From: Junjiro Okajima <hooanon05@yahoo.co.jp>
initial commit
aufs configuration and Makefile
Signed-off-by: Junjiro Okajima <hooanon05@yahoo.co.jp>
---
fs/aufs/Kconfig | 174 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/aufs/Makefile | 39 ++++++++++++
2 files changed, 213 insertions(+), 0 deletions(-)
create mode 100644 fs/aufs/Kconfig
create mode 100644 fs/aufs/Makefile
diff --git a/fs/aufs/Kconfig b/fs/aufs/Kconfig
new file mode 100644
index 0000000..338c01c
--- /dev/null
+++ b/fs/aufs/Kconfig
@@ -0,0 +1,174 @@
+config AUFS
+ bool "Another unionfs (EXPERIMENTAL)"
+ depends on EXPERIMENTAL
+ help
+ Aufs is a stackable unification filesystem such as Unionfs,
+ which unifies several directories and provides a merged single
+ directory.
+ In the early days, aufs was entirely re-designed and
+ re-implemented Unionfs Version 1.x series. After many original
+ ideas, approaches and improvements, it becomes totally
+ different from Unionfs while keeping the basic features.
+ See Unionfs for the basic features.
+
+if AUFS
+choice
+ prompt "Maximum number of branches"
+ default AUFS_BRANCH_MAX_127
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has an impact to performance.
+config AUFS_BRANCH_MAX_127
+ bool "127"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has an impact to performance.
+config AUFS_BRANCH_MAX_511
+ bool "511"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has an impact to performance.
+config AUFS_BRANCH_MAX_1023
+ bool "1023"
+ help
+ Specifies the maximum number of branches (or member directories)
+ in a single aufs. The larger value consumes more system
+ resources and has an impact to performance.
+# config AUFS_BRANCH_MAX_32767
+# bool "32767"
+# help
+# Specifies the maximum number of branches (or member directories)
+# in a single aufs. The larger value consumes more system
+# resources and has an impact to performance.
+endchoice
+
+config AUFS_STAT
+ bool "Use <sysfs>/fs/aufs/stat"
+ depends on SYSFS
+ help
+ Shows some statistic data via <sysfs>/fs/aufs/stat.
+ See detail in aufs.5.
+
+config AUFS_HINOTIFY
+ bool "Use inotify to detect actions on a branch"
+ depends on INOTIFY
+ help
+ If you want to modify files on branches directly, eg. bypassing aufs,
+ and want aufs to detect the changes of them fully, then enable this
+ option and use 'udba=inotify' mount option.
+ It will have a negative impact to the performance.
+ See detail in aufs.5.
+
+config AUFS_EXPORT
+ bool "NFS-exportable aufs"
+ # module will be available in the future
+ depends on EXPORTFS = y
+ help
+ If you want to export your mounted aufs, then enable this
+ option. There are several requirements to export aufs.
+ See detail in aufs.5.
+
+config AUFS_ROBR
+ bool "Aufs as an readonly branch of another aufs"
+ help
+ If you want make your aufs to be a part of another aufs, then
+ enable this option. In other words, you can specify your aufs
+ path in 'br:' mount option for another aufs, but cannot
+ specify 'rw' as the branch permission.
+ It will have a negative impact to the performance.
+ See detail in aufs.5.
+
+config AUFS_DLGT
+ bool "Delegate the internal branch access the kernel thread"
+ help
+ If you want aufs to delegate
+ the internal access to the branches which is made by aufs, to
+ the kernel thread, in order to hide the access issued by your
+ application from your LSM or something or make your
+ application to be traced strictly by the task I/O accounting,
+ then enable this option and use 'dlgt' mount option.
+ It will have a negative impact to the performance.
+ See detail in aufs.5.
+
+config AUFS_HIN_OR_DLGT
+ bool
+ depends on AUFS_HINOTIFY || AUFS_DLGT
+ default y
+ help
+ Automatic configuration for internal use.
+
+config AUFS_SHWH
+ bool "Show whiteouts"
+ help
+ If you want to make the whiteouts in aufs visible, then enable
+ this option and specify 'shwh' mount option. Although it may
+ sounds like philosophy or something, but in technically it
+ simply shows the name of whiteout with keeping its behaviour.
+
+config AUFS_BR_NFS
+ bool
+ depends on NFS_FS
+ default y
+ help
+ Automatic configuration for internal use.
+ When aufs supports NFS branch, enabled automatically.
