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NFS: create struct nfs_page_array

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Both nfs_read_data and nfs_write_data devote several fields which
can be combined into a single shared struct.

Signed-off-by: Fred Isaman <iisaman@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Fred Isaman 2012-04-20 14:47:45 -04:00 committed by Trond Myklebust
parent cd841605f7
commit 30dd374f6f
7 changed files with 67 additions and 56 deletions
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11
fs/nfs/blocklayout/blocklayout.c
View File

@ -242,7 +242,7 @@ bl_read_pagelist(struct nfs_read_data *rdata)
int pg_index = rdata->args.pgbase >> PAGE_CACHE_SHIFT;
dprintk("%s enter nr_pages %u offset %lld count %u\n", __func__,
rdata->npages, f_offset, (unsigned int)rdata->args.count);
rdata->pages.npages, f_offset, (unsigned int)rdata->args.count);
par = alloc_parallel(rdata);
if (!par)
@ -252,7 +252,7 @@ bl_read_pagelist(struct nfs_read_data *rdata)
isect = (sector_t) (f_offset >> SECTOR_SHIFT);
/* Code assumes extents are page-aligned */
for (i = pg_index; i < rdata->npages; i++) {
for (i = pg_index; i < rdata->pages.npages; i++) {
if (!extent_length) {
/* We've used up the previous extent */
bl_put_extent(be);
@ -285,7 +285,8 @@ bl_read_pagelist(struct nfs_read_data *rdata)
struct pnfs_block_extent *be_read;
be_read = (hole && cow_read) ? cow_read : be;
bio = bl_add_page_to_bio(bio, rdata->npages - i, READ,
bio = bl_add_page_to_bio(bio, rdata->pages.npages - i,
READ,
isect, pages[i], be_read,
bl_end_io_read, par);
if (IS_ERR(bio)) {
@ -654,7 +655,7 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
/* Middle pages */
pg_index = wdata->args.pgbase >> PAGE_CACHE_SHIFT;
for (i = pg_index; i < wdata->npages; i++) {
for (i = pg_index; i < wdata->pages.npages; i++) {
if (!extent_length) {
/* We've used up the previous extent */
bl_put_extent(be);
@ -688,7 +689,7 @@ bl_write_pagelist(struct nfs_write_data *wdata, int sync)
goto out;
}
}
bio = bl_add_page_to_bio(bio, wdata->npages - i, WRITE,
bio = bl_add_page_to_bio(bio, wdata->pages.npages - i, WRITE,
isect, pages[i], be,
bl_end_io_write, par);
if (IS_ERR(bio)) {

