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: Maxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index 5cc838f..fb9dcfd 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -449,6 +449,7 @@
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);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index db4af8f..cbae09e 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -903,11 +903,11 @@
{
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 @@
return err;
nbytes -= count;
- count = min(nbytes, (unsigned) PAGE_SIZE);
- offset = 0;
}
return 0;
}
@@ -1626,6 +1624,7 @@
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;
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index d04bcc5..ed8f8c5 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1317,6 +1317,7 @@
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,
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2b6f08a..3384a20 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -555,6 +555,7 @@
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 @@
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 @@
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 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 @@
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 @@
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 @@
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 @@
}
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;