+
+config AUFS_BR_XFS
+ bool
+ depends on XFS_FS
+ default y
+ help
+ Automatic configuration for internal use.
+ When aufs supports XFS branch, enabled automatically.
+
+config AUFS_WORKAROUND_FUSE
+ bool "Special handling for FUSE-based filesystem"
+ depends on FUSE_FS
+ help
+ A FUSE-based filesystem may not initialize its inode
+ attributes and the FUSE developer thinks the inode attributes
+ in a positive dentry which is returned by VFS lookup operation
+ are not reliable.
+ If you use a FUSE-based filesystem as an aufs branch, and it
+ customizes the inode attribute on it without overriding
+ fuse_lowlevel_ops.lookup, probably you need to enable this
+ configuration.
+ If you enable this configuration, aufs calls getattr operation
+ in every lookup and revalidate operation for the FUSE-based
+ filesystem branch.
+ It will have a negative impact to the performance even if you don't use a
+ FUSE-based filesystem branch.
+
+config AUFS_DEBUG
+ bool "Debug aufs"
+ help
+ Enable this to compile aufs internal debug code.
+ It will have a negative impact to the performance.
+
+config AUFS_MAGIC_SYSRQ
+ bool
+ depends on AUFS_DEBUG && MAGIC_SYSRQ
+ default y
+ help
+ Automatic configuration for internal use.
+ When aufs supports Magic SysRq, enabled automatically.
+
+config AUFS_COMPAT
+ bool "Compatibility with Unionfs"
+ help
+ This makes aufs compatible with unionfs-style mount options and some
+ behaviours.
+ The dirs= mount option and =nfsro branch permission flag are always
+ interpreted as br: mount option and =ro flag respectively. The
+ 'debug', 'delete' and 'imap' mount options are ignored.
+ If you disable this option, you will get,
+ - aufs issues a warning about the ignored mount options
+ - the default branch permission flag is set. RW for the first branch,
+ and RO for the rests.
+ - the name of a internal file which represents the directory is
+ 'opaque', becomes '.wh..wh..opq'
+ - the 'diropq=w' mount option is set by default
+endif
diff --git a/fs/aufs/Makefile b/fs/aufs/Makefile
new file mode 100644
index 0000000..4255dbe
--- /dev/null
+++ b/fs/aufs/Makefile
@@ -0,0 +1,39 @@
+
+# defined in ${srctree}/fs/fuse/inode.c
+ccflags-$(AUFS_WORKAROUND_FUSE) += -DFUSE_SUPER_MAGIC=0x65735546
+
+# defined in ${srctree}/fs/xfs/xfs_sb.h
+ifdef CONFIG_XFS_FS
+ccflags-y += -DXFS_SB_MAGIC=0x58465342
+endif
+
+# defined in ${srctree}/mm/shmem.c
+ifdef CONFIG_TMPFS
+ccflags-y += -DTMPFS_MAGIC=0x01021994
+endif
+
+########################################
+
+obj-$(CONFIG_AUFS) += aufs.o
+aufs-y := module.o super.o sbinfo.o branch.o xino.o sysaufs.o opts.o \
+ wkq.o vfsub.o dcsub.o \
+ cpup.o whout.o plink.o wbr_policy.o \
+ dentry.o dinfo.o \
+ file.o f_op.o finfo.o \
+ dir.o vdir.o \
+ inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o iinfo.o \
+ misc.o
+
+aufs-$(CONFIG_SYSFS) += sysfs.o
+aufs-$(CONFIG_AUFS_BR_NFS) += br_nfs.o
+aufs-$(CONFIG_AUFS_BR_XFS) += br_xfs.o
+aufs-$(CONFIG_AUFS_WORKAROUND_FUSE) += br_fuse.o
+aufs-$(CONFIG_AUFS_DLGT) += dlgt.o
+aufs-$(CONFIG_AUFS_HINOTIFY) += hinotify.o
+aufs-$(CONFIG_AUFS_HIN_OR_DLGT) += hin_or_dlgt.o
+aufs-$(CONFIG_AUFS_EXPORT) += export.o
+aufs-$(CONFIG_AUFS_ROBR) += robr.o
+# reserved for future use
+#aufs-$(CONFIG_AUFS_XATTR) += xattr.o
+aufs-$(CONFIG_AUFS_DEBUG) += debug.o
+aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o
--
1.5.5.1.308.g1fbb5.dirty
--
