xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

pNFS/flexfiles: Don't tie up all the rpciod threads in resends

Browse Source 
We do not want to have rpciod threads perform recursive calls into the
RPC layer since that can deadlock. In particular, having to wait for
a layoutget can be nasty... We want rather to defer scheduling those
retries until we're in the rpc_release() callback, since that is
called from the nfsiod workqueue.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust
2018-06-18 19:07:24 -04:00
parent 0dae72d581
commit 42f86b44a4
2 changed files with 10 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

11
fs/nfs/flexfilelayout/flexfilelayout.c
View File

@@ -1243,17 +1243,18 @@ static int ff_layout_read_done_cb(struct rpc_task *task,
hdr->ds_clp, hdr->lseg,
hdr->pgio_mirror_idx);
clear_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
clear_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
switch (err) {
case -NFS4ERR_RESET_TO_PNFS:
if (ff_layout_choose_best_ds_for_read(hdr->lseg,
hdr->pgio_mirror_idx + 1,
&hdr->pgio_mirror_idx))
goto out_eagain;
ff_layout_read_record_layoutstats_done(task, hdr);
pnfs_read_resend_pnfs(hdr);
set_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags);
return task->tk_status;
case -NFS4ERR_RESET_TO_MDS:
ff_layout_reset_read(hdr);
set_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags);
return task->tk_status;
case -EAGAIN:
goto out_eagain;
@@ -1403,6 +1404,10 @@ static void ff_layout_read_release(void *data)
struct nfs_pgio_header *hdr = data;
ff_layout_read_record_layoutstats_done(&hdr->task, hdr);
if (test_bit(NFS_IOHDR_RESEND_PNFS, &hdr->flags))
pnfs_read_resend_pnfs(hdr);
else if (test_bit(NFS_IOHDR_RESEND_MDS, &hdr->flags))
ff_layout_reset_read(hdr);
pnfs_generic_rw_release(data);
}