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Fri, 30 May 2025 14:12:27 +0800 (CST) Date: Fri, 30 May 2025 14:12:27 +0800 (CST) From: "David Wang" <00107082@163.com> To: "Theodore Ts'o" Cc: adilger.kernel@dilger.ca, linux-ext4@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [RFC] ext4: use kmem_cache for short fname allocation in readdir X-Priority: 3 X-Mailer: Coremail Webmail Server Version XT5.0.14 build 20240801(9da12a7b) Copyright (c) 2002-2025 www.mailtech.cn 163com In-Reply-To: <20250530043516.GD332467@mit.edu> References: <20250529144256.4517-1-00107082@163.com> <20250530043516.GD332467@mit.edu> X-NTES-SC: AL_Qu2fCvmTuk0v4SifbOkZnEYQheY4XMKyuPkg1YJXOp80iiXw+TwleXBdJFzfwcOmET6tvxevTR985dV8TbNWXZyga29wKsrxG5jtNZnpVpby Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK Precedence: bulk X-Mailing-List: linux-ext4@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <2579f239.5415.1971fd2086a.Coremail.00107082@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID:iSgvCgD3X_VMTDlom+0QAA--.9225W X-CM-SenderInfo: qqqrilqqysqiywtou0bp/1tbiqBJdqmg5RdBhNwADsc X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== CkF0IDIwMjUtMDUtMzAgMTI6MzU6MTYsICJUaGVvZG9yZSBUcydvIiA8dHl0c29AbWl0LmVkdT4g d3JvdGU6Cj5PbiBUaHUsIE1heSAyOSwgMjAyNSBhdCAxMDo0Mjo1NlBNICswODAwLCBEYXZpZCBX YW5nIHdyb3RlOgo+PiBXaGVuIHNlYXJjaGluZyBmaWxlcywgZXh0NF9yZWFkZGlyIHdvdWxkIGt6 YWxsb2MoKSBhIGZuYW1lCj4+IG9iamVjdCBmb3IgZWFjaCBlbnRyeS4gSXQgd291bGQgYmUgZmFz dGVyIGlmIGEgZGVkaWNhdGVkCj4+IGttZW1fY2FjaGUgaXMgdXNlZCBmb3IgZm5hbWUuCj4+IAo+ PiBCdXQgZm5hbWVzIGFyZSBvZiB2YXJpYWJsZSBsZW5ndGguCj4+IAo+PiBUaGlzIHBhdGNoIHN1 Z2dlc3RzIHVzaW5nIGttZW1fY2FjaGUgZm9yIGZuYW1lIHdpdGggc2hvcnQKPj4gbGVuZ3RoLCBh bmQgcmVzb3J0aW5nIHRvIGt6YWxsb2Mgd2hlbiBmbmFtZSBuZWVkcyBsYXJnZXIgYnVmZmVyLgo+ PiBBc3N1bWluZyBsb25nIGZpbGUgbmFtZXMgYXJlIG5vdCB2ZXJ5IGNvbW1vbi4KPj4gCj4+IFBy b2ZpbGluZyB3aGVuIHNlYXJjaGluZyBmaWxlcyBpbiBrZXJuZWwgY29kZSBiYXNlLCB3aXRoIGZv bGxvd2luZwo+PiBjb21tYW5kOgo+PiAJIyBwZXJmIHJlY29yZCAtZyAtZSBjcHUtY2xvY2sgLS1m cmVxPW1heCBiYXNoIC1jIFwKPj4gCSJmb3IgaSBpbiB7MS4uMTAwfTsgZG8gZmluZCAuL2xpbnV4 IC1uYW1lIG5vdGZvdW5kYXRhbGwgPiAvZGV2L251bGw7IGRvbmUiCj4+IEFuZCB1c2luZyBzYW1w bGUgY291bnRzIGFzIGluZGljYXRvciBvZiBwZXJmb3JtYW5jZSBpbXByb3ZlbWVudC4KPgo+SSB3 b3VsZCB0aGluayBhIGJldHRlciBpbmRpY2F0b3Igb2YgcGVyZm9ybWFuY2UgaW1wcm92ZW1lbnQg