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GET /api/patches/816565/?format=api
{ "id": 816565, "url": "http://patchwork.ozlabs.org/api/patches/816565/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20170920224605.22030-10-ebiggers3@gmail.com/", "project": { "id": 8, "url": "http://patchwork.ozlabs.org/api/projects/8/?format=api", "name": "Linux ext4 filesystem development", "link_name": "linux-ext4", "list_id": "linux-ext4.vger.kernel.org", "list_email": "linux-ext4@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170920224605.22030-10-ebiggers3@gmail.com>", "list_archive_url": null, "date": "2017-09-20T22:45:49", "name": "[09/25] fscrypt: new helper function - fscrypt_prepare_lookup()", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": true, "hash": "1d7f4b7a0b381c02271d03f209e42925a3966eb0", "submitter": { "id": 65202, "url": "http://patchwork.ozlabs.org/api/people/65202/?format=api", "name": "Eric Biggers", "email": "ebiggers3@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-ext4/patch/20170920224605.22030-10-ebiggers3@gmail.com/mbox/", "series": [ { "id": 4249, "url": "http://patchwork.ozlabs.org/api/series/4249/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-ext4/list/?series=4249", "date": "2017-09-20T22:45:40", "name": "fscrypt: add some higher-level helper functions", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/4249/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/816565/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/816565/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linux-ext4-owner@vger.kernel.org>", "X-Original-To": "patchwork-incoming@ozlabs.org", "Delivered-To": "patchwork-incoming@ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=linux-ext4-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)", "ozlabs.org; dkim=pass (2048-bit key;\n\tunprotected) header.d=gmail.com header.i=@gmail.com\n\theader.b=\"faGvskiN\"; dkim-atps=neutral" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xyFL43STwz9sNr\n\tfor <patchwork-incoming@ozlabs.org>;\n\tThu, 21 Sep 2017 08:49:32 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1752235AbdITWt1 (ORCPT <rfc822;patchwork-incoming@ozlabs.org>);\n\tWed, 20 Sep 2017 18:49:27 -0400", "from mail-pg0-f66.google.com ([74.125.83.66]:33728 \"EHLO\n\tmail-pg0-f66.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1751930AbdITWrC (ORCPT\n\t<rfc822; linux-ext4@vger.kernel.org>); Wed, 20 Sep 2017 18:47:02 -0400", "by mail-pg0-f66.google.com with SMTP id i130so2381394pgc.0;\n\tWed, 20 Sep 2017 15:47:01 -0700 (PDT)", "from ebiggers-linuxstation.kir.corp.google.com ([100.66.174.81])\n\tby smtp.gmail.com with ESMTPSA id j2sm6249pgn.26.2017.09.20.15.47.00\n\t(version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128);\n\tWed, 20 Sep 2017 15:47:00 -0700 (PDT)" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=gmail.com; s=20161025;\n\th=from:to:cc:subject:date:message-id:in-reply-to:references;\n\tbh=5C3TQyQ+3QBQNEZR0/tVKjPvU5CaNMNmDDtFsBid8wA=;\n\tb=faGvskiNBidGagoduCB1+QEWOKuGXaQ9OPBYeBmc/8YGmpX+bG16k9E6QN619pZ07l\n\t16iSe0bRWgrfONCrGIfXJvaK+LfC4lZzzbdgNH2lctat3ZnwXf92A3THZ5vVpc057Ozh\n\txkqMdQm9v05eOwoRtO7PZREG1tbH3Nw3tYfEfCIblcSVo6Jjco1ktJYVR5mtQ6HGsKaz\n\tYXDE6DIAgKa9KM0uHiw6F8OII/tKYhCPu4ra16EodwpH7HbdbpIL8EAf9xTc9IIrdWUb\n\t3eubRS5uDYIxrT0Y367+jX7/XyimGJilYNkgs97VYejT9kHkV1XSkvWeDpM3LgA4U1UD\n\tjr/Q==", "X-Google-DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=1e100.net; s=20161025;\n\th=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to\n\t:references;\n\tbh=5C3TQyQ+3QBQNEZR0/tVKjPvU5CaNMNmDDtFsBid8wA=;\n\tb=IdaLpkoObLA15ykDVMW/DKuW1clftyDz75IUDvKB3ruEJOxqlLq6FTRK46rSIctw3q\n\tQz12nTm6lKbzE5o8vbnCiWh+OkZK+xbqPepp0YrSq4hHBe694GZeQbcG2rvZVdcne3V6\n\tn5z3ALxhkS2w6bgcbODwk9PZ05tWSXdjwCb/w7am4mb0bIEaB9bUluZp4Whym51htphZ\n\trhGKQE97wV7SoaTlkhs8hz4vL/eiAVn3kDIkwmuRfedZPyrTUi8rr8gJW/QzYtmMjF97\n\tidm7bBji6sRklYYukj74p5XPQ8nM/IkWUz2MxahGINMCPvtf0tHh7effKEhSf5vq8n30\n\tagcg==", "X-Gm-Message-State": "AHPjjUgOO3xhTID2R/SvPTS6lnTeK2rC0d9aTunGGP1qY3beYgWmlmt4\n\tQTMDFHVkYBCJnlDR1diKcnwaQlrGeTk=", "X-Google-Smtp-Source": "AOwi7QDHsUQw62RhFIHlUuu9xsYjJMkap/OruMuQMOSA65UmJjeiQ3SPam+ez8Ci+uKnCc5mfLrDOA==", "X-Received": "by 10.159.246.2 with SMTP id b2mr3523853pls.85.1505947621357;\n\tWed, 20 Sep 2017 15:47:01 -0700 (PDT)", "From": "Eric Biggers <ebiggers3@gmail.com>", "To": "linux-fscrypt@vger.kernel.org", "Cc": "linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org,\n\tlinux-f2fs-devel@lists.sourceforge.net,\n\tlinux-mtd@lists.infradead.org, \"Theodore Y . Ts'o\" <tytso@mit.edu>,\n\tJaegeuk Kim <jaegeuk@kernel.org>, Michael Halcrow <mhalcrow@google.com>,\n\tEric Biggers <ebiggers@google.com>", "Subject": "[PATCH 09/25] fscrypt: new helper function -\n\tfscrypt_prepare_lookup()", "Date": "Wed, 20 Sep 2017 15:45:49 -0700", "Message-Id": "<20170920224605.22030-10-ebiggers3@gmail.com>", "X-Mailer": "git-send-email 2.14.1.821.g8fa685d3b7-goog", "In-Reply-To": "<20170920224605.22030-1-ebiggers3@gmail.com>", "References": "<20170920224605.22030-1-ebiggers3@gmail.com>", "Sender": "linux-ext4-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<linux-ext4.vger.kernel.org>", "X-Mailing-List": "linux-ext4@vger.kernel.org" }, "content": "From: Eric Biggers <ebiggers@google.com>\n\nIntroduce a helper function which prepares to look up the given dentry\nin the given directory. If the directory is encrypted, it handles\nloading the directory's encryption key, setting the dentry's ->d_op to\nfscrypt_d_ops, and setting DCACHE_ENCRYPTED_WITH_KEY if the directory's\nencryption key is available.\n\nNote: once all filesystems switch over to this, we'll be able to move\nfscrypt_d_ops and fscrypt_set_encrypted_dentry() to fscrypt_private.h.