: I have factored out hfsplus_cat_build_key_with_cnid from 
hfsplus_cat_build_key, to avoid unncessary branching.

Thanks a lot.

TEST:
------
dir="TEST_DIR"
cdir=`pwd`
name255="_123456789_123456789_123456789_123456789_123456789_123456789\
_123456789_123456789_123456789_123456789_123456789_123456789_123456789\
_123456789_123456789_123456789_123456789_123456789_123456789_123456789\
_123456789_123456789_123456789_123456789_123456789_1234"
name256="${name255}5"

mkdir $dir
cd $dir
touch $name255
rm -f $name255
touch $name256
ls -la
cd $cdir
rm -rf $dir


RESULT:
-------
[sougata@ultrabook tmp]$ cdir=`pwd`
[sougata@ultrabook tmp]$ 
name255="_123456789_123456789_123456789_123456789_123456789_123456789\
 > _123456789_123456789_123456789_123456789_123456789_123456789_123456789\
 > _123456789_123456789_123456789_123456789_123456789_123456789_123456789\
 > _123456789_123456789_123456789_123456789_123456789_1234"
[sougata@ultrabook tmp]$ name256="${name255}5"
[sougata@ultrabook tmp]$
[sougata@ultrabook tmp]$ mkdir $dir
[sougata@ultrabook tmp]$ cd $dir
[sougata@ultrabook TEST_DIR]$ touch $name255
[sougata@ultrabook TEST_DIR]$ rm -f $name255
[sougata@ultrabook TEST_DIR]$ touch $name256
[sougata@ultrabook TEST_DIR]$ ls -la
ls: cannot access 
_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_1234:
No such file or directory
total 0
drwxrwxr-x 1 sougata sougata 3 Feb 20 19:56 .
drwxrwxrwx 1 root    root    6 Feb 20 19:56 ..
-????????? ? ?       ?       ?            ? 
_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_123456789_1234
[sougata@ultrabook TEST_DIR]$ cd $cdir
[sougata@ultrabook tmp]$ rm -rf $dir
rm: cannot remove ‘TEST_DIR’: Directory not empty


Sougata Santra (1):
  hfsplus: fix longname handling

 fs/hfsplus/catalog.c    | 89 ++++++++++++++++++++++++++++++++++++-------------
 fs/hfsplus/dir.c        | 11 ++++--
 fs/hfsplus/hfsplus_fs.h |  4 ++-
 fs/hfsplus/super.c      |  4 ++-
 4 files changed, 79 insertions(+), 29 deletions(-)

-- 
1.8.5.3