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Commit d70b9104 authored by Pavel Shilovsky's avatar Pavel Shilovsky Committed by Steve French
Browse files

CIFS: Add copy into pages callback for a read operation 



Since we have two different types of reads (pagecache and direct)
we need to process such responses differently after decryption of
a packet. The change allows to specify a callback that copies a read
payload data into preallocated pages.

Signed-off-by: default avatarPavel Shilovsky <pshilov@microsoft.com>
parent 9b7c18a2

fs/cifs/cifsglob.h

+3 −0
Original line number Diff line number Diff line
@@ -1129,6 +1129,9 @@ struct cifs_readdata { 
	int (*read_into_pages)(struct TCP_Server_Info *server,

				struct cifs_readdata *rdata,

				unsigned int len);

	int (*copy_into_pages)(struct TCP_Server_Info *server,

				struct cifs_readdata *rdata,

				struct iov_iter *iter);

	struct kvec			iov[2];

	unsigned int			pagesz;

	unsigned int			tailsz;

fs/cifs/file.c

+46 −6
Original line number Diff line number Diff line
@@ -2911,8 +2911,9 @@ cifs_uncached_readv_complete(struct work_struct *work) 
}



static int

cifs_uncached_read_into_pages(struct TCP_Server_Info *server,

			struct cifs_readdata *rdata, unsigned int len)

uncached_fill_pages(struct TCP_Server_Info *server,

		    struct cifs_readdata *rdata, struct iov_iter *iter,

		    unsigned int len)

{

	int result = 0;

	unsigned int i;
@@ -2941,6 +2942,9 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server, 
			rdata->tailsz = len;

			len = 0;

		}

		if (iter)

			result = copy_page_from_iter(page, 0, n, iter);

		else

			result = cifs_read_page_from_socket(server, page, n);

		if (result < 0)

			break;
@@ -2952,6 +2956,21 @@ cifs_uncached_read_into_pages(struct TCP_Server_Info *server, 
						rdata->got_bytes : result;

}



static int

cifs_uncached_read_into_pages(struct TCP_Server_Info *server,

			      struct cifs_readdata *rdata, unsigned int len)

{

	return uncached_fill_pages(server, rdata, NULL, len);

}



static int

cifs_uncached_copy_into_pages(struct TCP_Server_Info *server,

			      struct cifs_readdata *rdata,

			      struct iov_iter *iter)

{

	return uncached_fill_pages(server, rdata, iter, iter->count);

}



static int

cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,

		     struct cifs_sb_info *cifs_sb, struct list_head *rdata_list)
@@ -2999,6 +3018,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file, 
		rdata->pid = pid;

		rdata->pagesz = PAGE_SIZE;

		rdata->read_into_pages = cifs_uncached_read_into_pages;

		rdata->copy_into_pages = cifs_uncached_copy_into_pages;

		rdata->credits = credits;



		if (!rdata->cfile->invalidHandle ||
@@ -3349,8 +3369,9 @@ cifs_readv_complete(struct work_struct *work) 
}



static int

cifs_readpages_read_into_pages(struct TCP_Server_Info *server,

			struct cifs_readdata *rdata, unsigned int len)

readpages_fill_pages(struct TCP_Server_Info *server,

		     struct cifs_readdata *rdata, struct iov_iter *iter,

		     unsigned int len)

{

	int result = 0;

	unsigned int i;
@@ -3404,6 +3425,9 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server, 
			continue;

		}



		if (iter)

			result = copy_page_from_iter(page, 0, n, iter);

		else

			result = cifs_read_page_from_socket(server, page, n);

		if (result < 0)

			break;
@@ -3415,6 +3439,21 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server, 
						rdata->got_bytes : result;

}



static int

cifs_readpages_read_into_pages(struct TCP_Server_Info *server,

			       struct cifs_readdata *rdata, unsigned int len)

{

	return readpages_fill_pages(server, rdata, NULL, len);

}



static int

cifs_readpages_copy_into_pages(struct TCP_Server_Info *server,

			       struct cifs_readdata *rdata,

			       struct iov_iter *iter)

{

	return readpages_fill_pages(server, rdata, iter, iter->count);

}



static int

readpages_get_pages(struct address_space *mapping, struct list_head *page_list,

		    unsigned int rsize, struct list_head *tmplist,
@@ -3569,6 +3608,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping, 
		rdata->pid = pid;

		rdata->pagesz = PAGE_SIZE;

		rdata->read_into_pages = cifs_readpages_read_into_pages;

		rdata->copy_into_pages = cifs_readpages_copy_into_pages;

		rdata->credits = credits;



		list_for_each_entry_safe(page, tpage, &tmplist, lru) {