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pNFS: Files and flexfiles always need to commit before layoutcommit

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So ensure that we mark the layout for commit once the write is done,
and then ensure that the commit to ds is finished before sending
layoutcommit.

Note that by doing this, we're able to optimise away the commit
for the case of servers that don't need layoutcommit in order to
return updated attributes.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-06-26 18:54:58 -04:00
parent bc28e1c2e3
commit 2e18d4d822
5 changed files with 30 additions and 9 deletions
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9
fs/nfs/filelayout/filelayout.c
View File

@ -255,13 +255,16 @@ static int filelayout_read_done_cb(struct rpc_task *task,
static void
filelayout_set_layoutcommit(struct nfs_pgio_header *hdr)
{
loff_t end_offs = 0;
if (FILELAYOUT_LSEG(hdr->lseg)->commit_through_mds ||
hdr->res.verf->committed != NFS_DATA_SYNC)
hdr->res.verf->committed == NFS_FILE_SYNC)
return;
if (hdr->res.verf->committed == NFS_DATA_SYNC)
end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
pnfs_set_layoutcommit(hdr->inode, hdr->lseg,
hdr->mds_offset + hdr->res.count);
/* Note: if the write is unstable, don't set end_offs until commit */
pnfs_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
dprintk("%s inode %lu pls_end_pos %lu\n", __func__, hdr->inode->i_ino,
(unsigned long) NFS_I(hdr->inode)->layout->plh_lwb);
}

7
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@ -1470,6 +1470,7 @@ static void ff_layout_read_release(void *data)
static int ff_layout_write_done_cb(struct rpc_task *task,
struct nfs_pgio_header *hdr)
{
loff_t end_offs = 0;
int err;
trace_nfs4_pnfs_write(hdr, task->tk_status);
@ -1495,8 +1496,10 @@ static int ff_layout_write_done_cb(struct rpc_task *task,
if (hdr->res.verf->committed == NFS_FILE_SYNC ||
hdr->res.verf->committed == NFS_DATA_SYNC)
ff_layout_set_layoutcommit(hdr->inode, hdr->lseg,
hdr->mds_offset + (loff_t)hdr->res.count);
end_offs = hdr->mds_offset + (loff_t)hdr->res.count;
/* Note: if the write is unstable, don't set end_offs until commit */
ff_layout_set_layoutcommit(hdr->inode, hdr->lseg, end_offs);
/* zero out fattr since we don't care DS attr at all */
hdr->fattr.valid = 0;

11
fs/nfs/nfs4xdr.c
View File

@ -1985,9 +1985,14 @@ encode_layoutcommit(struct xdr_stream *xdr,
p = xdr_encode_hyper(p, args->lastbytewritten + 1); /* length */
*p = cpu_to_be32(0); /* reclaim */
encode_nfs4_stateid(xdr, &args->stateid);
p = reserve_space(xdr, 20);
*p++ = cpu_to_be32(1); /* newoffset = TRUE */
p = xdr_encode_hyper(p, args->lastbytewritten);
if (args->lastbytewritten != U64_MAX) {
p = reserve_space(xdr, 20);
*p++ = cpu_to_be32(1); /* newoffset = TRUE */
p = xdr_encode_hyper(p, args->lastbytewritten);
} else {
p = reserve_space(xdr, 12);
*p++ = cpu_to_be32(0); /* newoffset = FALSE */
}
*p++ = cpu_to_be32(0); /* Never send time_modify_changed */
*p++ = cpu_to_be32(NFS_SERVER(args->inode)->pnfs_curr_ld->id);/* type */

5
fs/nfs/pnfs.c
View File

@ -2378,7 +2378,10 @@ pnfs_layoutcommit_inode(struct inode *inode, bool sync)
nfs_fattr_init(&data->fattr);
data->args.bitmask = NFS_SERVER(inode)->cache_consistency_bitmask;
data->res.fattr = &data->fattr;
data->args.lastbytewritten = end_pos - 1;
if (end_pos != 0)
data->args.lastbytewritten = end_pos - 1;
else
data->args.lastbytewritten = U64_MAX;
data->res.server = NFS_SERVER(inode);
if (ld->prepare_layoutcommit) {

7
fs/nfs/pnfs_nfs.c
View File

@ -932,6 +932,13 @@ EXPORT_SYMBOL_GPL(pnfs_layout_mark_request_commit);
int
pnfs_nfs_generic_sync(struct inode *inode, bool datasync)
{
int ret;
if (!pnfs_layoutcommit_outstanding(inode))
return 0;
ret = nfs_commit_inode(inode, FLUSH_SYNC);
if (ret < 0)
return ret;
if (datasync)
return 0;
return pnfs_layoutcommit_inode(inode, true);