Commit 85f40aec authored by Maxim Patlasov's avatar Maxim Patlasov Committed by Miklos Szeredi
Browse files

fuse: use req->page_descs[] for argpages cases



Previously, anyone who set flag 'argpages' only filled req->pages[] and set
per-request page_offset. This patch re-works all cases where argpages=1 to
fill req->page_descs[] properly.

Having req->page_descs[] filled properly allows to re-work fuse_copy_pages()
to copy page fragments described by req->page_descs[]. This will be useful
for next patches optimizing direct_IO.
Signed-off-by: default avatarMaxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: default avatarMiklos Szeredi <mszeredi@suse.cz>
parent b2430d75
......@@ -449,6 +449,7 @@ static int cuse_send_init(struct cuse_conn *cc)
req->out.argvar = 1;
req->out.argpages = 1;
req->pages[0] = page;
req->page_descs[0].length = req->out.args[1].size;
req->num_pages = 1;
req->end = cuse_process_init_reply;
fuse_request_send_background(fc, req);
......
......@@ -903,11 +903,11 @@ static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
{
unsigned i;
struct fuse_req *req = cs->req;
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++) {
int err;
unsigned offset = req->page_descs[i].offset;
unsigned count = min(nbytes, req->page_descs[i].length);
err = fuse_copy_page(cs, &req->pages[i], offset, count,
zeroing);
......@@ -915,8 +915,6 @@ static int fuse_copy_pages(struct fuse_copy_state *cs, unsigned nbytes,
return err;
nbytes -= count;
count = min(nbytes, (unsigned) PAGE_SIZE);
offset = 0;
}
return 0;
}
......@@ -1626,6 +1624,7 @@ static int fuse_retrieve(struct fuse_conn *fc, struct inode *inode,
this_num = min_t(unsigned, num, PAGE_CACHE_SIZE - offset);
req->pages[req->num_pages] = page;
req->page_descs[req->num_pages].length = this_num;
req->num_pages++;
offset = 0;
......
......@@ -1317,6 +1317,7 @@ static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = PAGE_SIZE;
if (fc->do_readdirplus) {
attr_version = fuse_get_attr_version(fc);
fuse_read_fill(req, file, file->f_pos, PAGE_SIZE,
......
......@@ -555,6 +555,7 @@ static int fuse_readpage(struct file *file, struct page *page)
req->out.argpages = 1;
req->num_pages = 1;
req->pages[0] = page;
req->page_descs[0].length = count;
num_read = fuse_send_read(req, file, pos, count, NULL);
err = req->out.h.error;
fuse_put_request(fc, req);
......@@ -674,6 +675,7 @@ static int fuse_readpages_fill(void *_data, struct page *page)
page_cache_get(page);
req->pages[req->num_pages] = page;
req->page_descs[req->num_pages].length = PAGE_SIZE;
req->num_pages++;
data->nr_pages--;
return 0;
......@@ -869,6 +871,7 @@ static ssize_t fuse_fill_write_pages(struct fuse_req *req,
err = 0;
req->pages[req->num_pages] = page;
req->page_descs[req->num_pages].length = tmp;
req->num_pages++;
iov_iter_advance(ii, tmp);
......@@ -1044,6 +1047,15 @@ static void fuse_release_user_pages(struct fuse_req *req, int write)
}
}
static inline void fuse_page_descs_length_init(struct fuse_req *req)
{
int i;
for (i = 0; i < req->num_pages; i++)
req->page_descs[i].length = PAGE_SIZE -
req->page_descs[i].offset;
}
static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
size_t *nbytesp, int write)
{
......@@ -1071,6 +1083,7 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
req->num_pages = npages;
req->page_descs[0].offset = offset;
fuse_page_descs_length_init(req);
if (write)
req->in.argpages = 1;
......@@ -1078,6 +1091,11 @@ static int fuse_get_user_pages(struct fuse_req *req, const char __user *buf,
req->out.argpages = 1;
nbytes = (req->num_pages << PAGE_SHIFT) - req->page_descs[0].offset;
if (*nbytesp < nbytes)
req->page_descs[req->num_pages - 1].length -=
nbytes - *nbytesp;
*nbytesp = min(*nbytesp, nbytes);
return 0;
......@@ -1315,6 +1333,7 @@ static int fuse_writepage_locked(struct page *page)
req->num_pages = 1;
req->pages[0] = tmp_page;
req->page_descs[0].offset = 0;
req->page_descs[0].length = PAGE_SIZE;
req->end = fuse_writepage_end;
req->inode = inode;
......@@ -1902,6 +1921,7 @@ long fuse_do_ioctl(struct file *file, unsigned int cmd, unsigned long arg,
}
memcpy(req->pages, pages, sizeof(req->pages[0]) * num_pages);
req->num_pages = num_pages;
fuse_page_descs_length_init(req);
/* okay, let's send it to the client */
req->in.h.opcode = FUSE_IOCTL;
......
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