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authorWeston Andros Adamson <dros@primarydata.com>2014-06-09 19:48:37 +0400
committerTrond Myklebust <trond.myklebust@primarydata.com>2014-06-25 02:47:01 +0400
commit4714fb51fd03a14d8c73001438283e7f7b752f1e (patch)
treecb138e6479fb7a4fc4109f440b4138e2e00369ee /fs/nfs/pagelist.c
parentc65e6254ca4db1584c5bf5f228ee26556477a9fd (diff)
downloadlinux-4714fb51fd03a14d8c73001438283e7f7b752f1e.tar.xz
nfs: remove pgio_header refcount, related cleanup
The refcounting on nfs_pgio_header was related to there being (possibly) more than one nfs_pgio_data. Now that nfs_pgio_data has been merged into nfs_pgio_header, there is no reason to do this ref counting. Just call the completion callback on nfs_pgio_release/nfs_pgio_error. Signed-off-by: Weston Andros Adamson <dros@primarydata.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/pagelist.c')
-rw-r--r--fs/nfs/pagelist.c36
1 files changed, 11 insertions, 25 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 7dd0d5f101a4..580fc0c982e6 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -459,7 +459,6 @@ struct nfs_pgio_header *nfs_pgio_header_alloc(const struct nfs_rw_ops *ops)
if (hdr) {
INIT_LIST_HEAD(&hdr->pages);
spin_lock_init(&hdr->lock);
- atomic_set(&hdr->refcnt, 0);
hdr->rw_ops = ops;
}
return hdr;
@@ -477,31 +476,18 @@ void nfs_pgio_header_free(struct nfs_pgio_header *hdr)
EXPORT_SYMBOL_GPL(nfs_pgio_header_free);
/**
- * nfs_pgio_data_alloc - Allocate pageio data
- * @hdr: The header making a request
- * @pagecount: Number of pages to create
- */
-static bool nfs_pgio_data_init(struct nfs_pgio_header *hdr,
- unsigned int pagecount)
-{
- if (nfs_pgarray_set(&hdr->page_array, pagecount)) {
- atomic_inc(&hdr->refcnt);
- return true;
- }
- return false;
-}
-
-/**
- * nfs_pgio_data_destroy - Properly release pageio data
- * @hdr: The header with data to destroy
+ * nfs_pgio_data_destroy - make @hdr suitable for reuse
+ *
+ * Frees memory and releases refs from nfs_generic_pgio, so that it may
+ * be called again.
+ *
+ * @hdr: A header that has had nfs_generic_pgio called
*/
void nfs_pgio_data_destroy(struct nfs_pgio_header *hdr)
{
put_nfs_open_context(hdr->args.context);
if (hdr->page_array.pagevec != hdr->page_array.page_array)
kfree(hdr->page_array.pagevec);
- if (atomic_dec_and_test(&hdr->refcnt))
- hdr->completion_ops->completion(hdr);
}
EXPORT_SYMBOL_GPL(nfs_pgio_data_destroy);
@@ -620,6 +606,7 @@ static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
{
set_bit(NFS_IOHDR_REDO, &hdr->flags);
nfs_pgio_data_destroy(hdr);
+ hdr->completion_ops->completion(hdr);
desc->pg_completion_ops->error_cleanup(&desc->pg_list);
return -ENOMEM;
}
@@ -634,6 +621,7 @@ static void nfs_pgio_release(void *calldata)
if (hdr->rw_ops->rw_release)
hdr->rw_ops->rw_release(hdr);
nfs_pgio_data_destroy(hdr);
+ hdr->completion_ops->completion(hdr);
}
/**
@@ -707,9 +695,10 @@ int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
struct page **pages;
struct list_head *head = &desc->pg_list;
struct nfs_commit_info cinfo;
+ unsigned int pagecount;
- if (!nfs_pgio_data_init(hdr, nfs_page_array_len(desc->pg_base,
- desc->pg_count)))
+ pagecount = nfs_page_array_len(desc->pg_base, desc->pg_count);
+ if (!nfs_pgarray_set(&hdr->page_array, pagecount))
return nfs_pgio_error(desc, hdr);
nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
@@ -743,14 +732,11 @@ static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
return -ENOMEM;
}
nfs_pgheader_init(desc, hdr, nfs_pgio_header_free);
- atomic_inc(&hdr->refcnt);
ret = nfs_generic_pgio(desc, hdr);
if (ret == 0)
ret = nfs_initiate_pgio(NFS_CLIENT(hdr->inode),
hdr, desc->pg_rpc_callops,
desc->pg_ioflags, 0);
- if (atomic_dec_and_test(&hdr->refcnt))
- hdr->completion_ops->completion(hdr);
return ret;
}