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authorMaxim Patlasov <mpatlasov@parallels.com>2012-10-26 19:49:24 +0400
committerMiklos Szeredi <mszeredi@suse.cz>2013-01-24 16:21:27 +0100
commitb2430d7567a376b3685627ca7e9d712f6f27d49b (patch)
tree2c59795b27e57f6a0a6c15d0f8aea3aac32f8317 /fs/fuse/dev.c
parent54b966702dafe396b6f4e609f222b8e0fdb4d7a4 (diff)
downloadop-kernel-dev-b2430d7567a376b3685627ca7e9d712f6f27d49b.zip
op-kernel-dev-b2430d7567a376b3685627ca7e9d712f6f27d49b.tar.gz
fuse: add per-page descriptor <offset, length> to fuse_req
The ability to save page pointers along with lengths and offsets in fuse_req will be useful to cover several iovec-s with a single fuse_req. Per-request page_offset is removed because anybody who need it can use req->page_descs[0].offset instead. Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'fs/fuse/dev.c')
-rw-r--r--fs/fuse/dev.c28
1 files changed, 20 insertions, 8 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 28d9792..db4af8f 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -35,15 +35,18 @@ static struct fuse_conn *fuse_get_conn(struct file *file)
}
static void fuse_request_init(struct fuse_req *req, struct page **pages,
+ struct fuse_page_desc *page_descs,
unsigned npages)
{
memset(req, 0, sizeof(*req));
memset(pages, 0, sizeof(*pages) * npages);
+ memset(page_descs, 0, sizeof(*page_descs) * npages);
INIT_LIST_HEAD(&req->list);
INIT_LIST_HEAD(&req->intr_entry);
init_waitqueue_head(&req->waitq);
atomic_set(&req->count, 1);
req->pages = pages;
+ req->page_descs = page_descs;
req->max_pages = npages;
}
@@ -52,18 +55,25 @@ static struct fuse_req *__fuse_request_alloc(unsigned npages, gfp_t flags)
struct fuse_req *req = kmem_cache_alloc(fuse_req_cachep, flags);
if (req) {
struct page **pages;
+ struct fuse_page_desc *page_descs;
- if (npages <= FUSE_REQ_INLINE_PAGES)
+ if (npages <= FUSE_REQ_INLINE_PAGES) {
pages = req->inline_pages;
- else
+ page_descs = req->inline_page_descs;
+ } else {
pages = kmalloc(sizeof(struct page *) * npages, flags);
+ page_descs = kmalloc(sizeof(struct fuse_page_desc) *
+ npages, flags);
+ }
- if (!pages) {
+ if (!pages || !page_descs) {
+ kfree(pages);
+ kfree(page_descs);
kmem_cache_free(fuse_req_cachep, req);
return NULL;
}
- fuse_request_init(req, pages, npages);
+ fuse_request_init(req, pages, page_descs, npages);
}
return req;
}
@@ -81,8 +91,10 @@ struct fuse_req *fuse_request_alloc_nofs(unsigned npages)
void fuse_request_free(struct fuse_req *req)
{
- if (req->pages != req->inline_pages)
+ if (req->pages != req->inline_pages) {
kfree(req->pages);
+ kfree(req->page_descs);
+ }
kmem_cache_free(fuse_req_cachep, req);
}
@@ -186,7 +198,7 @@ static void put_reserved_req(struct fuse_conn *fc, struct fuse_req *req)
struct fuse_file *ff = file->private_data;
spin_lock(&fc->lock);
- fuse_request_init(req, req->pages, req->max_pages);
+ fuse_request_init(req, req->pages, req->page_descs, req->max_pages);
BUG_ON(ff->reserved_req);
ff->reserved_req = req;
wake_up_all(&fc->reserved_req_waitq);
@@ -891,7 +903,7 @@ static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
{
unsigned i;
struct fuse_req *req = cs->req;
- unsigned offset = req->page_offset;
+ unsigned offset = req->page_descs[0].offset;
unsigned count = min(nbytes, (unsigned) PAGE_SIZE - offset);
for (i = 0; i < req->num_pages && (nbytes || zeroing); i++) {
@@ -1599,7 +1611,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
req->in.h.nodeid = outarg->nodeid;
req->in.numargs = 2;
req->in.argpages = 1;
- req->page_offset = offset;
+ req->page_descs[0].offset = offset;
req->end = fuse_retrieve_end;
index = outarg->offset >> PAGE_CACHE_SHIFT;
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