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Tejun Heo 151060ac13 CUSE: implement CUSE - Character device in Userspace 
CUSE enables implementing character devices in userspace.  With recent
additions of ioctl and poll support, FUSE already has most of what's
necessary to implement character devices.  All CUSE has to do is
bonding all those components - FUSE, chardev and the driver model -
nicely.

When client opens /dev/cuse, kernel starts conversation with
CUSE_INIT.  The client tells CUSE which device it wants to create.  As
the previous patch made fuse_file usable without associated
fuse_inode, CUSE doesn't create super block or inodes.  It attaches
fuse_file to cdev file->private_data during open and set ff->fi to
NULL.  The rest of the operation is almost identical to FUSE direct IO
case.

Each CUSE device has a corresponding directory /sys/class/cuse/DEVNAME
(which is symlink to /sys/devices/virtual/class/DEVNAME if
SYSFS_DEPRECATED is turned off) which hosts "waiting" and "abort"
among other things.  Those two files have the same meaning as the FUSE
control files.

The only notable lacking feature compared to in-kernel implementation
is mmap support.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
2009-06-09 11:24:11 +02:00
..
9p vfs: simple_set_mnt() should return void 2009-03-27 14:44:03 -04:00
adfs fs/adfs: return f_fsid for statfs(2) 2009-04-02 19:05:08 -07:00
affs fs/affs: return f_fsid for statfs(2) 2009-04-02 19:05:08 -07:00
afs AFS: Guard afs_file_readpage_read_complete() definition with CONFIG_AFS_FSCACHE 2009-04-17 09:55:19 -07:00
autofs Fix autofs_expire() 2009-04-20 23:01:15 -04:00
autofs4 autofs4: use memchr() in invalid_string() 2009-04-20 23:02:50 -04:00
befs befs: fix build on parisc 2009-04-08 10:21:43 -07:00
bfs
btrfs Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable 2009-04-21 14:12:58 -07:00
cachefiles CacheFiles: A cache that backs onto a mounted filesystem 2009-04-03 16:42:41 +01:00
cifs cifs: when renaming don't try to unlink negative dentry 2009-04-17 21:08:15 +00:00
coda constify dentry_operations: misc filesystems 2009-03-27 14:44:00 -04:00
configfs constify dentry_operations: configfs 2009-03-27 14:44:03 -04:00
cramfs fs/cramfs: return f_fsid for statfs(2) 2009-04-02 19:05:08 -07:00
debugfs debugfs: function to know if debugfs is initialized 2009-03-23 16:25:46 +01:00
devpts Merge code for single and multiple-instance mounts 2009-03-27 14:44:04 -04:00
dlm dlm: fix length calculation in compat code 2009-03-11 12:23:59 -05:00
ecryptfs ecryptfs: use memdup_user() 2009-04-20 23:02:51 -04:00
efs fs/efs: return f_fsid for statfs(2) 2009-04-02 19:05:09 -07:00
exofs exofs: Documentation 2009-03-31 19:44:38 +03:00
exportfs
ext2 ext2: fix data corruption for racing writes 2009-04-13 15:04:33 -07:00
ext3 ext3: Try to avoid starting a transaction in writepage for data=writepage 2009-04-08 13:15:10 -04:00
ext4 ext4: Remove code handling bio_alloc failure with __GFP_WAIT 2009-04-15 12:10:13 +02:00
fat vfat: Note the NLS requirement 2009-04-17 09:32:11 -07:00
freevxfs
fscache FS-Cache: Implement data I/O part of netfs API 2009-04-03 16:42:39 +01:00
fuse CUSE: implement CUSE - Character device in Userspace 2009-06-09 11:24:11 +02:00
gfs2 GFS2: Fix page_mkwrite() return code 2009-04-20 16:02:02 +01:00
