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nfs: remove pgio_header refcount, related cleanup

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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>
This commit is contained in:
Weston Andros Adamson 2014-06-09 11:48:37 -04:00 committed by Trond Myklebust
parent c65e6254ca
commit 4714fb51fd
3 changed files with 11 additions and 32 deletions
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36
fs/nfs/pagelist.c
View file

@ -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;
}

6
fs/nfs/pnfs.c
View file

@ -1602,15 +1602,12 @@ pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
}
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_pageio_descriptor *desc)
}
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);

1
include/linux/nfs_xdr.h
View file

@ -1259,7 +1259,6 @@ 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;