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fuse: add per-page descriptor <offset, length> to fuse_req

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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>
This commit is contained in:
Maxim Patlasov 2012-10-26 19:49:24 +04:00 committed by Miklos Szeredi
parent 54b966702d
commit b2430d7567
3 changed files with 37 additions and 16 deletions
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28
fs/fuse/dev.c
View file

@ -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;

10
fs/fuse/file.c
View file

@ -798,7 +798,7 @@ static size_t fuse_send_write_pages(struct fuse_req *req, struct file *file,
res = fuse_send_write(req, file, pos, count, NULL);
offset = req->page_offset;
offset = req->page_descs[0].offset;
count = res;
for (i = 0; i < req->num_pages; i++) {
struct page *page = req->pages[i];
@ -829,7 +829,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
int err;
req->in.argpages = 1;
req->page_offset = offset;
req->page_descs[0].offset = offset;
do {
size_t tmp;
@ -1070,14 +1070,14 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
return npages;
req->num_pages = npages;
req->page_offset = offset;
req->page_descs[0].offset = offset;
if (write)
req->in.argpages = 1;
else
req->out.argpages = 1;
nbytes = (req->num_pages << PAGE_SHIFT) - req->page_offset;
nbytes = (req->num_pages << PAGE_SHIFT) - req->page_descs[0].offset;
*nbytesp = min(*nbytesp, nbytes);
return 0;
@ -1314,7 +1314,7 @@ static int fuse_writepage_locked(struct page *page)
req->in.argpages = 1;
req->num_pages = 1;
req->pages[0] = tmp_page;
req->page_offset = 0;
req->page_descs[0].offset = 0;
req->end = fuse_writepage_end;
req->inode = inode;

15
fs/fuse/fuse_i.h
View file

@ -203,6 +203,12 @@ struct fuse_out {
struct fuse_arg args[3];
};
/** FUSE page descriptor */
struct fuse_page_desc {
unsigned int length;
unsigned int offset;
};
/** The request state */
enum fuse_req_state {
FUSE_REQ_INIT = 0,
@ -296,18 +302,21 @@ struct fuse_req {
/** page vector */
struct page **pages;
/** page-descriptor vector */
struct fuse_page_desc *page_descs;
/** size of the 'pages' array */
unsigned max_pages;
/** inline page vector */
struct page *inline_pages[FUSE_REQ_INLINE_PAGES];
/** inline page-descriptor vector */
struct fuse_page_desc inline_page_descs[FUSE_REQ_INLINE_PAGES];
/** number of pages in vector */
unsigned num_pages;
/** offset of data on first page */
unsigned page_offset;
/** File used in the request (or NULL) */
struct fuse_file *ff;