diff options
| -rw-r--r-- | fs/fuse/dev.c | 27 | ||||
| -rw-r--r-- | include/linux/fuse.h | 4 |
2 files changed, 29 insertions, 2 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index 225388f54ae7..ffd670bb8c8c 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -816,6 +816,15 @@ static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov, return err; } +static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code, + unsigned int size, struct fuse_copy_state *cs) +{ + switch (code) { + default: + return -EINVAL; + } +} + /* Look up request on processing list by unique ID */ static struct fuse_req *request_find(struct fuse_conn *fc, u64 unique) { @@ -879,9 +888,23 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov, err = fuse_copy_one(&cs, &oh, sizeof(oh)); if (err) goto err_finish; + + err = -EINVAL; + if (oh.len != nbytes) + goto err_finish; + + /* + * Zero oh.unique indicates unsolicited notification message + * and error contains notification code. + */ + if (!oh.unique) { + err = fuse_notify(fc, oh.error, nbytes - sizeof(oh), &cs); + fuse_copy_finish(&cs); + return err ? err : nbytes; + } + err = -EINVAL; - if (!oh.unique || oh.error <= -1000 || oh.error > 0 || - oh.len != nbytes) + if (oh.error <= -1000 || oh.error > 0) goto err_finish; spin_lock(&fc->lock); diff --git a/include/linux/fuse.h b/include/linux/fuse.h index 608e300ae883..abde9949e2c0 100644 --- a/include/linux/fuse.h +++ b/include/linux/fuse.h @@ -203,6 +203,10 @@ enum fuse_opcode { FUSE_IOCTL = 39, }; +enum fuse_notify_code { + FUSE_NOTIFY_CODE_MAX, +}; + /* The read buffer is required to be at least 8k, but may be much larger */ #define FUSE_MIN_READ_BUFFER 8192 |