hfs hfs: fix memory leak when unmounting 2009-04-13 15:04:29 -07:00
hfsplus Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-04-02 21:09:10 -07:00
hostfs constify dentry_operations: misc filesystems 2009-03-27 14:44:00 -04:00
hpfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-04-02 21:09:10 -07:00
hppfs hppfs: hppfs_read_file() may return -ERROR 2009-04-02 19:04:53 -07:00
hugetlbfs hugetlbfs: return negative error code for bad mount option 2009-04-21 13:41:48 -07:00
isofs fs/isofs: return f_fsid for statfs(2) 2009-04-02 19:05:09 -07:00
jbd jbd: update locking coments 2009-04-13 15:04:32 -07:00
jbd2 jbd2: use WRITE_SYNC_PLUG instead of WRITE_SYNC 2009-04-06 08:04:54 -07:00
jffs2 Merge git://git.infradead.org/mtd-2.6 2009-04-06 14:56:26 -07:00
jfs New helper - current_umask() 2009-03-31 23:00:26 -04:00
lockd Merge branch 'for-2.6.30' of git://linux-nfs.org/~bfields/linux 2009-04-06 13:25:56 -07:00
minix fs/minix: return f_fsid for statfs(2) 2009-04-02 19:05:09 -07:00
ncpfs ncpfs: use memdup_user() 2009-04-20 23:02:51 -04:00
nfs NFS: Fix the XDR iovec calculation in nfs3_xdr_setaclargs 2009-04-21 07:46:49 -07:00
nfs_common
nfsd Fix i_mutex vs. readdir handling in nfsd 2009-04-20 23:01:16 -04:00
nilfs2 nilfs2: fix possible mismatch of sufile counters on recovery 2009-04-13 09:53:52 +09:00
nls
notify fs: avoid I_NEW inodes 2009-03-27 14:44:05 -04:00
ntfs ntfs: remove private wrapper of endian helpers 2009-04-01 08:59:18 -07:00
ocfs2 ocfs2: fix i_mutex locking in ocfs2_splice_to_file() 2009-04-15 12:10:12 +02:00
omfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-04-02 21:09:10 -07:00
openpromfs
partitions Merge branch 'tracing/core-v2' into tracing-for-linus 2009-04-02 00:49:02 +02:00
proc proc: mounts_poll() make consistent to mdstat_poll 2009-04-16 16:17:10 -07:00
qnx4 fs/qnx4: return f_fsid for statfs(2) 2009-04-02 19:05:10 -07:00
quota vfs: skip I_CLEAR state inodes 2009-04-02 19:04:48 -07:00
ramfs ramfs: fix double freeing s_fs_info on failed mount 2009-04-07 07:39:59 -07:00
reiserfs Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2009-04-02 21:09:10 -07:00
romfs fs/romfs: return f_fsid for statfs(2) 2009-04-07 08:31:10 -07:00
smbfs constify dentry_operations: misc filesystems 2009-03-27 14:44:00 -04:00
squashfs Merge branch 'kmemtrace-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2009-04-06 13:30:00 -07:00
sysfs sysfs: use memdup_user() 2009-04-20 23:02:50 -04:00
sysv fs/sysv: return f_fsid for statfs(2) 2009-04-02 19:05:10 -07:00
ubifs Merge branch 'linux-next' of git://git.infradead.org/ubifs-2.6 2009-04-06 15:00:19 -07:00
udf udf: Don't write integrity descriptor too often 2009-04-02 13:36:28 +02:00
ufs fs/ufs: return f_fsid for statfs(2) 2009-04-02 19:05:10 -07:00
xfs xfs: use memdup_user() 2009-04-20 23:02:51 -04:00
aio.c aio: lookup_ioctx can return the wrong value when looking up a bogus context 2009-03-19 15:57:18 -07:00
anon_inodes.c constify dentry_operations: rest 2009-03-27 14:44:03 -04:00
attr.c vfs: Use lowercase names of quota functions 2009-03-26 02:18:35 +01:00
bad_inode.c
binfmt_aout.c
binfmt_elf.c Trim includes in binfmt_elf 2009-03-31 23:00:27 -04:00
binfmt_elf_fdpic.c bin_elf_fdpic: check the return value of clear_user 2009-04-02 19:05:01 -07:00
binfmt_em86.c
binfmt_flat.c
binfmt_misc.c
binfmt_script.c
