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Subject[Patch v3 03/16] CIFS: Add support for direct pages in wdata
Date
From: Long Li <longli@microsoft.com>

Add a function to allocate wdata without allocating pages for data
transfer. This gives the caller an option to pass a number of pages that
point to the data buffer to write to.

wdata is reponsible for free those pages after it's done.

Signed-off-by: Long Li <longli@microsoft.com>
---
fs/cifs/cifsglob.h | 3 +--
fs/cifs/cifsproto.h | 2 ++
fs/cifs/cifssmb.c | 17 ++++++++++++++---
3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 166e140..7f62c98 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1199,14 +1199,13 @@ struct cifs_writedata {
int result;
#ifdef CONFIG_CIFS_SMB_DIRECT
struct smbd_mr *mr;
- struct page **direct_pages;
#endif
unsigned int pagesz;
unsigned int page_offset;
unsigned int tailsz;
unsigned int credits;
unsigned int nr_pages;
- struct page *pages[];
+ struct page **pages;
};

/*
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h
index 1f27d8e..7933c5f 100644
--- a/fs/cifs/cifsproto.h
+++ b/fs/cifs/cifsproto.h
@@ -533,6 +533,8 @@ int cifs_async_writev(struct cifs_writedata *wdata,
void cifs_writev_complete(struct work_struct *work);
struct cifs_writedata *cifs_writedata_alloc(unsigned int nr_pages,
work_func_t complete);
+struct cifs_writedata *cifs_writedata_direct_alloc(struct page **pages,
+ work_func_t complete);
void cifs_writedata_release(struct kref *refcount);
int cifs_query_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
struct cifs_sb_info *cifs_sb,
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index a1af258..503e0ed 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1953,6 +1953,7 @@ cifs_writedata_release(struct kref *refcount)
if (wdata->cfile)
cifsFileInfo_put(wdata->cfile);

+ kvfree(wdata->pages);
kfree(wdata);
}

@@ -2076,12 +2077,22 @@ cifs_writev_complete(struct work_struct *work)
struct cifs_writedata *
cifs_writedata_alloc(unsigned int nr_pages, work_func_t complete)
{
+ struct page **pages =
+ kzalloc(sizeof(struct page *) * nr_pages, GFP_NOFS);
+ if (pages)
+ return cifs_writedata_direct_alloc(pages, complete);
+
+ return NULL;
+}
+
+struct cifs_writedata *
+cifs_writedata_direct_alloc(struct page **pages, work_func_t complete)
+{
struct cifs_writedata *wdata;

- /* writedata + number of page pointers */
- wdata = kzalloc(sizeof(*wdata) +
- sizeof(struct page *) * nr_pages, GFP_NOFS);
+ wdata = kzalloc(sizeof(*wdata), GFP_NOFS);
if (wdata != NULL) {
+ wdata->pages = pages;
kref_init(&wdata->refcount);
INIT_LIST_HEAD(&wdata->list);
init_completion(&wdata->done);
--
2.7.4
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