diff options
Diffstat (limited to 'fs/fuse/dev.c')
| -rw-r--r-- | fs/fuse/dev.c | 156 |
1 files changed, 147 insertions, 9 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 6e07696308dc..cf8d28d1fbad 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -251,6 +251,20 @@ static void queue_request(struct fuse_conn *fc, struct fuse_req *req) kill_fasync(&fc->fasync, SIGIO, POLL_IN); } +void fuse_queue_forget(struct fuse_conn *fc, struct fuse_forget_link *forget, + u64 nodeid, u64 nlookup) +{ + forget->forget_one.nodeid = nodeid; + forget->forget_one.nlookup = nlookup; + + spin_lock(&fc->lock); + fc->forget_list_tail->next = forget; + fc->forget_list_tail = forget; + wake_up(&fc->waitq); + kill_fasync(&fc->fasync, SIGIO, POLL_IN); + spin_unlock(&fc->lock); +} + static void flush_bg_queue(struct fuse_conn *fc) { while (fc->active_background < fc->max_background && @@ -438,12 +452,6 @@ static void fuse_request_send_nowait(struct fuse_conn *fc, struct fuse_req *req) } } -void fuse_request_send_noreply(struct fuse_conn *fc, struct fuse_req *req) -{ - req->isreply = 0; - fuse_request_send_nowait(fc, req); -} - void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req) { req->isreply = 1; @@ -896,9 +904,15 @@ static int fuse_copy_args(struct fuse_copy_state *cs, unsigned numargs, return err; } +static int forget_pending(struct fuse_conn *fc) +{ + return fc->forget_list_head.next != NULL; +} + static int request_pending(struct fuse_conn *fc) { - return !list_empty(&fc->pending) || !list_empty(&fc->interrupts); + return !list_empty(&fc->pending) || !list_empty(&fc->interrupts) || + forget_pending(fc); } /* Wait until a request is available on the pending list */ @@ -960,6 +974,120 @@ __releases(fc->lock) return err ? err : reqsize; } +static struct fuse_forget_link *dequeue_forget(struct fuse_conn *fc, + unsigned max, + unsigned *countp) +{ + struct fuse_forget_link *head = fc->forget_list_head.next; + struct fuse_forget_link **newhead = &head; + unsigned count; + + for (count = 0; *newhead != NULL && count < max; count++) + newhead = &(*newhead)->next; + + fc->forget_list_head.next = *newhead; + *newhead = NULL; + if (fc->forget_list_head.next == NULL) + fc->forget_list_tail = &fc->forget_list_head; + + if (countp != NULL) + *countp = count; + + return head; +} + +static int fuse_read_single_forget(struct fuse_conn *fc, + struct fuse_copy_state *cs, + size_t nbytes) +__releases(fc->lock) +{ + int err; + struct fuse_forget_link *forget = dequeue_forget(fc, 1, NULL); + struct fuse_forget_in arg = { + .nlookup = forget->forget_one.nlookup, + }; + struct fuse_in_header ih = { + .opcode = FUSE_FORGET, + .nodeid = forget->forget_one.nodeid, + .unique = fuse_get_unique(fc), + .len = sizeof(ih) + sizeof(arg), + }; + + spin_unlock(&fc->lock); + kfree(forget); + if (nbytes < ih.len) + return -EINVAL; + + err = fuse_copy_one(cs, &ih, sizeof(ih)); + if (!err) + err = fuse_copy_one(cs, &arg, sizeof(arg)); + fuse_copy_finish(cs); + + if (err) + return err; + + return ih.len; +} + +static int fuse_read_batch_forget(struct fuse_conn *fc, + struct fuse_copy_state *cs, size_t nbytes) +__releases(fc->lock) +{ + int err; + unsigned max_forgets; + unsigned count; + struct fuse_forget_link *head; + struct fuse_batch_forget_in arg = { .count = 0 }; + struct fuse_in_header ih = { + .opcode = FUSE_BATCH_FORGET, + .unique = fuse_get_unique(fc), + .len = sizeof(ih) + sizeof(arg), + }; + + if (nbytes < ih.len) { + spin_unlock(&fc->lock); + return -EINVAL; + } + + max_forgets = (nbytes - ih.len) / sizeof(struct fuse_forget_one); + head = dequeue_forget(fc, max_forgets, &count); + spin_unlock(&fc->lock); + + arg.count = count; + ih.len += count * sizeof(struct fuse_forget_one); + err = fuse_copy_one(cs, &ih, sizeof(ih)); + if (!err) + err = fuse_copy_one(cs, &arg, sizeof(arg)); + + while (head) { + struct fuse_forget_link *forget = head; + + if (!err) { + err = fuse_copy_one(cs, &forget->forget_one, + sizeof(forget->forget_one)); + } + head = forget->next; + kfree(forget); + } + + fuse_copy_finish(cs); + + if (err) + return err; + + return ih.len; +} + +static int fuse_read_forget(struct fuse_conn *fc, struct fuse_copy_state *cs, + size_t nbytes) +__releases(fc->lock) +{ + if (fc->minor < 16 || fc->forget_list_head.next->next == NULL) + return fuse_read_single_forget(fc, cs, nbytes); + else + return fuse_read_batch_forget(fc, cs, nbytes); +} + /* * Read a single request into the userspace filesystem's buffer. This * function waits until a request is available, then removes it from @@ -998,6 +1126,14 @@ static ssize_t fuse_dev_do_read(struct fuse_conn *fc, struct file *file, return fuse_read_interrupt(fc, cs, nbytes, req); } + if (forget_pending(fc)) { + if (list_empty(&fc->pending) || fc->forget_batch-- > 0) + return fuse_read_forget(fc, cs, nbytes); + + if (fc->forget_batch <= -8) + fc->forget_batch = 16; + } + req = list_entry(fc->pending.next, struct fuse_req, list); req->state = FUSE_REQ_READING; list_move(&req->list, &fc->io); @@ -1090,7 +1226,7 @@ static ssize_t fuse_dev_splice_read(struct file *in, loff_t *ppos, if (!fc) return -EPERM; - bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); + bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); if (!bufs) return -ENOMEM; @@ -1626,7 +1762,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe, if (!fc) return -EPERM; - bufs = kmalloc(pipe->buffers * sizeof (struct pipe_buffer), GFP_KERNEL); + bufs = kmalloc(pipe->buffers * sizeof(struct pipe_buffer), GFP_KERNEL); if (!bufs) return -ENOMEM; @@ -1770,6 +1906,8 @@ __acquires(fc->lock) flush_bg_queue(fc); end_requests(fc, &fc->pending); end_requests(fc, &fc->processing); + while (forget_pending(fc)) + kfree(dequeue_forget(fc, 1, NULL)); } /* |