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authorTrond Myklebust <trond.myklebust@hammerspace.com>2021-01-06 19:54:57 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2021-01-10 21:32:52 +0300
commit46c9ea1d4fee4cf1f8cc6001b9c14aae61b3d502 (patch)
tree8f0287d8612116558e0684281057f9af955c039d /fs
parent1757655d780d9d29bc4b60e708342e94924f7ef3 (diff)
downloadlinux-46c9ea1d4fee4cf1f8cc6001b9c14aae61b3d502.tar.xz
NFS/pNFS: Don't leak DS commits in pnfs_generic_retry_commit()
We must ensure that we pass a layout segment to nfs_retry_commit() when we're cleaning up after pnfs_bucket_alloc_ds_commits(). Otherwise, requests that should be committed to the DS will get committed to the MDS. Do so by ensuring that pnfs_bucket_get_committing() always tries to return a layout segment when it returns a non-empty page list. Fixes: c84bea59449a ("NFS/pNFS: Simplify bucket layout segment reference counting") Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/pnfs_nfs.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/fs/nfs/pnfs_nfs.c b/fs/nfs/pnfs_nfs.c
index df20bbe8d15e..49d3389bd813 100644
--- a/fs/nfs/pnfs_nfs.c
+++ b/fs/nfs/pnfs_nfs.c
@@ -403,12 +403,16 @@ pnfs_bucket_get_committing(struct list_head *head,
struct pnfs_commit_bucket *bucket,
struct nfs_commit_info *cinfo)
{
+ struct pnfs_layout_segment *lseg;
struct list_head *pos;
list_for_each(pos, &bucket->committing)
cinfo->ds->ncommitting--;
list_splice_init(&bucket->committing, head);
- return pnfs_free_bucket_lseg(bucket);
+ lseg = pnfs_free_bucket_lseg(bucket);
+ if (!lseg)
+ lseg = pnfs_get_lseg(bucket->lseg);
+ return lseg;
}
static struct nfs_commit_data *
@@ -420,8 +424,6 @@ pnfs_bucket_fetch_commitdata(struct pnfs_commit_bucket *bucket,
if (!data)
return NULL;
data->lseg = pnfs_bucket_get_committing(&data->pages, bucket, cinfo);
- if (!data->lseg)
- data->lseg = pnfs_get_lseg(bucket->lseg);
return data;
}