android_kernel_xiaomi_sm8350/fs/nfsd
Christoph Hellwig 4c728ef583 add a vfs_fsync helper
Fsync currently has a fdatawrite/fdatawait pair around the method call,
and a mutex_lock/unlock of the inode mutex.  All callers of fsync have
to duplicate this, but we have a few and most of them don't quite get
it right.  This patch adds a new vfs_fsync that takes care of this.
It's a little more complicated as usual as ->fsync might get a NULL file
pointer and just a dentry from nfsd, but otherwise gets afile and we
want to take the mapping and file operations from it when it is there.

Notes on the fsync callers:

 - ecryptfs wasn't calling filemap_fdatawrite / filemap_fdatawait on the
   	lower file
 - coda wasn't calling filemap_fdatawrite / filemap_fdatawait on the host
	file, and returning 0 when ->fsync was missing
 - shm wasn't calling either filemap_fdatawrite / filemap_fdatawait nor
   taking i_mutex.  Now given that shared memory doesn't have disk
   backing not doing anything in fsync seems fine and I left it out of
   the vfs_fsync conversion for now, but in that case we might just
   not pass it through to the lower file at all but just call the no-op
   simple_sync_file directly.

[and now actually export vfs_fsync]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2009-01-05 11:54:28 -05:00
..
auth.c CRED: Differentiate objective and effective subjective credentials on a task 2008-11-14 10:39:26 +11:00
auth.h
export.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6 2008-10-23 10:22:40 -07:00
lockd.c
Makefile
nfs2acl.c
nfs3acl.c
nfs3proc.c
nfs3xdr.c
nfs4acl.c
nfs4callback.c nfsd: support callbacks with gss flavors 2008-12-23 16:19:00 -05:00
nfs4idmap.c
nfs4proc.c
nfs4recover.c Merge branch 'master' into next 2008-12-04 17:16:36 +11:00
nfs4state.c Merge branch 'devel' into next 2008-12-30 16:51:43 -05:00
nfs4xdr.c
nfscache.c
nfsctl.c fs: replace NIPQUAD() 2008-10-31 00:56:28 -07:00
nfsfh.c CRED: Inaugurate COW credentials 2008-11-14 10:39:23 +11:00
nfsproc.c
nfssvc.c NFSD: Fix BUG during NFSD shutdown processing 2008-10-22 13:36:05 -04:00
nfsxdr.c
stats.c
vfs.c add a vfs_fsync helper 2009-01-05 11:54:28 -05:00