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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
commit00793ca5d4439a22b18c0939522c81fa8661a362 (patch)
treea5a9b135dd6a5851509f5346260e2b105106ee59 /fs/fuse
parenta0d45d84f4c9d119e0eaede4778211a789457a7a (diff)
downloadlinux-00793ca5d4439a22b18c0939522c81fa8661a362.tar.bz2
fuse: covert readpage to simple api
Derive fuse_io_args from struct fuse_args_pages. This will be used for both synchronous and asynchronous read/write requests. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse')
-rw-r--r--fs/fuse/file.c80
1 files changed, 48 insertions, 32 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 8e67add0f37f..d927c336683a 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -552,6 +552,33 @@ void fuse_read_fill(struct fuse_req *req, struct file *file, loff_t pos,
req->out.args[0].size = count;
}
+struct fuse_io_args {
+ struct {
+ struct fuse_read_in in;
+ } read;
+ struct fuse_args_pages ap;
+};
+
+void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
+ size_t count, int opcode)
+{
+ struct fuse_file *ff = file->private_data;
+ struct fuse_args *args = &ia->ap.args;
+
+ ia->read.in.fh = ff->fh;
+ ia->read.in.offset = pos;
+ ia->read.in.size = count;
+ ia->read.in.flags = file->f_flags;
+ args->opcode = opcode;
+ args->nodeid = ff->nodeid;
+ args->in_numargs = 1;
+ args->in_args[0].size = sizeof(ia->read.in);
+ args->in_args[0].value = &ia->read.in;
+ args->out_argvar = true;
+ args->out_numargs = 1;
+ args->out_args[0].size = count;
+}
+
static void fuse_release_user_pages(struct fuse_req *req, bool should_dirty)
{
unsigned i;
@@ -732,16 +759,19 @@ static void fuse_short_read(struct inode *inode, u64 attr_ver, size_t num_read,
static int fuse_do_readpage(struct file *file, struct page *page)
{
- struct kiocb iocb;
- struct fuse_io_priv io;
struct inode *inode = page->mapping->host;
struct fuse_conn *fc = get_fuse_conn(inode);
- struct fuse_req *req;
- size_t num_read;
loff_t pos = page_offset(page);
- size_t count = PAGE_SIZE;
+ struct fuse_page_desc desc = { .length = PAGE_SIZE };
+ struct fuse_io_args ia = {
+ .ap.args.page_zeroing = true,
+ .ap.args.out_pages = true,
+ .ap.num_pages = 1,
+ .ap.pages = &page,
+ .ap.descs = &desc,
+ };
+ ssize_t res;
u64 attr_ver;
- int err;
/*
* Page writeback can extend beyond the lifetime of the
@@ -750,36 +780,22 @@ static int fuse_do_readpage(struct file *file, struct page *page)
*/
fuse_wait_on_page_writeback(inode, page->index);
- req = fuse_get_req(fc, 1);
- if (IS_ERR(req))
- return PTR_ERR(req);
-
attr_ver = fuse_get_attr_version(fc);
- req->out.page_zeroing = 1;
- req->out.argpages = 1;
- req->num_pages = 1;
- req->pages[0] = page;
- req->page_descs[0].length = count;
- init_sync_kiocb(&iocb, file);
- io = (struct fuse_io_priv) FUSE_IO_PRIV_SYNC(&iocb);
- num_read = fuse_send_read(req, &io, pos, count, NULL);
- err = req->out.h.error;
-
- if (!err) {
- /*
- * Short read means EOF. If file size is larger, truncate it
- */
- if (num_read < count)
- fuse_short_read(inode, attr_ver, num_read, req->pages,
- req->num_pages);
-
- SetPageUptodate(page);
- }
+ fuse_read_args_fill(&ia, file, pos, desc.length, FUSE_READ);
+ res = fuse_simple_request(fc, &ia.ap.args);
+ if (res < 0)
+ return res;
+ /*
+ * Short read means EOF. If file size is larger, truncate it
+ */
+ if (res < desc.length)
+ fuse_short_read(inode, attr_ver, res, ia.ap.pages,
+ ia.ap.num_pages);
- fuse_put_request(fc, req);
+ SetPageUptodate(page);
- return err;
+ return 0;
}
static int fuse_readpage(struct file *file, struct page *page)