Josef Bacik 18e9e5104f Introduce freeze_super and thaw_super for the fsfreeze ioctl ... Currently the way we do freezing is by passing sb>s_bdev to freeze_bdev and then letting it do all the work. But freezing is more of an fs thing, and doesn't really have much to do with the bdev at all, all the work gets done with the super. In btrfs we do not populate s_bdev, since we can have multiple bdev's for one fs and setting s_bdev makes removing devices from a pool kind of tricky. This means that freezing a btrfs filesystem fails, which causes us to corrupt with things like tux-on-ice which use the fsfreeze mechanism. So instead of populating sb->s_bdev with a random bdev in our pool, I've broken the actual fs freezing stuff into freeze_super and thaw_super. These just take the super_block that we're freezing and does the appropriate work. It's basically just copy and pasted from freeze_bdev. I've then converted freeze_bdev over to use the new super helpers. I've tested this with ext4 and btrfs and verified everything continues to work the same as before. The only new gotcha is multiple calls to the fsfreeze ioctl will return EBUSY if the fs is already frozen. I thought this was a better solution than adding a freeze counter to the super_block, but if everybody hates this idea I'm open to suggestions. Thanks, Signed-off-by: Josef Bacik <josef@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>		2010-05-21 18:31:18 -04:00
..
9p	9p: add bdi backing to mount session	2010-04-22 11:42:00 +02:00
adfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
affs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
afs	Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block	2010-04-28 07:56:05 -07:00
autofs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
autofs4	autofs4-2.6.34-rc1 - fix link_count usage	2010-05-10 09:48:10 -07:00
befs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
bfs	pass writeback_control to ->write_inode	2010-03-05 13:25:52 -05:00
btrfs	Merge git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-unstable	2010-05-15 12:55:31 -07:00
cachefiles	CacheFiles: Fix error handling in cachefiles_determine_cache_security()	2010-05-12 18:23:58 -07:00
ceph	ceph: should use deactivate_locked_super() on failure exits	2010-05-21 18:31:13 -04:00
cifs	cifs: fix noserverino handling when unix extensions are enabled	2010-05-17 20:59:21 +00:00
coda	coda: add bdi backing to mount session	2010-04-22 12:12:40 +02:00
configfs	Fix the regression created by "set S_DEAD on unlink()..." commit	2010-05-15 07:16:33 -04:00
cramfs
debugfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
devpts	Simplify devpts_get_sb() failure exits	2010-05-21 18:31:12 -04:00
dlm	dlm: fix ast ordering for user locks	2010-04-30 14:52:51 -05:00
ecryptfs	Clean ecryptfs ->get_sb() up	2010-05-21 18:31:13 -04:00
efs
exofs	exofs: Fix "add bdi backing to mount session" fall out	2010-04-29 20:35:29 +02:00
exportfs	nfs: new subdir Documentation/filesystems/nfs	2009-10-27 19:34:04 -04:00
ext2	quota: unify quota init condition in setattr	2010-05-21 19:30:45 +02:00
ext3	quota: unify quota init condition in setattr	2010-05-21 19:30:45 +02:00
ext4	quota: unify quota init condition in setattr	2010-05-21 19:30:45 +02:00
fat	Merge branch 'master' into export-slabh	2010-04-05 11:37:28 +09:00
freevxfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
fscache	fs-cache: order the debugfs stats correctly	2010-04-07 08:38:05 -07:00
fuse	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
gfs2	quota: unify ->set_dqblk	2010-05-21 19:30:44 +02:00
hfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
hfsplus	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
hostfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
hpfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
