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fuse: add pages to fuse_args

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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>
This commit is contained in:
Miklos Szeredi 2019-09-10 15:04:09 +02:00
parent 1ccd1ea249
commit 68583165f9
2 changed files with 43 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
fs/fuse/dev.c
View File

@ -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);

12
fs/fuse/fuse_i.h
View File

@ -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,
};
/**