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GET /api/patches/816557/?format=api
{ "id": 816557, "url": "http://patchwork.ozlabs.org/api/patches/816557/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-mtd/patch/20170920224605.22030-6-ebiggers3@gmail.com/", "project": { "id": 3, "url": "http://patchwork.ozlabs.org/api/projects/3/?format=api", "name": "Linux MTD development", "link_name": "linux-mtd", "list_id": "linux-mtd.lists.infradead.org", "list_email": "linux-mtd@lists.infradead.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170920224605.22030-6-ebiggers3@gmail.com>", "list_archive_url": null, "date": "2017-09-20T22:45:45", "name": "[05/25] fscrypt: new helper function - fscrypt_require_key()", "commit_ref": null, "pull_url": null, "state": "not-applicable", "archived": false, "hash": "4023e1bd85b09f993addd710751fb79657328bbd", "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-mtd/patch/20170920224605.22030-6-ebiggers3@gmail.com/mbox/", "series": [ { "id": 4250, "url": "http://patchwork.ozlabs.org/api/series/4250/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-mtd/list/?series=4250", "date": "2017-09-20T22:45:45", "name": "fscrypt: add some higher-level helper functions", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/4250/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/816557/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/816557/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org; 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Ts'o\" <tytso@mit.edu>, Eric Biggers <ebiggers@google.com>, \n\tMichael Halcrow <mhalcrow@google.com>,\n\tlinux-f2fs-devel@lists.sourceforge.net, \n\tlinux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org,\n\tJaegeuk Kim <jaegeuk@kernel.org>, linux-ext4@vger.kernel.org", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=\"us-ascii\"", "Content-Transfer-Encoding": "7bit", "Sender": "\"linux-mtd\" <linux-mtd-bounces@lists.infradead.org>", "Errors-To": "linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org" }, "content": "From: Eric Biggers <ebiggers@google.com>\n\nAdd a helper function which checks if an inode is encrypted, and if so,\ntries to set up its encryption key. This is a pattern which is\nduplicated in multiple places in each of ext4, f2fs, and ubifs --- for\nexample, when a regular file is asked to be opened or truncated.\n\nSigned-off-by: Eric Biggers <ebiggers@google.com>\n---\n include/linux/fscrypt_notsupp.h | 8 ++++++++\n include/linux/fscrypt_supp.h | 28 ++++++++++++++++++++++++++++\n 2 files changed, 36 insertions(+)", "diff": "diff --git a/include/linux/fscrypt_notsupp.h b/include/linux/fscrypt_notsupp.h\nindex 3f1325ec4646..3cfc953fef71 100644\n--- a/include/linux/fscrypt_notsupp.h\n+++ b/include/linux/fscrypt_notsupp.h\n@@ -174,4 +174,12 @@ static inline int fscrypt_zeroout_range(const struct inode *inode, pgoff_t lblk,\n \treturn -EOPNOTSUPP;\n }\n \n+/* hooks.c */\n+static inline int fscrypt_require_key(struct inode *inode)\n+{\n+\tif (IS_ENCRYPTED(inode))\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 32e2fcf13b01..b6d4b5d303a3 100644\n--- a/include/linux/fscrypt_supp.h\n+++ b/include/linux/fscrypt_supp.h\n@@ -142,4 +142,32 @@ extern void fscrypt_pullback_bio_page(struct page **, bool);\n extern int fscrypt_zeroout_range(const struct inode *, pgoff_t, sector_t,\n \t\t\t\t unsigned int);\n \n+/* hooks.c */\n+\n+/**\n+ * fscrypt_require_key - require an inode's encryption key\n+ * @inode: the inode we need the key for\n+ *\n+ * If the inode is encrypted, set up its encryption key if not already done.\n+ * Then require that the key be present and return -ENOKEY otherwise.\n+ *\n+ * No locks are needed, and currently the key will live as long as the struct\n+ * inode --- so it won't go away from under you.\n+ *\n+ * Return: 0 on success, -ENOKEY if the key is missing, or another -errno code\n+ * if a problem occurred while setting up the encryption key.\n+ */\n+static inline int fscrypt_require_key(struct inode *inode)\n+{\n+\tif (IS_ENCRYPTED(inode)) {\n+\t\tint err = fscrypt_get_encryption_info(inode);\n+\n+\t\tif (err)\n+\t\t\treturn err;\n+\t\tif (!fscrypt_has_encryption_key(inode))\n+\t\t\treturn -ENOKEY;\n+\t}\n+\treturn 0;\n+}\n+\n #endif\t/* _LINUX_FSCRYPT_SUPP_H */\n", "prefixes": [ "05/25" ] }