\n\nSigned-off-by: Eric Biggers <ebiggers@google.com>\n---\n fs/crypto/hooks.c | 18 ++++++++++++++++++\n include/linux/fscrypt_notsupp.h | 9 +++++++++\n include/linux/fscrypt_supp.h | 30 ++++++++++++++++++++++++++++++\n 3 files changed, 57 insertions(+)", "diff": "diff --git a/fs/crypto/hooks.c b/fs/crypto/hooks.c\nindex 822cb78f9b45..9f5fb2eb9cf7 100644\n--- a/fs/crypto/hooks.c\n+++ b/fs/crypto/hooks.c\n@@ -92,3 +92,21 @@ int __fscrypt_prepare_rename(struct inode *old_dir, struct dentry *old_dentry,\n \treturn 0;\n }\n EXPORT_SYMBOL_GPL(__fscrypt_prepare_rename);\n+\n+int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry)\n+{\n+\tint err = fscrypt_get_encryption_info(dir);\n+\n+\tif (err)\n+\t\treturn err;\n+\n+\tif (fscrypt_has_encryption_key(dir)) {\n+\t\tspin_lock(&dentry->d_lock);\n+\t\tdentry->d_flags |= DCACHE_ENCRYPTED_WITH_KEY;\n+\t\tspin_unlock(&dentry->d_lock);\n+\t}\n+\n+\td_set_d_op(dentry, &fscrypt_d_ops);\n+\treturn 0;\n+}\n+EXPORT_SYMBOL_GPL(__fscrypt_prepare_lookup);\ndiff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h\nindex a88a2959cd8c..e9b437605f9c 100644\n--- a/include/linux/fscrypt_notsupp.h\n+++ b/include/linux/fscrypt_notsupp.h\n@@ -209,4 +209,13 @@ static inline int fscrypt_prepare_rename(struct inode *old_dir,\n \treturn 0;\n }\n \n+static inline int fscrypt_prepare_lookup(struct inode *dir,\n+\t\t\t\t\t struct dentry *dentry,\n+\t\t\t\t\t unsigned int flags)\n+{\n+\tif (IS_ENCRYPTED(dir))\n+\t\treturn -EOPNOTSUPP;\n+\treturn 0;\n+}\n+\n #endif\t/* _LINUX_FSCRYPT_NOTSUPP_H */\ndiff --git a/include/linux/fscrypt_supp.h b/include/linux/fscrypt_supp.h\nindex fa062d41b39a..2b99bc01c59b 100644\n--- a/include/linux/fscrypt_supp.h\n+++ b/include/linux/fscrypt_supp.h\n@@ -240,4 +240,34 @@ static inline int fscrypt_prepare_rename(struct inode *old_dir,\n \treturn 0;\n }\n \n+extern int __fscrypt_prepare_lookup(struct inode *dir, struct dentry *dentry);\n+\n+/**\n+ * fscrypt_prepare_lookup - prepare to lookup a name in a possibly-encrypted directory\n+ * @dir: directory being searched\n+ * @dentry: filename being looked up\n+ * @flags: lookup flags\n+ *\n+ * Prepare for ->lookup() in a directory which may be encrypted. Lookups can be\n+ * done with or without the directory's encryption key; without the key,\n+ * filenames are presented in encrypted form. Therefore, we'll try to set up\n+ * the directory's encryption key, but even without it the lookup can continue.\n+ *\n+ * To allow invalidating stale dentries if the directory's encryption key is\n+ * added later, we also install a custom ->d_revalidate() method and use the\n+ * DCACHE_ENCRYPTED_WITH_KEY flag to indicate whether a given dentry is a\n+ * plaintext name (flag set) or a ciphertext name (flag cleared).\n+ *\n+ * Return: 0 on success, -errno if a problem occurred while setting up the\n+ * encryption key\n+ */\n+static inline int fscrypt_prepare_lookup(struct inode *dir,\n+\t\t\t\t\t struct dentry *dentry,\n+\t\t\t\t\t unsigned int flags)\n+{\n+\tif (IS_ENCRYPTED(dir))\n+\t\treturn __fscrypt_prepare_lookup(dir, dentry);\n+\treturn 0;\n+}\n+\n #endif\t/* _LINUX_FSCRYPT_SUPP_H */\n", "prefixes": [ "09/25" ] }