40
fs/nfs/direct.c
View File

@ -252,11 +252,11 @@ static void nfs_direct_read_release(void *calldata)
} else {
dreq->count += data->res.count;
spin_unlock(&dreq->lock);
nfs_direct_dirty_pages(data->pagevec,
nfs_direct_dirty_pages(data->pages.pagevec,
data->args.pgbase,
data->res.count);
}
nfs_direct_release_pages(data->pagevec, data->npages);
nfs_direct_release_pages(data->pages.pagevec, data->pages.npages);
if (put_dreq(dreq))
nfs_direct_complete(dreq);
@ -273,8 +273,8 @@ static void nfs_direct_readhdr_release(struct nfs_read_header *rhdr)
{
struct nfs_read_data *data = &rhdr->rpc_data;
if (data->pagevec != data->page_array)
kfree(data->pagevec);
if (data->pages.pagevec != data->pages.page_array)
kfree(data->pages.pagevec);
nfs_readhdr_free(&rhdr->header);
}
@ -312,6 +312,7 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
do {
struct nfs_read_header *rhdr;
struct nfs_read_data *data;
struct nfs_page_array *pages;
size_t bytes;
pgbase = user_addr & ~PAGE_MASK;
@ -322,24 +323,25 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
if (unlikely(!rhdr))
break;
data = &rhdr->rpc_data;
pages = &data->pages;
down_read(&current->mm->mmap_sem);
result = get_user_pages(current, current->mm, user_addr,
data->npages, 1, 0, data->pagevec, NULL);
pages->npages, 1, 0, pages->pagevec, NULL);
up_read(&current->mm->mmap_sem);
if (result < 0) {
nfs_direct_readhdr_release(rhdr);
break;
}
if ((unsigned)result < data->npages) {
if ((unsigned)result < pages->npages) {
bytes = result * PAGE_SIZE;
if (bytes <= pgbase) {
nfs_direct_release_pages(data->pagevec, result);
nfs_direct_release_pages(pages->pagevec, result);
nfs_direct_readhdr_release(rhdr);
break;
}
bytes -= pgbase;
data->npages = result;
pages->npages = result;
}
get_dreq(dreq);
@ -352,7 +354,7 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_direct_req *dreq,
data->args.lock_context = dreq->l_ctx;
data->args.offset = pos;
data->args.pgbase = pgbase;
data->args.pages = data->pagevec;
data->args.pages = pages->pagevec;
data->args.count = bytes;
data->res.fattr = &data->fattr;
data->res.eof = 0;
@ -462,8 +464,8 @@ static void nfs_direct_writehdr_release(struct nfs_write_header *whdr)
{
struct nfs_write_data *data = &whdr->rpc_data;
if (data->pagevec != data->page_array)
kfree(data->pagevec);
if (data->pages.pagevec != data->pages.page_array)
kfree(data->pages.pagevec);
nfs_writehdr_free(&whdr->header);
}
@ -472,8 +474,10 @@ static void nfs_direct_free_writedata(struct nfs_direct_req *dreq)
while (!list_empty(&dreq->rewrite_list)) {
struct nfs_pgio_header *hdr = list_entry(dreq->rewrite_list.next, struct nfs_pgio_header, pages);
struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
struct nfs_page_array *p = &whdr->rpc_data.pages;
list_del(&hdr->pages);
nfs_direct_release_pages(whdr->rpc_data.pagevec, whdr->rpc_data.npages);
nfs_direct_release_pages(p->pagevec, p->npages);
nfs_direct_writehdr_release(whdr);
}
}
@ -751,6 +755,7 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
do {
struct nfs_write_header *whdr;
struct nfs_write_data *data;
struct nfs_page_array *pages;
size_t bytes;
pgbase = user_addr & ~PAGE_MASK;
@ -762,24 +767,25 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
break;
data = &whdr->rpc_data;
pages = &data->pages;
down_read(&current->mm->mmap_sem);
result = get_user_pages(current, current->mm, user_addr,
data->npages, 0, 0, data->pagevec, NULL);
pages->npages, 0, 0, pages->pagevec, NULL);
up_read(&current->mm->mmap_sem);
if (result < 0) {
nfs_direct_writehdr_release(whdr);
break;
}
if ((unsigned)result < data->npages) {
if ((unsigned)result < pages->npages) {
bytes = result * PAGE_SIZE;
if (bytes <= pgbase) {
nfs_direct_release_pages(data->pagevec, result);
nfs_direct_release_pages(pages->pagevec, result);
nfs_direct_writehdr_release(whdr);
break;
}
bytes -= pgbase;
data->npages = result;
pages->npages = result;
}
get_dreq(dreq);
@ -794,7 +800,7 @@ static ssize_t nfs_direct_write_schedule_segment(struct nfs_direct_req *dreq,
data->args.lock_context = dreq->l_ctx;
data->args.offset = pos;
data->args.pgbase = pgbase;
data->args.pages = data->pagevec;
data->args.pages = pages->pagevec;
data->args.count = bytes;
data->args.stable = sync;
data->res.fattr = &data->fattr;

1
fs/nfs/internal.h
View File

@ -210,6 +210,7 @@ extern void nfs_destroy_writepagecache(void);
extern int __init nfs_init_directcache(void);
extern void nfs_destroy_directcache(void);
extern bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount);
/* nfs2xdr.c */
extern int nfs_stat_to_errno(enum nfs_stat);

13
fs/nfs/pagelist.c
View File

@ -26,6 +26,19 @@
static struct kmem_cache *nfs_page_cachep;
bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
{
p->npages = pagecount;
if (pagecount <= ARRAY_SIZE(p->page_array))
p->pagevec = p->page_array;
else {
p->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
if (!p->pagevec)
p->npages = 0;
}
return p->pagevec != NULL;
}
static inline struct nfs_page *
nfs_page_alloc(void)
{

18
fs/nfs/read.c
View File

@ -46,18 +46,12 @@ struct nfs_read_header *nfs_readhdr_alloc(unsigned int pagecount)
INIT_LIST_HEAD(&hdr->pages);
INIT_LIST_HEAD(&data->list);
data->npages = pagecount;
data->header = hdr;
if (pagecount <= ARRAY_SIZE(data->page_array))
data->pagevec = data->page_array;
else {
data->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_KERNEL);
if (!data->pagevec) {
if (!nfs_pgarray_set(&data->pages, pagecount)) {
kmem_cache_free(nfs_rdata_cachep, p);
p = NULL;
}
}
}
return p;
}
@ -71,8 +65,8 @@ void nfs_readhdr_free(struct nfs_pgio_header *hdr)
void nfs_readdata_release(struct nfs_read_data *rdata)
{
put_nfs_open_context(rdata->args.context);
if (rdata->pagevec != rdata->page_array)
kfree(rdata->pagevec);
if (rdata->pages.pagevec != rdata->pages.page_array)
kfree(rdata->pages.pagevec);
nfs_readhdr_free(rdata->header);
}
@ -232,7 +226,7 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
data->args.fh = NFS_FH(inode);
data->args.offset = req_offset(req) + offset;
data->args.pgbase = req->wb_pgbase + offset;
data->args.pages = data->pagevec;
data->args.pages = data->pages.pagevec;
data->args.count = count;
data->args.context = get_nfs_open_context(req->wb_context);
data->args.lock_context = req->wb_lock_context;
@ -318,7 +312,7 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc, struct list_head
if (!rhdr)
goto out_bad;
data = &rhdr->rpc_data;
data->pagevec[0] = page;
data->pages.pagevec[0] = page;
nfs_read_rpcsetup(req, data, len, offset);
list_add(&data->list, res);
requests++;
@ -356,7 +350,7 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc, struct list_head *
}
data = &rhdr->rpc_data;
pages = data->pagevec;
pages = data->pages.pagevec;
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);

