fuse: convert direct_io to simple api
Change of semantics in fuse_async_req_send/fuse_send_(read|write): these can now return error, in which case the 'end' callback isn't called, so the fuse_io_args object needs to be freed. Added verification that the return value is sane (less than or equal to the requested read/write size). Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
This commit is contained in:
Miklos Szeredi
parent
1259728731
commit
45ac96ed7c
227
fs/fuse/file.c
227
fs/fuse/file.c
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@ -563,6 +563,7 @@ struct fuse_io_args {
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} write;
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};
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struct fuse_args_pages ap;
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struct fuse_io_priv *io;
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};
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void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
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@ -585,15 +586,15 @@ void fuse_read_args_fill(struct fuse_io_args *ia, struct file *file, loff_t pos,
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args->out_args[0].size = count;
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}
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static void fuse_release_user_pages(struct fuse_req *req, bool should_dirty)
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static void fuse_release_user_pages(struct fuse_args_pages *ap,
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bool should_dirty)
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{
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unsigned i;
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unsigned int i;
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for (i = 0; i < req->num_pages; i++) {
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struct page *page = req->pages[i];
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for (i = 0; i < ap->num_pages; i++) {
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if (should_dirty)
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set_page_dirty_lock(page);
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put_page(page);
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set_page_dirty_lock(ap->pages[i]);
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put_page(ap->pages[i]);
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}
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}
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@ -663,64 +664,94 @@ static void fuse_aio_complete(struct fuse_io_priv *io, int err, ssize_t pos)
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kref_put(&io->refcnt, fuse_io_release);
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}
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static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_req *req)
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static struct fuse_io_args *fuse_io_alloc(struct fuse_io_priv *io,
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unsigned int npages)
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{
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struct fuse_io_priv *io = req->io;
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ssize_t pos = -1;
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struct fuse_io_args *ia;
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fuse_release_user_pages(req, io->should_dirty);
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if (io->write) {
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if (req->misc.write.in.size != req->misc.write.out.size)
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pos = req->misc.write.in.offset - io->offset +
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req->misc.write.out.size;
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} else {
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if (req->misc.read.in.size != req->out.args[0].size)
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pos = req->misc.read.in.offset - io->offset +
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req->out.args[0].size;
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ia = kzalloc(sizeof(*ia), GFP_KERNEL);
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if (ia) {
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ia->io = io;
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ia->ap.pages = fuse_pages_alloc(npages, GFP_KERNEL,
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&ia->ap.descs);
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if (!ia->ap.pages) {
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kfree(ia);
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ia = NULL;
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}
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}
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fuse_aio_complete(io, req->out.h.error, pos);
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return ia;
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}
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static size_t fuse_async_req_send(struct fuse_conn *fc, struct fuse_req *req,
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size_t num_bytes, struct fuse_io_priv *io)
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static void fuse_io_free(struct fuse_io_args *ia)
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{
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kfree(ia->ap.pages);
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kfree(ia);
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}
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static void fuse_aio_complete_req(struct fuse_conn *fc, struct fuse_args *args,
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int err)
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{
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struct fuse_io_args *ia = container_of(args, typeof(*ia), ap.args);
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struct fuse_io_priv *io = ia->io;
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ssize_t pos = -1;
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fuse_release_user_pages(&ia->ap, io->should_dirty);
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if (err) {
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/* Nothing */
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} else if (io->write) {
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if (ia->write.out.size > ia->write.in.size) {
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err = -EIO;
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} else if (ia->write.in.size != ia->write.out.size) {
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pos = ia->write.in.offset - io->offset +
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ia->write.out.size;
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}
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} else {
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u32 outsize = args->out_args[0].size;
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if (ia->read.in.size != outsize)
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pos = ia->read.in.offset - io->offset + outsize;
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}
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fuse_aio_complete(io, err, pos);
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fuse_io_free(ia);
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}
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static ssize_t fuse_async_req_send(struct fuse_conn *fc,
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struct fuse_io_args *ia, size_t num_bytes)
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{
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ssize_t err;
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struct fuse_io_priv *io = ia->io;
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spin_lock(&io->lock);
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kref_get(&io->refcnt);
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io->size += num_bytes;
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io->reqs++;
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spin_unlock(&io->lock);
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req->io = io;
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req->end = fuse_aio_complete_req;
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ia->ap.args.end = fuse_aio_complete_req;
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err = fuse_simple_background(fc, &ia->ap.args, GFP_KERNEL);
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__fuse_get_request(req);
