NFS: Cleanup of the nfs_pageio code in preparation for a pnfs bugfix
We need to ensure that the layouts are set up before we can decide to
coalesce requests. To do so, we want to further split up the struct
nfs_pageio_descriptor operations into an initialisation callback, a
coalescing test callback, and a 'do i/o' callback.
This patch cleans up the existing callback methods before adding the
'initialisation' callback.
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/fs/nfs/nfs4filelayout.c b/fs/nfs/nfs4filelayout.c
index b690bb5..46bb31b 100644
--- a/fs/nfs/nfs4filelayout.c
+++ b/fs/nfs/nfs4filelayout.c
@@ -658,7 +658,7 @@
* return true : coalesce page
* return false : don't coalesce page
*/
-bool
+static bool
filelayout_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
@@ -681,6 +681,16 @@
return (p_stripe == r_stripe);
}
+static const struct nfs_pageio_ops filelayout_pg_read_ops = {
+ .pg_test = filelayout_pg_test,
+ .pg_doio = nfs_generic_pg_readpages,
+};
+
+static const struct nfs_pageio_ops filelayout_pg_write_ops = {
+ .pg_test = filelayout_pg_test,
+ .pg_doio = nfs_generic_pg_writepages,
+};
+
static bool filelayout_mark_pnfs_commit(struct pnfs_layout_segment *lseg)
{
return !FILELAYOUT_LSEG(lseg)->commit_through_mds;
@@ -878,7 +888,8 @@
.owner = THIS_MODULE,
.alloc_lseg = filelayout_alloc_lseg,
.free_lseg = filelayout_free_lseg,
- .pg_test = filelayout_pg_test,
+ .pg_read_ops = &filelayout_pg_read_ops,
+ .pg_write_ops = &filelayout_pg_write_ops,
.mark_pnfs_commit = filelayout_mark_pnfs_commit,
.choose_commit_list = filelayout_choose_commit_list,
.commit_pagelist = filelayout_commit_pagelist,
diff --git a/fs/nfs/objlayout/objio_osd.c b/fs/nfs/objlayout/objio_osd.c
index 8ff2ea3..c203fab 100644
--- a/fs/nfs/objlayout/objio_osd.c
+++ b/fs/nfs/objlayout/objio_osd.c
@@ -1007,6 +1007,16 @@
OBJIO_LSEG(pgio->pg_lseg)->max_io_size;
}
+static const struct nfs_pageio_ops objio_pg_read_ops = {
+ .pg_test = objio_pg_test,
+ .pg_doio = nfs_generic_pg_readpages,
+};
+
+static const struct nfs_pageio_ops objio_pg_write_ops = {
+ .pg_test = objio_pg_test,
+ .pg_doio = nfs_generic_pg_writepages,
+};
+
static struct pnfs_layoutdriver_type objlayout_type = {
.id = LAYOUT_OSD2_OBJECTS,
.name = "LAYOUT_OSD2_OBJECTS",
@@ -1020,7 +1030,8 @@
.read_pagelist = objlayout_read_pagelist,
.write_pagelist = objlayout_write_pagelist,
- .pg_test = objio_pg_test,
+ .pg_read_ops = &objio_pg_read_ops,
+ .pg_write_ops = &objio_pg_write_ops,
.free_deviceid_node = objio_free_deviceid_node,
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index 0098557..9b8a473 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -230,7 +230,7 @@
*/
void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
struct inode *inode,
- int (*doio)(struct nfs_pageio_descriptor *),
+ const struct nfs_pageio_ops *pg_ops,
size_t bsize,
int io_flags)
{
@@ -241,12 +241,10 @@
desc->pg_base = 0;
desc->pg_moreio = 0;
desc->pg_inode = inode;
- desc->pg_doio = doio;
+ desc->pg_ops = pg_ops;
desc->pg_ioflags = io_flags;
desc->pg_error = 0;
desc->pg_lseg = NULL;
- desc->pg_test = nfs_generic_pg_test;
- pnfs_pageio_init(desc, inode);
}
/**
@@ -276,7 +274,7 @@
return false;
if (prev->wb_pgbase + prev->wb_bytes != PAGE_CACHE_SIZE)
return false;
- return pgio->pg_test(pgio, prev, req);
+ return pgio->pg_ops->pg_test(pgio, prev, req);
}
/**
@@ -311,7 +309,7 @@
static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
{
if (!list_empty(&desc->pg_list)) {
- int error = desc->pg_doio(desc);
+ int error = desc->pg_ops->pg_doio(desc);
if (error < 0)
desc->pg_error = error;
else
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index ff82007..7ec46d5 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1056,6 +1056,30 @@
