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authorChristoph Hellwig <hch@lst.de>2008-12-22 21:11:15 +0100
committerAl Viro <viro@zeniv.linux.org.uk>2009-01-05 11:54:28 -0500
commit4c728ef583b3d82266584da5cb068294c09df31e (patch)
tree1252fa82b5a7cf60c0898c3da810228b4c34ebb3 /drivers/usb
parent6110e3abbff8b785907d4db50240e63c1be726e3 (diff)
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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>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/file_storage.c18
1 files changed, 1 insertions, 17 deletions
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index c4e62a6..2e71368 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1863,26 +1863,10 @@ static int do_write(struct fsg_dev *fsg)
static int fsync_sub(struct lun *curlun)
{
struct file *filp = curlun->filp;
- struct inode *inode;
- int rc, err;
if (curlun->ro || !filp)
return 0;
- if (!filp->f_op->fsync)
- return -EINVAL;
-
- inode = filp->f_path.dentry->d_inode;
- mutex_lock(&inode->i_mutex);
- rc = filemap_fdatawrite(inode->i_mapping);
- err = filp->f_op->fsync(filp, filp->f_path.dentry, 1);
- if (!rc)
- rc = err;
- err = filemap_fdatawait(inode->i_mapping);
- if (!rc)
- rc = err;
- mutex_unlock(&inode->i_mutex);
- VLDBG(curlun, "fdatasync -> %d\n", rc);
- return rc;
+ return vfs_fsync(filp, filp->f_path.dentry, 1);
}
static void fsync_all(struct fsg_dev *fsg)