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fuse: make request allocations for background processing explicit

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There are two types of processing requests in FUSE: synchronous (via
fuse_request_send()) and asynchronous (via adding to fc->bg_queue).

Fortunately, the type of processing is always known in advance, at the time
of request allocation. This preparatory patch utilizes this fact making
fuse_get_req() aware about the type. Next patches will use it.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
This commit is contained in:
Maxim Patlasov 2013-03-21 18:02:04 +04:00 • committed by Miklos Szeredi
commit 8b41e6715e
5 changed files with 37 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

2
fs/fuse/cuse.c
View file

@ -422,7 +422,7 @@ static int cuse_send_init(struct cuse_conn *cc)
BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE);
req = fuse_get_req(fc, 1);
req = fuse_get_req_for_background(fc, 1);
if (IS_ERR(req)) {
rc = PTR_ERR(req);
goto err;

20
fs/fuse/dev.c
View file

@ -130,7 +130,8 @@ static void fuse_req_init_context(struct fuse_req *req)
req->in.h.pid = current->pid;
}
struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages)
static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages,
bool for_background)
{
struct fuse_req *req;
sigset_t oldset;
@ -156,14 +157,27 @@ struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages)
fuse_req_init_context(req);
req->waiting = 1;
req->background = for_background;
return req;
out:
atomic_dec(&fc->num_waiting);
return ERR_PTR(err);
}
struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages)
{
return __fuse_get_req(fc, npages, false);
}
EXPORT_SYMBOL_GPL(fuse_get_req);
struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
unsigned npages)
{
return __fuse_get_req(fc, npages, true);
}
EXPORT_SYMBOL_GPL(fuse_get_req_for_background);
/*
* Return request in fuse_file->reserved_req. However that may
* currently be in use. If that is the case, wait for it to become
@ -232,6 +246,7 @@ struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
fuse_req_init_context(req);
req->waiting = 1;
req->background = 0;
return req;
}
@ -442,6 +457,7 @@ __acquires(fc->lock)
static void __fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
{
BUG_ON(req->background);
spin_lock(&fc->lock);
if (!fc->connected)
req->out.h.error = -ENOTCONN;
@ -469,7 +485,7 @@ EXPORT_SYMBOL_GPL(fuse_request_send);
static void fuse_request_send_nowait_locked(struct fuse_conn *fc,
struct fuse_req *req)
{
req->background = 1;
BUG_ON(!req->background);
fc->num_background++;
if (fc->num_background == fc->max_background)
fc->blocked = 1;

16
fs/fuse/file.c
View file

@ -126,11 +126,13 @@ static void fuse_file_put(struct fuse_file *ff, bool sync)
struct fuse_req *req = ff->reserved_req;
if (sync) {
req->background = 0;
fuse_request_send(ff->fc, req);
path_put(&req->misc.release.path);
fuse_put_request(ff->fc, req);
} else {
req->end = fuse_release_end;
req->background = 1;
fuse_request_send_background(ff->fc, req);
}
kfree(ff);
@ -282,6 +284,7 @@ void fuse_sync_release(struct fuse_file *ff, int flags)
WARN_ON(atomic_read(&ff->count) > 1);
fuse_prepare_release(ff, flags, FUSE_RELEASE);
ff->reserved_req->force = 1;
ff->reserved_req->background = 0;
fuse_request_send(ff->fc, ff->reserved_req);
fuse_put_request(ff->fc, ff->reserved_req);
kfree(ff);
@ -661,7 +664,12 @@ static int fuse_readpages_fill(void *_data, struct page *page)
int nr_alloc = min_t(unsigned, data->nr_pages,
FUSE_MAX_PAGES_PER_REQ);
fuse_send_readpages(req, data->file);
data->req = req = fuse_get_req(fc, nr_alloc);
if (fc->async_read)
req = fuse_get_req_for_background(fc, nr_alloc);
else
req = fuse_get_req(fc, nr_alloc);
data->req = req;
if (IS_ERR(req)) {
unlock_page(page);
return PTR_ERR(req);
@ -696,7 +704,10 @@ static int fuse_readpages(struct file *file, struct address_space *mapping,
data.file = file;
data.inode = inode;
data.req = fuse_get_req(fc, nr_alloc);
if (fc->async_read)
data.req = fuse_get_req_for_background(fc, nr_alloc);
else
data.req = fuse_get_req(fc, nr_alloc);
data.nr_pages = nr_pages;
err = PTR_ERR(data.req);
if (IS_ERR(data.req))
@ -1375,6 +1386,7 @@ static int fuse_writepage_locked(struct page *page)
if (!req)
goto err;
req->background = 1; /* writeback always goes to bg_queue */
tmp_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
if (!tmp_page)
goto err_free;

2
fs/fuse/fuse_i.h
View file

@ -708,6 +708,8 @@ void fuse_request_free(struct fuse_req *req);
* caller should specify # elements in req->pages[] explicitly
*/
struct fuse_req *fuse_get_req(struct fuse_conn *fc, unsigned npages);
struct fuse_req *fuse_get_req_for_background(struct fuse_conn *fc,
unsigned npages);
/**
* Get a request, may fail with -ENOMEM,

2
fs/fuse/inode.c
View file

@ -346,6 +346,7 @@ static void fuse_send_destroy(struct fuse_conn *fc)
fc->destroy_req = NULL;
req->in.h.opcode = FUSE_DESTROY;
req->force = 1;
req->background = 0;
fuse_request_send(fc, req);
fuse_put_request(fc, req);
}
@ -1043,6 +1044,7 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
init_req = fuse_request_alloc(0);
if (!init_req)
goto err_put_root;
init_req->background = 1;
if (is_bdev) {
fc->destroy_req = fuse_request_alloc(0);