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fuse: covert readpage to simple api

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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>
This commit is contained in:
Miklos Szeredi 2019-09-10 15:04:09 +02:00
parent a0d45d84f4
commit 00793ca5d4
1 changed files with 48 additions and 32 deletions
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72
fs/fuse/file.c
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@ -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) {
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 (num_read < count)
fuse_short_read(inode, attr_ver, num_read, req->pages,
req->num_pages);
if (res < desc.length)
fuse_short_read(inode, attr_ver, res, ia.ap.pages,
ia.ap.num_pages);
SetPageUptodate(page);
}
fuse_put_request(fc, req);
return err;
return 0;
}
static int fuse_readpage(struct file *file, struct page *page)