hfsplus: implement attributes file creation functionality
authorVyacheslav Dubeyko <slava@dubeyko.com>
Tue, 12 Nov 2013 23:11:09 +0000 (15:11 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Wed, 13 Nov 2013 03:09:32 +0000 (12:09 +0900)
commit95e0d7dbb9b28ab0dfad7c7316066b05e1f1d4cd
tree09f42df8169a4fbf3e2f60cb1b36c1e83c8d9019
parent099e9245e04d50bb12ed621b4fa61df0a4c9dba9
hfsplus: implement attributes file creation functionality

Implement functionality of creation AttributesFile metadata file on HFS+
volume in the case of absence of it.

It makes trying to open AttributesFile's B-tree during mount of HFS+
volume.  If HFS+ volume hasn't AttributesFile then a pointer on
AttributesFile's B-tree keeps as NULL.  Thereby, when it is discovered
absence of AttributesFile on HFS+ volume in the begin of xattr creation
operation then AttributesFile will be created.

The creation of AttributesFile will have success in the case of
availability (2 * clump) free blocks on HFS+ volume.  Otherwise,
creation operation is ended with error (-ENOSPC).

Signed-off-by: Vyacheslav Dubeyko <slava@dubeyko.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Acked-by: Hin-Tak Leung <htl10@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/hfsplus/hfsplus_fs.h
fs/hfsplus/super.c
fs/hfsplus/xattr.c