fuse: stop copying args to fuse_req
No need to duplicate the argument arrays in fuse_req, so just dereference
req->args instead of copying to the fuse_req internal ones.
This allows further cleanup of the fuse_req structure.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index f240d54..dfc0658 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -202,7 +202,8 @@ static unsigned int fuse_req_hash(u64 unique)
static void queue_request(struct fuse_iqueue *fiq, struct fuse_req *req)
{
req->in.h.len = sizeof(struct fuse_in_header) +
- len_args(req->in.numargs, (struct fuse_arg *) req->in.args);
+ len_args(req->args->in_numargs,
+ (struct fuse_arg *) req->args->in_args);
list_add_tail(&req->list, &fiq->pending);
wake_up(&fiq->waitq);
kill_fasync(&fiq->fasync, SIGIO, POLL_IN);
@@ -257,6 +258,7 @@ static void flush_bg_queue(struct fuse_conn *fc)
static void request_end(struct fuse_conn *fc, struct fuse_req *req)
{
struct fuse_iqueue *fiq = &fc->iq;
+ bool async = req->args->end;
if (test_and_set_bit(FR_FINISHED, &req->flags))
goto put_request;
@@ -302,8 +304,8 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req)
wake_up(&req->waitq);
}
- if (req->end)
- req->end(fc, req);
+ if (async)
+ req->args->end(fc, req->args, req->out.h.error);
put_request:
fuse_put_request(fc, req);
}
@@ -450,25 +452,12 @@ void fuse_args_to_req(struct fuse_req *req, struct fuse_args *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;
}
-
+ req->args = args;
}
ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
@@ -502,7 +491,7 @@ ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
ret = req->out.h.error;
if (!ret && args->out_argvar) {
BUG_ON(args->out_numargs == 0);
- ret = req->out.args[args->out_numargs - 1].size;
+ ret = args->out_args[args->out_numargs - 1].size;
}
fuse_put_request(fc, req);
@@ -538,19 +527,6 @@ static bool fuse_request_queue_background(struct fuse_conn *fc,
return queued;
}
-static void fuse_simple_end(struct fuse_conn *fc, struct fuse_req *req)
-{
- struct fuse_args *args = req->args;
- int err = req->out.h.error;
-
- if (!err && args->out_argvar) {
- BUG_ON(args->out_numargs == 0);
- args->out_args[args->out_numargs - 1].size =
- req->out.args[args->out_numargs - 1].size;
- }
- req->args->end(fc, req->args, req->out.h.error);
-}
-
int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
gfp_t gfp_flags)
{
@@ -571,9 +547,6 @@ int fuse_simple_background(struct fuse_conn *fc, struct fuse_args *args,
fuse_args_to_req(req, args);
- req->args = args;
- req->end = fuse_simple_end;
-
if (!fuse_request_queue_background(fc, req)) {
fuse_put_request(fc, req);
return -ENOTCONN;
@@ -598,8 +571,6 @@ static int fuse_simple_notify_reply(struct fuse_conn *fc,
req->in.h.unique = unique;
fuse_args_to_req(req, args);
- req->args = args;
- req->end = fuse_simple_end;
spin_lock(&fiq->lock);
if (fiq->connected) {
@@ -1197,7 +1168,7 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
struct fuse_iqueue *fiq = &fc->iq;
struct fuse_pqueue *fpq = &fud->pq;
struct fuse_req *req;
- struct fuse_in *in;
+ struct fuse_args *args;
unsigned reqsize;
unsigned int hash;
@@ -1258,14 +1229,14 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
list_del_init(&req->list);
spin_unlock(&fiq->lock);
- in = &req->in;
- reqsize = in->h.len;
+ args = req->args;
+ reqsize = req->in.h.len;
/* If request is too large, reply with an error and restart the read */
if (nbytes < reqsize) {
req->out.h.error = -EIO;
/* SETXATTR is special, since it may contain too large data */
- if (in->h.opcode == FUSE_SETXATTR)
+ if (args->opcode == FUSE_SETXATTR)
req->out.h.error = -E2BIG;
request_end(fc, req);
goto restart;
@@ -1274,10 +1245,10 @@ static ssize_t fuse_dev_do_read(struct fuse_dev *fud, struct file *file,
list_add(&req->list, &fpq->io);
spin_unlock(&fpq->lock);
cs->req = req;
- err = fuse_copy_one(cs, &in->h, sizeof(in->h));
+ err = fuse_copy_one(cs, &req->in.h, sizeof(req->in.h));
if (!err)
- err = fuse_copy_args(cs, in->numargs, in->argpages,
- (struct fuse_arg *) in->args, 0);
+ err = fuse_copy_args(cs, args->in_numargs, args->in_pages,
+ (struct fuse_arg *) args->in_args, 0);
fuse_copy_finish(cs);
spin_lock(&fpq->lock);
clear_bit(FR_LOCKED, &req->flags);
@@ -1808,27 +1779,25 @@ static struct fuse_req *request_find(struct fuse_pqueue *fpq, u64 unique)
return NULL;
}
-static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
+static int copy_out_args(struct fuse_copy_state *cs, struct fuse_args *args,
unsigned nbytes)
{
unsigned reqsize = sizeof(struct fuse_out_header);
- if (out->h.error)
- return nbytes != reqsize ? -EINVAL : 0;
+ reqsize += len_args(args->out_numargs, args->out_args);
- reqsize += len_args(out->numargs, out->args);
-
- if (reqsize < nbytes || (reqsize > nbytes && !out->argvar))
+ if (reqsize < nbytes || (reqsize > nbytes && !args->out_argvar))
return -EINVAL;
else if (reqsize > nbytes) {
- struct fuse_arg *lastarg = &out->args[out->numargs-1];
+ struct fuse_arg *lastarg = &args->out_args[args->out_numargs-1];
unsigned diffsize = reqsize - nbytes;
+
if (diffsize > lastarg->size)
return -EINVAL;
lastarg->size -= diffsize;
}
- return fuse_copy_args(cs, out->numargs, out->argpages, out->args,
- out->page_zeroing);
+ return fuse_copy_args(cs, args->out_numargs, args->out_pages,
+ args->out_args, args->page_zeroing);
}
/*
@@ -1907,10 +1876,13 @@ static ssize_t fuse_dev_do_write(struct fuse_dev *fud,
set_bit(FR_LOCKED, &req->flags);
spin_unlock(&fpq->lock);
cs->req = req;
- if (!req->out.page_replace)
+ if (!req->args->page_replace)
cs->move_pages = 0;
- err = copy_out_args(cs, &req->out, nbytes);
+ if (oh.error)
+ err = nbytes != sizeof(oh) ? -EINVAL : 0;
+ else
+ err = copy_out_args(cs, req->args, nbytes);
fuse_copy_finish(cs);
spin_lock(&fpq->lock);