diff options
| 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 /include/linux/nfs_page.h | |
| 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 'include/linux/nfs_page.h')
| -rw-r--r-- | include/linux/nfs_page.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h index b7d0f15615c2..8b36800d342d 100644 --- a/include/linux/nfs_page.h +++ b/include/linux/nfs_page.h @@ -53,6 +53,7 @@ struct nfs_page { struct nfs_write_verifier wb_verf; /* Commit cookie */ struct nfs_page *wb_this_page; /* list of reqs for this page */ struct nfs_page *wb_head; /* head pointer for req list */ + unsigned short wb_nio; /* Number of I/O attempts */ }; struct nfs_pageio_descriptor; @@ -87,7 +88,6 @@ struct nfs_pgio_mirror { }; struct nfs_pageio_descriptor { - unsigned char pg_moreio : 1; struct inode *pg_inode; const struct nfs_pageio_ops *pg_ops; const struct nfs_rw_ops *pg_rw_ops; @@ -105,6 +105,8 @@ struct nfs_pageio_descriptor { struct nfs_pgio_mirror pg_mirrors_static[1]; struct nfs_pgio_mirror *pg_mirrors_dynamic; u32 pg_mirror_idx; /* current mirror */ + unsigned short pg_maxretrans; + unsigned char pg_moreio : 1; }; /* arbitrarily selected limit to number of mirrors */ |