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authorMiklos Szeredi <mszeredi@suse.cz>2010-12-07 20:16:56 +0100
committerMiklos Szeredi <mszeredi@suse.cz>2010-12-07 20:16:56 +0100
commit02c048b919455aaa38628563cdcc2e691c8a9f53 (patch)
tree1f98cd9fab564b6df8869a60f36e82d5d20f14f3 /include/linux/fuse.h
parent07e77dca8a1f17a724a9b7449f0ca02e70e9d057 (diff)
downloadop-kernel-dev-02c048b919455aaa38628563cdcc2e691c8a9f53.zip
op-kernel-dev-02c048b919455aaa38628563cdcc2e691c8a9f53.tar.gz
fuse: allow batching of FORGET requests
Terje Malmedal reports that a fuse filesystem with 32 million inodes on a machine with lots of memory can take up to 30 minutes to process FORGET requests when all those inodes are evicted from the icache. To solve this, create a BATCH_FORGET request that allows up to about 8000 FORGET requests to be sent in a single message. This request is only sent if userspace supports interface version 7.16 or later, otherwise fall back to sending individual FORGET messages. Reported-by: Terje Malmedal <terje.malmedal@usit.uio.no> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Diffstat (limited to 'include/linux/fuse.h')
-rw-r--r--include/linux/fuse.h16
1 files changed, 15 insertions, 1 deletions
diff --git a/include/linux/fuse.h b/include/linux/fuse.h
index c3c578e..cf11881 100644
--- a/include/linux/fuse.h
+++ b/include/linux/fuse.h
@@ -41,6 +41,9 @@
* 7.15
* - add store notify
* - add retrieve notify
+ *
+ * 7.16
+ * - add BATCH_FORGET request
*/
#ifndef _LINUX_FUSE_H
@@ -72,7 +75,7 @@
#define FUSE_KERNEL_VERSION 7
/** Minor version number of this interface */
-#define FUSE_KERNEL_MINOR_VERSION 15
+#define FUSE_KERNEL_MINOR_VERSION 16
/** The node ID of the root inode */
#define FUSE_ROOT_ID 1
@@ -256,6 +259,7 @@ enum fuse_opcode {
FUSE_IOCTL = 39,
FUSE_POLL = 40,
FUSE_NOTIFY_REPLY = 41,
+ FUSE_BATCH_FORGET = 42,
/* CUSE specific operations */
CUSE_INIT = 4096,
@@ -290,6 +294,16 @@ struct fuse_forget_in {
__u64 nlookup;
};
+struct fuse_forget_one {
+ __u64 nodeid;
+ __u64 nlookup;
+};
+
+struct fuse_batch_forget_in {
+ __u32 count;
+ __u32 dummy;
+};
+
struct fuse_getattr_in {
__u32 getattr_flags;
__u32 dummy;
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