path: root/mm/msync.c
diff options
authorChristoph Hellwig <>2008-12-22 21:11:15 +0100
committerAl Viro <>2009-01-05 11:54:28 -0500
commit4c728ef583b3d82266584da5cb068294c09df31e (patch)
tree1252fa82b5a7cf60c0898c3da810228b4c34ebb3 /mm/msync.c
parent6110e3abbff8b785907d4db50240e63c1be726e3 (diff)
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 <> Signed-off-by: Al Viro <>
Diffstat (limited to 'mm/msync.c')
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/msync.c b/mm/msync.c
index 144a7570535d..07dae08cf31c 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -82,7 +82,7 @@ asmlinkage long sys_msync(unsigned long start, size_t len, int flags)
(vma->vm_flags & VM_SHARED)) {
- error = do_fsync(file, 0);
+ error = vfs_fsync(file, file->f_path.dentry, 0);
if (error || start >= end)
goto out;