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authorMaxim Patlasov <mpatlasov@parallels.com>2013-03-21 18:02:28 +0400
committerMiklos Szeredi <mszeredi@suse.cz>2013-04-17 12:31:45 +0200
commit0aada88476a33690c9569b094191ce92a38e6541 (patch)
tree4aef3365654d4751154dc825731af721661fcef2
parent796523fb24028639c007f71e02ca21730f7c0af6 (diff)
downloadop-kernel-dev-0aada88476a33690c9569b094191ce92a38e6541.zip
op-kernel-dev-0aada88476a33690c9569b094191ce92a38e6541.tar.gz
fuse: skip blocking on allocations of synchronous requests
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> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
-rw-r--r--fs/fuse/cuse.c1
-rw-r--r--fs/fuse/dev.c30
-rw-r--r--fs/fuse/inode.c3
3 files changed, 21 insertions, 13 deletions
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index f563e78..c59c097 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -504,7 +504,6 @@ 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) {
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 39c2fe3..d692b85 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -130,21 +130,30 @@ static void fuse_req_init_context(struct fuse_req *req)
req->in.h.pid = current->pid;
}
+static bool fuse_block_alloc(struct fuse_conn *fc, bool for_background)
+{
+ return !fc->initialized || (for_background && fc->blocked);
+}
+
static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages,
bool for_background)
{
struct fuse_req *req;
- sigset_t oldset;
- int intr;
int err;
-
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 (fuse_block_alloc(fc, for_background)) {
+ sigset_t oldset;
+ int intr;
+
+ block_sigs(&oldset);
+ intr = wait_event_interruptible(fc->blocked_waitq,
+ !fuse_block_alloc(fc, for_background));
+ restore_sigs(&oldset);
+ err = -EINTR;
+ if (intr)
+ goto out;
+ }
err = -ENOTCONN;
if (!fc->connected)
@@ -239,7 +248,7 @@ struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
struct fuse_req *req;
atomic_inc(&fc->num_waiting);
- wait_event(fc->blocked_waitq, !fc->blocked);
+ wait_event(fc->blocked_waitq, fc->initialized);
req = fuse_request_alloc(0);
if (!req)
req = get_reserved_req(fc, file);
@@ -2106,6 +2115,7 @@ int fuse_dev_release(struct inode *inode, struct file *file)
spin_lock(&fc->lock);
fc->connected = 0;
fc->blocked = 0;
+ fc->initialized = 1;
end_queued_requests(fc);
end_polls(fc);
wake_up_all(&fc->blocked_waitq);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 4958f80..17ec1f7 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -583,7 +583,7 @@ void fuse_conn_init(struct fuse_conn *fc)
fc->khctr = 0;
fc->polled_files = RB_ROOT;
fc->reqctr = 0;
- fc->blocked = 1;
+ fc->blocked = 0;
fc->initialized = 0;
fc->attr_version = 1;
get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
@@ -883,7 +883,6 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
fc->max_write = max_t(unsigned, 4096, fc->max_write);
fc->conn_init = 1;
}
- fc->blocked = 0;
fc->initialized = 1;
wake_up_all(&fc->blocked_waitq);
}
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