On Aug 19, 2015, at 1:24 PM, Peng Tao <[email protected]> wrote:
> From: Trond Myklebust <[email protected]> > > pNFS writes don't return attributes, however that doesn't mean that we > should ignore the fact that they may be extending the file. This patch > ensures that if a write is seen to extend the file, then we always set > an attribute barrier, and update the cached file size. I think this is the same problem I see when a write delegation is in effect. The flush-after-close does not wait, and does not set an attribute barrier. So a subsequent append write starts at the wrong file length. > Signed-off-by: Trond Myklebust <[email protected]> > --- > Please apply this to 4.0+ stable releases. It is upstream commit > 2b83d3de4c18af49800e0b26ae013db4fcf43a4a. It fixes > a08a8cd375db9769588257e7782f6b6b68561b88(NFS: Add attribute update barriers > to NFS writebacks) > and makes sure we pass fstest read_write/mctime.t test with delegation and > inband IO. > Without it, users might see mtime not updated after write. > > Cheers, > Tao > > fs/nfs/write.c | 15 +++++++++------ > 1 file changed, 9 insertions(+), 6 deletions(-) > > diff --git a/fs/nfs/write.c b/fs/nfs/write.c > index 359e9ad..0e6a2b8 100644 > --- a/fs/nfs/write.c > +++ b/fs/nfs/write.c > @@ -1378,24 +1378,27 @@ static void nfs_writeback_check_extend(struct > nfs_pgio_header *hdr, > { > struct nfs_pgio_args *argp = &hdr->args; > struct nfs_pgio_res *resp = &hdr->res; > + u64 size = argp->offset + resp->count; > > if (!(fattr->valid & NFS_ATTR_FATTR_SIZE)) > + fattr->size = size; > + if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) { > + fattr->valid &= ~NFS_ATTR_FATTR_SIZE; > return; > - if (argp->offset + resp->count != fattr->size) > - return; > - if (nfs_size_to_loff_t(fattr->size) < i_size_read(hdr->inode)) > + } > + if (size != fattr->size) > return; > /* Set attribute barrier */ > nfs_fattr_set_barrier(fattr); > + /* ...and update size */ > + fattr->valid |= NFS_ATTR_FATTR_SIZE; > } > > void nfs_writeback_update_inode(struct nfs_pgio_header *hdr) > { > - struct nfs_fattr *fattr = hdr->res.fattr; > + struct nfs_fattr *fattr = &hdr->fattr; > struct inode *inode = hdr->inode; > > - if (fattr == NULL) > - return; > spin_lock(&inode->i_lock); > nfs_writeback_check_extend(hdr, fattr); > nfs_post_op_update_inode_force_wcc_locked(inode, fattr); > -- > 1.8.3.1 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Chuck Lever -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
