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CIFS: Add support for direct pages in wdata 

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>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Long Li 2018-05-30 12:47:56 -07:00 committed by Steve French
parent 1dbe3466b4
commit 8e7360f67e
3 changed files with 17 additions and 4 deletions
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2
fs/cifs/cifsglob.h
View File

@ -1211,7 +1211,7 @@ struct cifs_writedata {
unsigned int tailsz;
unsigned int credits;
unsigned int nr_pages;
struct page *pages[];
struct page **pages;
};
/*

2
fs/cifs/cifsproto.h
View File

@ -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,

17
fs/cifs/cifssmb.c
View File

@ -1952,6 +1952,7 @@ cifs_writedata_release(struct kref *refcount)
if (wdata->cfile)
cifsFileInfo_put(wdata->cfile);
kvfree(wdata->pages);
kfree(wdata);
}
@ -2074,13 +2075,23 @@ 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);