diff options
Diffstat (limited to 'fs/fuse/cuse.c')
| -rw-r--r-- | fs/fuse/cuse.c | 55 |
1 files changed, 34 insertions, 21 deletions
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c index 3426521f3205..aef34b1e635e 100644 --- a/fs/fuse/cuse.c +++ b/fs/fuse/cuse.c @@ -38,6 +38,7 @@ #include <linux/device.h> #include <linux/file.h> #include <linux/fs.h> +#include <linux/aio.h> #include <linux/kdev_t.h> #include <linux/kthread.h> #include <linux/list.h> @@ -45,7 +46,6 @@ #include <linux/miscdevice.h> #include <linux/mutex.h> #include <linux/slab.h> -#include <linux/spinlock.h> #include <linux/stat.h> #include <linux/module.h> @@ -63,7 +63,7 @@ struct cuse_conn { bool unrestricted_ioctl; }; -static DEFINE_SPINLOCK(cuse_lock); /* protects cuse_conntbl */ +static DEFINE_MUTEX(cuse_lock); /* protects registration */ static struct list_head cuse_conntbl[CUSE_CONNTBL_LEN]; static struct class *cuse_class; @@ -92,19 +92,24 @@ static ssize_t cuse_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) { loff_t pos = 0; + struct iovec iov = { .iov_base = buf, .iov_len = count }; + struct fuse_io_priv io = { .async = 0, .file = file }; - return fuse_direct_io(file, buf, count, &pos, 0); + return fuse_direct_io(&io, &iov, 1, count, &pos, 0); } static ssize_t cuse_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) { loff_t pos = 0; + struct iovec iov = { .iov_base = (void __user *)buf, .iov_len = count }; + struct fuse_io_priv io = { .async = 0, .file = file }; + /* * No locking or generic_write_checks(), the server is * responsible for locking and sanity checks. */ - return fuse_direct_io(file, buf, count, &pos, 1); + return fuse_direct_io(&io, &iov, 1, count, &pos, 1); } static int cuse_open(struct inode *inode, struct file *file) @@ -114,14 +119,14 @@ static int cuse_open(struct inode *inode, struct file *file) int rc; /* look up and get the connection */ - spin_lock(&cuse_lock); + mutex_lock(&cuse_lock); list_for_each_entry(pos, cuse_conntbl_head(devt), list) if (pos->dev->devt == devt) { fuse_conn_get(&pos->fc); cc = pos; break; } - spin_unlock(&cuse_lock); + mutex_unlock(&cuse_lock); /* dead? */ if (!cc) @@ -267,7 +272,7 @@ static int cuse_parse_one(char **pp, char *end, char **keyp, char **valp) static int cuse_parse_devinfo(char *p, size_t len, struct cuse_devinfo *devinfo) { char *end = p + len; - char *key, *val; + char *uninitialized_var(key), *uninitialized_var(val); int rc; while (true) { @@ -305,14 +310,14 @@ static void cuse_gendev_release(struct device *dev) */ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) { - struct cuse_conn *cc = fc_to_cc(fc); + struct cuse_conn *cc = fc_to_cc(fc), *pos; struct cuse_init_out *arg = req->out.args[0].value; struct page *page = req->pages[0]; struct cuse_devinfo devinfo = { }; struct device *dev; struct cdev *cdev; dev_t devt; - int rc; + int rc, i; if (req->out.h.error || arg->major != FUSE_KERNEL_VERSION || arg->minor < 11) { @@ -356,15 +361,24 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) dev_set_drvdata(dev, cc); dev_set_name(dev, "%s", devinfo.name); + mutex_lock(&cuse_lock); + + /* make sure the device-name is unique */ + for (i = 0; i < CUSE_CONNTBL_LEN; ++i) { + list_for_each_entry(pos, &cuse_conntbl[i], list) + if (!strcmp(dev_name(pos->dev), dev_name(dev))) + goto err_unlock; + } + rc = device_add(dev); if (rc) - goto err_device; + goto err_unlock; /* register cdev */ rc = -ENOMEM; cdev = cdev_alloc(); if (!cdev) - goto err_device; + goto err_unlock; cdev->owner = THIS_MODULE; cdev->ops = &cuse_frontend_fops; @@ -377,9 +391,8 @@ static void cuse_process_init_reply(struct fuse_conn *fc, struct fuse_req *req) cc->cdev = cdev; /* make the device available */ - spin_lock(&cuse_lock); list_add(&cc->list, cuse_conntbl_head(devt)); - spin_unlock(&cuse_lock); + mutex_unlock(&cuse_lock); /* announce device availability */ dev_set_uevent_suppress(dev, 0); @@ -391,12 +404,13 @@ out: err_cdev: cdev_del(cdev); -err_device: +err_unlock: + mutex_unlock(&cuse_lock); put_device(dev); err_region: unregister_chrdev_region(devt, 1); err: - fc->conn_error = 1; + fuse_conn_kill(fc); goto out; } @@ -411,7 +425,7 @@ static int cuse_send_init(struct cuse_conn *cc) BUILD_BUG_ON(CUSE_INIT_INFO_MAX > PAGE_SIZE); - req = fuse_get_req(fc); + req = fuse_get_req_for_background(fc, 1); if (IS_ERR(req)) { rc = PTR_ERR(req); goto err; @@ -441,6 +455,7 @@ static int cuse_send_init(struct cuse_conn *cc) req->out.argvar = 1; req->out.argpages = 1; req->pages[0] = page; + req->page_descs[0].length = req->out.args[1].size; req->num_pages = 1; req->end = cuse_process_init_reply; fuse_request_send_background(fc, req); @@ -492,7 +507,7 @@ static int cuse_channel_open(struct inode *inode, struct file *file) cc->fc.release = cuse_fc_release; cc->fc.connected = 1; - cc->fc.blocked = 0; + cc->fc.initialized = 1; rc = cuse_send_init(cc); if (rc) { fuse_conn_put(&cc->fc); @@ -520,9 +535,9 @@ static int cuse_channel_release(struct inode *inode, struct file *file) int rc; /* remove from the conntbl, no more access from this point on */ - spin_lock(&cuse_lock); + mutex_lock(&cuse_lock); list_del_init(&cc->list); - spin_unlock(&cuse_lock); + mutex_unlock(&cuse_lock); /* remove device */ if (cc->dev) @@ -532,8 +547,6 @@ static int cuse_channel_release(struct inode *inode, struct file *file) cdev_del(cc->cdev); } - /* kill connection and shutdown channel */ - fuse_conn_kill(&cc->fc); rc = fuse_dev_release(inode, file); /* puts the base reference */ return rc; |