diff options
Diffstat (limited to 'fs/cachefiles')
| -rw-r--r-- | fs/cachefiles/ondemand.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/fs/cachefiles/ondemand.c b/fs/cachefiles/ondemand.c index bb94ef6a6f61..898fab68332b 100644 --- a/fs/cachefiles/ondemand.c +++ b/fs/cachefiles/ondemand.c @@ -82,12 +82,12 @@ static loff_t cachefiles_ondemand_fd_llseek(struct file *filp, loff_t pos, } static long cachefiles_ondemand_fd_ioctl(struct file *filp, unsigned int ioctl, - unsigned long arg) + unsigned long id) { struct cachefiles_object *object = filp->private_data; struct cachefiles_cache *cache = object->volume->cache; struct cachefiles_req *req; - unsigned long id; + XA_STATE(xas, &cache->reqs, id); if (ioctl != CACHEFILES_IOC_READ_COMPLETE) return -EINVAL; @@ -95,10 +95,15 @@ static long cachefiles_ondemand_fd_ioctl(struct file *filp, unsigned int ioctl, if (!test_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags)) return -EOPNOTSUPP; - id = arg; - req = xa_erase(&cache->reqs, id); - if (!req) + xa_lock(&cache->reqs); + req = xas_load(&xas); + if (!req || req->msg.opcode != CACHEFILES_OP_READ || + req->object != object) { + xa_unlock(&cache->reqs); return -EINVAL; + } + xas_store(&xas, NULL); + xa_unlock(&cache->reqs); trace_cachefiles_ondemand_cread(object, id); complete(&req->done); @@ -126,6 +131,7 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args) unsigned long id; long size; int ret; + XA_STATE(xas, &cache->reqs, 0); if (!test_bit(CACHEFILES_ONDEMAND_MODE, &cache->flags)) return -EOPNOTSUPP; @@ -149,9 +155,16 @@ int cachefiles_ondemand_copen(struct cachefiles_cache *cache, char *args) if (ret) return ret; - req = xa_erase(&cache->reqs, id); - if (!req) + xa_lock(&cache->reqs); + xas.xa_index = id; + req = xas_load(&xas); + if (!req || req->msg.opcode != CACHEFILES_OP_OPEN || + !req->object->ondemand->ondemand_id) { + xa_unlock(&cache->reqs); return -EINVAL; + } + xas_store(&xas, NULL); + xa_unlock(&cache->reqs); /* fail OPEN request if copen format is invalid */ ret = kstrtol(psize, 0, &size); |