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authorLong Li <longli@microsoft.com>2018-05-30 12:47:56 -0700
committerSteve French <smfrench@gmail.com>2018-06-02 18:36:26 -0500
commit8e7360f67e75e06f3ea144354243728fb8f54c57 (patch)
treea17499125a7b605275034d9dbbdf76911c1b5a0d /fs/cifs/cifssmb.c
parent1dbe3466b4d26078d907c64e2b68faed5dc58854 (diff)
downloadop-kernel-dev-8e7360f67e75e06f3ea144354243728fb8f54c57.zip
op-kernel-dev-8e7360f67e75e06f3ea144354243728fb8f54c57.tar.gz
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>
Diffstat (limited to 'fs/cifs/cifssmb.c')
-rw-r--r--fs/cifs/cifssmb.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c
index c8e4278..5aca336 100644
--- a/fs/cifs/cifssmb.c
+++ b/fs/cifs/cifssmb.c
@@ -1952,6 +1952,7 @@ cifs_writedata_release(struct kref *refcount)
if (wdata->cfile)
cifsFileInfo_put(wdata->cfile);
+ kvfree(wdata->pages);
kfree(wdata);
}
@@ -2075,12 +2076,22 @@ 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);
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