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authorMiklos Szeredi <mszeredi@redhat.com>2019-09-10 15:04:09 +0200
committerMiklos Szeredi <mszeredi@redhat.com>2019-09-10 16:29:49 +0200
commit68583165f962793a6fe7d11f54713045f43fc8bb (patch)
tree2c38f8b25f8619d19450f2d483496b4ae49eeb54 /fs/fuse
parent1ccd1ea24962276ca0548386889ef7bf57479c5d (diff)
downloadlinux-68583165f962793a6fe7d11f54713045f43fc8bb.tar.bz2
fuse: add pages to fuse_args
Derive fuse_args_pages from fuse_args. This is used to handle requests which use pages for input or output. The related flags are added to fuse_args. New FR_ALLOC_PAGES flags is added to indicate whether the page arrays in fuse_req need to be freed by fuse_put_request() or not. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/dev.c41
-rw-r--r--fs/fuse/fuse_i.h12
2 files changed, 43 insertions, 10 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 9f1549166a5d..3ef85c957122 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -81,6 +81,7 @@ static struct fuse_req *__fuse_request_alloc(unsigned npages, gfp_t flags)
kmem_cache_free(fuse_req_cachep, req);
return NULL;
}
+ __set_bit(FR_ALLOC_PAGES, &req->flags);
} else if (npages) {
pages = req->inline_pages;
page_descs = req->inline_page_descs;
@@ -104,7 +105,7 @@ struct fuse_req *fuse_request_alloc_nofs(unsigned npages)
static void fuse_req_pages_free(struct fuse_req *req)
{
- if (req->pages != req->inline_pages)
+ if (test_bit(FR_ALLOC_PAGES, &req->flags))
kfree(req->pages);
}
@@ -127,6 +128,7 @@ bool fuse_req_realloc_pages(struct fuse_conn *fc, struct fuse_req *req,
memcpy(page_descs, req->page_descs,
sizeof(struct fuse_page_desc) * req->max_pages);
fuse_req_pages_free(req);
+ __set_bit(FR_ALLOC_PAGES, &req->flags);
req->pages = pages;
req->page_descs = page_descs;
req->max_pages = npages;
@@ -544,6 +546,33 @@ static void fuse_force_creds(struct fuse_conn *fc, struct fuse_req *req)
req->in.h.pid = pid_nr_ns(task_pid(current), fc->pid_ns);
}
+void fuse_args_to_req(struct fuse_req *req, struct fuse_args *args)
+{
+ struct fuse_args_pages *ap = container_of(args, typeof(*ap), args);
+
+ req->in.h.opcode = args->opcode;
+ req->in.h.nodeid = args->nodeid;
+ req->in.numargs = args->in_numargs;
+ memcpy(req->in.args, args->in_args,
+ args->in_numargs * sizeof(struct fuse_in_arg));
+ req->out.argvar = args->out_argvar;
+ req->out.numargs = args->out_numargs;
+ memcpy(req->out.args, args->out_args,
+ args->out_numargs * sizeof(struct fuse_arg));
+
+ if (args->in_pages || args->out_pages) {
+ req->in.argpages = args->in_pages;
+ req->out.argpages = args->out_pages;
+ req->out.page_zeroing = args->page_zeroing;
+ req->out.page_replace = args->page_replace;
+
+ req->pages = ap->pages;
+ req->page_descs = ap->descs;
+ req->num_pages = ap->num_pages;
+ }
+
+}
+
ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
{
struct fuse_req *req;
@@ -567,16 +596,8 @@ ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
/* Needs to be done after fuse_get_req() so that fc->minor is valid */
fuse_adjust_compat(fc, args);
+ fuse_args_to_req(req, args);
- req->in.h.opcode = args->opcode;
- req->in.h.nodeid = args->nodeid;
- req->in.numargs = args->in_numargs;
- memcpy(req->in.args, args->in_args,
- args->in_numargs * sizeof(struct fuse_in_arg));
- req->out.argvar = args->out_argvar;
- req->out.numargs = args->out_numargs;
- memcpy(req->out.args, args->out_args,
- args->out_numargs * sizeof(struct fuse_arg));
if (!args->noreply)
__set_bit(FR_ISREPLY, &req->flags);
__fuse_request_send(fc, req);
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 73f70f3872e7..1998d6ab4025 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -294,11 +294,22 @@ struct fuse_args {
bool force:1;
bool noreply:1;
bool nocreds:1;
+ bool in_pages:1;
+ bool out_pages:1;
bool out_argvar:1;
+ bool page_zeroing:1;
+ bool page_replace:1;
struct fuse_in_arg in_args[3];
struct fuse_arg out_args[2];
};
+struct fuse_args_pages {
+ struct fuse_args args;
+ struct page **pages;
+ struct fuse_page_desc *descs;
+ unsigned int num_pages;
+};
+
#define FUSE_ARGS(args) struct fuse_args args = {}
/** The request IO state (for asynchronous processing) */
@@ -352,6 +363,7 @@ enum fuse_req_flag {
FR_SENT,
FR_FINISHED,
FR_PRIVATE,
+ FR_ALLOC_PAGES,
};
/**