[PATCH] fuse: relax inode_lock on fsync(2)

[Maxim Patlasov]

Sometimes handling FUSE_FSYNC in userspace may take a while. No need
to block incoming writes while userspace processes FUSE_FSYNC.

Signed-off-by: Maxim Patlasov <mpatla...@virtuozzo.com>
---
 fs/fuse/file.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2401c5d..9d52a8a 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -483,6 +483,8 @@ int fuse_fsync_common(struct file *file, loff_t start, 
loff_t end,
        if ((!isdir && fc->no_fsync) || (isdir && fc->no_fsyncdir))
                goto out;
 
+       inode_unlock(inode);
+
        memset(&inarg, 0, sizeof(inarg));
        inarg.fh = ff->fh;
        inarg.fsync_flags = datasync ? 1 : 0;
@@ -499,6 +501,7 @@ int fuse_fsync_common(struct file *file, loff_t start, 
loff_t end,
                        fc->no_fsync = 1;
                err = 0;
        }
+       return err;
 out:
        inode_unlock(inode);
        return err;