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Tue, 30 Jun 2020 13:43:49 -0700 (PDT) Date: Tue, 30 Jun 2020 13:43:48 -0700 From: Nathan Chancellor To: Jaegeuk Kim Message-ID: <20200630204348.GA2504307@ubuntu-s3-xlarge-x86> References: <20200624012148.180050-1-jaegeuk@kernel.org> <20200629150323.GA3293033@google.com> <20200629202720.GA230664@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200629202720.GA230664@google.com> X-Headers-End: 1jqN6h-003U50-Tt Subject: Re: [f2fs-dev] [PATCH v3] f2fs: avoid readahead race condition X-BeenThere: linux-f2fs-devel@lists.sourceforge.net X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: linux-f2fs-devel-bounces@lists.sourceforge.net T24gTW9uLCBKdW4gMjksIDIwMjAgYXQgMDE6Mjc6MjBQTSAtMDcwMCwgSmFlZ2V1ayBLaW0gd3Jv dGU6Cj4gSWYgdHdvIHJlYWRhaGVhZCB0aHJlYWRzIGhhdmluZyBzYW1lIG9mZnNldCBlbnRlciBp biByZWFkcGFnZXMsIGV2ZXJ5IHJlYWQKPiBJT3MgYXJlIHNwbGl0IGFuZCBpc3N1ZWQgdG8gdGhl IGRpc2sgd2hpY2ggZ2l2aW5nIGxvd2VyIGJhbmR3aWR0aC4KPiAKPiBUaGlzIHBhdGNoIHRyaWVz IHRvIGF2b2lkIHJlZHVuZGFudCByZWFkYWhlYWQgY2FsbHMuCj4gCj4gU2lnbmVkLW9mZi1ieTog SmFlZ2V1ayBLaW0gPGphZWdldWtAa2VybmVsLm9yZz4KPiAtLS0KPiB2MzoKPiAgLSB1c2UgUkVB RHxXUklURV9PTkNFCj4gdjI6Cj4gICAtIGFkZCBtaXNzaW5nIGNvZGUgdG8gYnlwYXNzIHJlYWQK PiAgCj4gIGZzL2YyZnMvZGF0YS5jICB8IDE4ICsrKysrKysrKysrKysrKysrKwo+ICBmcy9mMmZz L2YyZnMuaCAgfCAgMSArCj4gIGZzL2YyZnMvc3VwZXIuYyB8ICAyICsrCj4gIDMgZmlsZXMgY2hh bmdlZCwgMjEgaW5zZXJ0aW9ucygrKQo+IAo+IGRpZmYgLS1naXQgYS9mcy9mMmZzL2RhdGEuYyBi L2ZzL2YyZnMvZGF0YS5jCj4gaW5kZXggOTk1Y2Y3OGIyM2M1ZS4uMzYwYjRjOTA4MGQ5NyAxMDA2 NDQKPiAtLS0gYS9mcy9mMmZzL2RhdGEuYwo+ICsrKyBiL2ZzL2YyZnMvZGF0YS5jCj4gQEAgLTIy OTYsNiArMjI5Niw3IEBAIHN0YXRpYyBpbnQgZjJmc19tcGFnZV9yZWFkcGFnZXMoc3RydWN0IGlu b2RlICppbm9kZSwKPiAgCXVuc2lnbmVkIG5yX3BhZ2VzID0gcmFjID8gcmVhZGFoZWFkX2NvdW50 