binfmt_som.c Don't crap into descriptor table in binfmt_som 2009-03-31 23:00:28 -04:00
bio-integrity.c block: add private bio_set for bio integrity allocations 2009-03-24 12:35:17 +01:00
bio.c bio: add documentation to bio_alloc() 2009-04-15 12:10:12 +02:00
block_dev.c Cleanup after commit 585d3bc06f 2009-04-01 07:07:16 -04:00
buffer.c Add block_write_full_page_endio for passing endio handler 2009-04-16 07:47:49 -07:00
char_dev.c
compat.c kill vfs_stat_fd / vfs_lstat_fd 2009-04-20 23:02:52 -04:00
compat_binfmt_elf.c
compat_ioctl.c fs/compat_ioctl: fix build when !BLOCK 2009-04-20 23:01:16 -04:00
dcache.c No need for crossing to mountpoint in audit_tag_tree() 2009-04-20 23:01:15 -04:00
dcookies.c
direct-io.c dio: Remove code handling bio_alloc failure with __GFP_WAIT 2009-04-15 12:10:13 +02:00
drop_caches.c vfs: skip I_CLEAR state inodes 2009-04-02 19:04:48 -07:00
eventfd.c epoll keyed wakeups: make eventfd use keyed wakeups 2009-04-01 08:59:20 -07:00
eventpoll.c epoll keyed wakeups: teach epoll about hints coming with the wakeup key 2009-04-01 08:59:20 -07:00
exec.c Get rid of indirect include of fs_struct.h 2009-03-31 23:00:27 -04:00
fcntl.c Fix a lockdep warning in fasync_helper() 2009-03-30 08:00:24 -06:00
fifo.c
file.c
file_table.c trivial: remove unused variable 'path' in alloc_file() 2009-03-30 15:22:03 +02:00
filesystems.c fs: Mark get_filesystem_list() as __init function. 2009-04-20 23:02:52 -04:00
fs-writeback.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2009-04-03 15:24:35 -07:00
fs_struct.c Get rid of indirect include of fs_struct.h 2009-03-31 23:00:27 -04:00
generic_acl.c New helper - current_umask() 2009-03-31 23:00:26 -04:00
inode.c splice: add helpers for locking pipe inode 2009-04-15 12:10:12 +02:00
internal.h New locking/refcounting for fs_struct 2009-03-31 23:00:26 -04:00
ioctl.c Rationalize fasync return values 2009-03-16 08:34:35 -06:00
ioprio.c
Kconfig CUSE: implement CUSE - Character device in Userspace 2009-06-09 11:24:11 +02:00
Kconfig.binfmt
libfs.c kmemtrace, fs: uninline simple_transaction_set() 2009-04-03 12:09:09 +02:00
locks.c
Makefile nilfs2: update makefile and Kconfig 2009-04-07 08:31:16 -07:00
mbcache.c
mpage.c Remove two unneeded exports and make two symbols static in fs/mpage.c 2009-04-01 07:38:54 -04:00
namei.c Fix i_mutex vs. readdir handling in nfsd 2009-04-20 23:01:16 -04:00
namespace.c Touch all affected namespaces on propagation of mount 2009-04-20 23:01:15 -04:00
nfsctl.c
no-block.c
open.c Get rid of indirect include of fs_struct.h 2009-03-31 23:00:27 -04:00
pipe.c splice: add helpers for locking pipe inode 2009-04-15 12:10:12 +02:00
pnode.c
pnode.h
posix_acl.c
read_write.c Make non-compat preadv/pwritev use native register size 2009-04-04 14:20:34 -07:00
read_write.h
readdir.c
select.c
seq_file.c cpumask: fix seq_bitmap_*() functions. 2009-03-30 22:05:11 +10:30
signalfd.c
splice.c splice: fix new kernel-doc warnings 2009-04-17 07:38:07 -07:00
stack.c
stat.c kill vfs_stat_fd / vfs_lstat_fd 2009-04-20 23:02:52 -04:00
super.c namespaces: move proc_net_get_sb to a generic fs/super.c helper 2009-04-07 08:31:09 -07:00
sync.c Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-quota-2.6 2009-03-27 14:48:34 -07:00
timerfd.c timerfd: add flags check 2009-02-18 15:37:53 -08:00
utimes.c
xattr.c xattr: use memdup_user() 2009-04-20 23:02:50 -04:00
xattr_acl.c