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Commit f9f5aca1 authored by Long Li's avatar Long Li Committed by Steve French
Browse files

CIFS: Add support for direct pages in rdata 



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

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

Signed-off-by: default avatarLong Li <longli@microsoft.com>
Signed-off-by: default avatarSteve French <smfrench@gmail.com>
parent 8ce79ec3

fs/cifs/cifsglob.h

+1 −1
Original line number Diff line number Diff line
@@ -1185,7 +1185,7 @@ struct cifs_readdata { 
	unsigned int			tailsz;

	unsigned int			credits;

	unsigned int			nr_pages;

	struct page			*pages[];

	struct page			**pages;

};



struct cifs_writedata;

fs/cifs/file.c

+20 −3
Original line number Diff line number Diff line
@@ -2880,13 +2880,13 @@ cifs_strict_writev(struct kiocb *iocb, struct iov_iter *from) 
}



static struct cifs_readdata *

cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)

cifs_readdata_direct_alloc(struct page **pages, work_func_t complete)

{

	struct cifs_readdata *rdata;



	rdata = kzalloc(sizeof(*rdata) + (sizeof(struct page *) * nr_pages),

			GFP_KERNEL);

	rdata = kzalloc(sizeof(*rdata), GFP_KERNEL);

	if (rdata != NULL) {

		rdata->pages = pages;

		kref_init(&rdata->refcount);

		INIT_LIST_HEAD(&rdata->list);

		init_completion(&rdata->done);
@@ -2896,6 +2896,22 @@ cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete) 
	return rdata;

}



static struct cifs_readdata *

cifs_readdata_alloc(unsigned int nr_pages, work_func_t complete)

{

	struct page **pages =

		kzalloc(sizeof(struct page *) * nr_pages, GFP_KERNEL);

	struct cifs_readdata *ret = NULL;



	if (pages) {

		ret = cifs_readdata_direct_alloc(pages, complete);

		if (!ret)

			kfree(pages);

	}



	return ret;

}



void

cifs_readdata_release(struct kref *refcount)

{
@@ -2910,6 +2926,7 @@ cifs_readdata_release(struct kref *refcount) 
	if (rdata->cfile)

		cifsFileInfo_put(rdata->cfile);



	kvfree(rdata->pages);

	kfree(rdata);

}