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Subject[PATCH 3/4] fuse: skip blocking on allocations of synchronous requests
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Date
Miklos wrote:

> A task may have at most one synchronous request allocated. So these
> requests need not be otherwise limited.

The patch re-works fuse_get_req() to follow this idea.

Signed-off-by: Maxim Patlasov <mpatlasov@parallels.com>
---
fs/fuse/dev.c | 26 ++++++++++++++++++--------
1 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 6137650..1f7ce89 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -137,17 +137,27 @@ struct fuse_req *fuse_get_req_internal(struct fuse_conn *fc, unsigned npages,
bool for_background)
{
struct fuse_req *req;
- sigset_t oldset;
- int intr;
int err;
+ int *flag_p = NULL;

atomic_inc(&fc->num_waiting);
- block_sigs(&oldset);
- intr = wait_event_interruptible(fc->blocked_waitq, !fc->blocked);
- restore_sigs(&oldset);
- err = -EINTR;
- if (intr)
- goto out;
+
+ if (for_background)
+ flag_p = &fc->blocked;
+ else if (fc->uninitialized)
+ flag_p = &fc->uninitialized;
+
+ if (flag_p) {
+ sigset_t oldset;
+ int intr;
+
+ block_sigs(&oldset);
+ intr = wait_event_interruptible(fc->blocked_waitq, !*flag_p);
+ restore_sigs(&oldset);
+ err = -EINTR;
+ if (intr)
+ goto out;
+ }

err = -ENOTCONN;
if (!fc->connected)


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