KHJhYykgOiAxOwo+ICAJdW5zaWduZWQgbWF4X25yX3BhZ2VzID0gbnJfcGFnZXM7Cj4gIAlpbnQg cmV0ID0gMDsKPiArCWJvb2wgZHJvcF9yYSA9IGZhbHNlOwo+ICAKPiAgCW1hcC5tX3BibGsgPSAw Owo+ICAJbWFwLm1fbGJsayA9IDA7Cj4gQEAgLTIzMDYsMTAgKzIzMDcsMjQgQEAgc3RhdGljIGlu dCBmMmZzX21wYWdlX3JlYWRwYWdlcyhzdHJ1Y3QgaW5vZGUgKmlub2RlLAo+ICAJbWFwLm1fc2Vn X3R5cGUgPSBOT19DSEVDS19UWVBFOwo+ICAJbWFwLm1fbWF5X2NyZWF0ZSA9IGZhbHNlOwo+ICAK PiArCS8qCj4gKwkgKiBUd28gcmVhZGFoZWFkIHRocmVhZHMgZm9yIHNhbWUgYWRkcmVzcyByYW5n ZSBjYW4gY2F1c2UgcmFjZSBjb25kaXRpb24KPiArCSAqIHdoaWNoIGZyYWdtZW50cyBzZXF1ZW50 aWFsIHJlYWQgSU9zLiBTbyBsZXQncyBhdm9pZCBlYWNoIG90aGVyLgo+ICsJICovCj4gKwlpZiAo cmFjICYmIHJlYWRhaGVhZF9jb3VudChyYWMpKSB7Cj4gKwkJaWYgKFJFQURfT05DRShGMkZTX0ko aW5vZGUpLT5yYV9vZmZzZXQpID09IHJlYWRhaGVhZF9pbmRleChyYWMpKQo+ICsJCQlkcm9wX3Jh ID0gdHJ1ZTsKPiArCQllbHNlCj4gKwkJCVdSSVRFX09OQ0UoRjJGU19JKGlub2RlKS0+cmFfb2Zm c2V0LAo+ICsJCQkJCQlyZWFkYWhlYWRfaW5kZXgocmFjKSk7Cj4gKwl9Cj4gKwo+ICAJZm9yICg7 IG5yX3BhZ2VzOyBucl9wYWdlcy0tKSB7Cj4gIAkJaWYgKHJhYykgewo+ICAJCQlwYWdlID0gcmVh ZGFoZWFkX3BhZ2UocmFjKTsKPiAgCQkJcHJlZmV0Y2h3KCZwYWdlLT5mbGFncyk7Cj4gKwkJCWlm IChkcm9wX3JhKQo+ICsJCQkJZ290byBuZXh0X3BhZ2U7CgpXaGVuIENPTkZJR19GMkZTX0ZTX0NP TVBSRVNTSU9OIGlzIG5vdCBzZXQgKGkuZS4geDg2XzY0IGRlZmNvbmZpZyArCkNPTkZJR19GMkZT X0ZTPXkpOgoKJCBtYWtlIC1za2oiJChucHJvYykiIE89b3V0IGRpc3RjbGVhbiBkZWZjb25maWcg ZnMvZjJmcy9kYXRhLm8KLi4vZnMvZjJmcy9kYXRhLmM6IEluIGZ1bmN0aW9uIOKAmGYyZnNfbXBh Z2VfcmVhZHBhZ2Vz4oCZOgouLi9mcy9mMmZzL2RhdGEuYzoyMzI3OjU6IGVycm9yOiBsYWJlbCDi gJhuZXh0X3BhZ2XigJkgdXNlZCBidXQgbm90IGRlZmluZWQKIDIzMjcgfCAgICAgZ290byBuZXh0 X3BhZ2U7CiAgICAgIHwgICAgIF5+fn4KLi4uCgpDaGVlcnMsCk5hdGhhbgoKCl9fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCkxpbnV4LWYyZnMtZGV2ZWwgbWFp bGluZyBsaXN0CkxpbnV4LWYyZnMtZGV2ZWxAbGlzdHMuc291cmNlZm9yZ2UubmV0Cmh0dHBzOi8v bGlzdHMuc291cmNlZm9yZ2UubmV0L2xpc3RzL2xpc3RpbmZvL2xpbnV4LWYyZnMtZGV2ZWwK