18
fs/nfs/write.c
View File

@ -80,18 +80,12 @@ struct nfs_write_header *nfs_writehdr_alloc(unsigned int pagecount)
memset(p, 0, sizeof(*p));
INIT_LIST_HEAD(&hdr->pages);
INIT_LIST_HEAD(&data->list);
data->npages = pagecount;
data->header = hdr;
if (pagecount <= ARRAY_SIZE(data->page_array))
data->pagevec = data->page_array;
else {
data->pagevec = kcalloc(pagecount, sizeof(struct page *), GFP_NOFS);
if (!data->pagevec) {
if (!nfs_pgarray_set(&data->pages, pagecount)) {
mempool_free(p, nfs_wdata_mempool);
p = NULL;
}
}
}
return p;
}
@ -104,8 +98,8 @@ void nfs_writehdr_free(struct nfs_pgio_header *hdr)
void nfs_writedata_release(struct nfs_write_data *wdata)
{
put_nfs_open_context(wdata->args.context);
if (wdata->pagevec != wdata->page_array)
kfree(wdata->pagevec);
if (wdata->pages.pagevec != wdata->pages.page_array)
kfree(wdata->pages.pagevec);
nfs_writehdr_free(wdata->header);
}
@ -916,7 +910,7 @@ static void nfs_write_rpcsetup(struct nfs_page *req,
/* pnfs_set_layoutcommit needs this */
data->mds_offset = data->args.offset;
data->args.pgbase = req->wb_pgbase + offset;
data->args.pages = data->pagevec;
data->args.pages = data->pages.pagevec;
data->args.count = count;
data->args.context = get_nfs_open_context(req->wb_context);
data->args.lock_context = req->wb_lock_context;
@ -1011,7 +1005,7 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc, struct list_head
if (!whdr)
goto out_bad;
data = &whdr->rpc_data;
data->pagevec[0] = page;
data->pages.pagevec[0] = page;
nfs_write_rpcsetup(req, data, len, offset, desc->pg_ioflags);
list_add(&data->list, res);
requests++;
@ -1061,7 +1055,7 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc, struct list_head *r
goto out;
}
data = &whdr->rpc_data;
pages = data->pagevec;
pages = data->pages.pagevec;
while (!list_empty(head)) {
req = nfs_list_entry(head->next);
nfs_list_remove_request(req);

14
include/linux/nfs_xdr.h
View File

@ -1167,19 +1167,23 @@ struct nfs_page;
#define NFS_PAGEVEC_SIZE (8U)
struct nfs_page_array {
struct page **pagevec;
unsigned int npages; /* Max length of pagevec */
struct page *page_array[NFS_PAGEVEC_SIZE];
};
struct nfs_read_data {
struct nfs_pgio_header *header;
struct list_head list;
struct rpc_task task;
struct nfs_fattr fattr; /* fattr storage */
struct page **pagevec;
unsigned int npages; /* Max length of pagevec */
struct nfs_readargs args;
struct nfs_readres res;
unsigned long timestamp; /* For lease renewal */
int (*read_done_cb) (struct rpc_task *task, struct nfs_read_data *data);
__u64 mds_offset;
struct page *page_array[NFS_PAGEVEC_SIZE];
struct nfs_page_array pages;
struct nfs_client *ds_clp; /* pNFS data server */
};
@ -1206,14 +1210,12 @@ struct nfs_write_data {
struct rpc_task task;
struct nfs_fattr fattr;
struct nfs_writeverf verf;
struct page **pagevec;
unsigned int npages; /* Max length of pagevec */
struct nfs_writeargs args; /* argument struct */
struct nfs_writeres res; /* result struct */
unsigned long timestamp; /* For lease renewal */
int (*write_done_cb) (struct rpc_task *task, struct nfs_write_data *data);
__u64 mds_offset; /* Filelayout dense stripe */
struct page *page_array[NFS_PAGEVEC_SIZE];
struct nfs_page_array pages;
struct nfs_client *ds_clp; /* pNFS data server */
};