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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-02-13 09:21:38 -0500
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-02-20 15:14:20 -0500
commitf57dcf4c72113c745d83f1c65f7291299f65c14f (patch)
treec4a41e683e8eb2fc343a524b1a92d9e2421cda2f /fs/nfs
parent2137397c92aec3713fa10be3c9b830f9a1674e60 (diff)
downloadlinux-stericsson-f57dcf4c72113c745d83f1c65f7291299f65c14f.tar.gz
NFS: Fix I/O request leakages
When we fail to add the request to the I/O queue, we currently leave it to the caller to free the failed request. However since some of the requests that fail are actually created by nfs_pageio_add_request() itself, and are not passed back the caller, this leads to a leakage issue, which can again cause page locks to leak. This commit addresses the leakage by freeing the created requests on error, using desc->pg_completion_ops->error_cleanup() Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com> Fixes: a7d42ddb30997 ("nfs: add mirroring support to pgio layer") Cc: stable@vger.kernel.org # v4.0: c18b96a1b862: nfs: clean up rest of reqs Cc: stable@vger.kernel.org # v4.0: d600ad1f2bdb: NFS41: pop some layoutget Cc: stable@vger.kernel.org # v4.0+
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/pagelist.c26
1 files changed, 21 insertions, 5 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index e54d899c1848..301880a3ad8e 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -988,6 +988,17 @@ static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
}
}
+static void
+nfs_pageio_cleanup_request(struct nfs_pageio_descriptor *desc,
+ struct nfs_page *req)
+{
+ LIST_HEAD(head);
+
+ nfs_list_remove_request(req);
+ nfs_list_add_request(req, &head);
+ desc->pg_completion_ops->error_cleanup(&head);
+}
+
/**
* nfs_pageio_add_request - Attempt to coalesce a request into a page list.
* @desc: destination io descriptor
@@ -1025,10 +1036,8 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
nfs_page_group_unlock(req);
desc->pg_moreio = 1;
nfs_pageio_doio(desc);
- if (desc->pg_error < 0)
- return 0;
- if (mirror->pg_recoalesce)
- return 0;
+ if (desc->pg_error < 0 || mirror->pg_recoalesce)
+ goto out_cleanup_subreq;
/* retry add_request for this subreq */
nfs_page_group_lock(req);
continue;
@@ -1061,6 +1070,10 @@ err_ptr:
desc->pg_error = PTR_ERR(subreq);
nfs_page_group_unlock(req);
return 0;
+out_cleanup_subreq:
+ if (req != subreq)
+ nfs_pageio_cleanup_request(desc, subreq);
+ return 0;
}
static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
@@ -1168,11 +1181,14 @@ int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
if (nfs_pgio_has_mirroring(desc))
desc->pg_mirror_idx = midx;
if (!nfs_pageio_add_request_mirror(desc, dupreq))
- goto out_failed;
+ goto out_cleanup_subreq;
}
return 1;
+out_cleanup_subreq:
+ if (req != dupreq)
+ nfs_pageio_cleanup_request(desc, dupreq);
out_failed:
nfs_pageio_error_cleanup(desc);
return 0;