d291bGQgYmUKPnRvIG1lYXN1cmUgdGhlIHN5c3RlbSB0aW1lIHdoZW4gcnVubmluZyB0aGUgZmlu ZCBjb21tYW5kcy4gIChpLmUuLAo+ZWl0aGVyIHVzaW5nIGdldHJ1c2FuZ2Ugd2l0aCBSVVNBR0Vf Q0hJTERSRU4gb3Igd2FpdDMgb3Igd2FpdDQpLgoKSSBkaWQgdXNlIGB0aW1lYCB0byBjb21wYXJl IHN5c3RlbSB0aW1lIHdoZW4gc2VhcmNoIGZpbGVzIHdpdGggZmluZCwKYW5kIEkgZGlkIHNlZSBz bGlnaHQgaW1wcm92ZW1lbnQuICAKVGhlIHN0ZCBkZXZpYXRpb24gaXMgcXVpdGUgaGlnaCBmb3Ig dGhlIHdob2xlIGBmaW5kYCBwcm9jZXNzIHRob3VnaC4KCj4KPldlJ3JlIHRyYWRpbmcgb2ZmIHNv bWUgZXh0cmEgbWVtb3J5IHVzYWdlIGFuZCBjb2RlIGNvbXBsZXhpdHkgd2l0aAo+bGVzcyBDUFUg dGltZSBiZWNhdXNlIGVudHJpZXMgaW4gdGhlIGttZW1fY2FjaGUgbWlnaHQgYmUgbW9yZSBUTEIK PmZyaWVuZGx5LiAgQnV0IHRoaXMgaXMgb25seSByZWFsbHkgZ29pbmcgdG8gYmUgYXBwbGljYWJs ZSBpZiB0aGUKPmRpcmVjdG9yeSBpcyBsYXJnZSBlbm91Z2ggc3VjaCB0aGF0IHRoZSBjeWNsZXMg c3BlbnQgaW4gcmVhZGRpciBpcwo+c2lnbmlmaWNhbnQgY29tcGFyZWQgdG8gdGhlIHJlc3Qgb2Yg dGhlIHVzZXJzcGFjZSBwcm9ncmFtLCAqYW5kKiB5b3UKPmFyZSByZWFkaW5nIHRoZSBkaXJlY3Rv cnkgbXVsdGlwbGUgdGltZXMgKGUuZy4sIGNhbGxpbmcgZmluZCBvbiBhCj5kaXJlY3RvcnkgaGll cmFyY2h5IG1hbnksIG1hbnkgdGltZXMpIHN1Y2ggdGhhdCB0aGUgZGlzayBibG9ja3MgYXJlCj5j YWhlZCBhbmQgeW91IGRvbid0IG5lZWQgdG8gcmVhZCB0aGVtIGZyb20gdGhlIHN0b3JhZ2UgZGV2 aWNlLgo+T3RoZXJ3aXNlIHRoZSBJL08gY29zdHMgd2lsbCBjb21wbGV0ZWx5IGRvbWluYXRlIGFu ZCBzd2FtcCB0aGUKPm1hcmdpbmFsIFRMQiBjYWNoZSBzYXZpbmdzLgoKWWVzLCB0aGUgdGVzdCB3 YXMgcnVuIHdpdGggY2FjaGUtaG90LiAKQnV0IHJlcGVhdGluZyBzZWFyY2ggZmlsZXMgaXMgbm90 ICB1bmNvbW1vbiBwcmFjdGljZSwgIGBmaW5kYCB3b3VsZCBydW4gd2l0aCBjYWNoZS1ob3QKZXhj ZXB0IHRoZSBmaXJzdCByb3VuZC4KIAo+Cj5HaXZlbiB0aGF0IGl0J3MgcmVhbGx5IHJhcmUgZm9y IHJlYWRkaXIoKSB0byBiZSB0aGUgYm90dGxlbmVjayBvZiBtYW55Cj53b3JrbG9hZHMsIHRoZSBx dWVzdGlvbiBpcywgaXMgaXQgd29ydGggaXQ/CgpUaGF0J3MgdGhlIHF1ZXN0aW9uIEkgaGF2ZSBi ZWVuIHRoaW5raW5nIGFib3V0LgpCZXNpZGUgbWFyZ2luYWwgaW1wcm92ZW1lbnQgZm9yIHJlYWRk aXIoKSwgSSB3b3VsZCBhcmd1ZSB3aXRoIHRoZSBpbXBhY3Qgb24gb3RoZXIgcGFydHMgaW4gc3lz dGVtCndoZW4gc2VhcmNoaW5nIGZpbGVzLiBFdmVuIHdpdGggY2FjaGUtY29kZSwgc2VhcmNoaW5n IGxhcmdlIGRpciB3b3VsZCBpbnZvbHZpbmcgaGlnaCBmcmVxdWVudCBvZgptYWxsb2MoKSBmb3Ig YSBzaG9ydCBpbnRlcnZhbCwgIFRoaXMgbWlnaHQgaGF2ZSB0cmFuc2llbnQgbmVnYXRpdmUgaW1w YWN0ICBvbiBvdGhlcnMgd2hpY2ggYWxzbyByZXF1ZXN0IG1hbGxvYygpLCBidXQgd2l0aApsb3cg ZnJlcXVlbmN5LiAgQnV0IEkgZG9uJ3QgaGF2ZSBhIGNvbnZpbmNpbmcgZXhhbXBsZXMgZm9yIHRo aXMsIGl0J3MgYWxsIHRoZW9yZXRpY2FsIC4KCgpUaGFua3MKRGF2aWQKCj4KPgkJCQkJCS0gVGVk Cg==