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authorTrond Myklebust <trondmy@gmail.com>2019-04-07 20:59:08 +0300
committerAnna Schumaker <Anna.Schumaker@Netapp.com>2019-04-25 21:18:14 +0300
commit33344e0f7eaa2efbf9fcc55557d02e8603aa7012 (patch)
treed4d349e0fd2dfca232c8fc02b6d47ca1ac626caf /include/linux/nfs_page.h
parent28b1d3f5a772b705ca76df620eb9f686aa2d0b4c (diff)
downloadlinux-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.h4
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 */