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fuse_request_send_background(fc, req);
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return num_bytes;
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return err ?: num_bytes;
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}
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static size_t fuse_send_read(struct fuse_req *req, struct fuse_io_priv *io,
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loff_t pos, size_t count, fl_owner_t owner)
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static ssize_t fuse_send_read(struct fuse_io_args *ia, loff_t pos, size_t count,
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fl_owner_t owner)
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{
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struct file *file = io->iocb->ki_filp;
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struct file *file = ia->io->iocb->ki_filp;
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struct fuse_file *ff = file->private_data;
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struct fuse_conn *fc = ff->fc;
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fuse_read_fill(req, file, pos, count, FUSE_READ);
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fuse_read_args_fill(ia, file, pos, count, FUSE_READ);
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if (owner != NULL) {
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struct fuse_read_in *inarg = &req->misc.read.in;
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inarg->read_flags |= FUSE_READ_LOCKOWNER;
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inarg->lock_owner = fuse_lock_owner_id(fc, owner);
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ia->read.in.read_flags |= FUSE_READ_LOCKOWNER;
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ia->read.in.lock_owner = fuse_lock_owner_id(fc, owner);
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}
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if (io->async)
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return fuse_async_req_send(fc, req, count, io);
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if (ia->io->async)
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return fuse_async_req_send(fc, ia, count);
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fuse_request_send(fc, req);
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return req->out.args[0].size;
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return fuse_simple_request(fc, &ia->ap.args);
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}
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static void fuse_read_update_size(struct inode *inode, loff_t size,
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@ -1041,27 +1072,31 @@ static unsigned int fuse_write_flags(struct kiocb *iocb)
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return flags;
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}
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static size_t fuse_send_write(struct fuse_req *req, struct fuse_io_priv *io,
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loff_t pos, size_t count, fl_owner_t owner)
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static ssize_t fuse_send_write(struct fuse_io_args *ia, loff_t pos,
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size_t count, fl_owner_t owner)
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{
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struct kiocb *iocb = io->iocb;
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struct kiocb *iocb = ia->io->iocb;
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struct file *file = iocb->ki_filp;
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struct fuse_file *ff = file->private_data;
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struct fuse_conn *fc = ff->fc;
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struct fuse_write_in *inarg = &req->misc.write.in;
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struct fuse_write_in *inarg = &ia->write.in;
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ssize_t err;
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fuse_write_fill(req, ff, pos, count);
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fuse_write_args_fill(ia, ff, pos, count);
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inarg->flags = fuse_write_flags(iocb);
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if (owner != NULL) {
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inarg->write_flags |= FUSE_WRITE_LOCKOWNER;
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inarg->lock_owner = fuse_lock_owner_id(fc, owner);
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}
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if (io->async)
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return fuse_async_req_send(fc, req, count, io);
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if (ia->io->async)
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return fuse_async_req_send(fc, ia, count);
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fuse_request_send(fc, req);
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return req->misc.write.out.size;
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err = fuse_simple_request(fc, &ia->ap.args);
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if (!err && ia->write.out.size > count)
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err = -EIO;
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return err ?: ia->write.out.size;
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}
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bool fuse_write_update_size(struct inode *inode, loff_t pos)
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@ -1347,8 +1382,9 @@ static inline size_t fuse_get_frag_size(const struct iov_iter *ii,
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return min(iov_iter_single_seg_count(ii), max_size);
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}
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static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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size_t *nbytesp, int write)
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static int fuse_get_user_pages(struct fuse_args_pages *ap, struct iov_iter *ii,
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size_t *nbytesp, int write,
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unsigned int max_pages)
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{
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size_t nbytes = 0; /* # bytes already packed in req */
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ssize_t ret = 0;
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@ -1359,21 +1395,21 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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size_t frag_size = fuse_get_frag_size(ii, *nbytesp);
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if (write)
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req->in.args[1].value = (void *) user_addr;
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ap->args.in_args[1].value = (void *) user_addr;
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else
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req->out.args[0].value = (void *) user_addr;
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ap->args.out_args[0].value = (void *) user_addr;
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iov_iter_advance(ii, frag_size);
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*nbytesp = frag_size;
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return 0;
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}
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while (nbytes < *nbytesp && req->num_pages < req->max_pages) {
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while (nbytes < *nbytesp && ap->num_pages < max_pages) {
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unsigned npages;
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size_t start;
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ret = iov_iter_get_pages(ii, &req->pages[req->num_pages],
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ret = iov_iter_get_pages(ii, &ap->pages[ap->num_pages],
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*nbytesp - nbytes,
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req->max_pages - req->num_pages,
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max_pages - ap->num_pages,
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&start);
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if (ret < 0)
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break;
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@ -1384,19 +1420,18 @@ static int fuse_get_user_pages(struct fuse_req *req, struct iov_iter *ii,