hppfs	hppfs can use existing proc_mnt, no need for do_kern_mount() in there	2010-03-03 14:08:00 -05:00
hugetlbfs	Untangling ima mess, part 1: alloc_file()	2009-12-16 12:16:47 -05:00
isofs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
jbd	ext3: Fix waiting on transaction during fsync	2010-05-21 19:30:41 +02:00
jbd2	jbd2: use NULL instead of 0 when pointer is needed	2010-05-11 10:04:36 +02:00
jffs2	jffs2: Stop triggering block erases from jffs2_write_super()	2010-05-19 17:16:11 +01:00
jfs	quota: unify quota init condition in setattr	2010-05-21 19:30:45 +02:00
lockd	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
logfs	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-05-20 09:20:59 -07:00
minix	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ncpfs	ncpfs: add bdi backing to mount session	2010-04-22 12:31:11 +02:00
nfs	NFS: Don't call iput() in nfs_access_cache_shrinker	2010-05-14 15:09:36 -04:00
nfs_common	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
nfsd	Revert "nfsd4: distinguish expired from stale stateids"	2010-05-18 19:03:50 -04:00
nilfs2	nilfs2: disallow remount of snapshot from/to a regular mount	2010-05-10 11:32:34 +09:00
nls	Merge git://git.kernel.org/pub/scm/linux/kernel/git/hirofumi/fatfs-2.6	2009-09-30 09:31:14 -07:00
notify	Saner locking around deactivate_super()	2010-05-21 18:31:14 -04:00
ntfs	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ocfs2	ocfs2: Fix lock inversion in quotas during umount	2010-05-21 19:30:48 +02:00
omfs	Merge branch 'master' into for-next	2010-04-23 02:08:44 +02:00
openpromfs
partitions	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
proc	Merge branch 'bkl/procfs' of git://git.kernel.org/pub/scm/linux/kernel/git/frederic/random-tracing	2010-05-19 17:23:28 -07:00
qnx4	fs/qnx4: decrement sizeof size in strncmp	2010-02-04 11:55:46 +01:00
quota	new helper: iterate_supers()	2010-05-21 18:31:16 -04:00
ramfs	devtmpfs: support !CONFIG_TMPFS	2010-05-21 09:37:30 -07:00
reiserfs	quota: unify quota init condition in setattr	2010-05-21 19:30:45 +02:00
romfs	fix leak in romfs_fill_super()	2010-01-26 22:22:26 -05:00
smbfs	smbfs: add bdi backing to mount session	2010-04-22 12:37:07 +02:00
squashfs	squashfs: fix potential buffer over-run on 4K block file systems	2010-04-25 02:09:05 +01:00
sysfs	sysfs: add struct file* to bin_attr callbacks	2010-05-21 09:37:31 -07:00
sysv	fs/sysv: dereferencing ERR_PTR()	2010-05-15 07:16:33 -04:00
ubifs	UBIFS: mark VFS SB RO too	2010-04-29 15:12:18 +03:00
udf	Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-udf-2.6	2010-05-21 11:17:43 -07:00
ufs	quota: unify quota init condition in setattr	2010-05-21 19:30:45 +02:00
xfs	quota: unify ->set_dqblk	2010-05-21 19:30:44 +02:00
aio.c	aio: remove unused field	2009-12-16 07:20:13 -08:00
anon_inodes.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
attr.c	fs: use rlimit helpers	2010-03-06 11:26:29 -08:00
bad_inode.c
binfmt_aout.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
binfmt_elf_fdpic.c	Remove redundant check for CONFIG_MMU	2010-04-27 09:01:26 -07:00
binfmt_elf.c	coredump: pass mm->flags as a coredump parameter for consistency	2010-03-06 11:26:46 -08:00
binfmt_em86.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
binfmt_flat.c	uclinux: error message when FLAT reloc symbol is invalid, v2	2010-04-21 13:28:49 +10:00
binfmt_misc.c
binfmt_script.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
binfmt_som.c	Split 'flush_old_exec' into two functions	2010-01-29 08:22:01 -08:00
bio-integrity.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
bio.c	Merge branch 'master' into for-linus	2010-03-19 08:05:10 +01:00
block_dev.c	Introduce freeze_super and thaw_super for the fsfreeze ioctl	2010-05-21 18:31:18 -04:00
