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| author | Peng Tao <tao.peng@primarydata.com> | 2014-11-05 22:36:50 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-11-21 09:22:53 -0800 |
| commit | 32049712c4d803139fecf7a59cfa3e24c8456d03 (patch) | |
| tree | 0952713e25a49a9d4241d458739edba68e23fc37 | |
| parent | 562e494829ef4d54cf9c6c0676038dac3e2917af (diff) | |
| download | lwn-32049712c4d803139fecf7a59cfa3e24c8456d03.tar.gz lwn-32049712c4d803139fecf7a59cfa3e24c8456d03.zip | |
nfs: fix pnfs direct write memory leak
commit 8c393f9a721c30a030049a680e1bf896669bb279 upstream.
For pNFS direct writes, layout driver may dynamically allocate ds_cinfo.buckets.
So we need to take care to free them when freeing dreq.
Ideally this needs to be done inside layout driver where ds_cinfo.buckets
are allocated. But buckets are attached to dreq and reused across LD IO iterations.
So I feel it's OK to free them in the generic layer.
Signed-off-by: Peng Tao <tao.peng@primarydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | fs/nfs/direct.c | 1 | ||||
| -rw-r--r-- | include/linux/nfs_xdr.h | 11 |
2 files changed, 12 insertions, 0 deletions
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 0bd7a55a5f07..725e87538c98 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -180,6 +180,7 @@ static void nfs_direct_req_free(struct kref *kref) { struct nfs_direct_req *dreq = container_of(kref, struct nfs_direct_req, kref); + nfs_free_pnfs_ds_cinfo(&dreq->ds_cinfo); if (dreq->l_ctx != NULL) nfs_put_lock_context(dreq->l_ctx); if (dreq->ctx != NULL) diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 104b62f23ee0..54e351aa4d2e 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -1184,11 +1184,22 @@ struct nfs41_free_stateid_res { unsigned int status; }; +static inline void +nfs_free_pnfs_ds_cinfo(struct pnfs_ds_commit_info *cinfo) +{ + kfree(cinfo->buckets); +} + #else struct pnfs_ds_commit_info { }; +static inline void +nfs_free_pnfs_ds_cinfo(struct pnfs_ds_commit_info *cinfo) +{ +} + #endif /* CONFIG_NFS_V4_1 */ struct nfs_page; |