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author | Miklos Szeredi <mszeredi@suse.cz> | 2015-07-01 14:26:08 (GMT) |
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committer | Miklos Szeredi <mszeredi@suse.cz> | 2015-07-01 14:26:08 (GMT) |
commit | cc080e9e9be16ccf26135d366d7d2b65209f1d56 (patch) | |
tree | 7983dc5634462fb3ee0306827a1dd68f137cc316 /fs/fuse/dev.c | |
parent | 00c570f4ba43ae73b41fa0a2269c3b0ac20386ef (diff) | |
download | linux-cc080e9e9be16ccf26135d366d7d2b65209f1d56.tar.xz |
fuse: introduce per-instance fuse_dev structure
Allow fuse device clones to refer to be distinguished. This patch just
adds the infrastructure by associating a separate "struct fuse_dev" with
each clone.
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
Diffstat (limited to 'fs/fuse/dev.c')
-rw-r--r-- | fs/fuse/dev.c | 70 |
1 files changed, 42 insertions, 28 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index d405c1f..99e94584 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -25,13 +25,13 @@ MODULE_ALIAS("devname:fuse"); static struct kmem_cache *fuse_req_cachep; -static struct fuse_conn *fuse_get_conn(struct file *file) +static struct fuse_dev *fuse_get_dev(struct file *file) { /* * Lockless access is OK, because file->private data is set * once during mount and is valid until the file is released. */ - return file->private_data; + return ACCESS_ONCE(file->private_data); } static void fuse_request_init(struct fuse_req *req, struct page **pages, @@ -1348,8 +1348,9 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to) { struct fuse_copy_state cs; struct file *file = iocb->ki_filp; - struct fuse_conn *fc = fuse_get_conn(file); - if (!fc) + struct fuse_dev *fud = fuse_get_dev(file); + + if (!fud) return -EPERM; if (!iter_is_iovec(to)) @@ -1357,7 +1358,7 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, struct iov_iter *to) fuse_copy_init(&cs, 1, to); - return fuse_dev_do_read(fc, file, &cs, iov_iter_count(to)); + return fuse_dev_do_read(fud->fc, file, &cs, iov_iter_count(to)); } static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, @@ -1369,8 +1370,9 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, int do_wakeup = 0; struct pipe_buffer *bufs; struct fuse_copy_state cs; - struct fuse_conn *fc = fuse_get_conn(in); - if (!fc) + struct fuse_dev *fud = fuse_get_dev(in); + + if (!fud) return -EPERM; bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); @@ -1380,7 +1382,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, fuse_copy_init(&cs, 1, NULL); cs.pipebufs = bufs; cs.pipe = pipe; - ret = fuse_dev_do_read(fc, in, &cs, len); + ret = fuse_dev_do_read(fud->fc, in, &cs, len); if (ret < 0) goto out; @@ -1954,8 +1956,9 @@ static ssize_t fuse_dev_do_write(struct fuse_conn *fc, static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from) { struct fuse_copy_state cs; - struct fuse_conn *fc = fuse_get_conn(iocb->ki_filp); - if (!fc) + struct fuse_dev *fud = fuse_get_dev(iocb->ki_filp); + + if (!fud) return -EPERM; if (!iter_is_iovec(from)) @@ -1963,7 +1966,7 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, struct iov_iter *from) fuse_copy_init(&cs, 0, from); - return fuse_dev_do_write(fc, &cs, iov_iter_count(from)); + return fuse_dev_do_write(fud->fc, &cs, iov_iter_count(from)); } static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, @@ -1974,12 +1977,12 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, unsigned idx; struct pipe_buffer *bufs; struct fuse_copy_state cs; - struct fuse_conn *fc; + struct fuse_dev *fud; size_t rem; ssize_t ret; - fc = fuse_get_conn(out); - if (!fc) + fud = fuse_get_dev(out); + if (!fud) return -EPERM; bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); @@ -2034,7 +2037,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, if (flags & SPLICE_F_MOVE) cs.move_pages = 1; - ret = fuse_dev_do_write(fc, &cs, len); + ret = fuse_dev_do_write(fud->fc, &cs, len); for (idx = 0; idx < nbuf; idx++) { struct pipe_buffer *buf = &bufs[idx]; @@ -2049,11 +2052,12 @@ static unsigned fuse_dev_poll(struct file *file, poll_table *wait) { unsigned mask = POLLOUT | POLLWRNORM; struct fuse_iqueue *fiq; - struct fuse_conn *fc = fuse_get_conn(file); - if (!fc) + struct fuse_dev *fud = fuse_get_dev(file); + + if (!fud) return POLLERR; - fiq = &fc->iq; + fiq = &fud->fc->iq; poll_wait(file, &fiq->waitq, wait); spin_lock(&fiq->waitq.lock); @@ -2175,12 +2179,15 @@ EXPORT_SYMBOL_GPL(fuse_abort_conn); int fuse_dev_release(struct inode *inode, struct file *file) { - struct fuse_conn *fc = fuse_get_conn(file); - if (fc) { + struct fuse_dev *fud = fuse_get_dev(file); + + if (fud) { + struct fuse_conn *fc = fud->fc; + WARN_ON(!list_empty(&fc->pq.io)); WARN_ON(fc->iq.fasync != NULL); fuse_abort_conn(fc); - fuse_conn_put(fc); + fuse_dev_free(fud); } return 0; @@ -2189,20 +2196,27 @@ EXPORT_SYMBOL_GPL(fuse_dev_release); static int fuse_dev_fasync(int fd, struct file *file, int on) { - struct fuse_conn *fc = fuse_get_conn(file); - if (!fc) + struct fuse_dev *fud = fuse_get_dev(file); + + if (!fud) return -EPERM; /* No locking - fasync_helper does its own locking */ - return fasync_helper(fd, file, on, &fc->iq.fasync); + return fasync_helper(fd, file, on, &fud->fc->iq.fasync); } static int fuse_device_clone(struct fuse_conn *fc, struct file *new) { + struct fuse_dev *fud; + if (new->private_data) return -EINVAL; - new->private_data = fuse_conn_get(fc); + fud = fuse_dev_alloc(fc); + if (!fud) + return -ENOMEM; + + new->private_data = fud; return 0; } @@ -2221,11 +2235,11 @@ static long fuse_dev_ioctl(struct file *file, unsigned int cmd, err = -EINVAL; if (old) { - struct fuse_conn *fc = fuse_get_conn(old); + struct fuse_dev *fud = fuse_get_dev(old); - if (fc) { + if (fud) { mutex_lock(&fuse_mutex); - err = fuse_device_clone(fc, file); + err = fuse_device_clone(fud->fc, file); mutex_unlock(&fuse_mutex); } fput(old); 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