buffer.c	new helper: iterate_supers()	2010-05-21 18:31:16 -04:00
char_dev.c	fs/char_dev.c: remove useless loop	2009-09-24 07:21:03 -07:00
compat_binfmt_elf.c	elf coredump: replace ELF_CORE_EXTRA_* macros by functions	2010-03-06 11:26:45 -08:00
compat_ioctl.c	pktcdvd: improve BKL and compat_ioctl.c usage	2010-04-29 08:44:37 -07:00
compat.c	revert "procfs: provide stack information for threads" and its fixup commits	2010-05-11 17:33:41 -07:00
dcache.c	fix prune_dcache()/umount() race	2010-05-21 18:31:16 -04:00
dcookies.c
direct-io.c	dio: fix use-after-free	2009-12-17 04:52:13 -05:00
drop_caches.c	new helper: iterate_supers()	2010-05-21 18:31:16 -04:00
eventfd.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
eventpoll.c	sched, wait: Use wrapper functions	2010-05-11 17:43:58 +02:00
exec.c	revert "procfs: provide stack information for threads" and its fixup commits	2010-05-11 17:33:41 -07:00
fcntl.c	fasync: RCU and fine grained locking	2010-04-21 16:19:29 -07:00
fifo.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
file_table.c	vfs: take f_lock on modifying f_mode after open time	2010-03-06 11:26:25 -08:00
file.c	fs: use rlimit helpers	2010-03-06 11:26:29 -08:00
filesystems.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
fs_struct.c
fs-writeback.c	Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block	2010-04-09 11:50:29 -07:00
generic_acl.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
inode.c	security: remove dead hook inode_delete	2010-04-12 12:19:15 +10:00
internal.h	Bury __put_super_and_need_restart()	2010-05-21 18:31:16 -04:00
ioctl.c	Introduce freeze_super and thaw_super for the fsfreeze ioctl	2010-05-21 18:31:18 -04:00
ioprio.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
Kconfig	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2010-03-19 09:43:06 -07:00
Kconfig.binfmt
libfs.c	FS / libfs: Implement simple_write_to_buffer	2010-05-10 23:08:17 +02:00
locks.c	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
Makefile	Take statfs variants to fs/statfs.c	2010-05-21 18:31:17 -04:00
mbcache.c
mpage.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
namei.c	Fix the regression created by "set S_DEAD on unlink()..." commit	2010-05-15 07:16:33 -04:00
namespace.c	Merge branch 'next' into for-linus	2010-05-18 08:57:00 +10:00
nfsctl.c	Switch may_open() and break_lease() to passing O_...	2010-03-03 13:00:21 -05:00
no-block.c
open.c	Take statfs variants to fs/statfs.c	2010-05-21 18:31:17 -04:00
pipe.c	fs: no games with DCACHE_UNHASHED	2009-12-17 10:51:40 -05:00
pnode.c	Kill CL_PROPAGATION, sanitize fs/pnode.c:get_source()	2010-03-03 13:00:22 -05:00
pnode.h	VFS: Clean up shared mount flag propagation	2010-03-03 14:07:55 -05:00
posix_acl.c
read_write.c	do_sync_read/write() should set kiocb.ki_nbytes to be consistent	2010-03-24 16:43:29 -07:00
read_write.h
readdir.c
select.c	Add generic sys_old_select()	2010-03-12 15:52:32 -08:00
seq_file.c	seq_file: fix new kernel-doc warnings	2010-03-07 15:48:26 -08:00
signalfd.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
splice.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
stack.c	VFS/fsstack: handle 32-bit smp + preempt + large files in fsstack_copy_inode_size	2009-12-17 10:58:17 -05:00
stat.c	Add unlocked version of inode_add_bytes() function	2009-12-23 13:33:54 +01:00
statfs.c	Take statfs variants to fs/statfs.c	2010-05-21 18:31:17 -04:00
super.c	Introduce freeze_super and thaw_super for the fsfreeze ioctl	2010-05-21 18:31:18 -04:00
sync.c	new helper: iterate_supers()	2010-05-21 18:31:16 -04:00
timerfd.c	fs/timerfd.c: make use of wait_event_interruptible_locked_irq()	2010-05-20 13:21:42 -07:00
utimes.c
xattr_acl.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
xattr.c	sanitize xattr handler prototypes	2009-12-16 12:16:49 -05:00