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ret += start;
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npages = (ret + PAGE_SIZE - 1) / PAGE_SIZE;
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req->page_descs[req->num_pages].offset = start;
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fuse_page_descs_length_init(req->page_descs, req->num_pages,
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npages);
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ap->descs[ap->num_pages].offset = start;
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fuse_page_descs_length_init(ap->descs, ap->num_pages, npages);
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req->num_pages += npages;
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req->page_descs[req->num_pages - 1].length -=
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ap->num_pages += npages;
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ap->descs[ap->num_pages - 1].length -=
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(PAGE_SIZE - ret) & (PAGE_SIZE - 1);
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}
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if (write)
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req->in.argpages = 1;
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ap->args.in_pages = 1;
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else
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req->out.argpages = 1;
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ap->args.out_pages = 1;
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*nbytesp = nbytes;
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@ -1418,17 +1453,16 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
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pgoff_t idx_from = pos >> PAGE_SHIFT;
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pgoff_t idx_to = (pos + count - 1) >> PAGE_SHIFT;
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ssize_t res = 0;
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struct fuse_req *req;
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int err = 0;
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struct fuse_io_args *ia;
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unsigned int max_pages;
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if (io->async)
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req = fuse_get_req_for_background(fc, iov_iter_npages(iter,
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fc->max_pages));
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else
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req = fuse_get_req(fc, iov_iter_npages(iter, fc->max_pages));
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if (IS_ERR(req))
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return PTR_ERR(req);
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max_pages = iov_iter_npages(iter, fc->max_pages);
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ia = fuse_io_alloc(io, max_pages);
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if (!ia)
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return -ENOMEM;
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ia->io = io;
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if (!cuse && fuse_range_is_writeback(inode, idx_from, idx_to)) {
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if (!write)
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inode_lock(inode);
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@ -1439,54 +1473,49 @@ ssize_t fuse_direct_io(struct fuse_io_priv *io, struct iov_iter *iter,
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io->should_dirty = !write && iter_is_iovec(iter);
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while (count) {
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size_t nres;
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ssize_t nres;
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fl_owner_t owner = current->files;
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size_t nbytes = min(count, nmax);
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err = fuse_get_user_pages(req, iter, &nbytes, write);
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err = fuse_get_user_pages(&ia->ap, iter, &nbytes, write,
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max_pages);
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if (err && !nbytes)
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break;
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if (write) {
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if (!capable(CAP_FSETID)) {
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struct fuse_write_in *inarg;
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if (!capable(CAP_FSETID))
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ia->write.in.write_flags |= FUSE_WRITE_KILL_PRIV;
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inarg = &req->misc.write.in;
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inarg->write_flags |= FUSE_WRITE_KILL_PRIV;
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}
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nres = fuse_send_write(req, io, pos, nbytes, owner);
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nres = fuse_send_write(ia, pos, nbytes, owner);
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} else {
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nres = fuse_send_read(req, io, pos, nbytes, owner);
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nres = fuse_send_read(ia, pos, nbytes, owner);
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}
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if (!io->async)
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fuse_release_user_pages(req, io->should_dirty);
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if (req->out.h.error) {
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err = req->out.h.error;
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break;
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} else if (nres > nbytes) {
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res = 0;
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err = -EIO;
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if (!io->async || nres < 0) {
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fuse_release_user_pages(&ia->ap, io->should_dirty);
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fuse_io_free(ia);
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}
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ia = NULL;
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if (nres < 0) {
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err = nres;
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break;
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}
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WARN_ON(nres > nbytes);
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count -= nres;
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res += nres;
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pos += nres;
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if (nres != nbytes)
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break;
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if (count) {
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fuse_put_request(fc, req);
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if (io->async)
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req = fuse_get_req_for_background(fc,
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iov_iter_npages(iter, fc->max_pages));
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else
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req = fuse_get_req(fc, iov_iter_npages(iter,
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fc->max_pages));
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if (IS_ERR(req))
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max_pages = iov_iter_npages(iter, fc->max_pages);
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ia = fuse_io_alloc(io, max_pages);
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if (!ia)
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break;
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}
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}
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if (!IS_ERR(req))
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fuse_put_request(fc, req);
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if (ia)
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fuse_io_free(ia);
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if (res > 0)
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*ppos = pos;
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