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Ask for large writes from the kernel. 

For googlecloudplatform/gcsfuse#27.
geesefs-0-30-9
Aaron Jacobs 2015-03-26 16:10:07 +11:00
parent 0e7e9c3f78
commit 5dbc3bcd61
1 changed files with 20 additions and 0 deletions
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20
fuseops/ops.go
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@ -58,6 +58,26 @@ func (o *InitOp) Respond(err error) {
resp := &bazilfuse.InitResponse{}
// Unconditionally enable large WriteFile ops from the kernel on Linux.
//
// As of 2015-03-26, the behavior in the kernel is:
//
// * (http://goo.gl/jMKHMZ, http://goo.gl/XTF4ZH) Cap the max write size at
// the maximum of 4096 and init_response->max_write.
//
// * (http://goo.gl/gEIvHZ) If FUSE_BIG_WRITES isn't set, don't return more
// than one page.
//
// * (http://goo.gl/4RLhxZ, http://goo.gl/hi0Cm2) Never write more than
// FUSE_MAX_PAGES_PER_REQ pages (128 KiB on x86).
//
// 4 KiB is crazy small. Ask for significantly more, and take what the kernel
// will give us.
const maxWrite = 1 << 21
resp.Flags |= bazilfuse.InitBigWrites
resp.MaxWrite = maxWrite
// Respond.
o.commonOp.logger.Printf("Responding: %v", &resp)
o.r.(*bazilfuse.InitRequest).Respond(resp)
}