{"id":816557,"url":"http://patchwork.ozlabs.org/api/patches/816557/?format=json","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=json","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=json","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=json","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":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@bilbo.ozlabs.org","Authentication-Results":["ozlabs.org; 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Ts'o\" , Eric Biggers , \n\tMichael Halcrow ,\n\tlinux-f2fs-devel@lists.sourceforge.net, \n\tlinux-mtd@lists.infradead.org, linux-fsdevel@vger.kernel.org,\n\tJaegeuk Kim , linux-ext4@vger.kernel.org","MIME-Version":"1.0","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"linux-mtd\" ","Errors-To":"linux-mtd-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"},"content":"From: Eric Biggers \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 \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"]}