}
bool
+pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
+
+ if (ld == NULL)
+ return false;
+ nfs_pageio_init(pgio, inode, ld->pg_read_ops, server->rsize, 0);
+ return true;
+}
+
+bool
+pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct pnfs_layoutdriver_type *ld = server->pnfs_curr_ld;
+
+ if (ld == NULL)
+ return false;
+ nfs_pageio_init(pgio, inode, ld->pg_write_ops, server->wsize, ioflags);
+ return true;
+}
+
+bool
pnfs_generic_pg_test(struct nfs_pageio_descriptor *pgio, struct nfs_page *prev,
struct nfs_page *req)
{
diff --git a/fs/nfs/pnfs.h b/fs/nfs/pnfs.h
index 96bf4e6..137a2bd 100644
--- a/fs/nfs/pnfs.h
+++ b/fs/nfs/pnfs.h
@@ -87,7 +87,8 @@
void (*free_lseg) (struct pnfs_layout_segment *lseg);
/* test for nfs page cache coalescing */
- bool (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
+ const struct nfs_pageio_ops *pg_read_ops;
+ const struct nfs_pageio_ops *pg_write_ops;
/* Returns true if layoutdriver wants to divert this request to
* driver's commit routine.
@@ -152,6 +153,10 @@
pnfs_update_layout(struct inode *ino, struct nfs_open_context *ctx,
loff_t pos, u64 count, enum pnfs_iomode access_type,
gfp_t gfp_flags);
+
+bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *, struct inode *);
+bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *, struct inode *, int);
+
void set_pnfs_layoutdriver(struct nfs_server *, u32 id);
void unset_pnfs_layoutdriver(struct nfs_server *);
enum pnfs_try_status pnfs_try_to_write_data(struct nfs_write_data *,
@@ -293,15 +298,6 @@
return 0;
}
-static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
- struct inode *inode)
-{
- struct pnfs_layoutdriver_type *ld = NFS_SERVER(inode)->pnfs_curr_ld;
-
- if (ld)
- pgio->pg_test = ld->pg_test;
-}
-
#else /* CONFIG_NFS_V4_1 */
static inline void pnfs_destroy_all_layouts(struct nfs_client *clp)
@@ -385,9 +381,14 @@
{
}
-static inline void pnfs_pageio_init(struct nfs_pageio_descriptor *pgio,
- struct inode *inode)
+static inline bool pnfs_pageio_init_read(struct nfs_pageio_descriptor *pgio, struct inode *inode)
{
+ return false;
+}
+
+static inline bool pnfs_pageio_init_write(struct nfs_pageio_descriptor *pgio, struct inode *inode, int ioflags)
+{
+ return false;
}
static inline void
diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 20a7f95..b6d9ec9 100644
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -32,6 +32,7 @@
static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc);
static int nfs_pagein_one(struct nfs_pageio_descriptor *desc);
+static const struct nfs_pageio_ops nfs_pageio_read_ops;
static const struct rpc_call_ops nfs_read_partial_ops;
static const struct rpc_call_ops nfs_read_full_ops;
@@ -113,6 +114,20 @@
}
}
+static void nfs_pageio_init_read_mds(struct nfs_pageio_descriptor *pgio,
+ struct inode *inode)
+{
+ nfs_pageio_init(pgio, inode, &nfs_pageio_read_ops,
+ NFS_SERVER(inode)->rsize, 0);
+}
+
+static void nfs_pageio_init_read(struct nfs_pageio_descriptor *pgio,
+ struct inode *inode)
+{
+ if (!pnfs_pageio_init_read(pgio, inode))
+ nfs_pageio_init_read_mds(pgio, inode);
+}
+
int nfs_readpage_async(struct nfs_open_context *ctx, struct inode *inode,
struct page *page)
{
@@ -131,14 +146,11 @@
if (len < PAGE_CACHE_SIZE)
zero_user_segment(page, len, PAGE_CACHE_SIZE);
- nfs_pageio_init(&pgio, inode, NULL, 0, 0);
+ nfs_pageio_init_read(&pgio, inode);
nfs_list_add_request(new, &pgio.pg_list);
pgio.pg_count = len;
- if (NFS_SERVER(inode)->rsize < PAGE_CACHE_SIZE)
- nfs_pagein_multi(&pgio);
- else
- nfs_pagein_one(&pgio);
+ nfs_pageio_complete(&pgio);
return 0;
}
@@ -365,6 +377,20 @@
return ret;
