From: Peng Tao Date: Fri, 12 Sep 2014 03:04:10 +0000 (+0800) Subject: nfs41: change PNFS_LAYOUTRET_ON_SETATTR to only return on truncation to smaller size X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=88ac815cdbef93dec8382b3531ef90474dd102f2;p=deliverable%2Flinux.git nfs41: change PNFS_LAYOUTRET_ON_SETATTR to only return on truncation to smaller size Both blocks layout and objects layout want to use it to avoid CB_LAYOUTRECALL but that should only happen if client is doing truncation to a smaller size. For other cases, we let server decide if it wants to recall client's layouts. Change PNFS_LAYOUTRET_ON_SETATTR to follow the logic and not to send layoutreturn unnecessarily. Cc: Christoph Hellwig Cc: Boaz Harrosh Signed-off-by: Peng Tao Signed-off-by: Trond Myklebust --- diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index 0b711227cfa5..288be08bda95 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -3211,7 +3211,9 @@ nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr, struct nfs4_label *label = NULL; int status; - if (pnfs_ld_layoutret_on_setattr(inode)) + if (pnfs_ld_layoutret_on_setattr(inode) && + sattr->ia_valid & ATTR_SIZE && + sattr->ia_size < i_size_read(inode)) pnfs_commit_and_return_layout(inode); nfs_fattr_init(fattr); diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h index b10f12fc6818..693ce42ec683 100644 --- a/fs/nfs/pnfs.h +++ b/fs/nfs/pnfs.h @@ -69,7 +69,8 @@ enum { }; enum layoutdriver_policy_flags { - /* Should the pNFS client commit and return the layout upon a setattr */ + /* Should the pNFS client commit and return the layout upon truncate to + * a smaller size */ PNFS_LAYOUTRET_ON_SETATTR = 1 << 0, PNFS_LAYOUTRET_ON_ERROR = 1 << 1, PNFS_READ_WHOLE_PAGE = 1 << 2,