diff options
| author | Maxim Patlasov <mpatlasov@parallels.com> | 2013-03-21 18:02:28 +0400 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@suse.cz> | 2013-04-17 12:31:45 +0200 |
| commit | 0aada88476a33690c9569b094191ce92a38e6541 (patch) | |
| tree | 4aef3365654d4751154dc825731af721661fcef2 | |
| parent | 796523fb24028639c007f71e02ca21730f7c0af6 (diff) | |
| download | renesas_kernel-0aada88476a33690c9569b094191ce92a38e6541.tar.gz renesas_kernel-0aada88476a33690c9569b094191ce92a38e6541.tar.bz2 renesas_kernel-0aada88476a33690c9569b094191ce92a38e6541.zip | |
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.c | 1 | ||||
| -rw-r--r-- | fs/fuse/dev.c | 30 | ||||
| -rw-r--r-- | fs/fuse/inode.c | 3 |
3 files changed, 21 insertions, 13 deletions
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c index f563e78852b..c59c097eb2e 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 39c2fe3ba93..d692b85115b 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 4958f8099f1..17ec1f70524 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); } |