}
+int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
+{
+ if (desc->pg_bsize < PAGE_CACHE_SIZE)
+ return nfs_pagein_multi(desc);
+ return nfs_pagein_one(desc);
+}
+EXPORT_SYMBOL_GPL(nfs_generic_pg_readpages);
+
+
+static const struct nfs_pageio_ops nfs_pageio_read_ops = {
+ .pg_test = nfs_generic_pg_test,
+ .pg_doio = nfs_generic_pg_readpages,
+};
+
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
@@ -635,8 +661,6 @@
.pgio = &pgio,
};
struct inode *inode = mapping->host;
- struct nfs_server *server = NFS_SERVER(inode);
- size_t rsize = server->rsize;
unsigned long npages;
int ret = -ESTALE;
@@ -664,10 +688,7 @@
if (ret == 0)
goto read_complete; /* all pages were read */
- if (rsize < PAGE_CACHE_SIZE)
- nfs_pageio_init(&pgio, inode, nfs_pagein_multi, rsize, 0);
- else
- nfs_pageio_init(&pgio, inode, nfs_pagein_one, rsize, 0);
+ nfs_pageio_init_read(&pgio, inode);
ret = read_cache_pages(mapping, pages, readpage_async_filler, &desc);
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 7271680..b144b54 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1033,15 +1033,31 @@
return ret;
}
+int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
+{
+ if (desc->pg_bsize < PAGE_CACHE_SIZE)
+ return nfs_flush_multi(desc);
+ return nfs_flush_one(desc);
+}
+EXPORT_SYMBOL_GPL(nfs_generic_pg_writepages);
+
+static const struct nfs_pageio_ops nfs_pageio_write_ops = {
+ .pg_test = nfs_generic_pg_test,
+ .pg_doio = nfs_generic_pg_writepages,
+};
+
+static void nfs_pageio_init_write_mds(struct nfs_pageio_descriptor *pgio,
+ struct inode *inode, int ioflags)
+{
+ nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops,
+ NFS_SERVER(inode)->wsize, ioflags);
+}
+
static void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
struct inode *inode, int ioflags)
{
- size_t wsize = NFS_SERVER(inode)->wsize;
-
- if (wsize < PAGE_CACHE_SIZE)
- nfs_pageio_init(pgio, inode, nfs_flush_multi, wsize, ioflags);
- else
- nfs_pageio_init(pgio, inode, nfs_flush_one, wsize, ioflags);
+ if (!pnfs_pageio_init_write(pgio, inode, ioflags))
+ nfs_pageio_init_write_mds(pgio, inode, ioflags);
}
/*
diff --git a/include/linux/nfs_page.h b/include/linux/nfs_page.h
index 25311b3..d378f08 100644
--- a/include/linux/nfs_page.h
+++ b/include/linux/nfs_page.h
@@ -55,6 +55,12 @@
struct nfs_writeverf wb_verf; /* Commit cookie */
};
+struct nfs_pageio_descriptor;
+struct nfs_pageio_ops {
+ bool (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
+ int (*pg_doio)(struct nfs_pageio_descriptor *);
+};
+
struct nfs_pageio_descriptor {
struct list_head pg_list;
unsigned long pg_bytes_written;
@@ -64,11 +70,10 @@
char pg_moreio;
struct inode *pg_inode;
- int (*pg_doio)(struct nfs_pageio_descriptor *);
+ const struct nfs_pageio_ops *pg_ops;
int pg_ioflags;
int pg_error;
struct pnfs_layout_segment *pg_lseg;
- bool (*pg_test)(struct nfs_pageio_descriptor *, struct nfs_page *, struct nfs_page *);
};
#define NFS_WBACK_BUSY(req) (test_bit(PG_BUSY,&(req)->wb_flags))
@@ -85,7 +90,7 @@
pgoff_t idx_start, unsigned int npages, int tag);
extern void nfs_pageio_init(struct nfs_pageio_descriptor *desc,
struct inode *inode,
- int (*doio)(struct nfs_pageio_descriptor *desc),
+ const struct nfs_pageio_ops *pg_ops,
size_t bsize,
int how);
extern int nfs_pageio_add_request(struct nfs_pageio_descriptor *,
@@ -100,6 +105,9 @@
extern int nfs_set_page_tag_locked(struct nfs_page *req);
extern void nfs_clear_page_tag_locked(struct nfs_page *req);
+extern int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc);
+extern int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc);
+
/*
* Lock the page of an asynchronous request without getting a new reference