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authorMiklos Szeredi <mszeredi@suse.cz>2008-02-06 01:38:39 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-06 10:41:13 -0800
commitd12def1bcb809b6172ee207a24e00a0a4398df1d (patch)
tree96e151de1e80cacd9202a00b77654533a9754207 /fs/fuse/fuse_i.h
parentb57d426445c98789265de6a9338cdb06462d15fb (diff)
downloadop-kernel-dev-d12def1bcb809b6172ee207a24e00a0a4398df1d.zip
op-kernel-dev-d12def1bcb809b6172ee207a24e00a0a4398df1d.tar.gz
fuse: limit queued background requests
Libfuse basically creates a new thread for each new request. This is fine for synchronous requests, which are naturally limited. However background requests (especially writepage) can cause a thread creation storm. To avoid this, limit the number of background requests available to userspace. This is done by introducing another queue for background requests, and a counter for the number of "active" requests, which are currently available for userspace. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/fuse/fuse_i.h')
-rw-r--r--fs/fuse/fuse_i.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index c5c1ebf..67aaf6e 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -296,6 +296,12 @@ struct fuse_conn {
/** Number of requests currently in the background */
unsigned num_background;
+ /** Number of background requests currently queued for userspace */
+ unsigned active_background;
+
+ /** The list of background requests set aside for later queuing */
+ struct list_head bg_queue;
+
/** Pending interrupts */
struct list_head interrupts;
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