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| author | Trond Myklebust <trondmy@gmail.com> | 2019-04-07 20:59:08 +0300 |
|---|---|---|
| committer | Anna Schumaker <Anna.Schumaker@Netapp.com> | 2019-04-25 21:18:14 +0300 |
| commit | 33344e0f7eaa2efbf9fcc55557d02e8603aa7012 (patch) | |
| tree | d4d349e0fd2dfca232c8fc02b6d47ca1ac626caf /fs/nfs/write.c | |
| parent | 28b1d3f5a772b705ca76df620eb9f686aa2d0b4c (diff) | |
| download | linux-33344e0f7eaa2efbf9fcc55557d02e8603aa7012.tar.xz | |
pNFS: Add tracking to limit the number of pNFS retries
When the client is reading or writing using pNFS, and hits an error
on the DS, then it typically sends a LAYOUTERROR and/or LAYOUTRETURN
to the MDS, before redirtying the failed pages, and going for a new
round of reads/writebacks. The problem is that if the server has no
way to fix the DS, then we may need a way to interrupt this loop
after a set number of attempts have been made.
This patch adds an optional module parameter that allows the admin
to specify how many times to retry the read/writeback process before
failing with a fatal error.
The default behaviour is to retry forever.
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Diffstat (limited to 'fs/nfs/write.c')
| -rw-r--r-- | fs/nfs/write.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/nfs/write.c b/fs/nfs/write.c index b9bcbd06a628..294604784f70 100644 --- a/fs/nfs/write.c +++ b/fs/nfs/write.c @@ -1009,6 +1009,8 @@ static void nfs_write_completion(struct nfs_pgio_header *hdr) goto remove_req; } if (nfs_write_need_commit(hdr)) { + /* Reset wb_nio, since the write was successful. */ + req->wb_nio = 0; memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf)); nfs_mark_request_commit(req, hdr->lseg, &cinfo, hdr->pgio_mirror_idx); @@ -1142,6 +1144,7 @@ static struct nfs_page *nfs_try_to_update_request(struct inode *inode, req->wb_bytes = end - req->wb_offset; else req->wb_bytes = rqend - req->wb_offset; + req->wb_nio = 0; return req; out_flushme: /* @@ -1416,6 +1419,8 @@ static void nfs_initiate_write(struct nfs_pgio_header *hdr, */ static void nfs_redirty_request(struct nfs_page *req) { + /* Bump the transmission count */ + req->wb_nio++; nfs_mark_request_dirty(req); set_bit(NFS_CONTEXT_RESEND_WRITES, &req->wb_context->flags); nfs_end_page_writeback(req); |