Return-Path: From: NeilBrown To: Trond Myklebust , Anna Schumaker , Jeff Layton Date: Wed, 12 Oct 2016 13:39:18 +1100 Subject: [PATCH 1/5] NFS: remove l_pid field from nfs_lockowner Cc: Benjamin Coddington , Linux NFS Mailing List Message-ID: <147623995844.19592.4907099762700740448.stgit@noble> In-Reply-To: <147623977637.19592.12766016823334433969.stgit@noble> References: <147623977637.19592.12766016823334433969.stgit@noble> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" List-ID: this field is not used in any important way and probably should have been removed by Commit: 8003d3c4aaa5 ("nfs4: treat lock owners as opaque values") which removed the pid argument from nfs4_get_lock_state. Except in unusual and uninteresting cases, two threads with the same ->tgid will have the same ->files pointer, so keeping them both for comparison brings no benefit. Signed-off-by: NeilBrown --- fs/nfs/inode.c | 3 --- fs/nfs/nfs4proc.c | 1 - fs/nfs/pagelist.c | 3 +-- fs/nfs/write.c | 3 +-- include/linux/nfs_fs.h | 1 - 5 files changed, 2 insertions(+), 9 deletions(-) diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c index bf4ec5ecc97e..1752fc7c0024 100644 --- a/fs/nfs/inode.c +++ b/fs/nfs/inode.c @@ -703,7 +703,6 @@ static void nfs_init_lock_context(struct nfs_lock_context *l_ctx) { atomic_set(&l_ctx->count, 1); l_ctx->lockowner.l_owner = current->files; - l_ctx->lockowner.l_pid = current->tgid; INIT_LIST_HEAD(&l_ctx->list); atomic_set(&l_ctx->io_count, 0); } @@ -716,8 +715,6 @@ static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context do { if (pos->lockowner.l_owner != current->files) continue; - if (pos->lockowner.l_pid != current->tgid) - continue; atomic_inc(&pos->count); return pos; } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head); diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 0e327528a3ce..b7df3ef84fc3 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -2766,7 +2766,6 @@ static int _nfs4_do_setattr(struct inode *inode, } else if (truncate && state != NULL) { struct nfs_lockowner lockowner = { .l_owner = current->files, - .l_pid = current->tgid, }; if (!nfs4_valid_open_stateid(state)) return -EBADF; diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c index 965db474f4b0..161f8b13bbaa 100644 --- a/fs/nfs/pagelist.c +++ b/fs/nfs/pagelist.c @@ -867,8 +867,7 @@ static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio) static bool nfs_match_lock_context(const struct nfs_lock_context *l1, const struct nfs_lock_context *l2) { - return l1->lockowner.l_owner == l2->lockowner.l_owner - && l1->lockowner.l_pid == l2->lockowner.l_pid; + return l1->lockowner.l_owner == l2->lockowner.l_owner; } /** diff --git a/fs/nfs/write.c b/fs/nfs/write.c index 53211838f72a..4d5897e6d6cb 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1151,8 +1151,7 @@ int nfs_flush_incompatible(struct file *file, struct page *page) if (l_ctx && flctx && !(list_empty_careful(&flctx->flc_posix) && list_empty_careful(&flctx->flc_flock))) { - do_flush |= l_ctx->lockowner.l_owner != current->files - || l_ctx->lockowner.l_pid != current->tgid; + do_flush |= l_ctx->lockowner.l_owner != current->files; } nfs_release_request(req); if (!do_flush) diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 810124b33327..bf8a713c45b4 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -57,7 +57,6 @@ struct nfs_access_entry { struct nfs_lockowner { fl_owner_t l_owner; - pid_t l_pid; }; struct nfs_lock_context {