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NFS/pNFS: Don't leak DS commits in pnfs_generic_retry_commit()

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commit 46c9ea1d4fee4cf1f8cc6001b9c14aae61b3d502 upstream.

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: c84bea5944 ("NFS/pNFS: Simplify bucket layout segment reference counting")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Trond Myklebust 2021-01-06 11:54:57 -05:00 committed by Greg Kroah-Hartman
parent 067aefcdfc
commit b666f394d6
1 changed files with 5 additions and 3 deletions
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8
fs/nfs/pnfs_nfs.c
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@ -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;
}