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Date: Fri, 3 Oct 2014 14:29:09 -0700
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Weston Andros Adamson <dros@...marydata.com>,
Trond Myklebust <trond.myklebust@...marydata.com>
Subject: [PATCH 3.16 163/357] nfs: remove pgio_header refcount, related cleanup
3.16-stable review patch. If anyone has any objections, please let me know.
------------------
From: Weston Andros Adamson <dros@...marydata.com>
commit 4714fb51fd03a14d8c73001438283e7f7b752f1e upstream.
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@...marydata.com>
Signed-off-by: Trond Myklebust <trond.myklebust@...marydata.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/nfs/pagelist.c | 36 +++++++++++-------------------------
fs/nfs/pnfs.c | 6 ------
include/linux/nfs_xdr.h | 1 -
3 files changed, 11 insertions(+), 32 deletions(-)
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -469,7 +469,6 @@ struct nfs_pgio_header *nfs_pgio_header_
if (hdr) {
INIT_LIST_HEAD(&hdr->pages);
spin_lock_init(&hdr->lock);
- atomic_set(&hdr->refcnt, 0);
hdr->rw_ops = ops;
}
return hdr;
@@ -487,31 +486,18 @@ void nfs_pgio_header_free(struct nfs_pgi
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);
@@ -630,6 +616,7 @@ static int nfs_pgio_error(struct nfs_pag
{
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;
}
@@ -644,6 +631,7 @@ static void nfs_pgio_release(void *calld
if (hdr->rw_ops->rw_release)
hdr->rw_ops->rw_release(hdr);
nfs_pgio_data_destroy(hdr);
+ hdr->completion_ops->completion(hdr);
}
/**
@@ -717,9 +705,10 @@ int nfs_generic_pgio(struct nfs_pageio_d
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);
@@ -753,14 +742,11 @@ static int nfs_generic_pg_pgios(struct n
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;
}
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1602,15 +1602,12 @@ pnfs_generic_pg_writepages(struct nfs_pa
}
nfs_pgheader_init(desc, hdr, pnfs_writehdr_free);
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
- atomic_inc(&hdr->refcnt);
ret = nfs_generic_pgio(desc, hdr);
if (ret != 0) {
pnfs_put_lseg(desc->pg_lseg);
desc->pg_lseg = NULL;
} else
pnfs_do_write(desc, hdr, desc->pg_ioflags);
- if (atomic_dec_and_test(&hdr->refcnt))
- hdr->completion_ops->completion(hdr);
return ret;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_writepages);
@@ -1745,15 +1742,12 @@ pnfs_generic_pg_readpages(struct nfs_pag
}
nfs_pgheader_init(desc, hdr, pnfs_readhdr_free);
hdr->lseg = pnfs_get_lseg(desc->pg_lseg);
- atomic_inc(&hdr->refcnt);
ret = nfs_generic_pgio(desc, hdr);
if (ret != 0) {
pnfs_put_lseg(desc->pg_lseg);
desc->pg_lseg = NULL;
} else
pnfs_do_read(desc, hdr);
- if (atomic_dec_and_test(&hdr->refcnt))
- hdr->completion_ops->completion(hdr);
return ret;
}
EXPORT_SYMBOL_GPL(pnfs_generic_pg_readpages);
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1261,7 +1261,6 @@ struct nfs_pgio_header {
struct inode *inode;
struct rpc_cred *cred;
struct list_head pages;
- atomic_t refcnt;
struct nfs_page *req;
struct nfs_writeverf verf; /* Used for writes */
struct pnfs_layout_segment *lseg;
--
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